/* 11-02 首页「孕妈广场」效果稿 V4 · 故事卡堆（翻一翻）
   一叠微微错开的真实照片卡，左右拖/轻扫/点箭头翻页，最后一张是「轮到你了」投稿卡；下方一行 #话题 入口。
   只在 ?gcv=4 时由 index.html 加载；笔记是从 guangchang/data.js 摘的精选（占位示例）。 */
(function () {
  var sec = document.getElementById('gcHome'), T = window.GC_TOPICS;
  if (!sec || !Array.isArray(T) || !T.length) return;
  function init() {
  var esc = function (s) { return String(s == null ? '' : s).replace(/[&<>"]/g, function (c) { return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]; }); };
  var kfmt = function (n) { return n >= 10000 ? (n / 10000).toFixed(1).replace(/\.0$/, '') + '万' : n >= 1000 ? (n / 1000).toFixed(1).replace(/\.0$/, '') + 'k' : String(n); };
  var ava = function (n) { return 'assets/img/mom/' + n + '.jpg'; };
  var reduce = window.matchMedia && matchMedia('(prefers-reduced-motion: reduce)').matches;
  var CAT_CN = { family: '家庭婚姻', work: '职场', baby: '经验' };
  var TOP = {}; T.forEach(function (t) { TOP[t.id] = t; });
  /* 11-02 用户：广场帖子跟「其他妈妈也在搜」一样按孕周 6 段走 —— 多数是同阶段孕妈的帖子，穿插过来人（已生完）的。
     帖子清单在 guangchang/feed.js（由 data.js 生成的轻量索引 + 排序函数 GC_ORDER），孕周取 app.js 广播的 window.__mbPreg。 */
  var MOMS = ['m03', 'p02', 'm07', 'p05', 'm11', 'p09', 'm14', 'm16', 'p12', 'm19', 'm21', 'p07'];
  function userBand() {
    var pg = window.__mbPreg || {};
    return pg.postpartum ? 'pp' : (pg.week && window.GC_BAND ? window.GC_BAND('孕' + pg.week + '周') : -1);
  }
  function notes(cat) {
    if (!window.GC_ORDER) return [];
    var F = window.GC_FEED || [], ub = userBand();
    var l = window.GC_ORDER(F.filter(function (n) { return n.photo && (!cat || (TOP[n.t] || {}).cat === cat); }), ub);
    if (!cat) {   /* 「全部」：同一分类最多 3 张，三类穿插着来 */
      var cnt = {}, out = [];
      l.forEach(function (n) { var c = (TOP[n.t] || {}).cat; if (out.length < 7 && (cnt[c] || 0) < 3) { cnt[c] = (cnt[c] || 0) + 1; out.push(n); } });
      l = out;
    }
    return l.slice(0, 7).map(function (n, i) { return { t: n.t, id: n.id, title: n.title, author: n.author, stage: n.stage, likes: n.likes, photo: n.photo, av: MOMS[(i * 5 + (cat ? cat.length : 0)) % MOMS.length] }; });
  }
  function topics(cat) {
    var l = T.filter(function (t) { return !cat || t.cat === cat; });
    var hot = l.filter(function (t) { return t.hot; });
    return (cat ? hot : hot.filter(function (_, i) { return i % 3 === 0; })).concat(l.filter(function (t) { return !t.hot; })).slice(0, 3);
  }
  /* 11-02 用户：「进广场首页太深，只能点详情再返回」→ 点帖子只带 ?n=（返回落在广场首页，不落在单个话题）；话题标签才带 ?t= */
  function go(id, nid) {
    location.href = 'guangchang/' + (nid ? '?n=' + encodeURIComponent(nid) : id ? '?t=' + encodeURIComponent(id) : '') + location.hash;
  }

  sec.className = sec.className.replace(/\bgv\d\b/g, '') + ' gv4';
  sec.innerHTML =
    '<div class="g4-head"><h2 class="g4-title"><span>孕妈广场</span></h2>' +
    '<span class="g4-cat" role="tablist" aria-label="话题分类"><button type="button" class="on" data-cat="">全部</button><button type="button" data-cat="family">家庭婚姻</button><button type="button" data-cat="work">职场</button><button type="button" data-cat="baby">经验</button></span></div>' +
