# encoding: utf-8
from __future__ import unicode_literals

import re
import json
import base64
import zlib

from hashlib import sha1
from math import pow, sqrt, floor
from .common import InfoExtractor
from ..compat import (
    compat_etree_fromstring,
    compat_urllib_parse_urlencode,
    compat_urllib_request,
    compat_urlparse,
)
from ..utils import (
    ExtractorError,
    bytes_to_intlist,
    intlist_to_bytes,
    int_or_none,
    lowercase_escape,
    remove_end,
    sanitized_Request,
    unified_strdate,
    urlencode_postdata,
    xpath_text,
    extract_attributes,
)
from ..aes import (
    aes_cbc_decrypt,
)


class CrunchyrollBaseIE(InfoExtractor):
    _LOGIN_URL = 'https://www.crunchyroll.com/login'
    _LOGIN_FORM = 'login_form'
    _NETRC_MACHINE = 'crunchyroll'

    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')

        def is_logged(webpage):
            return '<title>Redirecting' in webpage

        # Already logged in
        if is_logged(login_page):
            return

        login_form_str = self._search_regex(
            r'(?P<form><form[^>]+?id=(["\'])%s\2[^>]*>)' % self._LOGIN_FORM,
            login_page, 'login form', group='form')

        post_url = extract_attributes(login_form_str).get('action')
        if not post_url:
            post_url = self._LOGIN_URL
        elif not post_url.startswith('http'):
            post_url = compat_urlparse.urljoin(self._LOGIN_URL, post_url)

        login_form = self._form_hidden_inputs(self._LOGIN_FORM, login_page)

        login_form.update({
            'login_form[name]': username,
            'login_form[password]': password,
        })

        response = self._download_webpage(
            post_url, None, 'Logging in', 'Wrong login info',
            data=urlencode_postdata(login_form),
            headers={'Content-Type': 'application/x-www-form-urlencoded'})

        # Successful login
        if is_logged(response):
            return

        error = self._html_search_regex(
            '(?s)<ul[^>]+class=["\']messages["\'][^>]*>(.+?)</ul>',
            response, 'error message', default=None)
        if error:
            raise ExtractorError('Unable to login: %s' % error, expected=True)

        raise ExtractorError('Unable to log in')

    def _real_initialize(self):
        self._login()

    def _download_webpage(self, url_or_request, *args, **kwargs):
        request = (url_or_request if isinstance(url_or_request, compat_urllib_request.Request)
                   else sanitized_Request(url_or_request))
        # Accept-Language must be set explicitly to accept any language to avoid issues
        # similar to https://github.com/rg3/youtube-dl/issues/6797.
        # Along with IP address Crunchyroll uses Accept-Language to guess whether georestriction
        # should be imposed or not (from what I can see it just takes the first language
        # ignoring the priority and requires it to correspond the IP). By the way this causes
        # Crunchyroll to not work in georestriction cases in some browsers that don't place
        # the locale lang first in header. However allowing any language seems to workaround the issue.
        request.add_header('Accept-Language', '*')
        return super(CrunchyrollBaseIE, self)._download_webpage(request, *args, **kwargs)

    @staticmethod
    def _add_skip_wall(url):
        parsed_url = compat_urlparse.urlparse(url)
        qs = compat_urlparse.parse_qs(parsed_url.query)
        # Always force skip_wall to bypass maturity wall, namely 18+ confirmation message:
        # > This content may be inappropriate for some people.
        # > Are you sure you want to continue?
        # since it's not disabled by default in crunchyroll account's settings.
        # See https://github.com/rg3/youtube-dl/issues/7202.
        qs['skip_wall'] = ['1']
        return compat_urlparse.urlunparse(
            parsed_url._replace(query=compat_urllib_parse_urlencode(qs, True)))


