---
// Censorship-resistance quiz — a progressive-enhancement scorer. EVERYTHING
// the reader needs is server-rendered: the twelve questions (native radios,
// selectable with JS off) and the full scoring key (what each band means +
// where to improve, with deep links into the guide). The client script only
// computes the live score and reveals the result panel; with JS off the
// static key still teaches the whole thing. No third-party request, no inline
// styles (bar widths come from a CSS custom property set via the CSSOM, which
// style-src 'self' allows), no inline handlers (delegated on document).
import { localePath, useT, type Locale } from '../i18n/config'
import { loadQuiz } from '../lib/content'
import Ext from './Ext.astro'

interface Props {
  locale: Locale
}

const { locale } = Astro.props
const t = useT(locale)
const { bands, questions } = loadQuiz(locale)

const localeRoot = `${localePath(locale)}/`.replace('//', '/')
const guideHref = (anchor: string) => `${localeRoot}#${anchor}`
const total = questions.length
const progress0 = t('quiz.progress').replace('{done}', '0').replace('{total}', String(total))
---

<main id="content" class="mx-auto max-w-3xl px-4 py-8">
  <header class="my-8">
    <p class="eyebrow mt-0">{t('quiz.eyebrow')}</p>
    <h1 class="my-2 text-4xl uppercase sm:text-5xl">{t('quiz.title')}</h1>
    <p class="text-dim max-w-[60ch]">{t('quiz.lede')}</p>
    <p class="text-dim font-mono text-xs">{t('quiz.privacyNote')}</p>
    <div class="mt-4 flex flex-wrap gap-2">
      <a
        href="#quiz-form"
        class="rounded-dossier border border-accent bg-accent px-3 py-1.5 font-mono text-xs text-on-accent no-underline"
      >
        {t('quiz.start')}
      </a>
      <a
        href={localeRoot}
        class="rounded-dossier border border-rule bg-surface px-3 py-1.5 font-mono text-xs text-ink no-underline hover:border-accent"
      >
        {t('quiz.readGuide')}
      </a>
    </div>
  </header>

  <div data-quiz-progress class="sticky top-12 z-30 bg-bg/95 py-2 backdrop-blur-sm" hidden>
    <p
      data-quiz-progress-text
      data-tpl={t('quiz.progress')}
      class="eyebrow mt-0 mb-1"
      aria-live="polite"
    >
      {progress0}
    </p>
    <div class="quiz-progress" aria-hidden="true"><i class="quiz-progress__fill"></i></div>
  </div>

  <form id="quiz-form" data-quiz aria-describedby="quiz-note">
    <p id="quiz-note" class="sr-only">{t('quiz.privacyNote')}</p>
    <ol class="m-0 list-none p-0">
      {
        questions.map((question, i) => (
          <li class="my-6">
            <fieldset
              data-quiz-question
              data-cat={question.id}
              class="rounded-dossier border border-rule bg-surface m-0 p-4"
            >
              <legend class="px-1 font-mono text-base font-bold">
                <span class="text-accent">{String(i + 1).padStart(2, '0')}</span> {question.prompt}
              </legend>
              <div class="mt-3 grid gap-2 sm:grid-cols-2">
                {question.options.map((option) => (
                  <label class="rounded-dossier border border-rule bg-surface-2 has-[:checked]:border-accent has-[:checked]:bg-surface flex cursor-pointer flex-col gap-1 p-3">
                    <span class="flex items-start gap-2">
                      <input
                        type="radio"
                        name={question.id}
                        value={option.points}
                        class="mt-1 size-4 shrink-0 cursor-pointer accent-accent"
                      />
                      <span class="font-mono text-sm font-bold">{option.label}</span>
                    </span>
                    <span class="text-dim ms-6 text-sm">{option.hint}</span>
                  </label>
                ))}
              </div>
            </fieldset>
          </li>
        ))
      }
    </ol>
  </form>

  <section
    data-quiz-result
    data-share-tpl={t('quiz.shareText')}
    tabindex="-1"
    aria-live="polite"
    class="rounded-dossier border border-rule border-l-4 border-l-accent bg-surface my-8 p-5"
    hidden
  >
    <p class="eyebrow mt-0 mb-1">{t('quiz.resultEyebrow')}</p>
    <p class="font-mono text-5xl font-bold">
      <span data-quiz-score>0</span><span class="text-dim text-2xl"> {t('quiz.outOf')}</span>
    </p>
    <p data-quiz-band class="text-accent font-mono text-sm font-bold tracking-widest uppercase"></p>
    <p data-quiz-summary class="text-dim"></p>

