#!/usr/bin/env python3
import argparse
import datetime
import glob
import json
import music_tag
import os
from pathlib import Path
import requests
import shutil
import sys
import youtube_dl
from ytmusicapi import YTMusic
# import musicpd

DEBUG = True

# Includes the format characters
YOUTUBE_MUSIC_URL = "https://music.youtube.com/watch?v={}"

"""
How the albums will be formatted:
{
    'id': {
        'name': '',
        'tracks': [
            {
                'id': '',
                'name': ''
            }
        ],
    }
}
"""
ALBUMS = {}


def cleanup_metadata_files(music_directory):
    files = glob.glob(os.path.join(music_directory, '*.json'))

    for file in files:
        os.remove(file)


def format_youtube_date(date):
    default = "Unknown Year"
    try:
        fmt = "%Y%m%d"
        d = datetime.datetime.strptime(date, fmt)
        return d.year
    except Exception as ex:
        print(ex)

    return default


def get_all_files(directory):
    things = glob.glob(os.path.join(directory, '*.mp3'))

    files = []

    for thing in things:
        if os.path.isfile(thing):
            files.append(thing)

    return files


def get_command_line_options():
    parser = argparse.ArgumentParser(
        description="Download songs from YouTube Music")

    parser.add_argument("url",
                        metavar="https://music.youtube.com/playlist?list=1234",
                        nargs='?',
                        default=None,
                        type=str,
                        help="Playlist or Song URL to download.")

    parser.add_argument("-c",
                        "--cookies",
                        metavar="cookiefile.txt",
                        type=str,
                        help="Cookie file to use.")

    parser.add_argument("--headers",
                        metavar="header_path",
                        type=str,
                        help="Header file to use.")

    parser.add_argument("-o",
                        "--output",
                        metavar="output_directory",
                        type=str,
                        help="Output directory to use")

    parser.add_argument("-r",
                        "--retryFile",
                        metavar="jamos_failed_urls.txt",
                        default=None,
                        type=str,
                        help="Output directory to use")

    args = parser.parse_args()

    if args.retryFile and args.url:
        print("Cannot have url and retry flag!\n")
        parser.print_help()
        raise Exception()

    if not args.retryFile and not args.url:
        print("Must pass either a url or a retry file!\n")
        parser.print_help()
        raise Exception()

    return args


def get_song_metadata_from_json(json, counter):
    metadata = {
        'title': 'unknownsong',
        'artist': 'unknownartist',
        'album': 'unknownalbum',
        'year': 1999,
        'jamos_filename': 'jamos_unknwon_file_number_{}.mp3'.format(counter),
    }

    try:
        if ('artist' in json.keys()) and (json['artist'] is not None):
            metadata['artist'] = json['artist']
            if len(metadata['artist'].split(',')) > 1:
                # If there are multiple artists, pick the first one
                # NOTE: This will break if the artist has a comma in their name
                metadata['artist'] = metadata['artist'].split(',')[0]

        if ('album' in json.keys()) and (json['album'] is not None):
            metadata['album'] = json['album']

        if ('title' in json.keys()) and (json['title'] is not None):
            metadata['title'] = json['title']

        if ('release_date' in json.keys() and
                json['release_date'] is not None):
            metadata['year'] = format_youtube_date(json['release_date'])

        artist_for_filename = metadata['artist'].replace(' ', '_').lower()
        title_for_filename = metadata['title'].replace(' ', '_').lower()
        metadata['jamos_filename'] = '{}_{}.mp3'.format(artist_for_filename,
                                                        title_for_filename)

    except Exception as ex:
        print(ex)

    return metadata


def create_downloader(music_directory, cookies):
    audio_options = {
        'format': 'mp3/bestaudio/best',
        'cookiefile': cookies,
        'outtmpl': os.path.join(music_directory, '%(id)s.%(ext)s'),
        'postprocessors': [
            {
                'key': 'FFmpegExtractAudio',
                'preferredcodec': 'mp3',
                'preferredquality': '192',
            },
            {'key': 'FFmpegMetadata'},
        ],
        # 'writeinfojson': True,
        'quiet': not DEBUG
    }

    return youtube_dl.YoutubeDL(audio_options)


def get_video_urls_in_playlist(playlist_url, ytdl):
    videos = ytdl.extract_info(playlist_url, download=False)

    urls = []
    for vid in videos['entries']:
        if 'webpage_url' in vid.keys() and vid['webpage_url'] is not None:
            urls.append(vid['webpage_url'])

    return urls


def move_file(file, metadata, output_directory):
    artist = remove_special_characters_for_filename(metadata['artist'])
    album = remove_special_characters_for_filename(metadata['album'])
    title = remove_special_characters_for_filename(metadata['title'])

    final_directory = os.path.join(
        output_directory,
        artist,
        album)

