Refactoring code for modular approach

.idea/Letzshop-Import-v2.iml

@@ -4,7 +4,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/venv" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.10 (Letzshop-Import-v2)" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3.10 (Letzshop-Import-v1)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
   <component name="PyDocumentationSettings">

.idea/misc.xml

@@ -3,5 +3,5 @@
   <component name="Black">
     <option name="sdkName" value="Python 3.10 (Letz-backend)" />
   </component>
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.10 (Letzshop-Import-v2)" project-jdk-type="Python SDK" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.10 (Letzshop-Import-v1)" project-jdk-type="Python SDK" />
 </project>

app/api/deps.py

@@ -0,0 +1,40 @@
+from fastapi import Depends, HTTPException
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from models.database_models import User, Shop
+from middleware.auth import AuthManager
+from middleware.rate_limiter import RateLimiter
+
+security = HTTPBearer()
+auth_manager = AuthManager()
+rate_limiter = RateLimiter()
+
+
+def get_current_user(
+        credentials: HTTPAuthorizationCredentials = Depends(security),
+        db: Session = Depends(get_db)
+):
+    """Get current authenticated user"""
+    return auth_manager.get_current_user(db, credentials)
+
+
+def get_current_admin_user(current_user: User = Depends(get_current_user)):
+    """Require admin user"""
+    return auth_manager.require_admin(current_user)
+
+
+def get_user_shop(
+        shop_code: str,
+        current_user: User = Depends(get_current_user),
+        db: Session = Depends(get_db)
+):
+    """Get shop and verify user ownership"""
+    shop = db.query(Shop).filter(Shop.shop_code == shop_code.upper()).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    if current_user.role != "admin" and shop.owner_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Access denied to this shop")
+
+    return shop

app/api/main.py

@@ -0,0 +1,13 @@
+from fastapi import APIRouter
+from app.api.v1 import auth, products, stock, shops, marketplace, admin, stats
+
+api_router = APIRouter()
+
+# Include all route modules
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(products.router, prefix="/products", tags=["products"])
+api_router.include_router(stock.router, prefix="/stock", tags=["stock"])
+api_router.include_router(shops.router, prefix="/shops", tags=["shops"])
+api_router.include_router(marketplace.router, prefix="/marketplace", tags=["marketplace"])
+api_router.include_router(admin.router, prefix="/admin", tags=["admin"])
+api_router.include_router(stats.router, prefix="/stats", tags=["statistics"])

app/api/v1/admin.py

@@ -0,0 +1,153 @@
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from app.tasks.background_tasks import process_marketplace_import
+from middleware.decorators import rate_limit
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest
+from models.database_models import User, MarketplaceImportJob, Shop
+from datetime import datetime
+import logging
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+
+# Admin-only routes
+@router.get("/admin/users", response_model=List[UserResponse])
+def get_all_users(
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Get all users (Admin only)"""
+    users = db.query(User).offset(skip).limit(limit).all()
+    return [UserResponse.model_validate(user) for user in users]
+
+
+@router.put("/admin/users/{user_id}/status")
+def toggle_user_status(
+        user_id: int,
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Toggle user active status (Admin only)"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    if user.id == current_admin.id:
+        raise HTTPException(status_code=400, detail="Cannot deactivate your own account")
+
+    user.is_active = not user.is_active
+    user.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(user)
+
+    status = "activated" if user.is_active else "deactivated"
+    return {"message": f"User {user.username} has been {status}"}
+
+
+@router.get("/admin/shops", response_model=ShopListResponse)
+def get_all_shops_admin(
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Get all shops with admin view (Admin only)"""
+    total = db.query(Shop).count()
+    shops = db.query(Shop).offset(skip).limit(limit).all()
+
+    return ShopListResponse(
+        shops=shops,
+        total=total,
+        skip=skip,
+        limit=limit
+    )
+
+
+@router.put("/admin/shops/{shop_id}/verify")
+def verify_shop(
+        shop_id: int,
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Verify/unverify shop (Admin only)"""
+    shop = db.query(Shop).filter(Shop.id == shop_id).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    shop.is_verified = not shop.is_verified
+    shop.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(shop)
+
+    status = "verified" if shop.is_verified else "unverified"
+    return {"message": f"Shop {shop.shop_code} has been {status}"}
+
+
+@router.put("/admin/shops/{shop_id}/status")
+def toggle_shop_status(
+        shop_id: int,
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Toggle shop active status (Admin only)"""
+    shop = db.query(Shop).filter(Shop.id == shop_id).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    shop.is_active = not shop.is_active
+    shop.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(shop)
+
+    status = "activated" if shop.is_active else "deactivated"
+    return {"message": f"Shop {shop.shop_code} has been {status}"}
+
+
+@router.get("/admin/marketplace-import-jobs", response_model=List[MarketplaceImportJobResponse])
+def get_all_marketplace_import_jobs(
+        marketplace: Optional[str] = Query(None),
+        shop_name: Optional[str] = Query(None),
+        status: Optional[str] = Query(None),
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=100),
+        db: Session = Depends(get_db),
+        current_admin: User = Depends(get_current_admin_user)
+):
+    """Get all marketplace import jobs (Admin only)"""
+
+    query = db.query(MarketplaceImportJob)
+
+    # Apply filters
+    if marketplace:
+        query = query.filter(MarketplaceImportJob.marketplace.ilike(f"%{marketplace}%"))
+    if shop_name:
+        query = query.filter(MarketplaceImportJob.shop_name.ilike(f"%{shop_name}%"))
+    if status:
+        query = query.filter(MarketplaceImportJob.status == status)
+
+    # Order by creation date and apply pagination
+    jobs = query.order_by(MarketplaceImportJob.created_at.desc()).offset(skip).limit(limit).all()
+
+    return [
+        MarketplaceImportJobResponse(
+            job_id=job.id,
+            status=job.status,
+            marketplace=job.marketplace,
+            shop_name=job.shop_name,
+            imported=job.imported_count or 0,
+            updated=job.updated_count or 0,
+            total_processed=job.total_processed or 0,
+            error_count=job.error_count or 0,
+            error_message=job.error_message,
+            created_at=job.created_at,
+            started_at=job.started_at,
+            completed_at=job.completed_at
+        ) for job in jobs
+    ]

app/api/v1/auth.py

@@ -0,0 +1,70 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from models.api_models import UserRegister, UserLogin, UserResponse, LoginResponse
+from models.database_models import User
+from middleware.auth import AuthManager
+import logging
+
+router = APIRouter()
+auth_manager = AuthManager()
+logger = logging.getLogger(__name__)
+
+
+# Authentication Routes
+@router.post("/register", response_model=UserResponse)
+def register_user(user_data: UserRegister, db: Session = Depends(get_db)):
+    """Register a new user"""
+    # Check if email already exists
+    existing_email = db.query(User).filter(User.email == user_data.email).first()
+    if existing_email:
+        raise HTTPException(status_code=400, detail="Email already registered")
+
+    # Check if username already exists
+    existing_username = db.query(User).filter(User.username == user_data.username).first()
+    if existing_username:
+        raise HTTPException(status_code=400, detail="Username already taken")
+
+    # Hash password and create user
+    hashed_password = auth_manager.hash_password(user_data.password)
+    new_user = User(
+        email=user_data.email,
+        username=user_data.username,
+        hashed_password=hashed_password,
+        role="user",
+        is_active=True
+    )
+
+    db.add(new_user)
+    db.commit()
+    db.refresh(new_user)
+
+    logger.info(f"New user registered: {new_user.username}")
+    return new_user
+
+
+@router.post("/login", response_model=LoginResponse)
+def login_user(user_credentials: UserLogin, db: Session = Depends(get_db)):
+    """Login user and return JWT token"""
+    user = auth_manager.authenticate_user(db, user_credentials.username, user_credentials.password)
+    if not user:
+        raise HTTPException(status_code=401, detail="Incorrect username or password")
+
+    # Create access token
+    token_data = auth_manager.create_access_token(user)
+
+    logger.info(f"User logged in: {user.username}")
+
+    return LoginResponse(
+        access_token=token_data["access_token"],
+        token_type=token_data["token_type"],
+        expires_in=token_data["expires_in"],
+        user=UserResponse.model_validate(user)
+    )
+
+
+@router.get("/me", response_model=UserResponse)
+def get_current_user_info(current_user: User = Depends(get_current_user)):
+    """Get current user information"""
+    return UserResponse.model_validate(current_user)

app/api/v1/marketplace.py

@@ -0,0 +1,146 @@
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from app.tasks.background_tasks import process_marketplace_import
+from middleware.decorators import rate_limit
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest
+from models.database_models import User, MarketplaceImportJob, Shop
+from datetime import datetime
+import logging
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+
+# Marketplace Import Routes (Protected)
+@router.post("/import-from-marketplace", response_model=MarketplaceImportJobResponse)
+@rate_limit(max_requests=10, window_seconds=3600)  # Limit marketplace imports
+async def import_products_from_marketplace(
+        request: MarketplaceImportRequest,
+        background_tasks: BackgroundTasks,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Import products from marketplace CSV with background processing (Protected)"""
+
+    logger.info(
+        f"Starting marketplace import: {request.marketplace} -> {request.shop_code} by user {current_user.username}")
+
+    # Verify shop exists and user has access
+    shop = db.query(Shop).filter(Shop.shop_code == request.shop_code).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    # Check permissions: admin can import for any shop, others only for their own
+    if current_user.role != "admin" and shop.owner_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Access denied to this shop")
+
+    # Create marketplace import job record
+    import_job = MarketplaceImportJob(
+        status="pending",
+        source_url=request.url,
+        marketplace=request.marketplace,
+        shop_code=request.shop_code,
+        user_id=current_user.id,
+        created_at=datetime.utcnow()
+    )
+    db.add(import_job)
+    db.commit()
+    db.refresh(import_job)
+
+    # Process in background
+    background_tasks.add_task(
+        process_marketplace_import,
+        import_job.id,
+        request.url,
+        request.marketplace,
+        request.shop_code,
+        request.batch_size or 1000
+    )
+
+    return MarketplaceImportJobResponse(
+        job_id=import_job.id,
+        status="pending",
+        marketplace=request.marketplace,
+        shop_code=request.shop_code,
+        message=f"Marketplace import started from {request.marketplace}. Check status with "
+                f"/marketplace-import-status/{import_job.id}"
+    )
+
+
+@router.get("/marketplace-import-status/{job_id}", response_model=MarketplaceImportJobResponse)
+def get_marketplace_import_status(
+        job_id: int,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get status of marketplace import job (Protected)"""
+    job = db.query(MarketplaceImportJob).filter(MarketplaceImportJob.id == job_id).first()
+    if not job:
+        raise HTTPException(status_code=404, detail="Marketplace import job not found")
+
+    # Users can only see their own jobs, admins can see all
+    if current_user.role != "admin" and job.user_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Access denied to this import job")
+
+    return MarketplaceImportJobResponse(
+        job_id=job.id,
+        status=job.status,
+        marketplace=job.marketplace,
+        shop_name=job.shop_name,
+        imported=job.imported_count or 0,
+        updated=job.updated_count or 0,
+        total_processed=job.total_processed or 0,
+        error_count=job.error_count or 0,
+        error_message=job.error_message,
+        created_at=job.created_at,
+        started_at=job.started_at,
+        completed_at=job.completed_at
+    )
+
+
+@router.get("/marketplace-import-jobs", response_model=List[MarketplaceImportJobResponse])
+def get_marketplace_import_jobs(
+        marketplace: Optional[str] = Query(None, description="Filter by marketplace"),
+        shop_name: Optional[str] = Query(None, description="Filter by shop name"),
+        skip: int = Query(0, ge=0),
+        limit: int = Query(50, ge=1, le=100),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get marketplace import jobs with filtering (Protected)"""
+
+    query = db.query(MarketplaceImportJob)
+
+    # Users can only see their own jobs, admins can see all
+    if current_user.role != "admin":
+        query = query.filter(MarketplaceImportJob.user_id == current_user.id)
+
+    # Apply filters
+    if marketplace:
+        query = query.filter(MarketplaceImportJob.marketplace.ilike(f"%{marketplace}%"))
+    if shop_name:
+        query = query.filter(MarketplaceImportJob.shop_name.ilike(f"%{shop_name}%"))
+
+    # Order by creation date (newest first) and apply pagination
+    jobs = query.order_by(MarketplaceImportJob.created_at.desc()).offset(skip).limit(limit).all()
+
+    return [
+        MarketplaceImportJobResponse(
+            job_id=job.id,
+            status=job.status,
+            marketplace=job.marketplace,
+            shop_name=job.shop_name,
+            imported=job.imported_count or 0,
+            updated=job.updated_count or 0,
+            total_processed=job.total_processed or 0,
+            error_count=job.error_count or 0,
+            error_message=job.error_message,
+            created_at=job.created_at,
+            started_at=job.started_at,
+            completed_at=job.completed_at
+        ) for job in jobs
+    ]

