/**
 * EGroupware eTemplate2 - JS History log
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link http://www.egroupware.org
 * @author Nathan Gray
 * @copyright 2012 Nathan Gray
 */

/*egw:uses
	/vendor/bower-asset/jquery/dist/jquery.js;
	/vendor/bower-asset/jquery-ui/jquery-ui.js;
	et2_core_valueWidget;

	// Include the grid classes
	et2_dataview;
*/

/**
 * eTemplate history log widget displays a list of changes to the current record.
 * The widget is encapsulated, and only needs the record's ID, and a map of
 * fields:widgets for display.
 *
 * It defers its initialization until the tab that it's on is selected, to avoid
 * wasting time if the user never looks at it.
 *
 * @augments et2_valueWidget
 */
var et2_historylog = (function(){ "use strict"; return et2_valueWidget.extend([et2_IDataProvider,et2_IResizeable],
{
	createNamespace: true,
	attributes: {
		"value": {
			"name": "Value",
			"type": "any",
			"description": "Object {app: ..., id: ..., status-widgets: {}} where status-widgets is a map of fields to widgets used to display those fields"
		},
		"status_id":{
			"name": "status_id",
			"type": "string",
			"default": "status",
			"description": "The history widget is traditionally named 'status'.  If you name another widget in the same template 'status', you can use this attribute to re-name the history widget.  "
		},
		"columns": {
			"name": "columns",
			"type": "string",
			"default": "user_ts,owner,status,new_value,old_value",
			"description": "Columns to display.  Default is user_ts,owner,status,new_value,old_value"
		},
		"get_rows": {
			"name": "get_rows",
			"type": "string",
			"default": "EGroupware\\Api\\Storage\\History::get_rows",
			"description": "Method to get rows"
		}
	},

	legacyOptions: ["status_id"],
	columns: [
		{'id': 'user_ts', caption: 'Date', 'width': '120px', widget_type: 'date-time'},
		{'id': 'owner', caption: 'User', 'width': '150px', widget_type: 'select-account'},
		{'id': 'status', caption: 'Changed', 'width': '120px', widget_type: 'select'},
		{'id': 'new_value', caption: 'New Value', 'width': '50%'},
		{'id': 'old_value', caption: 'Old Value', 'width': '50%'}
	],

	TIMESTAMP: 0, OWNER: 1, FIELD: 2, NEW_VALUE: 3, OLD_VALUE: 4,

	/**
	 * Constructor
	 *
	 * @memberOf et2_historylog
	 */
	init: function() {
		this._super.apply(this, arguments);
		this.div = jQuery(document.createElement("div"))
			.addClass("et2_historylog");

		this.innerDiv = jQuery(document.createElement("div"))
			.appendTo(this.div);
	},

	set_status_id: function(_new_id) {
		this.options.status_id = _new_id;
	},

	doLoadingFinished: function() {
		this._super.apply(this, arguments);

		// Find the tab widget, if there is one
		var tabs = this;
		do {
			tabs = tabs._parent;
		} while (tabs != this.getRoot() && tabs._type != 'tabbox');
		if(tabs != this.getRoot())
		{
			// Find the tab index
			for(var i = 0; i < tabs.tabData.length; i++)
			{
				// Find the tab
				if(tabs.tabData[i].contentDiv.has(this.div).length)
				{
					// Bind the action to when the tab is selected
					var handler = function(e) {
						e.data.div.unbind("click.history");
						// Bind on click tap, because we need to update history size
						// after a rezise happend and history log was not the active tab
						e.data.div.bind("click.history",{"history": e.data.history, div: tabs.tabData[i].flagDiv}, function(e){
							if(e.data.history && e.data.history.dynheight)
							{
								e.data.history.dynheight.update(function(_w, _h)
								{
									e.data.history.dataview.resize(_w, _h);
								});
							}
						});

						if (typeof e.data.history.dataview == "undefined")
						{
							e.data.history.finishInit();
							if(e.data.history.dynheight)
							{
								e.data.history.dynheight.update(function(_w, _h) {
									e.data.history.dataview.resize(_w, _h);
								});
							}
						}

					};
					tabs.tabData[i].flagDiv.bind("click.history",{"history": this, div: tabs.tabData[i].flagDiv}, handler);

