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#!/usr/bin/env python3
import datetime
import glob
import json
import music_tag
import os
from os.path import isfile, join
from pathlib import Path
import readline
import youtube_dl


# MUSIC_DIRECTORY = "~/Music/"
MUSIC_DIRECTORY = "./music/"

COMMANDS = ['extra', 'extension', 'stuff', 'errors',
            'email', 'foobar', 'foo']
FILES = []
DIRECTORIES = []

AUDIO_OPTIONS = {
        'format': 'bestaudio/best',
        'cookiefile': 'cookies.txt',
        'outtmpl': MUSIC_DIRECTORY + '%(title)s.%(ext)s',
        'postprocessors': [
            {'key': 'FFmpegExtractAudio','preferredcodec': 'mp3',
             'preferredquality': '192',
            },
            {'key': 'FFmpegMetadata'},
        ],
        'writeinfojson': True
    }

ytdl = youtube_dl.YoutubeDL(AUDIO_OPTIONS)


# TODO: Pull via command line args
def get_playlist_url():
    # return "https://music.youtube.com/watch?v=Enm0XL7xx_E&feature=share" # Deer Tick
    # return "https://music.youtube.com/watch?v=hJLb0zPBzkE&feature=share" # You Worry Me
    # return "https://music.youtube.com/playlist?list=OLAK5uy_lHnMUbm8pKsyMTRQNCrjM2v4CPvIJUWq0&feature=share" # Button the busker
    # return "https://music.youtube.com/playlist?list=PLC-Ro2Hd9eWm1ZPIAsxFcfg2JoOlTO0Oj&feature=share" # broken hearts and dirty windows volume 2
    # return "https://music.youtube.com/playlist?list=PLC-Ro2Hd9eWkX4hDamDvyB5G-vxLTEBKl&feature=share" # dev playlist
    return "https://music.youtube.com/playlist?list=PLC-Ro2Hd9eWkoElrTZIcCVCcdxBQzojsZ&feature=share" # missing playlist


def download_song(song_url):
    """
    Download a song using youtube url and song title
    """
    return ytdl.extract_info(song_url, download=True)


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

    f['name'] = metadata['title']
    f['artist'] = metadata['artist']
    f['album'] = metadata['album']
    f['year'] = format_youtube_date(metadata['release_date'])

    f.save()

def format_youtube_date(date):
    fmt = "%Y%m%d"
    d = datetime.datetime.strptime(date, fmt)
    return d.year

def sort_stuff():
    # read in all the files and directories to move
    get_all_files()

    # setup tab completion
    readline.parse_and_bind("tab: complete")
    readline.set_completer(complete)

    in_directory = False

    # loop over all the files left and
    print(len(FILES))
    for f in FILES:
        in_directory = False
        while not in_directory:
            print(f)
            directory = input('Enter directory: ')
            if directory in DIRECTORIES:
                move_file(directory, f)
                in_directory = True
            if directory == "refresh":
                get_directories()


def complete(text, state):
    for cmd in DIRECTORIES:
        if cmd.startswith(text):
            if not state:
                return cmd
            else:
                state -= 1


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_directories():
    files = os.listdir()
    global DIRECTORIES

    for f in files:
        if os.path.isdir(f):
            DIRECTORIES.append(f)


def move_file(file, metadata):
    p = os.path.join(MUSIC_DIRECTORY, metadata['artist'].replace(' ', '_').lower(), metadata['album'].replace(' ', '_').lower())
    Path(p).mkdir( parents=True, exist_ok=True )

    os.rename(file, os.path.join(p, metadata['artist'].replace(' ', '_').lower() + '_' + metadata['title'].replace(' ', '_').lower() + '.mp3'))



if __name__ == "__main__":
    # Get the playlist url from the command line
    playlist_url = get_playlist_url()

    # Download the songs
    download_song(playlist_url)

    files = get_all_files(MUSIC_DIRECTORY)

    for f in files:
        json_data = None
        with open(f.replace('.mp3', '.info.json')) as json_file:
            json_data = json.load(json_file)
            write_metadata_to_song_file(f, json_data)
        move_file(f, json_data)