'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: BI Dashboard
 *| (C) Copyright IBM Corp. 2016, 2018
 *|
 *| 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', '../../../lib/@waca/core-client/js/core-client/errors/BaseError', 'underscore'], function (Class, UpgradeBase, BaseError, _) {

	var Upgrade = Class.extend([UpgradeBase], {
		init: function init() {
			this.VERSION = 1002;
		},

		_getSourcesInfo: function _getSourcesInfo(boardSpec) {
			// Get datasets involved in widgets.
			// I assume that dataset shaping can not reference a dataset that is not used in widget.
			var datasetInfos = [];
			_.each(boardSpec.widgets, function (widgetSpec) {
				if (widgetSpec.dataSet) {
					var datasetType = widgetSpec.dataSet.type;
					var datasetId = widgetSpec.dataSet.id;
					if (('uploadedFile' === datasetType || 'dataSet2' === datasetType) && !_.findWhere(datasetInfos, {
						id: datasetId
					})) {
						datasetInfos.push({
							id: datasetId,
							type: datasetType
						});
					}
				}
			});
			if (datasetInfos.length === 0) {
				return datasetInfos;
			}

			return datasetInfos;
		},

		/**
   * 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);
			}
			return this._updateColumnIdForUploadedFileAndDataset2(spec).catch(function (error) {
				if (this.data.logger) {
					this.data.logger.error(error);
				} // catch and report the error, but don't fail, return the old spec.
				return spec;
			}.bind(this));
		},

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

		// Replace "Sheet1." in columnId by the query subject identifier + '.' in uploadedFile and dataset2.
		_updateColumnIdForUploadedFileAndDataset2: function _updateColumnIdForUploadedFileAndDataset2(boardSpec) {
			var promise = null;
			var datasetInfos = this._getSourcesInfo(boardSpec);
			// Get metadata of datasets to retrieve the query subject identifier in these datasets
			if (datasetInfos.length > 0) {
				boardSpec.queriedForUpgrade = true;
				var metadataPromises = [];
				_.each(datasetInfos, function (datasetInfo) {
					metadataPromises.push(this._getMetadata(datasetInfo));
				}.bind(this));

				// Upgrade identifiers in widgets and dataset shaping
				promise = Promise.all(metadataPromises).then(function () {
					this._updateColumnIds(datasetInfos, boardSpec);
					return boardSpec;
				}.bind(this), function (error) {
					throw error;
				});
			} else {
				promise = Promise.resolve();
			}
			return promise;
		},

		_updateColumnIds: function _updateColumnIds(datasetInfos, boardSpec) {
			// update in widgets
			_.each(boardSpec.widgets, function (widgetSpec) {
				var datasetInfo = widgetSpec.dataSet ? _.findWhere(datasetInfos, {
					id: widgetSpec.dataSet.id
				}) : null;
				if (datasetInfo) {
					this._updateColumnIdInWidget(datasetInfo.querySubjectId, widgetSpec);
				}
			}.bind(this));
			// update in datasetShaping
			_.each(boardSpec.datasetShaping, function (shaping) {
				var datasetInfo = _.findWhere(datasetInfos, {
					id: shaping.id
				});
				if (datasetInfo) {
					this._updateColumnIdInShaping(datasetInfo.querySubjectId, shaping);
				}
			}.bind(this));
		},

		_updateColumnIdInWidget: function _updateColumnIdInWidget(qsId, widgetModel) {
			// update widget mapping
			_.each(widgetModel.mapping, function (mapping) {
				if (mapping.columnId) {
					mapping.columnId = this._replaceQuerySubjectId(mapping.columnId, qsId);
				}
			}.bind(this));
			// Update model filters attributes
			_.each(widgetModel.filters, function (filter) {
				this._updateEdgeOrDataPointFilter(filter, qsId);
			}.bind(this));
			// Update model local filters
			_.each(widgetModel.localFilters, function (filter) {
				this._updateEdgeOrDataPointFilter(filter, qsId);
			}.bind(this));
		},

		_updateEdgeOrDataPointFilter: function _updateEdgeOrDataPointFilter(filter, qsId) {
			if (filter.columnId) {
				filter.columnId = this._replaceQuerySubjectId(filter.columnId, qsId);
			}
			if (filter.values) {
				this._updateColumnIdInFilterValues(filter.values, qsId);
			}
		},

		_updateColumnIdInShaping: function _updateColumnIdInShaping(qsId, shaping) {
			// Update columnId in shaping calculations
			_.each(shaping.calculations, function (calculation) {
				if (calculation.expr && calculation.expr.params && calculation.expr.params.length > 0) {
					_.each(calculation.expr.params, function (param) {
						if (param.col) {
							param.col = this._replaceQuerySubjectId(param.col, qsId);
						}
					}.bind(this));
				}
			}.bind(this));
			// Update columnId in shaping filters
			_.each(shaping.filters, function (filter) {
				if (filter.columnId) {
					filter.columnId = this._replaceQuerySubjectId(filter.columnId, qsId);
				}
			}.bind(this));
		},

		_replaceQuerySubjectId: function _replaceQuerySubjectId(oldColumnId, qsId) {
			return oldColumnId.replace('Sheet1.', qsId);
		},

		_updateColumnIdInFilterValues: function _updateColumnIdInFilterValues(values, qsId) {
			_.each(values, function (value) {
				if (value.columnId) {
					value.columnId = this._replaceQuerySubjectId(value.columnId, qsId);
				}
				if (value.values) {
					this._updateColumnIdInFilterValues(value.values, qsId);
				}
			}.bind(this));
		},

		// Call REST-API to get metadata.
		// As this upgrade happens before the upgrade of shaping and widget spec, I use Moser REST-API
		// to get metadata and the dataset Id is the storeID of the dataset in the old spec.
		_getMetadata: function _getMetadata(datasetInfo) {

			return new Promise(function (resolve, reject) {
				try {
					var datasetId = datasetInfo.id;
					this.data.ajaxSvc.ajax({
						url: 'v1/metadata/base_modules/' + datasetId + '/metadata?shortIdForExpression=true&item=on&type=' + datasetInfo.type,
						type: 'GET',
						headers: {
							'Accept': 'application/json'
						}
					}).then(function (response) {
						var _response$data = response.data,
						    data = _response$data === undefined ? {} : _response$data;
						// Get the query subject identifier from the metadata response

						if (data.querySubject && data.querySubject.length > 0) {
							datasetInfo.querySubjectId = data.querySubject[0].identifier + '.';
						}
						resolve(data);
					}.bind(this), function (jqXHR) {
						if (this.data.logger) {
							this.data.logger.error('Error calling Modeling service API to get metadata');
						}
						var errorMsg = '';
						if (jqXHR.responseText) {
							errorMsg = jqXHR.responseText;
							if (this.data.logger) {
								this.data.logger.error(errorMsg);
							}
						}
						reject(new BaseError(errorMsg));
					}.bind(this));
				} catch (error) {
					reject(error);
				}
			}.bind(this));
		}
	});

	return new Upgrade();
});
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