/*
 * @Author: hisense.wuhongjian
 * @Date: 2021-03-09 16:59:18
 * @LastEditors: hisense.wuhongjian
 * @LastEditTime: 2022-03-14 16:37:49
 * @Description: 坐标系转换通用方法 提供百度坐标(BD-09)、国测局坐标(火星坐标，GCJ-02)和WGS84坐标系之间的转换
 */

/** ******************************************************变量区*********************************************************/

const xPI = (3.14159265358979324 * 3000.0) / 180.0
const PI = 3.1415926535897932384626
const a = 6378245.0
const ee = 0.00669342162296594323

// let EARTHRADIUS = 6370996.81
const MCBAND = [12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0]
const LLBAND = [75, 60, 45, 30, 15, 0]

const MC2LL = [
  [
    1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331,
    200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339,
    2.57121317296198, -0.03801003308653, 17337981.2,
  ],
  [
    -7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289,
    96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737,
    -16.50741931063887, 2.28786674699375, 10260144.86,
  ],
  [
    -3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616,
    59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908,
    -3.29883767235584, 0.32710905363475, 6856817.37,
  ],
  [
    -1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591,
    40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263,
    0.12923347998204, -0.04625736007561, 4482777.06,
  ],
  [
    3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062,
    23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273,
    0.03430082397953, -0.00466043876332, 2555164.4,
  ],
  [
    2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8,
    7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596,
    0.00010322952773, -0.00000323890364, 826088.5,
  ],
]

const LL2MC = [
  [
    -0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340,
    26112667856603880, -35149669176653700, 26595700718403920,
    -10725012454188240, 1800819912950474, 82.5,
  ],
  [
    0.0008277824516172526, 111320.7020463578, 647795574.6671607,
    -4082003173.641316, 10774905663.51142, -15171875531.51559,
    12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5,
  ],
  [
    0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662,
    79682215.47186455, -115964993.2797253, 97236711.15602145,
    -43661946.33752821, 8477230.501135234, 52.5,
  ],
  [
    0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245,
    992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312,
    144416.9293806241, 37.5,
  ],
  [
    -0.0003441963504368392, 111320.7020576856, 278.2353980772752,
    2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236,
    -2710.55326746645, 1405.483844121726, 22.5,
  ],
  [
    -0.0003218135878613132, 111320.7020701615, 0.00369383431289,
    823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199,
    8.77738589078284, 0.37238884252424, 7.45,
  ],
]

/** ******************************************************方法区*********************************************************/

/**
 * @method bd09togcj02 百度坐标系(BD-09)转火星坐标系(GCJ-02)即百度地图 转成 谷歌地图、高德地图
 * @param bdLon 百度坐标系下的经度
 * @param bdLat 百度坐标系下的纬度
 * @return [gcjLon,gcjLat] 火星坐标系下的经纬度坐标
 */
function bdLL2gcjLL(bdLon, bdLat) {
  const lon = +bdLon
  const lat = +bdLat

  const x = lon - 0.0065
  const y = lat - 0.006
  const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xPI)

  const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xPI)
  const gcjLon = z * Math.cos(theta)
  const gcjLat = z * Math.sin(theta)

  return [gcjLon, gcjLat]
}

/**
 * @method gcj02_to_bd09 火星坐标系(GCJ-02)转百度坐标系(BD-09) 即谷歌地图、高德地图 转成 百度地图
 * @param gcjLon 火星坐标系下的经度
 * @param gcjLat 火星坐标系下的纬度
 * @returns [bdLon,bdLat] 百度坐标系下的经纬度坐标
 */
function gcjLL2bdLL(gcjLon, gcjLat) {
  const lon = +gcjLon
  const lat = +gcjLat

  const z = Math.sqrt(lon * lon + lat * lat) + 0.00002 * Math.sin(lat * xPI)

  const theta = Math.atan2(lat, lon) + 0.000003 * Math.cos(lon * xPI)
  const bdLon = z * Math.cos(theta) + 0.0065
  const bdLat = z * Math.sin(theta) + 0.006

  return [bdLon, bdLat]
}

/**
 * @method wgs84_to_gcj02 WGS84坐标系转火星坐标系(GCJ-02)
 * @param wgsLon WGS84坐标系下的经度坐标
 * @param wgsLat WGS84坐标系下的纬度坐标
 * @returns [mglon,mglat] 转换后火星坐标系下的经纬度坐标
 */
function wgs84LL2gcjLL(wgsLon, wgsLat) {
  const lon = +wgsLon
  const lat = +wgsLat

