/*

	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.png').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.png').appendTo(j_gallery).css({
                'position':'absolute',
                'zIndex':'1100',
                'cursor':'pointer',
                'top':((opts.panel_height-22)/2)+'px',
                'left':'10px',
                'display':'none'
            }).click(showPrevItem);

        }
        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',
            'background-color':'black',
            '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':'11px'
        });
        $('.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 = $('<img />');
            pointerArrow.attr('src',img_path+opts.nav_theme+'/pointer'+(opts.filmstrip_position=='top'?'-down':'')+'.png').appendTo($('#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.png').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.png').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: 9000,
    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);