/**
* Purpose:              Font sizer class, handles increasing and decreasing font size of a page.
*                       It increases the font in 10% increments. By getting the level / 10 + 1.
*                       i.e. level 2 is .2 + 1 so 1.2 or 120%.
*
* Requires:             JQuery and the JQuery cookies plugin.
*
* Use:                  Setup the fontsizer $.FontSizer.Init(options); the two options are
*                       min and max, for the min level and max level.
*                       Defaults are min: -3 and max: 5.
*
* Author:               Stefan Sedich (stefan.sedich@gmail.com
*/
$.FontSizer = {

        level: 0,

        options : {            
                min: -4,
                max: 0.5
        },

        Init : function(options) {
        if(options)
				$.FontSizer.options = $.extend($.FontSizer.options, options);
					 
					 var initialSize = -2; // set this to initial size. i.e. 0 means 1em by default
					 
                //Get the current level from cookies.
                var level = ($.cookie('font_level') != null) ? $.cookie('font_level') : parseFloat(initialSize);                      

                //Set the font size to the current leve.
                $.FontSizer.SetSize(level);
        },

        IncreaseSize : function() {
                if(($.FontSizer.level) + 1 <= $.FontSizer.options.max) {            
                        //If we have not exceded the max level,
                        //Get the next level and the set the size to this level.
                        var next = parseFloat($.FontSizer.level) + 1;
                        $.FontSizer.SetSize(next);  
                }

        },

        DecreaseSize : function() {
                if(($.FontSizer.level - 1) >= $.FontSizer.options.min) {
                        //If we have not exceded the min level,
                        //Get the next level and the set the size to this level.
                        var next = parseFloat($.FontSizer.level) - 1;
                        $.FontSizer.SetSize(next);  
                }      
        },      

        SetSize: function(level) {

                //Set the current level in the member variable and the cookie.
                $.FontSizer.level = parseFloat(level);      
                $.cookie('font_level', parseFloat(level), { path: '/'});
                //Work out the new em value and set it.
                var level = (level / 10) + 1;
                $("#main_content, #footer, #home_content, #rhs").css("fontSize", level+"em");   

        },

        Reset: function() {
            
            //Reset the level back to 0
            $.FontSizer.SetSize(0);
        
        }

}; 

$(document).ready(function(){
	
	// FontSizer
	var options = { min: -4, max: 3};
	//Initialize the font sizer for the site.
	$.FontSizer.Init(options);
	$("#text_utility_decrease").click(function(){
		$.FontSizer.DecreaseSize();
		return false;
	});
	
	$("#text_utility_increase").click(function() {
		$.FontSizer.IncreaseSize();
		return false;
	});
});