  // 如果坐标不在国内范围，则直接返回，不做偏移处理
  if (out_of_china(lon, lat)) {
    return [lon, lat]
  } else {
    let dlat = transform_lat(lon - 105.0, lat - 35.0)
    let dlon = transform_lon(lon - 105.0, lat - 35.0)

    const radlat = (lat / 180.0) * PI
    let magic = Math.sin(radlat)
    magic = 1 - ee * magic * magic
    const sqrtmagic = Math.sqrt(magic)

    dlat = (dlat * 180.0) / (((a * (1 - ee)) / (magic * sqrtmagic)) * PI)
    dlon = (dlon * 180.0) / ((a / sqrtmagic) * Math.cos(radlat) * PI)

    const mglat = lat + dlat
    const mglon = lon + dlon

    return [mglon, mglat]
  }
}

/**
 * @method gcj02_to_wgs84 火星坐标系(GCJ-02)转WGS84坐标系
 * @param gcjLon 火星坐标系下的经度坐标
 * @param gcjLat 火星坐标系下的纬度坐标
 * @returns [] 转换后WGS84坐标系下的经纬度坐标
 */
export function gcjLL2wgs84LL(gcjLon, gcjLat) {
  const lon = +gcjLon
  const lat = +gcjLat

  if (out_of_china(lon, lat)) {
    return [lon, lat]
  } else {
    let dlat = transform_lat(lon - 105.0, lat - 35.0)
    let dlon = transform_lon(lon - 105.0, lat - 35.0)

    const radlat = (lat / 180.0) * PI
    let magic = Math.sin(radlat)
    magic = 1 - ee * magic * magic
    const sqrtmagic = Math.sqrt(magic)

    dlat = (dlat * 180.0) / (((a * (1 - ee)) / (magic * sqrtmagic)) * PI)
    dlon = (dlon * 180.0) / ((a / sqrtmagic) * Math.cos(radlat) * PI)

    const mglat = lat + dlat
    const mglon = lon + dlon

    return [lon * 2 - mglon, lat * 2 - mglat]
  }
}

/**
 * @method lonlat_to_webMercator_of_WGS84 经纬度坐标转墨卡托投影(WGS84)
 * @param lon 待转换的经度坐标
 * @param lat 待转换的纬度坐标
 * @returns [x,y] 转换后的平面投影坐标
 */
function LL2ME_wgs84(lon, lat) {
  // [114.32894, 30.585748]
  const earthRad = 6378137.0
  const x = ((lon * Math.PI) / 180) * earthRad

  const a = (lat * Math.PI) / 180
  const y = (earthRad / 2) * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)))

  return [x, y] // [12727039.383734727, 3579066.6894065146]
}

/**
 * @method webMercator_to_lonlat_of_WGS84 墨卡托投影转经纬度坐标(WGS84)
 * @param x 待转换的平面投影经度坐标
 * @param y 待转换的平面投影纬度坐标
 * @returns [lon,lat] 转换后的经纬度坐标
 */
function ME2LL_wgs84(x, y) {
  // [12727039.383734727, 3579066.6894065146]
  const lon = (x / 20037508.34) * 180
  let lat = (y / 20037508.34) * 180

  lat =
    (180 / Math.PI) *
    (2 * Math.atan(Math.exp((lat * Math.PI) / 180)) - Math.PI / 2)

  return [lon, lat] // [114.32894001591471, 30.58574800385281]
}

/**
 * @method wgs84_to_bd09 WGS84坐标系转百度坐标系(BD-09)
 * @param wgsLon WGS84坐标系下的经度坐标
 * @param wgsLat WGS84坐标系下的纬度坐标
 * @returns bd_coordinate 转换后百度坐标系下的经纬度坐标
 */
export function wgs84LL2bdLL(wgsLon, wgsLat) {
  const gcjCoordinate = wgs84LL2gcjLL(wgsLon, wgsLat) // WGS84坐标系 转 火星坐标系
  const bdCoordinate = gcjLL2bdLL(gcjCoordinate[0], gcjCoordinate[1]) // 火星坐标系 转 百度坐标系

