import io
import json
import time
import hashlib
import hmac
import re
import struct
from base64 import urlsafe_b64encode
from binascii import unhexlify

from .common import InfoExtractor
from ..aes import aes_ecb_decrypt
from ..compat import (
    compat_urllib_response,
    compat_urllib_parse_urlparse,
    compat_urllib_request,
)
from ..utils import (
    ExtractorError,
    decode_base,
    int_or_none,
    random_uuidv4,
    request_to_url,
    time_seconds,
    update_url_query,
    traverse_obj,
    intlist_to_bytes,
    bytes_to_intlist,
    urljoin,
)


# NOTE: network handler related code is temporary thing until network stack overhaul PRs are merged (#2861/#2862)

def add_opener(ydl, handler):
    ''' Add a handler for opening URLs, like _download_webpage '''
    # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L426
    # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L605
    assert isinstance(ydl._opener, compat_urllib_request.OpenerDirector)
    ydl._opener.add_handler(handler)


def remove_opener(ydl, handler):
    '''
    Remove handler(s) for opening URLs
    @param handler Either handler object itself or handler type.
    Specifying handler type will remove all handler which isinstance returns True.
    '''
    # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L426
    # https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L605
    opener = ydl._opener
    assert isinstance(ydl._opener, compat_urllib_request.OpenerDirector)
    if isinstance(handler, (type, tuple)):
        find_cp = lambda x: isinstance(x, handler)
    else:
        find_cp = lambda x: x is handler

    removed = []
    for meth in dir(handler):
        if meth in ["redirect_request", "do_open", "proxy_open"]:
            # oops, coincidental match
            continue

        i = meth.find("_")
        protocol = meth[:i]
        condition = meth[i + 1:]

        if condition.startswith("error"):
            j = condition.find("_") + i + 1
            kind = meth[j + 1:]
            try:
                kind = int(kind)
            except ValueError:
                pass
            lookup = opener.handle_error.get(protocol, {})
            opener.handle_error[protocol] = lookup
        elif condition == "open":
            kind = protocol
            lookup = opener.handle_open
        elif condition == "response":
            kind = protocol
            lookup = opener.process_response
        elif condition == "request":
            kind = protocol
            lookup = opener.process_request
        else:
            continue

        handlers = lookup.setdefault(kind, [])
        if handlers:
            handlers[:] = [x for x in handlers if not find_cp(x)]

        removed.append(x for x in handlers if find_cp(x))

    if removed:
        for x in opener.handlers:
            if find_cp(x):
                x.add_parent(None)
        opener.handlers[:] = [x for x in opener.handlers if not find_cp(x)]


class AbemaLicenseHandler(compat_urllib_request.BaseHandler):
    handler_order = 499
    STRTABLE = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
    HKEY = b'3AF0298C219469522A313570E8583005A642E73EDD58E3EA2FB7339D3DF1597E'

    def __init__(self, ie: 'AbemaTVIE'):
        # the protcol that this should really handle is 'abematv-license://'
        # abematv_license_open is just a placeholder for development purposes
        # ref. https://github.com/python/cpython/blob/f4c03484da59049eb62a9bf7777b963e2267d187/Lib/urllib/request.py#L510
        setattr(self, 'abematv-license_open', getattr(self, 'abematv_license_open'))
        self.ie = ie

    def _get_videokey_from_ticket(self, ticket):
        to_show = self.ie._downloader.params.get('verbose', False)
        media_token = self.ie._get_media_token(to_show=to_show)

        license_response = self.ie._download_json(
            'https://license.abema.io/abematv-hls', None, note='Requesting playback license' if to_show else False,
            query={'t': media_token},
            data=json.dumps({
                'kv': 'a',
                'lt': ticket
            }).encode('utf-8'),
            headers={
                'Content-Type': 'application/json',
            })

        res = decode_base(license_response['k'], self.STRTABLE)
        encvideokey = bytes_to_intlist(struct.pack('>QQ', res >> 64, res & 0xffffffffffffffff))

        h = hmac.new(
            unhexlify(self.HKEY),
            (license_response['cid'] + self.ie._DEVICE_ID).encode('utf-8'),
            digestmod=hashlib.sha256)
        enckey = bytes_to_intlist(h.digest())

        return intlist_to_bytes(aes_ecb_decrypt(encvideokey, enckey))

    def abematv_license_open(self, url):
        url = request_to_url(url)
        ticket = compat_urllib_parse_urlparse(url).netloc
        response_data = self._get_videokey_from_ticket(ticket)
        return compat_urllib_response.addinfourl(io.BytesIO(response_data), headers={
            'Content-Length': len(response_data),
        }, url=url, code=200)