class CrunchyrollIE(CrunchyrollBaseIE):
    _VALID_URL = r'https?://(?:(?P<prefix>www|m)\.)?(?P<url>crunchyroll\.(?:com|fr)/(?:media(?:-|/\?id=)|[^/]*/[^/?&]*?)(?P<video_id>[0-9]+))(?:[/?&]|$)'
    _TESTS = [{
        'url': 'http://www.crunchyroll.com/wanna-be-the-strongest-in-the-world/episode-1-an-idol-wrestler-is-born-645513',
        'info_dict': {
            'id': '645513',
            'ext': 'flv',
            'title': 'Wanna be the Strongest in the World Episode 1 – An Idol-Wrestler is Born!',
            'description': 'md5:2d17137920c64f2f49981a7797d275ef',
            'thumbnail': 'http://img1.ak.crunchyroll.com/i/spire1-tmb/20c6b5e10f1a47b10516877d3c039cae1380951166_full.jpg',
            'uploader': 'Yomiuri Telecasting Corporation (YTV)',
            'upload_date': '20131013',
            'url': 're:(?!.*&amp)',
        },
        'params': {
            # rtmp
            'skip_download': True,
        },
    }, {
        'url': 'http://www.crunchyroll.com/media-589804/culture-japan-1',
        'info_dict': {
            'id': '589804',
            'ext': 'flv',
            'title': 'Culture Japan Episode 1 – Rebuilding Japan after the 3.11',
            'description': 'md5:2fbc01f90b87e8e9137296f37b461c12',
            'thumbnail': 're:^https?://.*\.jpg$',
            'uploader': 'Danny Choo Network',
            'upload_date': '20120213',
        },
        'params': {
            # rtmp
            'skip_download': True,
        },
    }, {
        'url': 'http://www.crunchyroll.com/rezero-starting-life-in-another-world-/episode-5-the-morning-of-our-promise-is-still-distant-702409',
        'info_dict': {
            'id': '702409',
            'ext': 'mp4',
            'title': 'Re:ZERO -Starting Life in Another World- Episode 5 – The Morning of Our Promise Is Still Distant',
            'description': 'md5:97664de1ab24bbf77a9c01918cb7dca9',
            'thumbnail': 're:^https?://.*\.jpg$',
            'uploader': 'TV TOKYO',
            'upload_date': '20160508',
        },
        'params': {
            # m3u8 download
            'skip_download': True,
        },
    }, {
        'url': 'http://www.crunchyroll.fr/girl-friend-beta/episode-11-goodbye-la-mode-661697',
        'only_matching': True,
    }, {
        # geo-restricted (US), 18+ maturity wall, non-premium available
        'url': 'http://www.crunchyroll.com/cosplay-complex-ova/episode-1-the-birth-of-the-cosplay-club-565617',
        'only_matching': True,
    }]

    _FORMAT_IDS = {
        '360': ('60', '106'),
        '480': ('61', '106'),
        '720': ('62', '106'),
        '1080': ('80', '108'),
    }

    def _decrypt_subtitles(self, data, iv, id):
        data = bytes_to_intlist(base64.b64decode(data.encode('utf-8')))
        iv = bytes_to_intlist(base64.b64decode(iv.encode('utf-8')))
        id = int(id)

        def obfuscate_key_aux(count, modulo, start):
            output = list(start)
            for _ in range(count):
                output.append(output[-1] + output[-2])
            # cut off start values
            output = output[2:]
            output = list(map(lambda x: x % modulo + 33, output))
            return output

        def obfuscate_key(key):
            num1 = int(floor(pow(2, 25) * sqrt(6.9)))
            num2 = (num1 ^ key) << 5
            num3 = key ^ num1
            num4 = num3 ^ (num3 >> 3) ^ num2
            prefix = intlist_to_bytes(obfuscate_key_aux(20, 97, (1, 2)))
            shaHash = bytes_to_intlist(sha1(prefix + str(num4).encode('ascii')).digest())
            # Extend 160 Bit hash to 256 Bit
            return shaHash + [0] * 12

        key = obfuscate_key(id)

        decrypted_data = intlist_to_bytes(aes_cbc_decrypt(data, key, iv))
        return zlib.decompress(decrypted_data)

    def _convert_subtitles_to_srt(self, sub_root):
        output = ''

