/**
 * eGroupWare egw_action framework - egw action framework
 *
 * @link http://www.egroupware.org
 * @author Andreas Stöckel <as@stylite.de>
 * @copyright 2011 by Andreas Stöckel
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package egw_action
 * @version $Id$
 */

if (typeof window._egwActionClasses == "undefined")
	window._egwActionClasses = {}
_egwActionClasses["popup"] = {
	"actionConstructor": egwPopupAction,
	"implementation": getPopupImplementation
}

function egwPopupAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple)
{
	var action = new egwAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple);

	action.type = "popup";
	action.canHaveChildren = ["popup"];
	action["default"] = false;
	action.order = 0;
	action.group = 0;

	action.set_default = function(_value) {
		action["default"] = _value;
	}

	action.set_order = function(_value) {
		action.order = _value;
	}

	action.set_group = function(_value) {
		action.group = _value;
	}

	return action;
}

var
	_popupActionImpl = null;

function getPopupImplementation()
{
	if (!_popupActionImpl)
	{
		_popupActionImpl = new egwPopupActionImplementation();
	}
	return _popupActionImpl
}

function egwPopupActionImplementation()
{
	var ai = new egwActionImplementation();

	ai.type = "popup";

	ai.doRegisterAction = function(_aoi, _callback, _context)
	{
		var node = _aoi.getDOMNode();

		if (node)
		{
			node.ondblclick = function(e) {
				if (typeof document.selection != "undefined" && typeof document.selection.empty != "undefined")
				{
					document.selection.empty();
				}
				else if( typeof window.getSelection != "undefined")
				{
					var sel = window.getSelection();
					sel.removeAllRanges();
				}

				_callback.call(_context, "default", ai);

				return false;
			}

			node.oncontextmenu = function(e) {
				//Obtain the event object
				if (!e)
				{
					e = window.event;
				}

				if (_egw_active_menu)
				{
					_egw_active_menu.hide()
				}
				else
				{
					_xy = ai._getPageXY(e);
					_callback.call(_context, _xy, ai);
				}

				e.cancelBubble = true;
				if (e.stopPropagation)
				{
					e.stopPropagation();
				}
				return false;
			}

			return true;
		}
		return false;
	}

	ai.doUnregisterAction = function(_aoi)
	{
		//
	}


	/**
	 * Builds the context menu and shows it at the given position/DOM-Node.
	 */
	ai.doExecuteImplementation = function(_context, _selected, _links, _target)
	{
		if (typeof _target == "undefined")
		{
			_target = null;
		}

		if (_context != "default")
		{
			//Check whether the context has the posx and posy parameters
			if ((typeof _context.posx != "number" || typeof _context.posy != "number") &&
			    typeof _context.id != "undefined")
			{
				// Calculate context menu position from the given DOM-Node
				var node = _context;

				x = node.offsetLeft;
				y = node.offsetTop;

				_context = {"posx": x, "posy": y}
			}

			var menu = ai._buildMenu(_links, _selected, _target);
			menu.showAt(_context.posx, _context.posy);

			return true;
		}
		else
		{
			var defaultAction = null;
			for (k in _links)
			{
				if (_links[k].actionObj["default"] && _links[k].enabled)
				{
					defaultAction = _links[k].actionObj;
					break;
				}
			}

			if (defaultAction)
			{
				defaultAction.execute(_selected);
			}
		}

		return false;
	}

	/**
	 * Groups and sorts the given action tree layer
	 */
	ai._groupLayers = function(_layer, _links, _parentGroup)
	{
		// Seperate the multiple groups out of the layer
		var link_groups = {};

		for (var i = 0; i < _layer.children.length; i++)
		{
			var actionObj = _layer.children[i].action;

			// Check whether the link group of the current element already exists,
			// if not, create the group
			var grp = actionObj.group;
			if (typeof link_groups[grp] == "undefined")
			{
				link_groups[grp] = [];
			}

