/* Explicit, per-answer cache approval. No background approval requests. */
(function () {
  function attach(bubble, payload, threadId, baseUrl) {
    const review = payload.cache_review;
    if (!review) return;
    bubble.querySelector('.answer-cache-actions')?.remove();
    const bar = document.createElement('div');
    bar.className = 'answer-cache-actions';
    const status = document.createElement('span');
    status.className = 'answer-cache-status';
    status.setAttribute('role', 'status');
    status.setAttribute('aria-live', 'polite');
    bar.appendChild(status);
    bubble.appendChild(bar);
    if (!review.eligible && !review.cached) {
      status.textContent = review.reason ? '暂不缓存：' + review.reason : '';
      return;
    }
    let cached = Boolean(review.cached);
    let entryId = review.entry_id;
    const button = document.createElement('button');
    button.type = 'button';
    button.className = 'answer-cache-button';
    const label = () => {
      button.textContent = cached ? '撤销缓存' : '答案正确，加入缓存';
      button.setAttribute('aria-label', button.textContent);
    };
    status.textContent = review.hit ? '已复用你确认的历史答案' : '确认答案正确后，可缓存供本会话重复提问使用';
    label();
    button.addEventListener('click', async () => {
      if (button.disabled) return;
      button.disabled = true;
      status.textContent = cached ? '正在撤销…' : '正在加入缓存…';
      try {
        const response = await fetch(baseUrl + '/threads/' + encodeURIComponent(threadId) + '/answer-cache', {
          method: cached ? 'DELETE' : 'POST',
          headers: {'Content-Type': 'application/json'},
          body: JSON.stringify({answer_id: review.answer_id, checkpoint_id: review.checkpoint_id,
                                entry_id: entryId || null})
        });
        const result = await response.json();
        if (!response.ok || result.status !== 'ok') throw new Error(result.detail || result.message || '操作失败，请重试');
        cached = !cached;
        entryId = cached ? result.entry_id : null;
        status.textContent = cached ? '已确认并加入缓存' : '已撤销，后续提问将重新处理';
      } catch (error) {
        status.textContent = error.message || '缓存操作失败，请重试';
      } finally {
        label();
        button.disabled = false;
      }
    });
    bar.appendChild(button);
  }
  window.AnswerCacheUI = {attach};
})();