/*

        GalleryView - jQuery Content Gallery Plugin
        Author:                 Jack Anderson
        Version:                1.0
        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-pack.js.

*/
(function($){
        $.fn.galleryView = function(options) {
                var opts = $.extend($.fn.galleryView.defaults,options);

                var si;
                var id;
                var iterator = 0;
                var gallery_width;
                var gallery_height;
                var frame_margin;
                var strip_width;
                var strip_margin;
                var wrapper_width;
                var currentPosition = 0;
                var item_count = 0;
                var slide_method;
                var f;
                var img_path;
                var paused = false;
                var frame_caption_size = 20;
                var frame_margin_top = 5;

                //Define jQuery objects for reuse
                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');
                        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);
                        }

                        //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(){
                                        if(i>=(item_count*2) || 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();
                                        }
                                        currentPosition = i;
                                        $('img.nav-prev').click(jumpToPrevItem);
                                        $('img.nav-next').click(jumpToNextItem);
                                });
                        } else {
                                //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(jumpToPrevItem);
                                        $('img.nav-next').click(jumpToNextItem);
                                });
                        }

                        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() {
                        if(++iterator==j_frames.length) {iterator=0;}
                        showItem(iterator);
                };
                function showPrevItem() {
                        if(--iterator<0) {iterator = j_frames.length-1;}
                        showItem(iterator);
                };
                function jumpToNextItem() {
                        $(document).stopTime("transition");
                        if(++iterator==j_frames.length) {iterator=0;}
                        showItem(iterator);
                        $(document).everyTime(opts.transition_interval,"transition",function(){
                                showNextItem();
                        });
                };
                function jumpToPrevItem() {
                        $(document).stopTime("transition");
                        if(--iterator<0) {iterator = j_frames.length-1;}
                        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 fPos = getPos(f[0]);
                                var fLeft = fPos.left;
                                var fTop = fPos.top;

                                return {'left':left-fLeft,'top':top-fTop};
                        }
                };

/************************************************/
/*        Main Plugin Code                                                        */
/************************************************/
                return this.each(function() {
                        f = $(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
                        f.css('visibility','hidden');

                        //Assign elements to variables for reuse
                        j_filmstrip = $('.filmstrip',f);
                        j_frames = $('li',j_filmstrip);
                        j_panels = $('.panel',f);

                        id = f.attr('id');

                        //Number of frames in filmstrip
                        item_count = j_frames.length;
                        //Number of frames that can display within the screen's width
                        //84 = width of block for navigation button * 2
                        //5 = minimum frame margin
                        strip_size = Math.floor((opts.panel_width-84)/(opts.frame_width+5));


                        /************************************************/
                        /*        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 = opts.panel_width;
                                        //Height of gallery block = screen + filmstrip + captions (optional)
                                        gallery_height = opts.panel_height+opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top);
                                        //Space to put between filmstrip frames
                                        //84 = width of block for navigation button * 2
                                        frame_margin = Math.min((opts.panel_width-84-(opts.frame_width*strip_size))/(strip_size+1),10);
                                        //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));}
                                        strip_margin = 0;
                                        //Width of filmstrip wrapper (to hide overflow)
                                        wrapper_width = ((strip_size*opts.frame_width)+((strip_size-1)*frame_margin));


                        /************************************************/
                        /*        Modify/Augment DOM elements                                        */
                        /************************************************/
                                        //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 = $('li',j_filmstrip);
                                        }
                                        //If there are panel captions, add overlay divs
                                        if($('.panel-overlay').length>0) {j_panels.append('<div class="overlay"></div>');}

                                        //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(){
                                                        $(this).find('.caption').html($(this).find('img').attr('title'));
                                                });
                                        }

                                        //Add navigation buttons
                                        $('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.png').appendTo(f).css({
                                                'position':'absolute',
                                                'cursor':'pointer',
                                                'top':opts.panel_height+frame_margin_top+((opts.frame_height-22)/2)+'px',
                                                'right':'10px'
                                        }).click(jumpToNextItem);
                                        $('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.png').appendTo(f).css({
                                                'position':'absolute',
                                                'cursor':'pointer',
                                                'top':opts.panel_height+frame_margin_top+((opts.frame_height-22)/2)+'px',
                                                'left':'10px'
                                        }).click(jumpToPrevItem);


                        /************************************************/
                        /*        Apply CSS Styles                                                        */
                        /************************************************/
                                        f.css({
                                                'position':'relative',
                                                'margin':'0',
                                                'background':opts.background_color,
                                                'border':opts.border,
                                                'width':gallery_width+'px',
                                                'height':gallery_height+'px'
                                        });
                                        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':'0px',
                                                'left':'0px',
                                                'background':'white',
                                                'display':'none'
                                        });
                                        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',f).css({
                                                'position':'absolute',
                                                'top':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',f).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'
                                        });
                                        $('.panel-overlay',j_panels).css({
                                                'position':'absolute',
                                                'zIndex':'999',
                                                'width':(opts.panel_width-20)+'px',
                                                'height':opts.overlay_height+'px',
                                                'bottom':'0',
                                                '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',
                                                'bottom':'0',
                                                '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'
                                        });

                        /************************************************/
                        /*        Create Pointer element                                                */
                        /************************************************/
                                        var pointer = $('<div></div>');
                                        pointer.attr('id','pointer').appendTo(f).css({
                                                 'position':'absolute',
                                                 'zIndex':'1000',
                                                 'cursor':'pointer',
                                                 'top':getPos(j_frames[0]).top-2+'px',
                                                 'left':getPos(j_frames[0]).left-2+'px',
                                                 'height':opts.frame_height-4+'px',
                                                 'width':opts.frame_width-4+'px',
                                                 'border':'4px solid '+(opts.nav_theme=='dark'?'black':'white')
                                        });
                                        j_pointer = $('#pointer',f);
                                        var pointerArrow = $('<img />');
                                        pointerArrow.attr('src',img_path+opts.nav_theme+'/pointer.gif').appendTo($('#pointer')).css({
                                                'position':'absolute',
                                                'zIndex':'1001',
                                                'top':'-14px',
                                                'left':((opts.frame_width/2)-10)+'px'
                                        });

                        /************************************************/
                        /*        Add events to various elements                                */
                        /************************************************/
                                        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();
                                                                });
                                                        });
                                                }
                                        });
                                        if(opts.pause_on_hover) {
                                                $('.panel',f).mouseover(function(){
                                                        $(document).oneTime(500,"animation_pause",function(){
                                                                $(document).stopTime("transition");
                                                                paused=true;
                                                        });
                                                }).mouseout(function(){
                                                        $(document).stopTime("animation_pause");
                                                        if(paused) {
                                                                $(document).everyTime(opts.transition_interval,"transition",function(){
                                                                        showNextItem();
                                                                });
                                                                paused = false;
                                                        }
                                                });
                                        }


                        /************************************************/
                        /*        Initiate Automated Animation                                */
                        /************************************************/
                                        //Show the first panel
                                        $('.panel',f).eq(0).show();

                                        //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');}
                                                });
                                        }
                                        //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
                                        f.css('visibility','visible');
                });
        };

        $.fn.galleryView.defaults = {
                panel_width:         400,
                panel_height:        300,
                frame_width:         80,
                frame_height:        80,
                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',
                show_captions:       false,
                fade_panels:         true,
                pause_on_hover:      false
        };
})(jQuery);