app/api/v1/products.py

@@ -0,0 +1,261 @@
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi.responses import StreamingResponse
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from models.api_models import (ProductListResponse, ProductResponse, ProductCreate, ProductDetailResponse,
+                               StockLocationResponse, StockSummaryResponse, ProductUpdate)
+from models.database_models import User, Product, Stock
+from datetime import datetime
+import logging
+
+from utils.data_processing import GTINProcessor, PriceProcessor
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+# Initialize processors
+gtin_processor = GTINProcessor()
+price_processor = PriceProcessor()
+
+
+# Enhanced Product Routes with Marketplace Support
+@router.get("/products", response_model=ProductListResponse)
+def get_products(
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        brand: Optional[str] = Query(None),
+        category: Optional[str] = Query(None),
+        availability: Optional[str] = Query(None),
+        marketplace: Optional[str] = Query(None, description="Filter by marketplace"),
+        shop_name: Optional[str] = Query(None, description="Filter by shop name"),
+        search: Optional[str] = Query(None),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get products with advanced filtering including marketplace and shop (Protected)"""
+
+    query = db.query(Product)
+
+    # Apply filters
+    if brand:
+        query = query.filter(Product.brand.ilike(f"%{brand}%"))
+    if category:
+        query = query.filter(Product.google_product_category.ilike(f"%{category}%"))
+    if availability:
+        query = query.filter(Product.availability == availability)
+    if marketplace:
+        query = query.filter(Product.marketplace.ilike(f"%{marketplace}%"))
+    if shop_name:
+        query = query.filter(Product.shop_name.ilike(f"%{shop_name}%"))
+    if search:
+        # Search in title, description, and marketplace
+        search_term = f"%{search}%"
+        query = query.filter(
+            (Product.title.ilike(search_term)) |
+            (Product.description.ilike(search_term)) |
+            (Product.marketplace.ilike(search_term)) |
+            (Product.shop_name.ilike(search_term))
+        )
+
+    # Get total count for pagination
+    total = query.count()
+
+    # Apply pagination
+    products = query.offset(skip).limit(limit).all()
+
+    return ProductListResponse(
+        products=products,
+        total=total,
+        skip=skip,
+        limit=limit
+    )
+
+
+@router.post("/products", response_model=ProductResponse)
+def create_product(
+        product: ProductCreate,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Create a new product with validation and marketplace support (Protected)"""
+
+    # Check if product_id already exists
+    existing = db.query(Product).filter(Product.product_id == product.product_id).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="Product with this ID already exists")
+
+    # Process and validate GTIN if provided
+    if product.gtin:
+        normalized_gtin = gtin_processor.normalize(product.gtin)
+        if not normalized_gtin:
+            raise HTTPException(status_code=400, detail="Invalid GTIN format")
+        product.gtin = normalized_gtin
+
+    # Process price if provided
+    if product.price:
+        parsed_price, currency = price_processor.parse_price_currency(product.price)
+        if parsed_price:
+            product.price = parsed_price
+            product.currency = currency
+
+    # Set default marketplace if not provided
+    if not product.marketplace:
+        product.marketplace = "Letzshop"
+
+    db_product = Product(**product.dict())
+    db.add(db_product)
+    db.commit()
+    db.refresh(db_product)
+
+    logger.info(
+        f"Created product {db_product.product_id} for marketplace {db_product.marketplace}, "
+        f"shop {db_product.shop_name}")
+    return db_product
+
+
+@router.get("/products/{product_id}", response_model=ProductDetailResponse)
+def get_product(product_id: str, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get product with stock information (Protected)"""
+
+    product = db.query(Product).filter(Product.product_id == product_id).first()
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+
+    # Get stock information if GTIN exists
+    stock_info = None
+    if product.gtin:
+        stock_entries = db.query(Stock).filter(Stock.gtin == product.gtin).all()
+        if stock_entries:
+            total_quantity = sum(entry.quantity for entry in stock_entries)
+            locations = [
+                StockLocationResponse(location=entry.location, quantity=entry.quantity)
+                for entry in stock_entries
+            ]
+            stock_info = StockSummaryResponse(
+                gtin=product.gtin,
+                total_quantity=total_quantity,
+                locations=locations
+            )
+
+    return ProductDetailResponse(
+        product=product,
+        stock_info=stock_info
+    )
+
+
+@router.put("/products/{product_id}", response_model=ProductResponse)
+def update_product(
+        product_id: str,
+        product_update: ProductUpdate,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Update product with validation and marketplace support (Protected)"""
+
+    product = db.query(Product).filter(Product.product_id == product_id).first()
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+
+    # Update fields
+    update_data = product_update.dict(exclude_unset=True)
+
+    # Validate GTIN if being updated
+    if "gtin" in update_data and update_data["gtin"]:
+        normalized_gtin = gtin_processor.normalize(update_data["gtin"])
+        if not normalized_gtin:
+            raise HTTPException(status_code=400, detail="Invalid GTIN format")
+        update_data["gtin"] = normalized_gtin
+
+    # Process price if being updated
+    if "price" in update_data and update_data["price"]:
+        parsed_price, currency = price_processor.parse_price_currency(update_data["price"])
+        if parsed_price:
+            update_data["price"] = parsed_price
+            update_data["currency"] = currency
+
+    for key, value in update_data.items():
+        setattr(product, key, value)
+
+    product.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(product)
+
+    return product
+
+
+@router.delete("/products/{product_id}")
+def delete_product(
+        product_id: str,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Delete product and associated stock (Protected)"""
+
+    product = db.query(Product).filter(Product.product_id == product_id).first()
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found")
+
+    # Delete associated stock entries if GTIN exists
+    if product.gtin:
+        db.query(Stock).filter(Stock.gtin == product.gtin).delete()
+
+    db.delete(product)
+    db.commit()
+
+    return {"message": "Product and associated stock deleted successfully"}
+
+# Export with streaming for large datasets (Protected)
+@router.get("/export-csv")
+async def export_csv(
+        marketplace: Optional[str] = Query(None, description="Filter by marketplace"),
+        shop_name: Optional[str] = Query(None, description="Filter by shop name"),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Export products as CSV with streaming and marketplace filtering (Protected)"""
+
+    def generate_csv():
+        # Stream CSV generation for memory efficiency
+        yield "product_id,title,description,link,image_link,availability,price,currency,brand,gtin,marketplace,shop_name\n"
+
+        batch_size = 1000
+        offset = 0
+
+        while True:
+            query = db.query(Product)
+
+            # Apply marketplace filters
+            if marketplace:
+                query = query.filter(Product.marketplace.ilike(f"%{marketplace}%"))
+            if shop_name:
+                query = query.filter(Product.shop_name.ilike(f"%{shop_name}%"))
+
+            products = query.offset(offset).limit(batch_size).all()
+            if not products:
+                break
+
+            for product in products:
+                # Create CSV row with marketplace fields
+                row = (f'"{product.product_id}","{product.title or ""}","{product.description or ""}",'
+                       f'"{product.link or ""}","{product.image_link or ""}","{product.availability or ""}",'
+                       f'"{product.price or ""}","{product.currency or ""}","{product.brand or ""}",'
+                       f'"{product.gtin or ""}","{product.marketplace or ""}","{product.shop_name or ""}"\n')
+                yield row
+
+            offset += batch_size
+
+    filename = "products_export"
+    if marketplace:
+        filename += f"_{marketplace}"
+    if shop_name:
+        filename += f"_{shop_name}"
+    filename += ".csv"
+
+    return StreamingResponse(
+        generate_csv(),
+        media_type="text/csv",
+        headers={"Content-Disposition": f"attachment; filename={filename}"}
+    )

app/api/v1/shops.py

@@ -0,0 +1,188 @@
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from app.tasks.background_tasks import process_marketplace_import
+from middleware.decorators import rate_limit
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest
+from models.database_models import User, MarketplaceImportJob, Shop
+from datetime import datetime
+import logging
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+
+# Shop Management Routes
+@router.post("/shops", response_model=ShopResponse)
+def create_shop(
+        shop_data: ShopCreate,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Create a new shop (Protected)"""
+    # Check if shop code already exists
+    existing_shop = db.query(Shop).filter(Shop.shop_code == shop_data.shop_code).first()
+    if existing_shop:
+        raise HTTPException(status_code=400, detail="Shop code already exists")
+
+    # Create shop
+    new_shop = Shop(
+        **shop_data.dict(),
+        owner_id=current_user.id,
+        is_active=True,
+        is_verified=(current_user.role == "admin")  # Auto-verify if admin creates shop
+    )
+
+    db.add(new_shop)
+    db.commit()
+    db.refresh(new_shop)
+
+    logger.info(f"New shop created: {new_shop.shop_code} by {current_user.username}")
+    return new_shop
+
+
+@router.get("/shops", response_model=ShopListResponse)
+def get_shops(
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        active_only: bool = Query(True),
+        verified_only: bool = Query(False),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get shops with filtering (Protected)"""
+    query = db.query(Shop)
+
+    # Non-admin users can only see active and verified shops, plus their own
+    if current_user.role != "admin":
+        query = query.filter(
+            (Shop.is_active == True) &
+            ((Shop.is_verified == True) | (Shop.owner_id == current_user.id))
+        )
+    else:
+        # Admin can apply filters
+        if active_only:
+            query = query.filter(Shop.is_active == True)
+        if verified_only:
+            query = query.filter(Shop.is_verified == True)
+
+    total = query.count()
+    shops = query.offset(skip).limit(limit).all()
+
+    return ShopListResponse(
+        shops=shops,
+        total=total,
+        skip=skip,
+        limit=limit
+    )
+
+
+@router.get("/shops/{shop_code}", response_model=ShopResponse)
+def get_shop(shop_code: str, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get shop details (Protected)"""
+    shop = db.query(Shop).filter(Shop.shop_code == shop_code.upper()).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    # Non-admin users can only see active verified shops or their own shops
+    if current_user.role != "admin":
+        if not shop.is_active or (not shop.is_verified and shop.owner_id != current_user.id):
+            raise HTTPException(status_code=404, detail="Shop not found")
+
+    return shop
+
+
+# Shop Product Management
+@router.post("/shops/{shop_code}/products", response_model=ShopProductResponse)
+def add_product_to_shop(
+        shop_code: str,
+        shop_product: ShopProductCreate,
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Add existing product to shop catalog with shop-specific settings (Protected)"""
+
+    # Get and verify shop
+    shop = get_user_shop(shop_code, current_user, db)
+
+    # Check if product exists
+    product = db.query(Product).filter(Product.product_id == shop_product.product_id).first()
+    if not product:
+        raise HTTPException(status_code=404, detail="Product not found in marketplace catalog")
+
+    # Check if product already in shop
+    existing_shop_product = db.query(ShopProduct).filter(
+        ShopProduct.shop_id == shop.id,
+        ShopProduct.product_id == product.id
+    ).first()
+
+    if existing_shop_product:
+        raise HTTPException(status_code=400, detail="Product already in shop catalog")
+
+    # Create shop-product association
+    new_shop_product = ShopProduct(
+        shop_id=shop.id,
+        product_id=product.id,
+        **shop_product.dict(exclude={'product_id'})
+    )
+
+    db.add(new_shop_product)
+    db.commit()
+    db.refresh(new_shop_product)
+
+    # Return with product details
+    response = ShopProductResponse.model_validate(new_shop_product)
+    response.product = product
+    return response
+
+
+@router.get("/shops/{shop_code}/products")
+def get_shop_products(
+        shop_code: str,
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        active_only: bool = Query(True),
+        featured_only: bool = Query(False),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get products in shop catalog (Protected)"""
+
+    # Get shop (public can view active/verified shops)
+    shop = db.query(Shop).filter(Shop.shop_code == shop_code.upper()).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    # Non-owners can only see active verified shops
+    if current_user.role != "admin" and shop.owner_id != current_user.id:
+        if not shop.is_active or not shop.is_verified:
+            raise HTTPException(status_code=404, detail="Shop not found")
+
+    # Query shop products
+    query = db.query(ShopProduct).filter(ShopProduct.shop_id == shop.id)
+
+    if active_only:
+        query = query.filter(ShopProduct.is_active == True)
+    if featured_only:
+        query = query.filter(ShopProduct.is_featured == True)
+
+    total = query.count()
+    shop_products = query.offset(skip).limit(limit).all()
+
+    # Format response
+    products = []
+    for sp in shop_products:
+        product_response = ShopProductResponse.model_validate(sp)
+        product_response.product = sp.product
+        products.append(product_response)
+
+    return {
+        "products": products,
+        "total": total,
+        "skip": skip,
+        "limit": limit,
+        "shop": ShopResponse.model_validate(shop)
+    }

app/api/v1/stats.py

@@ -0,0 +1,84 @@
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from app.tasks.background_tasks import process_marketplace_import
+from middleware.decorators import rate_limit
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest
+from models.database_models import User, MarketplaceImportJob, Shop
+from datetime import datetime
+import logging
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+
+# Enhanced Statistics with Marketplace Support
+@router.get("/stats", response_model=StatsResponse)
+def get_stats(db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get comprehensive statistics with marketplace data (Protected)"""
+
+    # Use more efficient queries with proper indexes
+    total_products = db.query(Product).count()
+
+    unique_brands = db.query(Product.brand).filter(
+        Product.brand.isnot(None),
+        Product.brand != ""
+    ).distinct().count()
+
+    unique_categories = db.query(Product.google_product_category).filter(
+        Product.google_product_category.isnot(None),
+        Product.google_product_category != ""
+    ).distinct().count()
+
+    # New marketplace statistics
+    unique_marketplaces = db.query(Product.marketplace).filter(
+        Product.marketplace.isnot(None),
+        Product.marketplace != ""
+    ).distinct().count()
+
+    unique_shops = db.query(Product.shop_name).filter(
+        Product.shop_name.isnot(None),
+        Product.shop_name != ""
+    ).distinct().count()
+
+    # Stock statistics
+    total_stock_entries = db.query(Stock).count()
+    total_inventory = db.query(func.sum(Stock.quantity)).scalar() or 0
+
+    return StatsResponse(
+        total_products=total_products,
+        unique_brands=unique_brands,
+        unique_categories=unique_categories,
+        unique_marketplaces=unique_marketplaces,
+        unique_shops=unique_shops,
+        total_stock_entries=total_stock_entries,
+        total_inventory_quantity=total_inventory
+    )
+
+
+@router.get("/marketplace-stats", response_model=List[MarketplaceStatsResponse])
+def get_marketplace_stats(db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get statistics broken down by marketplace (Protected)"""
+
+    # Query to get stats per marketplace
+    marketplace_stats = db.query(
+        Product.marketplace,
+        func.count(Product.id).label('total_products'),
+        func.count(func.distinct(Product.shop_name)).label('unique_shops'),
+        func.count(func.distinct(Product.brand)).label('unique_brands')
+    ).filter(
+        Product.marketplace.isnot(None)
+    ).group_by(Product.marketplace).all()
+
+    return [
+        MarketplaceStatsResponse(
+            marketplace=stat.marketplace,
+            total_products=stat.total_products,
+            unique_shops=stat.unique_shops,
+            unique_brands=stat.unique_brands
+        ) for stat in marketplace_stats
+    ]
+