class AbemaTVBaseIE(InfoExtractor):
    def _extract_breadcrumb_list(self, webpage, video_id):
        for jld in re.finditer(
                r'(?is)</span></li></ul><script[^>]+type=(["\']?)application/ld\+json\1[^>]*>(?P<json_ld>.+?)</script>',
                webpage):
            jsonld = self._parse_json(jld.group('json_ld'), video_id, fatal=False)
            if jsonld:
                if jsonld.get('@type') != 'BreadcrumbList':
                    continue
                trav = traverse_obj(jsonld, ('itemListElement', ..., 'name'))
                if trav:
                    return trav
        return []


class AbemaTVIE(AbemaTVBaseIE):
    _VALID_URL = r'https?://abema\.tv/(?P<type>now-on-air|video/episode|channels/.+?/slots)/(?P<id>[^?/]+)'
    _NETRC_MACHINE = 'abematv'
    _TESTS = [{
        'url': 'https://abema.tv/video/episode/194-25_s2_p1',
        'info_dict': {
            'id': '194-25_s2_p1',
            'title': '第1話 「チーズケーキ」　「モーニング再び」',
            'series': '異世界食堂２',
            'series_number': 2,
            'episode': '第1話 「チーズケーキ」　「モーニング再び」',
            'episode_number': 1,
        },
        'skip': 'expired',
    }, {
        'url': 'https://abema.tv/channels/anime-live2/slots/E8tvAnMJ7a9a5d',
        'info_dict': {
            'id': 'E8tvAnMJ7a9a5d',
            'title': 'ゆるキャン△ SEASON２ 全話一挙【無料ビデオ72時間】',
            'series': 'ゆるキャン△ SEASON２',
            'episode': 'ゆるキャン△ SEASON２ 全話一挙【無料ビデオ72時間】',
            'series_number': 2,
            'episode_number': 1,
            'description': 'md5:9c5a3172ae763278f9303922f0ea5b17',
        },
        'skip': 'expired',
    }, {
        'url': 'https://abema.tv/video/episode/87-877_s1282_p31047',
        'info_dict': {
            'id': 'E8tvAnMJ7a9a5d',
            'title': '第5話『光射す』',
            'description': 'md5:56d4fc1b4f7769ded5f923c55bb4695d',
            'thumbnail': r're:https://hayabusa\.io/.+',
            'series': '相棒',
            'episode': '第5話『光射す』',
        },
        'skip': 'expired',
    }, {
        'url': 'https://abema.tv/now-on-air/abema-anime',
        'info_dict': {
            'id': 'abema-anime',
            # this varies
            # 'title': '女子高生の無駄づかい 全話一挙【無料ビデオ72時間】',
            'description': 'md5:55f2e61f46a17e9230802d7bcc913d5f',
            'is_live': True,
        },
        'skip': 'Not supported until yt-dlp implements native live downloader OR AbemaTV can start a local HTTP server',
    }]
    _USERTOKEN = None
    _DEVICE_ID = None
    _TIMETABLE = None
    _MEDIATOKEN = None

    _SECRETKEY = b'v+Gjs=25Aw5erR!J8ZuvRrCx*rGswhB&qdHd_SYerEWdU&a?3DzN9BRbp5KwY4hEmcj5#fykMjJ=AuWz5GSMY-d@H7DMEh3M@9n2G552Us$$k9cD=3TxwWe86!x#Zyhe'

    def _generate_aks(self, deviceid):
        deviceid = deviceid.encode('utf-8')
        # add 1 hour and then drop minute and secs
        ts_1hour = int((time_seconds(hours=9) // 3600 + 1) * 3600)
        time_struct = time.gmtime(ts_1hour)
        ts_1hour_str = str(ts_1hour).encode('utf-8')

        tmp = None

        def mix_once(nonce):
            nonlocal tmp
            h = hmac.new(self._SECRETKEY, digestmod=hashlib.sha256)
            h.update(nonce)
            tmp = h.digest()

        def mix_tmp(count):
            nonlocal tmp
            for i in range(count):
                mix_once(tmp)

        def mix_twist(nonce):
            nonlocal tmp
            mix_once(urlsafe_b64encode(tmp).rstrip(b'=') + nonce)

        mix_once(self._SECRETKEY)
        mix_tmp(time_struct.tm_mon)
        mix_twist(deviceid)
        mix_tmp(time_struct.tm_mday % 5)
        mix_twist(ts_1hour_str)
        mix_tmp(time_struct.tm_hour % 5)

        return urlsafe_b64encode(tmp).rstrip(b'=').decode('utf-8')

    def _get_device_token(self):
        if self._USERTOKEN:
            return self._USERTOKEN

        self._DEVICE_ID = random_uuidv4()
        aks = self._generate_aks(self._DEVICE_ID)
        user_data = self._download_json(
            'https://api.abema.io/v1/users', None, note='Authorizing',
            data=json.dumps({
                'deviceId': self._DEVICE_ID,
                'applicationKeySecret': aks,
            }).encode('utf-8'),
            headers={
                'Content-Type': 'application/json',
            })
        self._USERTOKEN = user_data['token']

