/**
 * EGroupware eTemplate2 - Class which contains a the data model for nextmatch widgets
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link http://www.egroupware.org
 * @author Andreas Stöckel
 * @copyright Stylite 2012
 * @version $Id$
 */

"use strict";

/*egw:uses
	et2_core_common;
	et2_core_inheritance;

	et2_dataview_view_row;
	et2_dataview_controller;
	et2_dataview_interfaces;

	et2_extension_nextmatch_actions; // Contains nm_action

	egw_data;
*/

/**
 * @augments et2_dataview_controller
 */
var et2_nextmatch_controller = et2_dataview_controller.extend(et2_IDataProvider,
{
	/**
	 * Initializes the nextmatch controller.
	 *
	 * @param _parentController is the parent nextmatch controller instance
	 * @param _egw is the api instance
	 * @param _execId is the execId of the etemplate
	 * @param _widget is the nextmatch-widget we are fetching data for.
	 * @param _grid is the grid the grid controller will be controlling
	 * @param _rowProvider is the nextmatch row provider instance.
	 * @param _objectManager is the parent object manager (if null, the object
	 * manager) will be created using
	 * @param _actionLinks contains the action links
	 * @param _actions contains the actions, may be null if an object manager
	 * is given.
	 * @memberOf et2_nextmatch_controller
	 */
	init: function (_parentController, _egw, _execId, _widget, _parentId,
			_grid, _rowProvider, _actionLinks, _objectManager, _actions) {

		// Copy the egw reference
		this.egw = _egw;

		// Keep a reference to the widget
		this._widget = _widget;

		// Copy the given parameters
		this._actionLinks = _actionLinks;
		this._execId = _execId;
		this._widgetId = _widget.id;
		this._parentId = _parentId;
		this._rowProvider = _rowProvider;

		// Initialize the action and the object manager
		// _initActions calls _init_link_dnd, which uses this._actionLinks,
		// so this must happen after the above parameter copying
		if (!_objectManager)
		{
			this._initActions(_actions);
		}
		else
		{
			this._actionManager = null;
			this._objectManager = _objectManager;
		}
		// Add our selection callback to selection manager
		var self = this;
		this._objectManager.setSelectedCallback = function() {self._selectCallback.apply(self,[this,arguments]);};

		// Call the parent et2_dataview_controller constructor
		this._super(_parentController, _grid, this, this._rowCallback,
			this._linkCallback, this, this._objectManager);

		// We start with no filters
		this._filters = {};

		// Keep selection across filter changes
		this.kept_selection = null;
		this.kept_focus = null;
		this.kept_expansion = [];

		// Directly use the API-Implementation of dataRegisterUID and
		// dataUnregisterUID
		this.dataUnregisterUID = _egw.dataUnregisterUID;

	},

	destroy: function () {
		// If the actionManager variable is set, the object- and actionManager
		// were created by this instance -- clear them
		if (this._actionManager)
		{
			this._objectManager.remove();
			this._actionManager.remove();
		}

		this._super();
	},

	/**
	 * Updates the filter instance.
	 */
	setFilters: function (_filters) {
		// Update the filters
		this._filters = _filters;
	},

	/**
	 * Keep the selection, if possible, across a data fetch and restore it
	 * after
	 */
	keepSelection: function() {
		this.kept_selection = this._selectionMgr ? this._selectionMgr.getSelected() : null;
		this.kept_focus = this._selectionMgr && this._selectionMgr._focusedEntry ?
			this._selectionMgr._focusedEntry.uid || null : null;

		// Find expanded rows
		var nm = this._widget;
		var controller = this;
		$j('.arrow.opened',this._widget.getDOMNode(this._widget)).each(function() {
			var entry = controller.getRowByNode(this);
			if(entry && entry.uid)
			{
				controller.kept_expansion.push(entry.uid);
			}
		});
	},

	getObjectManager: function () {
		return this._objectManager;
	},

	/**
	 * Deletes a row from the grid
	 *
	 * @param {string} uid
	 */
	deleteRow: function(uid) {
		var entry = this._selectionMgr._getRegisteredRowsEntry(uid);

		// Unselect
		this._selectionMgr.setSelected(uid,false);

		if(entry && entry.idx !== null)
		{
			// This will remove the row, but add an empty to the end.
			// That's OK, because it will be removed when we update the row count
			this._grid.deleteRow(entry.idx);