        for i, event in enumerate(sub_root.findall('./events/event'), 1):
            start = event.attrib['start'].replace('.', ',')
            end = event.attrib['end'].replace('.', ',')
            text = event.attrib['text'].replace('\\N', '\n')
            output += '%d\n%s --> %s\n%s\n\n' % (i, start, end, text)
        return output

    def _convert_subtitles_to_ass(self, sub_root):
        output = ''

        def ass_bool(strvalue):
            assvalue = '0'
            if strvalue == '1':
                assvalue = '-1'
            return assvalue

        output = '[Script Info]\n'
        output += 'Title: %s\n' % sub_root.attrib['title']
        output += 'ScriptType: v4.00+\n'
        output += 'WrapStyle: %s\n' % sub_root.attrib['wrap_style']
        output += 'PlayResX: %s\n' % sub_root.attrib['play_res_x']
        output += 'PlayResY: %s\n' % sub_root.attrib['play_res_y']
        output += """ScaledBorderAndShadow: yes

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
"""
        for style in sub_root.findall('./styles/style'):
            output += 'Style: ' + style.attrib['name']
            output += ',' + style.attrib['font_name']
            output += ',' + style.attrib['font_size']
            output += ',' + style.attrib['primary_colour']
            output += ',' + style.attrib['secondary_colour']
            output += ',' + style.attrib['outline_colour']
            output += ',' + style.attrib['back_colour']
            output += ',' + ass_bool(style.attrib['bold'])
            output += ',' + ass_bool(style.attrib['italic'])
            output += ',' + ass_bool(style.attrib['underline'])
            output += ',' + ass_bool(style.attrib['strikeout'])
            output += ',' + style.attrib['scale_x']
            output += ',' + style.attrib['scale_y']
            output += ',' + style.attrib['spacing']
            output += ',' + style.attrib['angle']
            output += ',' + style.attrib['border_style']
            output += ',' + style.attrib['outline']
            output += ',' + style.attrib['shadow']
            output += ',' + style.attrib['alignment']
            output += ',' + style.attrib['margin_l']
            output += ',' + style.attrib['margin_r']
            output += ',' + style.attrib['margin_v']
            output += ',' + style.attrib['encoding']
            output += '\n'

        output += """
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
"""
        for event in sub_root.findall('./events/event'):
            output += 'Dialogue: 0'
            output += ',' + event.attrib['start']
            output += ',' + event.attrib['end']
            output += ',' + event.attrib['style']
            output += ',' + event.attrib['name']
            output += ',' + event.attrib['margin_l']
            output += ',' + event.attrib['margin_r']
            output += ',' + event.attrib['margin_v']
            output += ',' + event.attrib['effect']
            output += ',' + event.attrib['text']
            output += '\n'

        return output

    def _extract_subtitles(self, subtitle):
        sub_root = compat_etree_fromstring(subtitle)
        return [{
            'ext': 'srt',
            'data': self._convert_subtitles_to_srt(sub_root),
        }, {
            'ext': 'ass',
            'data': self._convert_subtitles_to_ass(sub_root),
        }]

    def _get_subtitles(self, video_id, webpage):
        subtitles = {}
        for sub_id, sub_name in re.findall(r'\bssid=([0-9]+)"[^>]+?\btitle="([^"]+)', webpage):
            sub_page = self._download_webpage(
                'http://www.crunchyroll.com/xml/?req=RpcApiSubtitle_GetXml&subtitle_script_id=' + sub_id,
                video_id, note='Downloading subtitles for ' + sub_name)
            id = self._search_regex(r'id=\'([0-9]+)', sub_page, 'subtitle_id', fatal=False)
            iv = self._search_regex(r'<iv>([^<]+)', sub_page, 'subtitle_iv', fatal=False)
            data = self._search_regex(r'<data>([^<]+)', sub_page, 'subtitle_data', fatal=False)
            if not id or not iv or not data:
                continue
            subtitle = self._decrypt_subtitles(data, iv, id).decode('utf-8')
            lang_code = self._search_regex(r'lang_code=["\']([^"\']+)', subtitle, 'subtitle_lang_code', fatal=False)
            if not lang_code:
                continue
            subtitles[lang_code] = self._extract_subtitles(subtitle)
        return subtitles

