'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: Dashboard
 *| (C) Copyright IBM Corp. 2017, 2020
 *|
 *| US Government Users Restricted Rights - Use, duplication or disclosure
 *| restricted by GSA ADP Schedule Contract with IBM Corp.
 *+------------------------------------------------------------------------+
 */

define(['gemini/lib/@waca/dashboard-common/dist/core/Model', 'underscore'], function (Model, _) {
	'use strict';
	/**
  * The fredIsRedModel implements the boardModelExtension defined in fredIsRed.json
  * It is used to persist information about mapped colours etc.
  */

	var FredIsRedModel = Model.extend({
		// constructor
		/**
   * The fredIsRedModel will persist a saveId (incremented each time a user saves)
   * and a colorMap (with the labels/virtual palette indexes selected based on the data).
   * The saveId can be used to optimize the table on save (though this is not yet implemented)
   */
		whitelistAttrs: ['id', 'colorMap', 'saveId'],

		//Pick a 'virtual palette size' that is larger than all palettes (Most palettes are multiples of 4 so a multiple of 4 has been chosen).
		_VIRTUAL_PALETTE_SIZE: 48,

		init: function init(params) {
			FredIsRedModel.inherited('init', this, arguments);
			this.colorMap = params && params.colorMap || {};
			this.saveId = params && params.saveId || 0;
		},

		destroy: function destroy() {
			FredIsRedModel.inherited('destroy', this, arguments);
		},

		/**
   * @returns the colorMap property of the fredIsRed model
   */
		getColorMap: function getColorMap() {
			return this.get('colorMap') || {};
		},

		/**
   * Find a colorIndex in a virtual palette for the passed in label.
   *
   * whose value is a colour index in 'virtual palette domain' and tag it with the saveId.
   * @param label - a label to add an entry for.
   */
		getColorIndex: function getColorIndex(label) {
			var colorMapEntry = this.colorMap[label];
			var colorIndex = colorMapEntry && colorMapEntry.v;
			if (colorIndex === undefined) {
				colorIndex = _.keys(this.colorMap).length % this._VIRTUAL_PALETTE_SIZE;
				this.colorMap[label] = { v: colorIndex, s: this.saveId };
			} else {
				colorMapEntry.s = this.saveId;
			}
			return colorIndex;
		},

		/**
   * Keep track of what values have been used by associating a value with a saveId.
   */
		updateSaveId: function updateSaveId() {
			this.saveId = (this.get('saveId') || 0) + 1;
		},

		/**
   * setUserMap - sets color map - not used atm, exists for completeness
   * @param colorMap
   */
		setColorMap: function setColorMap(colorMap) {
			this.set('userPalette', colorMap);
		}
	});

	return FredIsRedModel;
});
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