'use strict';

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * Licensed Materials - Property of IBM
 * IBM Business Analytics (C) Copyright IBM Corp. 2020
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

/**
 * @class VisDnDSlotToSlotProvider
 * @hideconstructor
 *
 * @classdesc Handles drag and drop of metadata from slot to slot.
 */
define(['underscore', 'dashboard-analytics/apiHelpers/SlotAPIHelper'], function (_, SlotAPIHelper) {
	return function () {
		function VisDnDSlotToSlotProvider() {
			var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

			_classCallCheck(this, VisDnDSlotToSlotProvider);

			this.visDnDUtils = options.visDnDUtils;
			this.dashboardAPI = options.dashboardAPI;
			this.content = options.content;
			this.visualization = options.visualization;
		}

		VisDnDSlotToSlotProvider.prototype.destroy = function destroy() {
			this.visDnDUtils = null;
			this.dashboardAPI = null;
			this.content = null;
		};

		/**
   * @param {Object} source - the DndSource defined by whichever source starts the drag
   * @param {Object} target - the DnDTarget defined by the drop target which includes target specific information.
   * @param {String} target.el - the drop node.
   * @param {String} target.type - the type of the target (eg. slot.item)
   * @param {String} target.info - a target-specific function which includes information about that target.
   * @return {boolean} true if this provider supports the dndSource and target. 
   */


		VisDnDSlotToSlotProvider.prototype.supports = function supports(source, target) {
			//Normally slots can accept the content of other slots.  VisOverLay slots explicitly wire this off.
			return source.type === 'SLOT_ITEM' && source.data.source && !target.info.isVisOverlay;
		};

		VisDnDSlotToSlotProvider.prototype.accepts = function accepts(source, target) {
			if (!this.supports(source, target)) {
				return false;
			}
			return this._acceptsSlotItem(source, target);
		};

		VisDnDSlotToSlotProvider.prototype.onDrop = function onDrop(source, target) {
			//TODO: use a more generic onDrop callback rather than the full slotDataItemHandler.
			//		and use slotAPI's/mappedDataItemAPI's instead.
			//		same for SlotToSlotProvider
			if (!this.supports(source, target)) {
				return false;
			}
			target.info.onDrop(source, target);
		};

		//Can this slotDataItem accept a dataItem from this slot or another slot?


		VisDnDSlotToSlotProvider.prototype._acceptsSlotItem = function _acceptsSlotItem(source, target) {
			var sourceSlot = source.data.source.slot;
			var sourceIndexInSlot = source.data.source.indexInSlot;

			var targetSlotId = target.info.slot.getId();

			//You CAN'T add nothing
			if (!sourceSlot) {
				return false;
			}

			//You CAN'T add an item on itself or after the item before it within the same slot
			//(it is legitimate to swap an item with the item before it though)
			if (targetSlotId === sourceSlot.getId() && (sourceIndexInSlot === target.info.indexInSlot || (target.info.addAfter && sourceIndexInSlot - target.info.indexInSlot) === 1)) {
				return false;
			}

			//You CAN'T drop metadatacolumns that have certain taxonomy characteristics
			var sourceDataItem = sourceSlot.getDataItemList()[sourceIndexInSlot];
			var sourceMetadataColumn = sourceDataItem.getMetadataColumn();
			if (!this.isMeasureGroupItem(sourceSlot, sourceIndexInSlot) && !this._itemsSupported([sourceMetadataColumn], target.info.slot)) {
				return false;
			}

			//You CAN'T drop on top of the placeholder dataItem 'Measure Group (n)' from another item (you can drop after it)
			//EXCEPTION: You CAN drop on top if the source item is in the same slot.
			if (!target.info.addAfter && this.isMeasureGroupItem(target.info.slot, target.info.indexInSlot) && targetSlotId !== sourceSlot.getId()) {
				return false;
			}

