import { BrowserWindow, app } from 'electron'
import { join } from 'path'
import { existsSync, statSync } from 'fs'

export function createWindow(): BrowserWindow {
  const mainWindow = new BrowserWindow({
    width: 1200,
    height: 800,
    minWidth: 800,
    minHeight: 600,
    icon: join(__dirname, '../assets/icon.ico'),
    webPreferences: {
      preload: join(__dirname, '../preload/index.js'),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: true
    },
    titleBarStyle: 'default',
    show: false
  })

  mainWindow.setMenu(null)

  // H-04: 阻止窗口导航和弹出窗口，防止渲染进程绕过 CSP
  mainWindow.webContents.on('will-navigate', (event) => {
    event.preventDefault()
  })
  mainWindow.webContents.setWindowOpenHandler(() => ({ action: 'deny' }))

  mainWindow.once('ready-to-show', () => {
    mainWindow.show()
  })

  return mainWindow
}

export function setupSingleInstanceLock(
  onSecondInstance: (filePath: string | null) => void
): boolean {
  const gotTheLock = app.requestSingleInstanceLock()
  if (!gotTheLock) {
    app.quit()
    return false
  }

  app.on('second-instance', (_event, commandLine) => {
    const filePath = getFilePathFromArgs(commandLine)
    onSecondInstance(filePath)
  })

  return true
}

// L-08: 使用静态导入 + 验证是文件而非目录
export function getFilePathFromArgs(args: string[]): string | null {
  for (let i = 1; i < args.length; i++) {
    const arg = args[i]
    if (!arg.startsWith('--') && !arg.startsWith('-')) {
      try {
        if (existsSync(arg)) {
          const s = statSync(arg)
          if (s.isFile()) return arg
        }
      } catch {
        // ignore
      }
    }
  }
  return null
}