/**
 * ClientRect.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * Utility functions for working with client rects.
 *
 * @private
 * @class tinymce.geom.ClientRect
 */
define("tinymce/geom/ClientRect", [], function() {
	var round = Math.round;

	function clone(rect) {
		if (!rect) {
			return {left: 0, top: 0, bottom: 0, right: 0, width: 0, height: 0};
		}

		return {
			left: round(rect.left),
			top: round(rect.top),
			bottom: round(rect.bottom),
			right: round(rect.right),
			width: round(rect.width),
			height: round(rect.height)
		};
	}

	function collapse(clientRect, toStart) {
		clientRect = clone(clientRect);

		if (toStart) {
			clientRect.right = clientRect.left;
		} else {
			clientRect.left = clientRect.left + clientRect.width;
			clientRect.right = clientRect.left;
		}

		clientRect.width = 0;

		return clientRect;
	}

	function isEqual(rect1, rect2) {
		return (
			rect1.left === rect2.left &&
			rect1.top === rect2.top &&
			rect1.bottom === rect2.bottom &&
			rect1.right === rect2.right
		);
	}

	function isValidOverflow(overflowY, clientRect1, clientRect2) {
		return overflowY >= 0 && overflowY <= Math.min(clientRect1.height, clientRect2.height) / 2;

	}

	function isAbove(clientRect1, clientRect2) {
		if (clientRect1.bottom < clientRect2.top) {
			return true;
		}

		if (clientRect1.top > clientRect2.bottom) {
			return false;
		}

		return isValidOverflow(clientRect2.top - clientRect1.bottom, clientRect1, clientRect2);
	}

	function isBelow(clientRect1, clientRect2) {
		if (clientRect1.top > clientRect2.bottom) {
			return true;
		}

		if (clientRect1.bottom < clientRect2.top) {
			return false;
		}

		return isValidOverflow(clientRect2.bottom - clientRect1.top, clientRect1, clientRect2);
	}

	function isLeft(clientRect1, clientRect2) {
		return clientRect1.left < clientRect2.left;
	}

	function isRight(clientRect1, clientRect2) {
		return clientRect1.right > clientRect2.right;
	}

	function compare(clientRect1, clientRect2) {
		if (isAbove(clientRect1, clientRect2)) {
			return -1;
		}

		if (isBelow(clientRect1, clientRect2)) {
			return 1;
		}

		if (isLeft(clientRect1, clientRect2)) {
			return -1;
		}

		if (isRight(clientRect1, clientRect2)) {
			return 1;
		}

		return 0;
	}

	return {
		clone: clone,
		collapse: collapse,
		isEqual: isEqual,
		isAbove: isAbove,
		isBelow: isBelow,
		isLeft: isLeft,
		isRight: isRight,
		compare: compare
	};
});
