'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: BI Dashboard
 *| (C) Copyright IBM Corp. 2017, 2019
 *|
 *| US Government Users Restricted Rights - Use, duplication or disclosure
 *| restricted by GSA ADP Schedule Contract with IBM Corp.
 *+------------------------------------------------------------------------+
 */

/**
 * This Class encapsulates raw query result data returned from DSS and provides its accessors and iterators
 **/
define(['../../../lib/@waca/core-client/js/core-client/ui/core/Class', 'underscore', './QueryResultDataUtils', './QueryResultDataItem'], function (BaseClass, _, Utils, DataItem) {
	'use strict';

	var RowIterator = BaseClass.extend({
		_rows: null,
		_index: -1,
		_oQueryResultData: null,

		init: function init(rows) {
			this._index = -1;
			this._rows = rows;
		},

		setQueryResultDataRef: function setQueryResultDataRef(queryResultData) {
			this._oQueryResultData = queryResultData;
		},

		hasNext: function hasNext() {
			return this._rows && this._rows.length > 0 && this._index < this._rows.length - 1;
		},

		next: function next() {
			this._index++;
		},

		/**
   * @return the ordinal index of categorical value or the continuous value itself
   **/
		getValue: function getValue(datapointIndex) {
			var oDatapoint = this._getDatapoint(datapointIndex);
			if (_.isObject(oDatapoint) && oDatapoint.v !== undefined) {
				return oDatapoint.v;
			}
			return oDatapoint;
		},

		/**
   * @return the resolved value
   **/
		getResolvedValue: function getResolvedValue(datapointIndex) {
			var oDatapoint = this._getDatapoint(datapointIndex);
			if (_.isObject(oDatapoint) && oDatapoint.v !== undefined) {
				Utils.normalizeData(oDatapoint);
				return oDatapoint;
			}
			if (this._oQueryResultData) {
				return this._oQueryResultData.getResultDataItem(datapointIndex).getTuple(oDatapoint);
			}

			return null;
		},

		_getDatapoint: function _getDatapoint(datapointIndex) {
			if (this._index >= 0) {
				var oDatapoint = this._rows[this._index];
				if (oDatapoint && oDatapoint.pt && oDatapoint.pt.length > 0) {
					return oDatapoint.pt[datapointIndex];
				}
			}
			return null;
		}
	});

	var QueryResultData = BaseClass.extend({
		/**
   * Internal value that refers to the original query result data object
   * @private
   * @member {Object}
   **/
		_resultData: null,
		_aQueryResultDataItems: null, //Array of QueryResultDataItem Class. Init to null to indicate initial state

		init: function init(data) {
			QueryResultData.inherited('init', this, arguments);
			this._resultData = data;
		},

		/**
   * @param {Integer} rowIndex row index
   * @param {Integer} colIndex column index
   * @return The referenced tuple/value that composes the data point located by the indexes
   **/
		getCellValue: function getCellValue(rowIndex, colIndex) {
			var result;
			var value = this._getCellRefByIndexes(rowIndex, colIndex);
			if (Utils.isRectifyNeeded(value)) {
				result = Utils.getRectifiedData(value);
			} else if (value.v !== undefined || value.value !== undefined) {
				result = value;
				Utils.normalizeData(result);
			} else {
				result = this.getResultDataItem(colIndex).getTuple(value) || []; /*Categorical data item object*/
			}
			return result;
		},

		/**
   * @param {Integer} rowIndex row index
   * @param {Integer} colIndex column index
   * @return The index/value that composes the data point located by the indexes
   **/
		_getCellRefByIndexes: function _getCellRefByIndexes(rowIndex, colIndex) {
			var oPoint = this._getDatapointEntry(rowIndex);
			if (oPoint && oPoint.pt) {
				var aPoint = oPoint.pt;
				if (aPoint && aPoint.length > 0 && colIndex !== undefined && colIndex < aPoint.length) {
					return aPoint[colIndex];
				}
			}
			return null;
		},

		_getDatapointEntry: function _getDatapointEntry(rowIndex) {
			if (rowIndex >= 0 && this._resultData && this._resultData.data) {
				return this._resultData.data[rowIndex];
			}
			return null;
		},

		getDatapoints: function getDatapoints() {
			return this._resultData.data;
		},

		/**
   * @return {Integer} the count of datapoints in the query result data response
   **/
		getDatapointCount: function getDatapointCount() {
			if (this._resultData && this._resultData.data) {
				return this._resultData.data.length;
			}
			return 0;
		},

		/**
   * Reset the data items object array
   * This is called after post-processing when the data is restructured
   */
		resetDataItemArray: function resetDataItemArray() {
			this._generateDataItemArray();
		},

