import base64
import binascii
import functools
import hashlib
import hmac
import io
import json
import re
import time
import urllib.parse
import uuid

from .common import InfoExtractor
from ..aes import aes_ecb_decrypt
from ..networking import RequestHandler, Response
from ..networking.exceptions import TransportError
from ..utils import (
    ExtractorError,
    OnDemandPagedList,
    decode_base_n,
    int_or_none,
    time_seconds,
    traverse_obj,
    update_url_query,
)


class AbemaLicenseRH(RequestHandler):
    _SUPPORTED_URL_SCHEMES = ('abematv-license',)
    _SUPPORTED_PROXY_SCHEMES = None
    _SUPPORTED_FEATURES = None
    RH_NAME = 'abematv_license'

    _STRTABLE = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
    _HKEY = b'3AF0298C219469522A313570E8583005A642E73EDD58E3EA2FB7339D3DF1597E'

    def __init__(self, *, ie: 'AbemaTVIE', **kwargs):
        super().__init__(**kwargs)
        self.ie = ie

    def _send(self, request):
        url = request.url
        ticket = urllib.parse.urlparse(url).netloc

        try:
            response_data = self._get_videokey_from_ticket(ticket)
        except ExtractorError as e:
            raise TransportError(cause=e.cause) from e
        except (IndexError, KeyError, TypeError) as e:
            raise TransportError(cause=repr(e)) from e

        return Response(
            io.BytesIO(response_data), url,
            headers={'Content-Length': str(len(response_data))})

    def _get_videokey_from_ticket(self, ticket):
        to_show = self.ie.get_param('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(),
            headers={
                'Content-Type': 'application/json',
            })

        res = decode_base_n(license_response['k'], table=self._STRTABLE)
        encvideokey = list(res.to_bytes(16, 'big'))

        h = hmac.new(
            binascii.unhexlify(self._HKEY),
            (license_response['cid'] + self.ie._DEVICE_ID).encode(),
            digestmod=hashlib.sha256)
        enckey = list(h.digest())

        return bytes(aes_ecb_decrypt(encvideokey, enckey))


class AbemaTVBaseIE(InfoExtractor):
    _NETRC_MACHINE = 'abematv'

    _USERTOKEN = None
    _DEVICE_ID = None
    _MEDIATOKEN = None

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

    @classmethod
    def _generate_aks(cls, deviceid):
        deviceid = deviceid.encode()
        # add 1 hour and then drop minute and secs
        ts_1hour = int((time_seconds() // 3600 + 1) * 3600)
        time_struct = time.gmtime(ts_1hour)
        ts_1hour_str = str(ts_1hour).encode()

        tmp = None

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

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

        def mix_twist(nonce):
            nonlocal tmp
            mix_once(base64.urlsafe_b64encode(tmp).rstrip(b'=') + nonce)

        mix_once(cls._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 base64.urlsafe_b64encode(tmp).rstrip(b'=').decode('utf-8')

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

        self._downloader._request_director.add_handler(AbemaLicenseRH(ie=self, logger=None))

        username, _ = self._get_login_info()
        auth_cache = username and self.cache.load(self._NETRC_MACHINE, username, min_ver='2024.01.19')
        AbemaTVBaseIE._USERTOKEN = auth_cache and auth_cache.get('usertoken')
        if AbemaTVBaseIE._USERTOKEN:
            # try authentication with locally stored token
            try:
                AbemaTVBaseIE._DEVICE_ID = auth_cache.get('device_id')
                self._get_media_token(True)
                return
            except ExtractorError as e:
                self.report_warning(f'Failed to login with cached user token; obtaining a fresh one ({e})')

        AbemaTVBaseIE._DEVICE_ID = str(uuid.uuid4())
        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(),
            headers={
                'Content-Type': 'application/json',
            })
        AbemaTVBaseIE._USERTOKEN = user_data['token']

        return self._USERTOKEN

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

        AbemaTVBaseIE._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': f'bearer {self._get_device_token()}',
            })['token']

        return self._MEDIATOKEN

    def _perform_login(self, username, password):
        self._get_device_token()
        if self.cache.load(self._NETRC_MACHINE, username, min_ver='2024.01.19') and self._get_media_token():
            self.write_debug('Skipping logging in')
            return

