from typing import AsyncGenerator
from fastapi import Depends
from fastapi_users.db import SQLAlchemyUserDatabase
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine, async_session
from apps.users.models import Base, User
from settings import config

POSTGRES_SERVER = config.POSTGRES_SERVER
POSTGRES_USER = config.POSTGRES_USER
POSTGRES_PASSWORD = config.POSTGRES_PASSWORD
POSTGRES_DB = config.POSTGRES_DB
SQLALCHEMY_DATABASE_URL = f"postgresql+asyncpg://{POSTGRES_USER}:{POSTGRES_PASSWORD}@{POSTGRES_SERVER}/{POSTGRES_DB}"
engine = create_async_engine(SQLALCHEMY_DATABASE_URL)
async_session_maker = async_sessionmaker(engine, expire_on_commit=False)


async def create_db_and_tables():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
    async with async_session_maker() as session:
        yield session


async def get_user_db(session: AsyncSession = Depends(get_async_session)):
    yield SQLAlchemyUserDatabase(session, User)


async def get_db_session() -> AsyncSession:
    async with async_session() as session:
        yield session