const { app, BrowserWindow, Menu, ipcMain, globalShortcut, dialog, shell } = require('electron');
const path = require('path')
const { createWriteStream, existsSync } = require('fs');
const request = require('request');

let win, loadingWin;
Menu.setApplicationMenu(null) // 去掉菜单栏
app.commandLine.appendSwitch('wm-window-animations-disabled') // 拖动闪屏


/** 打开下载选择路径 */
async function openFileDialog(oldPath = app.getPath('downloads')) {
  if (oldPath) return oldPath
  const { canceled, filePaths } = await dialog.showOpenDialog(this.win, { title: '选择保存位置', properties: ['openDirectory', 'createDirectory'], defaultPath: oldPath, })
  return !canceled ? filePaths[0] : oldPath
}

/**
 * 下载
 * @param url 下载地址
 */
async function downloadFile(url) {
  const filePath = await this.openFileDialog()
  // FN2
  // this.win.webContents.downloadURL(url);
  // this.win.webContents.session.once('will-download', async (event, item, webContents) => {
  //   const path = await this.openFileDialog()
  //   const filePath = path.join(path,`${filename}`)
  // })

  // FN1
  const res = await new Promise((res, rej) => {
    const stream = request(url).pipe(createWriteStream(filePath))
    stream.on('finish', res(true))
    stream.on('error', rej(false))
  })
  dialog.showMessageBox(this.win, { message: res ? '下载成功' : '下载失败' })
}

/** 打开文件夹 */
function openFileInFolder(path) {
  if (!existsSync(path)) return false
  shell.showItemInFolder(path)
  return true
}

// 创建loading 窗口
const showLoading = () => {
  loadingWin = new BrowserWindow({
    frame: false, // 无边框（窗口、工具栏等），只包含网页内容
    width: 200,
    height: 200,
    resizable: false,
    center: true,
    alwaysOnTop: true,
    transparent: true // 窗口是否支持透明，如果想做高级效果最好为true
  })
  loadingWin.loadFile('loading.html')
  loadingWin.on('close', () => {
    loadingWin = null
  })
}
// 创建主程序 窗口
const createWindow = () => {
  win = new BrowserWindow({
    minWidth: 1620,
    minHeight: 900,
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: true,
      webSecurity: false,
      preload: path.join(__dirname, './preload.js')
    },
    show: false
  })// 创建一个窗口

  // 不同环境加载不同文件
  if (app.isPackaged) {
    win.loadFile('dist/index.html')
  } else {
    win.loadURL('http://localhost:6547/')
  }

  // 事件监听
  win.on('close', () => {
    // 回收BrowserWindow对象
    win = null
  })
}

// 事件监听
app.on('ready', async () => {
  showLoading()
  createWindow()
  // 监听渲染进行
  ipcMain.once('close-loading', () => {
    loadingWin.close()
    win.show()
  })

  // 在BrowserWindow创建完成后，注册全局快捷键
  globalShortcut.register('Control+F12', () => {
    win.webContents.toggleDevTools()
  })
})

app.on('window-all-closed', () => {
  app.quit()
})

app.on('activate', () => {
  if (win == null) {
    createWindow()
  }
})