import uuid
from datetime import datetime, date
from decimal import Decimal
from sqlalchemy import String, Text, Integer, TIMESTAMP, Date, Numeric, Boolean, ForeignKey, text
from sqlalchemy.dialects.postgresql import UUID, ARRAY
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.core.database import Base


class Product(Base):
    __tablename__ = "products"
    __table_args__ = {"schema": "shopping"}

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(150), nullable=False)
    brand: Mapped[str | None] = mapped_column(String(100))
    category: Mapped[str | None] = mapped_column(String(50))
    description: Mapped[str | None] = mapped_column(Text)
    image_path: Mapped[str | None] = mapped_column(String(255))
    thumbnail_path: Mapped[str | None] = mapped_column(String(255))
    default_unit: Mapped[str | None] = mapped_column(String(20))
    barcode: Mapped[str | None] = mapped_column(String(50))
    price: Mapped[Decimal | None] = mapped_column(Numeric(8, 2))
    quantity_per_unit: Mapped[Decimal | None] = mapped_column(Numeric(8, 3))
    default_store_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.stores.id", ondelete="SET NULL"))
    frequency_score: Mapped[int] = mapped_column(Integer, server_default=text("0"))
    last_purchased_at: Mapped[date | None] = mapped_column(Date)
    avg_interval_days: Mapped[Decimal | None] = mapped_column(Numeric(8, 1))
    tags: Mapped[list[str] | None] = mapped_column(ARRAY(Text()), nullable=True)
    owner_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=text("now()"))


class Store(Base):
    __tablename__ = "stores"
    __table_args__ = {"schema": "shopping"}

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    location: Mapped[str | None] = mapped_column(Text)
    url: Mapped[str | None] = mapped_column(Text)
    store_type: Mapped[str | None] = mapped_column(String(50))
    owner_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))


class PriceHistory(Base):
    __tablename__ = "price_history"
    __table_args__ = {"schema": "shopping"}

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    product_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.products.id", ondelete="CASCADE"), nullable=False)
    store_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.stores.id", ondelete="SET NULL"))
    price: Mapped[Decimal] = mapped_column(Numeric(8, 2), nullable=False)
    unit: Mapped[str | None] = mapped_column(String(20))
    quantity: Mapped[Decimal | None] = mapped_column(Numeric(8, 3))
    source: Mapped[str] = mapped_column(String(20), server_default="manual")
    recorded_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=text("now()"))


class ShoppingList(Base):
    __tablename__ = "lists"
    __table_args__ = {"schema": "shopping"}

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str | None] = mapped_column(String(100))
    store_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.stores.id", ondelete="SET NULL"))
    week_date: Mapped[date | None] = mapped_column(Date)
    status: Mapped[str] = mapped_column(String(20), server_default="draft")
    owner_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    created_at: Mapped[datetime] = mapped_column(TIMESTAMP(timezone=True), server_default=text("now()"))

    items: Mapped[list["ListItem"]] = relationship("ListItem", back_populates="shopping_list", cascade="all, delete-orphan")


class ListItem(Base):
    __tablename__ = "list_items"
    __table_args__ = {"schema": "shopping"}

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    list_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.lists.id", ondelete="CASCADE"), nullable=False)
    product_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("shopping.products.id", ondelete="SET NULL"))
    custom_name: Mapped[str | None] = mapped_column(String(150))
    quantity: Mapped[Decimal | None] = mapped_column(Numeric(8, 3))
    unit: Mapped[str | None] = mapped_column(String(20))
    is_checked: Mapped[bool] = mapped_column(Boolean, server_default=text("false"))
    price_recorded: Mapped[Decimal | None] = mapped_column(Numeric(8, 2))
    carried_over: Mapped[bool] = mapped_column(Boolean, server_default=text("false"))
    sort_order: Mapped[int | None] = mapped_column(Integer)

    shopping_list: Mapped["ShoppingList"] = relationship("ShoppingList", back_populates="items")
    product: Mapped["Product | None"] = relationship("Product", lazy="select")