/*
Script: mootree.js
	My Object Oriented Tree
	- Developed by Rasmus Schultz, <http://www.mindplay.dk>
	- Tested with MooTools release 1.2, under Firefox 2, Opera 9 and Internet Explorer 6 and 7.

License:
	MIT-style license.

Credits:
	Inspired by:
	- WebFX xTree, <http://webfx.eae.net/dhtml/xtree/>
	- Destroydrop dTree, <http://www.destroydrop.com/javascripts/tree/>

Changes:

	rev.12:
	- load() only worked once on the same node, fixed.
	- the script would sometimes try to get 'R' from the server, fixed.
	- the 'load' attribute is now supported in XML files (see example_5.html).

	rev.13:
	- enable() and disable() added - the adopt() and load() methods use these to improve performance by minimizing the number of visual updates.

	rev.14:
	- toggle() was using enable() and disable() which actually caused it to do extra work - fixed.

	rev.15:
	- adopt() now picks up 'href', 'target', 'title' and 'name' attributes of the a-tag, and stores them in the data object.
	- adopt() now picks up additional constructor arguments from embedded comments, e.g. icons, colors, etc.
	- documentation now generates properly with NaturalDocs, <http://www.naturaldocs.org/>

	rev.16:
	- onClick events added to MooTreeControl and MooTreeNode
	- nodes can now have id's - <MooTreeControl.get> method can be used to find a node with a given id

	rev.17:
	- changed icon rendering to use innerHTML, making the control faster (and code size slightly smaller).

	rev.18:
	- migrated to MooTools 1.2 (previous versions no longer supported)

*/

var MooTreeIcon = ['I','L','Lminus','Lplus','Rminus','Rplus','T','Tminus','Tplus','_closed','_doc','_open','minus','plus'];

/*
Class: MooTreeControl
	This class implements a tree control.

Properties:
	root - returns the root <MooTreeNode> object.
	selected - returns the currently selected <MooTreeNode> object, or null if nothing is currently selected.

Events:
	onExpand - called when a node is expanded or collapsed: function(node, state) - where node is the <MooTreeNode> object that fired the event, and state is a boolean meaning true:expanded or false:collapsed.
	onSelect - called when a node is selected or deselected: function(node, state) - where node is the <MooTreeNode> object that fired the event, and state is a boolean meaning true:selected or false:deselected.
	onClick - called when a node is clicked: function(node) - where node is the <MooTreeNode> object that fired the event.

Parameters:
	The constructor takes two object parameters: config and options.
	The first, config, contains global settings for the tree control - you can use the configuration options listed below.
	The second, options, should contain options for the <MooTreeNode> constructor - please refer to the options listed in the <MooTreeNode> documentation.

Config:
	div - a string representing the div Element inside which to build the tree control.
	mode - optional string, defaults to 'files' - specifies default icon behavior. In 'files' mode, empty nodes have a document icon - whereas, in 'folders' mode, all nodes are displayed as folders (a'la explorer).
	grid - boolean, defaults to false. If set to true, a grid is drawn to outline the structure of the tree.

	theme - string, optional, defaults to 'mootree.gif' - specifies the 'theme' GIF to use.

	loader - optional, an options object for the <MooTreeNode> constructor - defaults to {icon:'mootree_loader.gif', text:'Loading...', color:'a0a0a0'}

	onExpand - optional function (see Events above)
	onSelect - optional function (see Events above)

*/

var MooTreeControl = new Class({

	initialize: function(config, options) {

		options.control = this;               // make sure our new MooTreeNode knows who it's owner control is
		options.div = config.div;             // tells the root node which div to insert itself into
		this.root = new MooTreeNode(options); // create the root node of this tree control

		this.index = new Object();            // used by the get() method

		this.enabled = true;                  // enable visual updates of the control

		this.theme = config.theme || 'mootree.gif';

		this.loader = config.loader || {icon:'mootree_loader.gif', text:'Loading...', color:'#a0a0a0'};

		this.selected = null;                 // set the currently selected node to nothing
		this.mode = config.mode;              // mode can be "folders" or "files", and affects the default icons
		this.grid = config.grid;              // grid can be turned on (true) or off (false)

		this.onExpand = config.onExpand || new Function(); // called when any node in the tree is expanded/collapsed
		this.onSelect = config.onSelect || new Function(); // called when any node in the tree is selected/deselected
		this.onClick = config.onClick || new Function(); // called when any node in the tree is clicked

		this.root.update(true);

	},

	/*
	Property: insert
		Creates a new node under the root node of this tree.

