/*

	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' : '#2b739a') : '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: 52,
    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);