# coding: utf-8
from __future__ import unicode_literals

import re
import time
import itertools

from .common import InfoExtractor
from ..compat import (
	compat_urllib_parse_urlencode,
	compat_str,
)
from ..utils import (
	dict_get,
	ExtractorError,
	float_or_none,
	int_or_none,
	remove_start,
	try_get,
	urlencode_postdata,
)


class VLiveIE(InfoExtractor):
	IE_NAME = 'vlive'
	_VALID_URL = r'https?://(?:(?:www|m)\.)?vlive\.tv/video/(?P<id>[0-9]+)'
	_TESTS = [{
		'url': 'http://www.vlive.tv/video/1326',
		'md5': 'cc7314812855ce56de70a06a27314983',
		'info_dict': {
			'id': '1326',
			'ext': 'mp4',
			'title': "[V LIVE] Girl's Day's Broadcast",
			'creator': "Girl's Day",
			'view_count': int,
		},
	}, {
		'url': 'http://www.vlive.tv/video/16937',
		'info_dict': {
			'id': '16937',
			'ext': 'mp4',
			'title': '[V LIVE] 첸백시 걍방',
			'creator': 'EXO',
			'view_count': int,
			'subtitles': 'mincount:12',
		},
		'params': {
			'skip_download': True,
		},
	}]

	@classmethod
	def suitable(cls, url):
		return False if VLivePlaylistIE.suitable(url) else super(VLiveIE, cls).suitable(url)

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

		webpage = self._download_webpage(
			'https://www.vlive.tv/video/%s' % video_id, video_id)

		VIDEO_PARAMS_RE = r'\bvlive\.video\.init\(([^)]+)'
		VIDEO_PARAMS_FIELD = 'video params'

		params = self._parse_json(self._search_regex(
			VIDEO_PARAMS_RE, webpage, VIDEO_PARAMS_FIELD, default=''), video_id,
			transform_source=lambda s: '[' + s + ']', fatal=False)

		if not params or len(params) < 7:
			params = self._search_regex(
				VIDEO_PARAMS_RE, webpage, VIDEO_PARAMS_FIELD)
			params = [p.strip(r'"') for p in re.split(r'\s*,\s*', params)]

		status, long_video_id, key = params[2], params[5], params[6]
		status = remove_start(status, 'PRODUCT_')

		if status in ('LIVE_ON_AIR', 'BIG_EVENT_ON_AIR'):
			return self._live(video_id, webpage)
		elif status in ('VOD_ON_AIR', 'BIG_EVENT_INTRO'):
			if long_video_id and key:
				return self._replay(video_id, webpage, long_video_id, key)
			else:
				status = 'COMING_SOON'

		if status == 'LIVE_END':
			raise ExtractorError('Uploading for replay. Please wait...',
													 expected=True)
		elif status == 'COMING_SOON':
			raise ExtractorError('Coming soon!', expected=True)
		elif status == 'CANCELED':
			raise ExtractorError('We are sorry, '
													 'but the live broadcast has been canceled.',
													 expected=True)
		else:
			raise ExtractorError('Unknown status %s' % status)

	def _get_common_fields(self, webpage):
		title = self._og_search_title(webpage)
		creator = self._html_search_regex(
			r'<div[^>]+class="info_area"[^>]*>\s*<a\s+[^>]*>([^<]+)',
			webpage, 'creator', fatal=False)
		thumbnail = self._og_search_thumbnail(webpage)
		return {
			'title': title,
			'creator': creator,
			'thumbnail': thumbnail,
		}

	def _live(self, video_id, webpage):
		init_page = self._download_webpage(
			'https://www.vlive.tv/video/init/view',
			video_id, note='Downloading live webpage',
			data=urlencode_postdata({'videoSeq': video_id}),
			headers={
				'Referer': 'https://www.vlive.tv/video/%s' % video_id,
				'Content-Type': 'application/x-www-form-urlencoded'
			})

		live_params = self._search_regex(
			r'"liveStreamInfo"\s*:\s*(".*"),',
			init_page, 'live stream info')
		live_params = self._parse_json(live_params, video_id)
		live_params = self._parse_json(live_params, video_id)

		formats = []
		for vid in live_params.get('resolutions', []):
			formats.extend(self._extract_m3u8_formats(
				vid['cdnUrl'], video_id, 'mp4',
				m3u8_id=vid.get('name'),
				fatal=False, live=True))
		self._sort_formats(formats)

		info = self._get_common_fields(webpage)
		info.update({
			'title': self._live_title(info['title']),
			'id': video_id,
			'formats': formats,
			'is_live': True,
		})
		return info

	def _replay(self, video_id, webpage, long_video_id, key):
		playinfo = self._download_json(
			'http://global.apis.naver.com/rmcnmv/rmcnmv/vod_play_videoInfo.json?%s'
			% compat_urllib_parse_urlencode({
				'videoId': long_video_id,
				'key': key,
				'ptc': 'http',
				'doct': 'json',  # document type (xml or json)
				'cpt': 'vtt',  # captions type (vtt or ttml)
			}), video_id)

		formats = [{
			'url': vid['source'],
			'format_id': vid.get('encodingOption', {}).get('name'),
			'abr': float_or_none(vid.get('bitrate', {}).get('audio')),
			'vbr': float_or_none(vid.get('bitrate', {}).get('video')),
			'width': int_or_none(vid.get('encodingOption', {}).get('width')),
			'height': int_or_none(vid.get('encodingOption', {}).get('height')),
			'filesize': int_or_none(vid.get('size')),
		} for vid in playinfo.get('videos', {}).get('list', []) if vid.get('source')]
		self._sort_formats(formats)

