/*!
* This file is part of Aloha Editor Project http://aloha-editor.org
* Copyright © 2010-2011 Gentics Software GmbH, aloha@gentics.com
* Contributors http://aloha-editor.org/contribution.php
* Licensed unter the terms of http://www.aloha-editor.org/license.html
*//*
* Aloha Editor is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.*
*
* Aloha Editor is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Ensure GENTICS Namespace
GENTICS = window.GENTICS || {};
GENTICS.Utils = GENTICS.Utils || {};

define(
['aloha/jquery', 'util/dom', 'util/class', 'aloha/console', 'aloha/rangy-core'],
function(jQuery, Dom, Class, console) {
	

	var
		GENTICS = window.GENTICS,
		rangy = window.rangy;

/**
 * @namespace GENTICS.Utils
 * @class RangeObject
 * Represents a selection range in the browser that
 * has some advanced features like selecting the range.
 * @param {object} param if boolean true is passed, the range will be deducted from the current browser selection.
 * If another rangeObject is passed, it will be cloned.
 * If nothing is passed, the rangeObject will be empty.
 * @constructor
 */
GENTICS.Utils.RangeObject = Class.extend({
	_constructor: function(param){
		// Take the values from the passed object
		if (typeof param === 'object') {
			if (typeof param.startContainer !== 'undefined') {
				this.startContainer = param.startContainer;
			}
			if (typeof param.startOffset !== 'undefined') {
				this.startOffset = param.startOffset;
			}
			if (typeof param.endContainer !== 'undefined') {
				this.endContainer = param.endContainer;
			}
			if (typeof param.endOffset !== 'undefined') {
				this.endOffset = param.endOffset;
			}
		} else if (param === true) {
			this.initializeFromUserSelection();
		}
	},

	/**
	 * DOM object of the start container of the selection.
	 * This is always has to be a DOM text node.
	 * @property startContainer
	 * @type {DOMObject}
	 */
	startContainer: undefined,

	/**
	 * Offset of the selection in the start container
	 * @property startOffset
	 * @type {Integer}
	 */
	startOffset: undefined,

	/**
	 * DOM object of the end container of the selection.
	 * This is always has to be a DOM text node.
	 * @property endContainer
	 * @type {DOMObject}
	 */
	endContainer: undefined,

	/**
	 * Offset of the selection in the end container
	 * @property endOffset
	 * @type {Integer}
	 */
	endOffset: undefined,

	/**
	 * Delete all contents selected by the current range
	 * @param rangeTree a GENTICS.Utils.RangeTree object may be provided to start from. This parameter is optional
	 */
	deleteContents: function () {

		Dom.removeRange(this);

	},

	/**
	 * Output some log
	 * TODO: move this to Aloha.Log
	 * @param message log message to output
	 * @return void
	 * @deprecated
	 * @hide
	 */
	log: function(message) {
		console.deprecated( 'Utils.RangeObject', 'log() is deprecated. use ' +
				'console.log() from module "aloha/console" instead: ' + message);
	},

	/**
	 * Method to test if a range object is collapsed.
	 * A range is considered collapsed if either no endContainer exists or the endContainer/Offset equal startContainer/Offset
	 * @return {boolean} true if collapsed, false otherwise
	 * @method
	 */
	isCollapsed: function() {
		return (
			!this.endContainer || 
			(this.startContainer === this.endContainer && this.startOffset === this.endOffset)
		);
	},

	/**
	 * Method to (re-)calculate the common ancestor container and to get it.
	 * The common ancestor container is the DOM Object which encloses the
	 * whole range and is nearest to the start and end container objects.
	 * @return {DOMObject} get the common ancestor container
	 * @method
	 */
	getCommonAncestorContainer: function() {
		if (this.commonAncestorContainer) {
			// sometimes it's cached (or was set)
			return this.commonAncestorContainer;
		}

		// if it's not cached, calculate and then cache it
		this.updateCommonAncestorContainer();

