# models/database_models.py - Updated with Marketplace Support
from sqlalchemy import Column, Integer, String, Float, DateTime, Boolean, Text, ForeignKey, UniqueConstraint, Index
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from datetime import datetime

Base = declarative_base()


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    email = Column(String, unique=True, index=True, nullable=False)
    username = Column(String, unique=True, index=True, nullable=False)
    hashed_password = Column(String, nullable=False)
    role = Column(String, nullable=False, default="user")  # user, admin, shop_owner
    is_active = Column(Boolean, default=True, nullable=False)
    last_login = Column(DateTime, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    # Relationships
    marketplace_import_jobs = relationship("MarketplaceImportJob", back_populates="user")
    owned_shops = relationship("Shop", back_populates="owner")

    def __repr__(self):
        return f"<User(username='{self.username}', email='{self.email}', role='{self.role}')>"


class Shop(Base):
    __tablename__ = "shops"

    id = Column(Integer, primary_key=True, index=True)
    shop_code = Column(String, unique=True, index=True, nullable=False)  # e.g., "TECHSTORE", "FASHIONHUB"
    shop_name = Column(String, nullable=False)  # Display name
    description = Column(Text)
    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)

    # Contact information
    contact_email = Column(String)
    contact_phone = Column(String)
    website = Column(String)

    # Business information
    business_address = Column(Text)
    tax_number = Column(String)

    # Status
    is_active = Column(Boolean, default=True)
    is_verified = Column(Boolean, default=False)

    # Timestamps
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    owner = relationship("User", back_populates="owned_shops")
    shop_products = relationship("ShopProduct", back_populates="shop")
    marketplace_import_jobs = relationship("MarketplaceImportJob", back_populates="shop")


class Product(Base):
    __tablename__ = "products"

    id = Column(Integer, primary_key=True, index=True)
    product_id = Column(String, unique=True, index=True, nullable=False)
    title = Column(String, nullable=False)
    description = Column(String)
    link = Column(String)
    image_link = Column(String)
    availability = Column(String, index=True)  # Index for filtering
    price = Column(String)
    brand = Column(String, index=True)  # Index for filtering
    gtin = Column(String, index=True)  # Index for stock lookups
    mpn = Column(String)
    condition = Column(String)
    adult = Column(String)
    multipack = Column(Integer)
    is_bundle = Column(String)
    age_group = Column(String)
    color = Column(String)
    gender = Column(String)
    material = Column(String)
    pattern = Column(String)
    size = Column(String)
    size_type = Column(String)
    size_system = Column(String)
    item_group_id = Column(String)
    google_product_category = Column(String, index=True)  # Index for filtering
    product_type = Column(String)
    custom_label_0 = Column(String)
    custom_label_1 = Column(String)
    custom_label_2 = Column(String)
    custom_label_3 = Column(String)
    custom_label_4 = Column(String)
    additional_image_link = Column(String)
    sale_price = Column(String)
    unit_pricing_measure = Column(String)
    unit_pricing_base_measure = Column(String)
    identifier_exists = Column(String)
    shipping = Column(String)
    currency = Column(String)

    # New marketplace fields
    marketplace = Column(String, index=True, nullable=True, default="Letzshop")  # Index for marketplace filtering
    shop_name = Column(String, index=True, nullable=True)  # Index for shop filtering

    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    # Relationship to stock (one-to-many via GTIN)
    stock_entries = relationship("Stock", foreign_keys="Stock.gtin", primaryjoin="Product.gtin == Stock.gtin",
                                 viewonly=True)
    shop_products = relationship("ShopProduct", back_populates="product")

    # Additional indexes for marketplace queries
    __table_args__ = (
        Index('idx_marketplace_shop', 'marketplace', 'shop_name'),  # Composite index for marketplace+shop queries
        Index('idx_marketplace_brand', 'marketplace', 'brand'),  # Composite index for marketplace+brand queries
    )

    def __repr__(self):
        return (f"<Product(product_id='{self.product_id}', title='{self.title}', marketplace='{self.marketplace}', "
                f"shop='{self.shop_name}')>")


class ShopProduct(Base):
    __tablename__ = "shop_products"

    id = Column(Integer, primary_key=True, index=True)
    shop_id = Column(Integer, ForeignKey("shops.id"), nullable=False)
    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)