    def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        video_id = mobj.group('video_id')

        if mobj.group('prefix') == 'm':
            mobile_webpage = self._download_webpage(url, video_id, 'Downloading mobile webpage')
            webpage_url = self._search_regex(r'<link rel="canonical" href="([^"]+)" />', mobile_webpage, 'webpage_url')
        else:
            webpage_url = 'http://www.' + mobj.group('url')

        webpage = self._download_webpage(self._add_skip_wall(webpage_url), video_id, 'Downloading webpage')
        note_m = self._html_search_regex(
            r'<div class="showmedia-trailer-notice">(.+?)</div>',
            webpage, 'trailer-notice', default='')
        if note_m:
            raise ExtractorError(note_m)

        mobj = re.search(r'Page\.messaging_box_controller\.addItems\(\[(?P<msg>{.+?})\]\)', webpage)
        if mobj:
            msg = json.loads(mobj.group('msg'))
            if msg.get('type') == 'error':
                raise ExtractorError('crunchyroll returned error: %s' % msg['message_body'], expected=True)

        if 'To view this, please log in to verify you are 18 or older.' in webpage:
            self.raise_login_required()

        video_title = self._html_search_regex(
            r'(?s)<h1[^>]*>((?:(?!<h1).)*?<span[^>]+itemprop=["\']title["\'][^>]*>(?:(?!<h1).)+?)</h1>',
            webpage, 'video_title')
        video_title = re.sub(r' {2,}', ' ', video_title)
        video_description = self._html_search_regex(
            r'<script[^>]*>\s*.+?\[media_id=%s\].+?"description"\s*:\s*"([^"]+)' % video_id,
            webpage, 'description', default=None)
        if video_description:
            video_description = lowercase_escape(video_description.replace(r'\r\n', '\n'))
        video_upload_date = self._html_search_regex(
            [r'<div>Availability for free users:(.+?)</div>', r'<div>[^<>]+<span>\s*(.+?\d{4})\s*</span></div>'],
            webpage, 'video_upload_date', fatal=False, flags=re.DOTALL)
        if video_upload_date:
            video_upload_date = unified_strdate(video_upload_date)
        video_uploader = self._html_search_regex(
            r'<a[^>]+href="/publisher/[^"]+"[^>]*>([^<]+)</a>', webpage,
            'video_uploader', fatal=False)

        available_fmts = []
        for a, fmt in re.findall(r'(<a[^>]+token=["\']showmedia\.([0-9]{3,4})p["\'][^>]+>)', webpage):
            attrs = extract_attributes(a)
            href = attrs.get('href')
            if href and '/freetrial' in href:
                continue
            available_fmts.append(fmt)
        if not available_fmts:
            for p in (r'token=["\']showmedia\.([0-9]{3,4})p"', r'showmedia\.([0-9]{3,4})p'):
                available_fmts = re.findall(p, webpage)
                if available_fmts:
                    break
        video_encode_ids = []
        formats = []
        for fmt in available_fmts:
            stream_quality, stream_format = self._FORMAT_IDS[fmt]
            video_format = fmt + 'p'
            streamdata_req = sanitized_Request(
                'http://www.crunchyroll.com/xml/?req=RpcApiVideoPlayer_GetStandardConfig&media_id=%s&video_format=%s&video_quality=%s'
                % (video_id, stream_format, stream_quality),
                compat_urllib_parse_urlencode({'current_page': url}).encode('utf-8'))
            streamdata_req.add_header('Content-Type', 'application/x-www-form-urlencoded')
            streamdata = self._download_xml(
                streamdata_req, video_id,
                note='Downloading media info for %s' % video_format)
            stream_info = streamdata.find('./{default}preload/stream_info')
            video_encode_id = xpath_text(stream_info, './video_encode_id')
            if video_encode_id in video_encode_ids:
                continue
            video_encode_ids.append(video_encode_id)

            video_file = xpath_text(stream_info, './file')
            if not video_file:
                continue
            if video_file.startswith('http'):
                formats.extend(self._extract_m3u8_formats(
                    video_file, video_id, 'mp4', entry_protocol='m3u8_native',
                    m3u8_id='hls', fatal=False))
                continue

