/*!
 * jQuery gzoom 0.1 (changes by 42cc)
 * 2009 Giovanni Battista Lenoci <gianiaz@gianiaz.net>
 * 
 * Based on minizoomPan plugin of Gian Carlo Mingati Version: 1.0 (18-JUNE-2009) http://www.gcmingati.net/wordpress/wp-content/lab/jquery/minizoompan/
 * Inspiration from jquery lightbox plugin http://leandrovieira.com/projects/jquery/lightbox/
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Requires:
 * jQuery v1.3.2 or later
 * jQuery ui.core.js v.1.7.1
 * jQuery ui.slider.js v.1.7.1
 * 
 * Changes by 42cc
 * 
 */
jQuery.fn.gzoom = function(settings) {
	settings = jQuery.extend({
  	sW: 10, // small image width
  	sH: 10, // small image height
  	lW: 20, // large image width
  	lH: 20, // large image height
  	step : 5,
  	frameColor: "#cecece",
  	frameWidth: 1,
  	re : /thumbs\//, 
  	replace : '',  
  	debug : false,
  	overlayBgColor : '#000',
    overlayOpacity:0.8,
    containerBorderSize: 10, 
    containerResizeSpeed : 400,
  	loaderContent: "loading...",  // plain text or an image tag eg.: "<img src='yoursite.com/spinner.gif' />"
  	lightbox: false,
  	zoom_slider_container: null,
  	zoom_change : null,
  	pan_start : null,
  	pan_finish : null,
  	zoomIcon : "" // icon url, if not empty shown on the right-top corner of the image
	}, settings);

	return this.each(function(){
	  
	  var swapped = false;
	  
	  var $div = jQuery(this).css({
	  	width: settings.sW, 
	  	height: settings.sH, 
	  	border: settings.frameWidth+"px solid "+settings.frameColor, 
	  	overflow:'hidden'}).addClass("minizoompan");
	  	
	  $div.wrap('<div class="gzoomwrap"></div>').css({ width:settings.sW });
	  var ig = $div.children().css({position: "relative"});
		
	  jQuery(window).bind("load", function() {
  		ig.width(settings.sW); 
  		ig.height(settings.sH); 
	  });
		
	  jQuery("<span class='loader'>"+settings.loaderContent+"<\/span>").insertBefore(ig);
	  if(settings.zoomIcon != '' && settings.lightbox) {
		  alert('lightbox not supported. changes by 42cc');
		  return;
	  } else if(settings.lightbox) {
		  alert('lightbox not supported. changes by 42cc');
		  return;
	  };
	
	  // external container for zoom
	  if (zoom_slider_container) {
			var $minus = jQuery('<div class="ui-icon ui-icon-minus gzoombutton">&nbsp;</div>');
			$(zoom_slider_container).append($minus);
			
			var $slider = jQuery('<div class="gzoomSlider"></div>');
			$(zoom_slider_container).append($slider);
			
			var $plus = jQuery('<div class="ui-icon ui-icon-plus gzoombutton">&nbsp;</div>');
			$(zoom_slider_container).append($plus);
	  };
		
	  $plus.click(function() {
		  valore = parseInt($slider.slider('value')) + settings.step;
		  $slider.slider('value', valore);
	  });
		
	  $minus.click(function() {
		  valore = parseInt($slider.slider('value')) - settings.step;
		  $slider.slider('value', valore);
	  });
	  
	  $slider.slider({
	  		value:0,
		    min: 0,
		    max: 100,
		    step: settings.step, 
            change: function(event, ui) {                
            	if(!swapped) {
	            	//var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
	              	//swapImage(ig, hiSrc);
	              	//$div.children("span.loader").fadeIn(250);
	                swapped = true;
	            };
	                    
                val = ui.value;
                
                newWidth = settings.sW+((settings.lW-settings.sW)*val)/100;
                newHeight = settings.sH+((settings.lH-settings.sH)*val)/100;
                
                ig_pos = ig.position();
                      
                deltaWidth = ig.width()-settings.sW;
                leftPos = Math.abs(ig_pos.left);
                leftFactor = leftPos/deltaWidth;
                newDeltaWidth = newWidth-settings.sW;
                newLeft = (leftFactor*newDeltaWidth)*-1;
                
                if (!newLeft) {
                	newLeft = 0;
                };
                      