        # don't allow adding it 2 times or more, though it's guarded
        remove_opener(self._downloader, AbemaLicenseHandler)
        add_opener(self._downloader, AbemaLicenseHandler(self))

        return self._USERTOKEN

    def _get_media_token(self, invalidate=False, to_show=True):
        if not invalidate and self._MEDIATOKEN:
            return self._MEDIATOKEN

        self._MEDIATOKEN = self._download_json(
            'https://api.abema.io/v1/media/token', None, note='Fetching media token' if to_show else False,
            query={
                'osName': 'android',
                'osVersion': '6.0.1',
                'osLang': 'ja_JP',
                'osTimezone': 'Asia/Tokyo',
                'appId': 'tv.abema',
                'appVersion': '3.27.1'
            }, headers={
                'Authorization': 'bearer ' + self._get_device_token()
            })['token']

        return self._MEDIATOKEN

    def _real_initialize(self):
        self._login()

    def _login(self):
        username, password = self._get_login_info()
        # No authentication to be performed
        if not username:
            return True

        if '@' in username:  # don't strictly check if it's email address or not
            ep, method = 'user/email', 'email'
        else:
            ep, method = 'oneTimePassword', 'userId'

        login_response = self._download_json(
            f'https://api.abema.io/v1/auth/{ep}', None, note='Logging in',
            data=json.dumps({
                method: username,
                'password': password
            }).encode('utf-8'), headers={
                'Authorization': 'bearer ' + self._get_device_token(),
                'Origin': 'https://abema.tv',
                'Referer': 'https://abema.tv/',
                'Content-Type': 'application/json',
            })

        self._USERTOKEN = login_response['token']
        self._get_media_token(True)

    def _real_extract(self, url):
        # starting download using infojson from this extractor is undefined behavior,
        # and never be fixed in the future; you must trigger downloads by directly specifing URL.
        # (unless there's a way to hook before downloading by extractor)
        video_id, video_type = self._match_valid_url(url).group('id', 'type')
        headers = {
            'Authorization': 'Bearer ' + self._get_device_token(),
        }
        video_type = video_type.split('/')[-1]

        webpage = self._download_webpage(url, video_id)
        canonical_url = self._search_regex(
            r'<link\s+rel="canonical"\s*href="(.+?)"', webpage, 'canonical URL',
            default=url)
        info = self._search_json_ld(webpage, video_id, default={})

        title = self._search_regex(
            r'<span\s*class=".+?EpisodeTitleBlock__title">(.+?)</span>', webpage, 'title', default=None)
        if not title:
            jsonld = None
            for jld in re.finditer(
                    r'(?is)<span\s*class="com-m-Thumbnail__image">(?:</span>)?<script[^>]+type=(["\']?)application/ld\+json\1[^>]*>(?P<json_ld>.+?)</script>',
                    webpage):
                jsonld = self._parse_json(jld.group('json_ld'), video_id, fatal=False)
                if jsonld:
                    break
            if jsonld:
                title = jsonld.get('caption')
        if not title and video_type == 'now-on-air':
            if not self._TIMETABLE:
                # cache the timetable because it goes to 5MiB in size (!!)
                self._TIMETABLE = self._download_json(
                    'https://api.abema.io/v1/timetable/dataSet?debug=false', video_id,
                    headers=headers)
            now = time_seconds(hours=9)
            for slot in self._TIMETABLE.get('slots', []):
                if slot.get('channelId') != video_id:
                    continue
                if slot['startAt'] <= now and now < slot['endAt']:
                    title = slot['title']
                    break

