'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Storytelling
 * (C) Copyright IBM Corp. 2017, 2019
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

define(['underscore'], function (_) {
	return {
		init: function init(model, spec /*, boardModel, logger*/) {
			if (spec.hasOverview && typeof spec.showOverviews === 'undefined') {
				var defaultSpec = {
					showStart: true,
					showEnd: true
				};
				model.showOverviews = spec.showOverviews = defaultSpec;
			}
		},

		/**
   * Update the showOverviews property of a model. This function will merge the provided showOverviews with the existing ones
   * @param model LayoutModel instance to update
   * @param showOverviews  - object containing the showOverviews that we would like to update
   * @returns a payload useful to the LayoutMmodel._callExtensionMethod method
   */
		update: function update(model, showOverviews) {
			if (!showOverviews) {
				return null;
			}
			if (!model.showOverviews) {
				model.showOverviews = {};
			}
			var prev = _.clone(model.showOverviews);
			_.extend(model.showOverviews, showOverviews);
			return {
				event: 'change:showOverviews',
				value: showOverviews,
				previousValue: prev
			};
		}
	};
});
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