// http://en.wikipedia.org/wiki/Haversine_formula
// http://www.movable-type.co.uk/scripts/latlong.html
import { degreesToRadians, lengthToRadians, point, radiansToDegrees, } from "@turf/helpers";
import { getCoord } from "@turf/invariant";
/**
 * Takes a {@link Point} and calculates the location of a destination point given a distance in
 * degrees, radians, miles, or kilometers; and bearing in degrees.
 * This uses the [Haversine formula](http://en.wikipedia.org/wiki/Haversine_formula) to account for global curvature.
 *
 * @name destination
 * @param {Coord} origin starting point
 * @param {number} distance distance from the origin point
 * @param {number} bearing ranging from -180 to 180
 * @param {Object} [options={}] Optional parameters
 * @param {string} [options.units='kilometers'] miles, kilometers, degrees, or radians
 * @param {Object} [options.properties={}] Translate properties to Point
 * @returns {Feature<Point>} destination point
 * @example
 * var point = turf.point([-75.343, 39.984]);
 * var distance = 50;
 * var bearing = 90;
 * var options = {units: 'miles'};
 *
 * var destination = turf.destination(point, distance, bearing, options);
 *
 * //addToMap
 * var addToMap = [point, destination]
 * destination.properties['marker-color'] = '#f00';
 * point.properties['marker-color'] = '#0f0';
 */
export default function destination(origin, distance, bearing, options) {
    if (options === void 0) { options = {}; }
    // Handle input
    var coordinates1 = getCoord(origin);
    var longitude1 = degreesToRadians(coordinates1[0]);
    var latitude1 = degreesToRadians(coordinates1[1]);
    var bearingRad = degreesToRadians(bearing);
    var radians = lengthToRadians(distance, options.units);
    // Main
    var latitude2 = Math.asin(Math.sin(latitude1) * Math.cos(radians) +
        Math.cos(latitude1) * Math.sin(radians) * Math.cos(bearingRad));
    var longitude2 = longitude1 +
        Math.atan2(Math.sin(bearingRad) * Math.sin(radians) * Math.cos(latitude1), Math.cos(radians) - Math.sin(latitude1) * Math.sin(latitude2));
    var lng = radiansToDegrees(longitude2);
    var lat = radiansToDegrees(latitude2);
    return point([lng, lat], options.properties);
}