"""
$description Japanese live TV streaming website with multiple channels including news, sports, entertainment and anime.
$url abema.tv
$type live, vod
$region Japan
"""

import hashlib
import hmac
import logging
import re
import struct
import time
import uuid
from base64 import urlsafe_b64encode
from binascii import unhexlify

from requests import Response
from requests.adapters import BaseAdapter

from streamlink.exceptions import NoStreamsError
from streamlink.plugin import Plugin, pluginmatcher
from streamlink.plugin.api import useragents, validate
from streamlink.stream.hls import HLSStream, HLSStreamReader, HLSStreamWriter
from streamlink.utils.crypto import AES
from streamlink.utils.url import update_qsd


log = logging.getLogger(__name__)


class AbemaTVHLSStreamWriter(HLSStreamWriter):
    def should_filter_segment(self, segment):
        return "/tsad/" in segment.uri or super().should_filter_segment(segment)


class AbemaTVHLSStreamReader(HLSStreamReader):
    __writer__ = AbemaTVHLSStreamWriter


class AbemaTVHLSStream(HLSStream):
    __reader__ = AbemaTVHLSStreamReader


class AbemaTVLicenseAdapter(BaseAdapter):
    """
    Handling abematv-license:// protocol to get real video key_data.
    """

    STRTABLE = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"

    HKEY = b"3AF0298C219469522A313570E8583005A642E73EDD58E3EA2FB7339D3DF1597E"

    _MEDIATOKEN_API = "https://api.abema.io/v1/media/token"

    _LICENSE_API = "https://license.abema.io/abematv-hls"

    _MEDIATOKEN_SCHEMA = validate.Schema({"token": str})

    _LICENSE_SCHEMA = validate.Schema({"k": str, "cid": str})

    def __init__(self, session, deviceid, usertoken):
        self._session = session
        self.deviceid = deviceid
        self.usertoken = usertoken
        super().__init__()

    def _get_videokey_from_ticket(self, ticket):
        params = {
            "osName": "android",
            "osVersion": "6.0.1",
            "osLang": "ja_JP",
            "osTimezone": "Asia/Tokyo",
            "appId": "tv.abema",
            "appVersion": "3.27.1",
        }
        auth_header = {"Authorization": f"Bearer {self.usertoken}"}
        res = self._session.http.get(self._MEDIATOKEN_API, params=params,
                                     headers=auth_header)
        jsonres = self._session.http.json(res,
                                          schema=self._MEDIATOKEN_SCHEMA)
        mediatoken = jsonres["token"]

        res = self._session.http.post(self._LICENSE_API,
                                      params={"t": mediatoken},
                                      json={"kv": "a", "lt": ticket})
        jsonres = self._session.http.json(res,
                                          schema=self._LICENSE_SCHEMA)
        cid = jsonres["cid"]
        k = jsonres["k"]

        res = sum(self.STRTABLE.find(k[i]) * (58 ** (len(k) - 1 - i)) for i in range(len(k)))

        encvideokey = struct.pack(">QQ", res >> 64, res & 0xffffffffffffffff)

        # HKEY:
        # RC4KEY = unhexlify('DB98A8E7CECA3424D975280F90BD03EE')
        # RC4DATA = unhexlify(b'D4B718BBBA9CFB7D0192A58F9E2D146A'
        #                     b'FC5DB29E4352DE05FC4CF2C1005804BB')
        # rc4 = ARC4.new(RC4KEY)
        # HKEY = rc4.decrypt(RC4DATA)
        h = hmac.new(unhexlify(self.HKEY),
                     (cid + self.deviceid).encode("utf-8"),
                     digestmod=hashlib.sha256)
        enckey = h.digest()

        aes = AES.new(enckey, AES.MODE_ECB)
        return aes.decrypt(encvideokey)

    def send(self, request, stream=False, timeout=None, verify=True, cert=None,
             proxies=None):
        resp = Response()
        resp.status_code = 200
        ticket = re.findall(r"abematv-license://(.*)", request.url)[0]
        resp._content = self._get_videokey_from_ticket(ticket)
        return resp

    def close(self):
        return


@pluginmatcher(re.compile(r"""
    https?://abema\.tv/(
        now-on-air/(?P<onair>[^?]+)
        |
        video/episode/(?P<episode>[^?]+)
        |
        channels/.+?/slots/(?P<slots>[^?]+)
    )
""", re.VERBOSE))
class AbemaTV(Plugin):
    _CHANNEL = "https://api.abema.io/v1/channels"

    _USER_API = "https://api.abema.io/v1/users"

    _PRGM_API = "https://api.abema.io/v1/video/programs/{0}"

    _SLOTS_API = "https://api.abema.io/v1/media/slots/{0}"

    _PRGM3U8 = "https://vod-abematv.akamaized.net/program/{0}/playlist.m3u8"

