'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2017, 2018
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['underscore', '../../lib/@waca/core-client/js/core-client/ui/core/Class'], function (_, Class) {

	'use strict';

	var VisSelectionInfo = Class.extend({
		init: function init() {
			this._aOrdinalSelections = [];
			this._aCategorySelections = [];
			this._slotToCategoryCount = {};
		},

		getCategorySelections: function getCategorySelections() {
			return this._aCategorySelections;
		},

		getOrdinalSelections: function getOrdinalSelections() {
			return this._aAdditionalOrdinalSelections ? this._aOrdinalSelections.concat(this._aAdditionalOrdinalSelections) : this._aOrdinalSelections;
		},

		_createSelectionObject: function _createSelectionObject(slot, slotDataItem, value, isEdgeSelection) {
			return {
				'slot': slot,
				'slotDataItem': slotDataItem,
				'value': value,
				// TODO should use the same name tag 'isEdgeSelect' as event target classes
				'isEdgeSelection': isEdgeSelection || this._isEdgeSelection(slot)
			};
		},

		addSelection: function addSelection(slot, slotDataItem, value, isEdgeSelection) {
			var slotType = slotDataItem.getType();

			if (!this._ordinalSelectionAdded(slot, slotDataItem, slotType)) {
				this[slotType === 'fact' ? '_aOrdinalSelections' : '_aCategorySelections'].push(this._createSelectionObject(slot, slotDataItem, value, isEdgeSelection));
				this._registerCategoryCount(slotType, slot, slotDataItem);
			} else if (slotType === 'fact') {
				//In the case of 'multiTuple' (lasso select), we want to capture all of the values of the ordinals not just one.
				this._aAdditionalOrdinalSelections = this._aAdditionalOrdinalSelections || [];
				this._aAdditionalOrdinalSelections.push(this._createSelectionObject(slot, slotDataItem, value, isEdgeSelection));
			}
		},

		_isEdgeSelection: function _isEdgeSelection(slot) {
			return slot.getDefinition() && slot.getDefinition().treatOrdinalAsCategory ? slot.getDefinition().treatOrdinalAsCategory : false;
		},

		/**
   * Special handling for stacked dataItems on chart edges.
   * For nested dataPoints (stacked items) VIPR returns a list of selection entries pairing the same measure values
   * with each entry in the stacked item.  We only want it in selection info if it hasn't already been added.
   *	items: [
   *	{values: ['web', $5000],
   *	{values: [{camping, $5000]
   *	]
   */
		_ordinalSelectionAdded: function _ordinalSelectionAdded(slot, slotDataItem, slotType) {
			var ordinalSelectionFound = false;
			if (slotType === 'fact') {
				ordinalSelectionFound = _.find(this._aOrdinalSelections, function (ordinalSelection) {
					return ordinalSelection.slot.getId() === slot.getId() && ordinalSelection.slotDataItem.getId() === slotDataItem.getId();
				}) ? true : false;
			}
			return ordinalSelectionFound;
		},

		_registerCategoryCount: function _registerCategoryCount(slotType, slot, slotDataItem) {
			if (slotType !== 'fact') {
				var countEntry = this._slotToCategoryCount[slot.getId()] || { count: 0, dataItems: [] };
				if (countEntry.dataItems.indexOf(slotDataItem.getId()) === -1) {
					countEntry.count += 1;
					countEntry.dataItems.push(slotDataItem.getId());
					this._slotToCategoryCount[slot.getId()] = countEntry;
				}
			}
		},

		getCategorySetSize: function getCategorySetSize() {
			var size = 0;
			var categoryCount = _.reduce(this._slotToCategoryCount, function (totalCat, slot) {
				return totalCat + slot.count;
			}, 0);

			if (this._aCategorySelections.length) {
				size = this._aCategorySelections.length / categoryCount;
			}
			return size;
		}

	});

	return VisSelectionInfo;
});
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