			// Trigger controller to remove from internals
			this.egw.dataStoreUID(uid,null);
			// Stop caring about this ID
			this.egw.dataDeleteUID(uid);
			// Remove from internal map
			delete this._indexMap[entry.idx];

			// Update the indices of all elements after the current one
			for(var mapIndex = entry.idx + 1; typeof this._indexMap[mapIndex] !== 'undefined'; mapIndex++)
			{
				var entry = this._indexMap[mapIndex];
				entry.idx = mapIndex-1;
				this._indexMap[mapIndex-1] = entry;

				// Update selection mgr too
				if(entry.uid && typeof this._selectionMgr._registeredRows[entry.uid] !== 'undefined')
				{
					var reg = this._selectionMgr._getRegisteredRowsEntry(entry.uid);
					reg.idx = entry.idx;
					if(reg.ao && reg.ao._index) reg.ao._index = entry.idx;
				}
			}
			// Remove last one, it was moved to mapIndex-1 before increment
			delete this._indexMap[mapIndex-1];

			// Not needed, they share by reference
			// this._selectionMgr.setIndexMap(this._indexMap);
		}
	},

	/** -- PRIVATE FUNCTIONS -- **/

	/**
	 * Initializes the action and the object manager.
	 */
	_initActions: function (_actions) {
		// Generate a uid for the action and object manager
		var uid = this._widget.id||this.egw.uid();

		if(_actions == null) _actions = [];

		// Initialize the action manager and add some actions to it
		// Only look 1 level deep
		var gam = egw_getActionManager(this.egw.appName,true,1);
		if(this._actionManager == null)
		{
			this._actionManager = gam.addAction("actionManager", uid);
		}
		this._actionManager.updateActions(_actions, this.egw.appName);
		var data = this._actionManager.data;
		if (data == 'undefined' || !data)
		{
			data = {};
		}
		data.nextmatch = this._widget;
		this._actionManager.set_data(data);

		// Set the default execute handler
		var self = this;
		this._actionManager.setDefaultExecute(function (_action, _senders, _target) {
			// Get the selected ids descriptor object
			var ids = self._selectionMgr.getSelected();

			// Pass a reference to the actual widget
			if (typeof _action.data == 'undefined' || !_action.data) _action.data = {};
			_action.data.nextmatch = self._widget;

			// Call the nm_action function with the ids
			nm_action(_action, _senders, _target, ids);
		});

		// Set the 'Select All' handler
		var select_all = this._actionManager.getActionById('select_all');
		if(select_all)
		{
			select_all.set_onExecute(jQuery.proxy(function(action, selected) {
				this._selectionMgr.selectAll();
			}, this));
		}

		// Initialize the object manager - look for application
		// object manager 1 level deep
		var gom = egw_getObjectManager(this.egw.appName,true,1);
		if(this._objectManager == null)
		{
			this._objectManager = gom.addObject(
				new egwActionObjectManager(uid, this._actionManager));
		}
		this._objectManager.flags = this._objectManager.flags
				| EGW_AO_FLAG_DEFAULT_FOCUS | EGW_AO_FLAG_IS_CONTAINER;

		this._init_links_dnd(this._actionManager);
	},

	/**
	 * Automatically add dnd support for linking
	 */
	_init_links_dnd: function() {
		var mgr = this._actionManager;
		var self = this;

		var drop_action = mgr.getActionById('egw_link_drop');
		var drag_action = mgr.getActionById('egw_link_drag');

		// Check if this app supports linking
		if(!egw.link_get_registry(this.dataStorePrefix || this.egw.appName, 'query') ||
			egw.link_get_registry(this.dataStorePrefix || this.egw.appName, 'title'))
		{
			if(drop_action)
			{
				drop_action.remove();
				if(this._actionLinks.indexOf(drop_action.id) >= 0)
				{
					this._actionLinks.splice(this._actionLinks.indexOf(drop_action.id),1);
				}
			}
			if(drag_action)
			{
				drag_action.remove();
				if(this._actionLinks.indexOf(drag_action.id) >= 0)
				{
					this._actionLinks.splice(this._actionLinks.indexOf(drag_action.id),1);
				}
			}
			return;
		}

