import re
import json
import itertools
import socket

from .common import InfoExtractor
from .subtitles import SubtitlesIE

from ..utils import (
    compat_http_client,
    compat_urllib_error,
    compat_urllib_request,
    compat_str,
    get_element_by_attribute,
    get_element_by_id,

    ExtractorError,
)


class DailyMotionSubtitlesIE(SubtitlesIE):

    def _get_available_subtitles(self, video_id):
        request = compat_urllib_request.Request('https://api.dailymotion.com/video/%s/subtitles?fields=id,language,url' % video_id)
        try:
            sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
        except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
            self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
            return {}
        info = json.loads(sub_list)
        if (info['total'] > 0):
            sub_lang_list = dict((l['language'], l['url']) for l in info['list'])
            return sub_lang_list
        self._downloader.report_warning(u'video doesn\'t have subtitles')
        return {}

    def _get_subtitle_url(self, sub_lang, sub_name, video_id, format):
        sub_lang_list = self._get_available_subtitles(video_id)
        return sub_lang_list[sub_lang]

    def _request_automatic_caption(self, video_id, webpage):
        self._downloader.report_warning(u'Automatic Captions not supported by dailymotion')
        return {}


class DailymotionIE(DailyMotionSubtitlesIE): #,InfoExtractor):
    """Information Extractor for Dailymotion"""

    _VALID_URL = r'(?i)(?:https?://)?(?:www\.)?dailymotion\.[a-z]{2,3}/video/([^/]+)'
    IE_NAME = u'dailymotion'
    _TEST = {
        u'url': u'http://www.dailymotion.com/video/x33vw9_tutoriel-de-youtubeur-dl-des-video_tech',
        u'file': u'x33vw9.mp4',
        u'md5': u'392c4b85a60a90dc4792da41ce3144eb',
        u'info_dict': {
            u"uploader": u"Alex and Van .",
            u"title": u"Tutoriel de Youtubeur\"DL DES VIDEO DE YOUTUBE\""
        }
    }

    def _real_extract(self, url):
        # Extract id and simplified title from URL
        mobj = re.match(self._VALID_URL, url)

        video_id = mobj.group(1).split('_')[0].split('?')[0]

        video_extension = 'mp4'

        # Retrieve video webpage to extract further information
        request = compat_urllib_request.Request(url)
        request.add_header('Cookie', 'family_filter=off')
        webpage = self._download_webpage(request, video_id)

        # Extract URL, uploader and title from webpage
        self.report_extraction(video_id)

        video_uploader = self._search_regex([r'(?im)<span class="owner[^\"]+?">[^<]+?<a [^>]+?>([^<]+?)</a>',
                                             # Looking for official user
                                             r'<(?:span|a) .*?rel="author".*?>([^<]+?)</'],
                                            webpage, 'video uploader')

        video_upload_date = None
        mobj = re.search(r'<div class="[^"]*uploaded_cont[^"]*" title="[^"]*">([0-9]{2})-([0-9]{2})-([0-9]{4})</div>', webpage)
        if mobj is not None:
            video_upload_date = mobj.group(3) + mobj.group(2) + mobj.group(1)

        embed_url = 'http://www.dailymotion.com/embed/video/%s' % video_id
        embed_page = self._download_webpage(embed_url, video_id,
                                            u'Downloading embed page')
        info = self._search_regex(r'var info = ({.*?}),', embed_page, 'video info')
        info = json.loads(info)

        # TODO: support choosing qualities

        for key in ['stream_h264_hd1080_url', 'stream_h264_hd_url',
                    'stream_h264_hq_url', 'stream_h264_url',
                    'stream_h264_ld_url']:
            if info.get(key):  # key in info and info[key]:
                max_quality = key
                self.to_screen(u'%s: Using %s' % (video_id, key))
                break
        else:
            raise ExtractorError(u'Unable to extract video URL')
        video_url = info[max_quality]

        # subtitles
        video_subtitles = None
        video_webpage = None

        if self._downloader.params.get('writesubtitles', False) or self._downloader.params.get('allsubtitles', False):
            video_subtitles = self._extract_subtitles(video_id)
        elif self._downloader.params.get('writeautomaticsub', False):
            video_subtitles = self._request_automatic_caption(video_id, video_webpage)

        if self._downloader.params.get('listsubtitles', False):
            self._list_available_subtitles(video_id)
            return

        if 'length_seconds' not in info:
            self._downloader.report_warning(u'unable to extract video duration')
            video_duration = ''
        else:
            video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])

        return [{
            'id':       video_id,
            'url':      video_url,
            'uploader': video_uploader,
            'upload_date':  video_upload_date,
            'title':    self._og_search_title(webpage),
            'ext':      video_extension,
            'subtitles':    video_subtitles,
            'thumbnail': info['thumbnail_url']
        }]