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import re

from .common import InfoExtractor
from ..utils import (
    ExtractorError,
    clean_html,
    int_or_none,
    join_nonempty,
    parse_qs,
    smuggle_url,
    traverse_obj,
    try_call,
    unsmuggle_url,
)


def _parse_japanese_date(text):
    if not text:
        return None
    ERA_TABLE = {
        '明治': 1868,
        '大正': 1912,
        '昭和': 1926,
        '平成': 1989,
        '令和': 2019,
    }
    ERA_RE = '|'.join(map(re.escape, ERA_TABLE.keys()))
    mobj = re.search(rf'({ERA_RE})?(\d+)年(\d+)月(\d+)日', re.sub(r'[\s\u3000]+', '', text))
    if not mobj:
        return None
    era, year, month, day = mobj.groups()
    year, month, day = map(int, (year, month, day))
    if era:
        # example input: 令和5年3月34日
        # even though each era have their end, don't check here
        year += ERA_TABLE[era]
    return '%04d%02d%02d' % (year, month, day)


def _parse_japanese_duration(text):
    mobj = re.search(r'(?:(\d+)日間?)?(?:(\d+)時間?)?(?:(\d+)分)?(?:(\d+)秒)?', re.sub(r'[\s\u3000]+', '', text or ''))
    if not mobj:
        return
    days, hours, mins, secs = [int_or_none(x, default=0) for x in mobj.groups()]
    return secs + mins * 60 + hours * 60 * 60 + days * 24 * 60 * 60


class ShugiinItvBaseIE(InfoExtractor):
    _INDEX_ROOMS = None

    @classmethod
    def _find_rooms(cls, webpage):
        return [{
            '_type': 'url',
            'id': x.group(1),
            'title': clean_html(x.group(2)).strip(),
            'url': smuggle_url(f'https://www.shugiintv.go.jp/jp/index.php?room_id={x.group(1)}', {'g': x.groups()}),
            'ie_key': ShugiinItvLiveIE.ie_key(),
        } for x in re.finditer(r'(?s)<a\s+href="[^"]+\?room_id=(room\d+)"\s*class="play_live".+?class="s12_14">(.+?)</td>', webpage)]

    def _fetch_rooms(self):
        if not self._INDEX_ROOMS:
            webpage = self._download_webpage(
                'https://www.shugiintv.go.jp/jp/index.php', None,
                encoding='euc-jp', note='Downloading proceedings info')
            ShugiinItvBaseIE._INDEX_ROOMS = self._find_rooms(webpage)
        return self._INDEX_ROOMS


class ShugiinItvLiveIE(ShugiinItvBaseIE):
    _VALID_URL = r'https?://(?:www\.)?shugiintv\.go\.jp/(?:jp|en)(?:/index\.php)?$'
    IE_DESC = '衆議院インターネット審議中継'

    _TESTS = [{
        'url': 'https://www.shugiintv.go.jp/jp/index.php',
        'info_dict': {
            '_type': 'playlist',
            'title': 'All proceedings for today',
        },
        # expect at least one proceedings is running
        'playlist_mincount': 1,
    }]

    @classmethod
    def suitable(cls, url):
        return super().suitable(url) and not any(x.suitable(url) for x in (ShugiinItvLiveRoomIE, ShugiinItvVodIE))

    def _real_extract(self, url):
        self.to_screen(
            'Downloading all running proceedings. To specify one proceeding, use direct link from the website')
        return self.playlist_result(self._fetch_rooms(), playlist_title='All proceedings for today')


class ShugiinItvLiveRoomIE(ShugiinItvBaseIE):
    _VALID_URL = r'https?://(?:www\.)?shugiintv\.go\.jp/(?:jp|en)/index\.php\?room_id=(?P<id>room\d+)'
    IE_DESC = '衆議院インターネット審議中継 (中継)'

    _TESTS = [{
        'url': 'https://www.shugiintv.go.jp/jp/index.php?room_id=room01',
        'info_dict': {
            'id': 'room01',
            'title': '内閣委員会',
        },
        'skip': 'this runs for a time and not every day',
    }, {
        'url': 'https://www.shugiintv.go.jp/jp/index.php?room_id=room11',
        'info_dict': {
            'id': 'room11',
            'title': '外務委員会',
        },
        'skip': 'this runs for a time and not every day',
    }]

    def _real_extract(self, url):
        url, smug = unsmuggle_url(url, default={})
        if smug.get('g'):
            room_id, title = smug['g']
        else:
            room_id = self._match_id(url)
            title = traverse_obj(self._fetch_rooms(), (lambda k, v: v['id'] == room_id, 'title'), get_all=False)

        formats, subtitles = self._extract_m3u8_formats_and_subtitles(
            f'https://hlslive.shugiintv.go.jp/{room_id}/amlst:{room_id}/playlist.m3u8',
            room_id, ext='mp4')

        return {
            'id': room_id,
            'title': title,
            'formats': formats,
            'subtitles': subtitles,
            'is_live': True,
        }


class ShugiinItvVodIE(ShugiinItvBaseIE):
    _VALID_URL = r'https?://(?:www\.)?shugiintv\.go\.jp/(?:jp|en)/index\.php\?ex=VL(?:\&[^=]+=[^&]*)*\&deli_id=(?P<id>\d+)'
    IE_DESC = '衆議院インターネット審議中継 (ビデオライブラリ)'
    _TESTS = [{
        'url': 'https://www.shugiintv.go.jp/jp/index.php?ex=VL&media_type=&deli_id=53846',
        'info_dict': {
            'id': '53846',
            'title': 'ウクライナ大統領国会演説(オンライン)',
            'release_date': '20220323',
            'chapters': 'count:4',
        }
    }, {
        'url': 'https://www.shugiintv.go.jp/en/index.php?ex=VL&media_type=&deli_id=53846',
        'only_matching': True
    }]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(
            f'https://www.shugiintv.go.jp/jp/index.php?ex=VL&media_type=&deli_id={video_id}', video_id,
            encoding='euc-jp')