		// now return it anyway
		return this.commonAncestorContainer;
	},

	/**
	 * Get the parent elements of the startContainer/endContainer up to the given limit. When the startContainer/endContainer
	 * is no text element, but a node, the node itself is returned as first element.
	 * @param {jQuery} limit limit object (default: body)
	 * @param {boolean} fromStart true to fetch the parents from the startContainer, false for the endContainer
	 * @return {jQuery} parent elements of the startContainer/endContainer as jQuery objects
	 * @method
	 */
	getContainerParents: function (limit, fromEnd) {
		// TODO cache the calculated parents
		var
			container = fromEnd ? this.endContainer : this.startContainer,
			parents, limitIndex,
			i;

		if (!container) {
			return false;
		}

		if ( typeof limit === 'undefined' || ! limit ) {
			limit = jQuery('body');
		}

		
		if (container.nodeType == 3) {
			parents = jQuery(container).parents();
		} else {
			parents = jQuery(container).parents();
			for (i = parents.length; i > 0; --i) {
				parents[i] = parents[i - 1];
			}
			parents[0] = container;
		}

		// now slice this array
		limitIndex = parents.index(limit);

		if (limitIndex >= 0) {
			parents = parents.slice(0, limitIndex);
		}

		return parents;
	},

	/**
	 * Get the parent elements of the startContainer up to the given limit. When the startContainer
	 * is no text element, but a node, the node itself is returned as first element.
	 * @param {jQuery} limit limit object (default: body)
	 * @return {jQuery} parent elements of the startContainer as jQuery objects
	 * @method
	 */
	getStartContainerParents: function(limit) {
		return this.getContainerParents(limit, false);
	},

	/**
	 * Get the parent elements of the endContainer up to the given limit. When the endContainer is
	 * no text element, but a node, the node itself is returned as first element.
	 * @param {jQuery} limit limit object (default: body)
	 * @return {jQuery} parent elements of the endContainer as jQuery objects
	 * @method
	 */
	getEndContainerParents: function(limit) {
		return this.getContainerParents(limit, true);
	},

	/**
	 * TODO: the commonAncestorContainer is not calculated correctly, if either the start or
	 * the endContainer would be the cac itself (e.g. when the startContainer is a textNode
	 * and the endContainer is the startContainer's parent <p>). in this case the cac will be set
	 * to the parent div
	 * Method to update a range object internally
	 * @param commonAncestorContainer (DOM Object); optional Parameter; if set, the parameter
	 * will be used instead of the automatically calculated CAC
	 * @return void
	 * @hide
	 */
	updateCommonAncestorContainer: function(commonAncestorContainer) {
		// this will be needed either right now for finding the CAC or later for the crossing index
		var parentsStartContainer = this.getStartContainerParents(),
			parentsEndContainer = this.getEndContainerParents(),
			i;

		// if no parameter was passed, calculate it
		if (!commonAncestorContainer) {
			// find the crossing between startContainer and endContainer parents (=commonAncestorContainer)
			if (!(parentsStartContainer.length > 0 && parentsEndContainer.length > 0)) {
				console.warn('could not find commonAncestorContainer');
				return false;
			}

			for (i = 0; i < parentsStartContainer.length; i++) {
				if (parentsEndContainer.index( parentsStartContainer[ i ] ) != -1) {
					this.commonAncestorContainer = parentsStartContainer[ i ];
					break;
				}
			}
		} else {
			this.commonAncestorContainer = commonAncestorContainer;
		}

		// if everything went well, return true :-)
		console.debug(commonAncestorContainer? 'commonAncestorContainer was set successfully' : 'commonAncestorContainer was calculated successfully');
		return true;
	},

	/**
	 * Helper function for selection in IE. Creates a collapsed text range at the given position
	 * @param container container
	 * @param offset offset
	 * @return collapsed text range at that position
	 * @hide
	 */
	getCollapsedIERange: function(container, offset) {
		// create a text range
		var
			ieRange = document.body.createTextRange(),
			tmpRange, right, parent, left;

		// search to the left for the next element
		left = this.searchElementToLeft(container, offset);
		if (left.element) {
			// found an element, set the start to the end of that element
			tmpRange = document.body.createTextRange();
			tmpRange.moveToElementText(left.element);
			ieRange.setEndPoint('StartToEnd', tmpRange);