    <h3 class="mt-6 mb-2 font-mono text-sm uppercase">{t('quiz.barsHeading')}</h3>
    <div data-quiz-bars class="grid gap-2"></div>

    <h3 class="mt-6 mb-2 font-mono text-sm uppercase">{t('quiz.recHeading')}</h3>
    <div data-quiz-recs class="grid gap-2 sm:grid-cols-3"></div>

    <div class="mt-5 flex flex-wrap gap-2 border-t border-rule pt-4">
      <button
        type="button"
        data-quiz-share="copy"
        data-copied={t('quiz.copied')}
        class="rounded-dossier border border-rule bg-surface-2 text-ink cursor-pointer px-3 py-1.5 font-mono text-xs hover:border-accent"
      >
        {t('quiz.copy')}
      </button>
      <button
        type="button"
        data-quiz-share="native"
        class="rounded-dossier border border-rule bg-surface-2 text-ink cursor-pointer px-3 py-1.5 font-mono text-xs hover:border-accent"
        hidden
      >
        {t('quiz.share')}
      </button>
      <Ext
        href="https://x.com/intent/tweet"
        class="quiz-x-share rounded-dossier border border-rule bg-surface-2 text-ink px-3 py-1.5 font-mono text-xs no-underline hover:border-accent"
      >
        {t('quiz.shareX')}
      </Ext>
      <button
        type="button"
        data-quiz-restart
        class="rounded-dossier border border-rule bg-surface text-dim ms-auto cursor-pointer px-3 py-1.5 font-mono text-xs hover:border-accent"
      >
        {t('quiz.restart')}
      </button>
    </div>
  </section>

  <section id="quiz-key" aria-labelledby="quiz-key-bands" class="my-10">
    <h2 id="quiz-key-bands" class="text-2xl uppercase">{t('quiz.bandsHeading')}</h2>
    <ul data-quiz-band-key class="m-0 grid list-none gap-2 p-0">
      {
        bands.map((band) => (
          <li
            data-band-id={band.id}
            data-band-min={band.min}
            data-band-max={band.max}
            class="rounded-dossier border border-rule bg-surface p-3"
          >
            <span class="flex items-baseline gap-2">
              <strong data-band-title class="font-mono text-sm uppercase">
                {band.title}
              </strong>
              <span class="text-dim font-mono text-xs">
                {band.min}–{band.max}
              </span>
            </span>
            <p data-band-summary class="text-dim my-1 text-sm">
              {band.summary}
            </p>
          </li>
        ))
      }
    </ul>

    <h2 class="mt-8 text-2xl uppercase">{t('quiz.categoriesHeading')}</h2>
    <ul data-quiz-cat-key class="m-0 grid list-none gap-2 p-0 sm:grid-cols-2">
      {
        questions.map((question) => (
          <li data-cat={question.id} class="rounded-dossier border border-rule bg-surface p-3">
            <strong data-cat-label class="font-mono text-sm">
              {question.label}
            </strong>
            <p data-cat-rec class="text-dim my-1 text-sm">
              {question.rec}
            </p>
            <a data-cat-link href={guideHref(question.anchor)} class="font-mono text-xs">
              {t('quiz.openGuide')}
            </a>
          </li>
        ))
      }
    </ul>
  </section>
</main>

<script>
  // ── Quiz enhancement ──────────────────────────────────────────────────
  // Delegated on document (survives ClientRouter swaps), re-init on
  // astro:page-load. Answers persist in localStorage 'ecc-quiz'.
  const KEY = 'ecc-quiz'
  type Answers = Record<string, number>

  const qa = <T extends Element>(sel: string, root: ParentNode = document): T[] =>
    Array.from(root.querySelectorAll<T>(sel))
  const one = <T extends Element>(sel: string, root: ParentNode = document): T | null =>
    root.querySelector<T>(sel)

  const form = () => one<HTMLFormElement>('[data-quiz]')

  const readSaved = (): Answers => {
    try {
      const parsed: unknown = JSON.parse(localStorage.getItem(KEY) ?? '{}')
      const out: Answers = {}
      if (parsed && typeof parsed === 'object') {
        for (const [k, v] of Object.entries(parsed as Record<string, unknown>)) {
          if (typeof v === 'number') out[k] = v
        }
      }
      return out
    } catch {
      return {}
    }
  }

  const save = (answers: Answers) => {
    try {
      localStorage.setItem(KEY, JSON.stringify(answers))
    } catch {
      /* private mode: not persisted, quiz still works for this visit */
    }
  }