					// Display if history tab is selected
					if(i == tabs.get_active_tab() && typeof this.dataview == 'undefined')
					{
						tabs.tabData[i].flagDiv.trigger("click.history");
					}
					break;
				}
			}
		}
		else
		{
			this.finishInit();
		}
	},

	/**
	 * Finish initialization which was skipped until tab was selected
	 */
	finishInit: function() {
		// No point with no ID
		if(!this.options.value || !this.options.value.id)
		{
			return;
		}
		this._filters = {
			record_id: this.options.value.id,
			appname: this.options.value.app,
			get_rows: this.options.get_rows
		};

		// Warn if status_id is the same as history id, that causes overlap and missing labels
		if(this.options.status_id === this.id)
		{
			this.egw().debug("warn", "status_id attribute should not be the same as historylog ID");
		}
		var _columns = typeof this.options.columns === "string" ?
			this.options.columns.split(',') : this.options.columns;

		// Create the dynheight component which dynamically scales the inner
		// container.
		this.div.parentsUntil('.et2_tabs').height('100%');
		this.dynheight = new et2_dynheight(this.div.parent(),
				this.innerDiv, 250
		);

		// Create the outer grid container
		this.dataview = new et2_dataview(this.innerDiv, this.egw());
		var dataview_columns = [];
		var _columns = typeof this.options.columns === "string" ?
			this.options.columns.split(',') : this.options.columns;
		for (var i = 0; i < this.columns.length; i++)
		{
			dataview_columns[i] = {
					"id": this.columns[i].id,
					"caption": this.columns[i].caption,
					"width":this.columns[i].width,
					"visibility":_columns.indexOf(this.columns[i].id) < 0 ?
						ET2_COL_VISIBILITY_INVISIBLE : ET2_COL_VISIBILITY_VISIBLE
			};
		}
		this.dataview.setColumns(dataview_columns);

		// Create widgets for columns that stay the same, and set up varying widgets
		this.createWidgets();

		// Create the gridview controller
		var linkCallback = function() {};
		this.controller = new et2_dataview_controller(null, this.dataview.grid,
			this, this.rowCallback, linkCallback, this,
			null
		);

		var total = typeof this.options.value.total !== "undefined" ?
			this.options.value.total : 0;

		// This triggers an invalidate, which updates the grid
		this.dataview.grid.setTotalCount(total);

		// Insert any data sent from server, so invalidate finds data already
		if(this.options.value.rows && this.options.value.num_rows)
		{
			this.controller.loadInitialData(
				this.options.value.dataStorePrefix,
				this.options.value.row_id,
				this.options.value.rows
			);
			// Remove, to prevent duplication
			delete this.options.value.rows;
			// This triggers an invalidate, which updates the grid
			this.dataview.grid.setTotalCount(total);
		}
		else
		{
			// Trigger the initial update
			this.controller.update();
		}

		// Write something inside the column headers
		for (var i = 0; i < this.columns.length; i++)
		{
			jQuery(this.dataview.getHeaderContainerNode(i)).text(this.columns[i].caption);
		}

		// Register a resize callback
		var self = this;
		jQuery(window).on('resize.' +this.options.value.app + this.options.value.id, function() {
			if (self && typeof self.dynheight != 'undefined') self.dynheight.update(function(_w, _h) {
				self.dataview.resize(_w, _h);
			});
		});
	},

	/**
	 * Destroys all
	 */
	destroy: function() {
		// Unbind, if bound
		if(this.options.value && !this.options.value.id)
		{
			jQuery(window).off('.' +this.options.value.app + this.options.value.id);
		}

		// Free the widgets
		for(var i = 0; i < this.columns.length; i++)
		{
			if(this.columns[i].widget) this.columns[i].widget.destroy();
		}
		for(var key in this.fields)
		{
			this.fields[key].widget.destroy();
		}
		if(this.diff) this.diff.widget.destroy();

		// Free the grid components
		if(this.dataview) this.dataview.free();
		if(this.rowProvider) this.rowProvider.free();
		if(this.controller) this.controller.free();
		if(this.dynheight) this.dynheight.free();

		this._super.apply(this, arguments);
	},

	/**
	 * Create all needed widgets for new / old values
	 */
	createWidgets: function() {

