/*
* Treeview 1.4 - jQuery plugin to hide and show branches of a tree
* 
* http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
* http://docs.jquery.com/Plugins/Treeview
*
* Copyright (c) 2007 Jörn Zaefferer
*
* Dual licensed under the MIT and GPL licenses:
*   http://www.opensource.org/licenses/mit-license.php
*   http://www.gnu.org/licenses/gpl.html
*
* Revision: $Id: jquery.treeview.js 4684 2008-02-07 19:08:06Z joern.zaefferer $
*
*/

;(function($) {
  
  $.extend($.fn, {
    swapClass: function(c1, c2) {
      var c1Elements = this.filter('.' + c1);
      this.filter('.' + c2).removeClass(c2).addClass(c1);
      c1Elements.removeClass(c1).addClass(c2);
      return this;
    },
    replaceClass: function(c1, c2) {
      return this.filter('.' + c1).removeClass(c1).addClass(c2).end();
    },
    hoverClass: function(className) {
      className = className || "hover";
      return this.hover(function() {
	$(this).addClass(className);
      }, function() {
	$(this).removeClass(className);
      });
    },
    heightToggle: function(animated, callback) {
      animated ?
      this.animate({ height: "toggle" }, animated, callback) :
      this.each(function(){
	jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]();
	if(callback)
	  callback.apply(this, arguments);
      });
    },
		heightHide: function(animated, callback) {
		  if (animated) {
		    this.animate({ height: "hide" }, animated, callback);
		  } else {
		    this.hide();
		    if (callback)
		      this.each(callback);				
		  }
		},
		prepareBranches: function(settings) {
		  if (!settings.prerendered) {
		    // mark last tree items
		    this.filter(":last-child:not(ul)").addClass(CLASSES.last);
		    // collapse whole tree, or only those marked as closed, anyway except those marked as open
		    this.filter((settings.collapsed ? "" : "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide();
		  }
		  // return all items with sublists
		  return this.filter(":has(>ul)");
		},
		applyClasses: function(settings, toggler) {
		
		  this.filter(":has(>ul):not(:has(>a))").find(">span").click(function(event) {
		    toggler.apply($(this).next());
		  }).add( $("a", this) ).hoverClass();
		  
		  if (!settings.prerendered) {
		    // handle closed ones first
		    this.filter(":has(>ul:hidden)")
		    .addClass(CLASSES.expandable)
		    .replaceClass(CLASSES.last, CLASSES.lastExpandable);
		    
		    // handle open ones
		    this.not(":has(>ul:hidden)")
		    .addClass(CLASSES.collapsable)
		    .replaceClass(CLASSES.last, CLASSES.lastCollapsable);
		    
		    // create hitarea
		    this.prepend("<div class=\"" + CLASSES.hitarea + "\"/>").find("div." + CLASSES.hitarea).each(function() {
		      var classes = "";
		      $.each($(this).parent().attr("class").split(" "), function() {
			classes += this + "-hitarea ";
		      });
		      $(this).addClass( classes );
		    });
		  }
		  
		  // apply event to hitarea
		  this.find("div." + CLASSES.hitarea).click( toggler );
		},
		treeview: function(settings) {
		  
		  if (!settings.cookieId) {
		    settings = $.extend({
		      cookieId: "treeview"
		    }, settings);
		  }
		  
		  if (settings.add) {
		    return this.trigger("add", [settings.add]);
		  }
		  
		  if ( settings.toggle ) {
		    var callback = settings.toggle;
		    settings.toggle = function() {
		      return callback.apply($(this).parent()[0], arguments);
		    };
		  }
		  
		  // factory for treecontroller
		  function treeController(tree, control) {
		    // factory for click handlers
		    function handler(filter) {
		      return function() {
			// reuse toggle event handler, applying the elements to toggle
			// start searching for all hitareas
			toggler.apply( $("div." + CLASSES.hitarea, tree).filter(function() {
			  // for plain toggle, no filter is provided, otherwise we need to check the parent element
			  return filter ? $(this).parent("." + filter).length : true;
			}) );
			return false;
		      };
		    }
		    // click on first element to collapse tree
		    $("a:eq(0)", control).click( handler(CLASSES.collapsable) );
		    // click on second to expand tree
		    $("a:eq(1)", control).click( handler(CLASSES.expandable) );
		    // click on third to toggle tree
		    $("a:eq(2)", control).click( handler() ); 
		  }
		  
