/**
 * 
 * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 * Copyright (c) 2011 Matteo Spinelli, http://cubiq.org/
 * Released under MIT license
 * http://cubiq.org/dropbox/mit-license.txt
 * 
 * Version 1.0.1 - Last updated: 2011.02.05
 * 
 * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 
 */

		
	var headID = document.getElementsByTagName("head")[0];         
	var cssNode = document.createElement('link');
	cssNode.type = 'text/css';
	cssNode.rel = 'stylesheet';
	cssNode.href = 'js/plugins/add2home/add2home.css?v2';
	cssNode.media = 'screen';
	headID.appendChild(cssNode);


	(function(){
		var nav = navigator,
			isIDevice = (/iphone|ipod|ipad/gi).test(nav.platform),
			isIPad = (/ipad/gi).test(nav.platform),
			isRetina = 'devicePixelRatio' in window && window.devicePixelRatio > 1,
			isSafari = nav.appVersion.match(/Safari/gi),
			hasHomescreen = 'standalone' in nav && isIDevice,
			isStandalone = hasHomescreen && nav.standalone,
			OSVersion = nav.appVersion.match(/OS \d+_\d+/g),
			platform = nav.platform.split(' ')[0],
			language = nav.language.replace('-', '_'),
			startY = startX = 0,
			expired = localStorage.getItem('_addToHome'),
			theInterval, closeTimeout, el, i, l,
			options = {
				animationIn: 'drop',		// drop || bubble || fade
				animationOut: 'fade',		// drop || bubble || fade
				startDelay: 2000,			// 2 seconds from page load before the balloon appears
				lifespan: 20000,			// 20 seconds before it is automatically destroyed
				bottomOffset: 14,			// Distance of the balloon from bottom
				expire: 0,					// Minutes to wait before showing the popup again (0 = always displayed)
				message: '',				// Customize your message or force a language ('' = automatic)
				touchIcon: false,			// Display the touch icon
				arrow: true,				// Display the balloon arrow
				iterations:100				// Internal/debug use
			},
			/* Message in various languages, en_us is the default if a language does not exist */
			intl = {
				ca_es: 'Per instal·lar aquesta aplicació al vostre %device premeu `%icon` i llavors `Afegir a pantalla d\'inici`',
				da_dk: 'Tilføj denne side til din %device: tryk på `%icon` og derefter `<strong>Tilføj til hjemmeskærm</strong>`.',
				de_de: 'Installieren Sie diese App auf Ihrem %device: `%icon` antippen und dann `<strong>Zum Home-Bildschirm</strong>`.',
				el_gr: 'Εγκαταστήσετε αυτήν την Εφαρμογή στήν συσκευή σας %device: `%icon` μετά πατάτε `<strong>Προσθήκη σε Αφετηρία</strong>`.',
				en_us: 'Install this web app on your %device: tap `%icon` and then `<strong>Add to Home Screen</strong>`.',
				es_es: 'Para instalar esta app en su %device, pulse `%icon` y seleccione `<strong>Añadir a pantalla de inicio</strong>`.',
				fr_fr: 'Ajoutez cette application sur votre %device en cliquant sur `%icon`, puis `<strong>Ajouter à l\'écran d\'accueil</strong>`.',
				he_il: '<span dir="rtl">התקן אפליקציה זו על ה-%device שלך: הקש `%icon` ואז `<strong>הוסף למסך הבית</strong>`.</span>',
				it_it: 'Installa questa applicazione sul tuo %device: premi su `%icon` e poi `<strong>Aggiungi a Home</strong>`.',
				ja_jp: 'このウェブアプリをあなたの%deviceにインストールするには`%icon`をタップして`<strong>ホーム画面に追加</strong>`を選んでください。',
				ko_kr: '%device에 웹앱을 설치하려면 %icon을 터치 후 "홈화면에 추가"를 선택하세요',
				nl_nl: 'Installeer deze webapp op uw %device: tik `%icon` en dan `<strong>Zet in beginscherm</strong>`.',
				pt_br: 'Instale este web app em seu %device: aperte `%icon` e selecione `<strong>Adicionar à Tela Inicio</strong>`.',
				pt_pt: 'Para instalar esta aplicação no seu %device, prima o `%icon` e depois o `<strong>Adicionar ao ecrã principal</strong>`.',
				sv_se: 'Lägg till denna webbapplikation på din %device: tryck på `%icon` och därefter `<strong>Lägg till på hemskärmen</strong>`.',
			};

