import os
from os.path import join, exists
import requests
import mutagen.mp3
import logging
log = logging.getLogger(__name__)


def download_track(track, args):
    log.debug('Downloading "%s"' % track['title'])
    if 'album' in track:
        fdir = join(track['artist'], track['album']).replace(' ', '_')
    else:
        fdir = join(track['artist'])
    fname = track['title'].replace(' ', '_') + '.mp3'
    fpath = join(args.download_base, fdir, fname)
    os.makedirs(join(args.download_base, fdir), exist_ok=True)
    if exists(fpath):
        log.info('file %s exists, skipping' % fpath)
    log.debug('download in ' + fpath)
    resp = requests.get(track['url'], stream=True)
    if not resp.ok:
        log.error('Error downloading track ', track['title'])
        return
    with open(fpath, 'wb') as buf:
        log.debug('writing ' + fname)
        for block in resp.iter_content():
            buf.write(block)
    audio = mutagen.mp3.EasyMP3(fpath)  # TODO: is it always mp3?
    audio['title'] = track['title']
    audio['artist'] = track['artist']
    if 'album' in track:
        audio['album'] = track['album']
    audio.save()
    log.info('track %(title)s downloaded' % track)