app/api/v1/stock.py

@@ -0,0 +1,315 @@
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from app.api.deps import get_current_user
+from app.tasks.background_tasks import process_marketplace_import
+from middleware.decorators import rate_limit
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest, StockResponse, \
+    StockSummaryResponse
+from models.database_models import User, MarketplaceImportJob, Shop
+from datetime import datetime
+import logging
+
+router = APIRouter()
+logger = logging.getLogger(__name__)
+
+
+# Stock Management Routes (Protected)
+
+@router.post("/stock", response_model=StockResponse)
+def set_stock(stock: StockCreate, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Set exact stock quantity for a GTIN at a specific location (replaces existing quantity)"""
+
+    # Normalize GTIN
+    def normalize_gtin(gtin_value):
+        if not gtin_value:
+            return None
+        gtin_str = str(gtin_value).strip()
+        if '.' in gtin_str:
+            gtin_str = gtin_str.split('.')[0]
+        gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+        if len(gtin_clean) in [8, 12, 13, 14]:
+            return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+        return gtin_clean if gtin_clean else None
+
+    normalized_gtin = normalize_gtin(stock.gtin)
+    if not normalized_gtin:
+        raise HTTPException(status_code=400, detail="Invalid GTIN format")
+
+    # Check if stock entry already exists for this GTIN and location
+    existing_stock = db.query(Stock).filter(
+        Stock.gtin == normalized_gtin,
+        Stock.location == stock.location.strip().upper()
+    ).first()
+
+    if existing_stock:
+        # Update existing stock (SET to exact quantity)
+        old_quantity = existing_stock.quantity
+        existing_stock.quantity = stock.quantity
+        existing_stock.updated_at = datetime.utcnow()
+        db.commit()
+        db.refresh(existing_stock)
+        logger.info(f"Updated stock for GTIN {normalized_gtin} at {stock.location}: {old_quantity} → {stock.quantity}")
+        return existing_stock
+    else:
+        # Create new stock entry
+        new_stock = Stock(
+            gtin=normalized_gtin,
+            location=stock.location.strip().upper(),
+            quantity=stock.quantity
+        )
+        db.add(new_stock)
+        db.commit()
+        db.refresh(new_stock)
+        logger.info(f"Created new stock for GTIN {normalized_gtin} at {stock.location}: {stock.quantity}")
+        return new_stock
+
+
+@router.post("/stock/add", response_model=StockResponse)
+def add_stock(stock: StockAdd, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Add quantity to existing stock for a GTIN at a specific location (adds to existing quantity)"""
+
+    # Normalize GTIN
+    def normalize_gtin(gtin_value):
+        if not gtin_value:
+            return None
+        gtin_str = str(gtin_value).strip()
+        if '.' in gtin_str:
+            gtin_str = gtin_str.split('.')[0]
+        gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+        if len(gtin_clean) in [8, 12, 13, 14]:
+            return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+        return gtin_clean if gtin_clean else None
+
+    normalized_gtin = normalize_gtin(stock.gtin)
+    if not normalized_gtin:
+        raise HTTPException(status_code=400, detail="Invalid GTIN format")
+
+    # Check if stock entry already exists for this GTIN and location
+    existing_stock = db.query(Stock).filter(
+        Stock.gtin == normalized_gtin,
+        Stock.location == stock.location.strip().upper()
+    ).first()
+
+    if existing_stock:
+        # Add to existing stock
+        old_quantity = existing_stock.quantity
+        existing_stock.quantity += stock.quantity
+        existing_stock.updated_at = datetime.utcnow()
+        db.commit()
+        db.refresh(existing_stock)
+        logger.info(
+            f"Added stock for GTIN {normalized_gtin} at {stock.location}: {old_quantity} + {stock.quantity} = {existing_stock.quantity}")
+        return existing_stock
+    else:
+        # Create new stock entry with the quantity
+        new_stock = Stock(
+            gtin=normalized_gtin,
+            location=stock.location.strip().upper(),
+            quantity=stock.quantity
+        )
+        db.add(new_stock)
+        db.commit()
+        db.refresh(new_stock)
+        logger.info(f"Created new stock for GTIN {normalized_gtin} at {stock.location}: {stock.quantity}")
+        return new_stock
+
+
+@router.post("/stock/remove", response_model=StockResponse)
+def remove_stock(stock: StockAdd, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Remove quantity from existing stock for a GTIN at a specific location"""
+
+    # Normalize GTIN
+    def normalize_gtin(gtin_value):
+        if not gtin_value:
+            return None
+        gtin_str = str(gtin_value).strip()
+        if '.' in gtin_str:
+            gtin_str = gtin_str.split('.')[0]
+        gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+        if len(gtin_clean) in [8, 12, 13, 14]:
+            return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+        return gtin_clean if gtin_clean else None
+
+    normalized_gtin = normalize_gtin(stock.gtin)
+    if not normalized_gtin:
+        raise HTTPException(status_code=400, detail="Invalid GTIN format")
+
+    # Find existing stock entry
+    existing_stock = db.query(Stock).filter(
+        Stock.gtin == normalized_gtin,
+        Stock.location == stock.location.strip().upper()
+    ).first()
+
+    if not existing_stock:
+        raise HTTPException(
+            status_code=404,
+            detail=f"No stock found for GTIN {normalized_gtin} at location {stock.location}"
+        )
+
+    # Check if we have enough stock to remove
+    if existing_stock.quantity < stock.quantity:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Insufficient stock. Available: {existing_stock.quantity}, Requested to remove: {stock.quantity}"
+        )
+
+    # Remove from existing stock
+    old_quantity = existing_stock.quantity
+    existing_stock.quantity -= stock.quantity
+    existing_stock.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(existing_stock)
+    logger.info(
+        f"Removed stock for GTIN {normalized_gtin} at {stock.location}: {old_quantity} - {stock.quantity} = {existing_stock.quantity}")
+    return existing_stock
+
+
+@router.get("/stock/{gtin}", response_model=StockSummaryResponse)
+def get_stock_by_gtin(gtin: str, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get all stock locations and total quantity for a specific GTIN"""
+
+    # Normalize GTIN
+    def normalize_gtin(gtin_value):
+        if not gtin_value:
+            return None
+        gtin_str = str(gtin_value).strip()
+        if '.' in gtin_str:
+            gtin_str = gtin_str.split('.')[0]
+        gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+        if len(gtin_clean) in [8, 12, 13, 14]:
+            return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+        return gtin_clean if gtin_clean else None
+
+    normalized_gtin = normalize_gtin(gtin)
+    if not normalized_gtin:
+        raise HTTPException(status_code=400, detail="Invalid GTIN format")
+
+    # Get all stock entries for this GTIN
+    stock_entries = db.query(Stock).filter(Stock.gtin == normalized_gtin).all()
+
+    if not stock_entries:
+        raise HTTPException(status_code=404, detail=f"No stock found for GTIN: {gtin}")
+
+    # Calculate total quantity and build locations list
+    total_quantity = 0
+    locations = []
+
+    for entry in stock_entries:
+        total_quantity += entry.quantity
+        locations.append(StockLocationResponse(
+            location=entry.location,
+            quantity=entry.quantity
+        ))
+
+    # Try to get product title for reference
+    product = db.query(Product).filter(Product.gtin == normalized_gtin).first()
+    product_title = product.title if product else None
+
+    return StockSummaryResponse(
+        gtin=normalized_gtin,
+        total_quantity=total_quantity,
+        locations=locations,
+        product_title=product_title
+    )
+
+
+@router.get("/stock/{gtin}/total")
+def get_total_stock(gtin: str, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Get total quantity in stock for a specific GTIN"""
+
+    # Normalize GTIN
+    def normalize_gtin(gtin_value):
+        if not gtin_value:
+            return None
+        gtin_str = str(gtin_value).strip()
+        if '.' in gtin_str:
+            gtin_str = gtin_str.split('.')[0]
+        gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+        if len(gtin_clean) in [8, 12, 13, 14]:
+            return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+        return gtin_clean if gtin_clean else None
+
+    normalized_gtin = normalize_gtin(gtin)
+    if not normalized_gtin:
+        raise HTTPException(status_code=400, detail="Invalid GTIN format")
+
+    # Calculate total stock
+    total_stock = db.query(Stock).filter(Stock.gtin == normalized_gtin).all()
+    total_quantity = sum(entry.quantity for entry in total_stock)
+
+    # Get product info for context
+    product = db.query(Product).filter(Product.gtin == normalized_gtin).first()
+
+    return {
+        "gtin": normalized_gtin,
+        "total_quantity": total_quantity,
+        "product_title": product.title if product else None,
+        "locations_count": len(total_stock)
+    }
+
+
+@router.get("/stock", response_model=List[StockResponse])
+def get_all_stock(
+        skip: int = Query(0, ge=0),
+        limit: int = Query(100, ge=1, le=1000),
+        location: Optional[str] = Query(None, description="Filter by location"),
+        gtin: Optional[str] = Query(None, description="Filter by GTIN"),
+        db: Session = Depends(get_db),
+        current_user: User = Depends(get_current_user)
+):
+    """Get all stock entries with optional filtering"""
+    query = db.query(Stock)
+
+    if location:
+        query = query.filter(Stock.location.ilike(f"%{location}%"))
+
+    if gtin:
+        # Normalize GTIN for search
+        def normalize_gtin(gtin_value):
+            if not gtin_value:
+                return None
+            gtin_str = str(gtin_value).strip()
+            if '.' in gtin_str:
+                gtin_str = gtin_str.split('.')[0]
+            gtin_clean = ''.join(filter(str.isdigit, gtin_str))
+            if len(gtin_clean) in [8, 12, 13, 14]:
+                return gtin_clean.zfill(13) if len(gtin_clean) == 13 else gtin_clean.zfill(12)
+            return gtin_clean if gtin_clean else None
+
+        normalized_gtin = normalize_gtin(gtin)
+        if normalized_gtin:
+            query = query.filter(Stock.gtin == normalized_gtin)
+
+    stock_entries = query.offset(skip).limit(limit).all()
+    return stock_entries
+
+
+@router.put("/stock/{stock_id}", response_model=StockResponse)
+def update_stock(stock_id: int, stock_update: StockUpdate, db: Session = Depends(get_db),
+                 current_user: User = Depends(get_current_user)):
+    """Update stock quantity for a specific stock entry"""
+    stock_entry = db.query(Stock).filter(Stock.id == stock_id).first()
+    if not stock_entry:
+        raise HTTPException(status_code=404, detail="Stock entry not found")
+
+    stock_entry.quantity = stock_update.quantity
+    stock_entry.updated_at = datetime.utcnow()
+    db.commit()
+    db.refresh(stock_entry)
+    return stock_entry
+
+
+@router.delete("/stock/{stock_id}")
+def delete_stock(stock_id: int, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
+    """Delete a stock entry"""
+    stock_entry = db.query(Stock).filter(Stock.id == stock_id).first()
+    if not stock_entry:
+        raise HTTPException(status_code=404, detail="Stock entry not found")
+
+    db.delete(stock_entry)
+    db.commit()
+    return {"message": "Stock entry deleted successfully"}
+

app/core/config.py

@@ -0,0 +1,26 @@
+from pydantic_settings import BaseSettings
+from typing import List
+import os
+
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "Ecommerce Backend API with Marketplace Support"
+    DESCRIPTION: str = "Advanced product management system with JWT authentication"
+    VERSION: str = "2.2.0"
+
+    DATABASE_URL: str = os.getenv("DATABASE_URL", "postgresql://user:password@localhost/ecommerce")
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "your-secret-key-change-in-production")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    ALLOWED_HOSTS: List[str] = ["*"]  # Configure for production
+
+    # Rate limiting
+    RATE_LIMIT_REQUESTS: int = 100
+    RATE_LIMIT_WINDOW: int = 3600
+
+    class Config:
+        env_file = ".env"
+        extra = "ignore"
+
+
+settings = Settings()

app/core/database.py

@@ -0,0 +1,21 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, Session
+from .config import settings
+
+engine = create_engine(settings.DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+# Database dependency with connection pooling
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    except Exception as e:
+        db.rollback()
+        raise
+    finally:
+        db.close()

app/core/lifespan.py

@@ -0,0 +1,48 @@
+from contextlib import asynccontextmanager
+from fastapi import FastAPI
+from sqlalchemy import text
+from .logging import setup_logging
+from .database import engine
+from models.database_models import Base
+import logging
+
+logger = logging.getLogger(__name__)
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Application lifespan events"""
+    # Startup
+    logger = setup_logging()  # Configure logging first
+    logger.info("Starting up ecommerce API")
+
+    # Create tables
+    Base.metadata.create_all(bind=engine)
+
+    # Create indexes
+    create_indexes()
+
+    yield
+
+    # Shutdown
+    logger.info("Shutting down ecommerce API")
+
+
+def create_indexes():
+    """Create database indexes"""
+    with engine.connect() as conn:
+        try:
+            # User indexes
+            conn.execute(text("CREATE INDEX IF NOT EXISTS idx_user_email ON users(email)"))
+            conn.execute(text("CREATE INDEX IF NOT EXISTS idx_user_username ON users(username)"))
+
+            # Product indexes
+            conn.execute(text("CREATE INDEX IF NOT EXISTS idx_product_gtin ON products(gtin)"))
+            conn.execute(text("CREATE INDEX IF NOT EXISTS idx_product_marketplace ON products(marketplace)"))
+
+            # Stock indexes
+            conn.execute(text("CREATE INDEX IF NOT EXISTS idx_stock_gtin_location ON stock(gtin, location)"))
+
+            conn.commit()
+            logger.info("Database indexes created successfully")
+        except Exception as e:
+            logger.warning(f"Index creation warning: {e}")

app/core/logging.py

@@ -0,0 +1,42 @@
+# app/core/logging.py
+import logging
+import sys
+from pathlib import Path
+from app.core.config import settings
+
+
+def setup_logging():
+    """Configure application logging with file and console handlers"""
+
+    # Create logs directory if it doesn't exist
+    log_file = Path(settings.LOG_FILE)
+    log_file.parent.mkdir(parents=True, exist_ok=True)
+
+    # Configure root logger
+    logger = logging.getLogger()
+    logger.setLevel(getattr(logging, settings.LOG_LEVEL.upper()))
+
+    # Remove existing handlers
+    for handler in logger.handlers[:]:
+        logger.removeHandler(handler)
+
+    # Create formatters
+    formatter = logging.Formatter(
+        '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+    )
+
+    # Console handler
+    console_handler = logging.StreamHandler(sys.stdout)
+    console_handler.setFormatter(formatter)
+    logger.addHandler(console_handler)
+
+    # File handler
+    file_handler = logging.FileHandler(log_file)
+    file_handler.setFormatter(formatter)
+    logger.addHandler(file_handler)
+
+    # Configure specific loggers
+    logging.getLogger("uvicorn.access").setLevel(logging.WARNING)
+    logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
+
+    return logging.getLogger(__name__)

app/services/product_service.py

@@ -0,0 +1,79 @@
+from sqlalchemy.orm import Session
+from models.database_models import Product
+from models.api_models import ProductCreate
+from utils.data_processing import GTINProcessor, PriceProcessor
+from typing import Optional, List
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class ProductService:
+    def __init__(self):
+        self.gtin_processor = GTINProcessor()
+        self.price_processor = PriceProcessor()
+
+    def create_product(self, db: Session, product_data: ProductCreate) -> Product:
+        """Create a new product with validation"""
+        # Process and validate GTIN if provided
+        if product_data.gtin:
+            normalized_gtin = self.gtin_processor.normalize(product_data.gtin)
+            if not normalized_gtin:
+                raise ValueError("Invalid GTIN format")
+            product_data.gtin = normalized_gtin
+
+        # Process price if provided
+        if product_data.price:
+            parsed_price, currency = self.price_processor.parse_price_currency(product_data.price)
+            if parsed_price:
+                product_data.price = parsed_price
+                product_data.currency = currency
+
+        # Set default marketplace if not provided
+        if not product_data.marketplace:
+            product_data.marketplace = "Letzshop"
+
+        db_product = Product(**product_data.dict())
+        db.add(db_product)
+        db.commit()
+        db.refresh(db_product)
+
+        logger.info(f"Created product {db_product.product_id}")
+        return db_product
+
+    def get_products_with_filters(
+            self,
+            db: Session,
+            skip: int = 0,
+            limit: int = 100,
+            brand: Optional[str] = None,
+            category: Optional[str] = None,
+            marketplace: Optional[str] = None,
+            search: Optional[str] = None
+    ) -> tuple[List[Product], int]:
+        """Get products with filtering and pagination"""
+        query = db.query(Product)
+
+        # Apply filters
+        if brand:
+            query = query.filter(Product.brand.ilike(f"%{brand}%"))
+        if category:
+            query = query.filter(Product.google_product_category.ilike(f"%{category}%"))
+        if marketplace:
+            query = query.filter(Product.marketplace.ilike(f"%{marketplace}%"))
+        if search:
+            search_term = f"%{search}%"
+            query = query.filter(
+                (Product.title.ilike(search_term)) |
+                (Product.description.ilike(search_term)) |
+                (Product.marketplace.ilike(search_term))
+            )
+
+        total = query.count()
+        products = query.offset(skip).limit(limit).all()
+
+        return products, total
+
+
+# Create service instance
+product_service = ProductService()

