import { expect, test, type Page } from '@playwright/test'

const user = { id: 42, username: 'fictional-keyboard', role: 'learner' }
const item = { id: 11, term: 'curiosity', originalForm: 'curiosity', definition: '好奇心；求知欲', examples: ['Curious minds ask.'], status: 'new', level: 0, kind: 'word', wordCount: 1, dueAt: '2026-01-02T00:00:00Z', reviewCount: 0 }

async function mockApi(page: Page): Promise<void> {
  await page.route('**/api/v1/**', async route => {
    const url = new URL(route.request().url())
    const path = url.pathname
    const method = route.request().method()
    let data: unknown = null
    if (path === '/api/v1/login') data = { token: 'fictional-session', user }
    else if (path === '/api/v1/me') data = user
    else if (path === '/api/v1/space') data = { ownerId: user.id, language: 'en' }
    else if (path === '/api/v1/books') data = { items: [] }
    else if (path === '/api/v1/reviews/queue') data = { items: [item], total: 1 }
    else if (path.endsWith('/answers') && method === 'POST') {
      data = { result: 'applied', duplicate: false, grade: 'correct', requeued: false, statusBefore: 'new', statusAfter: 'learning', levelBefore: 0, levelAfter: 1, dueAtBefore: item.dueAt, dueAtAfter: '2026-01-09T00:00:00Z', item }
    } else if (path === '/api/v1/terms' && method === 'GET') {
      data = { items: [{ ...item, updatedAt: '2026-01-02T00:00:00Z' }], total: 1, page: 1, limit: 20 }
    }
    await route.fulfill({ json: { code: 200, data } })
  })
}

/** Presses Tab until the target holds the focus, so reachability is what is being tested. */
async function tabUntilFocused(page: Page, target: ReturnType<Page['getByTestId']>, limit = 15): Promise<boolean> {
  for (let step = 0; step < limit; step += 1) {
    if (await target.evaluate(element => element === document.activeElement).catch(() => false)) return true
    await page.keyboard.press('Tab')
  }
  return target.evaluate(element => element === document.activeElement).catch(() => false)
}

async function login(page: Page): Promise<void> {
  await page.goto('/')
  await page.getByLabel('账号').fill(user.username)
  await page.getByLabel('密码', { exact: true }).fill('fictional-password')
  await page.getByRole('button', { name: '登录', exact: true }).click()
  await expect(page.getByRole('heading', { name: '我的书库' })).toBeVisible()
}

test('the due review can be driven from the keyboard alone', async ({ page }) => {
  await mockApi(page)
  await login(page)
  await page.locator('.site-header nav').getByRole('link', { name: '到期复习' }).click()
  await expect(page.getByTestId('review-card')).toBeVisible()
  await expect(page.getByTestId('review-shortcuts')).toContainText('空格')

  // The first action already holds the focus, so a keyboard user can keep going.
  await expect(page.getByTestId('review-reveal')).toBeFocused()

  // Space shows the answer, and the answer panel is announced as text.
  await page.keyboard.press('Space')
  await expect(page.getByTestId('review-definition')).toContainText('好奇心')
  await expect(page.getByTestId('review-correct')).toBeFocused()

  // A digit grades the card without touching the mouse.
  await page.keyboard.press('1')
  await expect(page.getByTestId('review-summary')).toBeVisible()
  await page.screenshot({ path: '../.local/evidence/issue14-keyboard-review.png' })

  // Tab reaches the closing action within a few presses, not after walking the whole page.
  expect(await tabUntilFocused(page, page.getByTestId('review-finish'), 6)).toBe(true)
  await page.keyboard.press('Enter')
  await expect(page.getByRole('heading', { name: '我的书库' })).toBeVisible()
})

test('typing in a form never triggers a global shortcut', async ({ page }) => {
  await mockApi(page)
  await login(page)
  await page.locator('.site-header nav').getByRole('link', { name: '生词本' }).click()
  await expect(page.locator('.vocab-row')).toHaveCount(1)
  const search = page.getByLabel('搜索词 / 释义')
  await search.click()
  await search.type('curiosity 1 2 quit')
  await expect(search).toHaveValue('curiosity 1 2 quit')
  // The list only changes when the search is submitted, not while typing.
  await expect(page.locator('.vocab-row')).toHaveCount(1)
})

test('the display control shows a visible focus ring', async ({ page }) => {
  await mockApi(page)
  await login(page)
  const trigger = page.getByTestId('display-trigger')
  // Reached by keyboard, which is what makes the focus ring appear in the first place.
  expect(await tabUntilFocused(page, trigger)).toBe(true)
  const outline = await trigger.evaluate(element => {
    const style = getComputedStyle(element)
    return { width: style.outlineWidth, style: style.outlineStyle }
  })
  expect(parseFloat(outline.width)).toBeGreaterThanOrEqual(2)
  expect(outline.style).not.toBe('none')
})