/*

    GalleryView - jQuery Content Gallery Plugin
    Author:             Jack Anderson
    Version:            1.1 (April 5, 2009)
    Documentation:      http://www.spaceforaname.com/jquery/galleryview/
    
    Please use this development script if you intend to make changes to the
    plugin code.  For production sites, please use jquery.galleryview-1.0.1-pack.js.
    
*/
(function($){
    $.fn.galleryView = function(options) {
        var opts = $.extend($.fn.galleryView.defaults,options);
        
        var id;
        var iterator = 0;
        var gallery_width;
        var gallery_height;
        var frame_margin = 10;
        var strip_width;
        var wrapper_width;
        var item_count = 0;
        var slide_method;
        var img_path;
        var paused = false;
        var frame_caption_size = 20;
        var frame_margin_top = 5;
        var pointer_width = 2;
        
        //Define jQuery objects for reuse
        var j_gallery;
        var j_filmstrip;
        var j_frames;
        var j_panels;
        var j_pointer;
        
/************************************************/
/*      Plugin Methods                                                          */
/************************************************/      
        function showItem(i) {
            //Disable next/prev buttons until transition is complete
            $('img.nav-next').unbind('click');
            $('img.nav-prev').unbind('click');
            j_frames.unbind('click');
            if(has_panels) {
                if(opts.fade_panels) {
                    //Fade out all panels and fade in target panel
                    j_panels.fadeOut(opts.transition_speed).eq(i%item_count).fadeIn(opts.transition_speed,function(){
                        if(!has_filmstrip) {
                            $('img.nav-prev').click(showPrevItem);
                            $('img.nav-next').click(showNextItem);              
                        }
                    });
                } 
            }
            
            if(has_filmstrip) {
                //Slide either pointer or filmstrip, depending on transition method
                if(slide_method=='strip') {
                    //Stop filmstrip if it's currently in motion
                    j_filmstrip.stop();
                    
                    //Determine distance between pointer (eventual destination) and target frame
                    var distance = getPos(j_frames[i]).left - (getPos(j_pointer[0]).left+2);
                    var leftstr = (distance>=0?'-=':'+=')+Math.abs(distance)+'px';
                    
                    //Animate filmstrip and slide target frame under pointer
                    //If target frame is a duplicate, jump back to 'original' frame
                    j_filmstrip.animate({
                        'left':leftstr
                    },opts.transition_speed,opts.easing,function(){
                        //Always ensure that there are a sufficient number of hidden frames on either
                        //side of the filmstrip to avoid empty frames
                        if(i>item_count) {
                            i = i%item_count;
                            iterator = i;
                            j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*i)+'px');
                        } else if (i<=(item_count-strip_size)) {
                            i = (i%item_count)+item_count;
                            iterator = i;
                            j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*i)+'px');
                        }
                        
                        if(!opts.fade_panels) {
                            j_panels.hide().eq(i%item_count).show();
                        }
                        $('img.nav-prev').click(showPrevItem);
                        $('img.nav-next').click(showNextItem);
                        enableFrameClicking();
                    });
                } else if(slide_method=='pointer') {
                    //Stop pointer if it's currently in motion
                    j_pointer.stop();
                    //Get position of target frame
                    var pos = getPos(j_frames[i]);
                    //Slide the pointer over the target frame
                    j_pointer.animate({
                        'left':(pos.left-2+'px')
                    },opts.transition_speed,opts.easing,function(){     
                        if(!opts.fade_panels) {
                            j_panels.hide().eq(i%item_count).show();
                        }       
                        $('img.nav-prev').click(showPrevItem);
                        $('img.nav-next').click(showNextItem);
                        enableFrameClicking();
                    });
                }
            
