import secrets
import uuid
from datetime import datetime, timedelta, timezone

from sqlalchemy import DateTime, ForeignKey, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from ..database import Base

TOKEN_TTL_HOURS = 24


class EmailVerificationToken(Base):
    __tablename__ = "email_verification_tokens"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
    )
    token: Mapped[str] = mapped_column(Text, nullable=False, unique=True)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    used_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    @staticmethod
    def make(user_id: uuid.UUID) -> "EmailVerificationToken":
        return EmailVerificationToken(
            user_id=user_id,
            token=secrets.token_urlsafe(32),
            expires_at=datetime.now(timezone.utc) + timedelta(hours=TOKEN_TTL_HOURS),
        )