			//You CAN'T drop 'Measure Group (n)' on any ordinal slot
			//TODO: follow rule from old slot editor which only checked ordinal slots (not any slots with finalSlotType=ordinal). Should it?
			if (target.info.slot.getDefinition().getType() === 'ordinal' && this.isMeasureGroupItem(sourceSlot, sourceIndexInSlot)) {
				return false;
			}

			// Can't swap a measure group if the dataset doesn't match
			var sourceDatasetIdList = sourceSlot.getDefinition().getDatasetIdList();
			var targetDatasetIdList = target.info.slot.getDefinition().getDatasetIdList();
			if (this.isMeasureGroupItem(sourceSlot, sourceIndexInSlot) && !_.isEqual(sourceDatasetIdList, targetDatasetIdList)) {
				return false;
			}

			return this._acceptsCommon(source, target, /*countOfItems*/1, target.info.addAfter);
		};

		VisDnDSlotToSlotProvider.prototype.isMeasureGroupItem = function isMeasureGroupItem(slot, indexInSlot) {
			if (SlotAPIHelper.isMultiMeasuresSeriesSlot(slot)) {
				var thisDataItem = slot.getDataItemList()[indexInSlot];
				return thisDataItem && thisDataItem.getColumnId() === '_multiMeasuresSeries';
			}
			return false;
		};

		VisDnDSlotToSlotProvider.prototype._itemsSupported = function _itemsSupported(metadataColumns, slot) {
			//convert to new metadataColumn api
			var sourceId = metadataColumns[0].getSourceId();
			var dataSource = sourceId && this.dashboardAPI.getFeature('DataSources').getDataSource(sourceId);
			if (dataSource) {
				var newMetadataColumnAPIs = metadataColumns.map(function (metadataColumn) {
					return dataSource.getMetadataColumn(metadataColumn.getId());
				});
				return slot.supportsColumns(newMetadataColumnAPIs);
			}
			return false;
		};

		VisDnDSlotToSlotProvider.prototype._acceptsCommon = function _acceptsCommon(source, target, countOfItemsToDrop, addAfter) {
			var sourceSlot = source.data.source.slot;
			var sourceIndexInSlot = source.data.source.indexInSlot;

			var targetSlotId = target.info.slot.getId();

			//IF this definition contains (or could contain) a multiMeasuresSeries item,
			//You CAN drop on or after in a values slot (even though values has maxItems of 1 => multi-items go where 'Measure Group (n)' is)
			if (target.info.slot.getId() === 'values' && SlotAPIHelper.isMultiMeasuresSeriesSlot(target.info.slot) || target.info.slot.getDefinition().isMultiMeasureSupported()) {
				return true;
			}

			//{ targetSlotId, sourceSlotId, indexInSourceSlot, sourceColumns, indexInTargetSlot, isReplace }
			var params = {
				targetSlotId: targetSlotId,
				sourceSlotId: sourceSlot.getId(),
				indexInSourceSlot: sourceIndexInSlot,
				sourceColumns: undefined,
				indexInTargetSlot: target.info.addAfter ? target.info.indexInSlot + 1 : target.info.indexInSlot,
				isReplace: !target.info.addAfter
			};
			var expandCollapseFeatureFlag = !this.dashboardAPI.getGlassCoreSvc('.FeatureChecker').checkValue('dashboard', 'expandCollapse', 'disabled');
			if (expandCollapseFeatureFlag && this.visualization.getType() === 'Crosstab') {
				if (!this.visDnDUtils.acceptsOlapV2(params)) {
					return false;
				}
			}

			//You CAN'T drop more items than the slot can allow.
			//(BUT you'll never exceed the slot limit if you're just re-arranging items in a single slot)
			return sourceSlot.getId() === targetSlotId || !this.visDnDUtils.exceedsItemsLimit(countOfItemsToDrop, target.info.indexInSlot, addAfter, target.info.slot);
		};

		return VisDnDSlotToSlotProvider;
	}();
});
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