                if($('a',j_frames[i])[0]) {
                    j_pointer.unbind('click').click(function(){
                        var a = $('a',j_frames[i]).eq(0);
                        if(a.attr('target')=='_blank') {window.open(a.attr('href'));}
                        else {location.href = a.attr('href');}
                    });
                }
            }
        };
        function showNextItem() {
            $(document).stopTime("transition");
            if(++iterator==j_frames.length) {iterator=0;}
            showItem(iterator);
            $(document).everyTime(opts.transition_interval,"transition",function(){
                showNextItem();
            });
        };
        function showPrevItem() {
            $(document).stopTime("transition");
            if(--iterator<0) {iterator = item_count-1;}
            //alert(iterator);
            showItem(iterator);
            $(document).everyTime(opts.transition_interval,"transition",function(){
                showNextItem();
            });
        };
        function getPos(el) {
            var left = 0, top = 0;
            var el_id = el.id;
            if(el.offsetParent) {
                do {
                    left += el.offsetLeft;
                    top += el.offsetTop;
                } while(el = el.offsetParent);
            }
            //If we want the position of the gallery itself, return it
            if(el_id == id) {return {'left':left,'top':top};}
            //Otherwise, get position of element relative to gallery
            else {
                var gPos = getPos(j_gallery[0]);
                var gLeft = gPos.left;
                var gTop = gPos.top;
                
                return {'left':left-gLeft,'top':top-gTop};
            }
        };
        function enableFrameClicking() {
            j_frames.each(function(i){
                //If there isn't a link in this frame, set up frame to slide on click
                //Frames with links will handle themselves
                if($('a',this).length==0) {
                    $(this).click(function(){
                        $(document).stopTime("transition");
                        showItem(i);
                        iterator = i;
                        $(document).everyTime(opts.transition_interval,"transition",function(){
                            showNextItem();
                        });
                    });
                }
            });
        };
        
        function buildPanels() {
            //If there are panel captions, add overlay divs
            if($('.panel-overlay').length>0) {j_panels.append('<div class="overlay"></div>');}
            
            if(!has_filmstrip) {
                //Add navigation buttons
                $('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.gif').appendTo(j_gallery).css({
                    'position':'absolute',
                    'zIndex':'1100',
                    'cursor':'pointer',
                    'top':((opts.panel_height-22)/2)+'px',
                    'right':'10px',
                    'display':'none'
                }).click(showNextItem);
                $('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.gif').appendTo(j_gallery).css({
                    'position':'absolute',
                    'zIndex':'1100',
                    'cursor':'pointer',
                    'top':((opts.panel_height-22)/2)+'px',
                    'left':'10px',
                    'display':'none'
                }).click(showPrevItem);
                
                $('<img />').addClass('nav-overlay').attr('src',img_path+opts.nav_theme+'/panel-nav-next.gif').appendTo(j_gallery).css({
                    'position':'absolute',
                    'zIndex':'1099',
                    'top':((opts.panel_height-22)/2)-10+'px',
                    'right':'0',
                    'display':'none'
                });
                
