'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Dashboard
 * (C) Copyright IBM Corp. 2013, 2019
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 *
 * VisQueryBuilder
 * The VisQueryBuilder is responsible for turning the information in the dataMappingManager into a DSS query.
 */

define(['underscore', '../../../lib/@waca/core-client/js/core-client/ui/core/Class', './VisQueryDataItemBuilder', './QueryFilterSpec', './VisQueryDefinition'], function (_, Class, VisQueryDataItemBuilder, QueryFilterSpec, VisQueryDefinition) {

	'use strict';

	var VisQueryBuilder = null; // class declaration

	VisQueryBuilder = Class.extend({

		init: function init(attributes) {
			console.debug('visQueryBuilder (lw) init');
			VisQueryBuilder.inherited('init', this, arguments);

			_.forEach(attributes, function (attribute, key) {
				this[key] = attribute;
			}.bind(this));

			this.visQueryDataItemBuilder = new VisQueryDataItemBuilder({ visAPI: attributes.visAPI });
		},

		/**
   * create a visualization query
   * @param queryContext - the context of the query.
   * @returns the queryDefinition in a form that can be executed.
   */
		create: function create(queryContext) {
			var aMappedLayers = [];
			var oLayers = this._getQueryLayers();
			if (oLayers) {
				_.each(oLayers.getLayers(), function (layer) {
					if (this.visAPI.isMappingComplete(layer.id)) {
						aMappedLayers.push(layer);
					}
				}.bind(this));
			}
			if (aMappedLayers.length === 0) {
				aMappedLayers.push(this.visAPI.getDefaultLayer());
			}
			queryContext.visibleItemsMap = this._createVisibleItemsMapFromLiveWidgetModel();

			var aDataItems = this._createQueryDataItemsFromLiveWidgetModel(queryContext);
			var aProjections = this._createQueryProjectionsFromLiveWidgetModel(queryContext);

			//Mapping of all the projected data items (necessary for local filters)
			queryContext.projectedDataItemsMap = this._createVisibleItemsMapFromLiveWidgetModel(true);

			//Remove aFields, it should not be needed.
			var aFields = this._createQueryDefinitionFieldsFromLiveWidgetModel();
			var aFilters = this.createLocalFilters(queryContext, aMappedLayers);
			var aQueryHints = this._createQueryHints(queryContext);

			var oVisQueryDefinition = new VisQueryDefinition({ 'layers': aMappedLayers,
				'layeredEntities': {
					'dataItems': aDataItems,
					'projections': aProjections,
					'fields': aFields,
					'filters': aFilters
				},
				'commonEntities': {
					'queryHints': aQueryHints
				} });
			return oVisQueryDefinition;
		},

		/**
   * Turn on multiEdgeSort based on following rules:
   * 1: if slot is isMultiMeasuresSeries and is Rank, does not consider as edge
   * 2: if slot is isMultiMeasuresSeries and is stacked, considered as one edge
   * 3: if slot is stacked, it is considered as one edge
   * 4: if slot is of type ordinal, does not consider as edge
   * if number of edges is more than one, then turn on multiEdgeSort otherwise not
   * @param queryHints the queryHint for query
   * @return {boolean} true if number of edges to sort is more than 1.
   * @private
   */
		_queryHintMultiEdgeSort: function _queryHintMultiEdgeSort(queryHints) {
			var _this = this;

			var numberOfEdges = 0;
			if (queryHints && !queryHints.multiEdgeSort) {
				return false;
			}
			_.forEach(this.visAPI.getDataSlots(), function (slotAPI) {
				if (_this._canQuery(slotAPI) && slotAPI.getFinalSlotType() !== 'ordinal' && slotAPI.getDataItemAPIs().length > 0) {
					numberOfEdges++;
				}
			});
			return numberOfEdges > 1;
		},

		_createQueryHints: function _createQueryHints(queryContext) {
			var queryHints = {};
			if (queryContext.entities && queryContext.entities.definition && queryContext.entities.definition.queryHints) {
				_.extend(queryHints, queryContext.entities.definition.queryHints);
			}

			if (queryContext.entities.preferredModelItems && queryContext.entities.preferredModelItems.length) {
				queryHints.preferredModelItems = queryContext.entities.preferredModelItems;
			}

			// Multi edge sort is only required by the main data query
			// and is not required by auxiliary queries such as summary queries (for performance reasons)
			if (queryContext.auxQuery || !this._queryHintMultiEdgeSort(queryHints)) {
				delete queryHints.multiEdgeSort;
			}

			if (queryContext.renderContext && queryContext.renderContext.extraInfo && queryContext.renderContext.extraInfo.sender === 'realtimeRefresh') {
				// Set the dataCacheExpiry to 40% of the refresh time
				var refreshValue = queryContext.renderContext.extraInfo.queryRefresh && queryContext.renderContext.extraInfo.queryRefresh.value;
				var dataCacheExpiryValue;
				switch (queryContext.renderContext.extraInfo.queryRefresh && queryContext.renderContext.extraInfo.queryRefresh.unit) {
					case 'seconds':
						dataCacheExpiryValue = parseInt(refreshValue * 4 / 10) || 1;
						break;
					case 'minutes':
						dataCacheExpiryValue = parseInt(refreshValue * 60 * 4 / 10) || 1;
						break;
					case 'hours':
						dataCacheExpiryValue = parseInt(refreshValue * 3600 * 4 / 10) || 1;
						break;
					default:
						dataCacheExpiryValue = 1;
				}
				queryHints.dataCacheExpiry = dataCacheExpiryValue.toString();
			} else {
				switch (queryContext.entities && queryContext.entities.properties && queryContext.entities.properties.localCache) {
					case 'yes':
						queryHints.dataCacheExpiry = '3600';
						break;
					case 'no':
						queryHints.dataCacheExpiry = '0';
						break;
					default:
				}
			}
			return [queryHints];
		},

		//TODO: Remove the function and sub functions when 'fields' is not needed in the flow for Endor
		_createQueryDefinitionFieldsFromLiveWidgetModel: function _createQueryDefinitionFieldsFromLiveWidgetModel() {
			var fields = [];
			var slotAPIs = this._getQuerySlots();
			_.each(slotAPIs, function (slotAPI) {
				fields = fields.concat(this._slotToFields(slotAPI));
			}.bind(this));
			return fields;
		},

		_createQueryDataItemsFromLiveWidgetModel: function _createQueryDataItemsFromLiveWidgetModel(queryContext) {
			var slotAPIs = this._getQuerySlots();
			// Set slot sort priority to highest data items sort priority plus 1.
			var priority = 0;
			var aDataItems = [];
			_.each(slotAPIs, function (slotAPI) {
				_.each(slotAPI.getDataItemAPIs(), function (dataItemAPI) {
					var sortObj = dataItemAPI.getSort();
					if (sortObj && priority < sortObj.priority) {
						priority = sortObj.priority;
					}
				});
			});

			this.visQueryDataItemBuilder.setQuerySlotSortPriority(priority + 1);

			var multiMeasures = this.visAPI.findSlotDataItem(function (dataItemAPI) {
				return dataItemAPI.getItemId() === '_multiMeasuresSeries';
			});

			// If multi measures are dropped to one slot, should not do client (local) sort.
			var serverSort = multiMeasures ? true : false;
			this.visQueryDataItemBuilder.setServerSort(serverSort);

			_.each(slotAPIs, function (slotAPI) {
				aDataItems = aDataItems.concat(this._slotToDataItems(slotAPI, queryContext));
			}.bind(this));

			if (queryContext && queryContext.queryOptions) {
				// list of dataitems to be added to the generated dataitems list
				if (queryContext.queryOptions.extraDataItems) {
					aDataItems = aDataItems.concat(queryContext.queryOptions.extraDataItems);
				}
				// list of dataitem ids to be removed from the generated dataitems list
				if (typeof queryContext.queryOptions.filterDataItems === 'function') {
					aDataItems = _.filter(aDataItems, queryContext.queryOptions.filterDataItems);
				}
			}
			return aDataItems;
		},

		/**
   * @param {boolean} includeAllDataItems As long as it can query, it will add the data items
   * This is for local filters, where we need all the project data items to pass.
   */

		//Use the slots and assigned dataItems to create a map of all visible items in this visualization.
		_createVisibleItemsMapFromLiveWidgetModel: function _createVisibleItemsMapFromLiveWidgetModel(includeAllDataItems) {
			var visibleItemsMap = {};
			this.visAPI.eachSlotDataItem(function (dataItemAPI, slotAPI) {
				// Exclude ordinal data items in visibleItemsMap.
				// Brushing should be converted to a filter when data item is in an ordinal slot type.
				// Adding isLatLong conditon for Lat/Ling data. It's a special type in that it's technically treated as categorical slots.
				if (this._canQuery(slotAPI) && (slotAPI.isLatLong() || slotAPI.getType() !== 'ordinal' || includeAllDataItems)) {
					visibleItemsMap[dataItemAPI.getItemId()] = visibleItemsMap[dataItemAPI.getItemId()] || [];
					var visibleItemInfo = { dataItemAPI: dataItemAPI, layerId: slotAPI.getLayerId(), viewId: slotAPI.getViewId() };
					visibleItemsMap[dataItemAPI.getItemId()].push(visibleItemInfo);
				}
			}.bind(this));
			return visibleItemsMap;
		},

		_createQueryProjectionsFromLiveWidgetModel: function _createQueryProjectionsFromLiveWidgetModel(queryContext) {
			var aProjections = [];
			var slotAPIs = this._getQuerySlots();
			_.each(slotAPIs, function (slotAPI) {
				aProjections = aProjections.concat(this._slotToProjections(slotAPI, queryContext));
			}.bind(this));

			if (queryContext && queryContext.queryOptions) {
				// list of projections to be added to the generated projections list
				if (queryContext.queryOptions.extraProjections) {
					aProjections = aProjections.concat(queryContext.queryOptions.extraProjections);
				}
				// list of projection ids to be removed from the generated projections list
				if (typeof queryContext.queryOptions.filterProjections === 'function') {
					aProjections = _.filter(aProjections, queryContext.queryOptions.filterProjections);
				}
			}

			return aProjections;
		},

		_createQueryFilterSpec: function _createQueryFilterSpec(visibleItemsMap) {
			return new QueryFilterSpec(visibleItemsMap);
		},

		//@returns the categorical items for the specified layer
		_getCategoryItemsForLayer: function _getCategoryItemsForLayer(layerId) {
			var slotAPIs = this._getQuerySlots();
			var catSlotsForLayer = _.filter(slotAPIs, function (slotAPI) {
				return slotAPI.getLayerId() === layerId && slotAPI.getFinalSlotType() === 'category';
			});
			//Extract the dataItemId's for each slot in this layer.
			var itemIdsForLayer = [];
			_.each(catSlotsForLayer, function (categorySlot) {
				_.each(categorySlot.getDataItemAPIs(), function (dataItemAPI) {
					itemIdsForLayer.push(dataItemAPI.getItemId());
				});
			});
			return itemIdsForLayer;
		},

		//@returns true if categorySet1 and categorySet2 are different (in both directions)
		_categoriesAreDifferent: function _categoriesAreDifferent(categorySet1, categorySet2) {
			return _.difference(categorySet1 || [], categorySet2 || []).length > 0 || _.difference(categorySet2 || [], categorySet1 || []).length > 0;
		},

		/**
     * Return the local query filters
   * @param queryContext
     * @param mappedLayers
     * @returns query filters
   */
		createLocalFilters: function createLocalFilters(queryContext, mappedLayers) {
			var _this2 = this;

			var queryFilters = [];
			if (_.isEmpty(queryContext)) {
				return queryFilters;
			}

			var excludeNonProjectedRangeFilters = false;
			var categoryItemsForFirstMappedLayer = null;

			_.each(mappedLayers, function (mappedLayer) {
				//NonProjected range filters cannot be applied to any layer whose categories are not the same as the first mapped layer
				//(because the aggregate of different categories is different.)
				var categoryItemsForThisLayer = mappedLayers.length > 1 && _this2._getCategoryItemsForLayer(mappedLayer.id) || [];
				categoryItemsForFirstMappedLayer = categoryItemsForFirstMappedLayer || categoryItemsForThisLayer;

				excludeNonProjectedRangeFilters = _this2._categoriesAreDifferent(categoryItemsForFirstMappedLayer, categoryItemsForThisLayer);

				var filtersConvertedToItemSelections = [];
				_.each(queryContext.filtersConvertedToDataItemSelections, function (excludedFilterEntry) {
					filtersConvertedToItemSelections.push(excludedFilterEntry.getId());
				});

				var queryFilterSpec = _this2._createQueryFilterSpec( /*projected data items*/queryContext.projectedDataItemsMap);
				if (queryContext.entities) {
					queryFilterSpec.addFiltersToSpec(queryContext.entities.localFilters, {
						edgeFilterExceptions: filtersConvertedToItemSelections,
						layerId: mappedLayer.getId(),
						excludeNonProjectedRangeFilters: excludeNonProjectedRangeFilters,
						shouldApplyIsNullValueExpression: _this2._shouldApplyIsNullValueExpression.bind(_this2),
						addExtraQueryDataItem: queryContext && queryContext.queryOptions && queryContext.queryOptions.addExtraQueryDataItem
					});
					queryFilterSpec.addFiltersToSpec(queryContext.entities.searchFilters, {
						edgeFilterExceptions: filtersConvertedToItemSelections
					});

					var layerFilters = queryFilterSpec.hasFilterSpec() ? queryFilterSpec.getFilterSpec() : null;
					if (layerFilters) {
						_.each(layerFilters, function (layerFilter) {
							layerFilter.layerId = mappedLayer.getId();
							queryFilters.push(layerFilter);
						});
					}
				}
			});

			if (queryContext.queryOptions && queryContext.queryOptions.extraFilters) {
				// list of filters to be added to the generated filters list
				queryFilters = queryFilters.concat(queryContext.queryOptions.extraFilters);
			}

			return queryFilters;
		},

		/**
   * @returns true if need to combine isnull in exclude filter (in FilterEntry._buildEdgeNullValueExpresstionQuerySpec)
   * 'filters': [
  	{
  		'type': 'pre',
  		'expression': {
  			'or': [{
  					'itemId': 'someItem',
  					'operator': 'isnull'
  				},
  				{
  					'operator': 'notin',
  					'itemId': 'someItem',
  					'values': [
  						'XXX'
  					]
  				}
  			]
  		}
  	}]
   *
   * The function should return false for an OLAP column
   */
		_shouldApplyIsNullValueExpression: function _shouldApplyIsNullValueExpression(filterEntry) {
			if (!filterEntry.columnId) {
				return false;
			}
			var column = this.visAPI.getMetadataColumn(filterEntry.columnId);
			return column && !column.isOlapColumn();
		},

		_canQuery: function _canQuery(slotAPI) {
			return !(slotAPI.isMultiMeasuresSeries() && !slotAPI.isStacked());
		},

		_getQuerySlots: function _getQuerySlots() {
			return _.filter(this.visAPI.getDataSlots(), function (slotAPI) {
				return this._canQuery(slotAPI);
			}.bind(this));
		},
		_getQueryLayers: function _getQueryLayers() {
			return this.visAPI.getLayers();
		},

		//TODO: Remove the function and sub functions when 'fields' is not needed in the flow for Endor
		_slotToFields: function _slotToFields(slotAPI) {
			//, bDoNotInverseSort) {
			var fields = [];

			_.each(slotAPI.getDataItemAPIs(), function (dataItemAPI, index) {
				if (!slotAPI.isMultiMeasuresSeriesOrValue(index)) {
					fields.push(this._slotItemToField(slotAPI, dataItemAPI));
				}
			}.bind(this));
			return fields;
		},

		/**
   * @private
   * @return {Array} An array of projection IDs of all items assigned to a single slot.
   **/
		_slotToProjections: function _slotToProjections(slotAPI, queryContext) {
			var projections = [];

			// filterProjections will be a function only for summary queries
			var filterProjections = queryContext && queryContext.queryOptions && queryContext.queryOptions.filterProjections;
			var isSummary = typeof filterProjections === 'function';

			var validDataItemIds = _.filter(slotAPI.getDataItemRefs(), function (id, index) {
				return !slotAPI.isMultiMeasuresSeriesOrValue(index);
			});
			// If the slot is stacked and if this is not a summary query, produce a single projection for the slot (using the slot id)
			if (slotAPI.isStacked() && validDataItemIds.length > 1 && !isSummary) {
				projections.push({
					id: slotAPI.getId(),
					layerId: slotAPI.getLayerId()
				});
			} else {
				_.each(validDataItemIds, function (dataItemId) {
					projections.push({
						id: dataItemId,
						layerId: slotAPI.getLayerId()
					});
				});
			}
			return projections;
		},

		/**
   * @private
   * @param slotAPI - the slotAPI of interest
   * @param queryContext - the context of the query.
   * @return {Array} An array of Data Item objects assigned to a single slot.
   **/
		_slotToDataItems: function _slotToDataItems(slotAPI, queryContext) {
			var aDataItems = [];
			var nestList = [];
			_.each(slotAPI.getDataItemAPIs(), function (dataItemAPI, index) {
				if (!slotAPI.isMultiMeasuresSeriesOrValue(index)) {
					aDataItems.push(this.visQueryDataItemBuilder.build(slotAPI, dataItemAPI, queryContext, index));

					//keep track of the list of dataItems assigned to a slot.
					//If a slot has multiple items and the slot is type stacked,
					//use this list as the nestList of a stacke
					nestList.push(dataItemAPI.getUniqueId());
				}
			}.bind(this));

			if (nestList.length > 1 && slotAPI.isStacked()) {
				//If the slot is stacked, produce a dataItem whose name matches the id
				//with nested items whose names match the dataItems.
				aDataItems.push({
					id: slotAPI.getId(),
					nest: nestList,
					layerId: slotAPI.getLayerId()
				});
			}
			return aDataItems;
		},

		/**
   * @returns the field equivalent of this dataslot.
   */
		//TODO: Remove the function and sub functions when 'fields' is not needed in the flow for Endor
		_slotItemToField: function _slotItemToField(slotAPI, dataItemAPI) {
			return {
				id: slotAPI.getId(),
				columnId: dataItemAPI.getItemId(),
				column: {
					isDateOrTimeType: function isDateOrTimeType() {
						return dataItemAPI.isDateOrTimeType();
					},
					getFormat: function getFormat() {
						return null; //Needed for summary view rendering.
					}
				},
				//sort: sortOrder,
				//limit: mapping ? mapping.limit : undefined,
				//sourceCategory: mapping ? mapping.getSourceCategory() : undefined,
				//filterException: this.getFilterException(),
				aggType: dataItemAPI.getAggregationType(),
				getType: function () {
					return this._getSlotType(slotAPI, dataItemAPI);
				}.bind(this),
				label: dataItemAPI.getLabel(),
				dataType: dataItemAPI.getDataType(),
				layerId: slotAPI.getLayerId()

				//useInTopBottomQueries: this.shouldBeUsedInTopBottomQueries(),
				//categorySubType: slot.getCategorySubType(),
				//ignoreSlotForViz: this.definition.ignoreSlotForViz,
				//postSortResultsDescending: this.postSortResultsDescending()
			};
		},

		/**
   * Returns the type of this slot as one of category, ordinal or 'any'.
   * Type 'any' will only be returned for unmapped slots
   * @returns the slot type.  For slots of type 'any', the mapping will be used to determine the type.
   */
		_getSlotType: function _getSlotType(slotAPI, dataItemAPI) {
			if (slotAPI.getType() === 'any') {
				return dataItemAPI.getType() === 'attribute' ? 'category' : dataItemAPI.getType() === 'fact' ? 'ordinal' : 'category';
			}
			return slotAPI.getType();
		}
	});

	return VisQueryBuilder;
});
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