/*jslint node: true */
"use strict";

var path    = require('path');
var request = require('request');
var cheerio = require('cheerio');
var ytdl    = require('ytdl-core');
var ffmpeg  = require('fluent-ffmpeg');
var rimraf  = require('rimraf');
var fs      = require('fs');

class Radio_Source_YouTube {
	static getName() { return "YouTube"; }

	static canHandle(uri) {
		let firstMatch  = /https?:\/\/(www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9-_]+)/.test(uri);
		let secondMatch = /https?:\/\/(www\.)?youtu\.be\/([a-zA-Z0-9-_]+)/.test(uri);
		return firstMatch || secondMatch;
	}

	static search(query, radio, callback) {
		callback(null, []);
	}

	static metadata(uri, radio, callback) {
		request(uri, (err, response, body) => {
			if(err || response.statusCode != 200)
				return callback("unable to obtain page");

			let $ = cheerio.load(body);
			let title = $('title').text().replace(/[\r\n]/g, "").trim();
			if(title.indexOf(" - YouTube") === -1)
				return callback("unable to obtain metadata from page");

			let trackTitleArtist = radio.trackFromTitleString(title.replace(" - YouTube", ""));
			callback(null, {
				id     : Date.now() + "_" + (Math.random() * 1000000000 | 0),
				name   : trackTitleArtist[0],
				artist : trackTitleArtist[1]
			});
		});
	}

	static download(uri, id, radio, callback) {
		let temporaryFileMP4 = path.join(radio.temporaryFolder, id + ".m4a");
		let temporaryFileMP3 = path.join(radio.temporaryFolder, id + ".mp3");

		try {
			fs.accessSync("/home/node/ffmpeg/ffmpeg", fs.R_OK | fs.X_OK);
			process.env.FFMPEG_PATH = "/home/node/ffmpeg/ffmpeg";
		} catch (e) { }

		ytdl(uri, {quality: [141, 140, "highest"]})
			.on('error', err => callback(err))
			.on('finish', () => {
				ffmpeg().input(temporaryFileMP4)
					.withNoVideo()
					.withAudioBitrate('256k')
					.withAudioChannels(2)
					.withAudioFrequency(48000)
					.withAudioQuality(5)
					.fromFormat('m4a')
					.toFormat('mp3')
					.save(temporaryFileMP3)
					.on('error', (err) => callback(err))
					.on('end', () => {
						rimraf(temporaryFileMP4, () => callback(null, true));
					});
			})
			.pipe(require('fs').createWriteStream(temporaryFileMP4));
	}
}

module.exports = Radio_Source_YouTube;