/**************************************************************************
 * Name:   EmbedPicasaGallery
 * Author: Tobias Oetiker <tobi@oetiker.ch>
 * Date:   2009/09/10
 * Demo:   http://tobi.oetiker.ch/photo/

 * $Id: jquery.EmbedPicasaGallery.js 193 2009-09-14 19:44:32Z oetiker $
 **************************************************************************/
/**************************************************************************
 Description:
 
 This little script asks picasa web for a list of albums and for a list
 of pictures in the album. It then emits a series of <div class="pic-thumb"/>
 elements containing thumbnail images. The divs are inserted inside the element
 marked with a particular id. Clicking on an album will display thumbnails of the
 images in the album and clicking on a thumbnail will show the image itself
 using slimbox.
 
 The script itself uses jQuery (http://www.jquery.org) and slimbox2
 (http://www.digitalia.be/software/slimbox2) to work. So you have to load
 these two guys before loading the gallery script. You can load them in the
 header or the body of the document, this does not matter.
 
  <script type="text/javascript" src="js/jquery.js"></script>
  <link rel="stylesheet" href="css/slimbox2.css" type="text/css" media="screen" />
  <script type="application/javascript" src="slimbox2.js"></script>
  <script type="text/javascript" src="js/jquery.EmbedPicasaGallery.js"></script>

 Once loaded, call the picasaGallery function. This activates the
 code. With the id argument you tell it, where to put the gallery.

  <script type="text/javascript">
  jQuery(document).ready(function() {
   jQuery("#images").EmbedPicasaGallery('oetiker',{
      matcher:            /./,        // string or regexp to match album title
      size:               '72'        // thumbnail size (32, 48, 64, 72, 144, 160)
      msg_loading_list :  'Loading list from PicasaWeb',
      msg_loading_album : 'Loading album from PicasaWeb',
      msg_back :          'Back',
      album_title_tag: '<h2/>'
   });
  });
  </script>

 Finally inside the document, add a div tag with the id set to the name
 chosen above.
 
 <span id="images"></div>

 To have the elements show up horyzontally stacked and not vertiaclly use css 

**********************************************************************************/

(function($) {
    // setup a namespace for us
    var nsp = 'EmbedPicasaGallery';

    // Public Variables and Methods
    $[nsp] = {
        defaultOptions: {
            matcher : RegExp('.+'),
            size    : 72,
            msg_loading_list : 'Loading list from PicasaWeb',
            msg_loading_album : 'Loading album from PicasaWeb',
            msg_back : 'Back',
            album_title_tag: '<h2/>'
        },        
    };

    // Private Variables and Functions in the _ object
    // note that this will refer to _ unless you
    // call using the call or apply methods
    var _ = {
    };

    $.fn[nsp] = function(user,opts) {
        var localOpts = $.extend( 
            {}, // start with an empty map
            $[nsp].defaultOptions, // add defaults
            opts // add options
        );
        var Cache = {};

        function showOverview() {
            if ( Cache.__overview ){
                Cache.__overview.show();
                return;
            }
            var $this = $(this);
            if ( ! Cache.__original ){
                Cache.__original = $this.clone(true);
            }

            $this.after($('<div/>').css('clear','left'));

            var meta_opts = localOpts;
            if ($.meta){
                meta_opts = $.extend({}, localOpts, $this.data());
            }
 
            $this.text(meta_opts.msg_loading_list);
            var albumCount = 0;
            function appendImage(i,item){
                var title = item.media$group.media$title.$t;
                if (title.match(meta_opts.matcher)){
                    albumCount++;
                    $this.append( $("<div/>")
                        .css({
                            float: 'left',
                            'margin-right': '10px',
                            'margin-bottom': '10px'
                        })
                        .click(function () {
                           showAlbum($this,meta_opts,item.gphoto$id.$t,title);
                        })
                        .hover(
                            function () { $(this).css("cursor","pointer")},
                            function () { $(this).css("cursor","default")}
                        )
                        .append( $("<img/>").attr("src", item.media$group.media$thumbnail[0].url) )
                        .append(
                            $('<div/>')
                            .css({
                                'font-size': '10px'
                            })
                            .text(title)
                            .width( meta_opts.size )
                        )
                    );
                };
            }
            
            function renderAlbumList(data){
                $this.empty();
                $.each(data.feed.entry,appendImage);                
                if (albumCount == 1){
                    $this.children().eq(0).click();
                    return;
                }
                var maxHeight = 0;
                $this.children()    
                    .each(function(){var h = $('div',$(this)).outerHeight(); if (h > maxHeight){maxHeight = h}})
                    .each(function(){$(this).height(maxHeight+meta_opts.size+5)});
               
                Cache.__overview = $this;
            }

            $.getJSON('http://picasaweb.google.com/data/feed/api/user/' 
                + user + '?kind=album&access=public&alt=json-in-script&thumbsize=' + meta_opts.size + 'c&callback=?',
                renderAlbumList
            );
        };

        function showAlbum($el,meta_opts,album,title){
            $el.hide();
            if ( Cache[album] ){
               Cache[album].show();
               return;
            };
            var $album = Cache.__original.clone(true);
            $el.after($album);
            $album.text(meta_opts.msg_loading_album);

            function appendImage(i,item){
               var title = item.media$group.media$title.$t;
               var a = $("<a/>")
                   .attr("href",item.content.src)
                   .attr("title",title)
                   .append(
                        $("<img/>")
                        .attr("src", item.media$group.media$thumbnail[0].url)
                        .css({'border-width': '0px',
                              width : meta_opts.size + 'px',
                              height : meta_opts.size + 'px' 
                         })
                    );
                $album.append(
                    $("<div/>")
                    .css({
                       float: 'left',
                       'margin-right': '10px',
                       'margin-bottom': '10px'
                    })
                    .append(a)
                );
            }

            function renderAlbum(data){
                $album.empty();
                $album.append($(meta_opts.album_title_tag).text(title))

                if (Cache.__overview){
                    $album.append($("<div/>")
                       .attr("class","pic-thumb")
                       .css({'border-width': '0px',
                            float : 'left',
                           'margin-right': '10px',
                           'margin-bottom': '10px',
                            width : meta_opts.size + 'px',
                            height : meta_opts.size + 'px' 
                       })
                       .append($("<div/>")
                           .html('<br/>'+meta_opts.msg_back)
                           .click(function(){$album.hide();showOverview()})
                           .css({'border-style':'outset',
                                 'border-width':'1px',
                                 'text-align'  :'center',
                                 'width'       : (meta_opts.size - 2) + 'px',
                                 'height'      : (meta_opts.size - 2) + 'px'
                           })
                       )
                    );
                }
                $.each(data.feed.entry,appendImage);

                function linkMapper(el){
                    return [
                        el.href,
                        '<a href="'+el.href+'">'+el.title+'</a>'
                    ]
                }

                if ($.fn.slimbox){
                    $('a',$album).slimbox({},linkMapper);
                }

               Cache[album] = $album;
           }

           $.getJSON('http://picasaweb.google.com/data/feed/api/user/' 
                + user + '/albumid/' 
                + album + '?kind=photo&access=public&alt=json-in-script&thumbsize='+meta_opts.size+'c&imgmax=800&callback=?',
                renderAlbum
           );
        };

        return this.each(showOverview);
    };
})(jQuery);