'use strict';

(function () {
  const ICON_DOWNLOAD = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 3v12"/><path d="M7 10l5 5 5-5"/><path d="M4 21h16"/></svg>';

  function esc(value) {
    const div = document.createElement('div');
    div.textContent = String(value ?? '');
    return div.innerHTML;
  }

  const state = {
    initialized: false,
    loading: false,
    root: '',
    items: [],
    filter: 'all',
    keyword: '',
  };

  const FILTER_LABELS = {
    logo: 'LOGO',
    banner: '海报',
    signage: '招牌',
    sticker: '贴纸',
    dish: '菜品',
    other: '其他',
  };

  function formatBytes(size) {
    if (!Number.isFinite(size) || size <= 0) return '—';
    if (size < 1024 * 1024) return `${Math.round(size / 1024)} KB`;
    return `${(size / 1024 / 1024).toFixed(1)} MB`;
  }

  function formatTime(value) {
    if (!value) return '';
    const date = new Date(value);
    const pad = (n) => String(n).padStart(2, '0');
    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}`;
  }

  function getFilteredItems() {
    const keyword = state.keyword.trim().toLowerCase();
    return state.items.filter((item) => {
      if (state.filter !== 'all' && item.kind !== state.filter) return false;
      if (!keyword) return true;
      return `${item.shopName} ${item.name} ${item.fileName}`.toLowerCase().includes(keyword);
    });
  }

  function renderSummary() {
    const summary = document.getElementById('historySummary');
    const filtered = getFilteredItems();
    if (state.loading) {
      summary.textContent = '正在加载历史作品…';
      return;
    }
    summary.textContent = state.items.length
      ? `共 ${state.items.length} 件作品 · 当前显示 ${filtered.length} 件`
      : '暂无历史作品';
  }

  function renderGallery() {
    const gallery = document.getElementById('historyGallery');
    const items = getFilteredItems();
    gallery.classList.toggle('empty', items.length === 0);
    if (!items.length) {
      gallery.innerHTML = `
        <div class="history-empty">
          <div class="history-empty-icon">
            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="4" width="18" height="16" rx="3"/><circle cx="9" cy="10" r="1.8"/><path d="M21 16l-5-5-6 6"/></svg>
          </div>
          <p>${state.loading ? '正在加载作品' : '暂无匹配的历史作品'}</p>
          <small>${state.loading ? '请稍候' : '生成完成的作品会自动出现在这里'}</small>
        </div>`;
      return;
    }
    gallery.innerHTML = '';
    items.forEach((item) => {
      const card = document.createElement('figure');
      card.className = 'creation-card';
      card.dataset.kind = item.kind;

      const frame = document.createElement('div');
      frame.className = 'creation-frame';
      if (item.kind === 'sticker') frame.classList.add('transparent-bg');
      const image = document.createElement('img');
      image.src = item.url;
      image.alt = `${item.shopName} ${item.name}`;
      image.loading = 'lazy';
      frame.appendChild(image);
      window.shanHoverZoom(frame, image.src, item.kind === 'sticker');

      const kind = document.createElement('span');
      kind.className = 'creation-kind';
      kind.textContent = FILTER_LABELS[item.kind] || '其他';
      frame.appendChild(kind);

      const download = document.createElement('a');
      download.className = 'result-download-icon';
      download.href = item.url;
      download.download = '';
      download.title = '下载原图';
      download.setAttribute('aria-label', '下载原图');
      download.innerHTML = ICON_DOWNLOAD;
      frame.appendChild(download);

      const caption = document.createElement('figcaption');
      const title = document.createElement('div');
      title.className = 'creation-title';
      title.title = item.name;
      title.textContent = item.name;
      const shop = document.createElement('div');
      shop.className = 'creation-shop';
      shop.title = item.shopName;
      shop.textContent = item.shopName;
      const meta = document.createElement('div');
      meta.className = 'creation-meta';
      meta.textContent = `${formatTime(item.modifiedAt)} · ${formatBytes(item.fileSizeBytes)}`;
      caption.append(title, shop, meta);

      card.append(frame, caption);
      gallery.appendChild(card);
    });
  }

  function render() {
    renderSummary();
    renderGallery();
  }

  async function loadHistory() {
    if (state.loading) return;
    state.loading = true;
    render();
    try {
      const rootResponse = await fetch('/api/default-root');
      const rootData = await rootResponse.json();
      state.root = rootData.root;
      const response = await fetch(`/api/creations?root=${encodeURIComponent(state.root)}&limit=600`);
      const data = await response.json();
      if (!response.ok) throw new Error(data.error || '历史作品加载失败');
      state.items = data.items || [];
    } catch (error) {
      state.items = [];
      renderGallery();
      document.getElementById('historySummary').textContent = error.message;
    } finally {
      state.loading = false;
      render();
    }
  }

  function bindEvents() {
    document.getElementById('btnRefreshHistory').addEventListener('click', loadHistory);
    document.getElementById('historySearch').addEventListener('input', (event) => {
      state.keyword = event.target.value;
      render();
    });
    document.getElementById('historyFilters').addEventListener('click', (event) => {
      const button = event.target.closest('[data-filter]');
      if (!button) return;
      state.filter = button.dataset.filter;
      document.querySelectorAll('#historyFilters .history-filter').forEach((item) => {
        item.classList.toggle('active', item === button);
      });
      render();
    });
  }

  window.shanHistoryInit = function () {
    if (!state.initialized) {
      state.initialized = true;
      bindEvents();
    }
    loadHistory();
  };
})();