			// and correct the start
			if (left.characters !== 0) {
				ieRange.moveStart('character', left.characters);
			} else {
				// this is a hack, when we are at the start of a text node, move the range anyway
				ieRange.moveStart('character', 1);
				ieRange.moveStart('character', -1);
			}
		} else {
			// found nothing to the left, so search right
			right = this.searchElementToRight(container, offset);
			if (false && right.element) {
				// found an element, set the start to the start of that element
				tmpRange = document.body.createTextRange();
				tmpRange.moveToElementText(right.element);
				ieRange.setEndPoint('StartToStart', tmpRange);

				// and correct the start
				if (right.characters !== 0) {
					ieRange.moveStart('character', -right.characters);
				} else {
					ieRange.moveStart('character', -1);
					ieRange.moveStart('character', 1);
				}
			} else {
				// also found no element to the right, use the container itself
				parent = container.nodeType == 3 ? container.parentNode : container;
				tmpRange = document.body.createTextRange();
				tmpRange.moveToElementText(parent);
				ieRange.setEndPoint('StartToStart', tmpRange);

				// and correct the start
				if (left.characters !== 0) {
					ieRange.moveStart('character', left.characters);
				}
			}
		}
		ieRange.collapse();

		return ieRange;
	},

	/**
	 * Sets the visible selection in the Browser based on the range object.
	 * If the selection is collapsed, this will result in a blinking cursor,
	 * otherwise in a text selection.
	 * @method
	 */
	select: function() {
		var ieRange, endRange, startRange, range, sel;

		// create a range
		range = rangy.createRange();

		// set start and endContainer
		range.setStart(this.startContainer,this.startOffset);
		range.setEnd(this.endContainer, this.endOffset);

		// update the selection
		sel = rangy.getSelection();
		sel.setSingleRange(range);
	},

	/**
	 * Starting at the given position, search for the next element to the left and count the number of characters are in between
	 * @param container container of the startpoint
	 * @param offset offset of the startpoint in the container
	 * @return object with 'element' (null if no element found) and 'characters'
	 * @hide
	 */
	searchElementToLeft: function (container, offset) {
		var
			checkElement,
			characters = 0;

		if (container.nodeType === 3) {
			// start is in a text node
			characters = offset;
			// begin check at the element to the left (if any)
			checkElement = container.previousSibling;
		} else {
			// start is between nodes, begin check at the element to the left (if any)
			if (offset > 0) {
				checkElement = container.childNodes[offset - 1];
			}
		}

		// move to the right until we find an element
		while (checkElement && checkElement.nodeType === 3) {
			characters += checkElement.data.length;
			checkElement = checkElement.previousSibling;
		}

		return {'element' : checkElement, 'characters' : characters};
	},

	/**
	 * Starting at the given position, search for the next element to the right and count the number of characters that are in between
	 * @param container container of the startpoint
	 * @param offset offset of the startpoint in the container
	 * @return object with 'element' (null if no element found) and 'characters'
	 * @hide
	 */
	searchElementToRight: function (container, offset) {
		var
			checkElement,
			characters = 0;

		if (container.nodeType === 3) {
			// start is in a text node
			characters = container.data.length - offset;

			// begin check at the element to the right (if any)
			checkElement = container.nextSibling;
		} else {
			// start is between nodes, begin check at the element to the right (if any)
			if (offset < container.childNodes.length) {
				checkElement = container.childNodes[offset];
			}
		}

		// move to the right until we find an element
		while (checkElement && checkElement.nodeType === 3) {
			characters += checkElement.data.length;
			checkElement = checkElement.nextSibling;
		}

		return {'element' : checkElement, 'characters' : characters};
	},

	/**
	 * Method which updates the rangeObject including all extending properties like commonAncestorContainer etc...
	 * TODO: is this method needed here? or should it contain the same code as Aloha.Selection.prototype.SelectionRange.prototype.update?
	 * @return void
	 * @hide
	 */
	update: function(event) {
		console.debug('now updating rangeObject');
		this.initializeFromUserSelection(event);
		this.updateCommonAncestorContainer();
	},