		OSVersion = OSVersion ? OSVersion[0].replace(/[^\d_]/g,'').replace('_','.')*1 : 0;
		expired = expired == 'null' ? 0 : expired*1;

		// Merge options
		if (window.addToHomeConfig) {
			for (i in window.addToHomeConfig) {
				options[i] = window.addToHomeConfig[i];
			}
		}

		// Is it expired?
		if (!options.expire || expired < new Date().getTime()) {
			expired = 0;
		}

		/* Bootstrap */
		if (hasHomescreen && !expired && !isStandalone && isSafari) {
			document.addEventListener('DOMContentLoaded', ready, false);
			window.addEventListener('load', loaded, false);
		}


		/* on DOM ready */
		function ready () {
			document.removeEventListener('DOMContentLoaded', ready, false);

			var div = document.createElement('div'),
				close,
				link = options.touchIcon ? document.querySelectorAll('head link[rel=apple-touch-icon],head link[rel=apple-touch-icon-precomposed]') : [],
				sizes, touchIcon = '';

			div.id = 'addToHomeScreen';
			div.style.cssText += 'position:absolute;-webkit-transition-property:-webkit-transform,opacity;-webkit-transition-duration:0;-webkit-transform:translate3d(0,0,0);';
			div.style.left = '-9999px';		// Hide from view at startup

			// Localize message
			if (options.message in intl) {		// You may force a language despite the user's locale
				language = options.message;
				options.message = '';
			}
			if (options.message == '') {		// We look for a suitable language (defaulted to en_us)
				options.message = language in intl ? intl[language] : intl['en_us'];
			}

			// Search for the apple-touch-icon
			if (link.length) {
				for (i=0, l=link.length; i<l; i++) {
					sizes = link[i].getAttribute('sizes');

					if (sizes) {
						if (isRetina && sizes == '114x114') { 
							touchIcon = link[i].href;
							break;
						}
					} else {
						touchIcon = link[i].href;
					}
				}

				touchIcon = '<span style="background-image:url(' + touchIcon + ')" class="touchIcon"></span>';
			}

			div.className = (isIPad ? 'ipad' : 'iphone') + (touchIcon ? ' wide' : '');
			div.innerHTML = touchIcon + options.message.replace('%device', platform).replace('%icon', OSVersion >= 4.2 ? '<span class="share"></span>' : '<span class="plus">+</span>') + (options.arrow ? '<span class="arrow"></span>' : '') + '<span class="close">×</span>';

			document.body.appendChild(div);
			el = div;

			// Add the close action
			close = el.querySelector('.close');
			if (close) close.addEventListener('click', addToHomeClose, false);

			// Add expire date to the popup
			if (options.expire) localStorage.setItem('_addToHome', new Date().getTime() + options.expire*60*1000);
		}


		/* on window load */
		function loaded () {
			window.removeEventListener('load', loaded, false);

			setTimeout(function () {
				var duration;
				
				startY = isIPad ? window.scrollY : window.innerHeight + window.scrollY;
				startX = isIPad ? window.scrollX : Math.round((window.innerWidth - el.offsetWidth)/2) + window.scrollX;

				el.style.top = isIPad ? startY + options.bottomOffset + 'px' : startY - el.offsetHeight - options.bottomOffset + 'px';
				el.style.left = isIPad ? startX + 208 - Math.round(el.offsetWidth/2) + 'px' : startX + 'px';

