from __future__ import unicode_literals

import re
import socket

from .common import InfoExtractor
from ..compat import (
    compat_etree_fromstring,
    compat_http_client,
    compat_urllib_error,
    compat_urllib_parse_unquote,
    compat_urllib_parse_unquote_plus,
)
from ..utils import (
    error_to_compat_str,
    ExtractorError,
    int_or_none,
    limit_length,
    sanitized_Request,
    urlencode_postdata,
    get_element_by_id,
    clean_html,
)


class FacebookIE(InfoExtractor):
    _VALID_URL = r'''(?x)
                (?:
                    https?://
                        (?:[\w-]+\.)?facebook\.com/
                        (?:[^#]*?\#!/)?
                        (?:
                            (?:
                                video/video\.php|
                                photo\.php|
                                video\.php|
                                video/embed|
                                story\.php
                            )\?(?:.*?)(?:v|video_id|story_fbid)=|
                            [^/]+/videos/(?:[^/]+/)?|
                            [^/]+/posts/|
                            groups/[^/]+/permalink/
                        )|
                    facebook:
                )
                (?P<id>[0-9]+)
                '''
    _LOGIN_URL = 'https://www.facebook.com/login.php?next=http%3A%2F%2Ffacebook.com%2Fhome.php&login_attempt=1'
    _CHECKPOINT_URL = 'https://www.facebook.com/checkpoint/?next=http%3A%2F%2Ffacebook.com%2Fhome.php&_fb_noscript=1'
    _NETRC_MACHINE = 'facebook'
    IE_NAME = 'facebook'

    _CHROME_USER_AGENT = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.97 Safari/537.36'

    _VIDEO_PAGE_TEMPLATE = 'https://www.facebook.com/video/video.php?v=%s'

    _TESTS = [{
        'url': 'https://www.facebook.com/video.php?v=637842556329505&fref=nf',
        'md5': '6a40d33c0eccbb1af76cf0485a052659',
        'info_dict': {
            'id': '637842556329505',
            'ext': 'mp4',
            'title': 're:Did you know Kei Nishikori is the first Asian man to ever reach a Grand Slam',
            'uploader': 'Tennis on Facebook',
            'upload_date': '20140908',
            'timestamp': 1410199200,
        }
    }, {
        'note': 'Video without discernible title',
        'url': 'https://www.facebook.com/video.php?v=274175099429670',
        'info_dict': {
            'id': '274175099429670',
            'ext': 'mp4',
            'title': 'Facebook video #274175099429670',
            'uploader': 'Asif Nawab Butt',
            'upload_date': '20140506',
            'timestamp': 1399398998,
        },
        'expected_warnings': [
            'title'
        ]
    }, {
        'note': 'Video with DASH manifest',
        'url': 'https://www.facebook.com/video.php?v=957955867617029',
        'md5': 'b2c28d528273b323abe5c6ab59f0f030',
        'info_dict': {
            'id': '957955867617029',
            'ext': 'mp4',
            'title': 'When you post epic content on instagram.com/433 8 million followers, this is ...',
            'uploader': 'Demy de Zeeuw',
            'upload_date': '20160110',
            'timestamp': 1452431627,
        },
    }, {
        'url': 'https://www.facebook.com/maxlayn/posts/10153807558977570',
        'md5': '037b1fa7f3c2d02b7a0d7bc16031ecc6',
        'info_dict': {
            'id': '544765982287235',
            'ext': 'mp4',
            'title': '"What are you doing running in the snow?"',
            'uploader': 'FailArmy',
        },
        'skip': 'Video gone',
    }, {
        'url': 'https://m.facebook.com/story.php?story_fbid=1035862816472149&id=116132035111903',
        'md5': '1deb90b6ac27f7efcf6d747c8a27f5e3',
        'info_dict': {
            'id': '1035862816472149',
            'ext': 'mp4',
            'title': 'What the Flock Is Going On In New Zealand  Credit: ViralHog',
            'uploader': 'S. Saint',
        },
        'skip': 'Video gone',
    }, {
        'note': 'swf params escaped',
        'url': 'https://www.facebook.com/barackobama/posts/10153664894881749',
        'md5': '97ba073838964d12c70566e0085c2b91',
        'info_dict': {
            'id': '10153664894881749',
            'ext': 'mp4',
            'title': 'Facebook video #10153664894881749',
        },
    }, {
        # have 1080P, but only up to 720p in swf params
        'url': 'https://www.facebook.com/cnn/videos/10155529876156509/',
        'md5': '0d9813160b146b3bc8744e006027fcc6',
        'info_dict': {
            'id': '10155529876156509',
            'ext': 'mp4',
            'title': 'Holocaust survivor becomes US citizen',
            'timestamp': 1477818095,
            'upload_date': '20161030',
            'uploader': 'CNN',
        },
    }, {
        'url': 'https://www.facebook.com/video.php?v=10204634152394104',
        'only_matching': True,
    }, {
        'url': 'https://www.facebook.com/amogood/videos/1618742068337349/?fref=nf',
        'only_matching': True,
    }, {
        'url': 'https://www.facebook.com/ChristyClarkForBC/videos/vb.22819070941/10153870694020942/?type=2&theater',
        'only_matching': True,
    }, {
        'url': 'facebook:544765982287235',
        'only_matching': True,
    }, {
        'url': 'https://www.facebook.com/groups/164828000315060/permalink/764967300301124/',
        'only_matching': True,
    }, {
        'url': 'https://zh-hk.facebook.com/peoplespower/videos/1135894589806027/',
        'only_matching': True,
    }]