		view_count = int_or_none(playinfo.get('meta', {}).get('count'))

		subtitles = {}
		for caption in playinfo.get('captions', {}).get('list', []):
			lang = dict_get(caption, ('locale', 'language', 'country', 'label'))
			if lang and caption.get('source'):
				subtitles[lang] = [{
					'ext': 'vtt',
					'url': caption['source']}]

		info = self._get_common_fields(webpage)
		info.update({
			'id': video_id,
			'formats': formats,
			'view_count': view_count,
			'subtitles': subtitles,
		})
		return info


class VLiveChannelIE(InfoExtractor):
	IE_NAME = 'vlive:channel'
	_VALID_URL = r'https?://channels\.vlive\.tv/(?P<id>[0-9A-Z]+)'
	_TEST = {
		'url': 'http://channels.vlive.tv/FCD4B',
		'info_dict': {
			'id': 'FCD4B',
			'title': 'MAMAMOO',
		},
		'playlist_mincount': 110
	}
	_APP_ID = '8c6cc7b45d2568fb668be6e05b6e5a3b'

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

		webpage = self._download_webpage(
			'http://channels.vlive.tv/%s/video' % channel_code, channel_code)

		app_id = None

		app_js_url = self._search_regex(
			r'<script[^>]+src=(["\'])(?P<url>http.+?/app\.js.*?)\1',
			webpage, 'app js', default=None, group='url')

		if app_js_url:
			app_js = self._download_webpage(
				app_js_url, channel_code, 'Downloading app JS', fatal=False)
			if app_js:
				app_id = self._search_regex(
					r'Global\.VFAN_APP_ID\s*=\s*[\'"]([^\'"]+)[\'"]',
					app_js, 'app id', default=None)

		app_id = app_id or self._APP_ID

		channel_info = self._download_json(
			'http://api.vfan.vlive.tv/vproxy/channelplus/decodeChannelCode',
			channel_code, note='Downloading decode channel code',
			query={
				'app_id': app_id,
				'channelCode': channel_code,
				'_': int(time.time())
			})

		channel_seq = channel_info['result']['channelSeq']
		channel_name = None
		entries = []

		for page_num in itertools.count(1):
			video_list = self._download_json(
				'http://api.vfan.vlive.tv/vproxy/channelplus/getChannelVideoList',
				channel_code, note='Downloading channel list page #%d' % page_num,
				query={
					'app_id': app_id,
					'channelSeq': channel_seq,
					# Large values of maxNumOfRows (~300 or above) may cause
					# empty responses (see [1]), e.g. this happens for [2] that
					# has more than 300 videos.
					# 1. https://github.com/rg3/youtube-dl/issues/13830
					# 2. http://channels.vlive.tv/EDBF.
					'maxNumOfRows': 100,
					'_': int(time.time()),
					'pageNo': page_num
				}
			)

			if not channel_name:
				channel_name = try_get(
					video_list,
					lambda x: x['result']['channelInfo']['channelName'],
					compat_str)

			videos = try_get(
				video_list, lambda x: x['result']['videoList'], list)
			if not videos:
				break

			for video in videos:
				video_id = video.get('videoSeq')
				if not video_id:
					continue
				video_id = compat_str(video_id)
				entries.append(
					self.url_result(
						'http://www.vlive.tv/video/%s' % video_id,
						ie=VLiveIE.ie_key(), video_id=video_id))

		return self.playlist_result(
			entries, channel_code, channel_name)


class VLivePlaylistIE(InfoExtractor):
	IE_NAME = 'vlive:playlist'
	_VALID_URL = r'https?://(?:(?:www|m)\.)?vlive\.tv/video/(?P<video_id>[0-9]+)/playlist/(?P<id>[0-9]+)'
	_TEST = {
		'url': 'http://www.vlive.tv/video/22867/playlist/22912',
		'info_dict': {
			'id': '22912',
			'title': 'Valentine Day Message from TWICE'
		},
		'playlist_mincount': 9
	}

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

		VIDEO_URL_TEMPLATE = 'http://www.vlive.tv/video/%s'
		if self._downloader.params.get('noplaylist'):
			self.to_screen(
				'Downloading just video %s because of --no-playlist' % video_id)
			return self.url_result(
				VIDEO_URL_TEMPLATE % video_id,
				ie=VLiveIE.ie_key(), video_id=video_id)

		self.to_screen(
			'Downloading playlist %s - add --no-playlist to just download video'
			% playlist_id)

		webpage = self._download_webpage(
			'http://www.vlive.tv/video/%s/playlist/%s'
			% (video_id, playlist_id), playlist_id)

		item_ids = self._parse_json(
			self._search_regex(
				r'playlistVideoSeqs\s*=\s*(\[[^]]+\])', webpage,
				'playlist video seqs'),
			playlist_id)

		entries = [
			self.url_result(
				VIDEO_URL_TEMPLATE % item_id, ie=VLiveIE.ie_key(),
				video_id=compat_str(item_id))
			for item_id in item_ids]

		playlist_name = self._html_search_regex(
			r'<div[^>]+class="[^"]*multicam_playlist[^>]*>\s*<h3[^>]+>([^<]+)',
			webpage, 'playlist title', fatal=False)

		return self.playlist_result(entries, playlist_id, playlist_name)
