'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2015, 2017
 * 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'], function (Class, NormalizedPosition) {

	/*
  * Represents a range from the document model, but with normalized positions
  */
	var NormalizedRange = Class.extend({

		/*
   * @param {range} a Range object from the browser
   */
		init: function init(range) {
			this.original = range;
			this.start = new NormalizedPosition(range.startContainer, range.startOffset);
			this.end = new NormalizedPosition(range.endContainer, range.endOffset);
		},

		/**
   * @return true iff this range isn't a selection, but rather a cursor location
   */
		isCursor: function isCursor() {
			return this.start.equals(this.end);
		},

		/**
   * @param {string} [selector] a selector to specify whether to restrict which DOM elements the new selection should be defined in terms of
   * @return a Range object for use in selection, tweaked for best accuracy in a browser
   */
		toDocumentRange: function toDocumentRange(selector) {
			var range = document.createRange();
			var start = this.start.chooseDocumentPosition(false, selector);
			if (!start) {
				return null;
			}

			range.setStart(start.container, start.offset);

			var end = null;
			if (this.isCursor()) {
				end = start; //use identical parameters to start
			} else {
				//set favourEarlier to true to collapse the selection to only the nodes with actual content
				end = this.end.chooseDocumentPosition(true, selector);
			}
			range.setEnd(end.container, end.offset);
			return range;
		}
	});

	return NormalizedRange;
});
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