from __future__ import unicode_literals

import json
import re

from .common import InfoExtractor

from ..compat import compat_str
from ..utils import (
    int_or_none,
    try_get,
)


class TEDIE(InfoExtractor):
    IE_NAME = 'ted'
    _VALID_URL = r'''(?x)
        (?P<proto>https?://)
        (?P<type>www|embed(?:-ssl)?)(?P<urlmain>\.ted\.com/
        (
            (?P<type_playlist>playlists(?:/\d+)?) # We have a playlist
            |
            ((?P<type_talk>talks)) # We have a simple talk
            |
            (?P<type_watch>watch)/[^/]+/[^/]+
        )
        (/lang/(.*?))? # The url may contain the language
        /(?P<name>[\w-]+) # Here goes the name and then ".html"
        .*)$
        '''
    _TESTS = [{
        'url': 'http://www.ted.com/talks/dan_dennett_on_our_consciousness.html',
        'md5': '0de43ac406aa3e4ea74b66c9c7789b13',
        'info_dict': {
            'id': '102',
            'ext': 'mp4',
            'title': 'The illusion of consciousness',
            'description': ('Philosopher Dan Dennett makes a compelling '
                            'argument that not only don\'t we understand our own '
                            'consciousness, but that half the time our brains are '
                            'actively fooling us.'),
            'uploader': 'Dan Dennett',
            'width': 853,
            'duration': 1308,
        }
    }, {
        'url': 'http://www.ted.com/watch/ted-institute/ted-bcg/vishal-sikka-the-beauty-and-power-of-algorithms',
        'md5': 'b899ac15e345fb39534d913f7606082b',
        'info_dict': {
            'id': 'tSVI8ta_P4w',
            'ext': 'mp4',
            'title': 'Vishal Sikka: The beauty and power of algorithms',
            'thumbnail': r're:^https?://.+\.jpg',
            'description': 'md5:6261fdfe3e02f4f579cbbfc00aff73f4',
            'upload_date': '20140122',
            'uploader_id': 'TEDInstitute',
            'uploader': 'TED Institute',
        },
        'add_ie': ['Youtube'],
    }, {
        'url': 'http://www.ted.com/talks/gabby_giffords_and_mark_kelly_be_passionate_be_courageous_be_your_best',
        'md5': '71b3ab2f4233012dce09d515c9c39ce2',
        'info_dict': {
            'id': '1972',
            'ext': 'mp4',
            'title': 'Be passionate. Be courageous. Be your best.',
            'uploader': 'Gabby Giffords and Mark Kelly',
            'description': 'md5:5174aed4d0f16021b704120360f72b92',
            'duration': 1128,
        },
    }, {
        'url': 'http://www.ted.com/playlists/who_are_the_hackers',
        'info_dict': {
            'id': '10',
            'title': 'Who are the hackers?',
        },
        'playlist_mincount': 6,
    }, {
        # contains a youtube video
        'url': 'https://www.ted.com/talks/douglas_adams_parrots_the_universe_and_everything',
        'add_ie': ['Youtube'],
        'info_dict': {
            'id': '_ZG8HBuDjgc',
            'ext': 'webm',
            'title': 'Douglas Adams: Parrots the Universe and Everything',
            'description': 'md5:01ad1e199c49ac640cb1196c0e9016af',
            'uploader': 'University of California Television (UCTV)',
            'uploader_id': 'UCtelevision',
            'upload_date': '20080522',
        },
        'params': {
            'skip_download': True,
        },
    }, {
        # YouTube video
        'url': 'http://www.ted.com/talks/jeffrey_kluger_the_sibling_bond',
        'add_ie': ['Youtube'],
        'info_dict': {
            'id': 'aFBIPO-P7LM',
            'ext': 'mp4',
            'title': 'The hidden power of siblings: Jeff Kluger at TEDxAsheville',
            'description': 'md5:3d7a4f50d95ca5dd67104e2a20f43fe1',
            'uploader': 'TEDx Talks',
            'uploader_id': 'TEDxTalks',
            'upload_date': '20111216',
        },
        'params': {
            'skip_download': True,
        },
    }]

    _NATIVE_FORMATS = {
        'low': {'width': 320, 'height': 180},
        'medium': {'width': 512, 'height': 288},
        'high': {'width': 854, 'height': 480},
    }

    def _extract_info(self, webpage):
        info_json = self._search_regex(
            r'(?s)q\(\s*"\w+.init"\s*,\s*({.+})\)\s*</script>',
            webpage, 'info json')
        return json.loads(info_json)

    def _real_extract(self, url):
        m = re.match(self._VALID_URL, url, re.VERBOSE)
        if m.group('type').startswith('embed'):
            desktop_url = m.group('proto') + 'www' + m.group('urlmain')
            return self.url_result(desktop_url, 'TED')
        name = m.group('name')
        if m.group('type_talk'):
            return self._talk_info(url, name)
        elif m.group('type_watch'):
            return self._watch_info(url, name)
        else:
            return self._playlist_videos_info(url, name)

    def _playlist_videos_info(self, url, name):
        '''Returns the videos of the playlist'''

        webpage = self._download_webpage(url, name,
                                         'Downloading playlist webpage')
        info = self._extract_info(webpage)

        playlist_info = try_get(
            info, lambda x: x['__INITIAL_DATA__']['playlist'],
            dict) or info['playlist']

        playlist_entries = [
            self.url_result('http://www.ted.com/talks/' + talk['slug'], self.ie_key())
            for talk in try_get(
                info, lambda x: x['__INITIAL_DATA__']['talks'],
                dict) or info['talks']
        ]
        return self.playlist_result(
            playlist_entries,
            playlist_id=compat_str(playlist_info['id']),
            playlist_title=playlist_info['title'])

