/**
 * Cesium - https://github.com/AnalyticalGraphicsInc/cesium
 *
 * Copyright 2011-2017 Cesium Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Columbus View (Pat. Pend.)
 *
 * Portions licensed separately.
 * See https://github.com/AnalyticalGraphicsInc/cesium/blob/master/LICENSE.md for full licensing details.
 */
define(['exports', './when-a55a8a4c', './Check-bc1d37d9', './Cartesian2-52d9479f', './BoundingSphere-ab31357a'], function (exports, when, Check, Cartesian2, BoundingSphere) { 'use strict';

    /**
         * A bounding rectangle given by a corner, width and height.
         * @alias BoundingRectangle
         * @constructor
         *
         * @param {Number} [x=0.0] The x coordinate of the rectangle.
         * @param {Number} [y=0.0] The y coordinate of the rectangle.
         * @param {Number} [width=0.0] The width of the rectangle.
         * @param {Number} [height=0.0] The height of the rectangle.
         *
         * @see BoundingSphere
         * @see Packable
         */
        function BoundingRectangle(x, y, width, height) {
            /**
             * The x coordinate of the rectangle.
             * @type {Number}
             * @default 0.0
             */
            this.x = when.defaultValue(x, 0.0);

            /**
             * The y coordinate of the rectangle.
             * @type {Number}
             * @default 0.0
             */
            this.y = when.defaultValue(y, 0.0);

            /**
             * The width of the rectangle.
             * @type {Number}
             * @default 0.0
             */
            this.width = when.defaultValue(width, 0.0);

            /**
             * The height of the rectangle.
             * @type {Number}
             * @default 0.0
             */
            this.height = when.defaultValue(height, 0.0);
        }

        /**
         * The number of elements used to pack the object into an array.
         * @type {Number}
         */
        BoundingRectangle.packedLength = 4;

        /**
         * Stores the provided instance into the provided array.
         *
         * @param {BoundingRectangle} value The value to pack.
         * @param {Number[]} array The array to pack into.
         * @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
         *
         * @returns {Number[]} The array that was packed into
         */
        BoundingRectangle.pack = function(value, array, startingIndex) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('value', value);
            Check.Check.defined('array', array);
            //>>includeEnd('debug');

            startingIndex = when.defaultValue(startingIndex, 0);

            array[startingIndex++] = value.x;
            array[startingIndex++] = value.y;
            array[startingIndex++] = value.width;
            array[startingIndex] = value.height;

            return array;
        };

        /**
         * Retrieves an instance from a packed array.
         *
         * @param {Number[]} array The packed array.
         * @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
         * @param {BoundingRectangle} [result] The object into which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.unpack = function(array, startingIndex, result) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.defined('array', array);
            //>>includeEnd('debug');

            startingIndex = when.defaultValue(startingIndex, 0);

            if (!when.defined(result)) {
                result = new BoundingRectangle();
            }
            result.x = array[startingIndex++];
            result.y = array[startingIndex++];
            result.width = array[startingIndex++];
            result.height = array[startingIndex];
            return result;
        };

        /**
         * Computes a bounding rectangle enclosing the list of 2D points.
         * The rectangle is oriented with the corner at the bottom left.
         *
         * @param {Cartesian2[]} positions List of points that the bounding rectangle will enclose.  Each point must have <code>x</code> and <code>y</code> properties.
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.fromPoints = function(positions, result) {
            if (!when.defined(result)) {
                result = new BoundingRectangle();
            }

            if (!when.defined(positions) || positions.length === 0) {
                result.x = 0;
                result.y = 0;
                result.width = 0;
                result.height = 0;
                return result;
            }

            var length = positions.length;

            var minimumX = positions[0].x;
            var minimumY = positions[0].y;

            var maximumX = positions[0].x;
            var maximumY = positions[0].y;

            for ( var i = 1; i < length; i++) {
                var p = positions[i];
                var x = p.x;
                var y = p.y;

                minimumX = Math.min(x, minimumX);
                maximumX = Math.max(x, maximumX);
                minimumY = Math.min(y, minimumY);
                maximumY = Math.max(y, maximumY);
            }

            result.x = minimumX;
            result.y = minimumY;
            result.width = maximumX - minimumX;
            result.height = maximumY - minimumY;
            return result;
        };

        var defaultProjection = new BoundingSphere.GeographicProjection();
        var fromRectangleLowerLeft = new Cartesian2.Cartographic();
        var fromRectangleUpperRight = new Cartesian2.Cartographic();
        /**
         * Computes a bounding rectangle from a rectangle.
         *
         * @param {Rectangle} rectangle The valid rectangle used to create a bounding rectangle.
         * @param {Object} [projection=GeographicProjection] The projection used to project the rectangle into 2D.
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.fromRectangle = function(rectangle, projection, result) {
            if (!when.defined(result)) {
                result = new BoundingRectangle();
            }

            if (!when.defined(rectangle)) {
                result.x = 0;
                result.y = 0;
                result.width = 0;
                result.height = 0;
                return result;
            }

            projection = when.defaultValue(projection, defaultProjection);

            var lowerLeft = projection.project(Cartesian2.Rectangle.southwest(rectangle, fromRectangleLowerLeft));
            var upperRight = projection.project(Cartesian2.Rectangle.northeast(rectangle, fromRectangleUpperRight));

