/*
Background Stretcher jQuery Plugin
© 2009 ajaxBlender.com
For any questions please visit www.ajaxblender.com
or email us at support@ajaxblender.com

Version: 1.2
*/

;(function(jQuery){
/* Variables */
var container = null;
var allImgs = '', allLIs = '', containerStr = '';

var element = this;
var _bgStretcherPause = false;
var _bgStretcherTm = null;

jQuery.fn.bgStretcher = function(settings){
settings = jQuery.extend({}, jQuery.fn.bgStretcher.defaults, settings);
jQuery.fn.bgStretcher.settings = settings;

function _build(){
if(!settings.images.length){ return; }

_genHtml();

containerStr = '#' + settings.imageContainer;
container = jQuery(containerStr);
allImgs = '#' + settings.imageContainer + ' IMG';
allLIs = '#' + settings.imageContainer + ' LI';

jQuery(allLIs).hide();
jQuery(allLIs + ':first').show().addClass('bgs-current');

if(!container.length){ return; }
jQuery(window).resize(_resize);

if(settings.slideShow && jQuery(allImgs).length > 1){
_bgStretcherTm = setTimeout('jQuery.fn.bgStretcher.slideShow()', settings.nextSlideDelay);
}
_resize();
};

function _resize(){
var winW = jQuery(window).width();
var winH = jQuery(window).height();
var imgW = 0, imgH = 0;

// Update container's height
container.width(winW);
container.height(winH);

// Non-proportional resize
if(!settings.resizeProportionally){
imgW = winW;
imgH = winH;
} else {
var initW = settings.imageWidth, initH = settings.imageHeight;
var ratio = initH / initW;

imgW = winW;
imgH = winW * ratio;

if(imgH < winH){
imgH = winH;
imgW = imgH / ratio;
}
}

// Apply new size for images
if(!settings.resizeAnimate){
jQuery(allImgs).width(imgW).height(imgH);
} else {
jQuery(allImgs).animate({width: imgW, height: imgH}, 'normal');
}
};

function _genHtml(){
var code = '<div id="' + settings.imageContainer + '" class="bgstretcher"><ul>';
for(i = 0; i < settings.images.length; i++){
code += '<li><img src="' + settings.images[i] + '" alt="" /></li>';
}
code += '</ul></div>';
jQuery(code).appendTo('body');
};

/* Start bgStretcher */
_build();
};

jQuery.fn.bgStretcher.play = function(){
_bgStretcherPause = false;
jQuery.fn.bgStretcher._clearTimeout();
jQuery.fn.bgStretcher.slideShow();

};

jQuery.fn.bgStretcher._clearTimeout = function(){
if(_bgStretcherTm != null){
clearTimeout(_bgStretcherTm);
_bgStretcherTm = null;
}
}

jQuery.fn.bgStretcher.pause = function(){
_bgStretcherPause = true;
jQuery.fn.bgStretcher._clearTimeout();
};

jQuery.fn.bgStretcher.slideShow = function(){
var current = jQuery(containerStr + ' LI.bgs-current');
var next = current.next();
if(!next.length){
next = jQuery(containerStr + ' LI:first');
}

jQuery(containerStr + ' LI').removeClass('bgs-current');
next.addClass('bgs-current');

next.fadeIn( jQuery.fn.bgStretcher.settings.slideShowSpeed );
current.fadeOut( jQuery.fn.bgStretcher.settings.slideShowSpeed );

if(!_bgStretcherPause){
_bgStretcherTm = setTimeout('jQuery.fn.bgStretcher.slideShow()', jQuery.fn.bgStretcher.settings.nextSlideDelay);
}
};

/* Default Settings */
jQuery.fn.bgStretcher.defaults = {
imageContainer: 'bgstretcher',
resizeProportionally: true,
resizeAnimate: false,
images: [],
imageWidth: 1024,
imageHeight: 768,
nextSlideDelay: 3000,
slideShowSpeed: 'normal',
slideShow: true
};
jQuery.fn.bgStretcher.settings = {};
})(jQuery);