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#!/usr/bin/env python3
#
# ZyklonB YouTube plugin, displaying info about YouTube links
#
# Copyright 2014 - 2015, Přemysl Janouch <p.janouch@gmail.com>
# See the file LICENSE for licensing information.
#

import sys
import io
import re
import json
import urllib.request

class Plugin:
	re_msg = re.compile ('(?::([^! ]*)(?:!([^@]*)@([^ ]*))? +)?'
		'([^ ]+)(?: +(.*))?\r\n$')
	re_args = re.compile (':?((?<=:).*|[^ ]+) *')

	def parse (self, line):
		m = self.re_msg.match (line)
		if m is None:
			return None

		(nick, user, host, command, args) = m.groups ()
		args = [] if args is None else self.re_args.findall (args)
		return (nick, user, host, command, args)

	def get_config (self, key):
		print ("ZYKLONB get_config :%s" % key)
		(_, _, _, _, args) = self.parse (sys.stdin.readline ())
		return args[0]

	def bot_print (self, what):
		print ('ZYKLONB print :%s' % what)

class YouTube (Plugin):
	re_videos = list (map (lambda x: re.compile (x), [
		r'youtube\.[a-z]+/[^ ]*[&?]v=([-\w]+)',
		r'youtube\.[a-z]+/v/([-\w]+)',
		r'youtu\.be/([-\w]+)'
	]))
	re_playlists = list (map (lambda x: re.compile (x), [
		r'youtube\.[a-z]+/playlist[&?][^ ]*(?<=&|\?)list=([-\w]+)',
	]))

	def print_info (self, channel, url, cb):
		try:
			data = json.loads (urllib.request.urlopen
				(url, None, 30).read ().decode ('utf-8'))

			for line in map (lambda x: "YouTube: " + cb (x), data['items']):
				print ("PRIVMSG %s :%s" % (channel,
					line.encode ('utf-8').decode ('iso8859-1')))

		except Exception as err:
			self.bot_print ('youtube: %s' % (err))

	def print_video_info (self, channel, video_id):
		url = 'https://www.googleapis.com/youtube/v3/' \
			+ 'videos?id=%s&key=%s&part=snippet,contentDetails,statistics' \
			% (video_id, self.youtube_api_key)
		self.print_info (channel, url, lambda x: "%s | %s | %sx" % (
			x['snippet']['title'],
			x['contentDetails']['duration'][2:].lower (),
			x['statistics']['viewCount']))

	def print_playlist_info (self, channel, playlist_id):
		url = 'https://www.googleapis.com/youtube/v3/' \
			+ 'playlists?id=%s&key=%s&part=snippet,contentDetails' \
			% (playlist_id, self.youtube_api_key)
		self.print_info (channel, url, lambda x: "%s | %d videos" % (
			x['snippet']['title'],
			x['contentDetails']['itemCount']))

	def process_line (self, line):
		msg = self.parse (line)
		if msg is None:
			return

		(nick, user, host, command, args) = msg
		if command != 'PRIVMSG' or len (args) < 2:
			return

		ctx = args[0]
		if not ctx.startswith (('#', '+', '&', '!')):
			ctx = nick

		for regex in self.re_videos:
			for i in regex.findall (args[1]):
				self.print_video_info (ctx, i)
		for regex in self.re_playlists:
			for i in regex.findall (args[1]):
				self.print_playlist_info (ctx, i)

	def run (self):
		self.youtube_api_key = self.get_config ('youtube_api_key')
		if self.youtube_api_key == "":
			self.bot_print ("youtube: missing `youtube_api_key'")

		print ("ZYKLONB register")

		for line in sys.stdin:
			self.process_line (line)

sys.stdin = io.TextIOWrapper (sys.__stdin__.buffer,
	encoding = 'iso8859-1', newline = '\r\n', line_buffering = True)
sys.stdout = io.TextIOWrapper (sys.__stdout__.buffer,
	encoding = 'iso8859-1', newline = '\r\n', line_buffering = True)

YouTube ().run ()