			// Search the link data for this action object if none is found,
			// visible and enabled = true is assumed
			var visible = true;
			var enabled = true;

			if (typeof _links[actionObj.id] != "undefined")
			{
				visible = _links[actionObj.id].visible;
				enabled = _links[actionObj.id].enabled;
			}

			// Insert the element in order
			var inserted = false;
			var groupObj = {
				"actionObj": actionObj,
				"visible": visible,
				"enabled": enabled,
				"groups": []
			};

			for (var j = 0; j < link_groups[grp].length; j++)
			{
				var elem = link_groups[grp][j].actionObj;
				if (elem.order > actionObj.order)
				{
					inserted = true;
					link_groups[grp].splice(j, 0, groupObj);
					break;
				}
			}

			// If the object hasn't been inserted, add it to the end of the list
			if (!inserted)
			{
				link_groups[grp].push(groupObj);
			}

			// If this child itself has children, group those elements too
			if (_layer.children[i].children.length > 0)
			{
				this._groupLayers(_layer.children[i], _links, groupObj);
			}
		}

		// Transform the link_groups object into an sorted array
		var groups = [];

		for (k in link_groups)
		{
			groups.push({"grp": k, "links": link_groups[k]});
		}

		groups.sort(function(a, b) {
			var ia = parseInt(a.grp);
			var ib = parseInt(b.grp);
			return (ia > ib) ? 1 : ((ia < ib) ? -1 : 0);
		});

		// Append the groups to the groups2 array
		var groups2 = [];
		for (k in groups)
		{
			groups2.push(groups[k].links);
		}

		_parentGroup.groups = groups2;
	}

	/**
	 * Build the menu layers
	 */
	ai._buildMenuLayer = function(_menu, _groups, _selected, _enabled, _target)
	{
		var firstGroup = true;

		for (var i = 0; i < _groups.length; i++)
		{
			var firstElem = true;

			// Go through the elements of each group
			for (var j = 0; j < _groups[i].length; j++)
			{
				var link = _groups[i][j];

				if (link.visible)
				{
					// Add an seperator after each group
					if (!firstGroup && firstElem)
					{
						_menu.addItem("", "-");
					}
					firstElem = false;

					var item = _menu.addItem(link.actionObj.id, link.actionObj.caption,
						link.actionObj.iconUrl);
					item["default"] = link.actionObj["default"];
					item.data = link.actionObj;
					if (link.enabled && _enabled)
					{
						item.set_onClick(function(elem) {
							elem.data.execute(_selected, _target);
						});
					}
					else
					{
						item.set_enabled(false);
					}

					// Append the parent groups
					if (link.groups)
					{
						this._buildMenuLayer(item, link.groups, _selected, link.enabled, _target);
					}
				}
			}

			firstGroup = firstGroup && firstElem;
		}
	}

	/**
	 * Builds the context menu from the given action links
	 */
	ai._buildMenu = function(_links, _selected, _target)
	{
		// Build a tree containing all actions
		var tree = {"root": []};

		for (k in _links)
		{
			_links[k].actionObj.appendToTree(tree);
		}

		// We need the dummy object container in order to pass the array by 
		// reference
		var groups = {
			"groups": []
		};

		if (tree.root.length > 0)
		{
			// Sort every action object layer by the given sort position and grouping
			this._groupLayers(tree.root[0], _links, groups);
		}

		var menu = new egwMenu();

		// Build the menu layers
		this._buildMenuLayer(menu, groups.groups, _selected, true, _target);

		return menu;
	}

	ai._getPageXY = function getPageXY(event)
	{
		// document.body.scrollTop does not work in IE
		var scrollTop = document.body.scrollTop ? document.body.scrollTop :
			document.documentElement.scrollTop;
		var scrollLeft = document.body.scrollLeft ? document.body.scrollLeft :
			document.documentElement.scrollLeft;

		return {'posx': (event.clientX + scrollLeft), 'posy': (event.clientY + scrollTop)};
	}

	return ai;
}