import json
from pathlib import Path


def get_connection_string(name="FirstSolutionDB", settings_path=None):
    """Load connection string from appsettings.json in the parent project."""
    if settings_path is None:
        local_settings = Path(__file__).resolve().parents[1] / "appsettings.json"
        settings_path = local_settings if local_settings.exists() else Path(__file__).resolve().parents[2] / "appsettings.json"
    else:
        settings_path = Path(settings_path)

    data = json.loads(settings_path.read_text(encoding="utf-8"))
    conn_strings = data.get("ConnectionStrings", {})
    if name not in conn_strings:
        raise KeyError(f"Connection string '{name}' not found in {settings_path}")
    return conn_strings[name]