// 世界聊天前端：微信风气泡 + 轮询增量拉取（1.5s）
// 与后端 /game/api/chat/* 双向打通；登录态沿用 Odoo session cookie（dev-server 同源代理）。
(() => {
  const $ = (id) => document.getElementById(id);
  const me = { uid: null, name: '我' };
  let channels = [];
  let activeChannel = null;       // {id, name}
  let lastId = 0;                 // 已渲染的最大消息 id（增量轮询基准）
  let renderedIds = new Set();   // 已渲染消息 id，避免即时渲染与轮询重复
  let pollTimer = null;

  const TYPE_ICON = { world: '🌐', guild: '🛡️', pm: '💬', guide: '🤖' };

  // ---------- 工具 ----------
  function fmtTime(s) {
    // 中国习惯：今天 HH:mm / 昨天 昨天 HH:mm / 更早 MM-DD HH:mm
    const d = new Date(s.replace(' ', 'T'));
    if (isNaN(d)) return '';
    const now = new Date();
    const pad = (n) => String(n).padStart(2, '0');
    const hm = pad(d.getHours()) + ':' + pad(d.getMinutes());
    const sameDay = d.toDateString() === now.toDateString();
    const yest = new Date(now); yest.setDate(now.getDate() - 1);
    if (sameDay) return hm;
    if (d.toDateString() === yest.toDateString()) return '昨天 ' + hm;
    return pad(d.getMonth() + 1) + '-' + pad(d.getDate()) + ' ' + hm;
  }

  async function api(path, opts) {
    const res = await fetch(path, Object.assign({ credentials: 'same-origin' }, opts));
    return res.json();
  }

  function escapeHtml(s) {
    return (s || '').replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));
  }

  function scrollBottom() {
    const m = $('messages');
    m.scrollTop = m.scrollHeight;
  }

  // ---------- 渲染 ----------
  function renderChannels() {
    const box = $('channels');
    box.innerHTML = '';
    channels.forEach((ch) => {
      const el = document.createElement('div');
      el.className = 'channel' + (activeChannel && ch.id === activeChannel.id ? ' active' : '');
      el.innerHTML = `<span class="ico">${TYPE_ICON[ch.type] || '💬'}</span>
                      <span class="name">${escapeHtml(ch.name)}</span>`;
      el.onclick = () => selectChannel(ch);
      box.appendChild(el);
    });
  }

  function renderMessage(m, prepend) {
    if (renderedIds.has(m.id)) return;   // 去重：即时渲染与轮询可能重复拉到同一消息
    renderedIds.add(m.id);
    const isGuide = !!m.is_guide;
    const row = document.createElement('div');
    row.className = 'row' + (m.is_self ? ' self' : '') + (isGuide ? ' guide' : '');
    const initial = isGuide ? '🤖' : (m.author_name || '?').slice(0, 1);
    row.innerHTML = `
      <div class="ava">${escapeHtml(initial)}</div>
      <div class="bubble-wrap">
        <div class="meta"><span>${escapeHtml(m.author_name)}</span><span>${fmtTime(m.create_date)}</span></div>
        <div class="bubble">${escapeHtml(m.body)}</div>
      </div>`;
    const box = $('messages');
    if (prepend) box.insertBefore(row, box.firstChild);
    else box.appendChild(row);
    if (m.id > lastId) lastId = m.id;
  }

  function setStatus(t) { $('status').textContent = t || ''; }

  // ---------- 流程 ----------
  async function loadMe() {
    const data = await api('/game/api/me');
    if (data.uid) {
      me.uid = data.uid;
      me.name = data.name || '我';
      $('meText').textContent = me.name;
      $('meAvatar').textContent = (me.name || '?').slice(0, 1);
      $('mask').classList.add('hidden');
      $('input').disabled = false;
      $('sendBtn').disabled = false;
    } else {
      $('mask').classList.remove('hidden');
    }
  }

  async function loadChannels() {
    const data = await api('/game/api/chat/channels');
    channels = data.items || [];
    if (!channels.length) { setStatus('暂无频道'); return; }
    renderChannels();
    const first = channels[0];
    selectChannel(first);
  }

  async function selectChannel(ch) {
    activeChannel = ch;
    lastId = 0;
    renderedIds.clear();
    $('messages').innerHTML = '';
    $('chTitle').textContent = ch.name;
    $('chSub').textContent = ch.type === 'guide'
      ? '向宇森向导提问，了解属性 / 等级 / 货币 / 制度'
      : '和大家聊聊宇森世界吧';
    renderChannels();
    setStatus('加载中…');
    const data = await api(`/game/api/chat/messages?channel_id=${ch.id}&limit=50`);
    const items = (data.items || []).slice().sort((a, b) => a.id - b.id);
    items.forEach((m) => renderMessage(m));
    scrollBottom();
    setStatus(items.length ? '' : '还没有人说话，来抢沙发～');
    startPoll();
  }

  function startPoll() {
    if (pollTimer) clearInterval(pollTimer);
    pollTimer = setInterval(async () => {
      if (!activeChannel) return;
      const data = await api(`/game/api/chat/messages?channel_id=${activeChannel.id}&after_id=${lastId}`);
      const items = data.items || [];
      if (items.length) {
        items.forEach((m) => renderMessage(m));
        scrollBottom();
      }
    }, 1500);
  }

  async function send() {
    const ta = $('input');
    const body = ta.value.trim();
    if (!body || !activeChannel) return;
    const btn = $('sendBtn');
    btn.disabled = true;
    const data = await api('/game/api/chat/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ channel_id: activeChannel.id, body }),
    });
    btn.disabled = false;
    if (data.ok) {
      ta.value = '';
      renderMessage(data.message, false);
      if (data.guide_reply) renderMessage(data.guide_reply, false);
      scrollBottom();
    } else {
      setStatus(data.error || '发送失败');
    }
  }

  // ---------- 事件 ----------
  $('sendBtn').onclick = send;
  $('input').addEventListener('keydown', (e) => {
    if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); send(); }
  });

  // ---------- 启动 ----------
  (async () => {
    await loadMe();
    await loadChannels();
  })();
})();