from pathlib import Path
from dataclasses import dataclass
from argparse import ArgumentParser
from typing import List
from os import getenv
from sys import argv
from xdg.BaseDirectory import xdg_cache_home
from json import loads


@dataclass
class Config:
    cache_file: Path = Path(xdg_cache_home) / Path("spotify-shortcuts.json")
    client_id: str | None = None
    client_secret: str | None = None
    notifications: bool = True

    @staticmethod
    def from_file(path: Path):
        if not path.exists():
            raise FileNotFoundError(f"Configuration file {path} does not exist.")
        with open(path, "r") as f:
            data = loads(f.read())

        return Config(
            cache_file=Path(data.get("cacheFile", Config.cache_file)),
            client_id=data.get("clientId", Config.client_id),
            client_secret=data.get("clientSecret", Config.client_secret),
        )


def load_config(args: List[str] = argv[1:]) -> Config:
    parser = ArgumentParser(description="Spotify CLI Tool")
    parser.add_argument(
        "--cache-file",
        type=Path,
        default=Config.cache_file,
        help="Path to the cache file for Spotify authentication",
    )
    parser.add_argument(
        "--client-id",
        type=str,
        default=Config.client_id,
        help="Spotify API Client ID",
    )
    parser.add_argument(
        "--client-secret",
        type=str,
        default=Config.client_secret,
        help="Spotify API Client Secret",
    )
    parser.add_argument(
        "--config-file",
        type=str,
        help="Path to a json configuration file with keys clientId and clientSecret",
    )
    parser.add_argument(
        "--no-notifications",
        action="store_true",
        help="Disable desktop notifications",
    )

    ns = parser.parse_args(args)

    cfg = Config()
    if (cfg_file := ns.config_file or getenv("SPOTIFY_SHORTCUTS_CONFIG", None)) != None:
        cfg = Config.from_file(Path(cfg_file))

    return Config(
        cache_file=ns.cache_file or cfg.cache_file,
        client_id=ns.client_id or cfg.client_id,
        client_secret=ns.client_secret or cfg.client_secret,
        notifications=not ns.no_notifications or cfg.notifications,
    )