    Path(final_directory).mkdir(parents=True, exist_ok=True)

    # TODO: Research converting to mp3 instead of just naming it such.
    # TODO: Research better file formats over mp3?
    os.rename(
        file,
        os.path.join(final_directory, '{}_{}_{}.mp3'.format(artist,
                                                            album,
                                                            title)))


def save_urls_from_playlist_to_file(filename, urls):
    try:
        f = open(filename, "a")
        for url in urls:
            f.writelines(url + '\n')
        f.close()
    except Exception as e:
        print(e)
        raise e


def remove_special_characters_for_filename(filename):
    special_chars = [
        ['-', ' '],
        ['(', ''],
        [')', ''],
        ['/', ' '],
        ['/', ' '],
        [' ', '_'],
        ["'", ''],
        ["&", 'and'],
        [chr(8217), ''],
        ['$', 's'],
        ['.', '']
    ]
    new_name = filename

    for char_set in special_chars:
        new_name = new_name.replace(char_set[0], char_set[1])

    return new_name.lower()


def write_metadata_to_song_file(filename, metadata):
    file = music_tag.load_file(filename)

    file['name'] = metadata['title']
    file['artist'] = metadata['artist']
    file['album'] = metadata['album']
    file['year'] = metadata['year']

    file.save()


def create_youtube_music_api_object(header_path):
    return YTMusic(header_path)


def save_album(app, album_id):
    raw_album = app.get_album(album_id)
    # TODO: Add thumbnail_url
    ALBUMS[album_id] = {
        'name': raw_album['title'],
        'tracks': [{'title': song['title'], 'id': song['videoId'],
                    'track_num': index + 1}
                   for index, song in enumerate(raw_album['tracks'])],
        'year': raw_album['year'],
    }

    # TODO: Add get_thumbnail
    thumbnail_url = raw_album['thumbnails'][-1]['url']
    r = requests.get(thumbnail_url, stream=True)
    filename = './thumbnails/' + album_id + '.jpg'

    if not os.path.isfile(filename):
        # Check if the image was retrieved successfully
        if r.status_code == 200:
            # Set decode_content value to True,
            # otherwise the downloaded image file's size will be zero.
            r.raw.decode_content = True

            # Open a local file with wb ( write binary ) permission.
            with open(filename, 'wb') as f:
                shutil.copyfileobj(r.raw, f)

            print('Image sucessfully Downloaded: ', filename)
        else:
            print('Image Couldn\'t be retreived')

    ALBUMS[album_id]['thumbnail_filepath'] = filename


def save_debug_data(filename, data, debug=True):
    if debug:
        with open(filename, 'w') as f:
            f.write(data)


def parse_songs(app, all_raw_song_data):
    all_parsed_songs = []
    for raw_song in all_raw_song_data:
        song_id = raw_song['videoId']
        album_id = raw_song['album']['id']
        if album_id not in ALBUMS.keys():
            save_album(app, album_id)

        album = ALBUMS[album_id]

        track_num = None
        for track in ALBUMS[album_id]['tracks']:
            if track['id'] == song_id:
                track_num = track['track_num']

        parsed_song = {
            'id': raw_song['videoId'],
            'title': raw_song['title'],
            'artists': [artist['name'] for artist in raw_song['artists']],
            'album': album['name'],
            'track': track_num,
            'url': YOUTUBE_MUSIC_URL.format(raw_song['videoId']),
            'year': album['year'],
            'thumbnail_filepath': album['thumbnail_filepath']
        }
        all_parsed_songs.append(parsed_song)

    save_debug_data('parsed_album_data.json', json.dumps(ALBUMS),
                    debug=DEBUG)
    save_debug_data('parsed_song_data.json', json.dumps(all_parsed_songs),
                    debug=DEBUG)

    return all_parsed_songs


def get_library_songs(app, song_limit, order='a_to_z'):
    all_raw_song_data = app.get_library_songs(limit=song_limit, order=order)

    save_debug_data('raw_song_data.json', json.dumps(all_raw_song_data),
                    debug=DEBUG)

    all_parsed_songs = parse_songs(app, all_raw_song_data)

    return all_parsed_songs


def stuff():
    # TODO: Can you use the cookies from YTMusic here
    # cookies = os.path.join(os.path.expanduser("~"), "cookies.txt")
    cookies = './cookies.txt'
    ytdl = create_downloader(music_directory, cookies)

