(function () {
  'use strict';

  const section = document.querySelector('.djb-comment-section');
  if (!section) return;

  const inquiryId = section.getAttribute('data-inquiry-id');
  const closed = section.getAttribute('data-closed') === 'true';
  const listEl = document.getElementById('djbCommentList');
  const emptyEl = document.getElementById('djbCommentEmpty');
  const countEl = document.getElementById('djbCommentCount');
  const formEl = document.getElementById('djbCommentForm');
  const inputEl = document.getElementById('djbCommentInput');
  const counterEl = document.getElementById('djbCommentCharCounter');
  const privateEl = document.getElementById('djbCommentPrivate');

  function getCsrfToken() {
    // 세션 기반 CSRF: 쿠키 대신 <meta name="_csrf">에서 토큰을 읽는다.
    const meta = document.querySelector('meta[name="_csrf"]');
    return meta ? meta.getAttribute('content') : '';
  }

  function fetchJson(url, options) {
    options = options || {};
    const headers = Object.assign({}, options.headers || {});
    const method = (options.method || 'GET').toUpperCase();
    if (method !== 'GET' && method !== 'HEAD') {
      headers['X-XSRF-TOKEN'] = getCsrfToken();
    }
    if (options.body && !headers['Content-Type']) {
      headers['Content-Type'] = 'application/json;charset=UTF-8';
    }
    return fetch(url, Object.assign({ credentials: 'same-origin' }, options, { headers: headers }));
  }

  function escapeHtml(text) {
    if (text == null) return '';
    return String(text)
      .replace(/&/g, '&amp;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#39;');
  }

  function formatDate(value) {
    if (!value) return '';
    try {
      var d;
      if (Array.isArray(value)) {
        // Jackson LocalDateTime 직렬화(timestamp 배열): [year, month(1-base), day, hour, minute, second, nano]
        var y = value[0], mo = value[1] || 1, da = value[2] || 1;
        var h = value[3] || 0, mi = value[4] || 0, s = value[5] || 0;
        d = new Date(y, mo - 1, da, h, mi, s);
      } else {
        d = new Date(value);
      }
      if (isNaN(d.getTime())) return '';
      const pad = function (n) { return n < 10 ? '0' + n : '' + n; };
      return d.getFullYear() + '.' + pad(d.getMonth() + 1) + '.' + pad(d.getDate())
        + ' ' + pad(d.getHours()) + ':' + pad(d.getMinutes());
    } catch (e) {
      return '';
    }
  }

  function render(comments) {
    listEl.innerHTML = '';
    if (!comments || comments.length === 0) {
      const li = document.createElement('li');
      li.className = 'djb-comment-empty';
      li.textContent = '아직 등록된 댓글이 없습니다.';
      listEl.appendChild(li);
      return;
    }
    comments.forEach(function (c) {
      const li = document.createElement('li');
      var cls = 'djb-comment-item';
      if (c.adminYn === 'Y') cls += ' djb-comment-item--admin';
      if (c.privatePlaceholder) cls += ' djb-comment-item--private-hidden';
      else if (c.privateComment) cls += ' djb-comment-item--private';
      li.className = cls;
      li.setAttribute('data-comment-id', c.id);

      var writerHtml = (c.adminYn === 'Y')
        ? '<span class="djb-comment-admin-badge">관리자</span>'
        : '<span class="djb-comment-writer">' + escapeHtml(c.writerName || '(알 수 없음)') + '</span>';
      // 비공개 댓글(열람 권한 있는 경우)에는 "비공개" 태그 표시
      var privateTag = (c.privateComment && !c.privatePlaceholder)
        ? '<span class="djb-comment-private-tag">비공개</span>' : '';