                $('<img />').addClass('nav-overlay').attr('src',img_path+opts.nav_theme+'/panel-nav-prev.gif').appendTo(j_gallery).css({
                    'position':'absolute',
                    'zIndex':'1099',
                    'top':((opts.panel_height-22)/2)-10+'px',
                    'left':'0',
                    'display':'none'
                });
            }
            j_panels.css({
                'width':(opts.panel_width-parseInt(j_panels.css('paddingLeft').split('px')[0],10)-parseInt(j_panels.css('paddingRight').split('px')[0],10))+'px',
                'height':(opts.panel_height-parseInt(j_panels.css('paddingTop').split('px')[0],10)-parseInt(j_panels.css('paddingBottom').split('px')[0],10))+'px',
                'position':'absolute',
                'top':(opts.filmstrip_position=='top'?(opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top))+'px':'0px'),
                'left':'0px',
                'overflow':'hidden',
                'background':'white',
                'display':'none'
            });
            $('.panel-overlay',j_panels).css({
                'position':'absolute',
                'zIndex':'999',
                'width':(opts.panel_width-20)+'px',
                'height':opts.overlay_height+'px',
                'top':(opts.overlay_position=='top'?'0':opts.panel_height-opts.overlay_height+'px'),
                'left':'0',
                'padding':'0 10px',
                'color':opts.overlay_text_color,
                'fontSize':opts.overlay_font_size
            });
            $('.panel-overlay a',j_panels).css({
                'color':opts.overlay_text_color,
                'textDecoration':'underline',
                'fontWeight':'bold'
            });
            $('.overlay',j_panels).css({
                'position':'absolute',
                'zIndex':'998',
                'width':opts.panel_width+'px',
                'height':opts.overlay_height+'px',
                'top':(opts.overlay_position=='top'?'0':opts.panel_height-opts.overlay_height+'px'),
                'left':'0',
                'background':opts.overlay_color,
                'opacity':opts.overlay_opacity
            });
            $('.panel iframe',j_panels).css({
                'width':opts.panel_width+'px',
                'height':(opts.panel_height-opts.overlay_height)+'px',
                'border':'0'
            });
        };
        
        function buildFilmstrip() {
            //Add wrapper to filmstrip to hide extra frames
            j_filmstrip.wrap('<div class="strip_wrapper"></div>');
            if(slide_method=='strip') {
                j_frames.clone().appendTo(j_filmstrip);
                j_frames.clone().appendTo(j_filmstrip);
                j_frames = $('li',j_filmstrip);
            }
            //If captions are enabled, add caption divs and fill with the image titles
            if(opts.show_captions) {
                j_frames.append('<div class="caption"></div>').each(function(i){
                    $(this).find('.caption').html($(this).find('img').attr('title'));                      
                });
            }
            
            j_filmstrip.css({
                'listStyle':'none',
                'margin':'0',
                'padding':'0',
                'width':strip_width+'px',
                'position':'absolute',
                'zIndex':'900',
                'top':'0',
                'left':'0',
                'height':(opts.frame_height+10)+'px',
                'background':opts.background_color
            });
            j_frames.css({
                'float':'left',
                'position':'relative',
                'height':opts.frame_height+'px',
                'zIndex':'901',
                'marginTop':frame_margin_top+'px',
                'marginBottom':'0px',
                'marginRight':frame_margin+'px',
                'padding':'0',
                'cursor':'pointer'
            });
            $('img',j_frames).css({
                'border':'none'
            });
            $('.strip_wrapper',j_gallery).css({
                'position':'absolute',
                'top':(opts.filmstrip_position=='top'?'0px':opts.panel_height+'px'),
                'left':((gallery_width-wrapper_width)/2)+'px',
                'width':wrapper_width+'px',
                'height':(opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top))+'px',
                'overflow':'hidden'
            });
            $('.caption',j_gallery).css({
                'position':'absolute',
                'top':opts.frame_height+'px',
                'left':'0',
                'margin':'0',
                'width':opts.frame_width+'px',
                'padding':'0',
                'color':opts.caption_text_color,
                'textAlign':'center',
                'fontSize':'10px',
                'height':frame_caption_size+'px',
                
                'lineHeight':frame_caption_size+'px'
            });
            var pointer = $('<div></div>');
            pointer.attr('id','pointer').appendTo(j_gallery).css({
                 'position':'absolute',
                 'zIndex':'1000',
                 'cursor':'pointer',
                 'top':getPos(j_frames[0]).top-(pointer_width/2)+'px',
                 'left':getPos(j_frames[0]).left-(pointer_width/2)+'px',
                 'height':opts.frame_height-pointer_width+'px',
                 'width':opts.frame_width-pointer_width+'px',
                 'border':(has_panels?pointer_width+'px solid '+(opts.nav_theme=='dark'?'black':'white'):'none')
            });
            j_pointer = $('#pointer',j_gallery);
            if(has_panels) {
                var pointerArrow = $('<img />');
                pointerArrow.attr('src',img_path+opts.nav_theme+'/pointer'+(opts.filmstrip_position=='top'?'-down':'')+'.gif').appendTo($('#pointer')).css({
                    'position':'absolute',
                    'zIndex':'1001',
                    'top':(opts.filmstrip_position=='bottom'?'-'+(10+pointer_width)+'px':opts.frame_height+'px'),
                    'left':((opts.frame_width/2)-10)+'px'
                });
            }
            
