const fs = require('fs');
const tmi = require('tmi.js');
const moment = require('moment');

// Twitch bot options
const optsFile = fs.readFileSync('twitch.config');
const opts = JSON.parse(optsFile);

const client = tmi.client(opts);

// Buttsbot options
const syllableRegex = /[^aeiouy]*[aeiouy]+(?:[^aeiouy]*$|[^aeiouy](?=[^aeiouy]))?/gi;

let configFile = fs.readFileSync('buttsbot.config')
let config = JSON.parse(configFile);

console.log(`* Startup: Loaded config: ${config}`);

let lastMessageButtified = 0;

// Client
client.on('message', onMessageHandler);
client.on('connected', onConnectedHandler);

client.connect();

// Helper methods
function syllabify(words) {
    return words.match(syllableRegex);
}

function randomIntFromInterval(min, max) { // min and max included
    return Math.floor(Math.random() * (max - min + 1) + min)
}

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

// Event handlers
function onMessageHandler (channel, userstate, message, self) {
	if (self) { return; }

	var trimmedMessage = message.trim();

	if (trimmedMessage.startsWith("!buttsbot")) {
		if (userstate['room-id'] === userstate['user-id'] || userstate['mod']) {
		
			var parts = trimmedMessage.split(' ');
			var action = parts[1];
			var value = parts[2];

			switch (action) {
				case "config":
					client.say(channel, "Timer: " + config.timer + " - Limit: " + config.limit + " - Ignored Users: " + config.ignoredUsers.join(', '));
					break;
				case "timer":
					if (isNumeric(value)) {
						config.timer = parseInt(value)
						fs.writeFileSync('buttsbot.config', JSON.stringify(config));
						client.say(channel, "Set new timer to " + value + " seconds.")
					} else {
						client.say(channel, "Expected a number, got " + value);
					}
					break;
				case "ignore":
					if (value && value !== "") {
						console.log(`* ignore: value ok`);
						value = value.replace("@", "");
						if (!config.ignoredUsers.includes(value)) {
							console.log(`* ignore: value not already ignored`);
							config.ignoredUsers.push(value);
							fs.writeFileSync('buttsbot.config', JSON.stringify(config));	
						}
						client.say(channel, "User " + value + " will be ignored from now on.");
					} else {
						client.say(channel, "Excepted username, got empty value");
					}
					break;
				case "rmignore":
					if (value && value !== "") {
						console.log(`* rmignore: value ok`);
						value = value.replace("@", "");
						if (config.ignoredUsers.includes(value)) {
							console.log(`* rmignore: value ignored`);
							
							let index = config.ignoredUsers.indexOf(value);
							config.ignoredUsers.splice(index, 1);

							fs.writeFileSync('buttsbot.config', JSON.stringify(config));
						}
						client.say(channel, "User " + value + " will no longer be ignored.");
					} else {
						client.say(channel, "Expected username, got empty value");
					}
					break;
				case "limit":
					if (isNumeric(value)) {
						config.limit = parseInt(value);
						fs.writeFileSync('buttsbot.config', JSON.stringify(config));
						client.say(channel, "Set new limit: 1 butt per " + value + " words");
					} else {
						client.say(channel, "Expected a number, got " + value);
					}
					break;
				default:
					client.say(channel, "Action '" + action + "' not recognized.");
			}
		} else {
			console.log(`* buttsbot: User not authorized`);
		}
	} else {
		if (config.ignoredUsers.includes(userstate['display-name']) || config.ignoredUsers.includes(userstate['username'])) {
			console.log(`* User ${userstate['username']} is on the ignore list.`);
			return;
		}

		var checkDate = moment().subtract(config.timer, 'seconds');
	
		if (checkDate < lastMessageButtified)
			return;

		if (trimmedMessage.startsWith("!"))
			return;

		var words = trimmedMessage.split(' ');
    		var syllables = words.map(syllabify);

    		var buttCount = Math.ceil(words.length / config.limit);

    		var randomNumbersUsed = [];

    		for (var i = 0; i < buttCount; i++) {

        		var random = randomIntFromInterval(1, words.length);

        		while (randomNumbersUsed.includes(random)) random = randomIntFromInterval(1, words.length);

        		randomNumbersUsed.push(random);

        		var word = syllables[random - 1];

			if (word) {
        			var randomSyllable = randomIntFromInterval(1, word.length);

        			var firstLetterOfSyllable = word[randomSyllable - 1][0];

        			word[randomSyllable - 1] = firstLetterOfSyllable == firstLetterOfSyllable.toUpperCase() ? "BUTT" : "butt";
			}
		}

    		var newMessage = "";

    		syllables.forEach((s) => {
			if (s != null)
        			newMessage += s.join('') + ' ';
    		});

		client.say(channel, newMessage.trim());

		lastMessageButtified = moment();
	}
}

function onConnectedHandler (addr, port) {
	console.log(`* Connected to ${addr}:${port}`);
}