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 = 'P2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 ensureChapterEditor(page: Page): Promise<void> {
  await page.getByRole('button', { name: '+ 新章' }).click()
  await expect(page.locator('.ProseMirror')).toBeVisible({ timeout: 10_000 })
}

test.describe('P2 features', () => {
  let userDataDir: string

  test.beforeEach(() => {
    userDataDir = mkdtempSync(join(tmpdir(), 'bilin-e2e-p2-'))
  })

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

  test('E2E-P2-REF-01: reference panel drag inserts setting text', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await ensureChapterEditor(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 })

    const editor = page.locator('.ProseMirror')
    await editor.click()
    await page.getByTestId('open-reference').click()
    await expect(page.getByTestId('reference-panel')).toBeVisible()

    const refItem = page.locator('[data-testid^="ref-item-"]').first()
    await refItem.dragTo(editor)
    await page.evaluate(() => {
      const editorEl = document.querySelector('.ProseMirror')
      if (!editorEl) return
      const rect = editorEl.getBoundingClientRect()
      const dt = new DataTransfer()
      dt.setData('text/plain', '主角林远')
      editorEl.dispatchEvent(
        new DragEvent('drop', {
          bubbles: true,
          cancelable: true,
          clientX: rect.left + rect.width / 2,
          clientY: rect.top + rect.height / 2,
          dataTransfer: dt
        })
      )
    })

    await expect(editor).toContainText('主角', { timeout: 5_000 })
    await app.close()
  })

  test('E2E-P2-SEARCH-01: global search finds chapter text and jumps', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await ensureChapterEditor(page)

    const unique = '搜索专用词XYZ'
    const editor = page.locator('.ProseMirror')
    await editor.click()
    await editor.pressSequentially(unique)
    await page.keyboard.press('Control+S')
    await expect(page.getByText('已保存')).toBeVisible({ timeout: 10_000 })

    await page.evaluate(() => window.dispatchEvent(new Event('bilin:e2e-open-search')))
    await expect(page.getByTestId('search-modal')).toBeVisible({ timeout: 5_000 })
    await page.getByTestId('search-input').fill(unique)
    await expect(page.locator('.search-result').first()).toBeVisible({ timeout: 10_000 })
    await page.keyboard.press('Enter')
    await expect(page.getByTestId('search-modal')).toBeHidden({ timeout: 5_000 })
    await expect(editor).toContainText(unique)
    await app.close()
  })

  test('E2E-P2-SNAP-01: manual snapshot shows diff', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await ensureChapterEditor(page)

    const editor = page.locator('.ProseMirror')
    await editor.click()
    await editor.pressSequentially('版本快照内容A')
    await page.waitForTimeout(2500)

    await page.getByTestId('open-version').click()
    await expect(page.getByTestId('version-modal')).toBeVisible()
    await page.getByRole('button', { name: '创建快照' }).click()
    await expect(page.locator('.version-item').first()).toBeVisible({ timeout: 10_000 })
    await page.getByRole('button', { name: '取消' }).click()
    await expect(page.getByTestId('version-modal')).toBeHidden()

    await editor.click()
    await editor.press('Control+a')
    await editor.pressSequentially('版本快照内容B')
    await page.waitForTimeout(2500)

    await page.getByTestId('open-version').click()
    await page.locator('.version-item').first().click()
    await expect(page.locator('.diff-view')).toContainText('内容')
    await app.close()
  })

  test('E2E-P2-LAND-01: insert landmark appears in list modal', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await ensureChapterEditor(page)

    await page.evaluate(() => {
      window.dispatchEvent(
        new CustomEvent('bilin:e2e-insert-landmark', { detail: { label: '待查伏笔' } })
      )
    })
    await expect(page.locator('.landmark-mark')).toContainText('待查伏笔', { timeout: 5_000 })

    await page.evaluate(() => window.dispatchEvent(new Event('bilin:e2e-open-landmarks')))
    await expect(page.getByTestId('landmarks-modal')).toBeVisible({ timeout: 5_000 })
    await expect(page.locator('[data-testid^="landmark-item-"]')).toContainText('待查伏笔')
    await app.close()
  })

  test('E2E-P2-WORD-01: word frequency click selects token in editor', async () => {
    const app = await launchApp(userDataDir)
    const page = await app.firstWindow()
    await skipOnboarding(page)
    await createAndOpenBook(page)
    await ensureChapterEditor(page)

    const token = '测'
    const editor = page.locator('.ProseMirror')
    await editor.click()
    await editor.pressSequentially(token.repeat(20))
    await page.keyboard.press('Control+S')
    await expect(page.getByText('已保存')).toBeVisible({ timeout: 10_000 })

    await page.getByTestId('panel-tab-wordfreq').click()
    await expect(page.getByTestId('wordfreq-panel')).toBeVisible()
    await expect(page.getByTestId(`wordfreq-${token}`)).toBeVisible({ timeout: 10_000 })
    await page.getByTestId(`wordfreq-${token}`).click()
    await expect(page.locator('.editor-content-wrap')).toHaveAttribute('data-highlight-token', token)
    await app.close()
  })
})