# coding: utf-8
from __future__ import unicode_literals

import re

from .common import InfoExtractor
from ..compat import (
    compat_kwargs,
    compat_str,
    compat_urllib_parse_urlparse,
)
from ..utils import (
    clean_html,
    dict_get,
    ExtractorError,
    get_element_by_class,
    int_or_none,
    parse_iso8601,
    str_or_none,
    strip_or_none,
    try_get,
    url_or_none,
    urlencode_postdata,
    urljoin,
)


class PlatziBaseIE(InfoExtractor):
    _LOGIN_URL = 'https://platzi.com/login/'
    _NETRC_MACHINE = 'platzi'

    def _raise_extractor_error(self, video_id, reason, expected=True):
        raise ExtractorError('[%s] %s: %s' % (self.IE_NAME, video_id, reason), expected=expected)

    def _download_webpage(self, url_or_request, video_id, *args, **kwargs):
        # CF likes Connection: keep-alive and so disfavours Py2
        # retry on 403 may get in
        kwargs['expected_status'] = 403
        # header parameters required fpor Py3 to breach site's CF fence w/o 403
        headers = kwargs.get('headers') or {}
        new_hdrs = {}
        if 'User-Agent' not in headers:
            headers['User-Agent'] = 'Mozilla/5.0'  # (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.0.0 Safari/537.36'
            kwargs['headers'] = new_hdrs = headers
        if new_hdrs:
            kwargs = compat_kwargs(kwargs)
        for _ in range(2):
            x = super(PlatziBaseIE, self)._download_webpage_handle(url_or_request, video_id, *args, **kwargs)
            if x is False:
                return x
            if x[1].getcode() != 403:
                break
            kwargs.pop('expected_status', None)
            note = kwargs.pop('note', '')
            kwargs['note'] = (note or 'Downloading webpage') + ' - retrying'
            kwargs = compat_kwargs(kwargs)
        path = compat_urllib_parse_urlparse(x[1].geturl())
        if path == '/':
            self._raise_extractor_error(video_id, 'Redirected to home page: content expired?')
        elif path =='/login':
            self.raise_login_required()
        else:
            errs = clean_html(get_element_by_class('Errorpage-text', x[0]))
            if errs:
                self._raise_extractor_error(video_id, errs)
        return x[0]

    def _real_initialize(self):
        self._login()

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

        login_page = self._download_webpage(
            self._LOGIN_URL, None, 'Downloading login page')

        login_form = self._hidden_inputs(login_page)

        login_form.update({
            'email': username,
            'password': password,
        })

        urlh = self._request_webpage(
            self._LOGIN_URL, None, 'Logging in',
            data=urlencode_postdata(login_form),
            headers={'Referer': self._LOGIN_URL})

        # login succeeded
        if 'platzi.com/login' not in urlh.geturl():
            return

        login_error = self._webpage_read_content(
            urlh, self._LOGIN_URL, None, 'Downloading login error page')

        login = self._parse_json(
            self._search_regex(
                r'login\s*=\s*({.+?})(?:\s*;|\s*</script)', login_error, 'login'),
            None)

        for kind in ('error', 'password', 'nonFields'):
            error = str_or_none(login.get('%sError' % kind))
            if error:
                raise ExtractorError(
                    'Unable to login: %s' % error, expected=True)
        raise ExtractorError('Unable to log in')


class PlatziIE(PlatziBaseIE):
    _VALID_URL = r'''(?x)
                    https?://
                        (?:
                            platzi\.com/clases|           # es version
                            courses\.platzi\.com/classes  # en version
                        )/[^/]+/(?P<id>\d+)-[^/?\#&]+
                    '''