app/tasks/background_tasks.py

@@ -0,0 +1,63 @@
+from sqlalchemy.orm import Session
+from app.core.database import SessionLocal
+from models.database_models import MarketplaceImportJob
+from utils.csv_processor import CSVProcessor
+from datetime import datetime
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+async def process_marketplace_import(
+        job_id: int,
+        url: str,
+        marketplace: str,
+        shop_name: str,
+        batch_size: int = 1000
+):
+    """Background task to process marketplace CSV import"""
+    db = SessionLocal()
+    csv_processor = CSVProcessor()
+
+    try:
+        # Update job status
+        job = db.query(MarketplaceImportJob).filter(MarketplaceImportJob.id == job_id).first()
+        if not job:
+            logger.error(f"Import job {job_id} not found")
+            return
+
+        job.status = "processing"
+        job.started_at = datetime.utcnow()
+        db.commit()
+
+        logger.info(f"Processing import: Job {job_id}, Marketplace: {marketplace}")
+
+        # Process CSV
+        result = await csv_processor.process_marketplace_csv_from_url(
+            url, marketplace, shop_name, batch_size, db
+        )
+
+        # Update job with results
+        job.status = "completed"
+        job.completed_at = datetime.utcnow()
+        job.imported_count = result["imported"]
+        job.updated_count = result["updated"]
+        job.error_count = result.get("errors", 0)
+        job.total_processed = result["total_processed"]
+
+        if result.get("errors", 0) > 0:
+            job.status = "completed_with_errors"
+            job.error_message = f"{result['errors']} rows had errors"
+
+        db.commit()
+        logger.info(f"Import job {job_id} completed successfully")
+
+    except Exception as e:
+        logger.error(f"Import job {job_id} failed: {e}")
+        job.status = "failed"
+        job.completed_at = datetime.utcnow()
+        job.error_message = str(e)
+        db.commit()
+
+    finally:
+        db.close()

comprehensive_readme.md

@@ -0,0 +1,493 @@
+# Ecommerce Backend API with Marketplace Support
+
+A comprehensive FastAPI-based product management system with JWT authentication, marketplace-aware CSV import/export, multi-shop support, and advanced stock management capabilities.
+
+## Features
+
+- **JWT Authentication** - Secure user registration, login, and role-based access control
+- **Marketplace Integration** - Support for multiple marketplaces (Letzshop, Amazon, eBay, Etsy, Shopify, etc.)
+- **Multi-Shop Management** - Shop creation, ownership validation, and product catalog management
+- **Advanced Product Management** - GTIN validation, price processing, and comprehensive filtering
+- **Stock Management** - Multi-location inventory tracking with add/remove/set operations
+- **CSV Import/Export** - Background processing of marketplace CSV files with progress tracking
+- **Rate Limiting** - Built-in request rate limiting for API protection
+- **Admin Panel** - Administrative functions for user and shop management
+- **Statistics & Analytics** - Comprehensive reporting on products, marketplaces, and inventory
+
+## Technology Stack
+
+- **FastAPI** - Modern, fast web framework for building APIs
+- **SQLAlchemy** - SQL toolkit and Object-Relational Mapping (ORM)
+- **PostgreSQL** - Primary database (SQLite supported for development)
+- **JWT** - JSON Web Tokens for secure authentication
+- **Pydantic** - Data validation using Python type annotations
+- **Pandas** - Data processing for CSV operations
+- **bcrypt** - Password hashing
+- **Pytest** - Comprehensive testing framework
+
+## Directory Structure
+
+```
+letzshop_api/
+├── main.py                     # FastAPI application entry point
+├── app/
+│   ├── core/
+│   │   ├── config.py           # Configuration settings
+│   │   ├── database.py         # Database setup
+│   │   └── lifespan.py         # App lifecycle management
+│   ├── api/
+│   │   ├── deps.py             # Common dependencies
+│   │   ├── main.py             # API router setup
+│   │   └── v1/                 # API version 1 routes
+│   │       ├── auth.py         # Authentication endpoints
+│   │       ├── products.py     # Product management
+│   │       ├── stock.py        # Stock operations
+│   │       ├── shops.py        # Shop management
+│   │       ├── marketplace.py  # Marketplace imports
+│   │       ├── admin.py        # Admin functions
+│   │       └── stats.py        # Statistics
+│   ├── services/               # Business logic layer
+│   └── tasks/                  # Background task processing
+├── models/
+│   ├── database_models.py      # SQLAlchemy ORM models
+│   └── api_models.py          # Pydantic API models
+├── utils/
+│   ├── data_processing.py     # GTIN and price processing
+│   ├── csv_processor.py       # CSV import/export
+│   └── database.py           # Database utilities
+├── middleware/
+│   ├── auth.py               # JWT authentication
+│   ├── rate_limiter.py       # Rate limiting
+│   ├── error_handler.py      # Error handling
+│   └── logging_middleware.py # Request logging
+├── tests/                    # Comprehensive test suite
+└── requirements.txt          # Dependencies
+```
+
+## Quick Start
+
+### 1. Installation
+
+```bash
+# Clone the repository
+git clone <repository-url>
+cd letzshop_api
+
+# Create virtual environment
+python -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+
+# Install dependencies
+pip install -r requirements.txt
+```
+
+### 2. Environment Configuration
+
+Create a `.env` file in the project root:
+
+```env
+# Database Configuration
+DATABASE_URL=postgresql://user:password@localhost/ecommerce
+# For development, you can use SQLite:
+# DATABASE_URL=sqlite:///./ecommerce.db
+
+# JWT Configuration
+SECRET_KEY=your-super-secret-key-change-in-production
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# API Configuration
+ALLOWED_HOSTS=["*"]
+RATE_LIMIT_REQUESTS=100
+RATE_LIMIT_WINDOW=3600
+
+# Application Settings
+PROJECT_NAME="Ecommerce Backend API"
+VERSION="2.2.0"
+DEBUG=True
+```
+
+### 3. Database Setup
+
+```bash
+# The application will automatically create tables on startup
+# For production, consider using Alembic for migrations
+
+# Install PostgreSQL (if using PostgreSQL)
+# Create database
+createdb ecommerce
+
+# Run the application (tables will be created automatically)
+python main.py
+```
+
+### 4. Running the Application
+
+```bash
+# Development server
+python main.py
+
+# Or using uvicorn directly
+uvicorn main:app --reload --host 0.0.0.0 --port 8000
+```
+
+The API will be available at:
+- **API Documentation**: http://localhost:8000/docs (Swagger UI)
+- **Alternative Docs**: http://localhost:8000/redoc
+- **Health Check**: http://localhost:8000/health
+
+## API Usage
+
+### Authentication
+
+#### Register a new user
+```bash
+curl -X POST "http://localhost:8000/api/v1/auth/register" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "email": "user@example.com",
+    "username": "testuser",
+    "password": "securepassword123"
+  }'
+```
+
+#### Login
+```bash
+curl -X POST "http://localhost:8000/api/v1/auth/login" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "username": "testuser",
+    "password": "securepassword123"
+  }'
+```
+
+#### Use JWT Token
+```bash
+# Get token from login response and use in subsequent requests
+curl -X GET "http://localhost:8000/api/v1/products" \
+  -H "Authorization: Bearer YOUR_JWT_TOKEN"
+```
+
+### Product Management
+
+#### Create a product
+```bash
+curl -X POST "http://localhost:8000/api/v1/products" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "product_id": "PROD001",
+    "title": "Amazing Product",
+    "description": "An amazing product description",
+    "price": "29.99",
+    "currency": "EUR",
+    "brand": "BrandName",
+    "gtin": "1234567890123",
+    "availability": "in stock",
+    "marketplace": "Letzshop",
+    "shop_name": "MyShop"
+  }'
+```
+
+#### Get products with filtering
+```bash
+# Get all products
+curl -X GET "http://localhost:8000/api/v1/products" \
+  -H "Authorization: Bearer YOUR_TOKEN"
+
+# Filter by marketplace
+curl -X GET "http://localhost:8000/api/v1/products?marketplace=Amazon&limit=50" \
+  -H "Authorization: Bearer YOUR_TOKEN"
+
+# Search products
+curl -X GET "http://localhost:8000/api/v1/products?search=Amazing&brand=BrandName" \
+  -H "Authorization: Bearer YOUR_TOKEN"
+```
+
+### Stock Management
+
+#### Set stock quantity
+```bash
+curl -X POST "http://localhost:8000/api/v1/stock" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "gtin": "1234567890123",
+    "location": "WAREHOUSE_A",
+    "quantity": 100
+  }'
+```
+
+#### Add stock
+```bash
+curl -X POST "http://localhost:8000/api/v1/stock/add" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "gtin": "1234567890123",
+    "location": "WAREHOUSE_A",
+    "quantity": 25
+  }'
+```
+
+#### Check stock levels
+```bash
+curl -X GET "http://localhost:8000/api/v1/stock/1234567890123" \
+  -H "Authorization: Bearer YOUR_TOKEN"
+```
+
+### Marketplace Import
+
+#### Import products from CSV
+```bash
+curl -X POST "http://localhost:8000/api/v1/marketplace/import-from-marketplace" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "url": "https://example.com/products.csv",
+    "marketplace": "Amazon",
+    "shop_code": "MYSHOP",
+    "batch_size": 1000
+  }'
+```
+
+#### Check import status
+```bash
+curl -X GET "http://localhost:8000/api/v1/marketplace/marketplace-import-status/1" \
+  -H "Authorization: Bearer YOUR_TOKEN"
+```
+
+### Export Data
+
+#### Export products to CSV
+```bash
+# Export all products
+curl -X GET "http://localhost:8000/api/v1/export-csv" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -o products_export.csv
+
+# Export with filters
+curl -X GET "http://localhost:8000/api/v1/export-csv?marketplace=Amazon&shop_name=MyShop" \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -o amazon_products.csv
+```
+
+## CSV Import Format
+
+The system supports CSV imports with the following headers:
+
+### Required Fields
+- `product_id` - Unique product identifier
+- `title` - Product title
+
+### Optional Fields
+- `description` - Product description
+- `link` - Product URL
+- `image_link` - Product image URL
+- `availability` - Stock availability (in stock, out of stock, preorder)
+- `price` - Product price
+- `currency` - Price currency (EUR, USD, etc.)
+- `brand` - Product brand
+- `gtin` - Global Trade Item Number (EAN/UPC)
+- `google_product_category` - Product category
+- `marketplace` - Source marketplace
+- `shop_name` - Shop/seller name
+
+### Example CSV
+```csv
+product_id,title,description,price,currency,brand,gtin,marketplace,shop_name
+PROD001,"Amazing Widget","The best widget ever",29.99,EUR,WidgetCorp,1234567890123,Letzshop,MyShop
+PROD002,"Super Gadget","A fantastic gadget",19.99,EUR,GadgetInc,9876543210987,Amazon,TechStore
+```
+
+## Testing
+
+### Run Tests
+```bash
+# Install test dependencies
+pip install -r tests/requirements_test.txt
+
+# Run all tests
+pytest tests/ -v
+
+# Run with coverage report
+pytest tests/ --cov=app --cov=models --cov=utils --cov-report=html
+
+# Run specific test categories
+pytest tests/ -m unit -v                    # Unit tests only
+pytest tests/ -m integration -v             # Integration tests only
+pytest tests/ -m "not slow" -v              # Fast tests only
+
+# Run specific test files
+pytest tests/test_auth.py -v                # Authentication tests
+pytest tests/test_products.py -v            # Product tests
+pytest tests/test_stock.py -v               # Stock management tests
+```
+
+### Test Coverage
+The test suite includes:
+- **Unit Tests** - Individual component testing
+- **Integration Tests** - Full workflow testing
+- **Security Tests** - Authentication, authorization, input validation
+- **Performance Tests** - Load testing with large datasets
+- **Error Handling Tests** - Edge cases and error conditions
+
+## API Reference
+
+### Authentication Endpoints
+- `POST /api/v1/auth/register` - Register new user
+- `POST /api/v1/auth/login` - Login user
+- `GET /api/v1/auth/me` - Get current user info
+
+### Product Endpoints
+- `GET /api/v1/products` - List products with filtering
+- `POST /api/v1/products` - Create new product
+- `GET /api/v1/products/{product_id}` - Get specific product
+- `PUT /api/v1/products/{product_id}` - Update product
+- `DELETE /api/v1/products/{product_id}` - Delete product
+
+### Stock Endpoints
+- `POST /api/v1/stock` - Set stock quantity
+- `POST /api/v1/stock/add` - Add to stock
+- `POST /api/v1/stock/remove` - Remove from stock
+- `GET /api/v1/stock/{gtin}` - Get stock by GTIN
+- `GET /api/v1/stock/{gtin}/total` - Get total stock
+- `GET /api/v1/stock` - List all stock entries
+
+### Shop Endpoints
+- `POST /api/v1/shops` - Create new shop
+- `GET /api/v1/shops` - List shops
+- `GET /api/v1/shops/{shop_code}` - Get specific shop
+
+### Marketplace Endpoints
+- `POST /api/v1/marketplace/import-from-marketplace` - Start CSV import
+- `GET /api/v1/marketplace/marketplace-import-status/{job_id}` - Check import status
+- `GET /api/v1/marketplace/marketplace-import-jobs` - List import jobs
+
+### Statistics Endpoints
+- `GET /api/v1/stats` - Get general statistics
+- `GET /api/v1/stats/marketplace-stats` - Get marketplace statistics
+
+### Admin Endpoints (Admin only)
+- `GET /api/v1/admin/users` - List all users
+- `PUT /api/v1/admin/users/{user_id}/status` - Toggle user status
+- `GET /api/v1/admin/shops` - List all shops
+- `PUT /api/v1/admin/shops/{shop_id}/verify` - Verify/unverify shop
+
+## Database Schema
+
+### Core Tables
+- **users** - User accounts and authentication
+- **products** - Product catalog with marketplace info
+- **stock** - Inventory tracking by location and GTIN
+- **shops** - Shop/seller information
+- **shop_products** - Shop-specific product settings
+- **marketplace_import_jobs** - Background import job tracking
+
+### Key Relationships
+- Users own shops (one-to-many)
+- Products belong to marketplaces and shops
+- Stock entries are linked to products via GTIN
+- Import jobs track user-initiated imports
+
+## Security Features
+
+- **JWT Authentication** - Secure token-based authentication
+- **Password Hashing** - bcrypt for secure password storage
+- **Role-Based Access** - User and admin role separation
+- **Rate Limiting** - Protection against API abuse
+- **Input Validation** - Comprehensive data validation
+- **SQL Injection Protection** - Parameterized queries
+- **CORS Configuration** - Cross-origin request handling
+
+## Performance Optimizations
+
+- **Database Indexing** - Strategic indexes on key columns
+- **Pagination** - Efficient data retrieval with skip/limit
+- **Streaming Responses** - Memory-efficient CSV exports
+- **Background Processing** - Async import job handling
+- **Connection Pooling** - Efficient database connections
+- **Query Optimization** - Optimized database queries
+
+## Deployment
+
+### Docker Deployment
+```dockerfile
+FROM python:3.11
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+```
+
+### Production Considerations
+- Use PostgreSQL for production database
+- Set strong SECRET_KEY in environment
+- Configure proper CORS settings
+- Enable HTTPS
+- Set up monitoring and logging
+- Use a reverse proxy (nginx)
+- Configure database connection pooling
+- Set up backup strategies
+
+## Contributing
+
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Add tests for new functionality
+5. Ensure all tests pass
+6. Submit a pull request
+
+### Development Setup
+```bash
+# Install development dependencies
+pip install -r requirements_dev.txt
+
+# Run pre-commit hooks
+pre-commit install
+
+# Run linting
+flake8 app/ models/ utils/
+black app/ models/ utils/
+
+# Run type checking
+mypy app/
+```
+
+## Support & Documentation
+
+- **API Documentation**: http://localhost:8000/docs
+- **Health Check**: http://localhost:8000/health
+- **Version Info**: http://localhost:8000/
+
+For issues and feature requests, please create an issue in the repository.
+
+## License
+
+[Specify your license here]
+
+## Changelog
+
+### v2.2.0
+- Added marketplace-aware product import
+- Implemented multi-shop support
+- Enhanced stock management with location tracking
+- Added comprehensive test suite
+- Improved authentication and authorization
+
+### v2.1.0
+- Added JWT authentication
+- Implemented role-based access control
+- Added CSV import/export functionality
+
+### v2.0.0
+- Complete rewrite with FastAPI
+- Added PostgreSQL support
+- Implemented comprehensive API documentation

config/settings.py

@@ -10,6 +10,7 @@ class Settings(BaseSettings):
     # JWT
     jwt_secret_key: str = "change-this-in-production"
     jwt_expire_hours: int = 24
+    jwt_expire_minutes: int = 30
 