	/**
	 * Initialize the current range object from the user selection of the browser.
	 * @param event which calls the method
	 * @return void
	 * @hide
	 */
	initializeFromUserSelection: function(event) {
		var
			selection = rangy.getSelection(),
			browserRange;

		if (!selection) {
			return false;
		}

		// check if a ragne exists
		if ( !selection.rangeCount ) {
			return false;
		}

		// getBrowserRange
		browserRange = selection.getRangeAt(0);
		if (!browserRange) {
			return false;
		}

		// initially set the range to what the browser tells us
		this.startContainer = browserRange.startContainer;
		this.endContainer = browserRange.endContainer;
		this.startOffset = browserRange.startOffset;
		this.endOffset = browserRange.endOffset;

		// now try to correct the range
		this.correctRange();
		return;
	},

	/**
	 * Correct the current range. The general goal of the algorithm is to have start
	 * and end of the range in text nodes if possible and the end of the range never
	 * at the beginning of an element or text node. Details of the algorithm can be
	 * found in the code comments
	 * @method
	 */
	correctRange: function() {
		var
			adjacentTextNode,
			textNode,
			checkedElement,
			parentNode,
			offset;

		this.clearCaches();
		if (this.isCollapsed()) {
			// collapsed ranges are treated specially

			// first check if the range is not in a text node
			if (this.startContainer.nodeType === 1) {
				if (this.startOffset > 0 && this.startContainer.childNodes[this.startOffset - 1].nodeType === 3) {
					// when the range is between nodes (container is an element
					// node) and there is a text node to the left -> move into this text
					// node (at the end)
					this.startContainer = this.startContainer.childNodes[this.startOffset - 1];
					this.startOffset = this.startContainer.data.length;
					this.endContainer = this.startContainer;
					this.endOffset = this.startOffset;
					return;
				}

				if (this.startOffset > 0 && this.startContainer.childNodes[this.startOffset - 1].nodeType === 1) {
					// search for the next text node to the left
					adjacentTextNode = GENTICS.Utils.Dom.searchAdjacentTextNode(this.startContainer, this.startOffset, true);
					if (adjacentTextNode) {
						this.startContainer = this.endContainer = adjacentTextNode;
						this.startOffset = this.endOffset = adjacentTextNode.data.length;
						return;
					}
					// search for the next text node to the right
					adjacentTextNode = GENTICS.Utils.Dom.searchAdjacentTextNode(this.startContainer, this.startOffset, false);
					if (adjacentTextNode) {
						this.startContainer = this.endContainer = adjacentTextNode;
						this.startOffset = this.endOffset = 0;
						return;
					}
				}

				if (this.startOffset < this.startContainer.childNodes.length && this.startContainer.childNodes[this.startOffset].nodeType === 3) {
					// when the range is between nodes and there is a text node
					// to the right -> move into this text node (at the start)
					this.startContainer = this.startContainer.childNodes[this.startOffset];
					this.startOffset = 0;
					this.endContainer = this.startContainer;
					this.endOffset = 0;
					return;
				}
			}

			// when the selection is in a text node at the start, look for an adjacent text node and if one found, move into that at the end
			if (this.startContainer.nodeType === 3 && this.startOffset === 0) {
				adjacentTextNode = GENTICS.Utils.Dom.searchAdjacentTextNode(this.startContainer.parentNode, GENTICS.Utils.Dom.getIndexInParent(this.startContainer), true);
				if (adjacentTextNode) {
					this.startContainer = this.endContainer = adjacentTextNode;
					this.startOffset = this.endOffset = adjacentTextNode.data.length;
				}
			}
		} else {
			// expanded range found

			// correct the start, but only if between nodes
			if (this.startContainer.nodeType === 1) {
				// if there is a text node to the right, move into this
				if (this.startOffset < this.startContainer.childNodes.length && this.startContainer.childNodes[this.startOffset].nodeType === 3) {
					this.startContainer = this.startContainer.childNodes[this.startOffset];
					this.startOffset = 0;
				} else if (this.startOffset < this.startContainer.childNodes.length && this.startContainer.childNodes[this.startOffset].nodeType === 1) {
					// there is an element node to the right, so recursively check all first child nodes until we find a text node
					textNode = false;
					checkedElement = this.startContainer.childNodes[this.startOffset];
					while (textNode === false && checkedElement.childNodes && checkedElement.childNodes.length > 0) {
						// go to the first child of the checked element
						checkedElement = checkedElement.childNodes[0];
						// when this element is a text node, we are done
						if (checkedElement.nodeType === 3) {
							textNode = checkedElement;
						}
					}