		// Constant widgets - first 3 columns
		for(var i = 0; i < this.columns.length; i++)
		{
			if(this.columns[i].widget_type)
			{
				// Status ID is allowed to be remapped to something else.  Only affects the widget ID though
				var attrs = {'readonly': true, 'id': (i == this.FIELD ? this.options.status_id : this.columns[i].id)};
				this.columns[i].widget = et2_createWidget(this.columns[i].widget_type, attrs, this);
				this.columns[i].widget.transformAttributes(attrs);
				this.columns[i].nodes = jQuery(this.columns[i].widget.getDetachedNodes());
			}
		}

		// Add in handling for links
		if(typeof this.options.value['status-widgets']['~link~'] == 'undefined')
		{
			this.columns[this.FIELD].widget.optionValues['~link~'] = this.egw().lang('link');
			this.options.value['status-widgets']['~link~'] = 'link';
		}

		// Add in handling for files
		if(typeof this.options.value['status-widgets']['~file~'] == 'undefined')
		{
			this.columns[this.FIELD].widget.optionValues['~file~'] = this.egw().lang('File');
			this.options.value['status-widgets']['~file~'] = 'vfs';
		}

		// Add in handling for user-agent & action
		if(typeof this.options.value['status-widgets']['user_agent_action'] == 'undefined')
		{
			this.columns[this.FIELD].widget.optionValues['user_agent_action'] = this.egw().lang('User-agent & action');
		}

		// Per-field widgets - new value & old value
		this.fields = {};

		var labels = this.columns[this.FIELD].widget.optionValues;

		// Custom fields - Need to create one that's all read-only for proper display
		var cf_widget = et2_createWidget('customfields', {'readonly':true}, this);
		cf_widget.loadFields();
		// Override this or it may damage the real values
		cf_widget.getValue = function() {return null;};
		for(var key in cf_widget.widgets)
		{
			// Add label
			labels[cf_widget.prefix + key] = cf_widget.options.customfields[key].label;

			// If it doesn't support detached nodes, just treat it as text
			if(cf_widget.widgets[key].getDetachedNodes)
			{
				var nodes = cf_widget.widgets[key].getDetachedNodes();
				for(var i = 0; i < nodes.length; i++)
				{
					if(nodes[i] == null) nodes.splice(i,1);
				}

				// Save to use for each row
				this.fields[cf_widget.prefix + key] = {
					attrs: cf_widget.widgets[key].options,
					widget: cf_widget.widgets[key],
					nodes: jQuery(nodes)
				};
			}
		}
		// Add all cf labels
		this.columns[this.FIELD].widget.set_select_options(labels);

		// From app
		for(var key in this.options.value['status-widgets'])
		{
			var attrs = jQuery.extend({'readonly': true, 'id': key}, this.getArrayMgr('modifications').getEntry(key));
			var field = attrs.type || this.options.value['status-widgets'][key];
			var options = null;
			var widget = this._create_widget(key, field, attrs, options);
			if(widget === null)
			{
				continue;
			}
			if(widget.instanceOf(et2_selectbox)) widget.options.multiple = true;
			widget.transformAttributes(attrs);

			// Save to use for each row
			var nodes = widget._children.length ? [] : jQuery(widget.getDetachedNodes());
			for(var i = 0; i < widget._children.length; i++)
			{
				nodes.push(jQuery(widget._children[i].getDetachedNodes()));
			}
			this.fields[key] = {
				attrs: attrs,
				widget: widget,
				nodes: nodes
			};
		}
		// Widget for text diffs
		var diff = et2_createWidget('diff', {}, this);
		this.diff = {
			widget: diff,
			nodes: jQuery(diff.getDetachedNodes())
		};
	},

	_create_widget(key, field, attrs, options)
	{
		var widget = null;

		// If field has multiple parts (is object) and isn't an obvious select box
		if(typeof field === 'object')
		{
			// Check for multi-part statuses needing multiple widgets
			var need_box = false;//!this.getArrayMgr('sel_options').getEntry(key);
			for(var j in field)
			{
				// Require widget to be a widget, to avoid invalid widgets
				// (and template, which is a widget and an infolog todo status)
				if(et2_registry[field[j]] && ['template'].indexOf(field[j]) < 0)// && (et2_registry[field[j]].prototype.instanceOf(et2_valueWidget))
				{
					need_box = true;
					break;
				}
			}