		_isValidDataItem: function _isValidDataItem(dataItem) {
			var _fIsValidItemClass = function _fIsValidItemClass(itemClassEntry) {
				return itemClassEntry.h[0].d !== null && itemClassEntry.h[0].u !== null;
			};
			//A data item could have multiple item class sections, while each item Class section could have multiple item class enties
			if (_.isArray(dataItem.itemClass)) {
				var bResult = true;
				_.each(dataItem.itemClass, function (itemClassEntry) {
					if (!_fIsValidItemClass(itemClassEntry)) {
						bResult = false;
						return;
					}
				});
				return bResult;
			} else if (_.isObject(dataItem.itemClass)) {
				return _fIsValidItemClass(dataItem.itemClass);
			}
			return false;
		},

		_generateDataItemArray: function _generateDataItemArray() {
			this._aQueryResultDataItems = [];
			if (this._resultData && this._resultData.dataItems && this._resultData.dataItems.length > 0) {
				_.each(this._resultData.dataItems, function (dataItem) {
					if (this._isValidDataItem(dataItem)) {
						this._aQueryResultDataItems.push(new DataItem(dataItem));
					}
				}.bind(this));
			}
		},

		/**
   * @return {Number} the Query result data format version
   **/
		getVersion: function getVersion() {
			if (this._resultData) {
				return this._resultData.version;
			}
			return null;
		},

		/**
   * @return {Integer} the count of the data items
   **/
		getResultDataItemCount: function getResultDataItemCount() {
			if (this._resultData) {
				return (_.filter(this._resultData.dataItems, function (dataItem) {
					return this._isValidDataItem(dataItem);
				}.bind(this)) || []).length;
			}
			return 0;
		},

		/**
   * @return {QueryResultDataItem} One QueryResultDataItem Object located at the index
   */
		getResultDataItem: function getResultDataItem(index) {
			if (!this._aQueryResultDataItems) {
				this._generateDataItemArray();
			}
			return this._aQueryResultDataItems[index];
		},

		/**
   * @return {Array} An array of all QueryResultDataItem objects
   **/
		getResultDataItems: function getResultDataItems() {
			if (this._resultData) {
				if (!this._aQueryResultDataItems) {
					this._generateDataItemArray();
				}
				return this._aQueryResultDataItems;
			}
			return [];
		},

		/**
   * @return {Array} An array of all QueryResultDataItem objects
   **/
		getResultDataItemsNoValidation: function getResultDataItemsNoValidation() {
			var aQRDataItems = [];
			this._resultData.dataItems.forEach(function (dataItem) {
				aQRDataItems.push(new DataItem(dataItem));
			});
			return aQRDataItems;
		},

		/**
   * @param {String} dataItemRefID Data item reference ID, Unique ID A.K.A Projection ID
   * @return {Integer} the index number of the DataItem
   **/
		getDataItemIndex: function getDataItemIndex(dataItemRefID) {
			var nIndex = -1;
			if (this._resultData) {
				_.find(this.getResultDataItems(), function (dataItem, index) {
					if (dataItem.getTupleHeaderId() === dataItemRefID) {
						nIndex = index;
						return true;
					}
				});
			}
			return nIndex;
		},

		/**
   * @param {String} dataItemRefID Data item reference ID, Unique ID A.K.A Projection ID
   * @return {QueryResultDataItem} QueryResultDataItem Object with data item reference ID
   */
		getDataItem: function getDataItem(dataItemRefID) {
			return this.getResultDataItem(this.getDataItemIndex(dataItemRefID));
		},

		/**
   * Create and return a data row iterator instance
   * @return {DataRowIterator}
   **/
		getDataRowIterator: function getDataRowIterator() {
			var oIterator = new RowIterator(this._resultData.data);
			oIterator.setQueryResultDataRef(this);
			return oIterator;
		},

		/**
   * @return {Array} two dimensions array that stores the resolved values from query result data datapoints
   **/
		getResolvedDataRows: function getResolvedDataRows() {
			var nDatapointCount = this.getDatapointCount();
			var nDataItemCount = this.getResultDataItemCount();
			var aResult = [];
			for (var i = 0; i < nDatapointCount; i++) {
				aResult[i] = [];
				for (var j = 0; j < nDataItemCount; j++) {
					aResult[i].push(this.getCellValue(i, j));
				}
			}
			return aResult;
		},

		/**
   * @return {boolean} true if resultData includes hasNext or hasPrev true
   **/
		hasMoreData: function hasMoreData() {
			if (this._resultData) {
				return !!(this._resultData.hasPrev || this._resultData.hasNext);
			}
			return false;
		}
	});

	return QueryResultData;
});
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