BeatBot.js

const tmi = require('tmi.js')
const request = require('request')
const pattern = require('./pattern.json')

const version = '0.1.2'

var options = {
	options: {
		debug: true
	},
	connection: {
		reconnect: true
	},
	identity: {
		username: 'BOT_USERNAME_HERE',
		password: 'BOT_TOKEN_HERE'
	},
    channels: ['#YOUR_CHANNEL_HERE']
}

function getPatternizedMessage(beatmapInfo) {
	var message = ''
	for(let i = 0; i < pattern.length; i++) {
		switch(pattern[i]) {
			//TODO Escape HTML codes
			case '$authorName':
				message += beatmapInfo['authorName']
				break
			case '$beatname':
				message += beatmapInfo['beatname']
				break
			case '$beatsPerMinute':
				message += beatmapInfo['beatsPerMinute']
				break
			case '$beatText':
				message += beatmapInfo['beattext']
				break
			case '$downloadLink':
				message += 'https://beatsaver.com/dl.php?id=' + beatmapInfo['id']
				break
			case '$downloads':
				message += beatmapInfo['downloads']
				break
			case '$id':
				message += beatmapInfo['id']
				break
			case '$ownerID':
				message += beatmapInfo['ownerid']
				break
			case '$plays':
				message += beatmapInfo['plays']
				break
			case '$songName':
				message += beatmapInfo['songName']
				break
			case '$songSubName':
				message += beatmapInfo['songSubName']
				break
			case '$uploadTime':
				//TODO Format epoch time to standard date format
				message += beatmapInfo['uploadtime']
				break
			case '$upvotes':
				message += beatmapInfo['upvotes']
				break
			case '$webLink':
				message += 'https://beatsaver.com/details.php?id=' + beatmapInfo['id']
				break
			default:
				message += pattern[i]
				break
		}
	}

	return message
}

function getSearchResults(q, callback) {
	request({
		url: 'https://beatsaver.com/search.php?q=' + q,
		method: 'GET',
		headers: {
			'User-Agent': 'BeatBot/' + version,
			'Content-Type': 'application/json'
		}}, function(err, res, body) {
			if(!err && res.statusCode == 200) {
				callback(body)
			} else {
				console.log('Error ' + res.statusCode)
			}
		}
	)
}

function getBeatmapDetails(id, callback) {
	request({
		url: 'https://beatsaver.com/api.php?mode=details&id=' + id,
		method: 'GET',
		headers: {
			'User-Agent': 'BeatBot/' + version,
			'Content-Type': 'application/json'
		}},
		function(err, res, body) {
			if(!err && res.statusCode == 200) {
				callback(body)
			} else {
				console.log('Error ' + res.statusCode)
			}
		}
	)
}

var client = new tmi.client(options)

client.connect()

client.on('chat', function(channel, userstate, message, self) {
	const args = message.split(' ')

	if(self) return

	let prefix = '!'

	switch(args[0]) {
		case prefix + 'beatrequest':
			if(args.length > 1) {
				if(args.length == 2) {
					if(!isNaN(args[1]) && parseInt(Number(args[1])) == args[1] && !isNaN(parseInt(args[1], 10))) {
						getBeatmapDetails(args[1], function(body) {
							let beatmapInfo = JSON.parse(body)[0]
							client.say(channel, getPatternizedMessage(beatmapInfo))
						})
					}
					break
				}
				var q = ''
				for(let i = 1; i < args.length; i++) {
					q += args[i] + '%20'
				}
				getSearchResults(q, function(body) {
					let searchResults = JSON.parse(body)
					let id = searchResults['hits']['hits'][0]['_id'] 
					getBeatmapDetails(id, function(body) {
						let beatmapInfo = JSON.parse(body)[0]
						client.say(channel, getPatternizedMessage(beatmapInfo))
					})
				})
			} else {
				client.say(channel, userstate['display-name'] + ': Please specify a search query!')
			}
			break
		default:
			break
	}
})