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)
    }