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

import {
  articleSelectorForPagePath,
  browserLikeUserAgent,
  collectDocsOwnedLinks,
  parseDocsE2EPagePaths,
} from '../utils/docs-links.js'

const pagePaths = parseDocsE2EPagePaths(process.env.DOCS_E2E_PAGE_PATHS)

test.describe('Docs owned pages', () => {
  // playwright.config.ts sets fullyParallel: false, and Playwright shards
  // work by file rather than by test in that mode — without this, every test
  // in this single spec file runs on one worker no matter what --workers is
  // passed. Opt this describe block into parallel scheduling explicitly.
  test.describe.configure({ mode: 'parallel' })

  test('resolved page list must not be empty', () => {
    expect(
      pagePaths.length,
      'No pages to test. `pnpm e2e:docs` resolves pages from git changes by default, ' +
        'or set DOCS_E2E_PAGE_PATHS explicitly.'
    ).toBeGreaterThan(0)
  })

  for (const pagePath of pagePaths) {
    test(`${pagePath} loads and docs-owned article links resolve`, async ({ page }, testInfo) => {
      const baseURL = testInfo.project.use.baseURL
      expect(baseURL, 'A Playwright base URL should be configured').toBeTruthy()

      const articleSelector = articleSelectorForPagePath(pagePath)
      const response = await page.goto(pagePath)
      expect(response, `Expected a response for ${pagePath}`).not.toBeNull()
      expect(
        response!.ok(),
        `Page should return a successful status, got ${response!.status()}`
      ).toBeTruthy()

      const article = page.locator(articleSelector)
      await expect(article, 'Page article should be present').toBeVisible()
      await expect(
        article.getByRole('heading', { level: 1 }),
        'Page article should include an h1'
      ).toBeVisible()

      const links = await collectDocsOwnedLinks(page, baseURL!, articleSelector)
      const userAgent = await browserLikeUserAgent(page)

      for (const url of links) {
        try {
          const linkResponse = await page.request.get(url, { headers: { 'user-agent': userAgent } })
          expect
            .soft(linkResponse.ok(), `${url} should resolve (status ${linkResponse.status()})`)
            .toBeTruthy()
        } catch (error) {
          expect
            .soft(
              null,
              `${url} should be reachable (${error instanceof Error ? error.message : error})`
            )
            .toBeTruthy()
        }
      }
    })
  }
})