    @staticmethod
    def _extract_url(webpage):
        mobj = re.search(
            r'<iframe[^>]+?src=(["\'])(?P<url>https://www\.facebook\.com/video/embed.+?)\1', webpage)
        if mobj is not None:
            return mobj.group('url')

        # Facebook API embed
        # see https://developers.facebook.com/docs/plugins/embedded-video-player
        mobj = re.search(r'''(?x)<div[^>]+
                class=(?P<q1>[\'"])[^\'"]*\bfb-(?:video|post)\b[^\'"]*(?P=q1)[^>]+
                data-href=(?P<q2>[\'"])(?P<url>(?:https?:)?//(?:www\.)?facebook.com/.+?)(?P=q2)''', webpage)
        if mobj is not None:
            return mobj.group('url')

    def _login(self):
        (useremail, password) = self._get_login_info()
        if useremail is None:
            return

        login_page_req = sanitized_Request(self._LOGIN_URL)
        self._set_cookie('facebook.com', 'locale', 'en_US')
        login_page = self._download_webpage(login_page_req, None,
                                            note='Downloading login page',
                                            errnote='Unable to download login page')
        lsd = self._search_regex(
            r'<input type="hidden" name="lsd" value="([^"]*)"',
            login_page, 'lsd')
        lgnrnd = self._search_regex(r'name="lgnrnd" value="([^"]*?)"', login_page, 'lgnrnd')

        login_form = {
            'email': useremail,
            'pass': password,
            'lsd': lsd,
            'lgnrnd': lgnrnd,
            'next': 'http://facebook.com/home.php',
            'default_persistent': '0',
            'legacy_return': '1',
            'timezone': '-60',
            'trynum': '1',
        }
        request = sanitized_Request(self._LOGIN_URL, urlencode_postdata(login_form))
        request.add_header('Content-Type', 'application/x-www-form-urlencoded')
        try:
            login_results = self._download_webpage(request, None,
                                                   note='Logging in', errnote='unable to fetch login page')
            if re.search(r'<form(.*)name="login"(.*)</form>', login_results) is not None:
                error = self._html_search_regex(
                    r'(?s)<div[^>]+class=(["\']).*?login_error_box.*?\1[^>]*><div[^>]*>.*?</div><div[^>]*>(?P<error>.+?)</div>',
                    login_results, 'login error', default=None, group='error')
                if error:
                    raise ExtractorError('Unable to login: %s' % error, expected=True)
                self._downloader.report_warning('unable to log in: bad username/password, or exceeded login rate limit (~3/min). Check credentials or wait.')
                return

            fb_dtsg = self._search_regex(
                r'name="fb_dtsg" value="(.+?)"', login_results, 'fb_dtsg', default=None)
            h = self._search_regex(
                r'name="h"\s+(?:\w+="[^"]+"\s+)*?value="([^"]+)"', login_results, 'h', default=None)

            if not fb_dtsg or not h:
                return

            check_form = {
                'fb_dtsg': fb_dtsg,
                'h': h,
                'name_action_selected': 'dont_save',
            }
            check_req = sanitized_Request(self._CHECKPOINT_URL, urlencode_postdata(check_form))
            check_req.add_header('Content-Type', 'application/x-www-form-urlencoded')
            check_response = self._download_webpage(check_req, None,
                                                    note='Confirming login')
            if re.search(r'id="checkpointSubmitButton"', check_response) is not None:
                self._downloader.report_warning('Unable to confirm login, you have to login in your browser and authorize the login.')
        except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
            self._downloader.report_warning('unable to log in: %s' % error_to_compat_str(err))
            return

    def _real_initialize(self):
        self._login()

    def _extract_from_url(self, url, video_id, fatal_if_no_video=True):
        req = sanitized_Request(url)
        req.add_header('User-Agent', self._CHROME_USER_AGENT)
        webpage = self._download_webpage(req, video_id)

