from datetime import date, datetime
from decimal import Decimal
from sqlalchemy import JSON, Date, DateTime, ForeignKey, Integer, Numeric, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class DocumentLineItemVersionItem(Base):
    __tablename__ = "document_line_item_version_items"

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

    line_number: Mapped[int] = mapped_column(Integer, nullable=False)
    entry_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    quantity: Mapped[Decimal | None] = mapped_column(Numeric(18, 4), nullable=True)
    unit_price: Mapped[Decimal | None] = mapped_column(Numeric(18, 4), nullable=True)
    line_total: Mapped[Decimal | None] = mapped_column(Numeric(18, 4), nullable=True)
    tax_amount: Mapped[Decimal | None] = mapped_column(Numeric(18, 4), nullable=True)
    category: Mapped[str | None] = mapped_column(String(100), nullable=True)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    raw_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)

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

    set_version: Mapped["DocumentLineItemSetVersion"] = relationship(back_populates="items")