/**
 * 知资札记 - C端前端逻辑
 * 证券投资图文存档站
 */
(function () {
  'use strict';

  // ── 常量 ──
  const API_BASE = '/api/zhizi_notes';
  const STORAGE_KEY = 'zhizi_notes_theme';
  const STORAGE_VIEW = 'zhizi_notes_view';
  const STORAGE_FAVORITES = 'zhizi_notes_favorites';

  // ── 状态 ──
  let state = {
    page: 1,
    pageSize: 12,
    totalPages: 0,
    loading: false,
    done: false,
    viewMode: localStorage.getItem(STORAGE_VIEW) || 'card',
    filter: { category: '', tag: '', timeRange: '', contentType: '', search: '' },
    favorites: new Set()
  };

  // ── DOM 缓存 ──
  const $ = (sel) => document.querySelector(sel);
  const $$ = (sel) => document.querySelectorAll(sel);

  // ── 链接清洗函数 ──
  window.clearAllLink = function (htmlStr) {
    if (!htmlStr || typeof htmlStr !== 'string') return '';
    return htmlStr.replace(/<a\b[^>]*>(.*?)<\/a>/gi, '$1');
  };

  // ── Toast 提示 ──
  function showToast(msg, type) {
    type = type || 'info';
    const t = $('#zs-toast');
    if (!t) return;
    t.textContent = msg;
    t.className = 'zs-toast ' + type + ' show';
    const duration = type === 'error' ? 4000 : 2000;
    clearTimeout(t._timer);
    t._timer = setTimeout(function () { t.classList.remove('show'); }, duration);
  }

  // ── 暗黑模式 ──
  function initTheme() {
    const saved = localStorage.getItem(STORAGE_KEY);
    if (saved === 'dark') {
      document.documentElement.setAttribute('data-theme', 'dark');
    }
    const btn = $('#zs-theme-btn');
    if (btn) {
      btn.textContent = saved === 'dark' ? '☀️' : '🌙';
      btn.addEventListener('click', toggleTheme);
    }
  }

  function toggleTheme() {
    const isDark = document.documentElement.getAttribute('data-theme') === 'dark';
    if (isDark) {
      document.documentElement.removeAttribute('data-theme');
      localStorage.setItem(STORAGE_KEY, 'light');
      $('#zs-theme-btn').textContent = '🌙';
    } else {
      document.documentElement.setAttribute('data-theme', 'dark');
      localStorage.setItem(STORAGE_KEY, 'dark');
      $('#zs-theme-btn').textContent = '☀️';
    }
  }

  // ── API 请求 ──
  async function apiGet(path) {
    try {
      const res = await fetch(API_BASE + path, { credentials: 'same-origin' });
      return await res.json();
    } catch (e) {
      return { ok: false, error: e.message };
    }
  }

  async function apiPost(path, body) {
    try {
      const res = await fetch(API_BASE + path, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'same-origin',
        body: JSON.stringify(body)
      });
      return await res.json();
    } catch (e) {
      return { ok: false, error: e.message };
    }
  }

  // ── 加载文章列表 ──
  async function loadArticles(reset) {
    if (reset) {
      state.page = 1; state.done = false;
      const grid = $('#zs-card-grid');
      if (grid) grid.innerHTML = '';
    }
    if (state.loading || state.done) return;
    state.loading = true;
    showLoading(true);

    const params = new URLSearchParams();
    params.set('page', state.page);
    params.set('pageSize', state.pageSize);
    if (state.filter.category) params.set('category', state.filter.category);
    if (state.filter.tag) params.set('tag', state.filter.tag);
    if (state.filter.timeRange) params.set('timeRange', state.filter.timeRange);
    if (state.filter.contentType) params.set('contentType', state.filter.contentType);
    if (state.filter.search) params.set('search', state.filter.search);

    const data = await apiGet('/articles?' + params.toString());
    showLoading(false);
    state.loading = false;