    def _talk_info(self, url, video_name):
        webpage = self._download_webpage(url, video_name)

        info = self._extract_info(webpage)

        talk_info = try_get(
            info, lambda x: x['__INITIAL_DATA__']['talks'][0],
            dict) or info['talks'][0]

        title = talk_info['title'].strip()

        external = talk_info.get('external')
        if external:
            service = external['service']
            self.to_screen('Found video from %s' % service)
            ext_url = None
            if service.lower() == 'youtube':
                ext_url = external.get('code')
            return {
                '_type': 'url',
                'url': ext_url or external['uri'],
            }

        native_downloads = try_get(
            talk_info, lambda x: x['downloads']['nativeDownloads'],
            dict) or talk_info['nativeDownloads']

        formats = [{
            'url': format_url,
            'format_id': format_id,
            'format': format_id,
        } for (format_id, format_url) in native_downloads.items() if format_url is not None]
        if formats:
            for f in formats:
                finfo = self._NATIVE_FORMATS.get(f['format_id'])
                if finfo:
                    f.update(finfo)

        player_talk = talk_info['player_talks'][0]

        resources_ = player_talk.get('resources') or talk_info.get('resources')

        http_url = None
        for format_id, resources in resources_.items():
            if format_id == 'h264':
                for resource in resources:
                    h264_url = resource.get('file')
                    if not h264_url:
                        continue
                    bitrate = int_or_none(resource.get('bitrate'))
                    formats.append({
                        'url': h264_url,
                        'format_id': '%s-%sk' % (format_id, bitrate),
                        'tbr': bitrate,
                    })
                    if re.search(r'\d+k', h264_url):
                        http_url = h264_url
            elif format_id == 'rtmp':
                streamer = talk_info.get('streamer')
                if not streamer:
                    continue
                for resource in resources:
                    formats.append({
                        'format_id': '%s-%s' % (format_id, resource.get('name')),
                        'url': streamer,
                        'play_path': resource['file'],
                        'ext': 'flv',
                        'width': int_or_none(resource.get('width')),
                        'height': int_or_none(resource.get('height')),
                        'tbr': int_or_none(resource.get('bitrate')),
                    })
            elif format_id == 'hls':
                formats.extend(self._extract_m3u8_formats(
                    resources.get('stream'), video_name, 'mp4', m3u8_id=format_id, fatal=False))

        m3u8_formats = list(filter(
            lambda f: f.get('protocol') == 'm3u8' and f.get('vcodec') != 'none',
            formats))
        if http_url:
            for m3u8_format in m3u8_formats:
                bitrate = self._search_regex(r'(\d+k)', m3u8_format['url'], 'bitrate', default=None)
                if not bitrate:
                    continue
                f = m3u8_format.copy()
                f.update({
                    'url': re.sub(r'\d+k', bitrate, http_url),
                    'format_id': m3u8_format['format_id'].replace('hls', 'http'),
                    'protocol': 'http',
                })
                formats.append(f)

        audio_download = talk_info.get('audioDownload')
        if audio_download:
            formats.append({
                'url': audio_download,
                'format_id': 'audio',
                'vcodec': 'none',
            })

        self._sort_formats(formats)

        video_id = compat_str(talk_info['id'])

        return {
            'id': video_id,
            'title': title,
            'uploader': player_talk.get('speaker') or talk_info.get('speaker'),
            'thumbnail': player_talk.get('thumb') or talk_info.get('thumb'),
            'description': self._og_search_description(webpage),
            'subtitles': self._get_subtitles(video_id, talk_info),
            'formats': formats,
            'duration': talk_info.get('duration'),
        }

    def _get_subtitles(self, video_id, talk_info):
        sub_lang_list = {}
        for language in try_get(
                talk_info,
                (lambda x: x['downloads']['languages'],
                 lambda x: x['languages']), list):
            lang_code = language.get('languageCode') or language.get('ianaCode')
            if not lang_code:
                continue
            sub_lang_list[lang_code] = [
                {
                    'url': 'http://www.ted.com/talks/subtitles/id/%s/lang/%s/format/%s' % (video_id, lang_code, ext),
                    'ext': ext,
                }
                for ext in ['ted', 'srt']
            ]
        return sub_lang_list

    def _watch_info(self, url, name):
        webpage = self._download_webpage(url, name)

        config_json = self._html_search_regex(
            r'"pages\.jwplayer"\s*,\s*({.+?})\s*\)\s*</script>',
            webpage, 'config', default=None)
        if not config_json:
            embed_url = self._search_regex(
                r"<iframe[^>]+class='pages-video-embed__video__object'[^>]+src='([^']+)'", webpage, 'embed url')
            return self.url_result(self._proto_relative_url(embed_url))
        config = json.loads(config_json)['config']
        video_url = config['video']['url']
        thumbnail = config.get('image', {}).get('url')

        title = self._html_search_regex(
            r"(?s)<h1(?:\s+class='[^']+')?>(.+?)</h1>", webpage, 'title')
        description = self._html_search_regex(
            [
                r'(?s)<h4 class="[^"]+" id="h3--about-this-talk">.*?</h4>(.*?)</div>',
                r'(?s)<p><strong>About this talk:</strong>\s+(.*?)</p>',
            ],
            webpage, 'description', fatal=False)

        return {
            'id': name,
            'url': video_url,
            'title': title,
            'thumbnail': thumbnail,
            'description': description,
        }
