/* $Id: lightbox.js,v 1.15 2010-05-21 17:38:36 radovan Exp $ */
// !!! Define variable 'lightboxLang' [en,de,cs,sk]
// LightBox version 2.0

// ----- Configuration -----
var lightboxConfig = {
	loadingImage: '../lightbox/loading.gif', // preloader
	closeKey: 'x', // 
	closeText: {
		cs: 'kliknutím okno zavřete (stiskněte X)',
		sk: 'kliknutím okno zatvorite (stlačtě X)',
		en: 'click to close the window (press X)',
		de: 'Klicken Sie auf um das Fenster zu schließen (X drücken)'
	},
	closeShow: true, // close button in details
	closeEndShow: true, // close click to image is not prev/next button
	prevKey: 'p',
	prevText: {
		cs: 'předchozí (klikněte nebo stiskněte P)',
		sk: 'predchozí (kliknitě alebo stlačtě P)',
		en: 'previous (click or press P)',
		de: 'Zurück (klicken oder drücken P)'
	},
	nextKey: 'n',
	nextText: {
		cs: 'následující (klikněte nebo stiskněte N)',
		sk: 'následujúci (klikněte alebo stlačtě N)',
		en: 'next (click or press N)',
		de: 'Weiter (klicken oder drücken N)'
	},
	playShow: true, // play/stop button in details
	playDelay: 5000, // time interval to playback
	playKey: 'a',
	playText: {
		cs: 'play (klikněte nebo stiskněte A)',
		sk: 'play (kliknitě alebo stlačtě A)',
		en: 'play (click or press A)',
		de: 'Play (klicken oder drücken A)'
	},
	stopKey: 's',
	stopText: {
		cs: 'stop (klikněte nebo stiskněte S)',
		sk: 'stop (kliknitě alebo stlačtě S)',
		en: 'stop (click or press S)',
		de: 'Stop (klicken oder drücken S)'
	},
	imagesText: { // note 'image 5/14'
		cs: 'obrázek',
		sk: 'obrázok',
		en: 'picture',
		de: 'Bild'
	},
	navigationShow: true, // show navigation 'image 5/14'
	dimensionShow: false, // show dimension after navigation
	detailsShow: true // show note image and navigation
};


// ----- Initialization -----
if(!lightboxLang) { var lightboxLang = 'en'; }
switch(lightboxLang){
	case 'de': case 'cs': case 'sk': break;
	default: lightboxLang = 'en';
}

var lightboxAnchors = new Array(); // array of links
var lightboxCurrent = 0; // current item
var lightboxGroup = ''; // group item
var lightboxPlayback = false; // auto plaiback images


// ----- Get page scroll - returns array with 0-x,1-y page scroll values -----
function getPageScroll(){
	var yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop) {
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {
		yScroll = document.body.scrollTop;
	}
	return new Array('',yScroll);
}


// ----- Get page size - returns array with page 0-width, 1-height and window 2-width, 3-height -----
function getPageSize(){
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight) {
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else {
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	var windowWidth, windowHeight;
	if (self.innerHeight) {
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) {
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}
	var pageHeight = yScroll < windowHeight ? windowHeight : yScroll;
	var pageWidth = xScroll<windowWidth ? windowWidth : xScroll;
	return new Array(pageWidth, pageHeight, windowWidth, windowHeight);
}


// ----- Pauses code execution for specified time -----
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}


// ----- Gets keycode -----
function getKey(e){
	var keycode;
	if (e == null) {
		keycode = event.keyCode;
	} else {
		keycode = e.which;
	}
	var key = String.fromCharCode(keycode).toLowerCase();
	if(key==lightboxConfig.closeKey){ hideLightbox(); }
	if(key==lightboxConfig.prevKey){ prevLightbox(); }
	if(key==lightboxConfig.nextKey){ nextLightbox(); }
	if(key==lightboxConfig.playKey){ playLightbox(); }
	if(key==lightboxConfig.stopKey){ stopLightbox(); }
}


// ----- Listen key -----
function listenKey () { document.onkeypress = getKey; }


// ----- Show lightbox centers displays, preloads images -----
function showLightbox(objLink) {
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');
	var objPrev = document.getElementById('prevLink');
	var objNext = document.getElementById('nextLink');
	var objClose = document.getElementById('closeLightbox');

