'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: BI Dashboard
 *| (C) Copyright IBM Corp. 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', '../../../lib/@waca/upgrades/UpgradeBase'], function (Class, UpgradeBase) {

	var Upgrade = Class.extend([UpgradeBase], {
		init: function init() {},

		/**
   * Perform upgrade
   *
   * @param {object} spec - spec to perform upgrade on
   *
   * @return {Promise} Promise to be resolved when upgrade performed
   */
		up: function up(spec) {
			if (!spec) {
				return Promise.resolve(spec);
			}

			// for safety, make sure we're upgrading the right thing
			var containsInfographic = this._containsInfographic(spec.layout.templateName);

			if (!containsInfographic) {
				return Promise.resolve(spec);
			}

			var templateName = spec.layout.templateName;

			delete spec.layout.templateName;
			spec.layout.type = 'singlePage';

			// note: infographics have only one page
			spec.layout.items[0].title = 'Untitled 1';
			spec.layout.items[0].templateName = templateName;

			return Promise.resolve(spec);
		},

		down: function down(spec) {

			if (!spec) {
				return Promise.resolve(spec);
			}

			// for safety, make sure we're upgrading the right thing
			var containsInfographic = this._containsInfographic(spec.layout.items[0].templateName);

			if (!containsInfographic) {
				return Promise.resolve(spec);
			}

			var templateName = spec.layout.items[0].templateName;

			spec.layout.templateName = templateName;
			spec.layout.type = 'container';

			delete spec.layout.items[0].title;
			delete spec.layout.items[0].templateName;

			return Promise.resolve(spec);
		},

		/**
   * Check whether the spec contains an infographic layout
   *
   * @param {object} templateName - template name (ex: Infographics1)
   *
   * @return {boolean}
   */
		_containsInfographic: function _containsInfographic(templateName) {

			if (!templateName) {
				return false;
			}

			// startsWith('Infographics')
			return templateName.lastIndexOf('Infographics', 0) === 0;
		}
	});

	return new Upgrade();
});
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