    _SLOTM3U8 = "https://vod-abematv.akamaized.net/slot/{0}/playlist.m3u8"

    SECRETKEY = (
          b"v+Gjs=25Aw5erR!J8ZuvRrCx*rGswhB&qdHd_SYerEWdU&a?3DzN9B"
        + b"Rbp5KwY4hEmcj5#fykMjJ=AuWz5GSMY-d@H7DMEh3M@9n2G552Us$$"
        + b"k9cD=3TxwWe86!x#Zyhe"
    )

    _USER_SCHEMA = validate.Schema({"profile": {"userId": str}, "token": str})

    _CHANNEL_SCHEMA = validate.Schema({
        "channels": [{
            "id": str,
            "name": str,
            "playback": {
                validate.optional("dash"): str,
                "hls": str,
            },
        }],
    })

    _PRGM_SCHEMA = validate.Schema({"terms": [{validate.optional("onDemandType"): int}]})

    _SLOT_SCHEMA = validate.Schema({"slot": {"flags": {validate.optional("timeshiftFree"): bool}}})

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.session.http.headers.update({"User-Agent": useragents.CHROME})

    def _generate_applicationkeysecret(self, deviceid):
        deviceid = deviceid.encode("utf-8")  # for python3
        # plus 1 hour and drop minute and secs
        # for python3 : floor division
        ts_1hour = (int(time.time()) + 60 * 60) // 3600 * 3600
        time_struct = time.gmtime(ts_1hour)
        ts_1hour_str = str(ts_1hour).encode("utf-8")

        h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
        h.update(self.SECRETKEY)
        tmp = h.digest()
        for _ in range(time_struct.tm_mon):
            h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
            h.update(tmp)
            tmp = h.digest()
        h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
        h.update(urlsafe_b64encode(tmp).rstrip(b"=") + deviceid)
        tmp = h.digest()
        for _ in range(time_struct.tm_mday % 5):
            h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
            h.update(tmp)
            tmp = h.digest()

        h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
        h.update(urlsafe_b64encode(tmp).rstrip(b"=") + ts_1hour_str)
        tmp = h.digest()

        for _ in range(time_struct.tm_hour % 5):  # utc hour
            h = hmac.new(self.SECRETKEY, digestmod=hashlib.sha256)
            h.update(tmp)
            tmp = h.digest()

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

    def _is_playable(self, vtype, vid):
        auth_header = {"Authorization": f"Bearer {self.usertoken}"}
        if vtype == "episode":
            res = self.session.http.get(self._PRGM_API.format(vid),
                                        headers=auth_header)
            jsonres = self.session.http.json(res, schema=self._PRGM_SCHEMA)
            playable = False
            for item in jsonres["terms"]:
                if item.get("onDemandType", False) == 3:
                    playable = True
            return playable
        elif vtype == "slots":
            res = self.session.http.get(self._SLOTS_API.format(vid),
                                        headers=auth_header)
            jsonres = self.session.http.json(res, schema=self._SLOT_SCHEMA)
            return jsonres["slot"]["flags"].get("timeshiftFree", False) is True

    def _get_streams(self):
        deviceid = str(uuid.uuid4())
        appkeysecret = self._generate_applicationkeysecret(deviceid)
        json_data = {"deviceId": deviceid,
                     "applicationKeySecret": appkeysecret}
        res = self.session.http.post(self._USER_API, json=json_data)
        jsonres = self.session.http.json(res, schema=self._USER_SCHEMA)
        self.usertoken = jsonres["token"]  # for authorzation

        matchresult = self.match
        if matchresult.group("onair"):
            onair = matchresult.group("onair")
            if onair == "news-global":
                self._CHANNEL = update_qsd(self._CHANNEL, {"division": "1"})
            res = self.session.http.get(self._CHANNEL)
            jsonres = self.session.http.json(res, schema=self._CHANNEL_SCHEMA)
            channels = jsonres["channels"]
            for channel in channels:
                if onair == channel["id"]:
                    break
            else:
                raise NoStreamsError
            playlisturl = channel["playback"]["hls"]
        elif matchresult.group("episode"):
            episode = matchresult.group("episode")
            if not self._is_playable("episode", episode):
                log.error("Premium stream is not playable")
                return {}
            playlisturl = self._PRGM3U8.format(episode)
        elif matchresult.group("slots"):
            slots = matchresult.group("slots")
            if not self._is_playable("slots", slots):
                log.error("Premium stream is not playable")
                return {}
            playlisturl = self._SLOTM3U8.format(slots)

        log.debug("URL={0}".format(playlisturl))

        # hook abematv private protocol
        self.session.http.mount("abematv-license://",
                                AbemaTVLicenseAdapter(self.session, deviceid,
                                                      self.usertoken))

        return AbemaTVHLSStream.parse_variant_playlist(self.session, playlisturl)


__plugin__ = AbemaTV