// ZOOMFT v1.1
// (c) Pawel Gruszecki, grusza@gmail.com
// The following script can be used to allow visitors to increase or decrease the size of text on your page. This can be useful for visitors who have trouble reading smaller text and allows them to increase it to something they can view more easily.
// License: http://creativecommons.org/licenses/LGPL/2.1/
// NOTE: script needs jQuery cookie plugin for working, http://plugins.jquery.com/project/Cookie

// useful for debuging
//function trace(s) { try { console.log(s) } catch (e) { alert(s) }};

var fontsize = {
  maxZoomOut: -3,
  maxZoomIn: 3,
  minFontSize: 9, // px
  maxFontSize: 20, // px
  reg: /([\d.]+)([^\d\r\n.]+)/,
  tags: new Array("span", "strong", "li", "a", "td", "p", "div"), // html tags sensitive for font resizing
  actualZoom: !isNaN( parseInt( $.cookie('FONT-ZOOM') ) ) ? parseInt( $.cookie('FONT-ZOOM') ) : 0, // get font zoom from cookie
  
  getSizeInPX: function(o) { // parse old size and returns font size in px
  	
  	switch (o) {
  	  case 'xx-small': o = '9px'; break;
  	  case 'x-small': o = '10px'; break;
  	  case 'small': o = '13px'; break;
  	  case 'medium': o = '16px'; break;
  	  case 'large': o = '18px'; break;
  	  case 'x-large': o = '24px'; break;
  	  case 'xx-large': o = '32px'; break;
  	}
  	return o;
  },
  increment: function (n) { // increment font size
      
    if (this.actualZoom < this.maxZoomIn) {
      $.cookie('FONT-ZOOM', ++this.actualZoom); // set font zoom in cookie
      
    	for (var i in this.tags) {
    		
    		o = $(n+' '+this.tags[i]);
    		
	      o.each(function (index){
	        var oldSize = fontsize.getSizeInPX($(this).css('font-size')); // font-size of current element (jQuery returns this value in pixels)
	        
	        var match = fontsize.reg.exec(oldSize);
	        if (match != null) {
	          var numb = parseFloat(match[1]); // actual font-size, eg: '12', '13.2', '100'
	          var type = match[2];       // type, eg: 'px', '%', 'pt', 'em' (should be in px)
	      
	          switch (type) {
	            case 'px': 
	            	var size = numb + 1 >= this.maxFontSize ? this.maxFontSize : ++numb; 
	              $(this).css({'font-size': size + 'px'}); // set new size for elements in main content
	              break;
	          }  
	        }
	      });
      
    	}
    //window.location.reload(); 
    } 
    else {
    	alert('Już bardziej nie powiększę.');
    	return false;
    }	
    //console.log('zoom='+this.actualZoom+' min='+this.maxZoomOut+' max='+this.maxZoomIn);
  },
  decrement: function(n) { // decrement font size
    if (this.actualZoom > this.maxZoomOut) {
      $.cookie('FONT-ZOOM', --this.actualZoom);
      
    	for (var i in this.tags) {
    		o = $(n+' '+this.tags[i]);
    	
	      o.each(function (index){
	        var oldSize = fontsize.getSizeInPX($(this).css('font-size')); // font-size of current element (jQuery returns this value in pixels)
	        
	        var match = fontsize.reg.exec(oldSize);
	        if (match != null) {
	          var numb = parseFloat(match[1]); // actual font-size, eg: '12', '13.2', '100'
	          var type = match[2];       // type, eg: 'px', '%', 'pt', 'em' (should be in px)
	      
	          switch (type) {
	            case 'px': 
	            	
	            	if (numb - 1 <= this.minFontSize) size = this.minFontSize; 
	            	else size = --numb; 

	              $(this).css({'font-size': size + 'px'}); // set new size for elements in main content
	              break;
	          }  
	        }
	      });
      
    	}
    } 
    else {
    	alert('Bardziej nie da się zmniejszać!');
    	return false;
    }
  },
  reset: function(n) { // reset font size
  	if (this.actualZoom < 0)
  		while (this.actualZoom < 0) this.increment(n);
  	else 
  		while (this.actualZoom > 0) this.decrement(n);
  },
  zoom: function(n) { // set font size from cookie
    
  	var i = this.actualZoom;
  	this.actualZoom = 0;
  	
  	if (i < 0)
  		while (i < 0) {
  			this.decrement(n);
  			i++;
  		}
  	else 
  		while (i > 0) {
  			this.increment(n);
  			i--;
  		}
  }
}


// when page is loaded zoom font size for elements in object
$(document).ready(function(){
  fontsize.zoom( '#content' ); 
});