	Parameters:
		options - an object containing the same options available to the <MooTreeNode> constructor.

	Returns:
		A new <MooTreeNode> instance.
	*/

	insert: function(options) {
		options.control = this;
		return this.root.insert(options);
	},

	/*
	Property: select
		Sets the currently selected node.
		This is called by <MooTreeNode> when a node is selected (e.g. by clicking it's title with the mouse).

	Parameters:
		node - the <MooTreeNode> object to select.
	*/

	select: function(node) {
		this.onClick(node); node.onClick(); // fire click events
		if (this.selected === node) return; // already selected
		if (this.selected) {
			// deselect previously selected node:
			this.selected.select(false);
			this.onSelect(this.selected, false);
		}
		// select new node:
		this.selected = node;
		node.select(true);
		this.onSelect(node, true);
	},

	/*
	Property: expand
		Expands the entire tree, recursively.
	*/

	expand: function() {
		this.root.toggle(true, true);
	},

	/*
	Property: collapse
		Collapses the entire tree, recursively.
	*/

	collapse: function() {
		this.root.toggle(true, false);
	},

	/*
	Property: get
		Retrieves the node with the given id - or null, if no node with the given id exists.

	Parameters:
		id - a string, the id of the node you wish to retrieve.

	Note:
		Node id can be assigned via the <MooTreeNode> constructor, e.g. using the <MooTreeNode.insert> method.
	*/

	get: function(id) {
		return this.index[id] || null;
	},

	/*
	Property: adopt
		Adopts a structure of nested ul/li/a elements as tree nodes, then removes the original elements.

	Parameters:
		id - a string representing the ul element to be adopted, or an element reference.
		parentNode - optional, a <MooTreeNode> object under which to import the specified ul element. Defaults to the root node of the parent control.

	Note:
		The ul/li structure must be properly nested, and each li-element must contain one a-element, e.g.:

		><ul id="mytree">
		>  <li><a href="test.html">Item One</a></li>
		>  <li><a href="test.html">Item Two</a>
		>    <ul>
		>      <li><a href="test.html">Item Two Point One</a></li>
		>      <li><a href="test.html">Item Two Point Two</a></li>
		>    </ul>
		>  </li>
		>  <li><a href="test.html"><!-- icon:_doc; color:#ff0000 -->Item Three</a></li>
		></ul>

		The "href", "target", "title" and "name" attributes of the a-tags are picked up and stored in the
		data property of the node.

		CSS-style comments inside a-tags are parsed, and treated as arguments for <MooTreeNode> constructor,
		e.g. "icon", "openicon", "color", etc.
	*/

	adopt: function(id, parentNode) {
		if (parentNode === undefined) parentNode = this.root;
		this.disable();
		this._adopt(id, parentNode);
		parentNode.update(true);
		$(id).destroy();
		this.enable();
	},

	_adopt: function(id, parentNode) {
		/* adopts a structure of ul/li elements into this tree */
		e = $(id);
		var i=0, c = e.getChildren();
		for (i=0; i<c.length; i++) {
			if (c[i].nodeName == 'LI') {
				var con={text:''}, comment='', node=null, subul=null;
				var n=0, z=0, se=null, s = c[i].getChildren();
				for (n=0; n<s.length; n++) {
					switch (s[n].nodeName) {
						case 'A':
							for (z=0; z<s[n].childNodes.length; z++) {
								se = s[n].childNodes[z];
								switch (se.nodeName) {
									case '#text': con.text += se.nodeValue; break;
									case '#comment': comment += se.nodeValue; break;
								}
							}
							con.data = s[n].getProperties('href','target','title','name');
						break;
						case 'UL':
							subul = s[n];
						break;
					}
				}
				if (con.label != '') {
					con.data.url = con.data['href']; // (for backwards compatibility)
					if (comment != '') {
						var bits = comment.split(';');
						for (z=0; z<bits.length; z++) {
							var pcs = bits[z].trim().split(':');
							if (pcs.length == 2) con[pcs[0].trim()] = pcs[1].trim();
						}
					}
					if ($chk(c[i].id)) {
						con.id = 'node_'+c[i].id;
					}
					node = parentNode.insert(con);
					if (subul) this._adopt(subul, node);
				}
			}
		}
	},

	/*
	Property: disable
		Call this to temporarily disable visual updates -- if you need to insert/remove many nodes
		at a time, many visual updates would normally occur. By temporarily disabling the control,
		these visual updates will be skipped.