            video_url = xpath_text(stream_info, './host')
            if not video_url:
                continue
            metadata = stream_info.find('./metadata')
            format_info = {
                'format': video_format,
                'format_id': video_format,
                'height': int_or_none(xpath_text(metadata, './height')),
                'width': int_or_none(xpath_text(metadata, './width')),
            }

            if '.fplive.net/' in video_url:
                video_url = re.sub(r'^rtmpe?://', 'http://', video_url.strip())
                parsed_video_url = compat_urlparse.urlparse(video_url)
                direct_video_url = compat_urlparse.urlunparse(parsed_video_url._replace(
                    netloc='v.lvlt.crcdn.net',
                    path='%s/%s' % (remove_end(parsed_video_url.path, '/'), video_file.split(':')[-1])))
                if self._is_valid_url(direct_video_url, video_id, video_format):
                    format_info.update({
                        'url': direct_video_url,
                    })
                    formats.append(format_info)
                    continue

            format_info.update({
                'url': video_url,
                'play_path': video_file,
                'ext': 'flv',
            })
            formats.append(format_info)
        self._sort_formats(formats)

        metadata = self._download_xml(
            'http://www.crunchyroll.com/xml', video_id,
            note='Downloading media info', query={
                'req': 'RpcApiVideoPlayer_GetMediaMetadata',
                'media_id': video_id,
            })

        subtitles = self.extract_subtitles(video_id, webpage)

        return {
            'id': video_id,
            'title': video_title,
            'description': video_description,
            'thumbnail': xpath_text(metadata, 'episode_image_url'),
            'uploader': video_uploader,
            'upload_date': video_upload_date,
            'series': xpath_text(metadata, 'series_title'),
            'episode': xpath_text(metadata, 'episode_title'),
            'episode_number': int_or_none(xpath_text(metadata, 'episode_number')),
            'subtitles': subtitles,
            'formats': formats,
        }


class CrunchyrollShowPlaylistIE(CrunchyrollBaseIE):
    IE_NAME = 'crunchyroll:playlist'
    _VALID_URL = r'https?://(?:(?P<prefix>www|m)\.)?(?P<url>crunchyroll\.com/(?!(?:news|anime-news|library|forum|launchcalendar|lineup|store|comics|freetrial|login))(?P<id>[\w\-]+))/?(?:\?|$)'

    _TESTS = [{
        'url': 'http://www.crunchyroll.com/a-bridge-to-the-starry-skies-hoshizora-e-kakaru-hashi',
        'info_dict': {
            'id': 'a-bridge-to-the-starry-skies-hoshizora-e-kakaru-hashi',
            'title': 'A Bridge to the Starry Skies - Hoshizora e Kakaru Hashi'
        },
        'playlist_count': 13,
    }, {
        # geo-restricted (US), 18+ maturity wall, non-premium available
        'url': 'http://www.crunchyroll.com/cosplay-complex-ova',
        'info_dict': {
            'id': 'cosplay-complex-ova',
            'title': 'Cosplay Complex OVA'
        },
        'playlist_count': 3,
        'skip': 'Georestricted',
    }, {
        # geo-restricted (US), 18+ maturity wall, non-premium will be available since 2015.11.14
        'url': 'http://www.crunchyroll.com/ladies-versus-butlers?skip_wall=1',
        'only_matching': True,
    }]

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

        webpage = self._download_webpage(self._add_skip_wall(url), show_id)
        title = self._html_search_regex(
            r'(?s)<h1[^>]*>\s*<span itemprop="name">(.*?)</span>',
            webpage, 'title')
        episode_paths = re.findall(
            r'(?s)<li id="showview_videos_media_[0-9]+"[^>]+>.*?<a href="([^"]+)"',
            webpage)
        entries = [
            self.url_result('http://www.crunchyroll.com' + ep, 'Crunchyroll')
            for ep in episode_paths
        ]
        entries.reverse()

        return {
            '_type': 'playlist',
            'id': show_id,
            'title': title,
            'entries': entries,
        }