const { app, BrowserWindow, Menu, Tray, ipcMain, Notification, nativeImage, shell } = require('electron')
const fs = require('fs')
const path = require('path')

const isDev = !!process.env.FABRIC_DESKTOP_URL
const DEFAULT_DEV_URL = 'http://localhost:5173'
const DEFAULT_PROD_ENTRY = path.join(__dirname, 'offline.html')

let mainWindow = null
let tray = null
let isQuitting = false

function configPath() {
  return path.join(app.getPath('userData'), 'fabric-desktop.config.json')
}

function readConfig() {
  try {
    const raw = fs.readFileSync(configPath(), 'utf8')
    return JSON.parse(raw)
  } catch {
    return {
      centerApiBase: 'http://localhost:7001/api',
      guildApiBase: 'http://localhost:7002/api',
      guildSocketBase: 'http://localhost:7002/realtime',
      apiKey: '',
    }
  }
}

function writeConfig(next) {
  fs.mkdirSync(path.dirname(configPath()), { recursive: true })
  fs.writeFileSync(configPath(), JSON.stringify(next, null, 2), 'utf8')
  return next
}

function createMenu() {
  const template = [
    {
      label: 'Fabric',
      submenu: [
        { role: 'reload', accelerator: 'CmdOrCtrl+R' },
        { role: 'toggleDevTools', accelerator: 'CmdOrCtrl+Shift+I' },
        { type: 'separator' },
        { role: 'quit', accelerator: 'CmdOrCtrl+Q' },
      ],
    },
    {
      label: 'Edit',
      submenu: [{ role: 'undo' }, { role: 'redo' }, { type: 'separator' }, { role: 'copy' }, { role: 'paste' }],
    },
  ]
  Menu.setApplicationMenu(Menu.buildFromTemplate(template))
}

function createWindow() {
  const win = new BrowserWindow({
    width: 1280,
    height: 840,
    minWidth: 1024,
    minHeight: 700,
    title: 'Fabric Desktop',
    icon: path.join(__dirname, 'assets/icon.png'),
    autoHideMenuBar: false,
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: true,
      preload: path.join(__dirname, 'preload.js'),
    },
  })

  win.webContents.setWindowOpenHandler(() => ({ action: 'deny' }))
  win.webContents.on('will-navigate', (event, url) => {
    const allowedDev = isDev && url.startsWith((process.env.FABRIC_DESKTOP_URL || DEFAULT_DEV_URL))
    const allowedFile = url.startsWith('file://')
    if (!allowedDev && !allowedFile) {
      event.preventDefault()
      shell.openExternal(url)
    }
  })

  const devUrl = process.env.FABRIC_DESKTOP_URL || DEFAULT_DEV_URL
  if (isDev) {
    win.loadURL(devUrl)
  } else {
    win.loadFile(DEFAULT_PROD_ENTRY)
  }

  win.on('close', (event) => {
    if (!isQuitting) {
      event.preventDefault()
      win.hide()
    }
  })

  return win
}

function createTrayIcon() {
  if (tray) return tray

  const icon = nativeImage.createFromPath(path.join(__dirname, 'assets/tray.png'))

  tray = new Tray(icon)
  tray.setToolTip('Fabric Desktop')

  const buildTrayMenu = () =>
    Menu.buildFromTemplate([
      {
        label: mainWindow?.isVisible() ? '隐藏窗口' : '显示窗口',
        click: () => {
          if (!mainWindow) {
            mainWindow = createWindow()
            return
          }
          if (mainWindow.isVisible()) mainWindow.hide()
          else {
            mainWindow.show()
            mainWindow.focus()
          }
          tray.setContextMenu(buildTrayMenu())
        },
      },
      {
        label: '退出',
        click: () => {
          isQuitting = true
          app.quit()
        },
      },
    ])

  tray.setContextMenu(buildTrayMenu())

  tray.on('double-click', () => {
    if (!mainWindow) {
      mainWindow = createWindow()
      return
    }
    mainWindow.show()
    mainWindow.focus()
    tray.setContextMenu(buildTrayMenu())
  })

  return tray
}

app.whenReady().then(() => {
  createMenu()
  mainWindow = createWindow()
  createTrayIcon()

  ipcMain.handle('fabric:config:get', () => readConfig())
  ipcMain.handle('fabric:config:set', (_evt, next) => writeConfig(next || {}))
  ipcMain.handle('fabric:notify', (_evt, payload) => {
    const title = payload?.title || 'Fabric'
    const body = payload?.body || ''
    if (Notification.isSupported()) {
      new Notification({ title, body }).show()
      return { ok: true }
    }
    return { ok: false }
  })

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) mainWindow = createWindow()
    else if (mainWindow && !mainWindow.isVisible()) mainWindow.show()
  })

  app.on('before-quit', () => {
    isQuitting = true
  })
})

app.on('window-all-closed', () => {
  // 保持后台驻留，由托盘控制退出
})