		// Don't re-add
		if(drop_action == null)
		{
			// Create the drop action that links entries
			drop_action = mgr.addAction('drop', 'egw_link_drop', this.egw.lang('link'), 'link', function(action, source, dropped) {
				// Extract link IDs
				var links = [];
				var id = '';
				for(var i = 0; i < source.length; i++)
				{
					if(!source[i].id) continue;
					id = source[i].id.split('::');
					links.push({app: id[0] == 'filemanager' ? 'link' : id[0], id: id[1]});
				}
				if(!links.length)
				{
					return;
				}

				// Link the entries
				self.egw.json(self.egw.getAppName()+".etemplate_widget_link.ajax_link.etemplate",
					dropped.id.split('::').concat([links]),
					function(result) {
						if(result)
						{
							// Update the target to show the liks
							this._widget.refresh(dropped.id,'update');
						}
					},
					self,
					true,
					self
				).sendRequest();
				
			},true);
		}
		if(this._actionLinks.indexOf(drop_action.id) < 0)
		{
			this._actionLinks.push(drop_action.id);
		}
		// Accept other links, and files dragged from the filemanager
		// This does not handle files dragged from the desktop.  They are
		// handled by et2_nextmatch, since it needs DOM stuff
		if(drop_action.acceptedTypes.indexOf('link') == -1)
		{
			drop_action.acceptedTypes.push('link');
		}

		// Don't re-add
		if(drag_action == null)
		{
			// Create drag action that allows linking
			drag_action = mgr.addAction('drag', 'egw_link_drag', this.egw.lang('link'), 'link', function(action, selected) {
				// Drag helper - list titles.  Arbitrarily limited to 10.
				var helper = $j(document.createElement("div"));
				for(var i = 0; i < selected.length && i < 10; i++)
				{
					var id = selected[i].id.split('::');
					var span = $j(document.createElement('span')).appendTo(helper);
					self.egw.link_title(id[0],id[1], function(title) {
						this.append(title);
						this.append('<br />');
					}, span);
				}
				// As we wanted to have a general defaul helper interface, we return null here and not using customize helper for links
				// TODO: Need to decide if we need to create a customized helper interface for links anyway
				//return helper;
				return null;
			},true);
		}
		if(this._actionLinks.indexOf(drag_action.id) < 0)
		{
			this._actionLinks.push(drag_action.id);
		}
		drag_action.set_dragType('link');
	},

	/**
	 * Set the data cache prefix
	 * Overridden from the parent to re-check automatically the added link dnd
	 * since the prefix is used in support detection.
	 */
	setPrefix: function(prefix) {
		this._super.apply(this, arguments)

		this._init_links_dnd(this._actionManager);
	},
	
	/**
	 * Overwrites the inherited _destroyCallback function in order to be able
	 * to free the "rowWidget".
	 */
	_destroyCallback: function (_row) {
		// Destroy any widget associated to the row
		if (this.entry.widget)
		{
			this.entry.widget.free();
			this.entry.widget = null;
		}

		// Call the inherited function
		this._super.apply(this, arguments);
	},

	/**
	 * Creates the actual data row.
	 *
	 * @param _data is an array containing the row data
	 * @param _tr is the tr into which the data will be inserted
	 * @param _idx is the index of the row
	 * @param _entry is the internal row datastructure of the controller, in
	 * this special case used to store the rowWidget reference, so that it can
	 * be properly freed.
	 */
	_rowCallback: function (_data, _tr, _idx, _entry) {
		// Let the row provider fill in the data row -- store the returned
		// rowWidget inside the _entry
		_entry.widget = this._rowProvider.getDataRow(
			{ "content": _data }, _tr, _idx, this);
	},

	/**
	 * Returns the names of action links for a given data row -- currently these are
	 * always the same links, as we controll enabled/disabled over the row
	 * classes, unless the row UID is "", then it's an 'empty' row.
	 *
	 * The empty row placeholder can still have actions, but nothing that requires
	 * an actual UID.
	 *
	 * @TODO: Currently empty row is just add, need to actually filter somehow.  Here
	 * 	might not be the right place.
	 *
	 * @param _data Object The data for the row
	 * @param _idx int The row index
	 * @param _uid String The row's ID
	 *
	 * @return Array List of action names that valid for the row
	 */
	_linkCallback: function (_data, _idx, _uid) {
		if(_uid.trim() != "")
		{
			return this._actionLinks;
		}

