/**
 * Cesium - https://github.com/CesiumGS/cesium
 *
 * Copyright 2011-2020 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/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
 */

define(['exports', './Matrix2-265d9610', './RuntimeError-5b082e8f', './when-4bbc8319', './ComponentDatatype-aad54330'], (function (exports, Matrix2, RuntimeError, when, ComponentDatatype) { 'use strict';

  function setConstants(ellipsoidGeodesic) {
    const uSquared = ellipsoidGeodesic._uSquared;
    const a = ellipsoidGeodesic._ellipsoid.maximumRadius;
    const b = ellipsoidGeodesic._ellipsoid.minimumRadius;
    const f = (a - b) / a;

    const cosineHeading = Math.cos(ellipsoidGeodesic._startHeading);
    const sineHeading = Math.sin(ellipsoidGeodesic._startHeading);

    const tanU = (1 - f) * Math.tan(ellipsoidGeodesic._start.latitude);

    const cosineU = 1.0 / Math.sqrt(1.0 + tanU * tanU);
    const sineU = cosineU * tanU;

    const sigma = Math.atan2(tanU, cosineHeading);

    const sineAlpha = cosineU * sineHeading;
    const sineSquaredAlpha = sineAlpha * sineAlpha;

    const cosineSquaredAlpha = 1.0 - sineSquaredAlpha;
    const cosineAlpha = Math.sqrt(cosineSquaredAlpha);

    const u2Over4 = uSquared / 4.0;
    const u4Over16 = u2Over4 * u2Over4;
    const u6Over64 = u4Over16 * u2Over4;
    const u8Over256 = u4Over16 * u4Over16;

    const a0 =
      1.0 +
      u2Over4 -
      (3.0 * u4Over16) / 4.0 +
      (5.0 * u6Over64) / 4.0 -
      (175.0 * u8Over256) / 64.0;
    const a1 = 1.0 - u2Over4 + (15.0 * u4Over16) / 8.0 - (35.0 * u6Over64) / 8.0;
    const a2 = 1.0 - 3.0 * u2Over4 + (35.0 * u4Over16) / 4.0;
    const a3 = 1.0 - 5.0 * u2Over4;

    const distanceRatio =
      a0 * sigma -
      (a1 * Math.sin(2.0 * sigma) * u2Over4) / 2.0 -
      (a2 * Math.sin(4.0 * sigma) * u4Over16) / 16.0 -
      (a3 * Math.sin(6.0 * sigma) * u6Over64) / 48.0 -
      (Math.sin(8.0 * sigma) * 5.0 * u8Over256) / 512;

    const constants = ellipsoidGeodesic._constants;

    constants.a = a;
    constants.b = b;
    constants.f = f;
    constants.cosineHeading = cosineHeading;
    constants.sineHeading = sineHeading;
    constants.tanU = tanU;
    constants.cosineU = cosineU;
    constants.sineU = sineU;
    constants.sigma = sigma;
    constants.sineAlpha = sineAlpha;
    constants.sineSquaredAlpha = sineSquaredAlpha;
    constants.cosineSquaredAlpha = cosineSquaredAlpha;
    constants.cosineAlpha = cosineAlpha;
    constants.u2Over4 = u2Over4;
    constants.u4Over16 = u4Over16;
    constants.u6Over64 = u6Over64;
    constants.u8Over256 = u8Over256;
    constants.a0 = a0;
    constants.a1 = a1;
    constants.a2 = a2;
    constants.a3 = a3;
    constants.distanceRatio = distanceRatio;
  }

  function computeC(f, cosineSquaredAlpha) {
    return (
      (f * cosineSquaredAlpha * (4.0 + f * (4.0 - 3.0 * cosineSquaredAlpha))) /
      16.0
    );
  }

  function computeDeltaLambda(
    f,
    sineAlpha,
    cosineSquaredAlpha,
    sigma,
    sineSigma,
    cosineSigma,
    cosineTwiceSigmaMidpoint
  ) {
    const C = computeC(f, cosineSquaredAlpha);

    return (
      (1.0 - C) *
      f *
      sineAlpha *
      (sigma +
        C *
          sineSigma *
          (cosineTwiceSigmaMidpoint +
            C *
              cosineSigma *
              (2.0 * cosineTwiceSigmaMidpoint * cosineTwiceSigmaMidpoint - 1.0)))
    );
  }

