'use strict';
const { CrudService } = require('naf-framework-mongoose-free/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;
const _ = require('lodash');
const assert = require('assert');
const os = require('os');
const { execSync } = require('child_process');
//
class UtilService extends CrudService {
  constructor(ctx) {
    super(ctx, 'util');
  }
  async getDrives() {
    let lines;
    const osType = os.platform().toLowerCase();
    if (osType === 'win32') {
      const cmd = 'wmic logicaldisk get Caption,FreeSpace,Size,VolumeSerialNumber,Description  /format:list';
      const cmdRes = execSync(cmd, { encoding: 'utf8' });
      lines = cmdRes.split('\r\r\n');
    } else {
      const cmd = "df -P | awk 'NR > 1'";
      const cmdRes = execSync(cmd, { encoding: 'utf8' });
      lines = cmdRes.split('\n');
    }
    const data = this.changeToArray(lines);
    return data;
  }
  /**
   * 整理数据
   * @param {Array} lines 除去换行后的数组
   */
  changeToArray(lines) {
    const returnArry = [];
    lines = lines.filter(f => f !== '');
    lines = _.chunk(lines, 5);
    for (const line of lines) {
      const obj = {};
      for (const str of line) {
        const arr = str.split('=');
        const tag = _.head(arr);
        const value = _.last(arr);
        if (tag === 'Caption') obj.mounted = value;
        else if (tag === 'FreeSpace') obj.available = parseFloat(value);
        else if (tag === 'Size') obj.blocks = parseFloat(value);
        else continue;
      }
      if (obj.blocks && obj.available) {
        obj.used = obj.blocks - obj.available;
        obj.capacity = Math.round((parseFloat(obj.used) / parseFloat(obj.blocks)) * 100) + '%';
      }
      returnArry.push(obj);
    }
    return returnArry;
  }
}

module.exports = UtilService;