					// found a text node, so move into it
					if (textNode !== false) {
						this.startContainer = textNode;
						this.startOffset = 0;
					}
				}
			}

			// check whether the start is inside a text node at the end
			if (this.startContainer.nodeType === 3 && this.startOffset === this.startContainer.data.length) {
				// check whether there is an adjacent text node to the right and if
				// yes, move into it
				adjacentTextNode = GENTICS.Utils.Dom
						.searchAdjacentTextNode(this.startContainer.parentNode, GENTICS.Utils.Dom
						.getIndexInParent(this.startContainer) + 1, false);
				if (adjacentTextNode) {
					this.startContainer = adjacentTextNode;
					this.startOffset = 0;
				}
			}

			// now correct the end
			if (this.endContainer.nodeType === 3 && this.endOffset === 0) {
				// we are in a text node at the start
				if (this.endContainer.previousSibling && this.endContainer.previousSibling.nodeType === 3) {
					// found a text node to the left -> move into it (at the end)
					this.endContainer = this.endContainer.previousSibling;
					this.endOffset = this.endContainer.data.length;
				} else if (this.endContainer.previousSibling && this.endContainer.previousSibling.nodeType === 1 && this.endContainer.parentNode) {
					// found an element node to the left -> move in between
					parentNode = this.endContainer.parentNode;
					for (offset = 0; offset < parentNode.childNodes.length; ++offset) {
						if (parentNode.childNodes[offset] == this.endContainer) {
							this.endOffset = offset;
							break;
						}
					}
					this.endContainer = parentNode;
				}
			}

			if (this.endContainer.nodeType == 1 && this.endOffset === 0) {
				// we are in an element node at the start, possibly move to the previous sibling at the end
				if (this.endContainer.previousSibling) {
					if (this.endContainer.previousSibling.nodeType === 3) {
						// previous sibling is a text node, move end into here (at the end)
						this.endContainer = this.endContainer.previousSibling;
						this.endOffset = this.endContainer.data.length;
					} else if (
							this.endContainer.previousSibling.nodeType === 1
							&& this.endContainer.previousSibling.childNodes
							&& this.endContainer.previousSibling.childNodes.length > 0) {
						// previous sibling is another element node with children,
						// move end into here (at the end)
						this.endContainer = this.endContainer.previousSibling;
						this.endOffset = this.endContainer.childNodes.length;
					}
				}
			}

			// correct the end, but only if between nodes
			if (this.endContainer.nodeType == 1) {
				// if there is a text node to the left, move into this
				if (this.endOffset > 0 && this.endContainer.childNodes[this.endOffset - 1].nodeType === 3) {
					this.endContainer = this.endContainer.childNodes[this.endOffset - 1];
					this.endOffset = this.endContainer.data.length;
				} else if (this.endOffset > 0 && this.endContainer.childNodes[this.endOffset - 1].nodeType === 1) {
					// there is an element node to the left, so recursively check all last child nodes until we find a text node
					textNode = false;
					checkedElement = this.endContainer.childNodes[this.endOffset - 1];
					while (textNode === false && checkedElement.childNodes && checkedElement.childNodes.length > 0) {
						// go to the last child of the checked element
						checkedElement = checkedElement.childNodes[checkedElement.childNodes.length - 1];
						// when this element is a text node, we are done
						if (checkedElement.nodeType === 3) {
							textNode = checkedElement;
						}
					}

					// found a text node, so move into it
					if (textNode !== false) {
						this.endContainer = textNode;
						this.endOffset = this.endContainer.data.length;
					}
				}
			}
		}
	},

	/**
	 * Clear the caches for this range. This method must be called when the range itself (start-/endContainer or start-/endOffset) is modified.
	 * @method
	 */
	clearCaches: function () {
		this.commonAncestorContainer = undefined;
	},

