import uuid
from datetime import datetime

from sqlalchemy import DateTime, String, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class User(Base):
    __tablename__ = "users"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    email: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
    password_hash: Mapped[str | None] = mapped_column(String(255), nullable=True)
    google_sub: Mapped[str | None] = mapped_column(String(255), unique=True, nullable=True, index=True)
    full_name: Mapped[str | None] = mapped_column(String(200), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    exam_templates: Mapped[list["ExamTemplate"]] = relationship(
        back_populates="owner",
        cascade="all, delete-orphan",
        passive_deletes=True,
    )