		When you're done making changes, call <MooTreeControl.enable> to turn on visual updates
		again, and automatically repaint all nodes that were changed.
	*/

	disable: function() {
		this.enabled = false;
	},

	/*
	Property: enable
		Enables visual updates again after a call to <MooTreeControl.disable>
	*/

	enable: function() {
		this.enabled = true;
		this.root.update(true, true);
	}

});

/*
Class: MooTreeNode
	This class implements the functionality of a single node in a <MooTreeControl>.

Note:
	You should not manually create objects of this class -- rather, you should use
	<MooTreeControl.insert> to create nodes in the root of the tree, and then use
	the similar function <MooTreeNode.insert> to create subnodes.

	Both insert methods have a similar syntax, and both return the newly created
	<MooTreeNode> object.

Parameters:
	options - an object. See options below.

Options:
	text - this is the displayed text of the node, and as such as is the only required parameter.
	id - string, optional - if specified, must be a unique node identifier. Nodes with id can be retrieved using the <MooTreeControl.get> method.
	color - string, optional - if specified, must be a six-digit hexadecimal RGB color code.

	open - boolean value, defaults to false. Use true if you want the node open from the start.

	icon - use this to customize the icon of the node. The following predefined values may be used: '_open', '_closed' and '_doc'. Alternatively, specify the URL of a GIF or PNG image to use - this should be exactly 18x18 pixels in size. If you have a strip of images, you can specify an image number (e.g. 'my_icons.gif#4' for icon number 4).
	openicon - use this to customize the icon of the node when it's open.

	data - an object containing whatever data you wish to associate with this node (such as an url and/or an id, etc.)

Events:
	onExpand - called when the node is expanded or collapsed: function(state) - where state is a boolean meaning true:expanded or false:collapsed.
	onSelect - called when the node is selected or deselected: function(state) - where state is a boolean meaning true:selected or false:deselected.
	onClick - called when the node is clicked (no arguments).
*/

var MooTreeNode = new Class({

	initialize: function(options) {

		this.text = options.text;       // the text displayed by this node
		this.id = options.id || null;   // the node's unique id
		this.nodes = new Array();       // subnodes nested beneath this node (MooTreeNode objects)
		this.parent = null;             // this node's parent node (another MooTreeNode object)
		this.last = true;               // a flag telling whether this node is the last (bottom) node of it's parent
		this.control = options.control; // owner control of this node's tree
		this.selected = false;          // a flag telling whether this node is the currently selected node in it's tree

		this.color = options.color || null; // text color of this node

		this.data = options.data || {}; // optional object containing whatever data you wish to associate with the node (typically an url or an id)

		this.onExpand = options.onExpand || new Function(); // called when the individual node is expanded/collapsed
		this.onSelect = options.onSelect || new Function(); // called when the individual node is selected/deselected
		this.onClick = options.onClick || new Function(); // called when the individual node is clicked

		this.open = options.open ? true : false; // flag: node open or closed?

		this.icon = options.icon;
		this.openicon = options.openicon || this.icon;

		// add the node to the control's node index:
		if (this.id) this.control.index[this.id] = this;

		// create the necessary divs:
		this.div = {
			main: new Element('div').addClass('mooTree_node'),
			indent: new Element('div'),
			gadget: new Element('div'),
			icon: new Element('div'),
			text: new Element('div').addClass('mooTree_text'),
			sub: new Element('div')
		}

		// put the other divs under the main div:
		this.div.main.adopt(this.div.indent);
		this.div.main.adopt(this.div.gadget);
		this.div.main.adopt(this.div.icon);
		this.div.main.adopt(this.div.text);