  return bdCoordinate
}

/**
 * @method bd09_to_wgs84 百度坐标系(BD-09)转WGS84坐标系
 * @param bdLon 百度坐标系下的经度坐标
 * @param bdLat 百度坐标系下的纬度坐标
 * @returns wgs_coordinate 转换后WGS84坐标系下的经纬度坐标
 */
export function bdLL2wgs84LL(bdLon, bdLat) {
  const gcjCoordinate = bdLL2gcjLL(bdLon, bdLat) // 百度坐标系 转 火星坐标系
  const wgsCoordinate = gcjLL2wgs84LL(gcjCoordinate[0], gcjCoordinate[1]) // 火星坐标西 转 WGS84坐标系

  return wgsCoordinate
}

/**
 * @method webMercator_to_lonlat_of_bd09 墨卡托投影转经纬度坐标(bd09)
 * @param x 待转换的墨卡托投影平面经度坐标
 * @param y 待转换的墨卡托投影平面纬度坐标
 * @returns location 转换后百度坐标系下的经纬度坐标
 */
function ME2LL_bd09(x, y) {
  let cF = null
  x = Math.abs(x)
  y = Math.abs(y)
  for (let cE = 0; cE < MCBAND.length; cE++) {
    if (y >= MCBAND[cE]) {
      cF = MC2LL[cE]
      break
    }
  }
  if (cF !== null) {
    const location = converter(x, y, cF)
    return location
  }
}

/**
 * @method lonlat_to_webMercator_of_bd09 经纬度坐标转墨卡托投影(bd09)
 * @param lon 待转换的百度坐标系下的经度坐标
 * @param lat 待转换的百度坐标系下的纬度坐标
 * @returns [] 转换后墨卡托投影平面经纬度坐标
 */
function LL2ME_bd09(lon, lat) {
  let cE = ''
  lon = getLoop(lon, -180, 180)
  lat = getRange(lat, -74, 74)

  for (let i = 0; i < LLBAND.length; i++) {
    if (lat >= LLBAND[i]) {
      cE = LL2MC[i]
      break
    }
  }

  if (!cE) {
    for (let i = LLBAND.length - 1; i >= 0; i--) {
      if (lat <= -LLBAND[i]) {
        cE = LL2MC[i]
        break
      }
    }
  }

  return converter(lon, lat, cE)
}

/**
 * @method lonlat_of_wgs84_to_webMercator_of_bd09 WGS84坐标系转百度墨卡托
 * @param lon 待转换的WGS84坐标系下的经度坐标
 * @param lat 待转换的WGS84坐标系下的纬度坐标
 * @returns [] 转换后百度坐标系下的墨卡托投影平面坐标
 */
export function wgs84LL2bdME(lon, lat) {
  const bd = wgs84LL2bdLL(lon, lat)
  return LL2ME_bd09(bd[0], bd[1])
}

/**
 * @method webMercator_of_bd09_to_lonlat_of_wgs84 百度墨卡托转WGS84坐标系
 * @param x 待转换的百度坐标系下墨卡托投影平面经度坐标
 * @param y 待转换的百度坐标系下墨卡托投影平面纬度坐标
 * @returns [] 转换后WGS84坐标系下的经纬度坐标
 */
function bdME2wgs84LL(x, y) {
  if (!isNaN(x) && !isNaN(y)) {
    const bd = ME2LL_bd09(x, y)
    return bdLL2wgs84LL(bd[0], bd[1])
  } else {
    return [0, 0]
  }
}

/**
 * @method 判断经纬度坐标是否在国内，如果不在国内返回true，否则返回false
 * @param longitude 经度坐标
 * @param latitude 纬度坐标
 * @returns {boolean} 如果不在国内返回true,在国内返回false
 */
function out_of_china(longitude, latitude) {
  const lon = +longitude
  const lat = +latitude

  // 纬度3.86~53.55,经度73.66~135.05
  return !(lon > 73.66 && lon < 135.05 && lat > 3.86 && lat < 53.55)
}

