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) => {
  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(cPath)
        }
      })
    }) || [])
  })
}
/**
 * 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))
  }))
}
/**
 * 生成对应的main入口js文件
 */
const generateMain = project => {
  let cores, apps
  const getCores = new Promise(resolve => {
    let install = path.join(__dirname, project, 'index.js')
    fsExtra.ensureFile(install)
    const coreLib = path.join(__dirname, project, 'core.import.json')
    fsExtra.readJson(coreLib, (err, data) => {
      chalkTag.info(project + "加载核心库配置..")
      cores = []
      if (data) {
        findApp('core/apps', file => {
          let fileName = file.replace(/.*[\\\/](.+)\.vue/g, '$1')
          if (Object.keys(data).includes(fileName)) {
            cores.push({name: fileName, component: file.replace(/\\/g, "/")})
          }
        }).then(() => {
          chalkTag.done(project + '核心库打包完毕')
          resolve()
        })
      } else {
        chalkTag.done(project + '核心库无打包')
        resolve()
      }
    })
  })
  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...')
      apps = []
      let appDir = "packages"
      if (data) {
        findApp(appDir, file => {
          let fileName = file.replace(/.*[\\\/](.+)\.vue/g, '$1')
          if (Object.keys(data).includes(fileName)) {
            apps.push({name: fileName, component: file.replace(/\\/g, "/")})
          }
        }).then(() => {
          chalkTag.done(project + '业务应用打包完毕')
          resolve()
        })
      } else {
        chalkTag.done(project + '业务应用无打包')
        resolve()
      }
    })
  })
  return Promise.all([getCores, getApps]).then(() => new Promise(resolve => {
    if (project == 'dvui') {
      return resolve()
    }
    chalkTag.info(project + '正在生成打包文件...')
    let bin = path.join(__dirname, project.toString(), 'index.js'),
        coreApps = cores.map(e => `{name:'${e.name}',component:require('../../${e.component}').default}`),
        bizApps = apps.map(e => `{name:'${e.name}',component:require('../../${e.component}').default}`),
        comps = [...coreApps, ...bizApps],
        content = `
        const apps = [${comps.toString()}]
        const install = function (Vue) {
          if (install.installed) return Promise.resolve()
          else{
            let contexts = require.context('.', true, /(\\/.+)[\\\/]App[^\\\/]+\\.vue$/)
            if (contexts) {
              contexts.keys().map(e => {
                if (contexts(e).default) {
                  let mod = apps.find(a=>a.name==contexts(e).default.name)
                  if(mod){
                    mod.component = contexts(e).default
                  }else{
                    apps.push({name:contexts(e).default.name,component:contexts(e).default})
                  }
                }
              })
            }
            apps.map(e=>{
               Vue.component(e.name,e.component)
            })
          }
        }
       // 判断是否是直接引入文件
        if (typeof window !== 'undefined' && window.Vue) {
          install(window.Vue)
        }
        export default {
            // 导出的对象必须具有 install，才能被 Vue.use() 方法安装
            install
         }
        `
    fsExtra.outputFile(bin, content, err => {
      if (err) chalkTag.error(err)
      else chalkTag.done(project + '生成打包文件')
      resolve()
    })
  })).then(() => {
    fsExtra.readJson(path.join(__dirname, project.toString(), 'package.json'), (err, json) => {
      let cmd = `vue-cli-service build --target lib --dest project/${project}/dist project/${project}/${project == 'dvui' ? 'entries' : 'index'}.js --name ${json.name}`
      chalkTag.info(project + '正在压缩文件中...')
      exec(cmd, {
        cwd: path.join(__dirname, '..')
      }, (err) => {
        if (!err) {
          chalkTag.done(project + '打包成功!')
        } else {
          chalkTag.error(err)
        }
      })
    })
  })
}
const start = () => {
  //询问打包哪个项目
  init().then(choices => {
    return Promise.all(choices.map(prj => generateMain(prj))).then(() => {
      chalkTag.done('完成生成打包文件')
    })
  })
}
start();