const fs = require('fs')
const sharp = require('sharp')
const inky = require('@aeroniemi/inky')
const frame = new inky.Impression73()
const folder = '../album/'
var filelist = false

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)
		setTimeout(displayAlbum, 900000)
	}
}

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

loadImgs()