{% extends "base.html" %}
{% block title %}Прохождение теста{% endblock %}

{% block content %}
<div class="test-detail-page" id="attempt-root" data-test-id="{{ test_id }}" data-attempt-id="{{ attempt_id }}">
  <p class="link-back"><a href="/tests">← к списку тестов</a></p>
  <h1 class="font-headline" style="font-size:1.35rem;margin-top:0;" id="attempt-title">Загрузка…</h1>
  <p class="text-muted" style="margin-top:0;" id="attempt-subtitle"></p>
  <p class="text-muted" id="attempt-timer" style="margin-top:0;display:none;font-weight:600;"></p>
  <p class="error-text" id="attempt-error" style="display:none;"></p>

  <ol id="questions-list" style="padding-left:1.25rem;"></ol>

  <div class="inline-actions" style="margin-top:1rem;">
    <button type="button" class="btn btn-primary" id="submit-attempt-btn">Завершить тест</button>
  </div>

  <div id="attempt-result" class="surface-card" style="display:none;margin-top:1rem;padding:1rem;"></div>

  <dialog id="hint-modal" style="border:none;border-radius:14px;padding:0;max-width:480px;width:90%;box-shadow:0 12px 40px rgba(0,0,0,0.18);">
    <div style="padding:1rem 1.25rem;">
      <h3 id="hint-title" style="margin:0 0 0.5rem 0;font-size:1.05rem;">Подсказка</h3>
      <p id="hint-verdict" style="margin:0 0 0.5rem 0;font-weight:600;"></p>
      <p id="hint-correct" style="margin:0 0 0.5rem 0;font-size:0.9rem;color:#506965;"></p>
      <p id="hint-explanation" style="margin:0;font-size:0.95rem;line-height:1.4;"></p>
      <div class="inline-actions" style="margin-top:0.85rem;justify-content:flex-end;">
        <button type="button" class="btn btn-primary btn--sm" id="hint-close-btn">Понятно</button>
      </div>
    </div>
  </dialog>
</div>

<script>
(() => {
  const root = document.getElementById('attempt-root');
  const testId = root.dataset.testId;
  const attemptId = root.dataset.attemptId;
  const titleEl = document.getElementById('attempt-title');
  const subEl = document.getElementById('attempt-subtitle');
  const timerEl = document.getElementById('attempt-timer');
  const errEl = document.getElementById('attempt-error');
  const listEl = document.getElementById('questions-list');
  const resultEl = document.getElementById('attempt-result');
  const submitBtn = document.getElementById('submit-attempt-btn');
  const hintModal = document.getElementById('hint-modal');
  const hintTitle = document.getElementById('hint-title');
  const hintVerdict = document.getElementById('hint-verdict');
  const hintCorrect = document.getElementById('hint-correct');
  const hintExplanation = document.getElementById('hint-explanation');
  const hintCloseBtn = document.getElementById('hint-close-btn');

  let playData = null;
  const selections = {};
  const checked = {};
  let timerHandle = null;
  let deadlineMs = null;

  function esc(s) {
    return String(s ?? '').replace(/[&<>"']/g, (m) => ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[m]));
  }
  function setErr(msg) {
    errEl.textContent = msg || 'Ошибка.';
    errEl.style.display = '';
  }
  function isSelected(qid, oid) {
    return (selections[String(qid)] || []).includes(String(oid));
  }
  function toggle(qid, oid, multi) {
    const k = String(qid);
    const cur = selections[k] || [];
    const id = String(oid);
    if (multi) {
      selections[k] = cur.includes(id) ? cur.filter(x => x !== id) : [...cur, id];
      return;
    }
    selections[k] = [id];
  }
  function isImmediate() {
    return playData && playData.resultMode === 'immediate';
  }

  function renderQuestions() {
    listEl.innerHTML = '';
    for (const q of (playData.questions || [])) {
      const qid = String(q.id);
      const isChecked = !!checked[qid];
      const li = document.createElement('li');
      li.style.marginBottom = '1.5rem';
      li.dataset.qid = qid;
      let badge = '';
      if (isChecked) {
        const ok = checked[qid].isCorrect;
        badge = '<span style="margin-left:8px;font-size:0.8rem;font-weight:600;color:' +
          (ok ? '#1a7a4a' : '#b32d2d') + ';">' + (ok ? '✓ верно' : '✗ неверно') + '</span>';
      }
      li.innerHTML = '<p style="margin-top:0;margin-bottom:0.5rem;">' + esc(q.text) + badge + '</p>';
      const ul = document.createElement('ul');
      ul.style.listStyle = 'none';
      ul.style.padding = '0';
      ul.style.margin = '0';
      const correctSet = new Set((checked[qid] && checked[qid].correctOptionIds) || []);
      for (const o of (q.options || [])) {
        const oid = String(o.id);
        const row = document.createElement('li');
        row.style.marginBottom = '6px';
        const type = q.hasMultipleAnswers ? 'checkbox' : 'radio';
        const name = 'q-' + q.id;
        let mark = '';
        if (isChecked) {
          if (correctSet.has(oid)) mark = ' <span style="color:#1a7a4a;font-weight:600;">(верно)</span>';
          else if (isSelected(q.id, o.id)) mark = ' <span style="color:#b32d2d;">(ваш ответ)</span>';
        }
        row.innerHTML =
          '<label style="display:flex;align-items:flex-start;gap:8px;cursor:' + (isChecked ? 'default' : 'pointer') + ';' +
            (isChecked ? 'opacity:0.85;' : '') + '">' +
          '<input type="' + type + '" ' + (q.hasMultipleAnswers ? '' : ('name="' + name + '"')) + ' ' +
          (isSelected(q.id, o.id) ? 'checked' : '') + ' ' + (isChecked ? 'disabled' : '') + ' />' +
          '<span>' + esc(o.text) + mark + '</span>' +
          '</label>';
        const input = row.querySelector('input');
        input.addEventListener('change', () => {
          if (checked[qid]) return;
          toggle(q.id, o.id, q.hasMultipleAnswers);
          renderQuestions();
        });
        ul.appendChild(row);
      }
      li.appendChild(ul);

