(function($)
{	
    "use strict";
    
    $(document).ready(function()
    {	
		// decreases header size when user scrolls down
        avia_header_size();
    });
    
    
    function av_change_class($element, change_method, class_name)
	{	
		if($element[0].classList)
		{
			if(change_method == "add") 
			{
				$element[0].classList.add(class_name);
			}
			else
			{
				$element[0].classList.remove(class_name);
			}
		}
		else
		{
			if(change_method == "add") 
			{
				$element.addClass(class_name);
			}
			else
			{
				$element.removeClass(class_name);
			}
		}
	}
	
	
	function avia_header_size()
	{
		var win				= $(window),
			header          = $('.html_header_top.html_header_sticky #header'),
			unsticktop		= $('.av_header_unstick_top');
            
		if( ! header.length && ! unsticktop.length ) 
		{
			return;
		}
        
		var logo            = $('#header_main .container .logo img, #header_main .container .logo a'),
			elements        = $('#header_main .container:not(#header_main_alternate>.container), #header_main .main_menu ul:first-child > li > a:not(.avia_mega_div a, #header_main_alternate a), #header_main #menu-item-shop .cart_dropdown_link'),
			el_height       = $(elements).filter(':first').height(),
			isMobile        = $.avia_utilities.isMobile,
			scroll_top		= $('#scroll-top-link'),
			transparent 	= header.is('.av_header_transparency'),
			shrinking		= header.is('.av_header_shrinking'),
			header_meta		= header.find('#header_meta'),
			topbar_height	= header_meta.length ? header_meta.outerHeight() : 0,
			set_height      = function()
            {	
				var st = win.scrollTop(), 
					newH = 0, 
					st_real = st;
			
				if( unsticktop ) 
				{
					st -= topbar_height;
				} 
				
				if( st < 0 ) 
				{
					st = 0;
				}
				
				if( shrinking && ! isMobile )
				{
					if( st < el_height/2 )
					{
						newH = el_height - st;
						if( st <= 0 )
						{
							newH = el_height;
						}

						av_change_class( header, 'remove', 'header-scrolled' );
						//header.removeClass('header-scrolled');
					}
					else
					{
						newH = el_height/2;
						//header.addClass('header-scrolled');
						av_change_class( header, 'add', 'header-scrolled' );
					}

					if( st - 30 < el_height )
					{
						av_change_class( header, 'remove', 'header-scrolled-full' );
					}
					else
					{
						av_change_class( header, 'add', 'header-scrolled-full' );
					}
	                
	                
					elements.css({'height': newH + 'px', 'lineHeight': newH + 'px'});
					logo.css({'maxHeight': newH + 'px'});
				}
				
				if( unsticktop.length )
				{
					if( st <= 0 )
					{
						if( st_real <= 0 ) 
						{
							st_real = 0;
						}

						unsticktop.css({"margin-top":"-"+st_real+"px"});
					}
					else
					{
						unsticktop.css({"margin-top":"-"+topbar_height+"px"});
					}
				}
                
				if( transparent )
				{	
					if( st > 50 )
					{	
						//header.removeClass('av_header_transparency');
						av_change_class( header, 'remove', 'av_header_transparency' );
					}
					else
					{
						//header.addClass('av_header_transparency');
						av_change_class( header, 'add', 'av_header_transparency' );
					}
				}

               
            };

		if( $('body').is( '.avia_deactivate_menu_resize' ) ) 
		{
			shrinking = false;
		}

		if( ! transparent && ! shrinking && ! unsticktop.length ) 
		{
			return;
		}

		win.on( 'debouncedresize',  function(){ 
								el_height = $( elements ).attr( 'style',"" ).filter( ':first' ).height(); 
								set_height(); 
							});

		win.on( 'scroll',  function(){ 
								window.requestAnimationFrame( set_height ); 
							});

		set_height();
    }


})(jQuery);