  function vincentyInverseFormula(
    ellipsoidGeodesic,
    major,
    minor,
    firstLongitude,
    firstLatitude,
    secondLongitude,
    secondLatitude
  ) {
    const eff = (major - minor) / major;
    const l = secondLongitude - firstLongitude;

    const u1 = Math.atan((1 - eff) * Math.tan(firstLatitude));
    const u2 = Math.atan((1 - eff) * Math.tan(secondLatitude));

    const cosineU1 = Math.cos(u1);
    const sineU1 = Math.sin(u1);
    const cosineU2 = Math.cos(u2);
    const sineU2 = Math.sin(u2);

    const cc = cosineU1 * cosineU2;
    const cs = cosineU1 * sineU2;
    const ss = sineU1 * sineU2;
    const sc = sineU1 * cosineU2;

    let lambda = l;
    let lambdaDot = ComponentDatatype.CesiumMath.TWO_PI;

    let cosineLambda = Math.cos(lambda);
    let sineLambda = Math.sin(lambda);

    let sigma;
    let cosineSigma;
    let sineSigma;
    let cosineSquaredAlpha;
    let cosineTwiceSigmaMidpoint;

    do {
      cosineLambda = Math.cos(lambda);
      sineLambda = Math.sin(lambda);

      const temp = cs - sc * cosineLambda;
      sineSigma = Math.sqrt(
        cosineU2 * cosineU2 * sineLambda * sineLambda + temp * temp
      );
      cosineSigma = ss + cc * cosineLambda;

      sigma = Math.atan2(sineSigma, cosineSigma);

      let sineAlpha;

      if (sineSigma === 0.0) {
        sineAlpha = 0.0;
        cosineSquaredAlpha = 1.0;
      } else {
        sineAlpha = (cc * sineLambda) / sineSigma;
        cosineSquaredAlpha = 1.0 - sineAlpha * sineAlpha;
      }

      lambdaDot = lambda;

      cosineTwiceSigmaMidpoint = cosineSigma - (2.0 * ss) / cosineSquaredAlpha;

      if (!isFinite(cosineTwiceSigmaMidpoint)) {
        cosineTwiceSigmaMidpoint = 0.0;
      }

      lambda =
        l +
        computeDeltaLambda(
          eff,
          sineAlpha,
          cosineSquaredAlpha,
          sigma,
          sineSigma,
          cosineSigma,
          cosineTwiceSigmaMidpoint
        );
    } while (Math.abs(lambda - lambdaDot) > ComponentDatatype.CesiumMath.EPSILON12);

    const uSquared =
      (cosineSquaredAlpha * (major * major - minor * minor)) / (minor * minor);
    const A =
      1.0 +
      (uSquared *
        (4096.0 + uSquared * (uSquared * (320.0 - 175.0 * uSquared) - 768.0))) /
        16384.0;
    const B =
      (uSquared *
        (256.0 + uSquared * (uSquared * (74.0 - 47.0 * uSquared) - 128.0))) /
      1024.0;

    const cosineSquaredTwiceSigmaMidpoint =
      cosineTwiceSigmaMidpoint * cosineTwiceSigmaMidpoint;
    const deltaSigma =
      B *
      sineSigma *
      (cosineTwiceSigmaMidpoint +
        (B *
          (cosineSigma * (2.0 * cosineSquaredTwiceSigmaMidpoint - 1.0) -
            (B *
              cosineTwiceSigmaMidpoint *
              (4.0 * sineSigma * sineSigma - 3.0) *
              (4.0 * cosineSquaredTwiceSigmaMidpoint - 3.0)) /
              6.0)) /
          4.0);

    const distance = minor * A * (sigma - deltaSigma);

    const startHeading = Math.atan2(
      cosineU2 * sineLambda,
      cs - sc * cosineLambda
    );
    const endHeading = Math.atan2(cosineU1 * sineLambda, cs * cosineLambda - sc);

    ellipsoidGeodesic._distance = distance;
    ellipsoidGeodesic._startHeading = startHeading;
    ellipsoidGeodesic._endHeading = endHeading;
    ellipsoidGeodesic._uSquared = uSquared;
  }

  const scratchCart1 = new Matrix2.Cartesian3();
  const scratchCart2 = new Matrix2.Cartesian3();
  function computeProperties(ellipsoidGeodesic, start, end, ellipsoid) {
    const firstCartesian = Matrix2.Cartesian3.normalize(
      ellipsoid.cartographicToCartesian(start, scratchCart2),
      scratchCart1
    );
    const lastCartesian = Matrix2.Cartesian3.normalize(
      ellipsoid.cartographicToCartesian(end, scratchCart2),
      scratchCart2
    );

