$(function() {
    /* name of the selected album, in the top right combo box */
    var album	= $('#albumSelect div').html();
    /* mode is small or expanded, depending on the picture size  */
    var mode = 'small';
    /* this is the index of the last clicked picture */
    var current = 0;
	
    /* first, let's build the thumbs for the selected album */
    buildThumbs();
	
    /*
    clicking on a thumb loads the image
    (alt attribute of the thumb is the source of the large image);
    mouseover and mouseout for a nice spotlight hover effect
    */
    $('#thumbsContainer img').live('click',function(){
        loadPhoto($(this),'cursorPlus');
    }).live('mouseover',function(){
        var $this   = $(this);
        $this.stop().animate({
            'opacity':'1.0'
        },200);
    }).live('mouseout',function(){
        var $this   = $(this);
        $this.stop().animate({
            'opacity':'0.4'
        },200);
    });
    /* when resizing the window resize the picture */
    $(window).bind('resize', function() {
        resize($('#displayed'),0);
    });
    /* Album Combo Events to open, close, and select an album from the combo */
    $('#albumSelect div').bind('click',function(){
        var $this = $(this);
        if($this.is('.up'))
            closeAlbumCombo();
        else if($this.is('.down'))
            openAlbumCombo();
    });
    $('#albumSelect ul > li').bind('click',function(){
        var $this 	= $(this);
        album 		= $this.find('a').html();
        buildThumbs();
        var $combo = $('#albumSelect div');
        $this.find('a').html($combo.html());
        $combo.html(album);
        closeAlbumCombo();
        orderCombo($this.parent());
    });
    /*
	when hovering the main image change the mouse icons (left,right,plus,minus) 
	also when clicking on the image, expand it or make it smaller depending on the mode
	*/
    $('#displayed').live('mousemove',function(e){
        var $this 	= $(this);
        var imageWidth 	= parseFloat($this.css('width'),10);
		
        var x = e.pageX - $this.offset().left;
        if(x<(imageWidth/3))
            $this.addClass('cursorLeft')
            .removeClass('cursorPlus cursorRight cursorMinus');
        else if(x>(2*(imageWidth/3)))
            $this.addClass('cursorRight')
            .removeClass('cursorPlus cursorLeft cursorMinus');
        else{
            if(mode=='expanded'){
                $this.addClass('cursorMinus')
                .removeClass('cursorLeft cursorRight cursorPlus');
            }
            else if(mode=='small'){
                $this.addClass('cursorPlus')
                .removeClass('cursorLeft cursorRight cursorMinus');
            }
        }
    }).live('click',function(){
        var $this = $(this);
        if(mode=='expanded' && $this.is('.cursorMinus')){
            mode='small';
            $this.addClass('cursorPlus')
            .removeClass('cursorLeft cursorRight cursorMinus');
            $('#thumbsWrapper').stop().animate({
                'bottom':'0px'
            },300);
            resize($this,1);
        }
        else if(mode=='small' && $this.is('.cursorPlus')){
            mode='expanded';
            $this.addClass('cursorMinus')
            .removeClass('cursorLeft cursorRight cursorPlus');
            $('#thumbsWrapper').stop().animate({
                'bottom':'-140px'
            },300);
            resize($this,1);
        }
        else if($this.is('.cursorRight')){
			