    _TESTS = [{
        'url': 'https://platzi.com/clases/1927-intro-selenium/29383-bienvenida-al-curso',
        'md5': '0af120f1ffd18a2246f19099d52b83e2',
        'info_dict': {
            'id': '29383',
            'ext': 'mp4',
            'title': 'Por qué aprender Selenium y qué verás',
            'description': 'md5:bbe91d2760052ca4054a3149a6580436',
            'timestamp': 1627400390,
            'upload_date': '20210727',
            'creator': 'Héctor Vega',
            'series': 'Curso de Introducción a Selenium con Python',
            'duration': 11700,
            'categories': list,
        },
        'params': {
            'format': 'bestvideo',
            # 'skip_download': True,
        },
        'expected_warnings': ['HTTP Error 401']
    }, {
        'url': 'https://platzi.com/clases/1311-next-js/12074-creando-nuestra-primera-pagina/',
        'md5': '8f56448241005b561c10f11a595b37e3',
        'info_dict': {
            'id': '12074',
            'ext': 'mp4',
            'title': 'Creando nuestra primera página',
            'description': 'md5:4c866e45034fc76412fbf6e60ae008bc',
            'duration': 420,
        },
        'skip': 'Content expired',
    }, {
        'url': 'https://courses.platzi.com/classes/1367-communication-codestream/13430-background/',
        'info_dict': {
            'id': '13430',
            'ext': 'mp4',
            'title': 'Background',
            'description': 'md5:49c83c09404b15e6e71defaf87f6b305',
            'duration': 360,
        },
        'skip': 'Content expired',
    }]

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

        webpage = self._download_webpage(url, lecture_id)

        data_preloaded_state = self._parse_json(
            self._search_regex(
                (r'window\s*.\s*__PRELOADED_STATE__\s*=\s*({.*?});?\s*</script'), webpage, 'client data'),
            lecture_id)

        video_player = try_get(data_preloaded_state, lambda x: x['videoPlayer'], dict) or {}
        title = strip_or_none(video_player.get('name')) or self._og_search_title(webpage)
        servers = try_get(video_player, lambda x: x['video']['servers'], dict) or {}
        if not servers and try_get(video_player, lambda x: x['blockedInfo']['blocked']):
            why = video_player['blockedInfo'].get('type') or 'unspecified'
            if why == 'unlogged':
                self.raise_login_required()
            self._raise_extractor_error(video_id, 'All video formats blocked because ' + why)

        formats = []
        headers = {'Referer': url}
        extractions = {
            'hls': lambda x: formats.extend(self._extract_m3u8_formats(
                server_json[x], lecture_id, 'mp4',
                entry_protocol='m3u8_native', m3u8_id='hls',
                note='Downloading %s m3u8 information' % (server_json.get('id', x), ),
                headers=headers, fatal=False)),
            'dash': lambda x: formats.extend(self._extract_mpd_formats(
                server_json[x], lecture_id, mpd_id='dash',
                note='Downloading %s MPD manifest' % (server_json.get('id', x), ),
                headers=headers, fatal=False)),
        }
        for server, server_json in servers.items():
            if not isinstance(server_json, dict):
                continue
            for fmt in server_json.keys():
                extraction = extractions.get(fmt)
                if callable(extraction):
                    extraction(fmt)
        self._sort_formats(formats)
        for f in formats:
            f.setdefault('http_headers', {})['Referer'] = headers['Referer']

        def categories():
            cat = strip_or_none(video_player.get('courseCategory'))
            if cat:
                return [cat]

        return {
            'id': lecture_id,
            'title': title,
            'description': clean_html(video_player.get('courseDescription')) or self._og_search_description(webpage),
            'duration': int_or_none(video_player.get('duration'), invscale=60),
            'thumbnail': url_or_none(video_player.get('thumbnail')) or self._og_search_thumbnail(webpage),
            'timestamp': parse_iso8601(dict_get(video_player, ('dateModified', 'datePublished'))),
            'creator': strip_or_none(video_player.get('teacherName')) or clean_html(get_element_by_class('TeacherDetails-name', webpage)),
            'comment_count': int_or_none(video_player.get('commentsNumber')),
            'categories': categories(),
            'series': strip_or_none(video_player.get('courseTitle')) or None,
            'formats': formats,
        }


