/*    4/01/2009
        PikaChoose
    Jquery plugin for photo galleries
    Copyright (C) 2009 Jeremy Fry

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/* thanks to Antonio Terceiro for suggestion and implementation of the multi lang support*/
jQuery.iPikaChoose = {
    build : function(user_options)
    {
        var user_options;
        var defaults = {
            show_captions: true,
            slide_enabled: true,
            auto_play: true,
            show_prev_next: true,
            slide_speed: 5000,
            thumb_width: 50,
            thumb_height: 42,
            buttons_text: { play: "Play", stop: "Stop", previous: "Previous", next: "Next" },
            delay_caption: true,
            user_thumbs: false,
            onChange: false,
            min_width: 300
        };

        return jQuery(this).each(
            function() {
                //bring in options
                var options = jQuery.extend(defaults, user_options);
                // grab our images
                var images = jQuery(this).children('li').children('img');
                //hide the images so the user doesn't see crap
                images.fadeOut(1);
                
                //save our list for future ref
                var ulist = jQuery(this);
                images.each(LoadImages);
                //start building structure
                jQuery(this).before("<div class='pika_main'></div>");
                // houses eveything about the UL
                var main_div = jQuery(this).prev(".pika_main");
                
                //add in slideshow elements when appropriate
                if(options.slide_enabled){
                    main_div.append("<div class='pika_play'></div>");
                    var play_div = jQuery(this).prev(".pika_main").children(".pika_play");
                    play_div.html("<a class='pika_play_button'>" + options.buttons_text.play + "</a><a class='pika_stop_button'>" + options.buttons_text.stop + "</a>");
                    play_div.fadeOut(1);
                    var play_anchor = play_div.children('a:first');
                    var stop_anchor = play_div.children('a:last');
                }

                //this div is used to make image and caption fade together
                var sub_div = $("<div class='pika_subdiv'></div>");
                sub_div.appendTo(main_div);
                
                //the main image we'll be using to load
                sub_div.append("<img />");
                var main_img = sub_div.children("img");
                
                //create the caption div when appropriate
                if(options.show_captions){
                    sub_div.append("<div class='pika_caption'></div>");
                    var caption_div = sub_div.children(".pika_caption");
                }
                
                //navigation div ALWAYS gets created, its refrenced a lot               
                jQuery(this).after("<div class='pika_navigation'></div>");
                var navigation_div = jQuery(this).next(".pika_navigation");
                //fill in sub elements
                navigation_div.prepend("<a>" + options.buttons_text.previous + "</a> | <a>" + options.buttons_text.next + "</a>");
                var previous_image_anchor = navigation_div.children('a:first');
                var next_image_anchor = navigation_div.children('a:last');
                
                //hide the navigation if the user doesn't want it
                if(!options.show_prev_next){
                    navigation_div.css("display","none");
                }
                
                //playing triggers the loop for the slideshow
                var playing = options.auto_play;
                
                main_img.wrap("<a></a>");
                var main_link = main_img.parent("a");
                
                function LoadImages()
                {
                    jQuery(this).bind("load", function()
                    {
                        //had to make a seperate function so that the thumbnails wouldn't have problems
                        //from beings resized before loaded, thus not h/w
    
                        var w = jQuery(this).width();
                        var h = jQuery(this).height();
                        if(w===0){w = jQuery(this).attr("width");}
                        if(h===0){h = jQuery(this).attr("height");}
                        //grab a ratio for image to user defined settings
                        var rw = options.thumb_width/w;
                        var rh = options.thumb_height/h;
                        
                        //determine which has the smallest ratio (thus needing
                        //to be the side we use to scale so our whole thumb is filled)
                        if(rw<rh){
                            //we'll use ratio later to scale and not distort
                            var ratio = rh;
                            var left = ((w*ratio-options.thumb_width)/2)*-1;
                            left = Math.round(left);
                            //set images left offset to match
                            jQuery(this).css({left:left});
                        }else{
                            var ratio = rw;
                            //you can uncoment this lines to have the vertical picture centered
                            //but usually tall photos have the focal point at the top...
                            //var top = ((h*ratio-options.thumb_height)/2)*-1;
                            //var top = Math.round(top);
                            var top = 0;
                            jQuery(this).css({top:top});
                        }
                        //use those ratios to calculate scale
                        var width = Math.round(w*ratio);
                        var height = Math.round(h*ratio);
                        jQuery(this).css("position","relative");
                        jQuery(this).width(width).height(height);
                        var imgcss={
                            width: width,
                            height: height
                        };
                        jQuery(this).css(imgcss);                   
                        jQuery(this).hover(
                            function(){jQuery(this).fadeTo(250,1);},
                            function(){if(!jQuery(this).hasClass("pika_selected")){jQuery(this).fadeTo(250,0.4);}}
                        );
                        jQuery(this).fadeTo(250,0.4);   
                        
                        if(jQuery(this).hasClass('pika_first')){
                            jQuery(this).trigger("click",["auto"]);
                        }
                        
                    });
                
                    //clone so the on loads will fire correctly
                    var newImage = jQuery(this).clone(true).insertAfter(this);
                    
                    jQuery(this).remove();
    
