/*

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);

                $('<img />').addClass('nav-overlay').attr('src', img_path + opts.nav_theme + '/panel-nav-next.png').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.png').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',
                '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 = $('<img />');
                pointerArrow.attr('src', img_path + opts.nav_theme + '/pointer' + (opts.filmstrip_position == 'top' ? '-down' : '') + '.png').appendTo($('#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: 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);