'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2015, 2017
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

define(['../../lib/@waca/core-client/js/core-client/ui/core/Class', 'underscore'], function (Class, _) {

	/**
  * Service which facilitates access to contents of the dasboard spec.
  */
	var Svc = Class.extend({

		init: function init(boardModel) {
			this.boardModel = boardModel;

			//The filterContextAdapters map is responsible for providing functions that convert
			//widgetInstance type-specific filters to a portable form needed by the getFilterContext api.
			//Currently there is only one type so the function is provided.  In future, this map could be extended or, to be more dynamic
			//callers could register their converters
			this._filterContextAdapters = {
				'data': this._convertDataWidgetFilterContext
				//more converters should be referenced by widgetInstance type here.
			};
		},

		/**
   * Return mappings that match the condition in the supplied matching function as well as the dataset and optional page specified.
   * @param cbMappingMatches a matching function supplied by the caller....only mappings that succeed will be returned.
   * @param dataSetId A datasetId that any returned mappings must belong to.
   * @param containerPageId (optional) - Only mappings for widgets on the specified page will be processed (pageId is a string eg 'page1')
   * @returns an array of mappings that match the criteria defined in the callback function cbMappingMatches
   *
   */
		getMappings: function getMappings(cbMappingMatches, dataSetId, containerPageId) {
			var returnMappings = [];

			if (!this.boardModel) {
				return returnMappings;
			}

			var fAddMapping = function fAddMapping(mapping) {
				if (cbMappingMatches(mapping)) {
					returnMappings.push(mapping);
				}
			};

			_.keys(this.boardModel.widgetInstances).forEach(function (widgetInstanceModel) {
				var widgetInstance = this.boardModel.widgetInstances[widgetInstanceModel];

				var mappings = widgetInstance.mapping;
				if (mappings && !Array.isArray(mappings)) {
					mappings = [mappings];
				}

				var dataSetMatches = widgetInstance.dataSet && widgetInstance.dataSet.id === dataSetId;
				if (dataSetMatches && mappings) {
					//If containerPageId is not specified, all pages match.
					var pageIdMatches = !containerPageId;
					if (!pageIdMatches) {
						var pageForWidget = this.boardModel.layout.findTopLevelParentItem(widgetInstance.id);
						pageIdMatches = pageForWidget && pageForWidget.id === containerPageId;
					}

					if (pageIdMatches) {
						_.each(mappings, fAddMapping);
					}
				}
			}, this);

			return returnMappings;
		},

		/**
   * Return an array of filterContexts in 'portable form' for all widgets that match the dataset and optional eventGroupId specified.
   * Since the datawidget is the only widget instance type with a filter context, portable form is the JSON format
   * it serializes but this is likely to change in future as new widgets capable of contributing to filter context are implemented (ie: visControl widget)
   *
   * For each widget, the array would be.
   * {
   *		id: %widgetId%,
   *		dataSet: %dataSetId,url%,
   *		filterContext: { %portablefilterDefinition }
   * }
   *
   * @param dataSetId (optional) - include the filter context for widgets that match this dataSetId (widgets for all dataSets if null).
   * @param eventGroupId (optional) - include the filter context for widgets on this event group (widgets for all groups if null).
   * @returns the array as described for widgets that match the dataSetId and containerPageId constraints.
  */
		getFilterContext: function getFilterContext(dataSetId, eventGroupId) {
			var returnResults = [];

			if (!this.boardModel) {
				return returnResults;
			}

			_.keys(this.boardModel.widgetInstances).forEach(function (widgetInstanceModel) {
				var widgetInstance = this.boardModel.widgetInstances[widgetInstanceModel];

				var filterContextAdapter = this._filterContextAdapters[widgetInstance.type];
				var dataSetMatches = !dataSetId || widgetInstance.dataSet && widgetInstance.dataSet.id === dataSetId;
				if (dataSetMatches && filterContextAdapter) {
					//If eventGroupId is not specified, all groups match.
					var groupIdMatches = !eventGroupId;
					if (!groupIdMatches) {
						var eventGroup = this.boardModel.eventGroups.findGroup(widgetInstance.id);
						groupIdMatches = eventGroup && eventGroup.id === eventGroupId;
					}

					if (groupIdMatches) {
						returnResults.push(filterContextAdapter(widgetInstance));
					}
				}
			}, this);

			return returnResults;
		},

		/**
   * This function is responsible for returning the filterContext in the form required by getFilterContext
   * for the data widget.  If other widget types require returning
   * @param widgetInstance - the widgetInstance
   * @returns the filterContext structure which includes a filter specification in portable form that any widget type should be able
   * to interpret.
   */
		_convertDataWidgetFilterContext: function _convertDataWidgetFilterContext(widgetInstance) {
			return {
				id: widgetInstance.id,
				dataSet: widgetInstance.dataSet,
				filterContext: widgetInstance.filters
			};
		}
	});
	return Svc;
});
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