      li.innerHTML = ''
        + '<div class="djb-comment-meta">'
        + '  <div class="djb-comment-meta-left">'
        + '    <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 2px; opacity: 0.5;">'
        + '      <path d="M5 3v5a2 2 0 0 0 2 2h5 M9 7l3 3-3 3" stroke="#000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>'
        + '    </svg>'
        + writerHtml
        + privateTag
        + '  </div>'
        + '  <div class="djb-comment-meta-right">'
        + '    <span class="djb-comment-date">' + escapeHtml(formatDate(c.createdDate)) + '</span>'
        + (c.deletable ? '    <button type="button" class="djb-comment-delete-btn" data-id="' + escapeHtml(c.id) + '">삭제</button>' : '')
        + '  </div>'
        + '</div>'
        + '<div class="djb-comment-body">' + escapeHtml(c.content) + '</div>';
      listEl.appendChild(li);
    });
  }

  function load() {
    fetchJson('/djb/inquiry/' + encodeURIComponent(inquiryId) + '/comments')
      .then(function (res) {
        if (!res.ok) throw new Error('댓글 조회에 실패했습니다.');
        return res.json();
      })
      .then(render)
      .catch(function (err) {
        console.error('[djb-comments] load error', err);
      });
  }

  function handleSubmit() {
    const content = (inputEl.value || '').trim();
    if (!content) {
      if (window.customPopups) window.customPopups.showAlert('댓글 내용을 입력해 주세요.');
      inputEl.focus();
      return;
    }
    var visibility = (privateEl && privateEl.checked) ? 'PRIVATE' : 'ALL';
    fetchJson('/djb/inquiry/' + encodeURIComponent(inquiryId) + '/comments', {
      method: 'POST',
      body: JSON.stringify({ content: content, visibility: visibility })
    })
      .then(function (res) {
        if (res.status === 409) throw new Error('종료된 문의에는 댓글을 작성할 수 없습니다.');
        // 작성 빈도 제한(무제한 요청 차단) — 서버가 내려준 안내 문구를 그대로 보여준다.
        if (res.status === 429) {
          return res.json()
            .catch(function () { return {}; })
            .then(function (body) {
              throw new Error(body.message || '작성 빈도 제한을 초과했습니다. 잠시 후 다시 시도해 주세요.');
            });
        }
        if (!res.ok) throw new Error('댓글 등록에 실패했습니다.');
        return res.json();
      })
      .then(function () {
        inputEl.value = '';
        if (privateEl) privateEl.checked = false;
        updateCounter();
        load();
      })
      .catch(function (err) {
        if (window.customPopups) window.customPopups.showAlert(err.message);
        else alert(err.message);
      });
  }

  function handleDelete(commentId) {
    if (!commentId) return;
    function doDelete() {
      fetchJson('/djb/inquiry/comments/' + encodeURIComponent(commentId), { method: 'DELETE' })
        .then(function (res) {
          if (res.status === 403) throw new Error('본인이 작성한 댓글만 삭제할 수 있습니다.');
          if (res.status === 409) throw new Error('종료된 문의에는 댓글을 삭제할 수 없습니다.');
          if (!res.ok && res.status !== 204) throw new Error('댓글 삭제에 실패했습니다.');
          load();
        })
        .catch(function (err) {
          if (window.customPopups) window.customPopups.showAlert(err.message);
          else alert(err.message);
        });
    }
    if (window.customPopups) {
      window.customPopups.showConfirm('댓글을 삭제하시겠습니까?', function (ok) {
        if (ok) doDelete();
      });
    } else if (window.confirm('댓글을 삭제하시겠습니까?')) {
      doDelete();
    }
  }

  function updateCounter() {
    if (!counterEl || !inputEl) return;
    const max = inputEl.getAttribute('maxlength') || '2000';
    counterEl.textContent = (inputEl.value || '').length + ' / ' + max;
  }

  if (!closed && formEl) {
    formEl.addEventListener('submit', function (e) {
      e.preventDefault();
      handleSubmit();
    });
    inputEl.addEventListener('input', updateCounter);
    updateCounter();
  }

  listEl.addEventListener('click', function (e) {
    const target = e.target;
    if (target && target.classList.contains('djb-comment-delete-btn')) {
      handleDelete(target.getAttribute('data-id'));
    }
  });

  load();
})();