import argparse
import sys
import os

def getInputLink(links):
    while True:
        try:
            the_chosen_one = int(raw_input('>> Choose your number: '))
            if the_chosen_one >= 1 and the_chosen_one <= len(links):
                return links[the_chosen_one - 1]
            elif the_chosen_one == 0:
                return None
            else:
                print('Choose a valid number!')
        except ValueError:
            print('Choose a valid number!')

def trimSong(file):
    with open(file, 'r') as fin:
        data = fin.read().splitlines(True)
    with open(file, 'w') as fout:
        fout.writelines(data[1:])

def getArgs():
    parser = argparse.ArgumentParser(description='Download and convert songs \
                    from Spotify, Youtube etc.',
                                     formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    group = parser.add_mutually_exclusive_group(required=True)

    group.add_argument('-s', '--song',
                        help='download song by spotify link or name')
    group.add_argument('-l', '--list',
                        help='download songs from a file')
    group.add_argument('-u', '--username',
                        help="load user's playlists into <playlist_name>.txt")

    parser.add_argument('-n', '--no-convert', default=False,
                        help='skip the conversion process and meta-tags', action='store_true')
    parser.add_argument('-m', '--manual', default=False,
                        help='choose the song to download manually', action='store_true')
    parser.add_argument('-f', '--ffmpeg', default=False,
                        help='Use ffmpeg instead of libav for conversion. If not set defaults to libav',
                        action='store_true')
    parser.add_argument('-v', '--verbose', default=False,
                        help='show debug output', action='store_true')
    parser.add_argument('-i', '--input_ext', default='.m4a',
                        help='prefered input format .m4a or .webm (Opus)')
    parser.add_argument('-o', '--output_ext', default='.mp3',
                        help='prefered output extension .mp3 or .m4a (AAC)')

    return parser.parse_args()


def isSpotify(raw_song):
    if (len(raw_song) == 22 and raw_song.replace(" ", "%20") == raw_song) or (raw_song.find('spotify') > -1):
        return True
    else:
        return False

def generateSearchURL(song):
    URL = "https://www.youtube.com/results?sp=EgIQAQ%253D%253D&q=" + \
        song.replace(" ", "%20")
    return URL

def fixEncoding(query):
    if sys.version_info > (3, 0):
        return query
    else:
        return query.encode('utf-8')

def cleanTemp():
    for temp in os.listdir('Music/'):
        if temp.endswith('.m4a.temp'):
            os.remove('Music/' + temp)

def graceQuit():
    print('')
    print('')
    print('Exitting..')
    exit()