            var $thumb = $('#thumbsContainer img:nth-child('+parseInt(current+1)+')');
            if($thumb.length){
                ++current;
                loadPhoto($thumb,'cursorRight');
            }
        }
        else if($this.is('.cursorLeft')){
            var $thumb = $('#thumbsContainer img:nth-child('+parseInt(current-1)+')');
            if($thumb.length){
                --current;
                loadPhoto($thumb,'cursorLeft');
            }
        }
    });
    /*
    function to build the thumbs container
    An AJAX request is made to retrieve the
    photo locations of the selected album
    */
    function buildThumbs(){
        current=1;
        $('#imageWrapper').empty();
        $('#loading').show();
        $.get('ajax/thumbs.php?album='+album, function(data) {
            var countImages = data.length;
            var count = 0;
            var $tContainer = $('<div/>',{
                id	: 'thumbsContainer',
                style	: 'visibility:hidden;'
            })
            for(var i = 0; i < countImages; ++i){
                try{
                    var description = data[i].desc[0];
                }catch(e){
                    description='';
                }
                if(description==undefined)
                    description='';
                $('<img title="'+description+'" alt="'+data[i].alt+'" height="75" />').load(function(){
                    var $this = $(this);
                    $tContainer.append($this);
                    ++count;
                    if(count==1){
                        /* load 1 image into container*/
                        $('<img id="displayed" style="display:block;" class="cursorPlus"/>').load(function(){
                            var $first = $(this);
                            $('#loading').hide();
                            resize($first,0);
                            $('#imageWrapper').append($first);
                            $('#description').html($this.attr('title'));
                        }).attr('src',$this.attr('alt'));
                    }
                    if(count == countImages){
                        $('#thumbsWrapper').empty().append($tContainer);
                        thumbsDim($tContainer);
                        makeScrollable($('#thumbsWrapper'),$tContainer,15);
                    }
                }).attr('src',data[i].src);
            }
        },'json');
    }
    /* adjust the size (width) of the scrollable container
    - this depends on all its images widths
    */
    function thumbsDim($elem){
        var finalW = 0;
        $elem.find('img').each(function(i){
            var $img 		= $(this);
            finalW+=$img.width()+5;
        //plus 5 -> 4 margins + 1 to avoid rounded calculations
        });
        $elem.css('width',finalW+'px').css('visibility','visible');
    }
    /*
    loads a picture into the imageWrapper
    the image source is in the thumb's alt attribute
    */
    function loadPhoto($thumb,cursorClass){
        current		= $thumb.index()+1;
        $('#imageWrapper').empty();
        $('#loading').show();
        $('<img id="displayed" title="'+$thumb.attr('title')+'" class="'+cursorClass+'" style="display:none;"/>').load(function(){
            var $this = $(this);
            $('#loading').hide();
            resize($this,0);
            if(!$('#imageWrapper').find('img').length){
                $('#imageWrapper').append($this.fadeIn(800));
                $('#description').html($this.attr('title'));
            }
        }).attr('src',$thumb.attr('alt'));
    }
    //functions to control the albums combos
    function closeAlbumCombo(){
        var $combo = $('#albumSelect div');
        $combo.addClass('down').removeClass('up');
        $combo.prev().hide();
    }
    function openAlbumCombo(){
        var $combo = $('#albumSelect div');
        $combo.addClass('up').removeClass('down');
        $combo.prev().show();
    }
    function orderCombo($ul){
        var items = $ul.find('li').get();
        items.sort(function(a,b){
            var keyA = $(a).text();
            var keyB = $(b).text();

            if (keyA < keyB) return -1;
            if (keyA > keyB) return 1;
            return 0;
        });
        $.each(items, function(i, li){
            $ul.append(li);
        });
    }
    //Get our elements for faster access and set overlay width
    function makeScrollable($wrapper, $container, contPadding){
        //Get menu width
        var divWidth = $wrapper.width();

        //Remove scrollbars
        $wrapper.css({
            overflow: 'hidden'
        });

        //Find last image container
        var lastLi = $container.find('img:last-child');
        $wrapper.scrollLeft(0);
        //When user move mouse over menu
        $wrapper.unbind('mousemove').bind('mousemove',function(e){

            //As images are loaded ul width increases,
            //so we recalculate it each time
            var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + contPadding;

            var left = (e.pageX - $wrapper.offset().left) * (ulWidth-divWidth) / divWidth;
            $wrapper.scrollLeft(left);
        });
    }
    /* function to resize an image based on the windows width and height */
    function resize($image, type){
        var widthMargin     = 10
        var heightMargin    = 0;
        if(mode=='expanded')
            heightMargin = 100;
        else if(mode=='small')
            heightMargin = 200;
        //type 1 is animate, type 0 is normal
        var windowH      = $(window).height()-heightMargin;
        var windowW      = $(window).width()-widthMargin;
        var theImage     = new Image();
        theImage.src     = $image.attr("src");
        var imgwidth     = theImage.width;
        var imgheight    = theImage.height;

        if((imgwidth > windowW)||(imgheight > windowH)){
            if(imgwidth > imgheight){
                var newwidth = windowW;
                var ratio = imgwidth / windowW;
                var newheight = imgheight / ratio;
                theImage.height = newheight;
                theImage.width= newwidth;
                if(newheight>windowH){
                    var newnewheight = windowH;
                    var newratio = newheight/windowH;
                    var newnewwidth =newwidth/newratio;
                    theImage.width = newnewwidth;
                    theImage.height= newnewheight;
                }
            }
            else{
                var newheight = windowH;
                var ratio = imgheight / windowH;
                var newwidth = imgwidth / ratio;
                theImage.height = newheight;
                theImage.width= newwidth;
                if(newwidth>windowW){
                    var newnewwidth = windowW;
                    var newratio = newwidth/windowW;
                    var newnewheight =newheight/newratio;
                    theImage.height = newnewheight;
                    theImage.width= newnewwidth;
                }
            }
        }
        if((type==1)&&(!$.browser.msie))
            $image.stop(true).animate({
                'width':theImage.width+'px',
                'height':theImage.height+'px'
            },400);
        else
            $image.css({
                'width':theImage.width+'px',
                'height':theImage.height+'px'
            });
    }
});