from datetime import UTC, datetime
from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.core.database import Base


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    email: Mapped[str] = mapped_column(String(255), unique=True, index=True, nullable=False)
    full_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
    role: Mapped[str] = mapped_column(String(255), nullable=False)
    is_admin: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    department_id: Mapped[int | None] = mapped_column(
        ForeignKey("departments.id", ondelete="SET NULL"),
        nullable=True,
    )
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, default=lambda: datetime.now(UTC), nullable=False
    )
    department = relationship("Department", back_populates="users")

    @property
    def department_name(self) -> str | None:
        if self.department is None:
            return None
        return self.department.name