        video_data = None

        server_js_data = self._parse_json(self._search_regex(
            r'handleServerJS\(({.+})(?:\);|,")', webpage, 'server js data', default='{}'), video_id)
        for item in server_js_data.get('instances', []):
            if item[1][0] == 'VideoConfig':
                video_item = item[2][0]
                if video_item.get('video_id') == video_id:
                    video_data = video_item['videoData']
                    break

        if not video_data:
            if not fatal_if_no_video:
                return webpage, False
            m_msg = re.search(r'class="[^"]*uiInterstitialContent[^"]*"><div>(.*?)</div>', webpage)
            if m_msg is not None:
                raise ExtractorError(
                    'The video is not available, Facebook said: "%s"' % m_msg.group(1),
                    expected=True)
            elif '>You must log in to continue' in webpage:
                self.raise_login_required()
            else:
                raise ExtractorError('Cannot parse data')

        formats = []
        for f in video_data:
            format_id = f['stream_type']
            if f and isinstance(f, dict):
                f = [f]
            if not f or not isinstance(f, list):
                continue
            for quality in ('sd', 'hd'):
                for src_type in ('src', 'src_no_ratelimit'):
                    src = f[0].get('%s_%s' % (quality, src_type))
                    if src:
                        preference = -10 if format_id == 'progressive' else 0
                        if quality == 'hd':
                            preference += 5
                        formats.append({
                            'format_id': '%s_%s_%s' % (format_id, quality, src_type),
                            'url': src,
                            'preference': preference,
                        })
            dash_manifest = f[0].get('dash_manifest')
            if dash_manifest:
                formats.extend(self._parse_mpd_formats(
                    compat_etree_fromstring(compat_urllib_parse_unquote_plus(dash_manifest))))
        if not formats:
            raise ExtractorError('Cannot find video formats')

        self._sort_formats(formats)

        video_title = self._html_search_regex(
            r'<h2\s+[^>]*class="uiHeaderTitle"[^>]*>([^<]*)</h2>', webpage, 'title',
            default=None)
        if not video_title:
            video_title = self._html_search_regex(
                r'(?s)<span class="fbPhotosPhotoCaption".*?id="fbPhotoPageCaption"><span class="hasCaption">(.*?)</span>',
                webpage, 'alternative title', default=None)
            video_title = limit_length(video_title, 80)
        if not video_title:
            video_title = 'Facebook video #%s' % video_id
        uploader = clean_html(get_element_by_id('fbPhotoPageAuthorName', webpage))
        timestamp = int_or_none(self._search_regex(
            r'<abbr[^>]+data-utime=["\'](\d+)', webpage,
            'timestamp', default=None))

        info_dict = {
            'id': video_id,
            'title': video_title,
            'formats': formats,
            'uploader': uploader,
            'timestamp': timestamp,
        }

        return webpage, info_dict

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

        real_url = self._VIDEO_PAGE_TEMPLATE % video_id if url.startswith('facebook:') else url
        webpage, info_dict = self._extract_from_url(real_url, video_id, fatal_if_no_video=False)

        if info_dict:
            return info_dict

        if '/posts/' in url:
            entries = [
                self.url_result('facebook:%s' % vid, FacebookIE.ie_key())
                for vid in self._parse_json(
                    self._search_regex(
                        r'(["\'])video_ids\1\s*:\s*(?P<ids>\[.+?\])',
                        webpage, 'video ids', group='ids'),
                    video_id)]

            return self.playlist_result(entries, video_id)
        else:
            _, info_dict = self._extract_from_url(
                self._VIDEO_PAGE_TEMPLATE % video_id,
                video_id, fatal_if_no_video=True)
            return info_dict


class FacebookPluginsVideoIE(InfoExtractor):
    _VALID_URL = r'https?://(?:[\w-]+\.)?facebook\.com/plugins/video\.php\?.*?\bhref=(?P<id>https.+)'

    _TESTS = [{
        'url': 'https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fgov.sg%2Fvideos%2F10154383743583686%2F&show_text=0&width=560',
        'md5': '5954e92cdfe51fe5782ae9bda7058a07',
        'info_dict': {
            'id': '10154383743583686',
            'ext': 'mp4',
            'title': 'What to do during the haze?',
            'uploader': 'Gov.sg',
            'upload_date': '20160826',
            'timestamp': 1472184808,
        },
        'add_ie': [FacebookIE.ie_key()],
    }, {
        'url': 'https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fvideo.php%3Fv%3D10204634152394104',
        'only_matching': True,
    }, {
        'url': 'https://www.facebook.com/plugins/video.php?href=https://www.facebook.com/gov.sg/videos/10154383743583686/&show_text=0&width=560',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        return self.url_result(
            compat_urllib_parse_unquote(self._match_id(url)),
            FacebookIE.ie_key())