'use strict';

var circle = require('@turf/circle');
var lineArc = require('@turf/line-arc');
var meta = require('@turf/meta');
var helpers = require('@turf/helpers');
var invariant = require('@turf/invariant');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var circle__default = /*#__PURE__*/_interopDefaultLegacy(circle);
var lineArc__default = /*#__PURE__*/_interopDefaultLegacy(lineArc);

/**
 * Creates a circular sector of a circle of given radius and center {@link Point},
 * between (clockwise) bearing1 and bearing2; 0 bearing is North of center point, positive clockwise.
 *
 * @name sector
 * @param {Coord} center center point
 * @param {number} radius radius of the circle
 * @param {number} bearing1 angle, in decimal degrees, of the first radius of the sector
 * @param {number} bearing2 angle, in decimal degrees, of the second radius of the sector
 * @param {Object} [options={}] Optional parameters
 * @param {string} [options.units='kilometers'] miles, kilometers, degrees, or radians
 * @param {number} [options.steps=64] number of steps
 * @param {Properties} [options.properties={}] Translate properties to Feature Polygon
 * @returns {Feature<Polygon>} sector polygon
 * @example
 * var center = turf.point([-75, 40]);
 * var radius = 5;
 * var bearing1 = 25;
 * var bearing2 = 45;
 *
 * var sector = turf.sector(center, radius, bearing1, bearing2);
 *
 * //addToMap
 * var addToMap = [center, sector];
 */
function sector(center, radius, bearing1, bearing2, options) {
  // Optional parameters
  options = options || {};
  if (!helpers.isObject(options)) throw new Error("options is invalid");
  var properties = options.properties;

  // validation
  if (!center) throw new Error("center is required");
  if (bearing1 === undefined || bearing1 === null)
    throw new Error("bearing1 is required");
  if (bearing2 === undefined || bearing2 === null)
    throw new Error("bearing2 is required");
  if (!radius) throw new Error("radius is required");
  if (typeof options !== "object") throw new Error("options must be an object");

  if (convertAngleTo360(bearing1) === convertAngleTo360(bearing2)) {
    return circle__default['default'](center, radius, options);
  }
  var coords = invariant.getCoords(center);
  var arc = lineArc__default['default'](center, radius, bearing1, bearing2, options);
  var sliceCoords = [[coords]];
  meta.coordEach(arc, function (currentCoords) {
    sliceCoords[0].push(currentCoords);
  });
  sliceCoords[0].push(coords);

  return helpers.polygon(sliceCoords, properties);
}

/**
 * Takes any angle in degrees
 * and returns a valid angle between 0-360 degrees
 *
 * @private
 * @param {number} alfa angle between -180-180 degrees
 * @returns {number} angle between 0-360 degrees
 */
function convertAngleTo360(alfa) {
  var beta = alfa % 360;
  if (beta < 0) beta += 360;
  return beta;
}

module.exports = sector;
module.exports.default = sector;