    //>>includeStart('debug', pragmas.debug);
    RuntimeError.Check.typeOf.number.greaterThanOrEquals(
      "value",
      Math.abs(
        Math.abs(Matrix2.Cartesian3.angleBetween(firstCartesian, lastCartesian)) - Math.PI
      ),
      0.0125
    );
    //>>includeEnd('debug');

    vincentyInverseFormula(
      ellipsoidGeodesic,
      ellipsoid.maximumRadius,
      ellipsoid.minimumRadius,
      start.longitude,
      start.latitude,
      end.longitude,
      end.latitude
    );

    ellipsoidGeodesic._start = Matrix2.Cartographic.clone(
      start,
      ellipsoidGeodesic._start
    );
    ellipsoidGeodesic._end = Matrix2.Cartographic.clone(end, ellipsoidGeodesic._end);
    ellipsoidGeodesic._start.height = 0;
    ellipsoidGeodesic._end.height = 0;

    setConstants(ellipsoidGeodesic);
  }

  /**
   * Initializes a geodesic on the ellipsoid connecting the two provided planetodetic points.
   *
   * @alias EllipsoidGeodesic
   * @constructor
   *
   * @param {Cartographic} [start] The initial planetodetic point on the path.
   * @param {Cartographic} [end] The final planetodetic point on the path.
   * @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid on which the geodesic lies.
   */
  function EllipsoidGeodesic(start, end, ellipsoid) {
    const e = when.defaultValue(ellipsoid, Matrix2.Ellipsoid.WGS84);
    this._ellipsoid = e;
    this._start = new Matrix2.Cartographic();
    this._end = new Matrix2.Cartographic();

    this._constants = {};
    this._startHeading = undefined;
    this._endHeading = undefined;
    this._distance = undefined;
    this._uSquared = undefined;

    if (when.defined(start) && when.defined(end)) {
      computeProperties(this, start, end, e);
    }
  }

  Object.defineProperties(EllipsoidGeodesic.prototype, {
    /**
     * Gets the ellipsoid.
     * @memberof EllipsoidGeodesic.prototype
     * @type {Ellipsoid}
     * @readonly
     */
    ellipsoid: {
      get: function () {
        return this._ellipsoid;
      },
    },

    /**
     * Gets the surface distance between the start and end point
     * @memberof EllipsoidGeodesic.prototype
     * @type {Number}
     * @readonly
     */
    surfaceDistance: {
      get: function () {
        //>>includeStart('debug', pragmas.debug);
        RuntimeError.Check.defined("distance", this._distance);
        //>>includeEnd('debug');

        return this._distance;
      },
    },

    /**
     * Gets the initial planetodetic point on the path.
     * @memberof EllipsoidGeodesic.prototype
     * @type {Cartographic}
     * @readonly
     */
    start: {
      get: function () {
        return this._start;
      },
    },

    /**
     * Gets the final planetodetic point on the path.
     * @memberof EllipsoidGeodesic.prototype
     * @type {Cartographic}
     * @readonly
     */
    end: {
      get: function () {
        return this._end;
      },
    },

    /**
     * Gets the heading at the initial point.
     * @memberof EllipsoidGeodesic.prototype
     * @type {Number}
     * @readonly
     */
    startHeading: {
      get: function () {
        //>>includeStart('debug', pragmas.debug);
        RuntimeError.Check.defined("distance", this._distance);
        //>>includeEnd('debug');

        return this._startHeading;
      },
    },

    /**
     * Gets the heading at the final point.
     * @memberof EllipsoidGeodesic.prototype
     * @type {Number}
     * @readonly
     */
    endHeading: {
      get: function () {
        //>>includeStart('debug', pragmas.debug);
        RuntimeError.Check.defined("distance", this._distance);
        //>>includeEnd('debug');

        return this._endHeading;
      },
    },
  });

  /**
   * Sets the start and end points of the geodesic
   *
   * @param {Cartographic} start The initial planetodetic point on the path.
   * @param {Cartographic} end The final planetodetic point on the path.
   */
  EllipsoidGeodesic.prototype.setEndPoints = function (start, end) {
    //>>includeStart('debug', pragmas.debug);
    RuntimeError.Check.defined("start", start);
    RuntimeError.Check.defined("end", end);
    //>>includeEnd('debug');

    computeProperties(this, start, end, this._ellipsoid);
  };

