// degree -> radian 변환
const deg2rad = deg => {
  return deg * (Math.PI / 180);
};
const rad2deg = rad => {
  return rad * (180 / Math.PI);
};
// 좌표간 거리계산
const getDistanceFromCoordByMeter = (coord1, coord2) => {
  const R = 6371; // Radius of the earth in km
  const dLat = deg2rad(coord2[0] - coord1[0]); // deg2rad below
  const dLon = deg2rad(coord2[1] - coord1[1]);
  const a =
    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
    Math.cos(deg2rad(coord1[0])) *
      Math.cos(deg2rad(coord2[0])) *
      Math.sin(dLon / 2) *
      Math.sin(dLon / 2);
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  // var d = R * c; // Distance in km
  const d = R * c * 1000; // Distance in m
  return d;
};
// 두 좌표사이 특정 거리만큼의 좌표 추출
const getCoordsFormBetweenCoord = (coord1, coord2, dist) => {
  // console.log('init ===> ', {coord1, coord2, dist})
  const r = [];
  // 처음 좌표
  r.push(coord1);
  // 중간 좌표
  const totalDist = getDistanceFromCoordByMeter(coord1, coord2);
  const dx = coord2[0] - coord1[0];
  const singX = dx < 0 ? -1 : 1;
  const dy = coord2[1] - coord1[1];
  const singY = dy < 0 ? -1 : 1;
  const m = dy / dx;
  const rad = Math.atan(m);

  const currentTotalDist = Math.sqrt(dx ** 2 + dy ** 2);
  const currentDivDist = (dist * currentTotalDist) / totalDist;
  const div = Math.floor(currentTotalDist / currentDivDist);

  for (let i = 1; i <= div; i++) {
    const currentDist = currentDivDist * i;
    let x = coord1[0];
    let y = coord1[1];
    if (dx === 0) {
      y += currentDist * singY;
    } else if (dy === 0) {
      x += currentDist * singX;
    } else {
      const angle = Math.atan2(dy, dx);
      x += Math.cos(angle) * currentDist;
      y += Math.sin(angle) * currentDist;
    }
    r.push([x, y]);
  }
  // 마지막 좌표
  r.push(coord2);
  return r;
};

const dumyData = {
  authKey: '1cc2e08e-0c5c-43b2-8d4d-cddd3de558e3',
  terminalId: 'SANDBOX-01',
  command: 'SANDBOX',
  body: [
    {
      objectId: 'JAL497',
      lat: 37.52097,
      lon: 126.6146,
      elevType: 'M',
      elev: 125.4,
      speedType: 'KM',
      speed: 145.8,
      heading: 227.94,
      terminalRcvDt: '20210629173145',
      betteryLevel: 91,
      betteryVoltage: 50,
      dronStatus: 'TAKEOFF',
      moveDistance: 120,
      moveDistanceType: 'M',
      sensorCo: 100.11,
      sensorSo2: 200.22,
      sensorNo2: 300.33,
      sensorO3: 400.44,
      sensorDust: 500.55
    }
  ]
};

module.exports = {
  getDistanceFromCoordByMeter,
  deg2rad,
  getCoordsFormBetweenCoord,
  dumyData
};

const test = () => {
  const coord1 = [37.521, 126.6082];
  // const coord2 = [37.5210, 126.6057]; // x 절편
  const coord2 = [37.52, 126.6082]; // y 절편
  // const coord2 = [37.5220, 126.6057]; // 일반
  const r = getCoordsFormBetweenCoord(coord1, coord2, 10);
  console.log(r);
  for (let i = 1; i < r.length; i++) {
    const dist = getDistanceFromCoordByMeter(r[i - 1], r[i]);
    console.log(dist);
  }
};

// test();

const test2 = () => {
  let m = 10.5 / 14;
  console.log(3 / 4, 13.5 / 18, (13.5 - 3) / (18 - 4));
  let rad = Math.atan(m);
  let tan = Math.tan(rad);
  let cos = Math.cos(rad);
  let sin = Math.sin(rad);
  console.log({ rad, tan, cos, sin });
  let x = Math.cos(rad) * 15;
  let y = Math.sin(rad) * 15;
  console.log({ x, y });
};
// test2();