from datetime import datetime

from sqlalchemy import (Boolean, Column, DateTime, Float, ForeignKey, Index,
                        Integer, String, Text, UniqueConstraint)
from sqlalchemy.orm import relationship

# Import Base from the central database module instead of creating a new one
from app.core.database import Base


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}')>"
        )