  /**
   * Provides the location of a point at the indicated portion along the geodesic.
   *
   * @param {Number} fraction The portion of the distance between the initial and final points.
   * @param {Cartographic} [result] The object in which to store the result.
   * @returns {Cartographic} The location of the point along the geodesic.
   */
  EllipsoidGeodesic.prototype.interpolateUsingFraction = function (
    fraction,
    result
  ) {
    return this.interpolateUsingSurfaceDistance(
      this._distance * fraction,
      result
    );
  };

  /**
   * Provides the location of a point at the indicated distance along the geodesic.
   *
   * @param {Number} distance The distance from the inital point to the point of interest along the geodesic
   * @param {Cartographic} [result] The object in which to store the result.
   * @returns {Cartographic} The location of the point along the geodesic.
   *
   * @exception {DeveloperError} start and end must be set before calling function interpolateUsingSurfaceDistance
   */
  EllipsoidGeodesic.prototype.interpolateUsingSurfaceDistance = function (
    distance,
    result
  ) {
    //>>includeStart('debug', pragmas.debug);
    RuntimeError.Check.defined("distance", this._distance);
    //>>includeEnd('debug');

    const constants = this._constants;

    const s = constants.distanceRatio + distance / constants.b;

    const cosine2S = Math.cos(2.0 * s);
    const cosine4S = Math.cos(4.0 * s);
    const cosine6S = Math.cos(6.0 * s);
    const sine2S = Math.sin(2.0 * s);
    const sine4S = Math.sin(4.0 * s);
    const sine6S = Math.sin(6.0 * s);
    const sine8S = Math.sin(8.0 * s);

    const s2 = s * s;
    const s3 = s * s2;

    const u8Over256 = constants.u8Over256;
    const u2Over4 = constants.u2Over4;
    const u6Over64 = constants.u6Over64;
    const u4Over16 = constants.u4Over16;
    let sigma =
      (2.0 * s3 * u8Over256 * cosine2S) / 3.0 +
      s *
        (1.0 -
          u2Over4 +
          (7.0 * u4Over16) / 4.0 -
          (15.0 * u6Over64) / 4.0 +
          (579.0 * u8Over256) / 64.0 -
          (u4Over16 - (15.0 * u6Over64) / 4.0 + (187.0 * u8Over256) / 16.0) *
            cosine2S -
          ((5.0 * u6Over64) / 4.0 - (115.0 * u8Over256) / 16.0) * cosine4S -
          (29.0 * u8Over256 * cosine6S) / 16.0) +
      (u2Over4 / 2.0 -
        u4Over16 +
        (71.0 * u6Over64) / 32.0 -
        (85.0 * u8Over256) / 16.0) *
        sine2S +
      ((5.0 * u4Over16) / 16.0 -
        (5.0 * u6Over64) / 4.0 +
        (383.0 * u8Over256) / 96.0) *
        sine4S -
      s2 *
        ((u6Over64 - (11.0 * u8Over256) / 2.0) * sine2S +
          (5.0 * u8Over256 * sine4S) / 2.0) +
      ((29.0 * u6Over64) / 96.0 - (29.0 * u8Over256) / 16.0) * sine6S +
      (539.0 * u8Over256 * sine8S) / 1536.0;

    const theta = Math.asin(Math.sin(sigma) * constants.cosineAlpha);
    const latitude = Math.atan((constants.a / constants.b) * Math.tan(theta));

    // Redefine in terms of relative argument of latitude.
    sigma = sigma - constants.sigma;

    const cosineTwiceSigmaMidpoint = Math.cos(2.0 * constants.sigma + sigma);

    const sineSigma = Math.sin(sigma);
    const cosineSigma = Math.cos(sigma);

    const cc = constants.cosineU * cosineSigma;
    const ss = constants.sineU * sineSigma;

    const lambda = Math.atan2(
      sineSigma * constants.sineHeading,
      cc - ss * constants.cosineHeading
    );

    const l =
      lambda -
      computeDeltaLambda(
        constants.f,
        constants.sineAlpha,
        constants.cosineSquaredAlpha,
        sigma,
        sineSigma,
        cosineSigma,
        cosineTwiceSigmaMidpoint
      );

    if (when.defined(result)) {
      result.longitude = this._start.longitude + l;
      result.latitude = latitude;
      result.height = 0.0;
      return result;
    }

    return new Matrix2.Cartographic(this._start.longitude + l, latitude, 0.0);
  };

  exports.EllipsoidGeodesic = EllipsoidGeodesic;

}));
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