from collections.abc import AsyncGenerator

from fastapi import Depends
from fastapi_users.db import (
    SQLAlchemyBaseOAuthAccountTableUUID,
    SQLAlchemyBaseUserTableUUID,
    SQLAlchemyUserDatabase,
)
from sqlalchemy import String
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import Mapped, mapped_column, relationship

from media_manager.config import MediaManagerConfig
from media_manager.database import Base, build_db_url


class OAuthAccount(SQLAlchemyBaseOAuthAccountTableUUID, Base):
    access_token: Mapped[str] = mapped_column(String(length=4096), nullable=False)
    refresh_token: Mapped[str | None] = mapped_column(
        String(length=4096), nullable=True
    )


class User(SQLAlchemyBaseUserTableUUID, Base):
    oauth_accounts: Mapped[list[OAuthAccount]] = relationship(
        "OAuthAccount", lazy="joined"
    )


engine = create_async_engine(
    build_db_url(**MediaManagerConfig().database.model_dump()), echo=False
)
async_session_maker = async_sessionmaker(engine, expire_on_commit=False)


async def get_async_session() -> AsyncGenerator[AsyncSession]:
    async with async_session_maker() as session:
        yield session


async def get_user_db(
    session: AsyncSession = Depends(get_async_session),
) -> AsyncGenerator[SQLAlchemyUserDatabase]:
    yield SQLAlchemyUserDatabase(session, User, OAuthAccount)