      if (isImmediate() && !isChecked) {
        const btn = document.createElement('button');
        btn.type = 'button';
        btn.className = 'btn btn-ghost btn--sm';
        btn.textContent = 'Ответить';
        btn.style.marginTop = '0.4rem';
        const sel = selections[qid] || [];
        btn.disabled = sel.length === 0;
        btn.addEventListener('click', () => checkOne(q.id));
        li.appendChild(btn);
      }
      listEl.appendChild(li);
    }
  }

  async function checkOne(qid) {
    const k = String(qid);
    const sel = selections[k] || [];
    if (!sel.length) return;
    try {
      const r = await fetch('/api/tests/' + testId + '/attempts/' + attemptId + '/check', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ questionId: qid, selectedOptionIds: sel }),
      });
      const data = await r.json().catch(() => ({}));
      if (!r.ok) throw new Error(data.error || 'Не удалось проверить ответ.');
      checked[k] = data;
      renderQuestions();
      if (playData.hintsEnabled) {
        showHint(data);
      }
    } catch (e) {
      setErr(e.message);
    }
  }

  function showHint(data) {
    hintVerdict.textContent = data.isCorrect ? 'Верно!' : 'Неверно.';
    hintVerdict.style.color = data.isCorrect ? '#1a7a4a' : '#b32d2d';
    const correct = (data.correctOptionTexts || []).join('; ');
    hintCorrect.textContent = correct ? ('Правильный ответ: ' + correct) : '';
    hintExplanation.textContent = data.explanation || 'Объяснение недоступно.';
    if (typeof hintModal.showModal === 'function') hintModal.showModal();
    else hintModal.setAttribute('open', '');
  }
  hintCloseBtn.addEventListener('click', () => {
    if (typeof hintModal.close === 'function') hintModal.close();
    else hintModal.removeAttribute('open');
  });

  function startTimer(minutes) {
    if (!minutes || minutes <= 0) return;
    deadlineMs = Date.now() + minutes * 60 * 1000;
    timerEl.style.display = '';
    const tick = () => {
      const left = Math.max(0, deadlineMs - Date.now());
      const m = Math.floor(left / 60000);
      const s = Math.floor((left % 60000) / 1000);
      timerEl.textContent = 'Осталось: ' + m + ':' + String(s).padStart(2, '0');
      if (left <= 0) {
        clearInterval(timerHandle);
        submit(true);
      }
    };
    tick();
    timerHandle = setInterval(tick, 500);
  }

  async function load() {
    try {
      const r = await fetch('/api/tests/' + testId + '/attempts/' + attemptId + '/play');
      const data = await r.json().catch(() => ({}));
      if (!r.ok) throw new Error(data.error || 'Не удалось открыть попытку.');
      playData = data;
      titleEl.textContent = data.testTitle || 'Прохождение теста';
      const parts = ['Порог зачёта: ' + (data.passingThreshold ?? 0) + '%'];
      if (data.resultMode === 'immediate') parts.push('Результат сразу после ответа');
      if (data.hintsEnabled) parts.push('С ИИ-подсказками');
      subEl.textContent = parts.join(' · ') + '.';
      if (!Array.isArray(data.questions) || !data.questions.length) {
        setErr('В активной версии нет вопросов.');
        submitBtn.disabled = true;
        return;
      }
      renderQuestions();
      if (data.timeLimit) startTimer(Number(data.timeLimit));
    } catch (e) {
      setErr(e.message);
      submitBtn.disabled = true;
    }
  }

  async function submit(auto) {
    submitBtn.disabled = true;
    submitBtn.textContent = auto ? 'Время вышло, отправка…' : 'Отправка…';
    try {
      const r = await fetch('/api/tests/' + testId + '/attempts/' + attemptId + '/submit', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ answers: selections }),
      });
      const data = await r.json().catch(() => ({}));
      if (!r.ok) throw new Error(data.error || 'Не удалось завершить попытку.');
      if (timerHandle) clearInterval(timerHandle);
      timerEl.style.display = 'none';
      resultEl.style.display = '';
      resultEl.innerHTML =
        '<h3 style="margin-top:0;">Результат</h3>' +
        '<p>Правильно: <strong>' + data.correctCount + '</strong> из ' + data.totalQuestions +
        ' (' + data.percent + '%). Порог: ' + data.passingThreshold + '%.</p>' +
        '<p class="' + (data.passed ? 'text-muted' : 'error-text') + '">' + (data.passed ? 'Зачёт.' : 'Незачёт.') + '</p>' +
        '<p><a href="/tests/' + testId + '/attempts/' + data.attemptId + '/review">Разбор попытки</a></p>';
      submitBtn.style.display = 'none';
    } catch (e) {
      setErr(e.message);
      submitBtn.disabled = false;
      submitBtn.textContent = 'Завершить тест';
    }
  }

  submitBtn.addEventListener('click', () => submit(false));
  load();
})();
</script>
{% endblock %}