     # API
     api_host: str = "0.0.0.0"

middleware/decorators.py

@@ -0,0 +1,29 @@
+# middleware/decorators.py
+from functools import wraps
+from fastapi import HTTPException
+from middleware.rate_limiter import RateLimiter
+
+# Initialize rate limiter instance
+rate_limiter = RateLimiter()
+
+
+def rate_limit(max_requests: int = 100, window_seconds: int = 3600):
+    """Rate limiting decorator for FastAPI endpoints"""
+
+    def decorator(func):
+        @wraps(func)
+        async def wrapper(*args, **kwargs):
+            # Extract client IP or user ID for rate limiting
+            client_id = "anonymous"  # In production, extract from request
+
+            if not rate_limiter.allow_request(client_id, max_requests, window_seconds):
+                raise HTTPException(
+                    status_code=429,
+                    detail="Rate limit exceeded"
+                )
+
+            return await func(*args, **kwargs)
+
+        return wrapper
+
+    return decorator

tests/Makefile

@@ -0,0 +1,57 @@
+# Makefile for running tests
+# tests/Makefile
+.PHONY: test test-unit test-integration test-coverage test-fast test-slow
+
+# Run all tests
+test:
+	pytest tests/ -v
+
+# Run only unit tests
+test-unit:
+	pytest tests/ -v -m unit
+
+# Run only integration tests
+test-integration:
+	pytest tests/ -v -m integration
+
+# Run tests with coverage report
+test-coverage:
+	pytest tests/ --cov=app --cov=models --cov=utils --cov=middleware --cov-report=html --cov-report=term-missing
+
+# Run fast tests only (exclude slow ones)
+test-fast:
+	pytest tests/ -v -m "not slow"
+
+# Run slow tests only
+test-slow:
+	pytest tests/ -v -m slow
+
+# Run specific test file
+test-auth:
+	pytest tests/test_auth.py -v
+
+test-products:
+	pytest tests/test_products.py -v
+
+test-stock:
+	pytest tests/test_stock.py -v
+
+# Clean up test artifacts
+clean:
+	rm -rf htmlcov/
+	rm -rf .pytest_cache/
+	rm -rf .coverage
+	find . -type d -name "__pycache__" -exec rm -rf {} +
+	find . -name "*.pyc" -delete
+
+# Install test dependencies
+install-test-deps:
+	pip install -r tests/requirements_test.txtvalidate_csv_headers(valid_df) == True
+
+        # Invalid headers (missing required fields)
+        invalid_df = pd.DataFrame({
+            "id": ["TEST001"],  # Wrong column name
+            "name": ["Test"]
+        })
+
+        assert self.processor._

tests/__init__.py

@@ -0,0 +1,2 @@
+# tests/__init__.py
+# This file makes the tests directory a Python package

tests/conftest.py

@@ -0,0 +1,194 @@
+# tests/conftest.py
+import pytest
+import tempfile
+import os
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from main import app
+from app.core.database import get_db, Base
+from models.database_models import User, Product, Stock, Shop
+from middleware.auth import AuthManager
+
+# Use in-memory SQLite database for tests
+SQLALCHEMY_TEST_DATABASE_URL = "sqlite:///:memory:"
+
+
+@pytest.fixture(scope="session")
+def engine():
+    """Create test database engine"""
+    return create_engine(
+        SQLALCHEMY_TEST_DATABASE_URL,
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+        echo=False  # Set to True for SQL debugging
+    )
+
+
+@pytest.fixture(scope="session")
+def testing_session_local(engine):
+    """Create session factory for tests"""
+    return sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+@pytest.fixture(scope="function")
+def db(engine, testing_session_local):
+    """Create a fresh database for each test"""
+    # Create all tables
+    Base.metadata.create_all(bind=engine)
+
+    # Create session
+    db = testing_session_local()
+
+    # Override the dependency
+    def override_get_db():
+        try:
+            yield db
+        finally:
+            pass  # Don't close here, we'll close in cleanup
+
+    app.dependency_overrides[get_db] = override_get_db
+
+    try:
+        yield db
+    finally:
+        db.rollback()  # Rollback any uncommitted changes
+        db.close()
+        # Clean up the dependency override
+        if get_db in app.dependency_overrides:
+            del app.dependency_overrides[get_db]
+        # Drop all tables for next test
+        Base.metadata.drop_all(bind=engine)
+
+
+@pytest.fixture(scope="function")
+def client(db):
+    """Create a test client with database dependency override"""
+    return TestClient(app)
+
+
+@pytest.fixture(scope="session")
+def auth_manager():
+    """Create auth manager instance (session scope since it's stateless)"""
+    return AuthManager()
+
+
+@pytest.fixture
+def test_user(db, auth_manager):
+    """Create a test user"""
+    hashed_password = auth_manager.hash_password("testpass123")
+    user = User(
+        email="test@example.com",
+        username="testuser",
+        hashed_password=hashed_password,
+        role="user",
+        is_active=True
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+@pytest.fixture
+def test_admin(db, auth_manager):
+    """Create a test admin user"""
+    hashed_password = auth_manager.hash_password("adminpass123")
+    admin = User(
+        email="admin@example.com",
+        username="admin",
+        hashed_password=hashed_password,
+        role="admin",
+        is_active=True
+    )
+    db.add(admin)
+    db.commit()
+    db.refresh(admin)
+    return admin
+
+
+@pytest.fixture
+def auth_headers(client, test_user):
+    """Get authentication headers for test user"""
+    response = client.post("/api/v1/auth/login", json={
+        "username": "testuser",
+        "password": "testpass123"
+    })
+    assert response.status_code == 200, f"Login failed: {response.text}"
+    token = response.json()["access_token"]
+    return {"Authorization": f"Bearer {token}"}
+
+
+@pytest.fixture
+def admin_headers(client, test_admin):
+    """Get authentication headers for admin user"""
+    response = client.post("/api/v1/auth/login", json={
+        "username": "admin",
+        "password": "adminpass123"
+    })
+    assert response.status_code == 200, f"Admin login failed: {response.text}"
+    token = response.json()["access_token"]
+    return {"Authorization": f"Bearer {token}"}
+
+
+@pytest.fixture
+def test_product(db):
+    """Create a test product"""
+    product = Product(
+        product_id="TEST001",
+        title="Test Product",
+        description="A test product",
+        price="10.99",
+        currency="EUR",
+        brand="TestBrand",
+        gtin="1234567890123",
+        availability="in stock",
+        marketplace="Letzshop",
+        shop_name="TestShop"
+    )
+    db.add(product)
+    db.commit()
+    db.refresh(product)
+    return product
+
+
+@pytest.fixture
+def test_shop(db, test_user):
+    """Create a test shop"""
+    shop = Shop(
+        shop_code="TESTSHOP",
+        shop_name="Test Shop",
+        owner_id=test_user.id,
+        is_active=True,
+        is_verified=True
+    )
+    db.add(shop)
+    db.commit()
+    db.refresh(shop)
+    return shop
+
+
+@pytest.fixture
+def test_stock(db, test_product, test_shop):
+    """Create test stock entry"""
+    stock = Stock(
+        product_id=test_product.product_id,
+        shop_code=test_shop.shop_code,
+        quantity=10,
+        reserved_quantity=0
+    )
+    db.add(stock)
+    db.commit()
+    db.refresh(stock)
+    return stock
+
+
+# Cleanup fixture to ensure clean state
+@pytest.fixture(autouse=True)
+def cleanup():
+    """Automatically clean up after each test"""
+    yield
+    # Clear any remaining dependency overrides
+    app.dependency_overrides.clear()

tests/pytest.ini

@@ -0,0 +1,21 @@
+# tests/pytest.ini
+[tool:pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+addopts =
+    -v
+    --tb=short
+    --strict-markers
+    --disable-warnings
+    --color=yes
+markers =
+    slow: marks tests as slow (deselect with '-m "not slow"')
+    integration: marks tests as integration tests
+    unit: marks tests as unit tests
+    auth: marks tests related to authentication
+    products: marks tests related to products
+    stock: marks tests related to stock management
+    shops: marks tests related to shop management
+    admin: marks tests related to admin functionality

tests/requirements_test.txt

@@ -0,0 +1,8 @@
+# tests/requirements_test.txt
+# Testing dependencies
+pytest>=7.4.0
+pytest-cov>=4.1.0
+pytest-asyncio>=0.21.0
+pytest-mock>=3.11.0
+httpx>=0.24.0
+faker>=19.0.0

tests/test_admin.py

@@ -0,0 +1,34 @@
+# tests/test_admin.py
+import pytest
+
+
+class TestAdminAPI:
+    def test_get_all_users_admin(self, client, admin_headers, test_user):
+        """Test admin getting all users"""
+        response = client.get("/api/v1/admin/users", headers=admin_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data) >= 2  # test_user + admin user
+
+    def test_get_all_users_non_admin(self, client, auth_headers):
+        """Test non-admin trying to access admin endpoint"""
+        response = client.get("/api/v1/admin/users", headers=auth_headers)
+
+        assert response.status_code == 403
+        assert "Access denied" in response.json()["detail"] or "admin" in response.json()["detail"].lower()
+
+    def test_toggle_user_status_admin(self, client, admin_headers, test_user):
+        """Test admin toggling user status"""
+        response = client.put(f"/api/v1/admin/users/{test_user.id}/status", headers=admin_headers)
+
+        assert response.status_code == 200
+        assert "deactivated" in response.json()["message"] or "activated" in response.json()["message"]
+
+    def test_get_all_shops_admin(self, client, admin_headers, test_shop):
+        """Test admin getting all shops"""
+        response = client.get("/api/v1/admin/shops", headers=admin_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] >= 1

tests/test_auth.py

@@ -0,0 +1,119 @@
+# tests/test_auth.py
+import pytest
+from fastapi import HTTPException
+
+
+class TestAuthenticationAPI:
+    def test_register_user_success(self, client, db):
+        """Test successful user registration"""
+        response = client.post("/api/v1/auth/register", json={
+            "email": "newuser@example.com",
+            "username": "newuser",
+            "password": "securepass123"
+        })
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["email"] == "newuser@example.com"
+        assert data["username"] == "newuser"
+        assert data["role"] == "user"
+        assert data["is_active"] == True
+        assert "hashed_password" not in data
+
+    def test_register_user_duplicate_email(self, client, test_user):
+        """Test registration with duplicate email"""
+        response = client.post("/api/v1/auth/register", json={
+            "email": "test@example.com",  # Same as test_user
+            "username": "newuser",
+            "password": "securepass123"
+        })
+
+        assert response.status_code == 400
+        assert "Email already registered" in response.json()["detail"]
+
+    def test_register_user_duplicate_username(self, client, test_user):
+        """Test registration with duplicate username"""
+        response = client.post("/api/v1/auth/register", json={
+            "email": "new@example.com",
+            "username": "testuser",  # Same as test_user
+            "password": "securepass123"
+        })
+
+        assert response.status_code == 400
+        assert "Username already taken" in response.json()["detail"]
+
+    def test_login_success(self, client, test_user):
+        """Test successful login"""
+        response = client.post("/api/v1/auth/login", json={
+            "username": "testuser",
+            "password": "testpass123"
+        })
+
+        assert response.status_code == 200
+        data = response.json()
+        assert "access_token" in data
+        assert data["token_type"] == "bearer"
+        assert "expires_in" in data
+        assert data["user"]["username"] == "testuser"
+
+    def test_login_wrong_password(self, client, test_user):
+        """Test login with wrong password"""
+        response = client.post("/api/v1/auth/login", json={
+            "username": "testuser",
+            "password": "wrongpassword"
+        })
+
+        assert response.status_code == 401
+        assert "Incorrect username or password" in response.json()["detail"]
+
+    def test_login_nonexistent_user(self, client):
+        """Test login with nonexistent user"""
+        response = client.post("/api/v1/auth/login", json={
+            "username": "nonexistent",
+            "password": "password123"
+        })
+
+        assert response.status_code == 401
+
+    def test_get_current_user_info(self, client, auth_headers):
+        """Test getting current user info"""
+        response = client.get("/api/v1/auth/me", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["username"] == "testuser"
+        assert data["email"] == "test@example.com"
+
+    def test_get_current_user_no_auth(self, client):
+        """Test getting current user without authentication"""
+        response = client.get("/api/v1/auth/me")
+
+        assert response.status_code == 403  # No authorization header
+
+
+class TestAuthManager:
+    def test_hash_password(self, auth_manager):
+        """Test password hashing"""
+        password = "testpassword123"
+        hashed = auth_manager.hash_password(password)
+
+        assert hashed != password
+        assert len(hashed) > 20  # bcrypt hashes are long
+
+    def test_verify_password(self, auth_manager):
+        """Test password verification"""
+        password = "testpassword123"
+        hashed = auth_manager.hash_password(password)
+
+        assert auth_manager.verify_password(password, hashed) == True
+        assert auth_manager.verify_password("wrongpassword", hashed) == False
+
+    def test_create_access_token(self, auth_manager, test_user):
+        """Test JWT token creation"""
+        token_data = auth_manager.create_access_token(test_user)
+
+        assert "access_token" in token_data
+        assert token_data["token_type"] == "bearer"
+        assert "expires_in" in token_data
+        assert isinstance(token_data["expires_in"], int)
+