        m3u8_url = self._search_regex(
            r'id="vtag_src_base_vod"\s*value="(http.+?\.m3u8)"', webpage, 'm3u8 url')
        m3u8_url = re.sub(r'^http://', 'https://', m3u8_url)
        formats, subtitles = self._extract_m3u8_formats_and_subtitles(
            m3u8_url, video_id, ext='mp4')

        title = self._html_search_regex(
            (r'<td\s+align="left">(.+)\s*\(\d+分\)',
             r'<TD.+?<IMG\s*src=".+?/spacer\.gif".+?height="15">(.+?)<IMG'), webpage, 'title', fatal=False)

        release_date = _parse_japanese_date(self._html_search_regex(
            r'開会日</td>\s*<td.+?/td>\s*<TD>(.+?)</TD>',
            webpage, 'title', fatal=False))

        chapters = []
        for chp in re.finditer(r'(?i)<A\s+HREF="([^"]+?)"\s*class="play_vod">(?!<img)(.+)</[Aa]>', webpage):
            chapters.append({
                'title': clean_html(chp.group(2)).strip(),
                'start_time': try_call(lambda: float(parse_qs(chp.group(1))['time'][0].strip())),
            })
        # NOTE: there are blanks at the first and the end of the videos,
        # so getting/providing the video duration is not possible
        # also, the exact end_time for the last chapter is unknown (we can get at most minutes of granularity)
        last_tr = re.findall(r'(?s)<TR\s*class="s14_24">(.+?)</TR>', webpage)[-1]
        if last_tr and chapters:
            last_td = re.findall(r'<TD.+?</TD>', last_tr)[-1]
            if last_td:
                chapters[-1]['end_time'] = chapters[-1]['start_time'] + _parse_japanese_duration(clean_html(last_td))

        return {
            'id': video_id,
            'title': title,
            'release_date': release_date,
            'chapters': chapters,
            'formats': formats,
            'subtitles': subtitles,
        }


class SangiinInstructionIE(InfoExtractor):
    _VALID_URL = r'^https?://www\.webtv\.sangiin\.go\.jp/webtv/index\.php'
    IE_DESC = False  # this shouldn't be listed as a supported site

    def _real_extract(self, url):
        raise ExtractorError('Copy the link from the botton below the video description or player, and use the link to download. If there are no button in the frame, get the URL of the frame showing the video.', expected=True)


class SangiinIE(InfoExtractor):
    _VALID_URL = r'https?://www\.webtv\.sangiin\.go\.jp/webtv/detail\.php\?sid=(?P<id>\d+)'
    IE_DESC = '参議院インターネット審議中継 (archive)'

    _TESTS = [{
        'url': 'https://www.webtv.sangiin.go.jp/webtv/detail.php?sid=7052',
        'info_dict': {
            'id': '7052',
            'title': '2022年10月7日 本会議',
            'description': 'md5:0a5fed523f95c88105a0b0bf1dd71489',
            'upload_date': '20221007',
            'ext': 'mp4',
        },
    }, {
        'url': 'https://www.webtv.sangiin.go.jp/webtv/detail.php?sid=7037',
        'info_dict': {
            'id': '7037',
            'title': '2022年10月3日 開会式',
            'upload_date': '20221003',
            'ext': 'mp4',
        },
    }, {
        'url': 'https://www.webtv.sangiin.go.jp/webtv/detail.php?sid=7076',
        'info_dict': {
            'id': '7076',
            'title': '2022年10月27日 法務委員会',
            'upload_date': '20221027',
            'ext': 'mp4',
            'is_live': True,
        },
        'skip': 'this live is turned into archive after it ends',
    }, ]

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

        date = self._html_search_regex(
            r'<dt[^>]*>\s*開会日\s*</dt>\s*<dd[^>]*>\s*(.+?)\s*</dd>', webpage,
            'date', fatal=False)
        upload_date = _parse_japanese_date(date)

        title = self._html_search_regex(
            r'<dt[^>]*>\s*会議名\s*</dt>\s*<dd[^>]*>\s*(.+?)\s*</dd>', webpage,
            'date', fatal=False)

        # some videos don't have the elements, so assume it's missing
        description = self._html_search_regex(
            r'会議の経過\s*</h3>\s*<span[^>]*>(.+?)</span>', webpage,
            'description', default=None)

        # this row appears only when it's livestream
        is_live = bool(self._html_search_regex(
            r'<dt[^>]*>\s*公報掲載時刻\s*</dt>\s*<dd[^>]*>\s*(.+?)\s*</dd>', webpage,
            'is_live', default=None))

        m3u8_url = self._search_regex(
            r'var\s+videopath\s*=\s*(["\'])([^"\']+)\1', webpage,
            'm3u8 url', group=2)

        formats, subs = self._extract_m3u8_formats_and_subtitles(m3u8_url, video_id, 'mp4')

        return {
            'id': video_id,
            'title': join_nonempty(date, title, delim=' '),
            'description': description,
            'upload_date': upload_date,
            'formats': formats,
            'subtitles': subs,
            'is_live': is_live,
        }