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

if TYPE_CHECKING:
    from app.models.user import User


class OAuthIdentity(Base):
    __tablename__ = "oauth_identities"
    __table_args__ = (
        UniqueConstraint("provider", "provider_subject", name="uq_oauth_identities_provider_subject"),
        Index("ix_oauth_identities_user_id", "user_id"),
    )

    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
    )
    provider: Mapped[str] = mapped_column(String(20), nullable=False)
    provider_subject: Mapped[str] = mapped_column(String(255), nullable=False)
    provider_email_at_link: Mapped[str] = mapped_column(String(255), nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )

    user: Mapped["User"] = relationship("User", backref="oauth_identities")