    # Shop-specific overrides (can override the main product data)
    shop_product_id = Column(String)  # Shop's internal product ID
    shop_price = Column(Float)  # Override main product price
    shop_sale_price = Column(Float)
    shop_currency = Column(String)
    shop_availability = Column(String)  # Override availability
    shop_condition = Column(String)

    # Shop-specific metadata
    is_featured = Column(Boolean, default=False)
    is_active = Column(Boolean, default=True)
    display_order = Column(Integer, default=0)

    # Inventory management
    min_quantity = Column(Integer, default=1)
    max_quantity = Column(Integer)

    # Timestamps
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    shop = relationship("Shop", back_populates="shop_products")
    product = relationship("Product", back_populates="shop_products")

    # Constraints
    __table_args__ = (
        UniqueConstraint('shop_id', 'product_id', name='uq_shop_product'),
        Index('idx_shop_product_active', 'shop_id', 'is_active'),
        Index('idx_shop_product_featured', 'shop_id', 'is_featured'),
    )


class Stock(Base):
    __tablename__ = "stock"

    id = Column(Integer, primary_key=True, index=True)
    gtin = Column(String, index=True, nullable=False)  # Foreign key relationship would be ideal
    location = Column(String, nullable=False, index=True)
    quantity = Column(Integer, nullable=False, default=0)
    reserved_quantity = Column(Integer, default=0)  # For orders being processed
    shop_id = Column(Integer, ForeignKey("shops.id"))  # Optional: shop-specific stock

    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    # Relationships
    shop = relationship("Shop")

    # Composite unique constraint to prevent duplicate GTIN-location combinations
    __table_args__ = (
        UniqueConstraint('gtin', 'location', name='uq_stock_gtin_location'),
        Index('idx_stock_gtin_location', 'gtin', 'location'),  # Composite index for efficient queries
    )

    def __repr__(self):
        return f"<Stock(gtin='{self.gtin}', location='{self.location}', quantity={self.quantity})>"


class MarketplaceImportJob(Base):
    __tablename__ = "marketplace_import_jobs"

    id = Column(Integer, primary_key=True, index=True)
    status = Column(String, nullable=False,
                    default="pending")  # pending, processing, completed, failed, completed_with_errors
    source_url = Column(String, nullable=False)
    marketplace = Column(String, nullable=False, index=True, default="Letzshop")  # Index for marketplace filtering
    shop_name = Column(String, nullable=False, index=True)  # Index for shop filtering
    shop_id = Column(Integer, ForeignKey("shops.id"), nullable=False)  # Add proper foreign key
    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)  # Foreign key to users table

    # Results
    imported_count = Column(Integer, default=0)
    updated_count = Column(Integer, default=0)
    error_count = Column(Integer, default=0)
    total_processed = Column(Integer, default=0)

    # Error handling
    error_message = Column(String)

    # Timestamps
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    started_at = Column(DateTime)
    completed_at = Column(DateTime)

    # Relationship to user
    user = relationship("User", foreign_keys=[user_id])
    shop = relationship("Shop", back_populates="marketplace_import_jobs")

    # Additional indexes for marketplace import job queries
    __table_args__ = (
        Index('idx_marketplace_import_user_marketplace', 'user_id', 'marketplace'),  # User's marketplace imports
        Index('idx_marketplace_import_shop_status', 'status'),  # Shop import status
        Index('idx_marketplace_import_shop_id', 'shop_id'),
    )

    def __repr__(self):
        return (f"<MarketplaceImportJob(id={self.id}, marketplace='{self.marketplace}', shop='{self.shop_name}', "
                f"status='{self.status}', imported={self.imported_count})>")