            //If the filmstrip is animating, move the strip to the middle third
            if(slide_method=='strip') {
                j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*item_count)+'px');
                iterator = item_count;
            }
            //If there's a link under the pointer, enable clicking on the pointer
            if($('a',j_frames[iterator])[0]) {
                j_pointer.click(function(){
                    var a = $('a',j_frames[iterator]).eq(0);
                    if(a.attr('target')=='_blank') {window.open(a.attr('href'));}
                    else {location.href = a.attr('href');}
                });
            }
            
            //Add navigation buttons
            $('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.gif').appendTo(j_gallery).css({
                'position':'absolute',
                'cursor':'pointer',
                'top':(opts.filmstrip_position=='top'?0:opts.panel_height)+frame_margin_top+((opts.frame_height-22)/2)+'px',
                'right':(gallery_width/2)-(wrapper_width/2)-10-22+'px'
            }).click(showNextItem);
            $('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.gif').appendTo(j_gallery).css({
                'position':'absolute',
                'cursor':'pointer',
                'top':(opts.filmstrip_position=='top'?0:opts.panel_height)+frame_margin_top+((opts.frame_height-22)/2)+'px',
                'left':(gallery_width/2)-(wrapper_width/2)-10-22+'px'
            }).click(showPrevItem);
        };
        
        //Check mouse to see if it is within the borders of the panel
        //More reliable than 'mouseover' event when elements overlay the panel
        function mouseIsOverPanels(x,y) {               
            var pos = getPos(j_gallery[0]);
            var top = pos.top;
            var left = pos.left;
            return x > left && x < left+opts.panel_width && y > top && y < top+opts.panel_height;                               
        };
        
/************************************************/
/*      Main Plugin Code                                                        */
/************************************************/
        return this.each(function() {
            j_gallery = $(this);
            //Determine path between current page and filmstrip images
            //Scan script tags and look for path to GalleryView plugin
            $('script').each(function(i){
                var s = $(this);
                if(s.attr('src') && s.attr('src').match(/jquery\.galleryview/)){
                    img_path = s.attr('src').split('jquery.galleryview')[0]+'themes/';  
                }
            });
            
            //Hide gallery to prevent Flash of Unstyled Content (FoUC) in IE
            j_gallery.css('visibility','hidden');
            
            //Assign elements to variables for reuse
            j_filmstrip = $('.filmstrip',j_gallery);
            j_frames = $('li',j_filmstrip);
            j_panels = $('.panel',j_gallery);
            
            id = j_gallery.attr('id');
            
            has_panels = j_panels.length > 0;
            has_filmstrip = j_frames.length > 0;
            
            if(!has_panels) opts.panel_height = 0;
            
            //Number of frames in filmstrip
            item_count = has_panels?j_panels.length:j_frames.length;
            
            //Number of frames that can display within the screen's width
            //64 = width of block for navigation button * 2
            //5 = minimum frame margin
            strip_size = has_panels?Math.floor((opts.panel_width-64)/(opts.frame_width+frame_margin)):Math.min(item_count,opts.filmstrip_size); 
            
            
            /************************************************/
            /*  Determine transition method for filmstrip       */
            /************************************************/
                    //If more items than strip size, slide filmstrip
                    //Otherwise, slide pointer
                    if(strip_size >= item_count) {
                        slide_method = 'pointer';
                        strip_size = item_count;
                    }
                    else {slide_method = 'strip';}
            