                deltaHeight = ig.height()-settings.sH;
                topPos = Math.abs(ig_pos.top);
                topFactor = topPos/deltaHeight;
                newDeltaHeight = newHeight-settings.sH;
                newTop = (topFactor*newDeltaHeight)*-1;
                
                if (!newTop) {
                	newTop = 0;
                };
                
                if ($.browser.msie){
                	newWidth = Math.round(newWidth);
                	newHeight = Math.round(newHeight);
                	newLeft = Math.round(newLeft);
                	newTop = Math.round(newTop);          	
                };
                
                ig.css({ width: newWidth, height: newHeight, left: newLeft, top: newTop});
                
                if (settings.zoom_change) {
                	settings.zoom_change(newWidth / settings.sW, newHeight / settings.sH, newLeft, newTop);
                };
            }
      });
	  // $('<br style="clear:both" />').insertAfter($plus);
		
	  function swapImage(param, uri){
		param.load(function () {
			$div.children("span.loader").fadeOut(250);
		}).error(function (){
  			alert("Image does not exist or its SRC is not correct.");
		}).attr('src', uri);
	  };
	
	  var is_pan = false;
	  var mouseStartX = null;
	  var mouseStartY = null;
	  var mouseDropX = null;
	  var mouseDropY = null;
	  
	  // pan by mouse drug. 42cc
	  $div.mousedown(function(e){
		  if ($(e.target).attr('id') == ig.attr('id')) {
			  is_pan = true;
			  $(this).css('cursor','move');
		
			  mouseStartX = e.clientX - ig.offset().left;
			  mouseStartY = e.clientY - ig.offset().top;
		
			  if (settings.pan_start) {
				  settings.pan_start();                
			  };
			  return false;
		  }
		  return true;
	  });
	  
	  $div.mouseup(function(e){
		  if ($(e.target).attr('id') == ig.attr('id')) {
			is_pan = false;
			$(this).css('cursor','default');
		
			pos = ig.position();
		
			if (settings.pan_finish) {
				settings.pan_finish(pos.left, pos.top);                
			};
		}
	  });
	  
	  $div.mousemove(function(e){		 
		  if ($(e.target).attr('id') == ig.attr('id')) {
			  if (is_pan == true) {
				var leftPan =  e.clientX - mouseStartX;
				var topPan = e.clientY - mouseStartY;
				
				if ((leftPan * -1) > (ig.width() - $div.width())) {
					leftPan = (ig.width() - $div.width()) * -1 ;
				}
				
				if (leftPan > 0) {
					leftPan = 0;
				}
				
				if ((topPan * -1) > (ig.height() - $div.height())) {
					topPan = (ig.height() - $div.height()) * -1;
				}
				
				if (topPan > 0) {
					topPan = 0;
				}
				
				ig.css({left: leftPan, top: topPan});
				return false;
			  };
			  return true;
		  };
		  return true;
	  });
		
	  // mouse wheel is not supported. 42cc
	  if(typeof($.event.special.mousewheel) != 'undefined') {
		ig.mousewheel(function(event, delta) {
	        if (delta > 0) {
	        	valore = parseInt($slider.slider('value')) + settings.step;
	  		    $slider.slider('value', valore);
	  		} else if (delta < 0) {
	  		    valore = parseInt($slider.slider('value')) - settings.step;
		  	    $slider.slider('value', valore);
		  	}
	        return false; // prevent default
	    });
	  }
		
	function resize_fx(intImageWidth, intImageHeight) {
		
      if(settings.debug && typeof(console) != 'undefined') {
        console.log('resize_fx('+intImageWidth+','+intImageHeight+')');
      }

			if(intImageWidth > ($(window).width()*80/100)) {
  			imgWidth = $(window).width()*80/100;
  			intImageHeight = (imgWidth/intImageWidth)*intImageHeight;
  			$('#zoomedimage').css({'width': imgWidth+'px', 'height':intImageHeight});
	      if(settings.debug && typeof(console) != 'undefined') {
	        console.log('Img dimensions 80% horizontal:'+imgWidth+'x'+intImageHeight);
	      }
			} else {
  			imgWidth = intImageWidth;
			}
			
			if(intImageHeight > $(window).height()*80/100) {
			  imgHeight = $(window).height()*80/100;
			  imgWidth = (imgHeight/intImageHeight)*imgWidth;
  			$('#zoomedimage').css({'width': imgWidth+'px', 'height':imgHeight});
	      if(settings.debug && typeof(console) != 'undefined') {
	        console.log('Img dimensions 80% vertical:'+imgWidth+'x'+imgHeight);
	      }
			} else {
			  imgHeight = intImageHeight;
			}
			
      if(settings.debug && typeof(console) != 'undefined') {
        console.log('Img dimensions:'+imgWidth+'x'+imgHeight);
      }
			
