const { ipcMain, app, BrowserWindow } = require('electron')

let win1, win2
function createWindows() {
  win1 = new BrowserWindow({
    webPreferences: { nodeIntegration: true, contextIsolation: false },
  })

  win2 = new BrowserWindow({
    y: 0,
    x: 0,
    webPreferences: { nodeIntegration: true, contextIsolation: false },
  })

  win1.webContents.openDevTools()
  win2.webContents.openDevTools()

  win1.loadFile('./index1.html')
  win2.loadFile('./index2.html')
}

function handleIPC() {
  ipcMain.handle('get-win2-id', (_) => win2.webContents.id) // [!code highlight]
  ipcMain.handle('get-win1-id', (_) => win1.webContents.id) // [!code highlight]
}

app.on('ready', () => {
  createWindows()
  handleIPC()
})

const { ipcRenderer } = require('electron')

btn.addEventListener('click', async () => {
  const win2ID = await ipcRenderer.invoke('get-win2-id') // [!code highlight]
  console.log('获取到「窗口2」的id：', win2ID, '并给它发送消息')
  ipcRenderer.sendTo(win2ID, 'renderer1-to-renderer2', 1, 2) // [!code highlight]
})

ipcRenderer.on('renderer2-to-renderer1', (e, a, b) => {
  console.log('「窗口1」收到了「窗口2」发送来的消息')
  console.log('发送者「窗口2」的 id 为：', e.senderId)
  console.log('参数为：', a, b)
})

const { ipcRenderer } = require('electron')

btn.addEventListener('click', async () => {
  const win1ID = await ipcRenderer.invoke('get-win1-id') // [!code highlight]
  console.log('获取到「窗口1」的id：', win1ID, '并给它发送消息')
  ipcRenderer.sendTo(win1ID, 'renderer2-to-renderer1', 3, 4) // [!code highlight]
})

ipcRenderer.on('renderer1-to-renderer2', (e, a, b) => {
  console.log('「窗口2」收到了「窗口1」发送来的消息')
  console.log('发送者「窗口1」的 id 为：', e.senderId)
  console.log('参数为：', a, b)
})