            /************************************************/
            /*  Determine dimensions of various elements        */
            /************************************************/
                    
                    //Width of gallery block
                    gallery_width = has_panels?opts.panel_width:(strip_size*(opts.frame_width+frame_margin))-frame_margin+64;
                    
                    //Height of gallery block = screen + filmstrip + captions (optional)
                    gallery_height = (has_panels?opts.panel_height:0)+(has_filmstrip?opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top):0);
                    
                    //Width of filmstrip
                    if(slide_method == 'pointer') {strip_width = (opts.frame_width*item_count)+(frame_margin*(item_count));}
                    else {strip_width = (opts.frame_width*item_count*3)+(frame_margin*(item_count*3));}
                    
                    //Width of filmstrip wrapper (to hide overflow)
                    wrapper_width = ((strip_size*opts.frame_width)+((strip_size-1)*frame_margin));
            
            /************************************************/
            /*  Apply CSS Styles                                                        */
            /************************************************/
                    j_gallery.css({
                        'position':'relative',
                        'margin':'0',
                        'background':opts.background_color,
                        'border':opts.border,
                        'width':gallery_width+'px',
                        'height':gallery_height+'px'
                    });
            
            /************************************************/
            /*  Build filmstrip and/or panels                           */
            /************************************************/
                    if(has_filmstrip) {
                        buildFilmstrip();
                    }
                    if(has_panels) {
                        buildPanels();
                    }

            
            /************************************************/
            /*  Add events to various elements                          */
            /************************************************/
                    if(has_filmstrip) enableFrameClicking();
                    
                        
                        
                        $().mousemove(function(e){                                                      
                            if(mouseIsOverPanels(e.pageX,e.pageY)) {
                                if(opts.pause_on_hover) {
                                    $(document).oneTime(500,"animation_pause",function(){
                                        $(document).stopTime("transition");
                                        paused=true;
                                    });
                                }
                                if(has_panels && !has_filmstrip) {
                                    $('.nav-overlay').fadeIn('fast');
                                    $('.nav-next').fadeIn('fast');
                                    $('.nav-prev').fadeIn('fast');
                                }
                            } else {
                                if(opts.pause_on_hover) {
                                    $(document).stopTime("animation_pause");
                                    if(paused) {
                                        $(document).everyTime(opts.transition_interval,"transition",function(){
                                            showNextItem();
                                        });
                                        paused = false;
                                    }
                                }
                                if(has_panels && !has_filmstrip) {
                                    $('.nav-overlay').fadeOut('fast');
                                    $('.nav-next').fadeOut('fast');
                                    $('.nav-prev').fadeOut('fast');
                                }
                            }
                        });
            
            
            /************************************************/
            /*  Initiate Automated Animation                            */
            /************************************************/
                    //Show the first panel
                    j_panels.eq(0).show();

                    //If we have more than one item, begin automated transitions
                    if(item_count > 1) {
                        $(document).everyTime(opts.transition_interval,"transition",function(){
                            showNextItem();
                        });
                    }
                    
                    //Make gallery visible now that work is complete
                    j_gallery.css('visibility','visible');
        });
    };
    
    $.fn.galleryView.defaults = {
        panel_width: 400,
        panel_height: 300,
        frame_width: 80,
        frame_height: 80,
        filmstrip_size: 3,
        overlay_height: 70,
        overlay_font_size: '1em',
        transition_speed: 400,
        transition_interval: 6000,
        overlay_opacity: 0.6,
        overlay_color: 'black',
        background_color: 'black',
        overlay_text_color: 'white',
        caption_text_color: 'white',
        border: '1px solid black',
        nav_theme: 'light',
        easing: 'swing',
        filmstrip_position: 'bottom',
        overlay_position: 'bottom',
        show_captions: false,
        fade_panels: true,
        pause_on_hover: false
    };
})(jQuery);