			if(need_box)
			{
				// Multi-part value needs multiple widgets
				widget = et2_createWidget('vbox', attrs, this);
				for(var i in field)
				{
					var type = field[i];
					var child_attrs = jQuery.extend({}, attrs);
					if(typeof type === 'object')
					{
						child_attrs['select_options'] = field[i];
						type = 'select';
					}
					else
					{
						delete child_attrs['select_options'];
					}
					child_attrs.id = i;
					var child = this._create_widget(i, type, child_attrs, options)
					widget.addChild(child);
					child.transformAttributes(child_attrs);
				}
			}
			else
			{
				attrs['select_options'] = field;
			}
		}
		// Check for options after the type, ex: link-entry:infolog
		else if (field.indexOf(':') > 0)
		{
			var options = field.split(':');
			field = options.shift();
		}

		if(widget === null)
		{
			widget = et2_createWidget(typeof field === 'string' ? field : 'select', attrs, this);
		}

		if(!widget.instanceOf(et2_IDetachedDOM))
		{
			this.egw().debug("warn", this, "Invalid widget " + field + " for " + key + ".  Status widgets must implement et2_IDetachedDOM.");
			return null;
		}

		// Parse / set legacy options
		if(options)
		{
			var mgr = this.getArrayMgr("content");
			for(var i = 0; i < options.length && i < widget.legacyOptions.length; i++)
			{
				// Not set
				if(options[i] === "") continue;

				var attr = widget.attributes[widget.legacyOptions[i]];
				var attrValue = options[i];

				// If the attribute is marked as boolean, parse the
				// expression as bool expression.
				if (attr.type === "boolean")
				{
					attrValue = mgr.parseBoolExpression(attrValue);
				}
				else
				{
					attrValue = mgr.expandName(attrValue);
				}
				attrs[widget.legacyOptions[i]] = attrValue;
				if(typeof widget['set_'+widget.legacyOptions[i]] === 'function')
				{
					widget['set_'+widget.legacyOptions[i]].call(widget, attrValue);
				}
				else
				{
					widget.options[widget.legacyOptions[i]] = attrValue;
				}
			}
		}
		return widget;
	},

	getDOMNode: function(_sender) {
		if (_sender == this)
		{
				return this.div[0];
		}

		for (var i = 0; i < this.columns.length; i++)
		{
			if (_sender == this.columns[i].widget)
			{
				return this.dataview.getHeaderContainerNode(i);
			}
		}
		return null;
	},


	dataFetch: function (_queriedRange, _callback, _context) {
		// Skip getting data if there's no ID
		if(!this.value.id) return;

		// Set num_rows to fetch via nextmatch
		if ( this.options.value['num_rows'] )
			_queriedRange['num_rows'] = this.options.value['num_rows'];

		// Pass the fetch call to the API
		this.egw().dataFetch(
			this.getInstanceManager().etemplate_exec_id,
			_queriedRange,
			this._filters,
			this.id,
			_callback,
			_context,
			[]
		);
	},


	// Needed by interface
	dataRegisterUID: function (_uid, _callback, _context) {
		this.egw().dataRegisterUID(_uid, _callback, _context, this.getInstanceManager().etemplate_exec_id,
                                this.id);
	},

	dataUnregisterUID: function (_uid, _callback, _context) {
		// Needed by interface
	},

	/**
	 * The row callback gets called by the gridview controller whenever
	 * the actual DOM-Nodes for a node with the given data have to be
	 * created.
	 *
	 * @param {type} _data
	 * @param {type} _row
	 * @param {type} _idx
	 * @param {type} _entry
	 */
	rowCallback: function(_data, _row, _idx, _entry) {
		var tr = _row.getDOMNode();
		jQuery(tr).attr("valign","top");

