// PACKAGES
const WebSocketClient = require('websocket').client
const express = require('express')
require('dotenv').config()


// UTILS
const getReward				= require('./utils/getReward')
const getUserAccessToken	= require('./utils/getUserAccessToken')
const getUserID				= require('./utils/getUserID')
const getUserName			= require('./utils/getUserName')
const oauthGen				= require('./utils/oauthGen')
const parseMessage			= require('./utils/parseMessage')
const rewardRedemption		= require('./utils/rewardRedemption')
const subscribeToEvents		= require('./utils/subscribeToEvents')
const writeEnv				= require('./utils/writeEnv')


// VARIABLES
let client_id = process.env.TWITCH_APP_ID
let client_secret = process.env.TWITCH_APP_SECRET

let user_access_token = process.env.TWITCH_USER_ACCESS_TOKEN
let user_name = process.env.TWITCH_USER_USERNAME

let channel_access_token = process.env.TWITCH_CHANNEL_ACCESS_TOKEN
let channel_name = process.env.TWITCH_CHANNEL_USERNAME

const user_scope = ['chat:read', 'chat:edit', 'channel:moderate']
const channel_scope = ['channel:manage:redemptions']

const redirect_uri = 'https://angels-dev.fr/twitch/oauth/login/'
const chatBeginMsg = `PRIVMSG #${channel_name}`


// EXPRESS
const port = 3000
const app = express()
app.use(express.json())
app.use(express.static('panel'))

app.get('/twitch/oauth/:type', async (req, res) => {
	let type = req.params.type
	let url = await oauthGen(client_id, redirect_uri + type, type === 'user' ? user_scope : type === 'channel' ? channel_scope : [])

	return res.redirect(url)
})

app.get('/twitch/oauth/login/:type', async (req, res) => {
	console.log(req.query)
	let type = req.params.type

	if (type === 'user') {
		user_access_token = await getUserAccessToken(req.query.code, client_id, client_secret, redirect_uri + type)
		writeEnv('TWITCH_USER_ACCESS_TOKEN', user_access_token)

		user_name = await getUserName(client_id, user_access_token)
		writeEnv('TWITCH_USER_USERNAME', user_name)

		clientChatBot.connect('wss://irc-ws.chat.twitch.tv:443')
	}
	else if (type === 'channel') {
		channel_access_token = await getUserAccessToken(req.query.code, client_id, client_secret, redirect_uri + type)
		writeEnv('TWITCH_CHANNEL_ACCESS_TOKEN', channel_access_token)

		channel_name = await getUserName(client_id, channel_access_token)
		writeEnv('TWITCH_CHANNEL_USERNAME', channel_name)
		
		clientEventSub.connect('wss://eventsub.wss.twitch.tv/ws')
	}
	return res.send('Login successful !')
})

app.listen(port, () => { console.log(`Listening at ${redirect_uri}`) })


// CHATBOT
const clientChatBot = new WebSocketClient()
let connectionChatBot

clientChatBot.on('connect', async connection => {
	console.log('Twitch ChatBot WebSocket Connected !')
	connectionChatBot = connection

	// Authenticate to Twitch IRC and join channel
	connection.sendUTF('CAP REQ :twitch.tv/commands twitch.tv/membership twitch.tv/tags')
	connection.sendUTF(`PASS oauth:${user_access_token}`)
	connection.sendUTF(`NICK ${user_name}`)
	connection.sendUTF(`JOIN #${channel_name}`)
	connection.sendUTF(`PRIVMSG #${channel_name} :Salut tout le monde !`)
	
	connection.on('message', async message => {
		if (message.type === 'utf8') {
			try {
				let data = parseMessage(message.utf8Data)
	
