// 页面加载时初始化
document.addEventListener('DOMContentLoaded', () => {
  loadData();
  initForm();
  initModal();
});

// 全局变量存储当前数据和排序状态
let currentRecords = [];
let currentSortField = null;
let currentSortOrder = 'asc'; // 'asc' 或 'desc'

// 初始化表单
function initForm() {
  const form = document.getElementById('submitForm');
  const noteInput = document.getElementById('note');
  const noteCount = document.getElementById('noteCount');

  // 字数统计
  noteInput.addEventListener('input', () => {
    noteCount.textContent = noteInput.value.length;
  });

  // 表单提交
  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    await submitForm();
  });
}

// 提交表单
async function submitForm() {
  const form = document.getElementById('submitForm');
  const name = document.getElementById('name').value;
  const link = document.getElementById('link').value;
  const note = document.getElementById('note').value;

  try {
    const submitBtn = form.querySelector('button[type="submit"]');
    submitBtn.disabled = true;
    submitBtn.textContent = '提交中...';

    const response = await fetch('/api/submit', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        name: name,
        link: link,
        note: note
      })
    });

    const result = await response.json();

    if (result.success) {
      alert('✅ 提交成功！');
      form.reset();
      document.getElementById('noteCount').textContent = '0';
      loadData(); // 刷新数据列表
    } else {
      alert('❌ ' + result.message);
    }
  } catch (error) {
    alert('❌ 提交失败: ' + error.message);
  } finally {
    const submitBtn = form.querySelector('button[type="submit"]');
    submitBtn.disabled = false;
    submitBtn.textContent = '提交数据';
  }
}

// 加载数据列表
async function loadData() {
  try {
    const response = await fetch('/api/list');
    const result = await response.json();

    if (result.success) {
      currentRecords = result.records;
      renderTable(currentRecords);
    } else {
      alert('加载数据失败: ' + result.message);
    }
  } catch (error) {
    console.error('加载数据出错:', error);
    document.getElementById('dataTableBody').innerHTML = `
      <tr><td colspan="9" class="loading">加载失败，请刷新重试</td></tr>
    `;
  }
}

// 渲染表格
function renderTable(records) {
  const tbody = document.getElementById('dataTableBody');

  if (records.length === 0) {
    tbody.innerHTML = '<tr><td colspan="9" class="loading">暂无数据</td></tr>';
    return;
  }

  tbody.innerHTML = records.map((record, index) => {
    const hasNaga = record.nagaLink && record.nagaLink.trim() !== '';
    const nagaStatus = hasNaga 
      ? '<span class="has-naga">✔ 有</span>' 
      : '<span class="no-naga">✘ 无</span>';

    const nagaLinkDisplay = hasNaga 
      ? `<a href="${escapeHtml(record.nagaLink)}" target="_blank">查看链接</a>`
      : '-';

    const nagaNoteDisplay = record.nagaNote && record.nagaNote.trim() !== ''
      ? escapeHtml(record.nagaNote)
      : '-';

    const imagesDisplay = record.images && record.images.length > 0
      ? `<div class="image-thumbs">
          ${record.images.map(img => `
            <img src="${img}" class="thumb-img" onclick="showImages(${JSON.stringify(record.images).replace(/"/g, '&quot;')})">
          `).join('')}
        </div>`
      : '-';

    return `
      <tr>
        <td>${index + 1}</td>
        <td>${escapeHtml(record.submitTime)}</td>
        <td>${escapeHtml(record.name)}</td>
        <td class="link-cell"><a href="${escapeHtml(record.link)}" target="_blank">查看牌谱</a></td>
        <td class="note-cell">${record.note ? escapeHtml(record.note) : '-'}</td>
        <td>${nagaStatus}</td>
        <td class="link-cell">${nagaLinkDisplay}</td>
        <td class="note-cell">${nagaNoteDisplay}</td>
        <td>${imagesDisplay}</td>
      </tr>
    `;
  }).join('');
}

// 显示图片模态框
function showImages(images) {
  const modal = document.getElementById('imageModal');
  const modalImages = document.getElementById('modalImages');

  modalImages.innerHTML = images.map(img => `
    <img src="${img}" alt="图片">
  `).join('');

  modal.style.display = 'block';
}

// 初始化模态框
function initModal() {
  const modal = document.getElementById('imageModal');
  const closeBtn = modal.querySelector('.close');

  closeBtn.onclick = () => {
    modal.style.display = 'none';
  };

  window.onclick = (event) => {
    if (event.target === modal) {
      modal.style.display = 'none';
    }
  };
}

// HTML 转义函数
function escapeHtml(text) {
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}

// 排序表格
function sortTable(field) {
  // 如果点击同一列，切换排序方向
  if (currentSortField === field) {
    currentSortOrder = currentSortOrder === 'asc' ? 'desc' : 'asc';
  } else {
    currentSortField = field;
    currentSortOrder = 'asc';
  }

  // 复制数组进行排序
  const sortedRecords = [...currentRecords];

  sortedRecords.sort((a, b) => {
    let valueA, valueB;

    switch(field) {
      case 'id':
        valueA = a.id;
        valueB = b.id;
        break;
      case 'submitTime':
        valueA = a.submitTime;
        valueB = b.submitTime;
        break;
      case 'name':
        valueA = a.name.toLowerCase();
        valueB = b.name.toLowerCase();
        break;
      case 'hasNaga':
        valueA = (a.nagaLink && a.nagaLink.trim() !== '') ? 1 : 0;
        valueB = (b.nagaLink && b.nagaLink.trim() !== '') ? 1 : 0;
        break;
      default:
        return 0;
    }

    if (valueA < valueB) {
      return currentSortOrder === 'asc' ? -1 : 1;
    }
    if (valueA > valueB) {
      return currentSortOrder === 'asc' ? 1 : -1;
    }
    return 0;
  });

  renderTable(sortedRecords);
  updateSortIcons();
}

// 更新排序图标
function updateSortIcons() {
  // 移除所有排序图标的激活状态
  document.querySelectorAll('.sort-icon').forEach(icon => {
    icon.textContent = '⇅';
    icon.classList.remove('sort-asc', 'sort-desc');
  });

  // 如果有当前排序字段，更新对应图标
  if (currentSortField) {
    const headers = document.querySelectorAll('th.sortable');
    headers.forEach(th => {
      const onclick = th.getAttribute('onclick');
      if (onclick && onclick.includes(`'${currentSortField}'`)) {
        const icon = th.querySelector('.sort-icon');
        if (icon) {
          icon.textContent = currentSortOrder === 'asc' ? '↑' : '↓';
          icon.classList.add(currentSortOrder === 'asc' ? 'sort-asc' : 'sort-desc');
        }
      }
    });
  }
}