	/**
	 * Get the range tree of this range.
	 * The range tree will be cached for every root object. When the range itself is modified, the cache should be cleared by calling GENTICS.Utils.RangeObject.clearCaches
	 * @param {DOMObject} root root object of the range tree, if non given, the common ancestor container of the start and end containers will be used
	 * @return {RangeTree} array of RangeTree object for the given root object
	 * @method
	 */
	getRangeTree: function (root) {
		// TODO cache rangeTrees
		if (typeof root === 'undefined') {
			root = this.getCommonAncestorContainer();
		}

		this.inselection = false;
		return this.recursiveGetRangeTree(root);
	},

	/**
	 * Recursive inner function for generating the range tree.
	 * @param currentObject current DOM object for which the range tree shall be generated
	 * @return array of Tree objects for the children of the current DOM object
	 * @hide
	 */
	recursiveGetRangeTree: function (currentObject) {
		// get all direct children of the given object
		var jQueryCurrentObject = jQuery(currentObject),
			childCount = 0,
			that = this,
			currentElements = [];

		jQueryCurrentObject.contents().each(function(index) {
			var type = 'none',
				startOffset = false,
				endOffset = false,
				collapsedFound = false,
				noneFound = false,
				partialFound = false,
				fullFound = false,
				i;

			// check for collapsed selections between nodes
			if (that.isCollapsed() && currentObject === that.startContainer && that.startOffset === index) {
				// insert an extra rangetree object for the collapsed range here
				currentElements[childCount] = new GENTICS.Utils.RangeTree();
				currentElements[childCount].type = 'collapsed';
				currentElements[childCount].domobj = undefined;
				that.inselection = false;
				collapsedFound = true;
				childCount++;
			}

			if (!that.inselection && !collapsedFound) {
				// the start of the selection was not yet found, so look for it now
				// check whether the start of the selection is found here

				// check is dependent on the node type
				switch(this.nodeType) {
				case 3: // text node
					if (this === that.startContainer) {
						// the selection starts here
						that.inselection = true;

						// when the startoffset is > 0, the selection type is only partial
						type = that.startOffset > 0 ? 'partial' : 'full';
						startOffset = that.startOffset;
						endOffset = this.length;
					}
					break;
				case 1: // element node
					if (this === that.startContainer && that.startOffset === 0) {
						// the selection starts here
						that.inselection = true;
						type = 'full';
					}
					if (currentObject === that.startContainer && that.startOffset === index) {
						// the selection starts here
						that.inselection = true;
						type = 'full';
					}
					break;
				}
			}

			if (that.inselection && !collapsedFound) {
				if (type == 'none') {
					type = 'full';
				}
				// we already found the start of the selection, so look for the end of the selection now
				// check whether the end of the selection is found here

				switch(this.nodeType) {
				case 3: // text node
					if (this === that.endContainer) {
						// the selection ends here
						that.inselection = false;

						// check for partial selection here
						if (that.endOffset < this.length) {
							type = 'partial';
						}
						if (startOffset === false) {
							startOffset = 0;
						}
						endOffset = that.endOffset;
					}
					break;
				case 1: // element node
					if (this === that.endContainer && that.endOffset === 0) {
						that.inselection = false;
					}
					break;
				}
				if (currentObject === that.endContainer && that.endOffset <= index) {
					that.inselection = false;
					type = 'none';
				}
			}

			// create the current selection tree entry
			currentElements[childCount] = new GENTICS.Utils.RangeTree();
			currentElements[childCount].domobj = this;
			currentElements[childCount].type = type;
			if (type == 'partial') {
				currentElements[childCount].startOffset = startOffset;
				currentElements[childCount].endOffset = endOffset;
			}

			// now do the recursion step into the current object
			currentElements[childCount].children = that.recursiveGetRangeTree(this);

			// check whether a selection was found within the children
			if (currentElements[childCount].children.length > 0) {
				for ( i = 0; i < currentElements[childCount].children.length; ++i) {
					switch(currentElements[childCount].children[i].type) {
					case 'none':
						noneFound = true;
						break;
					case 'full':
						fullFound = true;
						break;
					case 'partial':
						partialFound = true;
						break;
					}
				}

				if (partialFound || (fullFound && noneFound)) {
					// found at least one 'partial' DOM object in the children, or both 'full' and 'none', so this element is also 'partial' contained
					currentElements[childCount].type = 'partial';
				} else if (fullFound && !partialFound && !noneFound) {
					// only found 'full' contained children, so this element is also 'full' contained
					currentElements[childCount].type = 'full';
				}
			}

			childCount++;
		});