tests/test_background_tasks.py

@@ -0,0 +1,83 @@
+# tests/test_background_tasks.py
+import pytest
+from unittest.mock import patch, AsyncMock
+from app.tasks.background_tasks import process_marketplace_import
+from models.database_models import MarketplaceImportJob
+
+
+class TestBackgroundTasks:
+    @pytest.mark.asyncio
+    async def test_marketplace_import_success(self, db):
+        """Test successful marketplace import background task"""
+        # Create import job
+        job = MarketplaceImportJob(
+            status="pending",
+            source_url="http://example.com/test.csv",
+            marketplace="TestMarket",
+            shop_code="TESTSHOP",
+            user_id=1
+        )
+        db.add(job)
+        db.commit()
+        db.refresh(job)
+
+        # Mock CSV processor
+        with patch('app.tasks.background_tasks.CSVProcessor') as mock_processor:
+            mock_instance = mock_processor.return_value
+            mock_instance.process_marketplace_csv_from_url = AsyncMock(return_value={
+                "imported": 10,
+                "updated": 5,
+                "total_processed": 15,
+                "errors": 0
+            })
+
+            # Run background task
+            await process_marketplace_import(
+                job.id,
+                "http://example.com/test.csv",
+                "TestMarket",
+                "TESTSHOP",
+                1000
+            )
+
+            # Verify job was updated
+            db.refresh(job)
+            assert job.status == "completed"
+            assert job.imported_count == 10
+            assert job.updated_count == 5
+
+    @pytest.mark.asyncio
+    async def test_marketplace_import_failure(self, db):
+        """Test marketplace import failure handling"""
+        # Create import job
+        job = MarketplaceImportJob(
+            status="pending",
+            source_url="http://example.com/test.csv",
+            marketplace="TestMarket",
+            shop_code="TESTSHOP",
+            user_id=1
+        )
+        db.add(job)
+        db.commit()
+        db.refresh(job)
+
+        # Mock CSV processor to raise exception
+        with patch('app.tasks.background_tasks.CSVProcessor') as mock_processor:
+            mock_instance = mock_processor.return_value
+            mock_instance.process_marketplace_csv_from_url = AsyncMock(
+                side_effect=Exception("Import failed")
+            )
+
+            # Run background task
+            await process_marketplace_import(
+                job.id,
+                "http://example.com/test.csv",
+                "TestMarket",
+                "TESTSHOP",
+                1000
+            )
+
+            # Verify job failure was recorded
+            db.refresh(job)
+            assert job.status == "failed"
+            assert "Import failed" in job.error_message

tests/test_csv_processor.py

@@ -0,0 +1,90 @@
+# tests/test_csv_processor.py
+import pytest
+from unittest.mock import Mock, patch, AsyncMock
+from io import StringIO
+import pandas as pd
+from utils.csv_processor import CSVProcessor
+
+
+class TestCSVProcessor:
+    def setup_method(self):
+        self.processor = CSVProcessor()
+
+    @patch('requests.get')
+    def test_download_csv_success(self, mock_get):
+        """Test successful CSV download"""
+        # Mock successful HTTP response
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.text = "product_id,title,price\nTEST001,Test Product,10.99"
+        mock_get.return_value = mock_response
+
+        csv_content = self.processor._download_csv("http://example.com/test.csv")
+
+        assert "product_id,title,price" in csv_content
+        assert "TEST001,Test Product,10.99" in csv_content
+
+    @patch('requests.get')
+    def test_download_csv_failure(self, mock_get):
+        """Test CSV download failure"""
+        # Mock failed HTTP response
+        mock_response = Mock()
+        mock_response.status_code = 404
+        mock_get.return_value = mock_response
+
+        with pytest.raises(Exception):
+            self.processor._download_csv("http://example.com/nonexistent.csv")
+
+    def test_parse_csv_content(self):
+        """Test CSV content parsing"""
+        csv_content = """product_id,title,price,marketplace
+TEST001,Test Product 1,10.99,TestMarket
+TEST002,Test Product 2,15.99,TestMarket"""
+
+        df = self.processor._parse_csv_content(csv_content)
+
+        assert len(df) == 2
+        assert "product_id" in df.columns
+        assert df.iloc[0]["product_id"] == "TEST001"
+        assert df.iloc[1]["price"] == "15.99"
+
+    def test_validate_csv_headers(self):
+        """Test CSV header validation"""
+        # Valid headers
+        valid_df = pd.DataFrame({
+            "product_id": ["TEST001"],
+            "title": ["Test"],
+            "price": ["10.99"]
+        })
+
+        assert self.processor._validate_csv_headers(invalid_df) == False
+
+    @pytest.mark.asyncio
+    async def test_process_marketplace_csv_from_url(self, db):
+        """Test complete marketplace CSV processing"""
+        with patch.object(self.processor, '_download_csv') as mock_download, \
+                patch.object(self.processor, '_parse_csv_content') as mock_parse, \
+                patch.object(self.processor, '_validate_csv_headers') as mock_validate:
+            # Mock successful download and parsing
+            mock_download.return_value = "csv_content"
+            mock_df = pd.DataFrame({
+                "product_id": ["TEST001", "TEST002"],
+                "title": ["Product 1", "Product 2"],
+                "price": ["10.99", "15.99"],
+                "marketplace": ["TestMarket", "TestMarket"],
+                "shop_name": ["TestShop", "TestShop"]
+            })
+            mock_parse.return_value = mock_df
+            mock_validate.return_value = True
+
+            result = await self.processor.process_marketplace_csv_from_url(
+                "http://example.com/test.csv",
+                "TestMarket",
+                "TestShop",
+                1000,
+                db
+            )
+
+            assert "imported" in result
+            assert "updated" in result
+            assert "total_processed" in result

tests/test_data_validation.py

@@ -0,0 +1,46 @@
+# tests/test_data_validation.py
+import pytest
+from utils.data_processing import GTINProcessor, PriceProcessor
+
+
+class TestDataValidation:
+    def test_gtin_normalization_edge_cases(self):
+        """Test GTIN normalization with edge cases"""
+        processor = GTINProcessor()
+
+        # Test with leading zeros
+        assert processor.normalize("000123456789") == "000123456789"
+
+        # Test with spaces
+        assert processor.normalize("123 456 789 012") == "123456789012"
+
+        # Test with dashes
+        assert processor.normalize("123-456-789-012") == "123456789012"
+
+        # Test very long numbers
+        long_number = "1234567890123456789"
+        normalized = processor.normalize(long_number)
+        assert len(normalized) <= 14  # Should be truncated
+
+    def test_price_parsing_edge_cases(self):
+        """Test price parsing with edge cases"""
+        processor = PriceProcessor()
+
+        # Test with multiple decimal places
+        price, currency = processor.parse_price_currency("12.999 EUR")
+        assert price == "12.999"
+
+        # Test with no currency
+        price, currency = processor.parse_price_currency("15.50")
+        assert price == "15.50"
+
+        # Test with unusual formatting
+        price, currency = processor.parse_price_currency("EUR 25,50")
+        assert currency == "EUR"
+        assert price == "25.50"  # Comma should be converted to dot
+
+    def test_input_sanitization(self):
+        """Test input sanitization"""
+        # These tests would verify that inputs are properly sanitized
+        # to prevent SQL injection, XSS, etc.
+        pass  # Implementation would depend on your sanitization logic

tests/test_database.py

@@ -0,0 +1,98 @@
+# tests/test_database.py
+import pytest
+from sqlalchemy import text
+from models.database_models import User, Product, Stock, Shop
+
+
+class TestDatabaseModels:
+    def test_user_model(self, db):
+        """Test User model creation and relationships"""
+        user = User(
+            email="db_test@example.com",
+            username="dbtest",
+            hashed_password="hashed_password_123",
+            role="user",
+            is_active=True
+        )
+
+        db.add(user)
+        db.commit()
+        db.refresh(user)
+
+        assert user.id is not None
+        assert user.email == "db_test@example.com"
+        assert user.created_at is not None
+        assert user.updated_at is not None
+
+    def test_product_model(self, db):
+        """Test Product model creation"""
+        product = Product(
+            product_id="DB_TEST_001",
+            title="Database Test Product",
+            description="Testing product model",
+            price="25.99",
+            currency="USD",
+            brand="DBTest",
+            gtin="1234567890123",
+            availability="in stock",
+            marketplace="TestDB",
+            shop_name="DBTestShop"
+        )
+
+        db.add(product)
+        db.commit()
+        db.refresh(product)
+
+        assert product.id is not None
+        assert product.product_id == "DB_TEST_001"
+        assert product.created_at is not None
+
+    def test_stock_model(self, db):
+        """Test Stock model creation"""
+        stock = Stock(
+            gtin="1234567890123",
+            location="DB_WAREHOUSE",
+            quantity=150
+        )
+
+        db.add(stock)
+        db.commit()
+        db.refresh(stock)
+
+        assert stock.id is not None
+        assert stock.gtin == "1234567890123"
+        assert stock.location == "DB_WAREHOUSE"
+        assert stock.quantity == 150
+
+    def test_shop_model_with_owner(self, db, test_user):
+        """Test Shop model with owner relationship"""
+        shop = Shop(
+            shop_code="DBTEST",
+            shop_name="Database Test Shop",
+            description="Testing shop model",
+            owner_id=test_user.id,
+            is_active=True,
+            is_verified=False
+        )
+
+        db.add(shop)
+        db.commit()
+        db.refresh(shop)
+
+        assert shop.id is not None
+        assert shop.shop_code == "DBTEST"
+        assert shop.owner_id == test_user.id
+        assert shop.owner.username == test_user.username
+
+    def test_database_constraints(self, db):
+        """Test database constraints and unique indexes"""
+        # Test unique product_id constraint
+        product1 = Product(product_id="UNIQUE_001", title="Product 1")
+        db.add(product1)
+        db.commit()
+
+        # This should raise an integrity error
+        with pytest.raises(Exception):  # Could be IntegrityError or similar
+            product2 = Product(product_id="UNIQUE_001", title="Product 2")
+            db.add(product2)
+            db.commit()

tests/test_error_handling.py

@@ -0,0 +1,45 @@
+# tests/test_error_handling.py
+import pytest
+
+
+class TestErrorHandling:
+    def test_invalid_json(self, client, auth_headers):
+        """Test handling of invalid JSON"""
+        response = client.post("/api/v1/products",
+                               headers=auth_headers,
+                               data="invalid json")
+
+        assert response.status_code == 422  # Validation error
+
+    def test_missing_required_fields(self, client, auth_headers):
+        """Test handling of missing required fields"""
+        response = client.post("/api/v1/products",
+                               headers=auth_headers,
+                               json={"title": "Test"})  # Missing product_id
+
+        assert response.status_code == 422
+
+    def test_invalid_authentication(self, client):
+        """Test handling of invalid authentication"""
+        response = client.get("/api/v1/products",
+                              headers={"Authorization": "Bearer invalid_token"})
+
+        assert response.status_code == 403
+
+    def test_nonexistent_resource(self, client, auth_headers):
+        """Test handling of nonexistent resource access"""
+        response = client.get("/api/v1/products/NONEXISTENT", headers=auth_headers)
+        assert response.status_code == 404
+
+        response = client.get("/api/v1/shops/NONEXISTENT", headers=auth_headers)
+        assert response.status_code == 404
+
+    def test_duplicate_resource_creation(self, client, auth_headers, test_product):
+        """Test handling of duplicate resource creation"""
+        product_data = {
+            "product_id": test_product.product_id,  # Duplicate ID
+            "title": "Another Product"
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+        assert response.status_code == 400

tests/test_export.py

@@ -0,0 +1,65 @@
+# tests/test_export.py
+import pytest
+import csv
+from io import StringIO
+
+
+class TestExportFunctionality:
+    def test_csv_export_basic(self, client, auth_headers, test_product):
+        """Test basic CSV export functionality"""
+        response = client.get("/api/v1/export-csv", headers=auth_headers)
+
+        assert response.status_code == 200
+        assert response.headers["content-type"] == "text/csv; charset=utf-8"
+
+        # Parse CSV content
+        csv_content = response.content.decode('utf-8')
+        csv_reader = csv.reader(StringIO(csv_content))
+
+        # Check header row
+        header = next(csv_reader)
+        expected_fields = ["product_id", "title", "description", "price", "marketplace"]
+        for field in expected_fields:
+            assert field in header
+
+    def test_csv_export_with_marketplace_filter(self, client, auth_headers, db):
+        """Test CSV export with marketplace filtering"""
+        # Create products in different marketplaces
+        products = [
+            Product(product_id="EXP1", title="Product 1", marketplace="Amazon"),
+            Product(product_id="EXP2", title="Product 2", marketplace="eBay"),
+        ]
+
+        db.add_all(products)
+        db.commit()
+
+        response = client.get("/api/v1/export-csv?marketplace=Amazon", headers=auth_headers)
+        assert response.status_code == 200
+
+        csv_content = response.content.decode('utf-8')
+        assert "EXP1" in csv_content
+        assert "EXP2" not in csv_content  # Should be filtered out
+
+    def test_csv_export_performance(self, client, auth_headers, db):
+        """Test CSV export performance with many products"""
+        # Create many products
+        products = []
+        for i in range(1000):
+            product = Product(
+                product_id=f"PERF{i:04d}",
+                title=f"Performance Product {i}",
+                marketplace="Performance"
+            )
+            products.append(product)
+
+        db.add_all(products)
+        db.commit()
+
+        import time
+        start_time = time.time()
+        response = client.get("/api/v1/export-csv", headers=auth_headers)
+        end_time = time.time()
+
+        assert response.status_code == 200
+        assert end_time - start_time < 10.0  # Should complete within 10 seconds
+        

tests/test_filtering.py

@@ -0,0 +1,85 @@
+# tests/test_filtering.py
+import pytest
+from models.database_models import Product
+
+
+class TestFiltering:
+    def test_product_brand_filter(self, client, auth_headers, db):
+        """Test filtering products by brand"""
+        # Create products with different brands
+        products = [
+            Product(product_id="BRAND1", title="Product 1", brand="BrandA"),
+            Product(product_id="BRAND2", title="Product 2", brand="BrandB"),
+            Product(product_id="BRAND3", title="Product 3", brand="BrandA"),
+        ]
+
+        db.add_all(products)
+        db.commit()
+
+        # Filter by BrandA
+        response = client.get("/api/v1/products?brand=BrandA", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 2
+
+        # Filter by BrandB
+        response = client.get("/api/v1/products?brand=BrandB", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 1
+
+    def test_product_marketplace_filter(self, client, auth_headers, db):
+        """Test filtering products by marketplace"""
+        products = [
+            Product(product_id="MKT1", title="Product 1", marketplace="Amazon"),
+            Product(product_id="MKT2", title="Product 2", marketplace="eBay"),
+            Product(product_id="MKT3", title="Product 3", marketplace="Amazon"),
+        ]
+
+        db.add_all(products)
+        db.commit()
+
+        response = client.get("/api/v1/products?marketplace=Amazon", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 2
+
+    def test_product_search_filter(self, client, auth_headers, db):
+        """Test searching products by text"""
+        products = [
+            Product(product_id="SEARCH1", title="Apple iPhone", description="Smartphone"),
+            Product(product_id="SEARCH2", title="Samsung Galaxy", description="Android phone"),
+            Product(product_id="SEARCH3", title="iPad Tablet", description="Apple tablet"),
+        ]
+
+        db.add_all(products)
+        db.commit()
+
+        # Search for "Apple"
+        response = client.get("/api/v1/products?search=Apple", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 2  # iPhone and iPad
+
+        # Search for "phone"
+        response = client.get("/api/v1/products?search=phone", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 2  # iPhone and Galaxy
+
+    def test_combined_filters(self, client, auth_headers, db):
+        """Test combining multiple filters"""
+        products = [
+            Product(product_id="COMBO1", title="Apple iPhone", brand="Apple", marketplace="Amazon"),
+            Product(product_id="COMBO2", title="Apple iPad", brand="Apple", marketplace="eBay"),
+            Product(product_id="COMBO3", title="Samsung Phone", brand="Samsung", marketplace="Amazon"),
+        ]
+
+        db.add_all(products)
+        db.commit()
+
+        # Filter by brand AND marketplace
+        response = client.get("/api/v1/products?brand=Apple&marketplace=Amazon", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] == 1  # Only iPhone matches both