    /* 11-02 用户：「逛广场」单独挂在右边突兀 → 整行做成入口条（浅粉底，整条可点），右侧实心「进广场」 */
    '<div class="g4-sub" role="button" tabindex="0"><span class="g4-avs" aria-hidden="true">' + ['p05', 'm07', 'p11', 'm16'].map(function (n) { return '<img src="' + ava(n) + '" alt="" loading="lazy">'; }).join('') + '</span><span class="g4-st">翻一翻，看看<b>其他妈妈</b>的故事</span><span class="g4-in">进广场<i>›</i></span></div>' +
    '<div class="g4-stage"><div class="g4-deck" aria-live="polite"></div>' +
    '<div class="g4-rail"><span class="g4-pg"><b>1</b><i>/8</i></span>' +
    '<button type="button" class="g4-arr prev" aria-label="上一张">‹</button><button type="button" class="g4-arr next" aria-label="下一张">›</button></div></div>' +
    '<div class="g4-tags"></div>' +
    '<div class="g4-foot"><button type="button" class="g4-all">进孕妈广场 ›</button><span class="g4-mark">效果稿 V4</span></div>';
  sec.classList.remove('hide');

  var deck = sec.querySelector('.g4-deck'), pgB = sec.querySelector('.g4-pg b'), pgI = sec.querySelector('.g4-pg i'), tags = sec.querySelector('.g4-tags');
  var cards = [], idx = 0, cur = '';

  function storyCard(n) {
    var tp = TOP[n.t] || {}, cat = tp.cat || 'family';
    return '<div class="g4-card st c-' + cat + '" data-t="' + esc(n.t) + '" data-n="' + esc(n.id) + '" role="button" tabindex="0">' +
      '<img class="g4-ph" src="' + esc(n.photo) + '" alt="" loading="lazy" decoding="async" draggable="false">' +
      '<span class="g4-k">' + CAT_CN[cat] + '</span>' +
      '<span class="g4-bot"><b class="g4-tt">' + esc(n.title) + '</b>' +
      '<span class="g4-by"><img src="' + ava(n.av) + '" alt="" loading="lazy" draggable="false"><em>' + esc(n.author) + '</em><i>' + esc(n.stage) + '</i>' +
      '<span class="g4-like"><svg viewBox="0 0 24 24" aria-hidden="true"><path d="M12 20.5s-7.5-4.6-7.5-10.2A4.3 4.3 0 0112 7.6a4.3 4.3 0 017.5 2.7c0 5.6-7.5 10.2-7.5 10.2z"/></svg>' + kfmt(n.likes) + '</span></span></span></div>';
  }
  function submitCard() {
    return '<div class="g4-card sub" data-sub="1" role="button" tabindex="0">' +
      '<span class="g4-s-k">兜爸心选 · 官方征集</span>' +   /* 11-02 品牌露出 */
      '<b class="g4-s-t">轮到你了</b>' +
      '<span class="g4-s-d">你的孕期故事，正是别的妈妈想听的</span>' +
      '<span class="g4-s-r"><span><b>¥30</b><i>现金</i></span><em>+</em><span><b>500</b><i>兜豆</i></span></span>' +
      '<span class="g4-s-n">被选中即可获得</span>' +
      '<span class="g4-s-go">去投稿 ›</span>' +
      '<span class="g4-s-avs" aria-hidden="true">' + ['m02', 'p04', 'm09', 'p13', 'm18'].map(function (n) { return '<img src="' + ava(n) + '" alt="" loading="lazy" draggable="false">'; }).join('') + '<i>本周已有 326 位妈妈投稿</i></span></div>';
  }
  function paint(cat, first) {
    cur = cat; idx = 0;
    deck.innerHTML = notes(cat).map(storyCard).join('') + submitCard();
    cards = [].slice.call(deck.children);
    if (!first && !reduce) {
      deck.classList.add('deal');
      cards.forEach(function (c, i) { c.style.transitionDelay = (Math.min(i, 3) * 60) + 'ms'; });
      layout();
