const XLSX = require('xlsx');

const fs = require('fs');
// 读取xlsx文件
const workbook = XLSX.readFile('./test.xlsx');

// 读取特定的worksheet，默认第一个worksheet
const worksheet = workbook.Sheets['Sheet2'];

// 将worksheet转换为JSON对象
const jsonData = XLSX.utils.sheet_to_json(worksheet);
function dmsToDecimal(degrees, minutes, seconds) {
  return degrees + minutes / 60 + seconds / 3600;
}


const results = []

for (const jsonDatum of jsonData) {
  const location = jsonDatum['经纬度']
  const [lat, lon] = location.split(' ')
  let latStr = lat.replace(/\°|\'|["(N|E)]/g, '@')
  let lonStr = lon.replace(/\°|\'|["(N|E)]/g, '@')
  const [latDegrees, latMinutes, latSeconds] = latStr.split('@')
  const [longDegrees, longMinutes, longSeconds] = lonStr.split('@')
  const latitude = dmsToDecimal(parseInt(latDegrees), parseInt(latMinutes), parseInt(latSeconds));
  const longitude = dmsToDecimal(parseInt(longDegrees), parseInt(longMinutes),parseInt( longSeconds));
  results.push( {
    longitude,
    latitude
  })
}


// 文件内容
const content = JSON.stringify(results, null, 2)

// 文件路径
const filePath = './output.json';

// 写入文件
fs.writeFile(filePath, content, 'utf8', function(err) {
  if (err) {
    return console.log(err);
  }
  console.log('文件已保存');
});