const sample = {
  idea: 'I’m building a lightweight product feedback tool for people with too many ideas and too many possible features. It should feel useful before becoming a workspace.',
  optionsText: `- Ranked feedback map for pasted feature lists
- Expert reflections on the top options
- Accounts and saved workspaces
- Team voting on feature priority
- Exportable decision brief for Slack or Notion
- Custom criteria builder
- Paid deeper product strategy pass`,
  context: 'MVP, solo builder, needs to feel valuable in under two minutes, avoid dashboard swamp.',
  mode: 'progress',
};

const form = document.querySelector('#rankForm');
const results = document.querySelector('#results');
const toastEl = document.querySelector('#toast');

function escapeHtml(value) {
  return String(value ?? '').replace(/[&<>"']/g, (char) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[char]));
}

function metricPct(value) {
  return Math.max(0, Math.min(100, Math.round(Number(value || 0) * 10)));
}

function toast(message) {
  toastEl.textContent = message;
  toastEl.hidden = false;
  clearTimeout(toastEl._timer);
  toastEl._timer = setTimeout(() => { toastEl.hidden = true; }, 2600);
}

function fillSample() {
  form.idea.value = sample.idea;
  form.optionsText.value = sample.optionsText;
  form.context.value = sample.context;
  form.mode.value = sample.mode;
  document.querySelector('#try')?.scrollIntoView({ behavior: 'smooth', block: 'start' });
  toast('Sample loaded. Run it or replace it with your own mess.');
}

function laneClass(lane) {
  return `lane-${lane?.id || 'defer'}`;
}

function renderMetrics(metrics) {
  const items = [
    ['Value', metrics.value],
    ['Feasible', metrics.feasibility],
    ['Confidence', metrics.confidence],
    ['Revenue', metrics.revenue],
    ['Risk', metrics.risk],
  ];
  return `<div class="metrics">${items.map(([label, value]) => `
    <div class="metric"><span>${label}</span><i><b style="width:${metricPct(value)}%"></b></i></div>
  `).join('')}</div>`;
}

function renderResults(data) {
  const ranked = data.ranked || [];
  const brief = data.brief || {};
  results.hidden = false;
  results.innerHTML = `
    <div class="results-head">
      <p class="eyebrow">${escapeHtml(data.mode?.label || 'Ranked feedback')}</p>
      <h2>${escapeHtml(brief.headline || 'Ranked feedback map')}</h2>
      <p>${escapeHtml(brief.summary || '')}</p>
    </div>

    <div class="ranked-list">
      ${ranked.map((item) => `
        <article class="rank-card ${laneClass(item.lane)}">
          <div class="rank-topline">
            <span class="rank-number">#${item.rank}</span>
            <span class="lane-pill">${escapeHtml(item.lane?.label || 'Ranked')}</span>
            <strong>${item.metrics.score}</strong>
          </div>
          <h3>${escapeHtml(item.title)}</h3>
          ${item.description && item.description !== item.title ? `<p class="item-description">${escapeHtml(item.description)}</p>` : ''}
          <p><b>Why:</b> ${escapeHtml(item.reason)}.</p>
          <p><b>Concern:</b> ${escapeHtml(item.concern)}</p>
          ${renderMetrics(item.metrics)}
        </article>
      `).join('')}
    </div>

    <div class="brief-grid">
      <article class="brief-card next-card">
        <span>Next 48 hours</span>
        <ol>${(brief.next48Hours || []).map((step) => `<li>${escapeHtml(step)}</li>`).join('')}</ol>
      </article>
      ${(brief.expertReflections || []).map((reflection) => `
        <article class="brief-card">
          <span>${escapeHtml(reflection.lens)}</span>
          <p>${escapeHtml(reflection.text)}</p>
        </article>
      `).join('')}
    </div>
    <p class="caution">${escapeHtml(brief.caution || 'First-pass judgement, not an oracle.')}</p>
  `;
  results.scrollIntoView({ behavior: 'smooth', block: 'start' });
}

async function createFeedbackMap(event) {
  event.preventDefault();
  const submit = form.querySelector('button[type="submit"]');
  const payload = Object.fromEntries(new FormData(form).entries());
  submit.disabled = true;
  submit.textContent = 'Ranking…';
  try {
    const response = await fetch('/api/rank-feedback', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });
    const data = await response.json();
    if (!response.ok) throw new Error(data.error || 'Could not rank this list.');
    renderResults(data);
  } catch (error) {
    toast(error.message);
  } finally {
    submit.disabled = false;
    submit.textContent = 'Create ranked feedback map';
  }
}

form.addEventListener('submit', createFeedbackMap);
document.querySelector('#loadSample')?.addEventListener('click', fillSample);
document.querySelector('#loadSampleTop')?.addEventListener('click', fillSample);