      requestAnimationFrame(function () { requestAnimationFrame(function () { deck.classList.remove('deal'); layout(); setTimeout(function () { cards.forEach(function (c) { c.style.transitionDelay = ''; }); }, 500); }); });
    } else layout();
    tags.innerHTML = '<span class="g4-tl">大家在聊</span>' + topics(cat).map(function (t) { return '<button type="button" data-t="' + esc(t.id) + '">#' + esc(t.name) + '#</button>'; }).join('');
    tags.scrollLeft = 0;
  }
  /* depth：0 顶层；1、2 在后面错开；>2 藏在后面；<0 已翻走（左侧飞出） */
  function layout() {
    cards.forEach(function (c, i) {
      var d = i - idx;
      c.setAttribute('data-d', d < 0 ? 'out' : d > 3 ? 3 : d);
      c.style.zIndex = 20 - Math.abs(d);
      c.style.transform = '';
      c.setAttribute('aria-hidden', d === 0 ? 'false' : 'true');
      c.tabIndex = d === 0 ? 0 : -1;
    });
    pgB.textContent = idx + 1; pgI.textContent = '/' + cards.length;
    /* 11-02 用户：滑到哪张图，右上角分类小滑块跟着跳到它的归属类（只在「全部」里跳；投稿卡回到「全部」；选了具体分类时不动） */
    if (cur === '') {
      var cc = cards[idx] && (cards[idx].className.match(/\bc-(\w+)/) || [])[1] || '';
      [].forEach.call(sec.querySelectorAll('.g4-cat button'), function (x) { x.classList.toggle('on', x.dataset.cat === cc); });
    }
    sec.querySelector('.g4-arr.prev').disabled = idx === 0;
  }
  function next() {
    if (idx < cards.length - 1) { idx++; layout(); return; }
    /* 最后一张再往后 → 整叠收回，从第 1 张重新开始 */
    idx = 0; deck.classList.add('reset'); layout();
    setTimeout(function () { deck.classList.remove('reset'); }, 380);
  }
  function prev() { if (idx > 0) { idx--; layout(); } else bounce(1); }
  function bounce(dir) {
    var c = cards[idx]; if (!c || reduce) return;
    c.style.transform = 'translateX(' + dir * 14 + 'px) rotate(' + dir * 1.5 + 'deg)';
    setTimeout(function () { c.style.transform = ''; }, 160);
  }

  /* 拖动：方向锁 —— 先判断横 / 竖，竖向直接放行给页面滚动，横向才拦截（touchmove passive:false 才能 preventDefault） */
  var drag = null, moved = false;
  function start(x, y) { var c = cards[idx]; if (!c) return; drag = { x: x, y: y, dx: 0, lock: '', t: Date.now(), c: c }; moved = false; }
  function move(x, y, e) {
    if (!drag) return;
    var dx = x - drag.x, dy = y - drag.y;
    if (!drag.lock) {
      if (Math.abs(dx) < 6 && Math.abs(dy) < 6) return;
      drag.lock = Math.abs(dx) > Math.abs(dy) ? 'x' : 'y';
      if (drag.lock === 'y') { drag = null; return; }
      drag.c.classList.add('drag'); deck.classList.add('dragging');
    }
    if (e && e.cancelable) e.preventDefault();
    if (e) e.stopPropagation();
    moved = true;
    if ((idx === 0 && dx > 0)) dx = dx * 0.3;   // 第一张往右拖：阻尼
    drag.dx = dx;
    drag.c.style.transform = 'translateX(' + dx + 'px) translateY(' + Math.abs(dx) * 0.04 + 'px) rotate(' + dx / 18 + 'deg)';
  }
  function end() {
    if (!drag) return false;
    var d = drag; drag = null;
    d.c.classList.remove('drag'); deck.classList.remove('dragging');
    if (!d.lock) return false;
    var v = Math.abs(d.dx) / Math.max(1, Date.now() - d.t);