        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(), headers={
                'Authorization': f'bearer {self._get_device_token()}',
                'Origin': 'https://abema.tv',
                'Referer': 'https://abema.tv/',
                'Content-Type': 'application/json',
            })

        AbemaTVBaseIE._USERTOKEN = login_response['token']
        self._get_media_token(True)
        auth_cache = {
            'device_id': AbemaTVBaseIE._DEVICE_ID,
            'usertoken': AbemaTVBaseIE._USERTOKEN,
        }
        self.cache.store(self._NETRC_MACHINE, username, auth_cache)

    def _call_api(self, endpoint, video_id, query=None, note='Downloading JSON metadata'):
        return self._download_json(
            f'https://api.abema.io/{endpoint}', video_id, query=query or {},
            note=note,
            headers={
                'Authorization': f'bearer {self._get_device_token()}',
            })

    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 traverse_obj(jsonld, '@type') != 'BreadcrumbList':
                continue
            items = traverse_obj(jsonld, ('itemListElement', ..., 'name'))
            if items:
                return items
        return []


class AbemaTVIE(AbemaTVBaseIE):
    _VALID_URL = r'https?://abema\.tv/(?P<type>now-on-air|video/episode|channels/.+?/slots)/(?P<id>[^?/]+)'
    _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',
            'season': 'シーズン2',
            'season_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】',
            'season_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',
    }]
    _TIMETABLE = None

    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 specifying 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: (e.g. 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 season 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['season_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
        availability = 'public'
        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)
            if not traverse_obj(api_response, ('label', 'free', {bool})):
                # cannot acquire decryption key for these streams
                self.report_warning('This is a premium-only stream')
                availability = 'premium_only'
            info.update(traverse_obj(api_response, {
                'series': ('series', 'title'),
                'season': ('season', 'name'),
                'season_number': ('season', 'sequence'),
                'episode_number': ('episode', 'number'),
            }))
            if not title:
                title = traverse_obj(api_response, ('episode', 'title'))
            if not description:
                description = traverse_obj(api_response, ('episode', 'content'))

            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')
                availability = 'premium_only'

            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,
            'availability': availability,
        })
        return info


class AbemaTVTitleIE(AbemaTVBaseIE):
    _VALID_URL = r'https?://abema\.tv/video/title/(?P<id>[^?/]+)'
    _PAGE_SIZE = 25

    _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,
    }, {
        'url': 'https://abema.tv/video/title/25-102',
        'info_dict': {
            'id': '25-102',
            'title': 'ソードアート・オンライン アリシゼーション',
        },
        'playlist_mincount': 24,
    }]

    def _fetch_page(self, playlist_id, series_version, page):
        programs = self._call_api(
            f'v1/video/series/{playlist_id}/programs', playlist_id,
            note=f'Downloading page {page + 1}',
            query={
                'seriesVersion': series_version,
                'offset': str(page * self._PAGE_SIZE),
                'order': 'seq',
                'limit': str(self._PAGE_SIZE),
            })
        yield from (
            self.url_result(f'https://abema.tv/video/episode/{x}')
            for x in traverse_obj(programs, ('programs', ..., 'id')))

    def _entries(self, playlist_id, series_version):
        return OnDemandPagedList(
            functools.partial(self._fetch_page, playlist_id, series_version),
            self._PAGE_SIZE)

    def _real_extract(self, url):
        playlist_id = self._match_id(url)
        series_info = self._call_api(f'v1/video/series/{playlist_id}', playlist_id)

        return self.playlist_result(
            self._entries(playlist_id, series_info['version']), playlist_id=playlist_id,
            playlist_title=series_info.get('title'),
            playlist_description=series_info.get('content'))
