from datetime import datetime, date
from typing import Optional
from sqlalchemy import String, Text, Date, DateTime, ForeignKey, func
from sqlalchemy.orm import Mapped, mapped_column
from app.database import Base


class LeaveRequest(Base):
    __tablename__ = "leave_requests"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    start_date: Mapped[date] = mapped_column(Date, nullable=False)
    end_date: Mapped[date] = mapped_column(Date, nullable=False)
    reason: Mapped[str] = mapped_column(Text, nullable=False)
    status: Mapped[str] = mapped_column(String(20), default="pending", nullable=False)  # pending | approved | rejected
    admin_notes: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    reviewed_by: Mapped[Optional[int]] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    reviewed_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())