tests/test_integration.py

@@ -0,0 +1,117 @@
+# tests/test_integration.py
+import pytest
+
+
+class TestIntegrationFlows:
+    def test_full_product_workflow(self, client, auth_headers):
+        """Test complete product creation and management workflow"""
+        # 1. Create a product
+        product_data = {
+            "product_id": "FLOW001",
+            "title": "Integration Test Product",
+            "description": "Testing full workflow",
+            "price": "29.99",
+            "brand": "FlowBrand",
+            "gtin": "1111222233334",
+            "availability": "in stock",
+            "marketplace": "TestFlow"
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+        assert response.status_code == 200
+        product = response.json()
+
+        # 2. Add stock for the product
+        stock_data = {
+            "gtin": product["gtin"],
+            "location": "MAIN_WAREHOUSE",
+            "quantity": 50
+        }
+
+        response = client.post("/api/v1/stock", headers=auth_headers, json=stock_data)
+        assert response.status_code == 200
+
+        # 3. Get product with stock info
+        response = client.get(f"/api/v1/products/{product['product_id']}", headers=auth_headers)
+        assert response.status_code == 200
+        product_detail = response.json()
+        assert product_detail["stock_info"]["total_quantity"] == 50
+
+        # 4. Update product
+        update_data = {"title": "Updated Integration Test Product"}
+        response = client.put(f"/api/v1/products/{product['product_id']}",
+                              headers=auth_headers, json=update_data)
+        assert response.status_code == 200
+
+        # 5. Search for product
+        response = client.get("/api/v1/products?search=Updated Integration", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["total"] == 1
+
+    def test_shop_product_workflow(self, client, auth_headers):
+        """Test shop creation and product management workflow"""
+        # 1. Create a shop
+        shop_data = {
+            "shop_code": "FLOWSHOP",
+            "shop_name": "Integration Flow Shop",
+            "description": "Test shop for integration"
+        }
+
+        response = client.post("/api/v1/shops", headers=auth_headers, json=shop_data)
+        assert response.status_code == 200
+        shop = response.json()
+
+        # 2. Create a product
+        product_data = {
+            "product_id": "SHOPFLOW001",
+            "title": "Shop Flow Product",
+            "price": "15.99",
+            "marketplace": "ShopFlow"
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+        assert response.status_code == 200
+        product = response.json()
+
+        # 3. Add product to shop (if endpoint exists)
+        # This would test the shop-product association
+
+        # 4. Get shop details
+        response = client.get(f"/api/v1/shops/{shop['shop_code']}", headers=auth_headers)
+        assert response.status_code == 200
+
+    def test_stock_operations_workflow(self, client, auth_headers):
+        """Test complete stock management workflow"""
+        gtin = "9999888877776"
+        location = "TEST_WAREHOUSE"
+
+        # 1. Set initial stock
+        response = client.post("/api/v1/stock", headers=auth_headers, json={
+            "gtin": gtin,
+            "location": location,
+            "quantity": 100
+        })
+        assert response.status_code == 200
+
+        # 2. Add more stock
+        response = client.post("/api/v1/stock/add", headers=auth_headers, json={
+            "gtin": gtin,
+            "location": location,
+            "quantity": 25
+        })
+        assert response.status_code == 200
+        assert response.json()["quantity"] == 125
+
+        # 3. Remove some stock
+        response = client.post("/api/v1/stock/remove", headers=auth_headers, json={
+            "gtin": gtin,
+            "location": location,
+            "quantity": 30
+        })
+        assert response.status_code == 200
+        assert response.json()["quantity"] == 95
+
+        # 4. Check total stock
+        response = client.get(f"/api/v1/stock/{gtin}/total", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["total_quantity"] == 95

tests/test_marketplace.py

@@ -0,0 +1,52 @@
+# tests/test_marketplace.py
+import pytest
+from unittest.mock import patch, AsyncMock
+
+
+class TestMarketplaceAPI:
+    @patch('utils.csv_processor.CSVProcessor.process_marketplace_csv_from_url')
+    def test_import_from_marketplace(self, mock_process, client, auth_headers, test_shop):
+        """Test marketplace import endpoint"""
+        mock_process.return_value = AsyncMock()
+
+        import_data = {
+            "url": "https://example.com/products.csv",
+            "marketplace": "TestMarket",
+            "shop_code": test_shop.shop_code
+        }
+
+        response = client.post("/api/v1/marketplace/import-from-marketplace",
+                               headers=auth_headers, json=import_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["status"] == "pending"
+        assert data["marketplace"] == "TestMarket"
+        assert "job_id" in data
+
+    def test_import_from_marketplace_invalid_shop(self, client, auth_headers):
+        """Test marketplace import with invalid shop"""
+        import_data = {
+            "url": "https://example.com/products.csv",
+            "marketplace": "TestMarket",
+            "shop_code": "NONEXISTENT"
+        }
+
+        response = client.post("/api/v1/marketplace/import-from-marketplace",
+                               headers=auth_headers, json=import_data)
+
+        assert response.status_code == 404
+        assert "Shop not found" in response.json()["detail"]
+
+    def test_get_marketplace_import_jobs(self, client, auth_headers):
+        """Test getting marketplace import jobs"""
+        response = client.get("/api/v1/marketplace/marketplace-import-jobs", headers=auth_headers)
+
+        assert response.status_code == 200
+        assert isinstance(response.json(), list)
+
+    def test_marketplace_requires_auth(self, client):
+        """Test that marketplace endpoints require authentication"""
+        response = client.get("/api/v1/marketplace/marketplace-import-jobs")
+        assert response.status_code == 403
+

tests/test_middleware.py

@@ -0,0 +1,63 @@
+# tests/test_middleware.py
+import pytest
+from unittest.mock import Mock, patch
+from middleware.rate_limiter import RateLimiter
+from middleware.auth import AuthManager
+
+
+class TestRateLimiter:
+    def test_rate_limiter_allows_requests(self):
+        """Test rate limiter allows requests within limit"""
+        limiter = RateLimiter()
+        client_id = "test_client"
+
+        # Should allow first request
+        assert limiter.allow_request(client_id, max_requests=10, window_seconds=3600) == True
+
+        # Should allow subsequent requests within limit
+        for _ in range(5):
+            assert limiter.allow_request(client_id, max_requests=10, window_seconds=3600) == True
+
+    def test_rate_limiter_blocks_excess_requests(self):
+        """Test rate limiter blocks requests exceeding limit"""
+        limiter = RateLimiter()
+        client_id = "test_client_blocked"
+        max_requests = 3
+
+        # Use up the allowed requests
+        for _ in range(max_requests):
+            assert limiter.allow_request(client_id, max_requests, 3600) == True
+
+        # Next request should be blocked
+        assert limiter.allow_request(client_id, max_requests, 3600) == False
+
+
+class TestAuthManager:
+    def test_password_hashing_and_verification(self):
+        """Test password hashing and verification"""
+        auth_manager = AuthManager()
+        password = "test_password_123"
+
+        # Hash password
+        hashed = auth_manager.hash_password(password)
+
+        # Verify correct password
+        assert auth_manager.verify_password(password, hashed) == True
+
+        # Verify incorrect password
+        assert auth_manager.verify_password("wrong_password", hashed) == False
+
+    def test_jwt_token_creation_and_validation(self, test_user):
+        """Test JWT token creation and validation"""
+        auth_manager = AuthManager()
+
+        # Create token
+        token_data = auth_manager.create_access_token(test_user)
+
+        assert "access_token" in token_data
+        assert token_data["token_type"] == "bearer"
+        assert isinstance(token_data["expires_in"], int)
+
+        # Token should be a string
+        assert isinstance(token_data["access_token"], str)
+        assert len(token_data["access_token"]) > 50  # JWT tokens are long

tests/test_pagination.py

@@ -0,0 +1,56 @@
+# tests/test_pagination.py
+import pytest
+from models.database_models import Product
+
+
+class TestPagination:
+    def test_product_pagination(self, client, auth_headers, db):
+        """Test pagination for product listing"""
+        # Create multiple products
+        products = []
+        for i in range(25):
+            product = Product(
+                product_id=f"PAGE{i:03d}",
+                title=f"Pagination Test Product {i}",
+                marketplace="PaginationTest"
+            )
+            products.append(product)
+
+        db.add_all(products)
+        db.commit()
+
+        # Test first page
+        response = client.get("/api/v1/products?limit=10&skip=0", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 10
+        assert data["total"] == 25
+        assert data["skip"] == 0
+        assert data["limit"] == 10
+
+        # Test second page
+        response = client.get("/api/v1/products?limit=10&skip=10", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 10
+        assert data["skip"] == 10
+
+        # Test last page
+        response = client.get("/api/v1/products?limit=10&skip=20", headers=auth_headers)
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 5  # Only 5 remaining
+
+    def test_pagination_boundaries(self, client, auth_headers):
+        """Test pagination boundary conditions"""
+        # Test negative skip
+        response = client.get("/api/v1/products?skip=-1", headers=auth_headers)
+        assert response.status_code == 422  # Validation error
+
+        # Test zero limit
+        response = client.get("/api/v1/products?limit=0", headers=auth_headers)
+        assert response.status_code == 422  # Validation error
+
+        # Test excessive limit
+        response = client.get("/api/v1/products?limit=10000", headers=auth_headers)
+        assert response.status_code == 422  # Should be limited

tests/test_performance.py

@@ -0,0 +1,56 @@
+# tests/test_performance.py
+import pytest
+import time
+
+
+class TestPerformance:
+    def test_product_list_performance(self, client, auth_headers, db):
+        """Test performance of product listing with many products"""
+        # Create multiple products
+        products = []
+        for i in range(100):
+            product = Product(
+                product_id=f"PERF{i:03d}",
+                title=f"Performance Test Product {i}",
+                price=f"{i}.99",
+                marketplace="Performance"
+            )
+            products.append(product)
+
+        db.add_all(products)
+        db.commit()
+
+        # Time the request
+        start_time = time.time()
+        response = client.get("/api/v1/products?limit=100", headers=auth_headers)
+        end_time = time.time()
+
+        assert response.status_code == 200
+        assert len(response.json()["products"]) == 100
+        assert end_time - start_time < 2.0  # Should complete within 2 seconds
+
+    def test_search_performance(self, client, auth_headers, db):
+        """Test search performance"""
+        # Create products with searchable content
+        products = []
+        for i in range(50):
+            product = Product(
+                product_id=f"SEARCH{i:03d}",
+                title=f"Searchable Product {i}",
+                description=f"This is a searchable product number {i}",
+                brand="SearchBrand",
+                marketplace="SearchMarket"
+            )
+            products.append(product)
+
+        db.add_all(products)
+        db.commit()
+
+        # Time search request
+        start_time = time.time()
+        response = client.get("/api/v1/products?search=Searchable", headers=auth_headers)
+        end_time = time.time()
+
+        assert response.status_code == 200
+        assert response.json()["total"] == 50
+        assert end_time - start_time < 1.0  # Search should be fast

tests/test_products.py

@@ -0,0 +1,122 @@
+# tests/test_products.py
+import pytest
+
+
+class TestProductsAPI:
+    def test_get_products_empty(self, client, auth_headers):
+        """Test getting products when none exist"""
+        response = client.get("/api/v1/products", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["products"] == []
+        assert data["total"] == 0
+
+    def test_get_products_with_data(self, client, auth_headers, test_product):
+        """Test getting products with data"""
+        response = client.get("/api/v1/products", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["products"]) == 1
+        assert data["total"] == 1
+        assert data["products"][0]["product_id"] == "TEST001"
+
+    def test_get_products_with_filters(self, client, auth_headers, test_product):
+        """Test filtering products"""
+        # Test brand filter
+        response = client.get("/api/v1/products?brand=TestBrand", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["total"] == 1
+
+        # Test marketplace filter
+        response = client.get("/api/v1/products?marketplace=Letzshop", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["total"] == 1
+
+        # Test search
+        response = client.get("/api/v1/products?search=Test", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["total"] == 1
+
+    def test_create_product(self, client, auth_headers):
+        """Test creating a new product"""
+        product_data = {
+            "product_id": "NEW001",
+            "title": "New Product",
+            "description": "A new product",
+            "price": "15.99",
+            "brand": "NewBrand",
+            "gtin": "9876543210987",
+            "availability": "in stock",
+            "marketplace": "Amazon"
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["product_id"] == "NEW001"
+        assert data["title"] == "New Product"
+        assert data["marketplace"] == "Amazon"
+
+    def test_create_product_duplicate_id(self, client, auth_headers, test_product):
+        """Test creating product with duplicate ID"""
+        product_data = {
+            "product_id": "TEST001",  # Same as test_product
+            "title": "Another Product",
+            "price": "20.00"
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+
+        assert response.status_code == 400
+        assert "already exists" in response.json()["detail"]
+
+    def test_get_product_by_id(self, client, auth_headers, test_product):
+        """Test getting specific product"""
+        response = client.get(f"/api/v1/products/{test_product.product_id}", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["product"]["product_id"] == test_product.product_id
+        assert data["product"]["title"] == test_product.title
+
+    def test_get_nonexistent_product(self, client, auth_headers):
+        """Test getting nonexistent product"""
+        response = client.get("/api/v1/products/NONEXISTENT", headers=auth_headers)
+
+        assert response.status_code == 404
+
+    def test_update_product(self, client, auth_headers, test_product):
+        """Test updating product"""
+        update_data = {
+            "title": "Updated Product Title",
+            "price": "25.99"
+        }
+
+        response = client.put(
+            f"/api/v1/products/{test_product.product_id}",
+            headers=auth_headers,
+            json=update_data
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["title"] == "Updated Product Title"
+        assert data["price"] == "25.99"
+
+    def test_delete_product(self, client, auth_headers, test_product):
+        """Test deleting product"""
+        response = client.delete(
+            f"/api/v1/products/{test_product.product_id}",
+            headers=auth_headers
+        )
+
+        assert response.status_code == 200
+        assert "deleted successfully" in response.json()["message"]
+
+    def test_products_require_auth(self, client):
+        """Test that product endpoints require authentication"""
+        response = client.get("/api/v1/products")
+        assert response.status_code == 403