		var row = this.dataview.rowProvider.getPrototype("default");
		var self = this;
		jQuery("div", row).each(function (i) {
			var nodes = [];
			var widget = self.columns[i].widget;
			var value = _data[self.columns[i].id];
			if(self.OWNER === i && _data['share_email'])
			{
				// Show share email instead of owner
				widget = undefined;
				value = _data['share_email'];
			}
			// Get widget from list, unless it needs a diff widget
			if(typeof widget == 'undefined' && typeof self.fields[_data.status] != 'undefined' && (
					i < self.NEW_VALUE ||
					i >= self.NEW_VALUE && (
						self.fields[_data.status].nodes || !self._needsDiffWidget(_data['status'], _data[self.columns[self.OLD_VALUE].id])
					)
			))
			{
				widget = self.fields[_data.status].widget;
				if(!widget._children.length)
				{
					nodes = self.fields[_data.status].nodes.clone();
				}
				for(var j = 0; j < widget._children.length; j++)
				{
					nodes.push(self.fields[_data.status].nodes[j].clone());
					if(widget._children[j].instanceOf(et2_diff))
					{
						self._spanValueColumns(jQuery(this));
					}
				}
			}
			else if (widget)
			{
				nodes = self.columns[i].nodes.clone();
			}
			else if ((
				// Already parsed & cached
				typeof _data[self.columns[self.NEW_VALUE].id] == "object" &&
				typeof _data[self.columns[self.NEW_VALUE].id] != "undefined" &&
				_data[self.columns[self.NEW_VALUE].id] !== null) ||	// typeof null === 'object'
				// Large old value
				self._needsDiffWidget(_data['status'], _data[self.columns[self.OLD_VALUE].id]) ||
				// Large new value
				self._needsDiffWidget(_data['status'], _data[self.columns[self.NEW_VALUE].id]))
			{
				// Large text value - span both columns, and show a nice diff
				var jthis = jQuery(this);
				if(i === self.NEW_VALUE)
				{
					// Diff widget
					widget = self.diff.widget;
					nodes = self.diff.nodes.clone();

					if(widget) widget.setDetachedAttributes(nodes, {
						value: value,
						label: jthis.parents("td").prev().text()
					});

					self._spanValueColumns(jthis);
				}
			}
			else
			{
				// No widget fallback - display actual value
				nodes = jQuery('<span>').text(value === null ? '' : value);
			}
			if(widget)
			{
				if(widget._children.length)
				{
					// Multi-part values
					var box = jQuery(widget.getDOMNode()).clone();
					for(var j = 0; j < widget._children.length; j++)
					{
						var id = widget._children[j].id;
						var widget_value = value ? value[id] || "" : "";
						widget._children[j].setDetachedAttributes(nodes[j], {value:widget_value});
						box.append(nodes[j]);
					}
					nodes = box;
				}
				else
				{
					widget.setDetachedAttributes(nodes, {value:value});
				}
			}
			jQuery(this).append(nodes);
		});
		jQuery(tr).append(row.children());

		return tr;
	},

	/**
	 * How to tell if the row needs a diff widget or not
	 *
	 * @param {string} columnName
	 * @param {string} value
	 * @returns {Boolean}
	 */
	_needsDiffWidget: function(columnName, value) {
		if(typeof value !== "string" && value)
		{
			this.egw().debug("warn", "Crazy diff value", value);
			return false;
		}
		return value === '***diff***';
	},

	/**
	 * Make a single row's new value cell span across both new value and old value
	 * columns.  Used for diff widget.
	 *
	 * @param {jQuery} row jQuery wrapped row node
	 */
	_spanValueColumns: function(row)
	{
		// Stretch column 4
		row.parents("td").attr("colspan", 2)
			.css("border-right", "none");
		row.css("width", (
				this.dataview.columnMgr.columnWidths[this.NEW_VALUE] +
				this.dataview.columnMgr.columnWidths[this.OLD_VALUE]-10)+'px');

		// Skip column 5
		row.parents("td").next().remove();
	},

	resize: function (_height)
	{
		if (typeof this.options != 'undefined' && _height
				&& typeof this.options.resize_ratio != 'undefined')
		{
			// apply the ratio
			_height = (this.options.resize_ratio != '')? _height * this.options.resize_ratio: _height;
			if (_height != 0)
			{
				// 250px is the default value for history widget
				// if it's not loaded yet and window is resized
				// then add the default height with excess_height
				if (this.div.height() == 0) _height += 250;
				this.div.height(this.div.height() + _height);

				// trigger the history registered resize
				// in order to update the height with new value
				this.div.trigger('resize.' +this.options.value.app + this.options.value.id);
			}
		}
		if(this.dynheight)
		{
			this.dynheight.update();
		}
		// Resize diff widgets to match new space
		if(this.dataview)
		{
			var columns = this.dataview.getColumnMgr().columnWidths;
			jQuery('.et2_diff', this.div).parent().width(columns[this.NEW_VALUE] + columns[this.OLD_VALUE]);
		}
	}
});}).call(this);
et2_register_widget(et2_historylog, ['historylog']);