				// Handle incoming messages
				if (data.command.command === 'PRIVMSG') {	
					let message = data.parameters.split('\r\n')[0]
					console.log(`${data.source.nick}: ${message}`)

					if (message.includes('@Bot_Laytho')) {
						connection.sendUTF(`@reply-parent-msg-id=${data.tags.id} ${chatBeginMsg} :Kestuveu @${data.tags['display-name']} ?`)
						connection.sendUTF(`${chatBeginMsg} :/timeout ${data.tags['display-name']} 60 T'as pas à me parler comme ça !`)
					}
					else if (message === '!ping') {
						connection.sendUTF(`@reply-parent-msg-id=${data.tags.id} ${chatBeginMsg} :Pong !`)
					}
				} else if (data.command.command === 'NOTICE') {
					if (data.parameters.includes('Login authentication failed')) {
						console.log('Erreur de connexion ChatBot, veuillez vous reconnecter !\nhttps://angels-dev.fr/twitch/oauth/user')
					}
				}
			} catch (error) { } // catch (error) { console.error(error) }
		} })
	.on('error', error => { console.error(error) })
	.on('close', () => { console.log('Twitch ChatBot Connection Closed !') })
}).on('connectFailed', error => { console.error(error) })

clientChatBot.connect('wss://irc-ws.chat.twitch.tv:443')


// EVENTSUB
const clientEventSub = new WebSocketClient().on('connect', async connection => {
	console.log('Twitch EventSub WebSocket Connected !')

	connection.on('message', async message => {
		if (message.type === 'utf8') {
			try {
				let data = JSON.parse(message.utf8Data)
				
				// Check when Twitch asks to login
				if (data.metadata.message_type === 'session_welcome') {

					// Get broadcaster user id and reward id
					let broadcaster_user_id = await getUserID(client_id, channel_access_token, channel_name)
					let reward_id = await getReward(client_id, channel_access_token, broadcaster_user_id)
					let topics = {
						'channel.channel_points_custom_reward_redemption.add': { version: '1', condition: { broadcaster_user_id, reward_id } },
						'stream.online': { version: '1', condition: { broadcaster_user_id } }
					}
	
					// Subscribe to all events required
					for (let type in topics) {
						console.log(`Creating ${type}...`)
						let { version, condition } = topics[type]

						let status = await subscribeToEvents(channel_access_token, data.payload.session.id, client_id, type, version, condition)
						if (!status) return console.error(`Failed to create ${type}`)

						else if (status.error) {
							console.error(status)
							console.log('Erreur de connexion EventSub, veuillez vous reconnecter !\nhttps://angels-dev.fr/twitch/oauth/channel')
							return connection.sendUTF(`${chatBeginMsg} :@${channel_name} Erreur de connexion EventSub, veuillez vous reconnecter !\nhttps://angels-dev.fr/twitch/oauth/channel`)
						} else console.log(`Successfully created ${type}`)
					}
				}

				// Handle notification messages for reward redemption
				else if (data.metadata.message_type === 'notification') {
					let{ subscription, event } = data.payload

					//if (subscription.type === 'channel.channel_points_custom_reward_redemption.add' && event.reward.id === reward_id) {
					if (subscription.type === 'channel.channel_points_custom_reward_redemption.add') {
						let { user_id, user_name } = event
						console.log(`User ${user_name} claimed reward ${event.reward.title} !`)
						rewardRedemption(user_id, user_name)
					}
					else if (subscription.type === 'stream.online' && event.broadcaster_user_login === channel_name) {
						console.log(`Stream from ${event.broadcaster_user_name} is now online, connecting to chat...`)
						clientChatBot.connect('wss://irc-ws.chat.twitch.tv:443')
					}
				}

				// Don't log ping/pong messages
				else if (data.metadata.message_type === 'session_keepalive') return

				// Log unknown messages
				else console.log(data)
			} catch (error) { console.error(error) }
		} })
	.on('error', error => { console.error(error) })
	.on('close', () => { console.log('Twitch EventSub Connection Closed !') })
}).on('connectFailed', error => { console.error(error) })

clientEventSub.connect('wss://eventsub.wss.twitch.tv/ws')