            Cartesian2.Cartesian2.subtract(upperRight, lowerLeft, upperRight);

            result.x = lowerLeft.x;
            result.y = lowerLeft.y;
            result.width = upperRight.x;
            result.height = upperRight.y;
            return result;
        };

        /**
         * Duplicates a BoundingRectangle instance.
         *
         * @param {BoundingRectangle} rectangle The bounding rectangle to duplicate.
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided. (Returns undefined if rectangle is undefined)
         */
        BoundingRectangle.clone = function(rectangle, result) {
            if (!when.defined(rectangle)) {
                return undefined;
            }

            if (!when.defined(result)) {
                return new BoundingRectangle(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
            }

            result.x = rectangle.x;
            result.y = rectangle.y;
            result.width = rectangle.width;
            result.height = rectangle.height;
            return result;
        };

        /**
         * Computes a bounding rectangle that is the union of the left and right bounding rectangles.
         *
         * @param {BoundingRectangle} left A rectangle to enclose in bounding rectangle.
         * @param {BoundingRectangle} right A rectangle to enclose in a bounding rectangle.
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.union = function(left, right, result) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('left', left);
            Check.Check.typeOf.object('right', right);
            //>>includeEnd('debug');

            if (!when.defined(result)) {
                result = new BoundingRectangle();
            }

            var lowerLeftX = Math.min(left.x, right.x);
            var lowerLeftY = Math.min(left.y, right.y);
            var upperRightX = Math.max(left.x + left.width, right.x + right.width);
            var upperRightY = Math.max(left.y + left.height, right.y + right.height);

            result.x = lowerLeftX;
            result.y = lowerLeftY;
            result.width = upperRightX - lowerLeftX;
            result.height = upperRightY - lowerLeftY;
            return result;
        };

        /**
         * Computes a bounding rectangle by enlarging the provided rectangle until it contains the provided point.
         *
         * @param {BoundingRectangle} rectangle A rectangle to expand.
         * @param {Cartesian2} point A point to enclose in a bounding rectangle.
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.expand = function(rectangle, point, result) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('rectangle', rectangle);
            Check.Check.typeOf.object('point', point);
            //>>includeEnd('debug');

            result = BoundingRectangle.clone(rectangle, result);

            var width = point.x - result.x;
            var height = point.y - result.y;

            if (width > result.width) {
                result.width = width;
            } else if (width < 0) {
                result.width -= width;
                result.x = point.x;
            }

            if (height > result.height) {
                result.height = height;
            } else if (height < 0) {
                result.height -= height;
                result.y = point.y;
            }

            return result;
        };

        /**
         * Determines if two rectangles intersect.
         *
         * @param {BoundingRectangle} left A rectangle to check for intersection.
         * @param {BoundingRectangle} right The other rectangle to check for intersection.
         * @returns {Intersect} <code>Intersect.INTESECTING</code> if the rectangles intersect, <code>Intersect.OUTSIDE</code> otherwise.
         */
        BoundingRectangle.intersect = function(left, right) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('left', left);
            Check.Check.typeOf.object('right', right);
            //>>includeEnd('debug');

            var leftX = left.x;
            var leftY = left.y;
            var rightX = right.x;
            var rightY = right.y;
            if (!(leftX > rightX + right.width ||
                  leftX + left.width < rightX ||
                  leftY + left.height < rightY ||
                  leftY > rightY + right.height)) {
                return BoundingSphere.Intersect.INTERSECTING;
            }

            return BoundingSphere.Intersect.OUTSIDE;
        };

        /**
         * Compares the provided BoundingRectangles componentwise and returns
         * <code>true</code> if they are equal, <code>false</code> otherwise.
         *
         * @param {BoundingRectangle} [left] The first BoundingRectangle.
         * @param {BoundingRectangle} [right] The second BoundingRectangle.
         * @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
         */
        BoundingRectangle.equals = function(left, right) {
            return (left === right) ||
                   ((when.defined(left)) &&
                    (when.defined(right)) &&
                    (left.x === right.x) &&
                    (left.y === right.y) &&
                    (left.width === right.width) &&
                    (left.height === right.height));
        };

        /**
         * Duplicates this BoundingRectangle instance.
         *
         * @param {BoundingRectangle} [result] The object onto which to store the result.
         * @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
         */
        BoundingRectangle.prototype.clone = function(result) {
            return BoundingRectangle.clone(this, result);
        };

        /**
         * Determines if this rectangle intersects with another.
         *
         * @param {BoundingRectangle} right A rectangle to check for intersection.
         * @returns {Intersect} <code>Intersect.INTESECTING</code> if the rectangles intersect, <code>Intersect.OUTSIDE</code> otherwise.
         */
        BoundingRectangle.prototype.intersect = function(right) {
            return BoundingRectangle.intersect(this, right);
        };

        /**
         * Compares this BoundingRectangle against the provided BoundingRectangle componentwise and returns
         * <code>true</code> if they are equal, <code>false</code> otherwise.
         *
         * @param {BoundingRectangle} [right] The right hand side BoundingRectangle.
         * @returns {Boolean} <code>true</code> if they are equal, <code>false</code> otherwise.
         */
        BoundingRectangle.prototype.equals = function(right) {
            return BoundingRectangle.equals(this, right);
        };

    exports.BoundingRectangle = BoundingRectangle;

});
