import sys
import os
from pathlib import Path
from configparser import ConfigParser

config = None


def load_config(config_abs):
    global config

    if not os.path.exists(config_abs):
        print(f"Could not find config file: {config_abs}")
        sys.exit(1)

    config = ConfigParser()
    config.read(config_abs)

    assert list(config.keys()) == ['DEFAULT', 'mpd', 'download_dirs', 'debug', 'http', 'proxy', 'threadpool', 'deezer', 'youtubedl', 'nextcloud', 'nextcloud_ssh_scan_files'], f"Validating config file failed. Check {config_abs}"

    if config['mpd'].getboolean('use_mpd'):
        if not config['mpd']['music_dir_root'].startswith(config['download_dirs']['base']):
            print("ERROR: base download dir must be a subdirectory of the mpd music_dir_root")
            sys.exit(1)

    if not Path(config['youtubedl']['command']).exists():
        print(f"ERROR: yt-dlp not found at {config['youtubedl']['command']}")
        sys.exit(1)

    proxy_server = config['proxy']['server']
    if len(proxy_server) > 0:
        if not proxy_server.startswith("https://") and \
           not proxy_server.startswith("socks5"): # there is also socks5h
            print(f"ERROR: invalid proxy server address: {config['proxy']['server']}")
            sys.exit(1)

    if "DEEZER_COOKIE_ARL" in os.environ.keys():
        config["deezer"]["cookie_arl"] = os.environ["DEEZER_COOKIE_ARL"]

    if len(config["deezer"]["cookie_arl"].strip()) == 0:
        print("ERROR: cookie_arl must not be empty")
        sys.exit(1)

    if "DEEZER_QUALITY" in os.environ.keys():
        config["deezer"]["quality"] = os.environ["DEEZER_QUALITY"]
        
    if "quality" in config['deezer']:
        if config['deezer']["quality"] not in ("mp3", "flac"):
            print("ERROR: quality must be mp3 or flac in config file")
            sys.exit(1)
    else:
        print("Warning: quality not set in config file. Using mp3")
        config["deezer"]["quality"] = "mp3"