		// put the main and sub divs in the specified parent div:
		$(options.div).adopt(this.div.main);
		$(options.div).adopt(this.div.sub);

		// attach event handler to gadget:
		this.div.gadget._node = this;
		this.div.gadget.onclick = this.div.gadget.ondblclick = function() {
			this._node.toggle();
		}

		// attach event handler to icon/text:
		this.div.icon._node = this.div.text._node = this;
		this.div.icon.onclick = this.div.icon.ondblclick = this.div.text.onclick = this.div.text.ondblclick = function() {
			this._node.control.select(this._node);
		}

	},

	/*
	Property: insert
		Creates a new node, nested inside this one.

	Parameters:
		options - an object containing the same options available to the <MooTreeNode> constructor.

	Returns:
		A new <MooTreeNode> instance.
	*/

	insert: function(options) {

		// set the parent div and create the node:
		options.div = this.div.sub;
		options.control = this.control;
		var node = new MooTreeNode(options);

		// set the new node's parent:
		node.parent = this;

		// mark this node's last node as no longer being the last, then add the new last node:
		var n = this.nodes;
		if (n.length) n[n.length-1].last = false;
		n.push(node);

		// repaint the new node:
		node.update();

		// repaint the new node's parent (this node):
		if (n.length == 1) this.update();

		// recursively repaint the new node's previous sibling node:
		if (n.length > 1) n[n.length-2].update(true);

		return node;

	},

	/*
	Property: remove
		Removes this node, and all of it's child nodes. If you want to remove all the childnodes without removing the node itself, use <MooTreeNode.clear>
	*/

	remove: function() {
		var p = this.parent;
		this._remove();
		p.update(true);
	},

	_remove: function() {

		// recursively remove this node's subnodes:
		var n = this.nodes;
		while (n.length) n[n.length-1]._remove();

		// remove the node id from the control's index:
		delete this.control.index[this.id];

		// remove this node's divs:
		this.div.main.destroy();
		this.div.sub.destroy();

		if (this.parent) {

			// remove this node from the parent's collection of nodes:
			var p = this.parent.nodes;
			p.erase(this);

			// in case we removed the parent's last node, flag it's current last node as being the last:
			if (p.length) p[p.length-1].last = true;

		}

	},

	/*
	Property: clear
		Removes all child nodes under this node, without removing the node itself.
		To remove all nodes including this one, use <MooTreeNode.remove>
	*/

	clear: function() {
		this.control.disable();
		while (this.nodes.length) this.nodes[this.nodes.length-1].remove();
		this.control.enable();
	},

	/*
	Property: update
		Update the tree node's visual appearance.

	Parameters:
		recursive - boolean, defaults to false. If true, recursively updates all nodes beneath this one.
		invalidated - boolean, defaults to false. If true, updates only nodes that have been invalidated while the control has been disabled.
	*/

	update: function(recursive, invalidated) {

		var draw = true;

		if (!this.control.enabled) {
			// control is currently disabled, so we don't do any visual updates
			this.invalidated = true;
			draw = false;
		}

		if (invalidated) {
			if (!this.invalidated) {
				draw = false; // this one is still valid, don't draw
			} else {
				this.invalidated = false; // we're drawing this item now
			}
		}

		if (draw) {

			var x;

			// make selected, or not:
			this.div.main.className = 'mooTree_node' + (this.selected ? ' mooTree_selected' : '');

			// update indentations:
			var p = this, i = '';
			while (p.parent) {
				p = p.parent;
				i = this.getImg(p.last || !this.control.grid ? '' : 'I') + i;
			}
			this.div.indent.innerHTML = i;

			// update the text:
			x = this.div.text;
			x.empty();
			x.appendText(this.text);
			if (this.color) x.style.color = this.color;

			// update the icon:
			this.div.icon.innerHTML = this.getImg( this.nodes.length ? ( this.open ? (this.openicon || this.icon || '_open') : (this.icon || '_closed') ) : ( this.icon || (this.control.mode == 'folders' ? '_closed' : '_doc') ) );

			// update the plus/minus gadget:
			this.div.gadget.innerHTML = this.getImg( ( this.control.grid ? ( this.control.root == this ? (this.nodes.length ? 'R' : '') : (this.last?'L':'T') ) : '') + (this.nodes.length ? (this.open?'minus':'plus') : '') );

