import json
import re

from .common import InfoExtractor
from ..utils import (
    compat_str,
    compat_urlparse,
    ExtractorError,
)


class BandcampIE(InfoExtractor):
    _VALID_URL = r'http://.*?\.bandcamp\.com/track/(?P<title>.*)'
    _TESTS = [{
        u'url': u'http://youtube-dl.bandcamp.com/track/youtube-dl-test-song',
        u'file': u'1812978515.mp3',
        u'md5': u'c557841d5e50261777a6585648adf439',
        u'info_dict': {
            u"title": u"youtube-dl  \"'/\\\u00e4\u21ad - youtube-dl test song \"'/\\\u00e4\u21ad",
            u"duration": 10,
        },
        u'skip': u'There is a limit of 200 free downloads / month for the test song'
    }]

    def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        title = mobj.group('title')
        webpage = self._download_webpage(url, title)
        # We get the link to the free download page
        m_download = re.search(r'freeDownloadPage: "(.*?)"', webpage)
        if m_download is None:
            m_trackinfo = re.search(r'trackinfo: (.+),\s*?\n', webpage)
            if m_trackinfo:
                json_code = m_trackinfo.group(1)
                data = json.loads(json_code)
                d = data[0]

                duration = int(round(d['duration']))
                formats = []
                for format_id, format_url in d['file'].items():
                    ext, _, abr_str = format_id.partition('-')

                    formats.append({
                        'format_id': format_id,
                        'url': format_url,
                        'ext': format_id.partition('-')[0],
                        'vcodec': 'none',
                        'acodec': format_id.partition('-')[0],
                        'abr': int(format_id.partition('-')[2]),
                    })

                self._sort_formats(formats)

                return {
                    'id': compat_str(d['id']),
                    'title': d['title'],
                    'formats': formats,
                    'duration': duration,
                }
            else:
                raise ExtractorError(u'No free songs found')

        download_link = m_download.group(1)
        video_id = re.search(
            r'var TralbumData = {(.*?)id: (?P<id>\d*?)$',
            webpage, re.MULTILINE | re.DOTALL).group('id')

        download_webpage = self._download_webpage(download_link, video_id,
                                                  'Downloading free downloads page')
        # We get the dictionary of the track from some javascrip code
        info = re.search(r'items: (.*?),$',
                         download_webpage, re.MULTILINE).group(1)
        info = json.loads(info)[0]
        # We pick mp3-320 for now, until format selection can be easily implemented.
        mp3_info = info[u'downloads'][u'mp3-320']
        # If we try to use this url it says the link has expired
        initial_url = mp3_info[u'url']
        re_url = r'(?P<server>http://(.*?)\.bandcamp\.com)/download/track\?enc=mp3-320&fsig=(?P<fsig>.*?)&id=(?P<id>.*?)&ts=(?P<ts>.*)$'
        m_url = re.match(re_url, initial_url)
        #We build the url we will use to get the final track url
        # This url is build in Bandcamp in the script download_bunde_*.js
        request_url = '%s/statdownload/track?enc=mp3-320&fsig=%s&id=%s&ts=%s&.rand=665028774616&.vrs=1' % (m_url.group('server'), m_url.group('fsig'), video_id, m_url.group('ts'))
        final_url_webpage = self._download_webpage(request_url, id, 'Requesting download url')
        # If we could correctly generate the .rand field the url would be
        #in the "download_url" key
        final_url = re.search(r'"retry_url":"(.*?)"', final_url_webpage).group(1)

        return {
            'id': video_id,
            'title': info[u'title'],
            'ext': 'mp3',
            'vcodec': 'none',
            'url': final_url,
            'thumbnail': info[u'thumb_url'],
            'uploader': info[u'artist'],
        }


class BandcampAlbumIE(InfoExtractor):
    IE_NAME = u'Bandcamp:album'
    _VALID_URL = r'http://.*?\.bandcamp\.com/album/(?P<title>.*)'

    _TEST = {
        u'url': u'http://blazo.bandcamp.com/album/jazz-format-mixtape-vol-1',
        u'playlist': [
            {
                u'file': u'1353101989.mp3',
                u'md5': u'39bc1eded3476e927c724321ddf116cf',
                u'info_dict': {
                    u'title': u'Intro',
                }
            },
            {
                u'file': u'38097443.mp3',
                u'md5': u'1a2c32e2691474643e912cc6cd4bffaa',
                u'info_dict': {
                    u'title': u'Kero One - Keep It Alive (Blazo remix)',
                }
            },
        ],
        u'params': {
            u'playlistend': 2
        },
        u'skip': u'Bancamp imposes download limits. See test_playlists:test_bandcamp_album for the playlist test'
    }

    def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        title = mobj.group('title')
        webpage = self._download_webpage(url, title)
        tracks_paths = re.findall(r'<a href="(.*?)" itemprop="url">', webpage)
        if not tracks_paths:
            raise ExtractorError(u'The page doesn\'t contain any tracks')
        entries = [
            self.url_result(compat_urlparse.urljoin(url, t_path), ie=BandcampIE.ie_key())
            for t_path in tracks_paths]
        title = self._search_regex(r'album_title : "(.*?)"', webpage, u'title')
        return {
            '_type': 'playlist',
            'title': title,
            'entries': entries,
        }