import aiosqlite

from config import DB_PATH

_db: aiosqlite.Connection | None = None


async def get_db() -> aiosqlite.Connection:
    global _db
    if _db is None:
        _db = await aiosqlite.connect(DB_PATH)
    return _db


async def init_db():
    db = await get_db()
    # Tabellen folgen, sobald die ersten Features stehen.
    await db.commit()


async def close_db():
    global _db
    if _db is not None:
        await _db.close()
        _db = None


def _row_to_dict(row, cursor):
    columns = [d[0] for d in cursor.description]
    return dict(zip(columns, row))