import centroid from '@turf/centroid';
import rhumbBearing from '@turf/rhumb-bearing';
import rhumbDistance from '@turf/rhumb-distance';
import rhumbDestination from '@turf/rhumb-destination';
import clone from '@turf/clone';
import { coordEach } from '@turf/meta';
import { getCoords } from '@turf/invariant';
import { isObject } from '@turf/helpers';

/**
 * Rotates any geojson Feature or Geometry of a specified angle, around its `centroid` or a given `pivot` point.
 *
 * @name transformRotate
 * @param {GeoJSON} geojson object to be rotated
 * @param {number} angle of rotation in decimal degrees, positive clockwise
 * @param {Object} [options={}] Optional parameters
 * @param {Coord} [options.pivot='centroid'] point around which the rotation will be performed
 * @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
 * @returns {GeoJSON} the rotated GeoJSON feature
 * @example
 * var poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
 * var options = {pivot: [0, 25]};
 * var rotatedPoly = turf.transformRotate(poly, 10, options);
 *
 * //addToMap
 * var addToMap = [poly, rotatedPoly];
 * rotatedPoly.properties = {stroke: '#F00', 'stroke-width': 4};
 */
function transformRotate(geojson, angle, options) {
  // Optional parameters
  options = options || {};
  if (!isObject(options)) throw new Error("options is invalid");
  var pivot = options.pivot;
  var mutate = options.mutate;

  // Input validation
  if (!geojson) throw new Error("geojson is required");
  if (angle === undefined || angle === null || isNaN(angle))
    throw new Error("angle is required");

  // Shortcut no-rotation
  if (angle === 0) return geojson;

  // Use centroid of GeoJSON if pivot is not provided
  if (!pivot) pivot = centroid(geojson);

  // Clone geojson to avoid side effects
  if (mutate === false || mutate === undefined) geojson = clone(geojson);

  // Rotate each coordinate
  coordEach(geojson, function (pointCoords) {
    var initialAngle = rhumbBearing(pivot, pointCoords);
    var finalAngle = initialAngle + angle;
    var distance = rhumbDistance(pivot, pointCoords);
    var newCoords = getCoords(rhumbDestination(pivot, distance, finalAngle));
    pointCoords[0] = newCoords[0];
    pointCoords[1] = newCoords[1];
  });
  return geojson;
}

export default transformRotate;