		  // handle toggle event
		  function toggler() {
		    $(this)
		    .parent()
		    // swap classes for hitarea
		    .find(">.hitarea")
		    .swapClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
		    .swapClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea )
		    .end()
		    // swap classes for parent li
		    .swapClass( CLASSES.collapsable, CLASSES.expandable )
		    .swapClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
		    // find child lists
		    .find( ">ul" )
		    // toggle them
		    .heightToggle( settings.animated, settings.toggle );
		    if ( settings.unique ) {
		      $(this).parent()
		      .siblings()
		      // swap classes for hitarea
		      .find(">.hitarea")
		      .replaceClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
		      .replaceClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea )
		      .end()
		      .replaceClass( CLASSES.collapsable, CLASSES.expandable )
		      .replaceClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
		      .find( ">ul" )
		      .heightHide( settings.animated, settings.toggle );
		    }
		  }
		  
		  function serialize() {
		    function binary(arg) {
		      return arg ? 1 : 0;
		    }
		    var data = [];
		    branches.each(function(i, e) {
		      data[i] = $(e).is(":has(>ul:visible)") ? 1 : 0;
		    });
		    $.cookie(settings.cookieId, data.join("") );
		  }
		  
		  function deserialize() {
		    var stored = $.cookie(settings.cookieId);
		    if ( stored ) {
		      var data = stored.split("");
		      branches.each(function(i, e) {
			$(e).find(">ul")[ parseInt(data[i]) ? "show" : "hide" ]();
		      });
		    }
		  }
		  
		  // add treeview class to activate styles
		  this.addClass("treeview");
		  
		  // prepare branches and find all tree items with child lists
		  var branches = this.find("li").prepareBranches(settings);
		  
		  switch(settings.persist) {
		    case "cookie":
		      var toggleCallback = settings.toggle;
		      settings.toggle = function() {
			serialize();
			if (toggleCallback) {
			  toggleCallback.apply(this, arguments);
			}
		      };
		      deserialize();
		      break;
		    case "location":
		      var current = this.find("a").filter(function() { return this.href.toLowerCase() == location.href.toLowerCase(); });
		      if ( current.length ) {
			current.addClass("selected").parents("ul, li").add( current.next() ).show();
		      }
		      break;
		  }
		  
		  branches.applyClasses(settings, toggler);
		  
		  // if control option is set, create the treecontroller and show it
		  if ( settings.control ) {
		    treeController(this, settings.control);
		    $(settings.control).show();
		  }
		  
		  return this.bind("add", function(event, branches) {
		    $(branches).prev()
		    .removeClass(CLASSES.last)
		    .removeClass(CLASSES.lastCollapsable)
		    .removeClass(CLASSES.lastExpandable)
		    .find(">.hitarea")
		    .removeClass(CLASSES.lastCollapsableHitarea)
		    .removeClass(CLASSES.lastExpandableHitarea);
		    $(branches).find("li").andSelf().prepareBranches(settings).applyClasses(settings, toggler);
		  });
		}
  });
  
  // classes used by the plugin
  // need to be styled via external stylesheet, see first example
  var CLASSES = $.fn.treeview.classes = {
    open: "open",
    closed: "closed",
    expandable: "expandable",
    expandableHitarea: "expandable-hitarea",
    lastExpandableHitarea: "lastExpandable-hitarea",
    collapsable: "collapsable",
    collapsableHitarea: "collapsable-hitarea",
    lastCollapsableHitarea: "lastCollapsable-hitarea",
    lastCollapsable: "lastCollapsable",
    lastExpandable: "lastExpandable",
    last: "last",
    hitarea: "hitarea"
  };
  
  // provide backwards compability
  $.fn.Treeview = $.fn.treeview;
  
})(jQuery);