const rclone = require('rclone.js')
const schedule = require('node-schedule')
const fs = require('fs')
const sharp = require('sharp')
const inky = require('@aeroniemi/inky')
const mqtt = require('mqtt')

const frame = new inky.Impression73()
const folder = './gallery/'

// Connect to MQTT
const mqttclient = mqtt.connect('mqtt://mqtt.srv.jnf.me', {
	clientId: 'pictureframe_' + Math.random().toString(16).substr(2, 8),
	username: 'pictureframe',
	password: 'pictureframe'
})

var ticker = false
var filelist = false

function downloadImgs() {
	console.log('Starting download from Google Photos...')
	const sync = rclone.sync('gphotos:album/Family Room Photo Frame', folder)

	sync.stdout.on('data', function(data) {
		console.log(data.toString())
	})

	sync.on('exit', function() {
		console.log('Synchronized from Google Photos. Loading images...')
		loadImgs()
	})
}

function loadImgs() {
	fs.readdir(folder, (err, files) => {
		if (err || files.length == 0) {
			console.log('No images found. Exiting.')
			process.exit(1)
		} else {
			console.log(files.length + ' images found. Starting album display...')
			filelist = files
			displayAlbum()
		}
	})
}

function displayAlbum() {
	if (filelist.length == 0) loadImgs()
	else {
		imgref = Math.floor(Math.random() * filelist.length)
		imgfile = filelist.splice(imgref, 1)[0]
		console.log('Randomly displaying image ' + (imgref + 1) + ' of ' + (filelist.length + 1) + ' remaining: ' + imgfile)
		displayImage(imgfile)
		ticker = setTimeout(displayAlbum, 1800000)
	}
}

function displayImage(filename) {
	sharp(folder + filename)
	  .resize(800,480)
	  .toFile('output.png', (err, info) => {
		frame.display_png('output.png')
		frame.show()
	})
}

function displayWifi() {
	console.log('Displaying wifi connection information for 10 minutes')
	clearTimeout(ticker)
	frame.display_png('img/wifi.png')
	frame.show()
	ticker = setTimeout(displayAlbum, 600000)
}

// Subscribe to our MQTT topic...
mqttclient.on('connect', () => {
	mqttclient.subscribe('pictureframe/command')
})

// Listen for MQTT command messages
mqttclient.on('message', (topic, message) => {
	message = message.toString()
	console.log('MQTT command received: ' + message)

	if (message == 'wifi') displayWifi()
	if (message == 'reset') {
		clearTimeout(ticker)
		downloadImgs()
	}
})

// We start by downloading images. Other functions will be called if this is successful...
downloadImgs()

// Define a cron-job to restart everything at 1:30am (including a refresh of the album)....
schedule.scheduleJob('0 30 1 * * *', function() {
	clearTimeout(ticker)
	console.log('Resetting...')
	downloadImgs()
})