tests/test_security.py

@@ -0,0 +1,61 @@
+# tests/test_security.py
+import pytest
+from fastapi import HTTPException
+from unittest.mock import patch
+
+
+class TestSecurity:
+    def test_protected_endpoint_without_auth(self, client):
+        """Test that protected endpoints reject unauthenticated requests"""
+        protected_endpoints = [
+            "/api/v1/products",
+            "/api/v1/stock",
+            "/api/v1/shops",
+            "/api/v1/stats",
+            "/api/v1/admin/users"
+        ]
+
+        for endpoint in protected_endpoints:
+            response = client.get(endpoint)
+            assert response.status_code == 403
+
+    def test_protected_endpoint_with_invalid_token(self, client):
+        """Test protected endpoints with invalid token"""
+        headers = {"Authorization": "Bearer invalid_token_here"}
+
+        response = client.get("/api/v1/products", headers=headers)
+        assert response.status_code == 403
+
+    def test_admin_endpoint_requires_admin_role(self, client, auth_headers):
+        """Test that admin endpoints require admin role"""
+        response = client.get("/api/v1/admin/users", headers=auth_headers)
+        assert response.status_code == 403  # Regular user should be denied
+
+    def test_sql_injection_prevention(self, client, auth_headers):
+        """Test SQL injection prevention in search parameters"""
+        # Try SQL injection in search parameter
+        malicious_search = "'; DROP TABLE products; --"
+
+        response = client.get(f"/api/v1/products?search={malicious_search}", headers=auth_headers)
+
+        # Should not crash and should return normal response
+        assert response.status_code == 200
+        # Database should still be intact (no products dropped)
+
+    def test_input_validation(self, client, auth_headers):
+        """Test input validation and sanitization"""
+        # Test XSS attempt in product creation
+        xss_payload = "<script>alert('xss')</script>"
+
+        product_data = {
+            "product_id": "XSS_TEST",
+            "title": xss_payload,
+            "description": xss_payload
+        }
+
+        response = client.post("/api/v1/products", headers=auth_headers, json=product_data)
+
+        if response.status_code == 200:
+            # If creation succeeds, content should be escaped/sanitized
+            data = response.json()
+            assert "<script>" not in data["title"]

tests/test_services.py

@@ -0,0 +1,60 @@
+# tests/test_services.py
+import pytest
+from app.services.product_service import ProductService
+from models.api_models import ProductCreate
+from models.database_models import Product
+
+
+class TestProductService:
+    def setup_method(self):
+        self.service = ProductService()
+
+    def test_create_product_with_gtin_validation(self, db):
+        """Test product creation with GTIN validation"""
+        product_data = ProductCreate(
+            product_id="SVC001",
+            title="Service Test Product",
+            gtin="1234567890123",
+            price="19.99",
+            marketplace="TestMarket"
+        )
+
+        product = self.service.create_product(db, product_data)
+
+        assert product.product_id == "SVC001"
+        assert product.gtin == "1234567890123"
+        assert product.marketplace == "TestMarket"
+
+    def test_create_product_invalid_gtin(self, db):
+        """Test product creation with invalid GTIN"""
+        product_data = ProductCreate(
+            product_id="SVC002",
+            title="Service Test Product",
+            gtin="invalid_gtin",
+            price="19.99"
+        )
+
+        with pytest.raises(ValueError, match="Invalid GTIN format"):
+            self.service.create_product(db, product_data)
+
+    def test_get_products_with_filters(self, db, test_product):
+        """Test getting products with various filters"""
+        products, total = self.service.get_products_with_filters(
+            db,
+            brand="TestBrand"
+        )
+
+        assert total == 1
+        assert len(products) == 1
+        assert products[0].brand == "TestBrand"
+
+    def test_get_products_with_search(self, db, test_product):
+        """Test getting products with search"""
+        products, total = self.service.get_products_with_filters(
+            db,
+            search="Test Product"
+        )
+
+        assert total == 1
+        assert len(products) == 1
+

tests/test_shops.py

@@ -0,0 +1,55 @@
+# tests/test_shops.py
+import pytest
+
+
+class TestShopsAPI:
+    def test_create_shop(self, client, auth_headers):
+        """Test creating a new shop"""
+        shop_data = {
+            "shop_code": "NEWSHOP",
+            "shop_name": "New Shop",
+            "description": "A new test shop"
+        }
+
+        response = client.post("/api/v1/shops", headers=auth_headers, json=shop_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["shop_code"] == "NEWSHOP"
+        assert data["shop_name"] == "New Shop"
+        assert data["is_active"] == True
+
+    def test_create_shop_duplicate_code(self, client, auth_headers, test_shop):
+        """Test creating shop with duplicate code"""
+        shop_data = {
+            "shop_code": "TESTSHOP",  # Same as test_shop
+            "shop_name": "Another Shop"
+        }
+
+        response = client.post("/api/v1/shops", headers=auth_headers, json=shop_data)
+
+        assert response.status_code == 400
+        assert "already exists" in response.json()["detail"]
+
+    def test_get_shops(self, client, auth_headers, test_shop):
+        """Test getting shops list"""
+        response = client.get("/api/v1/shops", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total"] >= 1
+        assert len(data["shops"]) >= 1
+
+    def test_get_shop_by_code(self, client, auth_headers, test_shop):
+        """Test getting specific shop"""
+        response = client.get(f"/api/v1/shops/{test_shop.shop_code}", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["shop_code"] == test_shop.shop_code
+        assert data["shop_name"] == test_shop.shop_name
+
+    def test_shops_require_auth(self, client):
+        """Test that shop endpoints require authentication"""
+        response = client.get("/api/v1/shops")
+        assert response.status_code == 403

tests/test_stats.py

@@ -0,0 +1,33 @@
+# tests/test_stats.py
+import pytest
+
+
+class TestStatsAPI:
+    def test_get_basic_stats(self, client, auth_headers, test_product):
+        """Test getting basic statistics"""
+        response = client.get("/api/v1/stats", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert "total_products" in data
+        assert "unique_brands" in data
+        assert "unique_categories" in data
+        assert "unique_marketplaces" in data
+        assert "unique_shops" in data
+        assert data["total_products"] >= 1
+
+    def test_get_marketplace_stats(self, client, auth_headers, test_product):
+        """Test getting marketplace statistics"""
+        response = client.get("/api/v1/stats/marketplace-stats", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert isinstance(data, list)
+        if len(data) > 0:
+            assert "marketplace" in data[0]
+            assert "total_products" in data[0]
+
+    def test_stats_require_auth(self, client):
+        """Test that stats endpoints require authentication"""
+        response = client.get("/api/v1/stats")
+        assert response.status_code == 403

tests/test_stock.py

@@ -0,0 +1,147 @@
+# tests/test_stock.py
+import pytest
+from models.database_models import Stock
+
+
+class TestStockAPI:
+    def test_set_stock_new(self, client, auth_headers):
+        """Test setting stock for new GTIN"""
+        stock_data = {
+            "gtin": "1234567890123",
+            "location": "WAREHOUSE_A",
+            "quantity": 100
+        }
+
+        response = client.post("/api/v1/stock", headers=auth_headers, json=stock_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["gtin"] == "1234567890123"
+        assert data["location"] == "WAREHOUSE_A"
+        assert data["quantity"] == 100
+
+    def test_set_stock_existing(self, client, auth_headers, db):
+        """Test updating existing stock"""
+        # Create initial stock
+        stock = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        db.add(stock)
+        db.commit()
+
+        stock_data = {
+            "gtin": "1234567890123",
+            "location": "WAREHOUSE_A",
+            "quantity": 75
+        }
+
+        response = client.post("/api/v1/stock", headers=auth_headers, json=stock_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["quantity"] == 75  # Should be replaced, not added
+
+    def test_add_stock(self, client, auth_headers, db):
+        """Test adding to existing stock"""
+        # Create initial stock
+        stock = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        db.add(stock)
+        db.commit()
+
+        stock_data = {
+            "gtin": "1234567890123",
+            "location": "WAREHOUSE_A",
+            "quantity": 25
+        }
+
+        response = client.post("/api/v1/stock/add", headers=auth_headers, json=stock_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["quantity"] == 75  # 50 + 25
+
+    def test_remove_stock(self, client, auth_headers, db):
+        """Test removing from existing stock"""
+        # Create initial stock
+        stock = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        db.add(stock)
+        db.commit()
+
+        stock_data = {
+            "gtin": "1234567890123",
+            "location": "WAREHOUSE_A",
+            "quantity": 15
+        }
+
+        response = client.post("/api/v1/stock/remove", headers=auth_headers, json=stock_data)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["quantity"] == 35  # 50 - 15
+
+    def test_remove_stock_insufficient(self, client, auth_headers, db):
+        """Test removing more stock than available"""
+        # Create initial stock
+        stock = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=10)
+        db.add(stock)
+        db.commit()
+
+        stock_data = {
+            "gtin": "1234567890123",
+            "location": "WAREHOUSE_A",
+            "quantity": 20
+        }
+
+        response = client.post("/api/v1/stock/remove", headers=auth_headers, json=stock_data)
+
+        assert response.status_code == 400
+        assert "Insufficient stock" in response.json()["detail"]
+
+    def test_get_stock_by_gtin(self, client, auth_headers, db):
+        """Test getting stock summary for GTIN"""
+        # Create stock in multiple locations
+        stock1 = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        stock2 = Stock(gtin="1234567890123", location="WAREHOUSE_B", quantity=25)
+        db.add_all([stock1, stock2])
+        db.commit()
+
+        response = client.get("/api/v1/stock/1234567890123", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["gtin"] == "1234567890123"
+        assert data["total_quantity"] == 75
+        assert len(data["locations"]) == 2
+
+    def test_get_total_stock(self, client, auth_headers, db):
+        """Test getting total stock for GTIN"""
+        # Create stock in multiple locations
+        stock1 = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        stock2 = Stock(gtin="1234567890123", location="WAREHOUSE_B", quantity=25)
+        db.add_all([stock1, stock2])
+        db.commit()
+
+        response = client.get("/api/v1/stock/1234567890123/total", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["gtin"] == "1234567890123"
+        assert data["total_quantity"] == 75
+        assert data["locations_count"] == 2
+
+    def test_get_all_stock(self, client, auth_headers, db):
+        """Test getting all stock entries"""
+        # Create some stock entries
+        stock1 = Stock(gtin="1234567890123", location="WAREHOUSE_A", quantity=50)
+        stock2 = Stock(gtin="9876543210987", location="WAREHOUSE_B", quantity=25)
+        db.add_all([stock1, stock2])
+        db.commit()
+
+        response = client.get("/api/v1/stock", headers=auth_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data) == 2
+
+    def test_stock_requires_auth(self, client):
+        """Test that stock endpoints require authentication"""
+        response = client.get("/api/v1/stock")
+        assert response.status_code == 403

tests/test_utils.py

@@ -1,4 +1,4 @@
-# tests/test_utils.py
+# tests/test_utils.py (Enhanced version of your existing file)
 import pytest
 from utils.data_processing import GTINProcessor, PriceProcessor
 
@@ -8,54 +8,111 @@ class TestGTINProcessor:
         self.processor = GTINProcessor()
 
     def test_normalize_valid_gtin(self):
+        """Test GTIN normalization with valid inputs"""
         # Test EAN-13
         assert self.processor.normalize("1234567890123") == "1234567890123"
 
-        # Test UPC-A
+        # Test UPC-A (12 digits)
         assert self.processor.normalize("123456789012") == "123456789012"
 
-        # Test with decimal
+        # Test with decimal point
         assert self.processor.normalize("123456789012.0") == "123456789012"
 
+        # Test EAN-8
+        assert self.processor.normalize("12345678") == "12345678"
+
     def test_normalize_invalid_gtin(self):
+        """Test GTIN normalization with invalid inputs"""
         assert self.processor.normalize("") is None
         assert self.processor.normalize(None) is None
         assert self.processor.normalize("abc") is None
-        assert self.processor.normalize("123") == "000000000123"  # Padded to 12 digits
+
+        # Test short number (gets padded)
+        assert self.processor.normalize("123") == "000000000123"
+
+    def test_normalize_gtin_with_formatting(self):
+        """Test GTIN normalization with various formatting"""
+        # Test with spaces
+        assert self.processor.normalize("123 456 789 012") == "123456789012"
+
+        # Test with dashes
+        assert self.processor.normalize("123-456-789-012") == "123456789012"
+
+        # Test with mixed formatting
+        assert self.processor.normalize("123 456-789 012") == "123456789012"
 
     def test_validate_gtin(self):
+        """Test GTIN validation"""
         assert self.processor.validate("1234567890123") is True
         assert self.processor.validate("123456789012") is True
         assert self.processor.validate("12345678") is True
         assert self.processor.validate("123") is False
         assert self.processor.validate("") is False
+        assert self.processor.validate(None) is False
+
+    def test_gtin_checksum_validation(self):
+        """Test GTIN checksum validation if implemented"""
+        # This test would verify checksum calculation if your GTINProcessor implements it
+        # For now, we'll test the structure validation
+        assert self.processor.validate("1234567890123") is True
+        assert self.processor.validate("12345678901234") is True  # 14 digits
+        assert self.processor.validate("123456789012345") is False  # 15 digits
 
 
 class TestPriceProcessor:
     def setup_method(self):
         self.processor = PriceProcessor()
 
-    def test_parse_price_currency(self):
+    def test_parse_price_currency_eur(self):
-        # Test EUR with symbol
+        """Test EUR price parsing"""
         price, currency = self.processor.parse_price_currency("8.26 EUR")
         assert price == "8.26"
         assert currency == "EUR"
 
-        # Test USD with symbol
+        # Test with euro symbol
+        price, currency = self.processor.parse_price_currency("8.26 €")
+        assert price == "8.26"
+        assert currency == "EUR"
+
+    def test_parse_price_currency_usd(self):
+        """Test USD price parsing"""
         price, currency = self.processor.parse_price_currency("$12.50")
         assert price == "12.50"
         assert currency == "USD"
 
-        # Test with comma decimal separator
+        price, currency = self.processor.parse_price_currency("12.50 USD")
-        price, currency = self.processor.parse_price_currency("8,26 €")
+        assert price == "12.50"
+        assert currency == "USD"
+
+    def test_parse_price_currency_comma_decimal(self):
+        """Test price parsing with comma as decimal separator"""
+        price, currency = self.processor.parse_price_currency("8,26 EUR")
         assert price == "8.26"
         assert currency == "EUR"
 
     def test_parse_invalid_price(self):
+        """Test invalid price parsing"""
         price, currency = self.processor.parse_price_currency("")
         assert price is None
         assert currency is None
 
         price, currency = self.processor.parse_price_currency(None)
         assert price is None
-        assert currency is None
+        assert currency is None
+
+    def test_parse_price_edge_cases(self):
+        """Test edge cases in price parsing"""
+        # Test price without currency
+        price, currency = self.processor.parse_price_currency("15.99")
+        assert price == "15.99"
+        # currency might be None or default value
+
+        # Test currency before price
+        price, currency = self.processor.parse_price_currency("EUR 25.50")
+        assert price == "25.50"
+        assert currency == "EUR"
+
+        # Test with multiple decimal places
+        price, currency = self.processor.parse_price_currency("12.999 USD")
+        assert price == "12.999"
+        assert currency == "USD"