import uuid
from datetime import datetime
from decimal import Decimal

from sqlalchemy import DateTime, ForeignKey, Integer, Numeric, UniqueConstraint, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base_class import Base


class ContractFee(Base):
    __tablename__ = "contract_fees"
    __table_args__ = (
        UniqueConstraint("project_id", "center_id", name="uq_contract_fees_project_center"),
    )

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    project_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
    center_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("sites.id"), index=True, nullable=False)
    contract_amount: Mapped[Decimal] = mapped_column(Numeric(12, 2), nullable=False)
    contract_cases: Mapped[int] = mapped_column(Integer, nullable=False)
    actual_cases: Mapped[int | None] = mapped_column(Integer, nullable=True)
    settlement_amount: Mapped[Decimal | None] = mapped_column(Numeric(12, 2), nullable=True)
    final_payment_amount: Mapped[Decimal | None] = mapped_column(Numeric(12, 2), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )