'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2017, 2019
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 *
 * VisQueryDataItemBuilder
 * The VisQueryDataItemBuilder is responsible for turning the information in a dataItem into a dss query.
 */
define(['underscore', '../../../lib/@waca/core-client/js/core-client/ui/core/Class', './postprocess/LocalAggregateSortInfo'], function (_, Class, LocalAggregateSortInfo) {
	'use strict';
	// noinspection JSAnnotator
	/**
  * INTENT: VisQueryDataItemBuilder is used to construct a dataItem in the form needed by the query.
  * building the dataItem involves a number of 'on the fly' steps such as:
  *		inserting the appropriate initial selection based on the current drill state,
  * 		deciding if a filter should be a dataItem selection
  *		ensuring that selections are performed in a predictable order (initial selection (root members or drill members), keep/remove, topN, sort)
  */

	var MAX_DECIMAL_PLACES = 2;
	var VisQueryDataItemBuilder = Class.extend({

		init: function init(attributes) {
			VisQueryDataItemBuilder.inherited('init', this, arguments);
			this.visAPI = attributes.visAPI;
			this._querySlotSortPriority = 0;
			this._localAggregateSortInfo = attributes.localAggregateSortInfo || new LocalAggregateSortInfo(attributes.visAPI);
		},

		setQuerySlotSortPriority: function setQuerySlotSortPriority(priority) {
			this._querySlotSortPriority = priority;
		},

		/**
   * @return serverSort boolean true to use server sort.
   */
		getServerSort: function getServerSort() {
			return this._serverSort;
		},

		/**
   * @param serverSort true to use server sort.
   */
		setServerSort: function setServerSort(serverSort) {
			this._serverSort = serverSort;
		},

		/*
   * @private
   * @return {Array} An array of Data Item objects assigned to a single slot.
   **/
		build: function build(slotAPI, dataItemAPI, queryContext, dataItemIdx) {
			var oDataItemJSON = dataItemAPI.toQueryJSON();
			oDataItemJSON.layerId = slotAPI.getLayerId();

			if (slotAPI.getFinalSlotType(dataItemIdx) === 'ordinal') {
				// If the final slot type is ordinal, it means we are querying the data item
				// in a ordinal form, which in this case we want to respect the aggregation type
				// except 'none'
				oDataItemJSON.aggregate = slotAPI.getFinalAggregationType(dataItemIdx);
			} else {
				delete oDataItemJSON.aggregate;
			}
			var finalSelection = this._buildFinalItemSelections(slotAPI, dataItemAPI, queryContext, oDataItemJSON);
			if (finalSelection.length) {
				oDataItemJSON.selection = finalSelection;
			} else if (oDataItemJSON.selection && oDataItemJSON.selection.length === 0) {
				// avoid having an empty selection in query spec
				delete oDataItemJSON.selection;
			}
			var binning = this._buildBinningSpec(dataItemAPI);
			//binned dataItem type will be attribute, so if it has aggregate we need to remove it.
			// binningDefinition is part of toQueryJSON (need for copy/past), but dss query has different format
			if (binning) {
				//remove old selection, since it may have top/bottom
				if (!finalSelection.length) {
					delete oDataItemJSON.selection;
				}
				delete oDataItemJSON.binningDefinition;
				delete oDataItemJSON.aggregate;
				oDataItemJSON.binning = binning;
			}
			return oDataItemJSON;
		},

		_buildBinningSpec: function _buildBinningSpec(dataItemAPI) {
			var binningAPI = dataItemAPI.getBinningAPI();
			if (binningAPI) {
				var format = dataItemAPI.getFormat();
				var maxDecPlaces = format && (format.formatSpec.maximumFractionDigits || format.formatSpec.maximumFractionDigits === 0) ? format.formatSpec.maximumFractionDigits : MAX_DECIMAL_PLACES;
				binningAPI.setMaxDecPlaces(maxDecPlaces);
				return binningAPI.getBinning();
			}
			return null;
		},


		//unless selections are pre-defined and locked (WA2 upgrade), add selection actions in a specific order
		//to ensure that the results are predictable and explainable!
		_buildFinalItemSelections: function _buildFinalItemSelections(slotAPI, dataItemAPI, queryContext, oDataItemJSON) {
			//TODO: For WA2, the dataItemSelections will be locked.  In that case we need to honour the selections from the dataItem 'as is'.
			if (!dataItemAPI.isBinned()) {
				//By default, return selections in the order agreed to by PM.
				return this._buildDrillStateForHierarchyOrSet(dataItemAPI, queryContext, oDataItemJSON).concat(this._buildItemSelectionsFromFilterCollections(dataItemAPI, queryContext), this._buildTopBottom(dataItemAPI), this._buildSort(slotAPI, dataItemAPI));
			} else {
				return this._buildItemSelectionsFromFilterCollections(dataItemAPI, queryContext).concat(this._buildSort(slotAPI, dataItemAPI));
			}
		},

		//For hierarchies or OLAP set, build one of root members, children of single root or children of current drill member.
		_buildDrillStateForHierarchyOrSet: function _buildDrillStateForHierarchyOrSet(dataItemAPI, queryContext, oDataItemJSON) {
			var localFilters = queryContext && queryContext.entities && queryContext.entities.localFilters;
			var matchingLocalFilterEntry = localFilters && localFilters.getFilterEntry({ id: dataItemAPI.getItemId(), columnId: dataItemAPI.getItemId() });

			var overrideHierarchyDefaultSelection = matchingLocalFilterEntry && matchingLocalFilterEntry.overrideHierarchyDefaultSelection;
			var selection = [];

			if (dataItemAPI.isHierarchy() || dataItemAPI.isNamedSet()) {
				var existingDrillSelection = dataItemAPI.getDrillSelection();
				if (existingDrillSelection) {
					if (dataItemAPI.isNamedSet()) {
						oDataItemJSON.itemId = dataItemAPI.getRefToHierarchy();
					}
					selection.push(existingDrillSelection);
				} else if (dataItemAPI.isHierarchy() && !overrideHierarchyDefaultSelection) {
					if (dataItemAPI.isSingleRootHierarchy()) {
						selection.push({
							'operation': 'add',
							'children': dataItemAPI.getRootMember()
						});
					} else {
						selection.push({
							'operation': 'add',
							'rootMembers': true
						});
					}
				}
			}
			return selection;
		},

		_convertFilterOperatorToSetOperation: function _convertFilterOperatorToSetOperation(operator) {
			switch (operator) {
				case 'in':
				case 'containsignorecase':
					return 'keep';
				case 'notin':
					return 'remove';
				default:
					return;
			}
		},

		_convertFilterEntryToSelection: function _convertFilterEntryToSelection(filterEntry) {
			var discreteOperation = this._convertFilterOperatorToSetOperation(filterEntry.operator);
			var result = null;
			if (discreteOperation) {
				var valuesArray = _.map(filterEntry.values.models, function (valueEntry) {
					return valueEntry.value.u ? valueEntry.value.u : valueEntry.value;
				});
				result = {
					operation: discreteOperation
				};

				if (filterEntry.operator === 'containsignorecase') {
					result.filter = {
						operator: filterEntry.operator,
						values: valuesArray
					};
				} else {
					result.set = valuesArray;
				}
			}
			return result;
		},


		_convertItemFiltersToSelections: function _convertItemFiltersToSelections(filters, queryContext, selections) {
			var _this = this;

			queryContext.filtersConvertedToDataItemSelections = queryContext.filtersConvertedToDataItemSelections || [];
			_.each(filters, function (filterEntry) {
				if (filterEntry && filterEntry.values.models.length > 0 && !filterEntry.conditions) {
					var selectionItem = _this._convertFilterEntryToSelection(filterEntry);
					if (selectionItem) {
						selections.push(selectionItem);
					}
					//Track which filters were converted to dataItemSelections (so we don't filter on them as well!)
					queryContext.filtersConvertedToDataItemSelections.push(filterEntry);
				}
			});
		},

		/**
   * Convert Filters into Selections.
   *
   * In cases where the dataItem has facetData enabled (most of the time)
   * AND there is a filter on that dataItem, convert the filter to a set selection on the dataItem.
   * Note: this ensures that a contextual topN on an item will return N members from the remaining set
   *		EXAMPLE:  top2 Products based on Revenue
   *					Product1	$1000
   *					Product2	$2000
   *					Product3	$1500
   *					Product4	$1700
   *		Keep Product1, Product3, Product4
   *		setSelect Result = $1700, $1500 (the top2 of the selected set ==> which is what most people would expect)
   *		Filter Result = $1700 (because only Product4 is in the Top2 of the entire set)
   *
   **/
		_buildItemSelectionsFromFilterCollections: function _buildItemSelectionsFromFilterCollections(dataItemAPI, queryContext) {
			var dataItemId = dataItemAPI.getItemId();
			var localFiltersAPI = queryContext && queryContext.entities && queryContext.entities.localFilters;
			var searchFiltersAPI = queryContext && queryContext.entities && queryContext.entities.searchFilters;

			var existingSetSelection = dataItemAPI.setSelectionsToQueryJSON();
			var selections = existingSetSelection ? existingSetSelection : [];

			var isAuxQuery = queryContext && queryContext.auxQuery;
			if (!isAuxQuery && dataItemAPI.isDimensional()) {
				if (localFiltersAPI) {
					this._convertItemFiltersToSelections(localFiltersAPI.getFilterEntries({ id: dataItemId }), queryContext, selections);
				}
				if (searchFiltersAPI) {
					this._convertItemFiltersToSelections(searchFiltersAPI.getFilterEntries({ id: dataItemId }), queryContext, selections);
				}
			}
			return selections;
		},

		_buildTopBottom: function _buildTopBottom(dataItemAPI) {
			var selection = [];
			var topBottom = dataItemAPI.getTopBottomSelection();
			if (topBottom) {
				selection.push(topBottom);
			}
			return selection;
		},

		_buildSort: function _buildSort(slotAPI, dataItemAPI) {
			var bClientSortEnabled = this.getServerSort() ? false : this._isClientSideSortEnabledForDataItem(dataItemAPI);

			var selection = [];
			if (!bClientSortEnabled) {
				// 1. Sort from data item.
				var sort = dataItemAPI.getSort();
				var sortObj = sort && sort.type ? sort : null;
				var ignoreSlotSort = this.visAPI.isIgnoreDefaultSlotSort(dataItemAPI);
				// Preserve the hierarchical order for Olap column.
				if (!sortObj && !ignoreSlotSort) {
					sortObj = dataItemAPI.getDefaultSort(slotAPI, dataItemAPI);
					if (sortObj) {
						sortObj.priority = this._querySlotSortPriority++;
					}
				}

				if (sortObj) {
					var sortSelection = {
						'operation': 'order',
						'sort': _.pick(sortObj, 'type', 'by', 'priority')
					};

					if (sortObj.context) {
						sortSelection.context = [{
							itemId: sortObj.context
						}];
					}
					selection = [sortSelection];
				}
			}
			return selection;
		},

		/**
   * If there will be any post processing client side sorting on the dataItem
   * optimize to not sort on server as well.
   */
		_isClientSideSortEnabledForDataItem: function _isClientSideSortEnabledForDataItem(dataItemAPI) {
			var localSortInfo = this._localAggregateSortInfo.getSortInfo();
			if (localSortInfo) {
				return localSortInfo.aggregateColumn === dataItemAPI.getUniqueId();
			}
			return false;
		}
	});

	return VisQueryDataItemBuilder;
});
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