    if (!data.ok) {
      showToast('加载失败：' + (data.error || '未知错误'), 'error');
      return;
    }

    const articles = data.data || [];
    const pag = data.pagination || {};
    state.totalPages = pag.totalPages || 0;
    if (state.page >= state.totalPages) state.done = true;
    if (articles.length === 0 && state.page === 1) {
      showEmpty(true);
    } else {
      showEmpty(false);
      renderCards(articles);
      state.page++;
    }
  }

  function showLoading(show) {
    const el = $('#zs-loading');
    if (el) el.style.display = show ? 'block' : 'none';
  }

  function showEmpty(show) {
    const el = $('#zs-empty');
    if (el) el.style.display = show ? 'block' : 'none';
  }

  // ── 渲染卡片 ──
  function renderCards(articles) {
    const grid = $('#zs-card-grid');
    if (!grid) return;
    articles.forEach(function (article) {
      const card = createCard(article);
      grid.appendChild(card);
    });
    lazyLoadImages();
  }

  function createCard(article) {
    const card = document.createElement('div');
    card.className = 'zs-card';
    card.setAttribute('data-id', article.id);
    card.addEventListener('click', function (e) {
      if (e.target.closest('.fav-btn')) return;
      openDetail(article.id);
    });

    // 封面区
    const cover = document.createElement('div');
    cover.className = 'card-cover';
    if (article.cover_url) {
      const img = document.createElement('img');
      img.setAttribute('data-src', article.cover_url);
      img.setAttribute('alt', article.title);
      img.className = 'lazy-img';
      cover.appendChild(img);
    } else {
      const badge = document.createElement('div');
      badge.className = 'text-badge';
      badge.textContent = '文';
      cover.appendChild(badge);
    }

    // 角标
    const imgCount = article.image_count || 0;
    const badge = document.createElement('span');
    badge.className = 'card-badge';
    badge.textContent = article.content_type === 'image' ? '含' + imgCount + '张附图' : '纯文字';
    cover.appendChild(badge);

    // 正文区
    const body = document.createElement('div');
    body.className = 'card-body';

    const title = document.createElement('div');
    title.className = 'card-title';
    title.textContent = article.title;

    const source = document.createElement('div');
    source.className = 'card-source';
    source.textContent = article.source || '';

    // 标签
    const tagsRow = document.createElement('div');
    tagsRow.className = 'card-tags';
    try {
      const tags = JSON.parse(article.tags_json || '[]');
      tags.forEach(function (t) {
        const span = document.createElement('span');
        span.className = 'card-tag';
        span.textContent = t;
        tagsRow.appendChild(span);
      });
    } catch (e) {}

    // 底部
    const footer = document.createElement('div');
    footer.className = 'card-footer';

    const meta = document.createElement('span');
    meta.textContent = (article.created_at || '').slice(0, 10) + ' · ' + (article.views || 0) + ' 阅读';

    const favBtn = document.createElement('button');
    favBtn.className = 'fav-btn';
    favBtn.setAttribute('data-id', article.id);
    favBtn.title = '收藏';
    if (state.favorites.has(article.id)) {
      favBtn.classList.add('favorited');
      favBtn.textContent = '♥';
    } else {
      favBtn.textContent = '♡';
    }
    favBtn.addEventListener('click', function (e) { e.stopPropagation(); toggleFavorite(article.id, favBtn); });

    footer.appendChild(meta);
    footer.appendChild(favBtn);

    body.appendChild(title);
    body.appendChild(source);
    body.appendChild(tagsRow);
    body.appendChild(footer);

    card.appendChild(cover);
    card.appendChild(body);
    return card;
  }

  // ── 图片懒加载 ──
  function lazyLoadImages() {
    const imgs = document.querySelectorAll('img.lazy-img[data-src]');
    if (!('IntersectionObserver' in window)) {
      imgs.forEach(function (img) { img.src = img.getAttribute('data-src'); img.removeAttribute('data-src'); });
      return;
    }
    const observer = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (entry.isIntersecting) {
          const img = entry.target;
          img.src = img.getAttribute('data-src');
          img.removeAttribute('data-src');
          img.classList.remove('lazy-img');
          observer.unobserve(img);
        }
      });
    }, { rootMargin: '100px' });
    imgs.forEach(function (img) { observer.observe(img); });
  }

