from datetime import datetime
from decimal import Decimal

from sqlalchemy import DateTime, ForeignKey, Integer, JSON, Numeric, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class ReceiptLineItem(Base):
    __tablename__ = "receipt_line_items"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    document_id: Mapped[int] = mapped_column(ForeignKey("documents.id"), nullable=False, index=True)

    line_index: Mapped[int | None] = mapped_column(Integer, nullable=True)
    raw_description: Mapped[str] = mapped_column(Text, nullable=False)
    normalized_description: Mapped[str | None] = mapped_column(Text, nullable=True)

    quantity: Mapped[Decimal | None] = mapped_column(Numeric(12, 3), nullable=True)
    unit_price: Mapped[Decimal | None] = mapped_column(Numeric(12, 2), nullable=True)
    line_total: Mapped[Decimal | None] = mapped_column(Numeric(12, 2), nullable=True)

    item_category: Mapped[str | None] = mapped_column(String(64), nullable=True)
    confidence: Mapped[Decimal | None] = mapped_column(Numeric(5, 2), nullable=True)
    extra_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=datetime.utcnow,
        onupdate=datetime.utcnow,
        nullable=False,
    )

    document: Mapped["Document"] = relationship(back_populates="receipt_line_items")