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	lightboxCurrent = parseInt(objLink.getAttribute('name'));
	lightboxGroup = objLink.getAttribute('group');

	objPrev.style.display = indexGroupLightbox()<=0 ? 'none' : 'block';
	objNext.style.display = countGroupLightbox()-indexGroupLightbox()-1<=0 ? 'none' : 'block';

	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	var imgPreload = new Image();
	imgPreload.onload = function() {
		objImage.src = objLink.href;
		var imgwidth = imgPreload.width;
		var imgheight = imgPreload.height;
		var koef = 1.0;
		if(imgwidth>arrayPageSize[0]-35) { koef = (arrayPageSize[0]-35)/imgwidth; }
		if((imgheight*koef)>arrayPageSize[3]-70) { koef = (arrayPageSize[3]-70)/imgheight; }
		var imgwidth = parseInt(imgwidth*koef);
		var imgheight = parseInt(imgheight*koef);
		objImage.width = imgwidth;
		objImage.height = imgheight;
		var lightboxTop = arrayPageScroll[1]+((arrayPageSize[3]-60-imgheight)/2);
		var lightboxLeft = ((arrayPageSize[0]-35-imgwidth)/2);
		objLightbox.style.top = (lightboxTop<0) ? "0px" : lightboxTop+"px";
		objLightbox.style.left = (lightboxLeft<0) ? "0px" : lightboxLeft+"px";
		objPrev.style.width = imgwidth/2;
		objPrev.style.height = imgheight;
		objNext.style.width = imgwidth/2;
		objNext.style.height = imgheight;
		objClose.style.width = imgwidth;
		objClose.style.height = imgheight;
		objLightboxDetails.style.width = imgwidth+'px';
		objCaption.style.display = 'block';
		var text = '';
		if(objLink.getAttribute('title')){
			text = '<b>'+objLink.getAttribute('title')+'</b>';
		}
		if(lightboxConfig.navigationShow) {
			text = text + '<br />'+lightboxConfig.imagesText[lightboxLang]+' '+(indexGroupLightbox()+1)+'/'+countGroupLightbox();
			if(lightboxConfig.dimensionShow) {
				text = text + ' ['+imgwidth+'x'+imgheight+' px]';
			}
		}
		objCaption.innerHTML = text;
		if(navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		}
		if(objLoadingImage){ objLoadingImage.style.display = 'none'; }
		objLightbox.style.display = 'block';
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		listenKey();
		return false;
	}

	objLightbox.style.display = 'none';
	imgPreload.src = objLink.href;

}


// ----- Hide lightbox -----
function hideLightbox() {
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	document.onkeypress = '';
	stopLightbox();
}


// ----- Next image lightbox -----
function nextLightbox() {
	if(countGroupLightbox()-indexGroupLightbox()-1>=1) {
		showLightbox(lightboxAnchors[lightboxCurrent+1]);
	} else if(lightboxPlayback) {
		stopLightbox();
		hideLightbox();
	}
}


// ----- Previous image lightbox -----
function prevLightbox() {
	if(indexGroupLightbox()-1>=0) {
		showLightbox(lightboxAnchors[lightboxCurrent-1]);
	}
	stopLightbox();
}


// ----- Play lightbox -----
function playLightbox() {
	var objPlay = document.getElementById('playLink');
	objPlay.className = 'stop';
	objPlay.setAttribute('title',lightboxConfig.stopText[lightboxLang]);
	lightboxPlayback = setInterval(nextLightbox, lightboxConfig.playDelay);
}


// ----- Stop lightbox -----
function stopLightbox() {
	var objPlay = document.getElementById('playLink');
	if(lightboxPlayback) {
		objPlay.className = 'play';
		objPlay.setAttribute('title',lightboxConfig.playText[lightboxLang]);
		clearInterval(lightboxPlayback);
		lightboxPlayback = false;
	}
}


// ----- Actual index in group anchors -----
function indexGroupLightbox() {
	var id=0;
	for(var i=0; i<lightboxAnchors.length; i++){
		if(lightboxGroup==lightboxAnchors[i].getAttribute('group')) {
			id = lightboxCurrent-i;
			break;
		}
	}
	return id;
}


// ----- Count items in group anchors -----
function countGroupLightbox() {
	var cnt=0;
	for(var i=0; i<lightboxAnchors.length; i++){
		if(lightboxGroup==lightboxAnchors[i].getAttribute('group')) {
			cnt++;
		}
	}
	return cnt;
}