  // ── 滚动触底加载 ──
  let scrollTimer = null;
  function onScroll() {
    if (scrollTimer) return;
    scrollTimer = setTimeout(function () {
      scrollTimer = null;
      if (state.loading || state.done) return;
      const scrollY = window.scrollY + window.innerHeight;
      const docH = document.documentElement.scrollHeight;
      if (scrollY >= docH - 300) loadArticles(false);
    }, 200);
  }

  // ── 收藏切换 ──
  async function toggleFavorite(articleId, btn) {
    if (btn._pending) return;
    btn._pending = true;
    btn.style.opacity = '0.5';
    try {
      const data = await apiPost('/articles/' + articleId + '/toggle_favorite', {});
      if (data.ok) {
        if (data.data && data.data.favorited) {
          state.favorites.add(articleId);
          btn.classList.add('favorited');
          btn.textContent = '♥';
          showToast('已收藏', 'success');
        } else {
          state.favorites.delete(articleId);
          btn.classList.remove('favorited');
          btn.textContent = '♡';
          showToast('已取消收藏', 'info');
        }
      } else {
        showToast('操作失败：' + (data.error || '未知错误'), 'error');
      }
    } catch (e) {
      showToast('网络错误', 'error');
    }
    btn._pending = false;
    btn.style.opacity = '1';
  }

  // ── 打开详情页 ──
  function openDetail(id) {
    window.open('/tools/zhizi_notes/detail.html?id=' + id, '_blank');
  }

  // ── 筛选逻辑 ──
  function setFilter(key, value) {
    if (key === 'category') {
      if (state.filter.category === value) value = '';
    } else if (key === 'tag') {
      if (state.filter.tag === value) value = '';
    } else if (key === 'timeRange') {
      if (state.filter.timeRange === value) value = '';
    } else if (key === 'contentType') {
      if (state.filter.contentType === value) value = '';
    }
    state.filter[key] = value;
    updateFilterUI();
    loadArticles(true);
  }

  function setSearch(value) {
    state.filter.search = value;
    loadArticles(true);
  }

  function updateFilterUI() {
    // 分类
    $$('.zs-sidebar .cat-item').forEach(function (el) {
      var cat = el.getAttribute('data-cat');
      el.classList.toggle('active', cat === state.filter.category);
    });
    // 标签
    $$('.zs-sidebar .tag-item').forEach(function (el) {
      var tag = el.getAttribute('data-tag');
      el.classList.toggle('active', tag === state.filter.tag);
    });
    // 时间
    $$('.zs-sidebar .time-item').forEach(function (el) {
      var tr = el.getAttribute('data-time');
      el.classList.toggle('active', tr === state.filter.timeRange);
    });
    // 图文类型
    $$('.zs-sidebar .type-btn').forEach(function (el) {
      var ct = el.getAttribute('data-type');
      el.classList.toggle('active', ct === state.filter.contentType);
    });
    // 筛选标签显示
    renderFilterTags();
  }