				switch (options.animationIn) {
					case 'drop':
						if (isIPad) {
							duration = '0.6s';
							el.style.webkitTransform = 'translate3d(0,' + -(window.scrollY + options.bottomOffset + el.offsetHeight) + 'px,0)';
						} else {
							duration = '0.9s';
							el.style.webkitTransform = 'translate3d(0,' + -(startY + options.bottomOffset) + 'px,0)';
						}
						break;
					case 'bubble':
						if (isIPad) {
							duration = '0.6s';
							el.style.opacity = '0'
							el.style.webkitTransform = 'translate3d(0,' + (startY + 50) + 'px,0)';
						} else {
							duration = '0.6s';
							el.style.webkitTransform = 'translate3d(0,' + (el.offsetHeight + options.bottomOffset + 50) + 'px,0)';
						}
						break;
					default:
						duration = '1s';
						el.style.opacity = '0';
				}

				setTimeout(function () {
					el.style.webkitTransitionDuration = duration;
					el.style.opacity = '1';
					el.style.webkitTransform = 'translate3d(0,0,0)';
					el.addEventListener('webkitTransitionEnd', transitionEnd, false);
				}, 0);

				closeTimeout = setTimeout(addToHomeClose, options.lifespan);
			}, options.startDelay);
		}

		function transitionEnd () {
			el.removeEventListener('webkitTransitionEnd', transitionEnd, false);
			el.style.webkitTransitionProperty = '-webkit-transform';
			el.style.webkitTransitionDuration = '0.2s';

			if (closeTimeout) {		// Standard loop
				clearInterval(theInterval);
				theInterval = setInterval(setPosition, options.iterations);
			} else {				// We are closing
				el.parentNode.removeChild(el);
			}
		}

		function setPosition () {
			var matrix = new WebKitCSSMatrix(window.getComputedStyle(el, null).webkitTransform),
				posY = isIPad ? window.scrollY - startY : window.scrollY + window.innerHeight - startY,
				posX = isIPad ? window.scrollX - startX : window.scrollX + Math.round((window.innerWidth - el.offsetWidth)/2) - startX;

			if (posY == matrix.m42 && posX == matrix.m41) return;

			clearInterval(theInterval);
			el.removeEventListener('webkitTransitionEnd', transitionEnd, false);
//			el.style.webkitTransitionDuration = '0';

			setTimeout(function () {
				el.addEventListener('webkitTransitionEnd', transitionEnd, false);
//				el.style.webkitTransitionDuration = '0.2s';
				el.style.webkitTransform = 'translate3d(' + posX + 'px,' + posY + 'px,0)';
			}, 0);
		}

		function addToHomeClose () {
			clearInterval(theInterval);
			clearTimeout(closeTimeout);
			closeTimeout = null;
			el.removeEventListener('webkitTransitionEnd', transitionEnd, false);
			
			var posY = isIPad ? window.scrollY - startY : window.scrollY + window.innerHeight - startY,
				posX = isIPad ? window.scrollX - startX : window.scrollX + Math.round((window.innerWidth - el.offsetWidth)/2) - startX,
				opacity = '1',
				duration = '0',
				close = el.querySelector('.close');

			if (close) close.removeEventListener('click', addToHomeClose, false);

			el.style.webkitTransitionProperty = '-webkit-transform,opacity';

			switch (options.animationOut) {
				case 'drop':
					if (isIPad) {
						duration = '0.4s';
						opacity = '0';
						posY = posY + 50;
					} else {
						duration = '0.6s';
						posY = posY + el.offsetHeight + options.bottomOffset + 50;
					}
					break;
				case 'bubble':
					if (isIPad) {
						duration = '0.8s';
						posY = posY - el.offsetHeight - options.bottomOffset - 50;
					} else {
						duration = '0.4s';
						opacity = '0';
						posY = posY - 50;
					}
					break;
				default:
					duration = '0.8s';
					opacity = '0';
			}

			el.addEventListener('webkitTransitionEnd', transitionEnd, false);
			el.style.opacity = opacity;
			el.style.webkitTransitionDuration = duration;
			el.style.webkitTransform = 'translate3d(' + posX + 'px,' + posY + 'px,0)';
		}

		/* Public function */
		window.addToHomeClose = addToHomeClose;
		})();