const fsExtra = require('fs-extra')
const path = require('path')
const chalk = require('chalk')
const fs = require('fs')
const {exec} = require("child_process");
/**
 * 将函数封装成promise
 */
const promisify = fn => {
  return function () {
    let args = arguments;
    return new Promise(function (resolve, reject) {
      [].push.call(args, function (err, result) {
        if (err) {
          console.log(err)
          reject(err);
        } else {
          resolve(result);
        }
      });
      fn.apply(null, args);
    });
  }
}

const readdir = promisify(fs.readdir)
const stat = promisify(fs.stat)

/**
 * 封装打印工具
 */
const {log} = console
const chalkTag = {
  info: msg => log([chalk.bgBlue.black(' INFO '), msg].join(' ')),
  done: msg => log([chalk.bgGreen.black(' DONE '), msg].join(' ')),
  warn: msg => log([chalk.bgYellow.black(' WARN '), msg].join(' ')),
  error: msg => log([chalk.bgRed.black(' ERROR '), msg].join(' ')),
}

/**
 * 遍历应用的方法
 */
const findApp = (dir, cb) => {
  fsExtra.ensureDirSync(dir)
  return readdir(dir).then(apps => {
    return Promise.all(apps.map(e => {
      let cPath = path.join(dir, e)
      return stat(cPath).then(state => {
        if (state.isDirectory()) {
          return findApp(cPath, cb)
        } else if (state.isFile()) {
          cb && cb(dir)
        }
      })
    }) || [])
  })
}

/**
 * 迁移apps文件
 */
const copyFiles = (dir, source = 'src/mods') => {
  chalkTag.info(`开始扫描${source}...`)
  return new Promise(resolve => {
    fsExtra.emptyDir(dir, err => {
      if (!err) {
        fsExtra.copy(source, dir).then(() => {
          chalkTag.done(source + ' 扫描完毕')
          resolve()
        })
      }
    })
  })
}
/**
 * 初始化打包配置文件
 */
const init = () => {
  chalkTag.info('开始运行项目打包工具...')
  return new Promise(resolve => fs.readdir('./project', (err, files) => {
    resolve(files.filter(e => e.indexOf('.') < 0))
  }))
}
/**
 * 拷贝对应文件
 */
const generateMain = project => {
  const getApps = new Promise(resolve => {
    const appLib = path.join(__dirname, project.toString(), 'apps.import.json')
    fsExtra.readJson(appLib, (err, data) => {
      chalkTag.info(project + '加载业务应用配置...')
      let apps = []
      if (data) {
        fsExtra.emptyDirSync(`project/${project}/apps`)
        findApp('src/mods', file => {
          apps.push(file)
        }).then(() => {
          Promise.all(Object.keys(data).map(e => {
            let app = [...new Set(apps)].find(s => s.indexOf(e) > -1)
            if (app) {
              return copyFiles(`project/${project}/apps/${e}`, app)
            }
          })).then(() => {
            chalkTag.done(project + '业务应用加载完成')
            resolve()
          })
        })
      } else {
        chalkTag.done(project + '业务应用无打包')
        resolve()
      }
    })
  })
  return Promise.all([getApps])
}
const start = () => {
  //询问打包哪个项目
  init().then(choices => {
    return Promise.all(choices.map(prj => generateMain(prj))).then(() => {
      chalkTag.info('开始发布...')
    })
  })
}
start();