  type Cat = { cat: string; points: number | null; max: number }

  const scan = (root: HTMLFormElement): { total: number; answered: number; cats: Cat[] } => {
    const cats: Cat[] = []
    let answered = 0
    for (const fs of qa<HTMLFieldSetElement>('[data-quiz-question]', root)) {
      const radios = qa<HTMLInputElement>('input[type="radio"]', fs)
      const max = Math.max(0, ...radios.map((r) => Number(r.value)))
      const checked = radios.find((r) => r.checked)
      if (checked) answered += 1
      cats.push({ cat: fs.dataset.cat ?? '', points: checked ? Number(checked.value) : null, max })
    }
    return { total: cats.length, answered, cats }
  }

  const bandFor = (score: number): { title: string; summary: string } => {
    for (const li of qa<HTMLElement>('[data-quiz-band-key] [data-band-id]')) {
      const min = Number(li.dataset.bandMin)
      const max = Number(li.dataset.bandMax)
      if (score >= min && score <= max) {
        return {
          title: one<HTMLElement>('[data-band-title]', li)?.textContent ?? '',
          summary: one<HTMLElement>('[data-band-summary]', li)?.textContent ?? '',
        }
      }
    }
    return { title: '', summary: '' }
  }

  const catNode = (cat: string) => one<HTMLElement>(`[data-quiz-cat-key] [data-cat="${cat}"]`)
  const catLabel = (cat: string) =>
    one<HTMLElement>('[data-cat-label]', catNode(cat) ?? undefined)?.textContent ?? cat

  const setBar = (fill: HTMLElement, ratio: number) => {
    fill.style.setProperty('--quiz-bar', `${Math.round(ratio * 100)}%`)
  }

  const buildBars = (cats: Cat[]) => {
    const host = one<HTMLElement>('[data-quiz-bars]')
    if (!host) return
    host.textContent = ''
    for (const c of cats) {
      const ratio = c.max > 0 && c.points != null ? c.points / c.max : 0
      const row = document.createElement('div')
      row.className = 'quiz-bar-row'
      const label = document.createElement('span')
      label.className = 'quiz-bar-row__label font-mono text-xs text-dim uppercase'
      label.textContent = catLabel(c.cat)
      const track = document.createElement('div')
      track.className = 'quiz-bar'
      const fill = document.createElement('i')
      fill.className = 'quiz-bar__fill'
      setBar(fill, ratio)
      track.appendChild(fill)
      const val = document.createElement('strong')
      val.className = 'font-mono text-xs'
      val.textContent = `${c.points ?? 0}/${c.max}`
      row.append(label, track, val)
      host.appendChild(row)
    }
  }

  const buildRecs = (cats: Cat[]) => {
    const host = one<HTMLElement>('[data-quiz-recs]')
    if (!host) return
    host.textContent = ''
    const weakest = [...cats]
      .filter((c) => c.points != null)
      .sort((a, b) => a.points! / a.max - b.points! / b.max)
      .slice(0, 3)
    for (const c of weakest) {
      const node = catNode(c.cat)
      const card = document.createElement('div')
      card.className =
        'rounded-dossier border border-rule border-l-2 border-l-accent bg-surface p-3'
      const label = document.createElement('strong')
      label.className = 'font-mono text-sm'
      label.textContent = catLabel(c.cat)
      const rec = document.createElement('p')
      rec.className = 'text-dim my-1 text-sm'
      rec.textContent = one<HTMLElement>('[data-cat-rec]', node ?? undefined)?.textContent ?? ''
      const link = document.createElement('a')
      link.className = 'font-mono text-xs'
      const src = one<HTMLAnchorElement>('[data-cat-link]', node ?? undefined)
      link.href = src?.getAttribute('href') ?? '#'
      link.textContent = src?.textContent ?? ''
      card.append(label, rec, link)
      host.appendChild(card)
    }
  }

  const shareUrl = () => location.href.replace(/[?#].*$/, '')

  const shareMessage = (score: number, band: string): string => {
    const panel = one<HTMLElement>('[data-quiz-result]')
    const tpl = panel?.dataset.shareTpl ?? '{score}/100 — {band}'
    return tpl.replace('{score}', String(score)).replace('{band}', band)
  }

  const showResult = (cats: Cat[]) => {
    const totalPoints = cats.reduce((s, c) => s + (c.points ?? 0), 0)
    const maxPoints = cats.reduce((s, c) => s + c.max, 0)
    const score = maxPoints > 0 ? Math.round((totalPoints / maxPoints) * 100) : 0
    const band = bandFor(score)

