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

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

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

async function skipOnboarding(page: Page): Promise<void> {
  await page.waitForLoadState('domcontentloaded')
  if (await page.getByText('欢迎使用笔临').isVisible()) {
    await page.getByRole('button', { name: '跳过' }).click()
  }
}

async function createAndOpenBook(page: Page, name = 'AI测试书'): Promise<void> {
  await page.getByRole('button', { name: /新建书籍/ }).first().click()
  await page.locator('.dialog-content input').first().fill(name)
  await page.getByRole('button', { name: '创建' }).click()
  await expect(page.locator('#editor-layout')).toBeVisible({ timeout: 15_000 })
}

async function openGlobalSettings(page: Page): Promise<void> {
  const topSettings = page.locator('#topbar button.top-btn').filter({ hasText: '⚙' })
  if (await topSettings.isVisible()) {
    await topSettings.click()
  } else {
    await page.getByRole('button', { name: /系统设置/ }).click()
  }
  await expect(page.locator('#settings-page')).toBeVisible({ timeout: 10_000 })
}

async function seedNamingConflict(page: Page): Promise<void> {
  await page.getByTestId('sidebar-tab-setting').click()
  await page.getByTestId('setting-new').click()
  await page.getByTestId('setting-name-input').fill('林远')
  await page.locator('.dialog-content select').selectOption('character')
  await page.getByRole('button', { name: '创建' }).click()
  const settingItem = page.getByTestId(/setting-item-/).first()
  await expect(settingItem).toBeVisible({ timeout: 10_000 })

  const bookId = await page.locator('#editor-layout').getAttribute('data-book-id')
  const settingTestId = await settingItem.getAttribute('data-testid')
  const settingId = settingTestId?.replace('setting-item-', '') ?? ''
  expect(bookId).toBeTruthy()
  expect(settingId).toBeTruthy()

  await page.evaluate(
    async ({ bookId, settingId }) => {
      const result = await window.electronAPI.setting.update(bookId, settingId, {
        description: '<p>正文中出现了林悦这一名字。</p>'
      })
      if (!result.ok) throw new Error(result.error.message)
    },
    { bookId: bookId!, settingId }
  )

  const saved = await page.evaluate(async (bookId) => {
    const result = await window.electronAPI.setting.list(bookId)
    if (!result.ok) return ''
    return result.data.find((s) => s.name === '林远')?.description ?? ''
  }, bookId!)
  expect(saved).toContain('林悦')
}

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

  test.beforeEach(() => {
    userDataDir = mkdtempSync(join(tmpdir(), 'bilin-e2e-ai-'))
  })

  test.afterEach(() => {
    if (userDataDir && existsSync(userDataDir)) {
      try {
        rmSync(userDataDir, { recursive: true, force: true, maxRetries: 3, retryDelay: 200 })
      } catch {
        /* ignore */
      }
    }
  })

  test('E2E-P3-CHAT-01: send message and receive assistant reply', async () => {
    test.setTimeout(120_000)

    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)

    await page.getByTestId('panel-tab-ai').click()
    await expect(page.getByTestId('ai-panel')).toBeVisible({ timeout: 10_000 })

    await page.getByTestId('ai-session-new').click()
    await expect(page.getByTestId('ai-session-select')).not.toHaveValue('', { timeout: 10_000 })

    await page.getByTestId('ai-chat-input').fill('你好')
    await page.getByTestId('ai-send').click()

    const assistant = page.getByTestId('chat-message-assistant').last()
    await expect(assistant).toBeVisible({ timeout: 90_000 })
    await expect(assistant).not.toBeEmpty()

    await app.close()
  })

  test('E2E-P3-CTX-01: select setting updates context summary', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)

    await page.getByTestId('sidebar-tab-setting').click()
    await page.getByTestId('setting-new').click()
    await page.getByTestId('setting-name-input').fill('主角林远')
    await page.locator('.dialog-content select').selectOption('character')
    await page.getByRole('button', { name: '创建' }).click()
    await expect(page.getByTestId(/setting-item-/)).toBeVisible({ timeout: 10_000 })

    await page.getByTestId('panel-tab-ai').click()
    await page.getByTestId('ai-session-new').click()
    await page.getByTestId('ai-context-preview').click()
    await expect(page.getByTestId('context-editor-modal')).toBeVisible()
    await page.getByTestId('context-tab-setting').click()
    const settingItem = page.locator('[data-testid^="context-item-"]').first()
    await settingItem.locator('input').check()
    await page.getByTestId('context-save').click()
    await expect(page.getByTestId('context-editor-modal')).toBeHidden()
    await expect(page.getByTestId('ai-context-preview')).toContainText('设定1个', { timeout: 10_000 })
    await app.close()
  })

  test('E2E-P3-CMD-01: slash summarize command sends and receives reply', async () => {
    test.setTimeout(120_000)

    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)

    await page.getByTestId('panel-tab-ai').click()
    await page.getByTestId('ai-session-new').click()
    await page.getByTestId('ai-quick-cmd-总结').click()
    await expect(page.getByTestId('ai-send')).toBeEnabled()
    await page.getByTestId('ai-send').click()

    await expect(page.getByTestId('chat-message-user').last()).toContainText('/总结', { timeout: 90_000 })
    const assistant = page.getByTestId('chat-message-assistant').last()
    await expect(assistant).toBeVisible({ timeout: 90_000 })
    await app.close()
  })

  test('E2E-P3-NAME-01: naming check finds conflict between setting and chapter', async () => {
    test.setTimeout(180_000)

    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await seedNamingConflict(page)

    await page.getByTestId('panel-tab-knowledge').click()
    await page.getByTestId('naming-check-open').click()
    await expect(page.getByTestId('naming-check-modal')).toBeVisible()
    await page.getByTestId('naming-run-check').click()

    const row = page.getByTestId('naming-row').first()
    await expect(row).toBeVisible({ timeout: 30_000 })
    await expect(row).toContainText('林远')
    await expect(row).toContainText('林悦')
    await app.close()
  })

  test('E2E-P3-OFF-01: cloud backend disables AI input when offline', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)

    await openGlobalSettings(page)
    await page.getByTestId('settings-nav-ai').click()
    await page.getByTestId('ai-settings-backend').selectOption('openai')
    await page.getByText('AI测试书').click()
    await expect(page.locator('#editor-layout')).toBeVisible({ timeout: 10_000 })

    await page.getByTestId('panel-tab-ai').click()
    await page.getByTestId('ai-session-new').click()
    await page.evaluate(() => {
      window.dispatchEvent(new CustomEvent('bilin:e2e-set-ai-online', { detail: { online: false } }))
    })

    await expect(page.getByTestId('ai-offline-banner')).toBeVisible({ timeout: 10_000 })
    await expect(page.getByTestId('ai-chat-input')).toBeDisabled()
    await expect(page.getByTestId('ai-send')).toBeDisabled()
    await app.close()
  })
})