'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2015, 2019
 * 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', './NormalizedPosition', './NormalizedSelection', 'jquery', 'underscore'], function (Class, NormalizedPosition, NormalizedSelection, $, _) {

	/**
  * Represents a selection from the document model, but with normalized positions within its ranges
  */
	var ContentEditableSelectionManager = Class.extend({

		/**
   * @param {node} contentEditableNode - the node with contenteditable=true
   * @param {string} editableNodesSelector - a jQuery selector which will identify valid nodes under 'contentEditableNode' that the user can insert
   * 		text to, and which the first one should never be deleted
   */
		init: function init(contentEditableNode, editableNodesSelector) {
			this.node = $(contentEditableNode);
			this.editableNodesSelector = editableNodesSelector;
		},

		/*
   * Finds all nodes under this.node which can receive text
   */
		_getEditableNodes: function _getEditableNodes() {
			return this.node.find(this.editableNodesSelector);
		},

		/*
   * @param {node} node
   * @return true iff 'node' can receive text from the user
   */
		_isInEditableNode: function _isInEditableNode(node) {
			return !!this._getEditableNodes().filter(function (i, n) {
				return n === node || $.contains(n, node);
			}).length;
		},

		filterKeypress: function filterKeypress(event) {
			var mayNeedToBlock = false,
			    shouldBeCursor = false,
			    block = false;

			if (event.which === 8 /*backspace*/) {
					mayNeedToBlock = true;
					shouldBeCursor = true;
				} else if (event.ctrlKey || event.metaKey) {
				/* ctrl-s, ctrl-z, ctrl-y*/
				block = event.which === 83 || event.which === 90 || event.which === 89;
			}

			if (mayNeedToBlock) {
				var selection = new NormalizedSelection(document.getSelection());
				var startPosition;
				if ($(this.node[0]).find('.note-editable')) {
					startPosition = new NormalizedPosition($(this.node[0]).find('.note-editable').get(0), 0);
				} else {
					startPosition = new NormalizedPosition(this.node[0], 0);
				}
				block = _.find(selection.ranges, function (range) {
					return range.isCursor() === shouldBeCursor && range.start.equals(startPosition);
				});
			}

			if (block) {
				event.preventDefault();
			}
		}
	});

	return ContentEditableSelectionManager;
});
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