# FILE: src/apps/sales/models/contract_line_item.py
from __future__ import annotations

import uuid
from decimal import Decimal
from typing import TYPE_CHECKING, Optional
from uuid import UUID

from sqlalchemy import ForeignKey, Integer, Numeric, String, text
from sqlalchemy.dialects.postgresql import UUID as PG_UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from src.database.base import Base

if TYPE_CHECKING:
    from src.apps.sales.models.contract import Contract


class ContractLineItem(Base):
    __tablename__ = "contract_line_items"

    id: Mapped[UUID] = mapped_column(
        PG_UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
        server_default=text("gen_random_uuid()"),
    )
    contract_id: Mapped[UUID] = mapped_column(
        PG_UUID(as_uuid=True),
        ForeignKey("contracts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    tenant_id: Mapped[UUID] = mapped_column(
        PG_UUID(as_uuid=True),
        ForeignKey("accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )

    description: Mapped[str] = mapped_column(String(500), nullable=False)
    fee_type: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    quantity: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    unit_price: Mapped[Decimal] = mapped_column(Numeric(10, 2), nullable=False)
    line_total: Mapped[Decimal] = mapped_column(Numeric(12, 2), nullable=False)

    # Relationships
    contract: Mapped["Contract"] = relationship(
        "Contract", back_populates="line_items"
    )