// ----- Initialize lightbox -----
function initLightbox() {
	if (!document.getElementsByTagName) { return; }
	var anchors = document.getElementsByTagName("a");

	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];
		var rel = anchor.getAttribute("rel");
		if (rel && anchor.getAttribute("href") && (rel.indexOf("lightbox") != -1)) {
			lightboxAnchors.push(anchor);
			group = rel.match(/lightbox\[([^\]]+)\]$/);
			anchor.setAttribute('name',lightboxAnchors.length-1);
			anchor.setAttribute('group', group ? group[1] : '');
			anchor.onclick = function () { showLightbox(this); return false; }
		}
	}

	var objBody = document.getElementsByTagName("body").item(0);
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () { hideLightbox(); return false; }
	objBody.insertBefore(objOverlay, objBody.firstChild);

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	var imgPreloader = new Image();
	imgPreloader.onload=function(){
		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () { hideLightbox(); return false; }
		objOverlay.appendChild(objLoadingImageLink);
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = lightboxConfig.loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImageLink.appendChild(objLoadingImage);
		imgPreloader.onload=function(){ };
		return false;
	}
	imgPreloader.src = lightboxConfig.loadingImage;

	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);

	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLightbox.appendChild(objImage);

	var lightboxClose = document.createElement("a");
	lightboxClose.setAttribute('id','closeLightbox');
	lightboxClose.setAttribute('href','#');
	lightboxClose.setAttribute('title',lightboxConfig.closeText[lightboxLang]);
	lightboxClose.onclick = function () { hideLightbox(); return false; }
	objLightbox.appendChild(lightboxClose);
	if(!lightboxConfig.closeEndShow) {
		lightboxClose.style.display = 'none';
	}

	var objPrev = document.createElement("a");
	objPrev.setAttribute('id','prevLink');
	objPrev.setAttribute('href','#');
	objPrev.setAttribute('title',lightboxConfig.prevText[lightboxLang]);
	objPrev.onclick = function () { prevLightbox(); return false; }
	objLightbox.appendChild(objPrev);

	var objNext = document.createElement("a");
	objNext.setAttribute('id','nextLink');
	objNext.setAttribute('href','#');
	objNext.setAttribute('title',lightboxConfig.nextText[lightboxLang]);
	objNext.onclick = function () { nextLightbox(); return false; }
	objLightbox.appendChild(objNext);

	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);

	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objLightboxDetails.appendChild(objCaption);

	if(lightboxConfig.detailsShow) {
		if(lightboxConfig.playShow && lightboxAnchors.length>1) {
			var objPlay = document.createElement("a");
			objPlay.setAttribute('id','playLink');
			objPlay.className = 'play';
			objPlay.setAttribute('href','#');
			objPlay.setAttribute('title',lightboxConfig.playText[lightboxLang]);
			objPlay.onclick = function () { if(lightboxPlayback) { stopLightbox(); } else { playLightbox(); } return false; }
			objLightbox.appendChild(objPlay);
		}
		if(lightboxConfig.closeShow) {
			var objClose = document.createElement("a");
			objClose.setAttribute('id','closeLink');
			objClose.setAttribute('href','#');
			objClose.setAttribute('title',lightboxConfig.closeText[lightboxLang]);
			objClose.onclick = function () { hideLightbox(); return false; }
			objLightbox.appendChild(objClose);
		}
	} else {
		objLightboxDetails.style.display = 'none';
	}
}


// ----- Adds event to window.onload -----
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
			oldonload();
			func();
		}
	}
}

var domLoaded = function (callback) {
    /* Mozilla, Chrome, Opera */
    if (document.addEventListener) {
        document.addEventListener('DOMContentLoaded', callback, false);
    }
    /* Safari, iCab, Konqueror */
    else if (/KHTML|WebKit|iCab/i.test(navigator.userAgent)) {
        var DOMLoadTimer = setInterval(function () {
            if (/loaded|complete/i.test(document.readyState)) {
                callback();
                clearInterval(DOMLoadTimer);
            }
        }, 10);
    }else{
    	/* Other web browsers */
    	addLoadEvent(callback);
    }
};

// ----- Start lightbox -----
if(window.init_light_box_immediately){
	initLightbox();
}else{
	domLoaded(initLightbox);
}