    const scoreEl = one<HTMLElement>('[data-quiz-score]')
    if (scoreEl) scoreEl.textContent = String(score)
    const bandEl = one<HTMLElement>('[data-quiz-band]')
    if (bandEl) bandEl.textContent = band.title
    const summaryEl = one<HTMLElement>('[data-quiz-summary]')
    if (summaryEl) summaryEl.textContent = band.summary

    buildBars(cats)
    buildRecs(cats)

    const msg = shareMessage(score, band.title)
    const x = one<HTMLAnchorElement>('.quiz-x-share')
    if (x) x.href = `https://x.com/intent/tweet?text=${encodeURIComponent(`${msg} ${shareUrl()}`)}`

    const panel = one<HTMLElement>('[data-quiz-result]')
    if (panel && panel.hidden) {
      panel.hidden = false
      panel.scrollIntoView({ behavior: 'smooth', block: 'start' })
      panel.focus({ preventScroll: true })
    }
  }

  const hideResult = () => {
    const panel = one<HTMLElement>('[data-quiz-result]')
    if (panel) panel.hidden = true
  }

  const update = () => {
    const root = form()
    if (!root) return
    const { total, answered, cats } = scan(root)

    const block = one<HTMLElement>('[data-quiz-progress]')
    if (block) block.hidden = false
    const fill = one<HTMLElement>('[data-quiz-progress] .quiz-progress__fill')
    if (fill) fill.style.setProperty('--quiz-progress', `${total ? (answered / total) * 100 : 0}%`)
    const text = one<HTMLElement>('[data-quiz-progress-text]')
    if (text)
      text.textContent = (text.dataset.tpl ?? '{done} / {total}')
        .replace('{done}', String(answered))
        .replace('{total}', String(total))

    const answers: Answers = {}
    for (const c of cats) if (c.points != null) answers[c.cat] = c.points
    save(answers)

    if (answered === total && total > 0) showResult(cats)
    else hideResult()
  }

  const restore = () => {
    const root = form()
    if (!root) return
    const native = one<HTMLButtonElement>('[data-quiz-share="native"]')
    if (native) native.hidden = typeof navigator.share !== 'function'

    const saved = readSaved()
    for (const fs of qa<HTMLFieldSetElement>('[data-quiz-question]', root)) {
      const cat = fs.dataset.cat ?? ''
      if (!(cat in saved)) continue
      for (const radio of qa<HTMLInputElement>('input[type="radio"]', fs)) {
        if (Number(radio.value) === saved[cat]) radio.checked = true
      }
    }
    update()
  }

  const restart = () => {
    const root = form()
    if (!root) return
    for (const radio of qa<HTMLInputElement>('input[type="radio"]', root)) radio.checked = false
    try {
      localStorage.removeItem(KEY)
    } catch {
      /* nothing to clear */
    }
    hideResult()
    update()
    root.scrollIntoView({ behavior: 'smooth', block: 'start' })
  }

  document.addEventListener('change', (e) => {
    const target = e.target as HTMLElement
    if (
      target instanceof HTMLInputElement &&
      target.type === 'radio' &&
      target.closest('[data-quiz]')
    )
      update()
  })

  document.addEventListener('click', async (e) => {
    const target = e.target as HTMLElement
    if (target.closest('[data-quiz-restart]')) {
      restart()
      return
    }
    const btn = target.closest<HTMLButtonElement>('[data-quiz-share]')
    if (!btn) return
    const action = btn.dataset.quizShare
    const score = one<HTMLElement>('[data-quiz-score]')?.textContent ?? ''
    const band = one<HTMLElement>('[data-quiz-band]')?.textContent ?? ''
    const message = shareMessage(Number(score), band)
    if (action === 'native') {
      try {
        await navigator.share({ title: document.title, text: message, url: shareUrl() })
      } catch {
        /* dismissed or unsupported */
      }
      return
    }
    if (action === 'copy') {
      try {
        await navigator.clipboard.writeText(`${message} ${shareUrl()}`)
        if (!btn.dataset.label) btn.dataset.label = btn.textContent ?? ''
        btn.textContent = btn.dataset.copied ?? btn.dataset.label
        window.setTimeout(() => {
          btn.textContent = btn.dataset.label ?? ''
        }, 2000)
      } catch {
        /* clipboard unavailable */
      }
    }
  })

  restore()
  document.addEventListener('astro:page-load', restore)
</script>