    if (d.dx < -70 || (d.dx < -24 && v > 0.45)) next();
    else if ((d.dx > 70 || (d.dx > 24 && v > 0.45)) && idx > 0) prev();
    else d.c.style.transform = '';
    return true;
  }
  deck.addEventListener('touchstart', function (e) { if (e.touches.length === 1) start(e.touches[0].clientX, e.touches[0].clientY); else drag = null; }, { passive: true });
  deck.addEventListener('touchmove', function (e) { if (drag && e.touches.length === 1) move(e.touches[0].clientX, e.touches[0].clientY, e); }, { passive: false });
  /* 首页在 document 上有「左右滑切底部 tab」的手势（app.js touchend）：卡堆横拖结束时截住 touchend，别让它把页面切走 */
  deck.addEventListener('touchend', function (e) { if (end()) e.stopPropagation(); });
  deck.addEventListener('touchcancel', end);
  deck.addEventListener('mousedown', function (e) {
    if (e.button) return; start(e.clientX, e.clientY); e.preventDefault();
    var mm = function (ev) { move(ev.clientX, ev.clientY, ev); }, mu = function () { end(); document.removeEventListener('mousemove', mm); document.removeEventListener('mouseup', mu); };
    document.addEventListener('mousemove', mm); document.addEventListener('mouseup', mu);
  });
  deck.addEventListener('click', function (e) {
    if (moved) { moved = false; return; }
    var c = e.target.closest('.g4-card');
    if (!c) return;
    if (c !== cards[idx]) { next(); return; }   // 点到后面露出的卡角 → 翻到下一张
    go(c.dataset.sub ? '' : c.dataset.t, c.dataset.sub ? '' : c.dataset.n);
  });
  deck.addEventListener('keydown', function (e) {
    if (e.key === 'ArrowRight') next(); else if (e.key === 'ArrowLeft') prev();
    else if (e.key === 'Enter') { var c = cards[idx]; if (c) go(c.dataset.sub ? '' : c.dataset.t, c.dataset.sub ? '' : c.dataset.n); }
  });
  sec.querySelector('.g4-arr.next').addEventListener('click', next);
  sec.querySelector('.g4-arr.prev').addEventListener('click', prev);
  tags.addEventListener('click', function (e) { var b = e.target.closest('button[data-t]'); if (b) go(b.dataset.t); });
  sec.querySelector('.g4-all').addEventListener('click', function () { go(''); });
  sec.querySelector('.g4-sub').addEventListener('click', function () { go(''); });
  sec.querySelector('.g4-cat').addEventListener('click', function (e) {
    var b = e.target.closest('button[data-cat]');
    if (!b || b.dataset.cat === cur) return;   // 「全部」里滑块跟着卡片跳，所以按当前筛选判断，不按高亮判断
    [].forEach.call(sec.querySelectorAll('.g4-cat button'), function (x) { x.classList.toggle('on', x === b); });
    paint(b.dataset.cat);
  });
  /* 孕周变了（档案里改了 / 孕期数据晚到）→ 段变了才重排，免得翻到一半被打回第 1 张 */
  var lastUB = userBand();
  window.addEventListener('mb-preg', function () { var u = userBand(); if (u !== lastUB) { lastUB = u; paint(cur, true); } });
  paint('', true);
  sec.dispatchEvent(new Event('gc4-ready'));   /* V6 合并版等这个再往里插「其他妈妈也在搜」 */
}
  /* feed.js 首页默认不加载（index.html 只引了 topics.js），这里按需拉一次 */
  if (window.GC_FEED) init();
  else { var fs = document.createElement('script'); fs.src = 'guangchang/feed.js?v=26110239'; fs.onload = fs.onerror = init; document.body.appendChild(fs); }
})();