class PlatziCourseIE(PlatziBaseIE):
    _VALID_URL = r'''(?x)
                    https?://
                        (?:
                            (?P<clas>
                                platzi\.com/clases|           # es version
                                courses\.platzi\.com/classes  # en version
                            )|
                            platzi\.com(?:/(?P<curs>cursos))?
                        )/(?P<id>[^/?\#&]+)
                    '''
    _TESTS = [{
        'url': 'https://platzi.com/web-angular/',
        'info_dict': {
            'id': 'web-angular',
            'title': 'Frontend con Angular',
        },
        'playlist_count': 9,
    }, {
        'url': 'https://platzi.com/cursos/angular/',
        'info_dict': {
            'id': '2478',
            'title': 'Curso de Fundamentos de Angular',
        },
        'playlist_count': 21,
    }, {
        'url': 'https://platzi.com/clases/next-js/',
        'info_dict': {
            'id': '1311',
            'title': 'Curso de Next.js',
        },
        'playlist_count': 22,
        'skip': 'Oops (updating page)',
    }, {
        'url': 'https://courses.platzi.com/classes/communication-codestream/',
        'info_dict': {
            'id': '1367',
            'title': 'Codestream Course',
        },
        'playlist_count': 14,
        'skip': 'Content expired',
    }]

    @classmethod
    def _match_valid_url(cls, url):
        return re.match(cls._VALID_URL, url)

    @classmethod
    def suitable(cls, url):
        return False if PlatziIE.suitable(url) else super(PlatziCourseIE, cls).suitable(url)

    def __extract_things(self, webpage, thing_id, thing_pattern):
        return self.playlist_from_matches(
            re.finditer(thing_pattern, webpage),
            playlist_id=thing_id,
            playlist_title=self._og_search_title(webpage, default=None),
            getter=lambda m: urljoin('https://platzi.com', m.group('path')))

    def _extract_classes(self, webpage, course_id):
        display_id = course_id
        course_id = self._search_regex(
            r'''(["'])courseId\1\s*:\s*(?P<id>\d+)''',
            webpage, 'course id', group='id', fatal=False) or course_id
        return self.__extract_things(
            webpage, course_id, 
            r'''<a\b[^>]+\bhref\s*=\s*['"]?(?P<path>/clases/\d+-%s/[^/]+)'''
            % (display_id, ))

    def _extract_categories(self, webpage, cat_id):
        return self.__extract_things(
            webpage, cat_id, 
            r'''<a\b[^>]+\bhref\s*=\s*['"]?(?P<path>/cursos/[^/]+)''')

    def _real_extract(self, url):

        m = self._match_valid_url(url)
        classes, courses, this_id = m.group('clas', 'curs', 'id')

        webpage = self._download_webpage(url, this_id)

        if courses:
            return self._extract_classes(webpage, this_id)

        if not classes:
            return self._extract_categories(webpage, this_id)

        # this branch now seems always to give "Oops" pages
        course_name = this_id

        initialData = self._search_regex(
            (r'window.initialData\s*=\s*({.+?})\s*;\s*\n', r'window.initialData\s*=\s*({.+?})\s*;'),
            webpage, 'initialData')
        props = self._parse_json(initialData, course_name, default={})
        props = try_get(props, lambda x: x['initialProps'], dict) or {}
        entries = []
        for chapter_num, chapter in enumerate(props.get('concepts') or [], 1):
            if not isinstance(chapter, dict):
                continue
            materials = chapter.get('materials')
            if not materials or not isinstance(materials, list):
                continue
            chapter_title = chapter.get('title')
            chapter_id = str_or_none(chapter.get('id'))
            for material in materials:
                if not isinstance(material, dict):
                    continue
                if material.get('material_type') != 'video':
                    continue
                video_url = urljoin(url, material.get('url'))
                if not video_url:
                    continue
                entries.append({
                    '_type': 'url_transparent',
                    'url': video_url,
                    'title': str_or_none(material.get('name')),
                    'id': str_or_none(material.get('id')),
                    'ie_key': PlatziIE.ie_key(),
                    'chapter': chapter_title,
                    'chapter_number': chapter_num,
                    'chapter_id': chapter_id,
                })

        course_id = compat_str(try_get(props, lambda x: x['course']['id']))
        course_title = try_get(props, lambda x: x['course']['name'], compat_str)

        result = self.playlist_result(entries, course_id, course_title)
        desc = clean_html(get_element_by_class('RouteDescription-content', webpage))
        if desc:
            result['description'] = desc
        return result