import path from 'path'
import { mkdtempSync, rmSync, readFileSync, existsSync } from 'fs'
import { join } from 'path'
import { tmpdir } from 'os'
import { test, expect, _electron as electron, type ElectronApplication, type Page } from '@playwright/test'

const ROOT = path.join(import.meta.dirname, '..')

function createUserDataDir(): string {
  return mkdtempSync(join(tmpdir(), 'bilin-e2e-'))
}

async function launchApp(userDataDir: string): Promise<ElectronApplication> {
  return electron.launch({
    args: [ROOT],
    env: {
      ...process.env,
      BILIN_E2E: '1',
      BILIN_E2E_USER_DATA: userDataDir
    }
  })
}

async function waitForApp(page: Page): Promise<void> {
  await page.waitForLoadState('domcontentloaded')
  await expect(page.locator('#app')).toBeVisible({ timeout: 20_000 })
}

async function completeOnboarding(page: Page, penName: string, withSample = false): Promise<void> {
  await waitForApp(page)
  await expect(page.getByText('欢迎使用笔临')).toBeVisible({ timeout: 15_000 })
  for (let i = 0; i < 4; i++) {
    await page.getByTestId('onboarding-next').click()
  }
  await page.getByTestId('onboarding-pen-name').fill(penName)
  if (!withSample) {
    await page.getByText('创建示例书籍').click()
  }
  await page.getByTestId('onboarding-start').click()
  await expect(page.getByText('欢迎使用笔临')).toBeHidden({ timeout: 10_000 })
}

test.describe('Onboarding', () => {
  let userDataDir: string

  test.beforeEach(() => {
    userDataDir = createUserDataDir()
  })

  test.afterEach(async () => {
    if (userDataDir && existsSync(userDataDir)) {
      try {
        rmSync(userDataDir, { recursive: true, force: true, maxRetries: 3, retryDelay: 200 })
      } catch {
        /* electron may still release file handles */
      }
    }
  })

  test('E2E-ONBOARD-02: complete onboarding saves pen name after restart', async () => {
    const app1 = await launchApp(userDataDir)
    const page1 = await app1.firstWindow()
    await completeOnboarding(page1, '山海', false)
    await app1.close()

    const settingsPath = join(userDataDir, 'global_settings.json')
    expect(existsSync(settingsPath)).toBe(true)
    const saved = JSON.parse(readFileSync(settingsPath, 'utf-8')) as { penName: string; onboardingCompleted: boolean }
    expect(saved.penName).toBe('山海')
    expect(saved.onboardingCompleted).toBe(true)

    const app2 = await launchApp(userDataDir)
    const page2 = await app2.firstWindow()
    await expect(page2.getByText('欢迎使用笔临')).toBeHidden({ timeout: 15_000 })
    await page2.getByRole('button', { name: /系统设置/ }).click()
    await expect(page2.getByTestId('settings-pen-name')).toHaveValue('山海')
    await app2.close()
  })
})