'use strict';

/**
 * @module display
 * Provides features for displaying a full screen display of images for the digital module.
 **/

import path = require('path');
import spawn = require('spawn');

import { delay } from 'delay';
import { exec } from 'exec';

const { BrowserWindow } = require('electron');

let wv : any;
let cp : any;
let system : any = {};

let TMPDIR : any;

class WebView {
	private digitalWindow : any;
	public opened : boolean = false;
	public showing : boolean = false;
	constructor() {
		this.digitalWindow = new BrowserWindow({
			webPreferences: {
      			nodeIntegration: true,
      			allowRunningInsecureContent: false,
      			'unsafe-eval' : false
    		},
			width: 800, 
			height: 600,
			minWidth : 800,
			minHeight : 600//,
			//icon: path.join(__dirname, '../../assets/icons/icon.png')
		});
		this.digitalWindow.loadURL('file://' + __dirname + '../../../display.html');
		if (process.argv.indexOf('-d') !== -1 || process.argv.indexOf('--dev') !== -1) {
			this.digitalWindow.webContents.openDevTools();
		}
		this.digitalWindow.on('closed', () => {
			this.digitalWindow = null
		});
		this.digitalWindow.hide();
	}
	async open () {
		this.digitalWindow.show();
		this.showing = true;
		this.opened = true;
	}
	async start () {
		await this.open();
		await this.fullScreen();
		await delay(300);
	}
	async fullScreen () {
		//this.digitalWindow.setFullScreen(true);
		await this.digitalWindow.maximize();
	}
	setImage (src : string) {
		try {
			this.digitalWindow.webContents.send('display', { src });
		} catch (err) {
			console.error(err)
		}
	}
	setMeter () {
		this.digitalWindow.webContents.send('display', { meter : true });
	}
	setGrid () {
		this.digitalWindow.webContents.send('display', { grid : true });
	}
	hide () {
		if (this.digitalWindow) {
			this.digitalWindow.hide();
		}
		this.showing = false;
	}
	close () {
		if (this.digitalWindow) {
			this.digitalWindow.close();
			this.digitalWindow = null;
			
		}
		this.showing = false;
		this.opened = false;
		return true
	}
	async move () {

	}
}

function padded_frame (i : number) {
	let len = (i + '').length;
	let str = i + '';
	for (let x = 0; x < 5 - len; x++) {
		str = '0' + str;
	}
	return str;
}

async function display_eog (src :  string) {
	//timeout 3 eog --fullscreen ${src}
	cp = spawn('eog', ['--fullscreen', src]);
	await delay(200)
}


function display_wv (src : string) {
	wv.setImage(src);
}

async function hide () {
	if (system.platform !== 'nix') {
		//wv.hide();
	} else {
		if (cp) cp.kill();
	}
}

async function show (frame : number) {
	let padded : string = padded_frame(frame);
	let ext : string = 'tif';
	let tmppath : string;

	if (system.platform !== 'nix') {
		ext = 'png';
	}

	tmppath = path.join(TMPDIR, `export-${padded}.${ext}`);

	if (system.platform !== 'nix') {
		await open()
		display_wv(tmppath);
	} else {
		await display_eog(tmppath);
	}
}

async function open () {
	if (system.platform !== 'nix') {
		if (!wv || !wv.opened) {
        	wv = new WebView();
        	await wv.start()
    	}
	} else {
		//
	}
}

async function close () {
	if (system.platform !== 'nix') {
		wv.close()
	} else {
		if (cp) cp.kill();
	}
}

module.exports = function (sys : any) {
	system = sys;
	TMPDIR = path.join(system.tmp, 'mcopy_digital');
	
	return {
		open,
		show,
		hide,
		close
	}
}