/* 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;
  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; });
  /* 精选笔记（摘自 guangchang/data.js）：[话题id, 标题, 作者, 孕周, 点赞, 照片] */
  var N = {
    family: [['f01', '怀孕后我妈每天三个电话，第四个是我爸打的', '栗子慢慢', '孕22周', 1286, 'd9d596acde1f'], ['f03', '表姑说我肚子尖肯定是男孩，我回家对着镜子看了半天', '一颗糖糖', '孕24周', 1680, 'ed263579a24d'], ['f04', '我家清淡婆家重口，孕期一桌菜吃出了两种味道', '桃子味汽水', '孕26周', 1940, 'bcfe0afdde7c'], ['f05', '关心太密的时候，我试着给自己留出了一点空间', '夏天的柚子', '孕31周', 1730, 'e2736880c759'], ['f06', '婆婆远在老家，每天给我转发十几条养胎文章', '远方的橙', '孕23周', 1460, 'cbd9db78f705'], ['f07', '我想顺其自然，我妈要我天天躺着保胎，我们僵了一周', '半杯温水', '孕19周', 1390, '9ed29de3419c'], ['f02', '奶奶让我别伸手晾衣服，说会绕脐带，我差点当场反驳', '青柠小满', '孕25周', 1520, '5cc12b5ca19d']],
    work: [['w04', '赶方案到晚上九点，第一次感觉到胎动是在工位上', '七月的汽水', '孕21周', 2410, '6b374c98a040'], ['w01', '孕 11 周还没告诉领导，周会上差点没忍住吐出来', '青柠半杯', '孕16周', 1862, '874abee3d741'], ['w02', '第一次请产检假，我在领导门口来回走了三趟', '芋圆奶冻', '孕19周', 1544, '41ceb30d229a'], ['w03', '孕 20 周，会议室的椅子让我第一次意识到这件事', '半糖布丁', '孕24周', 1398, '0eb3d4ebc595'], ['w05', '孕 15 周在电梯里头晕，我还笑着说是没吃早饭', '蓝莓小山', '孕18周', 1683, 'bd8a5ddc39f5'], ['w06', '每天被问「今天还好吗」，我开始害怕走进办公室', '芒果西米露', '孕23周', 1576, '657bd5779003'], ['w08', '交接会上讲完最后一页，我在洗手间待了十分钟', '红豆沙沙', '孕35周', 2130, 'b88db204c69f']],
    baby: [['b07', '我的顺产经历：对我来说最难熬的不是疼，是等', '小船靠岸', '宝宝3个月', 3126, '6440eaf30b5a'], ['b03', '孕20周半夜刷到一个案例，我躺在床上哭到凌晨', '不刷了周周', '孕22周', 2734, 'e4ff8785f404'], ['b02', '孕28周翻了下记账本，零碎小钱加起来吓我一跳', '记账的鱼', '孕28周', 2106, 'c5443c035a02'], ['b04', '孕30周囤了一柜子小衣服，宝宝出生后一半没穿上', '囤囤收手了', '宝宝5个月', 2251, '269846ead50f'], ['b05', '每次产检称体重前，我都会偷偷把外套脱掉', '秤上的梨', '孕26周', 1978, '81541ebb328d'], ['b06', '关于留意胎动，医生教的方法让我不再整天瞎想', '夜里数星星', '孕30周', 1687, 'fba0aa35ada9'], ['b01', '烧心鼻塞加腿抽筋，同事一句「都这样」让我闭了嘴', '豆豆妈咪', '孕21周', 1862, 'b9f151713ad0']]
  };
  var MOMS = ['m03', 'p02', 'm07', 'p05', 'm11', 'p09', 'm14', 'm16', 'p12', 'm19', 'm21', 'p07'];
  function notes(cat) {
    var l = cat ? N[cat] : [N.family[0], N.work[0], N.baby[0], N.family[1], N.work[1], N.baby[1], N.family[2]];
    return l.map(function (a, i) { return { t: a[0], title: a[1], author: a[2], stage: a[3], likes: a[4], photo: 'guangchang/img/' + a[5] + '.jpg', 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);
  }
  function go(id) {
    location.href = 'guangchang/' + (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>' +
    '<div class="g4-sub"><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>翻一翻，看看其他妈妈的故事</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">去广场看全部 ' + T.length + ' 个话题 ›</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) + '" 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">投稿征集</span>' +
      '<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;
    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);
  });
  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); }
  });
  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-cat').addEventListener('click', function (e) {
    var b = e.target.closest('button[data-cat]');
    if (!b || b.classList.contains('on')) return;
    [].forEach.call(sec.querySelectorAll('.g4-cat button'), function (x) { x.classList.toggle('on', x === b); });
    paint(b.dataset.cat);
  });
  paint('', true);
})();