        # read breadcrumb on top of page
        breadcrumb = self._extract_breadcrumb_list(webpage, video_id)
        if breadcrumb:
            # breadcrumb list translates to: (example is 1st test for this IE)
            # Home > Anime (genre) > Isekai Shokudo 2 (series name) > Episode 1 "Cheese cakes" "Morning again" (episode title)
            # hence this works
            info['series'] = breadcrumb[-2]
            info['episode'] = breadcrumb[-1]
            if not title:
                title = info['episode']

        description = self._html_search_regex(
            (r'<p\s+class="com-video-EpisodeDetailsBlock__content"><span\s+class=".+?">(.+?)</span></p><div',
             r'<span\s+class=".+?SlotSummary.+?">(.+?)</span></div><div',),
            webpage, 'description', default=None, group=1)
        if not description:
            og_desc = self._html_search_meta(
                ('description', 'og:description', 'twitter:description'), webpage)
            if og_desc:
                description = re.sub(r'''(?sx)
                    ^(.+?)(?:
                        アニメの動画を無料で見るならABEMA！| # anime
                        等、.+ # applies for most of categories
                    )?
                ''', r'\1', og_desc)

        # canonical URL may contain series and episode number
        mobj = re.search(r's(\d+)_p(\d+)$', canonical_url)
        if mobj:
            seri = int_or_none(mobj.group(1), default=float('inf'))
            epis = int_or_none(mobj.group(2), default=float('inf'))
            info['series_number'] = seri if seri < 100 else None
            # some anime like Detective Conan (though not available in AbemaTV)
            # has more than 1000 episodes (1026 as of 2021/11/15)
            info['episode_number'] = epis if epis < 2000 else None

        is_live, m3u8_url = False, None
        if video_type == 'now-on-air':
            is_live = True
            channel_url = 'https://api.abema.io/v1/channels'
            if video_id == 'news-global':
                channel_url = update_url_query(channel_url, {'division': '1'})
            onair_channels = self._download_json(channel_url, video_id)
            for ch in onair_channels['channels']:
                if video_id == ch['id']:
                    m3u8_url = ch['playback']['hls']
                    break
            else:
                raise ExtractorError(f'Cannot find on-air {video_id} channel.', expected=True)
        elif video_type == 'episode':
            api_response = self._download_json(
                f'https://api.abema.io/v1/video/programs/{video_id}', video_id,
                note='Checking playability',
                headers=headers)
            ondemand_types = traverse_obj(api_response, ('terms', ..., 'onDemandType'), default=[])
            if 3 not in ondemand_types:
                # cannot acquire decryption key for these streams
                self.report_warning('This is a premium-only stream')

            m3u8_url = f'https://vod-abematv.akamaized.net/program/{video_id}/playlist.m3u8'
        elif video_type == 'slots':
            api_response = self._download_json(
                f'https://api.abema.io/v1/media/slots/{video_id}', video_id,
                note='Checking playability',
                headers=headers)
            if not traverse_obj(api_response, ('slot', 'flags', 'timeshiftFree'), default=False):
                self.report_warning('This is a premium-only stream')

            m3u8_url = f'https://vod-abematv.akamaized.net/slot/{video_id}/playlist.m3u8'
        else:
            raise ExtractorError('Unreachable')

        if is_live:
            self.report_warning("This is a livestream; yt-dlp doesn't support downloading natively, but FFmpeg cannot handle m3u8 manifests from AbemaTV")
            self.report_warning('Please consider using Streamlink to download these streams (https://github.com/streamlink/streamlink)')
        formats = self._extract_m3u8_formats(
            m3u8_url, video_id, ext='mp4', live=is_live)

        info.update({
            'id': video_id,
            'title': title,
            'description': description,
            'formats': formats,
            'is_live': is_live,
        })
        return info


class AbemaTVTitleIE(AbemaTVBaseIE):
    _VALID_URL = r'https?://abema\.tv/video/title/(?P<id>[^?/]+)'

    _TESTS = [{
        'url': 'https://abema.tv/video/title/90-1597',
        'info_dict': {
            'id': '90-1597',
            'title': 'シャッフルアイランド',
        },
        'playlist_mincount': 2,
    }, {
        'url': 'https://abema.tv/video/title/193-132',
        'info_dict': {
            'id': '193-132',
            'title': '真心が届く~僕とスターのオフィス・ラブ!?~',
        },
        'playlist_mincount': 16,
    }]

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

        playlist_title, breadcrumb = None, self._extract_breadcrumb_list(webpage, video_id)
        if breadcrumb:
            playlist_title = breadcrumb[-1]

        playlist = [
            self.url_result(urljoin('https://abema.tv/', mobj.group(1)))
            for mobj in re.finditer(r'<li\s*class=".+?EpisodeList.+?"><a\s*href="(/[^"]+?)"', webpage)]

        return self.playlist_result(playlist, playlist_title=playlist_title, playlist_id=video_id)