  function renderFilterTags() {
    var container = $('#zs-filter-tags');
    if (!container) return;
    container.innerHTML = '';
    var items = [];
    if (state.filter.category) items.push({ label: state.filter.category, key: 'category' });
    if (state.filter.tag) items.push({ label: state.filter.tag, key: 'tag' });
    if (state.filter.timeRange) {
      var labels = { week: '本周', month: '本月', quarter: '本季度' };
      items.push({ label: labels[state.filter.timeRange] || state.filter.timeRange, key: 'timeRange' });
    }
    if (state.filter.contentType) {
      items.push({ label: state.filter.contentType === 'text' ? '纯文字' : '图文多图', key: 'contentType' });
    }
    items.forEach(function (item) {
      var span = document.createElement('span');
      span.className = 'filter-tag';
      span.textContent = item.label;
      var rm = document.createElement('button');
      rm.className = 'remove-filter';
      rm.textContent = '×';
      rm.addEventListener('click', function () { setFilter(item.key, ''); });
      span.appendChild(rm);
      container.appendChild(span);
    });
  }

  // ── 视图切换 ──
  function setViewMode(mode) {
    state.viewMode = mode;
    localStorage.setItem(STORAGE_VIEW, mode);
    var grid = $('#zs-card-grid');
    if (grid) grid.className = mode === 'list' ? 'card-grid list-view' : 'card-grid';
    $$('.zs-main .view-toggle button').forEach(function (btn) {
      btn.classList.toggle('active', btn.getAttribute('data-view') === mode);
    });
  }

  // ── 加载右侧栏 ──
  async function loadRightbar() {
    // 置顶
    try {
      var pinned = await apiGet('/articles/pinned');
      var pinnedContainer = $('#zs-pinned');
      if (pinnedContainer && pinned.ok && pinned.data) {
        pinnedContainer.innerHTML = '';
        pinned.data.forEach(function (a) {
          var div = document.createElement('div');
          div.className = 'pinned-item';
          div.innerHTML = '<div class="pinned-title">' + escapeHtml(a.title) + '</div><div class="pinned-date">' + (a.created_at || '').slice(0, 10) + '</div>';
          div.addEventListener('click', function () { openDetail(a.id); });
          pinnedContainer.appendChild(div);
        });
      }
    } catch (e) {}

    // 最新
    try {
      var latest = await apiGet('/articles/latest');
      var latestContainer = $('#zs-latest');
      if (latestContainer && latest.ok && latest.data) {
        latestContainer.innerHTML = '';
        latest.data.forEach(function (a) {
          var div = document.createElement('div');
          div.className = 'latest-item';
          div.textContent = a.title;
          div.addEventListener('click', function () { openDetail(a.id); });
          latestContainer.appendChild(div);
        });
      }
    } catch (e) {}

    // 统计数据
    try {
      var stats = await apiGet('/stats');
      if (stats.ok && stats.data) {
        var totalArticles = $('#zs-stat-articles');
        var totalImages = $('#zs-stat-images');
        if (totalArticles) totalArticles.textContent = stats.data.totalArticles || 0;
        if (totalImages) totalImages.textContent = stats.data.totalImages || 0;
        // 分类占比
        var chartContainer = $('#zs-chart');
        if (chartContainer && stats.data.catStats) {
          var maxCount = Math.max.apply(null, stats.data.catStats.map(function (c) { return c.c; }));
          chartContainer.innerHTML = '';
          stats.data.catStats.forEach(function (c) {
            var pct = maxCount > 0 ? Math.round((c.c / maxCount) * 100) : 0;
            var row = document.createElement('div');
            row.className = 'chart-bar';
            row.innerHTML = '<span class="bar-label">' + escapeHtml(c.category) + '</span>' +
              '<span class="bar-track"><span class="bar-fill" style="width:' + pct + '%"></span></span>' +
              '<span class="bar-count">' + c.c + '</span>';
            chartContainer.appendChild(row);
          });
        }
      }
    } catch (e) {}
  }

  function escapeHtml(str) {
    if (!str) return '';
    return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
  }