    failed_songs = []
    for song in []:
        try:
            ytdl.extract_info(song['url'], download=True)
        except Exception as ex:
            print(ex)
            print("Could not download: {}".format((song)))
            failed_songs.append(song)

    failed_songs = []

    for song in all_songs:
        try:
            print("Downloading: {} - {} - {} from {}...".format(
                song['title'], song['artist'], song['album'], song['url']),
                  end='')
            ytdl.extract_info(song['url'], download=True)
            sys.exit()
            print("Done.")
        except Exception as ex:
            print(ex)
            print("Could not download: {}".format((song['url'])))
            failed_songs.append(song)

    files = get_all_files(music_directory)

    counter = 1
    for f in files:
        try:
            print("Adding metadata to {} ...".format(f), end="")
            with open(f.replace('.mp3', '.info.json')) as json_file:
                json_data = json.load(json_file)
                metadata = get_song_metadata_from_json(json_data, counter)
                write_metadata_to_song_file(f, metadata)
                print("Done")
            print("Moving file...", end="")
            move_file(f, metadata, music_directory)
            print("Done")
            counter += 1
        except Exception as e:
            # just gonna print this and move on to the next file.
            print(e)

    print("Cleaning up JSON files...", end='')
    cleanup_metadata_files(music_directory)
    print("Done.")


# TODO: Implement
def retry_downloading_songs():
    # try:
    #     if len(failed_urls) > 1:
    #         print("Saving failed urls to txt file.")
    #         save_urls_from_playlist_to_file(
    #             os.path.join(music_directory, "jamos_failed_urls.txt"),
    #             failed_urls)
    #     elif args.retryFile:
    #        # Just because we don't have any failed urls in this run, doesn't
    #        # mean that we can get rid of the retry file. We'll only remove it
    #         # if it's been explicitly tried and we have no failed urls.

    #        # We've successfully downloaded all of the previously failed urls.
    #         # Delete the file
    #         os.remove(args.retryFile)
    # except Exception as ex:
    #     print(ex)
    #     print("Saving failed urls to file failed! Printing failed urls:")
    #     for url in failed_urls:
    #         print(url)
    print("Not Implemented Yet!")
    sys.exit()


# TODO: Implement
def handle_downloading_playlist():
    print("Not Implemented Yet!")
    sys.exit()
    pass


def sanitize_for_filename(filename):
    new_filename = filename.replace(' ', '_')
    new_filename = (''.join(
            [s for s in new_filename if s.isalnum() or s == '_'])).lower()
    return new_filename


if __name__ == "__main__":
    try:
        args = get_command_line_options()
    except Exception as ex:
        print(ex)
        sys.exit()

    music_directory = args.output or os.path.join(os.path.expanduser("~"),
                                                  "Music")
    cookies = args.cookies or os.path.join(os.path.expanduser("~"),
                                           "cookies.txt")

    app = create_youtube_music_api_object(args.headers)

    all_songs = get_library_songs(app, 5000)

    # From some testing, if your playlist is public, you don't have to use a
    # cookie file. Youtube-dl doesn't break or throw if the file doesn't exist.
    ytdl = create_downloader(music_directory, cookies)

    for song in all_songs:
        # download song
        ytdl.extract_info(song['url'], download=True)

        # get filename song was downloaded to
        filenames = glob.glob(os.path.join(music_directory, song['id'] + '.*'))
        filename = filenames[0]

        # tag basic data
        file = music_tag.load_file(filename)
        file['name'] = song['title']
        file['artist'] = song['artists'][0]
        file['albumartist'] = song['artists'][0]
        file['album'] = song['album']
        file['tracknumber'] = song['track']
        file['year'] = song['year']

        # include album cover
        try:
            with open(song['thumbnail_filepath'], 'rb') as img_in:
                file['artwork'] = img_in.read()
        except Exception as ex:
            print(ex)

        # save music tag data
        file.save()

        # move song to music_directory/artist/album/artist_album_title.ext
        # excluding non filesafe characters

        artist_for_filename = sanitize_for_filename(
            song['artists'][0].replace('$', 's'))  # exception for $uicideboy$
        album_for_filename = sanitize_for_filename(song['album'])
        title_for_filename = sanitize_for_filename(song['title'])
        song_output_dir = os.path.join(music_directory,
                                       artist_for_filename,
                                       album_for_filename)
        Path(song_output_dir).mkdir(parents=True, exist_ok=True)
        new_filename = '{}_{}_{}.mp3'.format(artist_for_filename,
                                             album_for_filename,
                                             title_for_filename)
        shutil.move(filename, os.path.join(song_output_dir, new_filename))