import uuid
from datetime import datetime, date

from sqlalchemy import Date, DateTime, ForeignKey, Numeric, String, Text, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base_class import Base


class FinanceItem(Base):
    __tablename__ = "finance_items"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    study_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
    site_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("sites.id"), index=True, nullable=True)
    subject_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("subjects.id"), index=True, nullable=True)
    visit_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), nullable=True)
    category: Mapped[str] = mapped_column(String(50), nullable=False)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    currency: Mapped[str] = mapped_column(String(10), nullable=False, default="CNY")
    amount: Mapped[float] = mapped_column(Numeric(12, 2), nullable=False)
    occur_date: Mapped[date] = mapped_column(Date, nullable=False)
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="DRAFT")
    submitted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    approved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    rejected_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    paid_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    approver_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    payer_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    reject_reason: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    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()
    )