'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Dashboard
 * (C) Copyright IBM Corp. 2018, 2020
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 *
 */
define(['underscore', '../../../visualizations/renderer/sequence/BaseTask', './SummaryTypes'], function (_, BaseTask, SummaryTypes) {
	'use strict';

	/**
  * @class SummaryTask
  * Task to run the summary queries as part of the render sequence
  */

	var SummaryTask = BaseTask.extend({

		init: function init(options, moduleOptions) {
			SummaryTask.inherited('init', this, arguments);
			this.feature = moduleOptions.summaryFeature;
			this.visualization = moduleOptions.visualization;
			this.content = moduleOptions.content;
		},

		/**
   * @private
   * @function _requiresSummaryQuery
   * Check if the current data mapping requires a summary query
   * @return {boolean} true if visualization requires a summary query based on the current mapping, otherwise false
   */
		_requiresSummaryQuery: function _requiresSummaryQuery() {
			// Check the visualization property first if it requires summaries
			var v2QuerySupported = this.content.getFeature('Visualization').getType() === 'Crosstab';
			if (v2QuerySupported || this.feature.isNotSupported() || this.content.getPropertyValue('hideSummaries') === true) {
				return false;
			}

			// We assume the SummaryTask is created because
			// the visualization supports summary queries
			// question is it required to do sumbit a summary query
			return _.find(this.visualization.getSlots().getMappedSlotList(), function (slotAPI) {
				return _.find(slotAPI.getDataItemList(), function (dataItemAPI) {
					if (dataItemAPI.getType() === 'fact' && slotAPI.getDefinition().getProperty('summaryValues')) {
						return SummaryTypes.indexOf(dataItemAPI.getAggregation()) > -1;
					}
				});
			}) ? true : false;
		},

		/**
   * @public
   * @override
   * @function process
   * Process the summaries
   * @param {Object} renderContext - The render renderContext
   * @returns {Promise} - Promise which resolves when the task is finished
   */
		process: function process(renderContext) {
			var _this = this;

			if (this._isStepComplete(renderContext, this.getId())) {
				return Promise.resolve(renderContext);
			}

			if (this._requiresSummaryQuery()) {
				this._queryExecution = this._queryExecution || this.content.getFeature('DataQueryExecution');
				this._queryModifier = this._queryModifier || this.content.getFeature('SummaryQueryModifier');
				this._queryModifier.resetDataItemIdList();
				var projectionsList = this._getProjectionList();
				_.each(projectionsList, function (projections, idx) {
					_this._queryModifier.addDataItemIdList(projections);
					_this.feature.addSummaryQueryResult(idx, _this._queryExecution.executeQueries('summary'));
				});
			}
			this._completeStep(renderContext, this.getId(), arguments);
			return Promise.resolve(renderContext);
		},

		/**
   * @private
   * Assemble the query projections from category and measure unique ids.
   * @returns {string[]} An array of arrays corresponding to the summary query projection list.
   * @example 
   * oQueryProjections = {
   * 	aCategoryUIds: [[A],[AB],[ABC],[D],[DE],[EDF],[AD],[ADE],[ADEF],[ABD],[ABDE],[ABDEF],[ABCD],[ABCDE]],
   * 	aOrdinalUIds: [G, H]
   * }
   * result = [
  		['A','G','H'],
  		['A','B','G','H'],
  		['A','B','C','G','H'],
  		['D','G','H'],
  		['D','E','G','H'],
  		['D','E','F','G','H'],
  		['A','D','G','H'],
  		['A','D','E','G','H'],
  		['A','D','E','F','G','H'],
  		['A','B','D','G','H'],
  		['A','B','D','E','G','H'],
  		['A','B','D','E','F','G','H'],
  		['A','B','C','D','G','H'],
  		['A','B','C','D','E','G','H'],
  		['G','H']
  	]
   */
		_getProjectionList: function _getProjectionList() {
			var oQueryProjections = this.feature && this.feature.getProjectionListObj();
			if (_.isEmpty(oQueryProjections)) {
				return [];
			}
			var aSummaryQueryProjections = _.map(oQueryProjections.aCategoryUIds, function (uIds) {
				return uIds.concat(oQueryProjections.aOrdinalUIds);
			});

			aSummaryQueryProjections.push(oQueryProjections.aOrdinalUIds); // The last query is the overall summary query.
			return aSummaryQueryProjections;
		}
	});

	return SummaryTask;
});
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