			// Get current width and height
			var intCurrentWidth = $('#imagebox').width();
			var intCurrentHeight = $('#imagebox').height();
			// Get the width and height of the selected image plus the padding
			var intWidth = (imgWidth + (settings.containerBorderSize * 2)); // Plus the imageŽs width and the left and right padding value
			var intHeight = (imgHeight + (settings.containerBorderSize * 2)); // Plus the imageŽs height and the left and right padding value

    
			
			// Diferences
			var intDiffW = intCurrentWidth - intWidth;
			var intDiffH = intCurrentHeight - intHeight;
			// Perfomance the effect
			$('#imagebox').animate({ width: intWidth, height: intHeight },settings.containerResizeSpeed,function() { _show_image(); });
			if ( ( intDiffW == 0 ) && ( intDiffH == 0 ) ) {
				if ( $.browser.msie ) {
					___pause(250);
				} else {
					___pause(100);	
				}
			} 
			$('#lboximgdatacontainer').css({ width: imgWidth });
		};
		
		function drawIface() {
		
			$('body').append('<div id="gzoomoverlay"></div><div id="gzoomlbox"><div id="imagebox"><div id="gzoom-cont-img"><img id="zoomedimage"><div id="gzoomloading"><a href="#" id="gzoomloadinglink"><img src="images/loading.gif"></a></div></div></div><div id="gzoomlbox-con-imgdata"><div id="lboximgdatacontainer"><div id="gzoomlbox-image-details"><span id="gzoom-image-caption"></span></div></div></div></div>');	
		
			$('#gzoomoverlay').css({
				backgroundColor:	settings.overlayBgColor,
				opacity:			settings.overlayOpacity,
				width:				$(window).width(),
				height:				$(document).height()
			}).fadeIn();
			
			// Calculate top and left offset for the gzoomlbox div object and show it
			$('#gzoomlbox').css({
				top:	$(window).scrollTop() + ($(window).height() / 10),
				left:	$(window).scrollLeft()
			}).show();
			
			$('#gzoomoverlay,#gzoomlbox').click(function() {
				close();									
			});
			// If window was resized, calculate the new overlay dimensions
			$(window).resize(function() {
				$('#gzoomoverlay').css({
					width:		$(window).width(),
					height:		$(window).height()
				});
				// Calculate top and left offset for the jquery-lightbox div object and show it
				$('#gzoomlbox').css({
					top:	$(window).scrollTop() + ($(window).height() / 10),
					left:	$(window).scrollLeft()
				});
			});
			
			_set_image_to_view();
		}

		function _set_image_to_view() { // show the loading
			// Show the loading
			$('#gzoomlbox-con-imgdata').hide();
			$('#zoomedimage').hide();
			$('#gzoomloading').show();
			// Image preload process
			var objImagePreloader = new Image();
      if(!swapped) {
				var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
		  } else {
				var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
		  }
			objImagePreloader.onload = function() {
				$('#zoomedimage').attr('src',hiSrc);
				resize_fx(objImagePreloader.width,objImagePreloader.height);
			};
		  objImagePreloader.src = hiSrc;
		};

		function _show_image() {
 			$('#gzoomloading').hide();
			$('#zoomedimage').fadeIn(function() {
				_show_image_data();
			});
		};

		/**
		 * Show the image information
		 *
		 */
		function _show_image_data() {
			$('#lightbox-loading').hide();
      $('#gzoom-image-caption').html(ig.attr('title'));
			$('#gzoomlbox-con-imgdata').slideDown('fast');
		}
		
		function close() {
			$('#gzoomlbox').remove();
			$('#gzoomoverlay').fadeOut(function() { $('#gzoomoverlay').remove(); });
			$('embed, object, select').css({ 'visibility' : 'visible' });
		}

    function ___pause(ms) {
  		var date = new Date(); 
	  	curDate = null;
		  do { var curDate = new Date(); }
  		while ( curDate - date < ms);
	  };
		
	});	
	
};