		// No UID, so return a filtered list of actions that doesn't need a UID
		var links = [];
		try {
			links = typeof this._widget.options.settings.placeholder_actions != 'undefined' ? this._widget.options.settings.placeholder_actions : ["add"];
		} catch (e) {
		}

		return links;
	},


	/**
	 * Overridden from the parent to also process any additional data that
	 * the data source adds, such as readonlys and additonal content.
	 * For example, non-numeric IDs in rows are added to the content manager
	 */
	_fetchCallback: function (_response) {
		var nm = this.self._widget;
		if(!nm)
		{
			// Nextmatch either not connected, or it tried to destroy this
			// but the server returned something
			return;
		}
		// Readonlys
		// Other stuff
		for(var i in _response.rows)
		{
			if(jQuery.isNumeric(i)) continue;
			if(i == 'sel_options')
			{
				var mgr = nm.getArrayMgr(i);
				for(var id in _response.rows.sel_options)
				{
					mgr.data[id] = _response.rows.sel_options[id];
					var select = nm.getWidgetById(id);
					if(select && select.set_select_options)
					{
						select.set_select_options(_response.rows.sel_options[id]);
					}
					// Clear rowProvider internal cache so it uses new values
					if(id == 'cat_id')
					{
						this.self._rowProvider.categories = null;
					}
				}
			}
			else
			{
				var mgr = nm.getArrayMgr('content');
				mgr.data[i] = _response.rows[i];

				// It's not enough to just update the data, the widgets need to
				// be updated too, if there are matching widgets.
				var widget = nm.getWidgetById(i);
				if(widget && widget.set_value)
				{
					widget.set_value(mgr.getEntry(i));
				}
			}
		}

		// If we're doing an autorefresh and the count decreases, preserve the
		// selection or it will be lost when the grid rows are shuffled.  Increases
		// are fine though.
		if(this.self && this.self.kept_selection == null &&
			!this.refresh && this.self._grid.getTotalCount() > _response.total)
		{
			this.self.keepSelection();
		}

		// Call the inherited function
		this._super.apply(this, arguments);

		// Restore selection, if passed
		if(this.self && this.self.kept_selection && this.self._selectionMgr)
		{
			if(this.self.kept_selection.all)
			{
				this.self._selectionMgr.selectAll();
			}
			for(var i = 0; i < this.self.kept_selection.ids.length || 0; i++)
			{
				this.self._selectionMgr.setSelected(this.self.kept_selection.ids[i],true);
			}
			if(this.self.kept_focus)
			{
				this.self._selectionMgr.setFocused(this.self.kept_focus,true);
			}
			// Re-expanding rows handled in et2_extension_nextmatch_rowProvider
			// Expansions might still be valid, so we don't clear them
			this.self.kept_selection = null;
			this.self.kept_focus = null;
		}
	},

	/**
	 * Execute the select callback when the row selection changes
	 */
	_selectCallback: function(action,senders)
	{
		if(typeof senders == "undefined")
		{
			senders = [];
		}
		if(!this._widget) return;
		this._widget.onselect.call(this._widget, action,senders);
	},

	/** -- Implementation of et2_IDataProvider -- **/


	dataFetch: function (_queriedRange, _callback, _context) {

		// Merge the parent id into the _queriedRange if it is set
		if (this._parentId !== null)
		{
			_queriedRange["parent_id"] = this._parentId;
		}

		// sub-levels dont have there own _filters object, need to use the one from parent (or it's parents parent)
		var obj = this;
		while((typeof obj._filters == 'undefined' || jQuery.isEmptyObject(obj._filters)) && obj._parentController)
		{
			obj = obj._parentController;
		}

		// Pass the fetch call to the API, multiplex the data about the
		// nextmatch instance into the call.
		this.egw.dataFetch(
				this._widget.getInstanceManager().etemplate_exec_id || this._execId,
				_queriedRange,
				obj._filters,
				this._widgetId,
				_callback,
				_context);
	},

	dataRegisterUID: function (_uid, _callback, _context) {
		this.egw.dataRegisterUID(_uid, _callback, _context,
			this._widget.getInstanceManager().etemplate_exec_id || this._execId,
			this._widgetId
		);
	},

	dataUnregisterUID: function () {
		// Overwritten in the constructor
	}

});