from collections.abc import AsyncGenerator
from typing import Annotated

from fastapi import Depends
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

from src.core.config import settings


class Base(DeclarativeBase):
    pass


engine = create_async_engine(
    settings.database_url,
    echo=settings.echo_sql,
)

SessionLocal = async_sessionmaker(engine, expire_on_commit=False)


async def get_session() -> AsyncGenerator[AsyncSession]:  # pragma: no cover
    async with SessionLocal() as session:
        yield session


SessionDep = Annotated[AsyncSession, Depends(get_session)]


async def init_database() -> None:  # pragma: no cover
    """Creates tables if they don't exist (non-destructive)."""
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def reinit_database() -> None:  # pragma: no cover
    """Drops and recreates all tables (destructive)."""
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
        await conn.run_sync(Base.metadata.create_all)