import uuid
from datetime import datetime, timezone
from typing import Optional
from sqlalchemy import String, DateTime, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.dialects.postgresql import UUID
from app.core.database import Base


class EmailVerificationToken(Base):
    __tablename__ = "email_verification_tokens"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4
    )
    token_hash: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id"),
        nullable=False,
        index=True
    )
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    used_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc)
    )

    @property
    def is_used(self) -> bool:
        return self.used_at is not None

    @property
    def is_expired(self) -> bool:
        return datetime.now(timezone.utc) > self.expires_at

    @property
    def is_valid(self) -> bool:
        return not self.is_used and not self.is_expired