'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: BI Dashboard
 *| (C) Copyright IBM Corp. 2016, 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', 'underscore'], function (Class, UpgradeBase, _) {

	var Upgrade = Class.extend([UpgradeBase], {
		init: function init() {
			this.VERSION = 6;
		},

		/**
   * 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);
			}

			// Upgrade dataset shaping
			this._upgradeDatasetShaping(spec);

			// Upgrade widget spec;
			_.each(spec.widgets, this._upgradeWidgetSpec.bind(this));

			return Promise.resolve(spec);
		},

		_upgradeDatasetShaping: function _upgradeDatasetShaping(oBoardSpec) {
			var datasetShaping = oBoardSpec.datasetShaping;
			var widgets = oBoardSpec.widgets;
			//Update model mappings attributes
			if (!datasetShaping || !widgets) {
				return false; //Upgrade is not needed
			}
			var bUpgraded = false;
			var aDatasets = [];
			//Local cache all distinct data sets with type info
			var sID = null;
			_.each(widgets, function (widget) {
				if (widget.dataSet) {
					sID = widget.dataSet.id;
					if (sID && aDatasets.indexOf(sID) === -1) {
						aDatasets.push({
							id: sID,
							type: widget.dataSet.type
						});
					}
				}
			});
			//Upgrade data sets shaping
			var oDataset = null;
			_.each(datasetShaping, function (shaping) {
				if (shaping) {
					oDataset = _.find(aDatasets, function (dataset) {
						return dataset.id === shaping.id;
					});
					if (oDataset) {
						var options = { 'isUploadedFile': oDataset.type === 'uploadedFile' };
						_.each(shaping.filters, function (filter) {
							filter.columnId = this._getShortenedColID(filter.columnId, options);
							bUpgraded = true;
						}.bind(this));
					}
				}
			}.bind(this));

			return bUpgraded;
		},

		_upgradeWidgetSpec: function _upgradeWidgetSpec(widgetModel) {
			if (!widgetModel || !widgetModel.dataSet) {
				return false; //Upgrade is not needed
			}
			var options = {
				isUploadedFile: widgetModel.dataSet.type === 'uploadedFile'
			};
			_.each(widgetModel.mapping, function (mapping) {
				if (mapping.id) {
					mapping.id = this._getShortenedColID(mapping.id, options);
				}
				if (mapping.columnId) {
					mapping.columnId = this._getShortenedColID(mapping.columnId, options);
				}
			}.bind(this));
			//Update model filters attributes
			_.each(widgetModel.filters, function (filter) {
				this._upgradeFilters(filter, options);
			}.bind(this));
			//Update model local filters attributes
			_.each(widgetModel.localFilters, function (filter) {
				this._upgradeFilters(filter, options);
			}.bind(this));
			return widgetModel;
		},

		_upgradeFilters: function _upgradeFilters(filter, options) {
			if (!filter) {
				return;
			}

			if (filter.columnId) {
				filter.columnId = this._getShortenedColID(filter.columnId, options);
			} else if (filter.values) {
				_.each(filter.values, function (value) {
					this._upgradeFilters(value, options);
				}.bind(this));
			}
		},

		down: function down(spec) {
			// no downgrade at this time; return as is
			return Promise.resolve(spec);
		},

		/**
   * @private
   * Migrate the older release long format column ID to a shortened version in the new release
   **/
		_getShortenedColID: function _getShortenedColID(sOrigID, options) {
			if (sOrigID && sOrigID.length > 0) {
				var aSections = sOrigID.split('.');
				var nLen = aSections.length;
				if (options && options.isUploadedFile === true) {
					return 'Sheet1.' + aSections[nLen - 1];
				} else if (nLen >= 2) {
					var aResult = [];
					aResult.push(aSections[nLen - 2]);
					aResult.push(aSections[nLen - 1]);
					return aResult.join('.'); //Shortened version
				}
			}
			return sOrigID;
		}
	});

	return new Upgrade();
});
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