/**
 * @method transform_lat 转换纬度坐标
 * @param longitude 待转换的经度坐标
 * @param latitude 待转换的纬度坐标
 * @returns {number} 返回转换后的纬度坐标
 */
function transform_lat(longitude, latitude) {
  const lon = +longitude
  const lat = +latitude

  let ret =
    -100.0 +
    2.0 * lon +
    3.0 * lat +
    0.2 * lat * lat +
    0.1 * lon * lat +
    0.2 * Math.sqrt(Math.abs(lon))
  ret +=
    ((20.0 * Math.sin(6.0 * lon * PI) + 20.0 * Math.sin(2.0 * lon * PI)) *
      2.0) /
    3.0
  ret +=
    ((20.0 * Math.sin(lat * PI) + 40.0 * Math.sin((lat / 3.0) * PI)) * 2.0) /
    3.0
  ret +=
    ((160.0 * Math.sin((lat / 12.0) * PI) + 320 * Math.sin((lat * PI) / 30.0)) *
      2.0) /
    3.0

  return ret
}

/**
 * @method transform_lon 转换经度坐标
 * @param longitude 待转换的经度坐标
 * @param latitude 待转换的纬度坐标
 * @returns {number} 返回转换后的经度坐标
 */
function transform_lon(longitude, latitude) {
  const lon = +longitude
  const lat = +latitude

  let ret =
    300.0 +
    lon +
    2.0 * lat +
    0.1 * lon * lon +
    0.1 * lon * lat +
    0.1 * Math.sqrt(Math.abs(lon))
  ret +=
    ((20.0 * Math.sin(6.0 * lon * PI) + 20.0 * Math.sin(2.0 * lon * PI)) *
      2.0) /
    3.0
  ret +=
    ((20.0 * Math.sin(lon * PI) + 40.0 * Math.sin((lon / 3.0) * PI)) * 2.0) /
    3.0
  ret +=
    ((150.0 * Math.sin((lon / 12.0) * PI) +
      300.0 * Math.sin((lon / 30.0) * PI)) *
      2.0) /
    3.0

  return ret
}

/**
 * @method converter 墨卡托投影转百度坐标系经纬度坐标
 * @param x 墨卡托投影平面经度坐标
 * @param y 墨卡托投影平面纬度坐标
 * @param cE 转换系数数组
 * @returns [] 转换结果
 */
function converter(x, y, cE) {
  let xTemp = cE[0] + cE[1] * Math.abs(x)
  const cC = Math.abs(y) / cE[9]
  let yTemp =
    cE[2] +
    cE[3] * cC +
    cE[4] * cC * cC +
    cE[5] * cC * cC * cC +
    cE[6] * cC * cC * cC * cC +
    cE[7] * cC * cC * cC * cC * cC +
    cE[8] * cC * cC * cC * cC * cC * cC
  xTemp *= x < 0 ? -1 : 1
  yTemp *= y < 0 ? -1 : 1

  return [xTemp, yTemp]
}

/**
 * @method getLoop
 * @param lng
 * @param min
 * @param max
 * @returns {*}
 */
function getLoop(lng, min, max) {
  while (lng > max) {
    lng -= max - min
  }
  while (lng < min) {
    lng += max - min
  }
  return lng
}

/**
 * @method getRange
 * @param lat
 * @param min
 * @param max
 * @returns {*}
 */
function getRange(lat, min, max) {
  if (min != null) {
    lat = Math.max(lat, min)
  }
  if (max != null) {
    lat = Math.min(lat, max)
  }
  return lat
}


export function wgs84LL2gcjLL2(wgsLon, wgsLat) {
  const lon = +wgsLon
  const lat = +wgsLat

  // 如果坐标不在国内范围，则直接返回，不做偏移处理
  if (out_of_china(lon, lat)) {
    return [lon, lat]
  } else {
    let dlat = transform_lat(lon - 105.0, lat - 35.0)
    let dlon = transform_lon(lon - 105.0, lat - 35.0)

    const radlat = (lat / 180.0) * PI
    let magic = Math.sin(radlat)
    magic = 1 - ee * magic * magic
    const sqrtmagic = Math.sqrt(magic)

    dlat = (dlat * 180.0) / (((a * (1 - ee)) / (magic * sqrtmagic)) * PI)
    dlon = (dlon * 180.0) / ((a / sqrtmagic) * Math.cos(radlat) * PI)

    const mglat = lat + dlat
    const mglon = lon + dlon

    return [mglon, mglat]
  }
}