# coding: utf-8
from __future__ import unicode_literals

import re
import hashlib

from .common import InfoExtractor
from ..compat import (
    compat_str,
    compat_urllib_parse,
)
from ..utils import (
    ExtractorError,
    int_or_none,
    float_or_none,
    sanitized_Request,
)


class YandexMusicBaseIE(InfoExtractor):
    @staticmethod
    def _handle_error(response):
        error = response.get('error')
        if error:
            raise ExtractorError(error, expected=True)

    def _download_json(self, *args, **kwargs):
        response = super(YandexMusicBaseIE, self)._download_json(*args, **kwargs)
        self._handle_error(response)
        return response


class YandexMusicTrackIE(YandexMusicBaseIE):
    IE_NAME = 'yandexmusic:track'
    IE_DESC = 'Яндекс.Музыка - Трек'
    _VALID_URL = r'https?://music\.yandex\.(?:ru|kz|ua|by)/album/(?P<album_id>\d+)/track/(?P<id>\d+)'

    _TEST = {
        'url': 'http://music.yandex.ru/album/540508/track/4878838',
        'md5': 'f496818aa2f60b6c0062980d2e00dc20',
        'info_dict': {
            'id': '4878838',
            'ext': 'mp3',
            'title': 'Carlo Ambrosio - Gypsy Eyes 1',
            'filesize': 4628061,
            'duration': 193.04,
        }
    }

    def _get_track_url(self, storage_dir, track_id):
        data = self._download_json(
            'http://music.yandex.ru/api/v1.5/handlers/api-jsonp.jsx?action=getTrackSrc&p=download-info/%s'
            % storage_dir,
            track_id, 'Downloading track location JSON')

        key = hashlib.md5(('XGRlBW9FXlekgbPrRHuSiA' + data['path'][1:] + data['s']).encode('utf-8')).hexdigest()
        storage = storage_dir.split('.')

        return ('http://%s/get-mp3/%s/%s?track-id=%s&from=service-10-track&similarities-experiment=default'
                % (data['host'], key, data['ts'] + data['path'], storage[1]))

    def _get_track_info(self, track):
        thumbnail = None
        cover_uri = track.get('albums', [{}])[0].get('coverUri')
        if cover_uri:
            thumbnail = cover_uri.replace('%%', 'orig')
            if not thumbnail.startswith('http'):
                thumbnail = 'http://' + thumbnail
        return {
            'id': track['id'],
            'ext': 'mp3',
            'url': self._get_track_url(track['storageDir'], track['id']),
            'title': '%s - %s' % (track['artists'][0]['name'], track['title']),
            'filesize': int_or_none(track.get('fileSize')),
            'duration': float_or_none(track.get('durationMs'), 1000),
            'thumbnail': thumbnail,
        }

    def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        album_id, track_id = mobj.group('album_id'), mobj.group('id')

        track = self._download_json(
            'http://music.yandex.ru/handlers/track.jsx?track=%s:%s' % (track_id, album_id),
            track_id, 'Downloading track JSON')['track']

        return self._get_track_info(track)


class YandexMusicPlaylistBaseIE(YandexMusicBaseIE):
    def _build_playlist(self, tracks):
        return [
            self.url_result(
                'http://music.yandex.ru/album/%s/track/%s' % (track['albums'][0]['id'], track['id']))
            for track in tracks if track.get('albums') and isinstance(track.get('albums'), list)]


class YandexMusicAlbumIE(YandexMusicPlaylistBaseIE):
    IE_NAME = 'yandexmusic:album'
    IE_DESC = 'Яндекс.Музыка - Альбом'
    _VALID_URL = r'https?://music\.yandex\.(?:ru|kz|ua|by)/album/(?P<id>\d+)/?(\?|$)'

    _TEST = {
        'url': 'http://music.yandex.ru/album/540508',
        'info_dict': {
            'id': '540508',
            'title': 'Carlo Ambrosio - Gypsy Soul (2009)',
        },
        'playlist_count': 50,
    }

    def _real_extract(self, url):
        album_id = self._match_id(url)

        album = self._download_json(
            'http://music.yandex.ru/handlers/album.jsx?album=%s' % album_id,
            album_id, 'Downloading album JSON')

        entries = self._build_playlist(album['volumes'][0])

        title = '%s - %s' % (album['artists'][0]['name'], album['title'])
        year = album.get('year')
        if year:
            title += ' (%s)' % year

        return self.playlist_result(entries, compat_str(album['id']), title)


class YandexMusicPlaylistIE(YandexMusicPlaylistBaseIE):
    IE_NAME = 'yandexmusic:playlist'
    IE_DESC = 'Яндекс.Музыка - Плейлист'
    _VALID_URL = r'https?://music\.yandex\.(?:ru|kz|ua|by)/users/[^/]+/playlists/(?P<id>\d+)'

    _TESTS = [{
        'url': 'http://music.yandex.ru/users/music.partners/playlists/1245',
        'info_dict': {
            'id': '1245',
            'title': 'Что слушают Enter Shikari',
            'description': 'md5:3b9f27b0efbe53f2ee1e844d07155cc9',
        },
        'playlist_count': 6,
    }, {
        # playlist exceeding the limit of 150 tracks shipped with webpage (see
        # https://github.com/rg3/youtube-dl/issues/6666)
        'url': 'https://music.yandex.ru/users/ya.playlist/playlists/1036',
        'info_dict': {
            'id': '1036',
            'title': 'Музыка 90-х',
        },
        'playlist_count': 310,
    }]

    def _real_extract(self, url):
        playlist_id = self._match_id(url)

        webpage = self._download_webpage(url, playlist_id)

        mu = self._parse_json(
            self._search_regex(
                r'var\s+Mu\s*=\s*({.+?});\s*</script>', webpage, 'player'),
            playlist_id)

        playlist = mu['pageData']['playlist']
        tracks, track_ids = playlist['tracks'], playlist['trackIds']

        # tracks dictionary shipped with webpage is limited to 150 tracks,
        # missing tracks should be retrieved manually.
        if len(tracks) < len(track_ids):
            present_track_ids = set([compat_str(track['id']) for track in tracks if track.get('id')])
            missing_track_ids = set(map(compat_str, track_ids)) - set(present_track_ids)
            request = sanitized_Request(
                'https://music.yandex.ru/handlers/track-entries.jsx',
                compat_urllib_parse.urlencode({
                    'entries': ','.join(missing_track_ids),
                    'lang': mu.get('settings', {}).get('lang', 'en'),
                    'external-domain': 'music.yandex.ru',
                    'overembed': 'false',
                    'sign': mu.get('authData', {}).get('user', {}).get('sign'),
                    'strict': 'true',
                }).encode('utf-8'))
            request.add_header('Referer', url)
            request.add_header('X-Requested-With', 'XMLHttpRequest')

            missing_tracks = self._download_json(
                request, playlist_id, 'Downloading missing tracks JSON', fatal=False)
            if missing_tracks:
                tracks.extend(missing_tracks)

        return self.playlist_result(
            self._build_playlist(tracks),
            compat_str(playlist_id),
            playlist['title'], playlist.get('description'))