		// extra check for collapsed selections at the end of the current element
		if (this.isCollapsed()
				&& currentObject === this.startContainer
				&& this.startOffset == currentObject.childNodes.length) {
			currentElements[childCount] = new GENTICS.Utils.RangeTree();
			currentElements[childCount].type = 'collapsed';
			currentElements[childCount].domobj = undefined;
		}

		return currentElements;
	},

	/**
	 * Find certain the first occurrence of some markup within the parents of either the start or the end of this range.
	 * The markup can be identified by means of a given comparator function. The function will be passed every parent (up to the eventually given limit object, which itself is not considered) to the comparator function as this.
	 * When the comparator function returns boolean true, the markup found and finally returned from this function as dom object.<br/>
	 * Example for finding an anchor tag at the start of the range up to the active editable object:<br/>
	 * <pre>
	 * range.findMarkup(
	 *   function() {
	 *     return this.nodeName.toLowerCase() == 'a';
	 *   },
	 *   jQuery(Aloha.activeEditable.obj)
	 * );
	 * </pre>
	 * @param {function} comparator comparator function to find certain markup
	 * @param {jQuery} limit limit objects for limit the parents taken into consideration
	 * @param {boolean} atEnd true for searching at the end of the range, false for the start (default: false)
	 * @return {DOMObject} the found dom object or false if nothing found.
	 * @method
	 */
	findMarkup: function (comparator, limit, atEnd) {
		var parents = this.getContainerParents(limit, atEnd),
			returnValue = false;
		jQuery.each(parents, function (index, domObj) {
			if (comparator.apply(domObj)) {
				returnValue = domObj;
				return false;
			}
		});

		return returnValue;
	},

	/**
	 * Get the text enclosed by this range
	 * @return {String} the text of the range
	 * @method
	 */
	getText: function() {
		if (this.isCollapsed()) {
			return '';
		} else {
			return this.recursiveGetText(this.getRangeTree());
		}
	},

	recursiveGetText: function (tree) {
		if (!tree) {
			return '';
		} else {
			var that = this,
				text = '';
			jQuery.each(tree, function() {
				if (this.type == 'full') {
					// fully selected element/text node
					text += jQuery(this.domobj).text();
				} else if (this.type == 'partial' && this.domobj.nodeType === 3) {
					// partially selected text node
					text += jQuery(this.domobj).text().substring(this.startOffset, this.endOffset);
				} else if (this.type == 'partial' && this.domobj.nodeType === 1 && this.children) {
					// partially selected element node
					text += that.recursiveGetText(this.children);
				}
			});
			return text;
		}
	}
});

/**
 * @namespace GENTICS.Utils
 * @class RangeTree
 * Class definition of a RangeTree, which gives a tree view of the DOM objects included in this range
 * Structure:
 * <pre>
 * +
 * |-domobj: <reference to the DOM Object> (NOT jQuery)
 * |-type: defines if this node is marked by user [none|partial|full|collapsed]
 * |-children: recursive structure like this
 * </pre>
 */
GENTICS.Utils.RangeTree = Class.extend({
	/**
	 * DOMObject, if the type is one of [none|partial|full], undefined if the type is [collapsed]
	 * @property domobj
	 * @type {DOMObject}
	 */
	domobj: {},

	/**
	 * type of the participation of the dom object in the range. Is one of:
	 * <pre>
	 * - none the DOMObject is outside of the range
	 * - partial the DOMObject partially in the range
	 * - full the DOMObject is completely in the range
	 * - collapsed the current RangeTree element marks the position of a collapsed range between DOM nodes
	 * </pre>
	 * @property type
	 * @type {String}
	 */
	type: null,

	/**
	 * Array of RangeTree objects which reflect the status of the child elements of the current DOMObject
	 * @property children
	 * @type {Array}
	 */
	children: []
});
	
	return GENTICS.Utils.RangeObject;
});