                    //reset images to the clones
                    images = ulist.children('li').children('img');
                }
            function activate()
            {
                //sets the intial phase for everything
                
                //image_click is controls the fading
                images.bind("click",image_click);
                //hiding refrence to slide elements if slide is disabled
                if(options.slide_enabled){
                    if(options.auto_play){
                        playing = true;
                        play_anchor.hide();
                        stop_anchor.show();
                    }else{
                        play_anchor.show();
                        stop_anchor.hide();
                    }
                }
                
                images.filter(":last").addClass("pika_last");
                images.filter(":first").addClass("pika_first");
                //css for the list
                var licss = {
                    width: options.thumb_width+"px",
                    height: options.thumb_height+"px",
                    "list-style": "none",
                    overflow: "hidden"
                };
                images.each(function(){
                    jQuery(this).parent('li').css(licss);
                    //fixes a bug where images don't get the correct display after loading
                    if(jQuery(this).attr('complete')==true && jQuery(this).css('display')=="none")
                    {
                        jQuery(this).css({display:'inline'});
                    }
                });
                //previous link to go back an image
                previous_image_anchor.bind("click",previous_image);
                //ditto for forward, also the item that gets auto clicked for slideshow
                next_image_anchor.bind("click",next_image); 
            }//end activate function

            function image_click(event, how){
                    //catch when user clicks on an image Then cancel current slideshow
                    if(how!="auto"){
                        if(options.slide_enabled){
                            stop_anchor.hide();
                            play_anchor.show();
                            playing=false;
                        }
                        main_img.stop();
                        main_img.dequeue();
                        if(options.show_captions)
                        {
                            caption_div.stop();
                            caption_div.dequeue();
                        }
                    }
                    //all our image variables
                    if(options.user_thumbs) {       
                        var image_source = jQuery(this).attr("ref");
                    } else {
                        var image_source = jQuery(this).attr("src");
                    }
                    var image_link = jQuery(this).attr("ref");
                    var image_width = jQuery(this).attr("__width");
                    var image_height = jQuery(this).attr("__height");
                    var image_caption = jQuery(this).next("span").html();
                                
                    //fade out the old thumb
                    images.filter(".pika_selected")
                        .fadeTo(250, 0.4) 
                        .removeClass("pika_selected"); 

                    //fade in the new thumb
                    jQuery(this).fadeTo(250,1);
                    jQuery(this).addClass("pika_selected");
                    //fade the old image out and the new one in
                    if(options.show_captions)
                    {
                        if(options.delay_caption)
                        {
                            caption_div.fadeTo(800,0);
                        }
                        caption_div.fadeTo(500,0,function(){
                            caption_div.html(image_caption);
                            caption_div.fadeTo(800,1);
                        });
                    }

                    // change src
                    main_img.fadeTo(500,0.05,function(){

                        // center image
                        if (image_width < options.min_width) {
                            main_img.css('padding-left', (options.min_width - image_width) / 2 + 'px');
                        } else {
                            main_img.css('padding-left', 0);
                        }

                        // resize frame
                        if ($.isFunction(options.onChange)) {
                            var new_h = image_height - 0 + $('.pika_navigation').height() + $('.sliderjs').height();
                            options.onChange({
                                width    : image_width,
                                height   : new_h,
                                minHeight: new_h
                            });
                        }

                        main_img.attr("src",image_source);
                        main_link.attr("href", image_link);
                        main_img.fadeTo(800,1,function(){
                            if(playing){
                                jQuery(this).animate({top:0},options.slide_speed, function(){
                                    //redudency needed here to catch the user clicking on an image during a change.
                                    if(playing){next_image_anchor.trigger("click",["auto"]);}
                                });
                            }
                        });
                    });

            }//end image_click function

            function next_image(event, how){
                if(images.filter(".pika_selected").hasClass("pika_last")){
                    images.filter(":first").trigger("click",how);
                }else{
                    images.filter(".pika_selected").parent('li').next('li').children('img').trigger("click",how);
                }
            }//end next image function
            
            function previous_image(event, how){
                if(images.filter(".pika_selected").hasClass("pika_first")){
                    images.filter(":last").trigger("click",how);
                }else{
                    images.filter(".pika_selected").parent('li').prev('li').children('img').trigger("click",how);
                }
            }//end previous image function
            
            function play_button(){
                main_div.hover(
                    function(){play_div.fadeIn(400);},
                    function(){play_div.fadeOut(400);}
                );
                play_anchor.bind("click", function(){
                    main_img.stop();
                    main_img.dequeue();
                    if(options.show_captions)
                    {
                        caption_div.stop();
                        caption_div.dequeue();
                    }
                    playing = true;
                    next_image_anchor.trigger("click",["auto"]);
                    jQuery(this).hide();
                    stop_anchor.show();
                });
                stop_anchor.bind("click", function(){
                    playing = false;
                    jQuery(this).hide();
                    play_anchor.show();
                });
            }
            if(options.slide_enabled){play_button();}
            activate();

        });//end return this.each
    }//end build function
    
    //activate applies the appropriate actions to all the different parts of the structure.
    //and loads the sets the first image
};//end jquery.ipikachoose      
jQuery.fn.PikaChoose = jQuery.iPikaChoose.build;