  // ── 加载分类/标签 ──
  async function loadSidebarFilters() {
    // 分类
    try {
      var cats = await apiGet('/categories');
      var catContainer = $('#zs-categories');
      if (catContainer && cats.ok && cats.data) {
        catContainer.innerHTML = '';
        cats.data.forEach(function (c) {
          var btn = document.createElement('button');
          btn.className = 'cat-item';
          btn.setAttribute('data-cat', c.name);
          btn.textContent = c.name;
          btn.addEventListener('click', function () { setFilter('category', c.name); });
          catContainer.appendChild(btn);
        });
      }
    } catch (e) {}

    // 标签
    try {
      var tags = await apiGet('/tags');
      var tagContainer = $('#zs-tags');
      if (tagContainer && tags.ok && tags.data) {
        tagContainer.innerHTML = '';
        tags.data.forEach(function (t) {
          var btn = document.createElement('button');
          btn.className = 'tag-item';
          btn.setAttribute('data-tag', t.name);
          btn.textContent = t.name + '(' + (t.article_count || 0) + ')';
          btn.addEventListener('click', function () { setFilter('tag', t.name); });
          tagContainer.appendChild(btn);
        });
      }
    } catch (e) {}
  }

  // ── 加载收藏状态 ──
  async function loadFavorites() {
    try {
      var data = await apiGet('/favorites');
      if (data.ok && data.data) {
        state.favorites = new Set();
        data.data.forEach(function (a) { state.favorites.add(a.id); });
      }
    } catch (e) {}
  }

  // ── 初始化 ──
  function init() {
    initTheme();

    // 视图切换
    setViewMode(state.viewMode);
    $$('.zs-main .view-toggle button').forEach(function (btn) {
      btn.addEventListener('click', function () { setViewMode(btn.getAttribute('data-view')); });
    });

    // 分类筛选
    $$('.zs-sidebar .cat-item').forEach(function (btn) {
      btn.addEventListener('click', function () { setFilter('category', btn.getAttribute('data-cat')); });
    });

    // 标签筛选
    // (动态生成的，在 loadSidebarFilters 中绑定)

    // 时间筛选
    $$('.zs-sidebar .time-item').forEach(function (btn) {
      btn.addEventListener('click', function () { setFilter('timeRange', btn.getAttribute('data-time')); });
    });

    // 图文类型筛选
    $$('.zs-sidebar .type-btn').forEach(function (btn) {
      btn.addEventListener('click', function () { setFilter('contentType', btn.getAttribute('data-type')); });
    });

    // 搜索
    var searchInput = $('#zs-search');
    var searchBtn = $('#zs-search-btn');
    if (searchBtn && searchInput) {
      searchBtn.addEventListener('click', function () { setSearch(searchInput.value.trim()); });
      searchInput.addEventListener('keydown', function (e) { if (e.key === 'Enter') setSearch(searchInput.value.trim()); });
    }

    // 滚动加载
    window.addEventListener('scroll', onScroll, { passive: true });

    // 汉堡菜单
    var hamburger = $('#zs-hamburger');
    var sidebar = $('#zs-sidebar');
    var overlay = $('#zs-sidebar-overlay');
    if (hamburger && sidebar) {
      hamburger.addEventListener('click', function () {
        var open = sidebar.classList.contains('open');
        if (open) {
          sidebar.classList.remove('open');
          if (overlay) overlay.classList.remove('show');
        } else {
          sidebar.classList.add('open');
          if (overlay) overlay.classList.add('show');
        }
      });
      if (overlay) {
        overlay.addEventListener('click', function () {
          sidebar.classList.remove('open');
          overlay.classList.remove('show');
        });
      }
    }

    // 提交存档按钮
    var submitBtn = $('#zs-submit-btn');
    if (submitBtn) {
      submitBtn.addEventListener('click', function () {
        window.open('/tools/zhizi_notes/admin.html', '_blank');
      });
    }

    // 初始加载
    loadSidebarFilters();
    loadFavorites().then(function () { loadArticles(true); });
    loadRightbar();
  }

  // ── 启动 ──
  document.addEventListener('DOMContentLoaded', init);
})();