// FaqBlock (D-52, UI-SPEC L6) rendered on the server: the SFC is compiled
// with vue/compiler-sfc and rendered with vue/server-renderer, with the
// Nuxt composables it calls (useFaq, useSeoAnswer, useRequestURL,
// useSchemaNode) stubbed on globalThis and FaqList stubbed as a component.
// headingLevel picks the title's element (0 a <p>), the section stays
// labelled by the title, and the FAQPage node it hands to the page graph
// carries the answers as plain text.
import assert from 'node:assert/strict'
import { mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { after, test } from 'node:test'
import { pathToFileURL } from 'node:url'
import { compileScript, parse } from 'vue/compiler-sfc'
import { createSSRApp, h, ref, type Component } from 'vue'
import { renderToString } from 'vue/server-renderer'

const root = new URL('..', import.meta.url)
const dir = mkdtempSync(join(tmpdir(), 'faq-block-'))
after(() => rmSync(dir, { recursive: true, force: true }))

async function loadBlock(): Promise<Component> {
  const source = readFileSync(new URL('app/components/Faq/Block.vue', root), 'utf8')
  const { descriptor } = parse(source, { filename: 'Block.vue' })
  const script = compileScript(descriptor, { id: 'faq-block', inlineTemplate: true, templateOptions: { ssr: true } })
  const code = script.content
    .replaceAll(`from 'vue'`, `from '${import.meta.resolve('vue')}'`)
    .replaceAll(`from "vue"`, `from '${import.meta.resolve('vue')}'`)
    .replaceAll(`from 'vue/server-renderer'`, `from '${import.meta.resolve('vue/server-renderer')}'`)
    .replaceAll(`from "vue/server-renderer"`, `from '${import.meta.resolve('vue/server-renderer')}'`)
    .replaceAll(`'../../utils/faqSchema.ts'`, `'${new URL('app/utils/faqSchema.ts', root).href}'`)
  const file = join(dir, 'Block.ts')
  writeFileSync(file, code)
  return (await import(pathToFileURL(file).href)).default as Component
}

const faq = {
  id: 1,
  slug: 'grzyby',
  name: 'Pytania o grzyby',
  description: '<p>Najczęstsze pytania</p>',
  content: [
    { question: ' Czy chaga jest bezpieczna? ', answer: '<p>Tak, <strong>w&nbsp;umiarkowanych</strong> dawkach.</p><script>x()</script>' },
    { question: 'Jak parzyć?', answer: '<ul><li>Woda 80&#176;C &amp; 5 min</li></ul>' },
  ],
}

const g = globalThis as Record<string, unknown>
let nodes: unknown[] = []

function stub(data: unknown, error: unknown = null) {
  nodes = []
  Object.assign(g, {
    useFaq: async () => ({ data: ref(data), error: ref(error) }),
    useSeoAnswer: () => ref({ action: 'ok', url: 'https://example.test/faq#top' }),
    useRequestURL: () => new URL('https://fallback.test/page'),
    useSchemaNode: (fn: () => unknown) => nodes.push(fn()),
  })
}

const FaqList: Component = { props: ['items', 'exclusive'], setup: (p: { items: unknown[] }) => () => h('div', { class: 'faq-list' }, String(p.items.length)) }
const Block = await loadBlock()

async function render(props: Record<string, unknown>): Promise<string> {
  const app = createSSRApp({ render: () => h(Block, { slug: 'grzyby', ...props }, { fallback: () => h('em', 'fallback') }) })
  app.component('FaqList', FaqList)
  return renderToString(app)
}

test('headingLevel 2 to 4 renders that heading, out-of-range levels are clamped', async () => {
  stub(faq)
  for (const [level, tag] of [[2, 'h2'], [3, 'h3'], [4, 'h4'], [6, 'h4'], [1, 'h2']] as const) {
    const html = await render({ headingLevel: level })
    assert.match(html, new RegExp(`<${tag} id="([^"]+)" class="faq-block__title">Pytania o grzyby</${tag}>`), `level ${level}`)
  }
})

test('headingLevel 0 renders the title as a <p> that still labels the section', async () => {
  stub(faq)
  const html = await render({ headingLevel: 0 })
  const title = html.match(/<p id="([^"]+)" class="faq-block__title">Pytania o grzyby<\/p>/)
  assert.ok(title, html)
  assert.match(html, new RegExp(`<section class="faq-block" aria-labelledby="${title![1]}"`))
  assert.doesNotMatch(html, /<h[1-6]/)
})

test('without a heading the section is labelled by the FAQ name', async () => {
  stub(faq)
  const html = await render({ showHeading: false })
  assert.match(html, /<section class="faq-block" aria-label="Pytania o grzyby"/)
  assert.doesNotMatch(html, /faq-block__title/)
})

test('the FAQPage node: the page URL without fragment, questions trimmed, answers as plain text', async () => {
  stub(faq)
  await render({})
  assert.equal(nodes.length, 1)
  assert.deepEqual(nodes[0], {
    '@type': 'FAQPage',
    '@id': 'https://example.test/faq#faq',
    url: 'https://example.test/faq',
    mainEntity: [
      { '@type': 'Question', name: 'Czy chaga jest bezpieczna?', acceptedAnswer: { '@type': 'Answer', text: 'Tak, w umiarkowanych dawkach.' } },
      { '@type': 'Question', name: 'Jak parzyć?', acceptedAnswer: { '@type': 'Answer', text: 'Woda 80°C & 5 min' } },
    ],
  })
})

test('schema false, a missing FAQ or one without items: no node; the fallback slot instead of an empty block', async () => {
  stub(faq)
  await render({ schema: false })
  assert.deepEqual(nodes, [null])
  stub(null, new Error('404'))
  const missing = await render({})
  assert.match(missing, /<em>fallback<\/em>/)
  assert.doesNotMatch(missing, /faq-block/)
  assert.deepEqual(nodes, [null])
  stub({ ...faq, content: [] })
  assert.match(await render({}), /<em>fallback<\/em>/)
})