from __future__ import annotations

from pathlib import Path

from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

from .config import settings


def _sqlite_url() -> str:
    db_path = Path(settings.sqlite_path)
    db_path.parent.mkdir(parents=True, exist_ok=True)
    return f"sqlite+aiosqlite:///{db_path}"


engine = create_async_engine(_sqlite_url(), future=True)
SessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)


async def get_session() -> AsyncSession:
    async with SessionLocal() as session:
        yield session


async def run_migrations() -> None:
    statements = [
        "ALTER TABLE products ADD COLUMN categoria TEXT DEFAULT ''",
        "ALTER TABLE products ADD COLUMN caducidad_estimada INTEGER DEFAULT 0",
    ]
    async with engine.begin() as conn:
        for statement in statements:
            try:
                await conn.execute(text(statement))
            except Exception:
                pass