			// show/hide subnodes:
			this.div.sub.style.display = this.open ? 'block' : 'none';

		}

		// if recursively updating, update all child nodes:
		if (recursive) this.nodes.forEach( function(node) {
			node.update(true, invalidated);
		});

	},

	/*
	Property: getImg
		Creates a new image, in the form of HTML for a DIV element with appropriate style.
		You should not need to manually call this method. (though if for some reason you want to, you can)

	Parameters:
		name - the name of new image to create, defined by <MooTreeIcon> or located in an external file.

	Returns:
		The HTML for a new div Element.
	*/

	getImg: function(name) {

		var html = '<div class="mooTree_img"';

		if (name != '') {
			var img = this.control.theme;
			var i = MooTreeIcon.indexOf(name);
			if (i == -1) {
				// custom (external) icon:
				var x = name.split('#');
				img = x[0];
				i = (x.length == 2 ? parseInt(x[1])-1 : 0);
			}
			html += ' style="background-image:url(' + img + '); background-position:-' + (i*18) + 'px 0px;"';
		}

		html += "></div>";

		return html;

	},

	/*
	Property: toggle
		By default (with no arguments) this function toggles the node between expanded/collapsed.
		Can also be used to recursively expand/collapse all or part of the tree.

	Parameters:
		recursive - boolean, defaults to false. With recursive set to true, all child nodes are recursively toggle to this node's new state.
		state - boolean. If undefined, the node's state is toggled. If true or false, the node can be explicitly opened or closed.
	*/

	toggle: function(recursive, state) {

		this.open = (state === undefined ? !this.open : state);
		this.update();

		this.onExpand(this.open);
		this.control.onExpand(this, this.open);

		if (recursive) this.nodes.forEach( function(node) {
			node.toggle(true, this.open);
		}, this);

	},

	/*
	Property: select
		Called by <MooTreeControl> when the selection changes.
		You should not manually call this method - to set the selection, use the <MooTreeControl.select> method.
	*/

	select: function(state) {
		this.selected = state;
		this.update();
		this.onSelect(state);
	},

	/*
	Property: load
		Asynchronously load an XML structure into a node of this tree.

	Parameters:
		url - string, required, specifies the URL from which to load the XML document.
		vars - query string, optional.
	*/

	load: function(url, vars) {

		if (this.loading) return; // if this node is already loading, return
		this.loading = true;      // flag this node as loading

		this.toggle(false, true); // expand the node to make the loader visible

		this.clear();

		this.insert(this.control.loader);

		var f = function() {
			new Request({
				method: 'GET',
				url: url,
				onSuccess: this._loaded.bind(this),
				onFailure: this._load_err.bind(this)
			}).send(url, vars || '');
		}.bind(this).delay(20);

		//window.setTimeout(f.bind(this), 20); // allowing a small delay for the browser to draw the loader-icon.

	},

	_loaded: function(text, xml) {
		// called on success - import nodes from the root element:
		this.control.disable();
		this.clear();
		this._import(xml.documentElement);
		this.control.enable();
		this.loading = false;
	},

	_import: function(e) {
		// import childnodes from an xml element:
		var n = e.childNodes;
		for (var i=0; i<n.length; i++) if (n[i].tagName == 'node') {
			var opt = {data:{}};
			var a = n[i].attributes;
			for (var t=0; t<a.length; t++) {
				switch (a[t].name) {
					case 'text':
					case 'id':
					case 'icon':
					case 'openicon':
					case 'color':
					case 'open':
						opt[a[t].name] = a[t].value;
						break;
					default:
						opt.data[a[t].name] = a[t].value;
				}
			}
			var node = this.insert(opt);
			if (node.data.load) {
				node.open = false; // can't have a dynamically loading node that's already open!
				node.insert(this.control.loader);
				node.onExpand = function(state) {
					this.load(this.data.load);
					this.onExpand = new Function();
				}
			}
			// recursively import subnodes of this node:
			if (n[i].childNodes.length) node._import(n[i]);
		}
	},

	_load_err: function(req) {
		window.alert('Error loading: ' + this.text);
	}

});
