import * as fs from 'fs';
import * as path from 'path';

export function getFileContentByName(fileName: string) {
  if (fs.existsSync(fileName)) {
    return fs.readFileSync(fileName, 'utf8');
  }
  return '';
}

export function getLastModifyFilePath(dir: string) {
  let filePath = '';

  if (fs.existsSync(dir)) {
    const arr = fs.readdirSync(dir);

    arr.forEach((item) => {
      const fullpath = path.join(dir, item);
      const stats = fs.statSync(fullpath);
      if (stats.isFile()) {
        if (stats.mtimeMs >= 0) {
          filePath = fullpath;
        }
      }
    });
  }
  return filePath;
}

export function createRandomString(min: number, max: number): string {
  const num = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
  const english = [
    'a',
    'b',
    'c',
    'd',
    'e',
    'f',
    'g',
    'h',
    'i',
    'j',
    'k',
    'l',
    'm',
    'n',
    'o',
    'p',
    'q',
    'r',
    's',
    't',
    'u',
    'v',
    'w',
    'x',
    'y',
    'z',
  ];
  const ENGLISH = [
    'A',
    'B',
    'C',
    'D',
    'E',
    'F',
    'G',
    'H',
    'I',
    'J',
    'K',
    'L',
    'M',
    'N',
    'O',
    'P',
    'Q',
    'R',
    'S',
    'T',
    'U',
    'V',
    'W',
    'X',
    'Y',
    'Z',
  ];
  const special = ['-', '_', '#'];
  const config = num.concat(english).concat(ENGLISH).concat(special);

  const arr = [];
  arr.push(getOne(num));
  arr.push(getOne(english));
  arr.push(getOne(ENGLISH));
  arr.push(getOne(special));

  const len = min + Math.floor(Math.random() * (max - min + 1));

  for (let i = 4; i < len; i++) {
    arr.push(config[Math.floor(Math.random() * config.length)]);
  }

  const newArr = [];
  for (let j = 0; j < len; j++) {
    newArr.push(arr.splice(Math.random() * arr.length, 1)[0]);
  }

  function getOne(arr) {
    return arr[Math.floor(Math.random() * arr.length)];
  }

  return newArr.join('');
}

export function getToken(req: any) {
  const { authorization } = req.headers;
  if (authorization && authorization.split(' ')[0] === 'Bearer') {
    return authorization.split(' ')[1];
  }
  return '';
}