'use strict'

let fs = require('fs');
let args = process.argv;
let dist = 'dist';
let src = 'src';
let index = 0;
let ignore = '';

// 目標路徑
dist = args[2];
// 名字前綴
src = args[3];
// 遞增后綴
index = args[4] || 1;
// ? 忽略的文件
ignore = args[5] || "";

let files = fs.readdirSync(dist);
let sortValue = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
files.sort(function (a, b) {
    let index = -1;
    for (let i = sortValue.length - 1; i >= 0; i--) {
        index = a.indexOf(sortValue[i]);
        if (index != -1) {
            // console.log("a: ", a, " i: ", i, " index: ", index);
            break;
        }
    }

    if (index == -1) {
        return 0;
    }
    else {
        let aid = parseInt(a.substring(index));
        let bid = parseInt(b.substring(index));
        if (aid == NaN || bid == NaN) {
            return 0;
        }
        else {
            return aid - bid;
        }
    }
});

for (let i = 0; i < files.length; i++) {
    if (ignore !== "" && files[i].indexOf(ignore) === -1) {
        continue;
    }
    let stat = fs.statSync(dist + "\\" + files[i]);
    let runRename = function (stat) {
        if (stat.isFile()) {
            let prefix = dist + "\\";
            let suffix = files[i].substring(files[i].indexOf("."));
            let oldName = prefix + files[i];
            let newName = prefix + src + index + suffix;
            fs.renameSync(oldName, newName);
            index++;
        }
    };
    runRename(stat);
}

// 引入 fs 文件系統(tǒng)模塊
let fs = require('fs')

const dirName = 'mus' // 讀取目標文件夾名稱
const reg = /(?<=[.])[a-z]+/ // 文件后綴 匹配規(guī)則

// 讀文件夾，獲取文件名列表
let fileList = fs.readdirSync(dirName)

// 過濾出想要的文件類型
let resultList = fileList.reduce((pev, cur) => {
  // 獲取后綴
  const curPicType = cur.match(reg)[0]
  if (['mgg', 'flac', 'ogg', 'lrc'].includes(curPicType)) {
    pev.push(cur)
  }
  return pev
}, [])
console.log('文件列表', resultList)

// 循環(huán)當前文件名列表，根據(jù)需要重寫名字
for (let i = 0; i < resultList.length; i++) {
  // 文件完整名稱
  const curFileName = resultList[i]
  // 后綴名
  const fileFormat = curFileName.match(reg)[0]
  // 去掉后綴的文件名
  const fileCode = curFileName.split('.')[0]


  // oldPath 原地址
  const oldPath = `./${dirName}/${curFileName}`
  // newPath 目標地址
  let newPath = ''

  // 修改方式
  // 如果想根據(jù)不同條件，將文件分別放到不同的文件夾，按需更改 newPath 即可
  if (fileFormat == 'ogg' || fileFormat == 'mgg') {
    newPath = `./${dirName}/${fileCode}.mp3`
  } else {
    newPath = oldPath
  }

  // 確認修改
  fs.rename(oldPath, newPath, (err) => {
    if (err) throw err;
    console.log(`修改成功 -- ${newPath}`);
  })
}