import { app, BrowserWindow, shell, ipcMain } from 'electron'
import { fileURLToPath } from 'node:url'
import path from 'node:path'

const __dirname = path.dirname(fileURLToPath(import.meta.url))

// ─── Paths ──────────────────────────────────────────────────────────────────
// dist-electron/main.js is the compiled output location.
// dist/ is the Vite renderer build output.
const RENDERER_DIST = path.join(__dirname, '../dist')
// vite-plugin-electron outputs preload as .mjs when "type":"module" is set in package.json
const PRELOAD_PATH  = path.join(__dirname, 'preload.mjs')

// ─── Dev server URL ─────────────────────────────────────────────────────────
// vite-plugin-electron sets this env var when running in development mode.
const VITE_DEV_SERVER_URL = process.env.VITE_DEV_SERVER_URL

// ─── Window reference ────────────────────────────────────────────────────────
let mainWindow

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1280,
    height: 800,
    minWidth: 900,
    minHeight: 600,
    title: 'CTM Concierge',
    show: false, // show after ready-to-show to prevent visual flash
    backgroundColor: '#0f1117',
    webPreferences: {
      // ── Security defaults ──────────────────────────────────────────────
      contextIsolation: true,   // Isolates renderer from Electron internals
      nodeIntegration: false,   // Renderer cannot access Node.js APIs directly
      sandbox: true,            // Extra process isolation
      webSecurity: true,
      // ── Preload ────────────────────────────────────────────────────────
      preload: PRELOAD_PATH,
    },
  })

  // Gracefully show window once the DOM is ready to avoid white flash
  mainWindow.once('ready-to-show', () => {
    mainWindow.show()
  })

  // Open external links in the system browser, not Electron
  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    if (url.startsWith('https:') || url.startsWith('http:')) {
      shell.openExternal(url)
    }
    return { action: 'deny' }
  })

  // ── Load the app ─────────────────────────────────────────────────────────
  if (VITE_DEV_SERVER_URL) {
    // Development: load from Vite HMR dev server
    mainWindow.loadURL(VITE_DEV_SERVER_URL)
    mainWindow.webContents.openDevTools()
  } else {
    // Production: load compiled static files
    mainWindow.loadFile(path.join(RENDERER_DIST, 'index.html'))
  }
}

// ─── App lifecycle ───────────────────────────────────────────────────────────
app.whenReady().then(() => {
  createWindow()

  // macOS: re-create window when dock icon is clicked and no windows are open
  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow()
    }
  })
})

// Quit when all windows are closed (except on macOS)
app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
    mainWindow = null
  }
})

// ─── IPC Handlers ────────────────────────────────────────────────────────────
// Register main-process IPC handlers here.
// Example: ipcMain.handle('channel-name', async (event, ...args) => { ... })

ipcMain.handle('app:get-version', () => app.getVersion())