// FunConnect Client - Renderer Logic
const $ = (sel) => document.querySelector(sel);
const $$ = (sel) => document.querySelectorAll(sel);

let isConnected = false;
let currentServerUrl = '';

// ===== Window Controls =====
$('#btn-min').addEventListener('click', () => window.funmc.minimize());
$('#btn-max').addEventListener('click', () => window.funmc.maximize());
$('#btn-close').addEventListener('click', () => window.funmc.close());

// ===== Navigation =====
$$('.nav-item').forEach(item => {
  item.addEventListener('click', () => {
    const page = item.dataset.page;
    $$('.nav-item').forEach(n => n.classList.remove('active'));
    item.classList.add('active');
    $$('.page').forEach(p => p.classList.remove('active'));
    $(`#page-${page}`).classList.add('active');
  });
});

// ===== Connect Page =====
$('#btn-connect').addEventListener('click', async () => {
  const url = $('#server-url').value.trim();
  if (!url) {
    showMsg('#connect-msg', '请输入服务器地址', 'error');
    return;
  }

  const btn = $('#btn-connect');
  btn.disabled = true;
  btn.innerHTML = '<span class="spinner"></span> 连接中...';
  showMsg('#connect-msg', '', '');

  const result = await window.funmc.connectServer(url);

  if (result.success) {
    isConnected = true;
    currentServerUrl = url;
    updateServerStatus(true);
    showMsg('#connect-msg', '连接成功！', 'success');
    showServerInfo(result.data);
  } else {
    isConnected = false;
    updateServerStatus(false);
    showMsg('#connect-msg', '连接失败: ' + result.error, 'error');
  }

  btn.disabled = false;
  btn.textContent = '连接服务器';
});

function showServerInfo(data) {
  const grid = $('#server-info-grid');
  grid.innerHTML = '';
  const items = [
    { label: '节点名称', value: data.nodeName || 'N/A' },
    { label: '节点ID', value: data.nodeId || 'N/A' },
    { label: '运行模式', value: data.isMaster ? '主节点' : '工作节点' },
    { label: '运行状态', value: data.status === 'ok' ? '正常' : '异常' },
    { label: '运行时间', value: formatUptime(data.uptime || 0) },
    { label: '版本', value: 'v1.0.0' },
  ];
  items.forEach(item => {
    const div = document.createElement('div');
    div.className = 'info-item';
    div.innerHTML = `<div class="label">${item.label}</div><div class="value">${item.value}</div>`;
    grid.appendChild(div);
  });
  $('#server-info').classList.remove('hidden');
}

function updateServerStatus(online) {
  const dot = $('#server-status .status-dot');
  const text = $('#server-status .status-text');
  if (online) {
    dot.className = 'status-dot online';
    text.textContent = '已连接';
  } else {
    dot.className = 'status-dot offline';
    text.textContent = '未连接';
  }
}

// ===== Rooms Page =====
$('#btn-refresh-rooms').addEventListener('click', loadRooms);

async function loadRooms() {
  if (!isConnected) {
    $('#rooms-list').innerHTML = '<div class="empty-state"><span class="empty-icon">🔗</span><p>请先连接服务器</p></div>';
    return;
  }

  $('#rooms-list').innerHTML = '<div class="empty-state"><span class="spinner"></span><p>加载中...</p></div>';

  const result = await window.funmc.listRooms();
  if (!result.success) {
    $('#rooms-list').innerHTML = `<div class="empty-state"><span class="empty-icon">❌</span><p>${result.error}</p></div>`;
    return;
  }

  const rooms = result.data.rooms || [];
  if (rooms.length === 0) {
    $('#rooms-list').innerHTML = '<div class="empty-state"><span class="empty-icon">🎮</span><p>暂无在线房间</p></div>';
    return;
  }

  $('#rooms-list').innerHTML = rooms.map(room => `
    <div class="room-card" data-id="${room.id}">
      <div class="room-left">
        <div class="room-icon">🎮</div>
        <div>
          <div class="room-name">${escapeHtml(room.name)} ${room.password ? '🔒' : ''}</div>
          <div class="room-meta">房间号: ${room.id} | 房主: ${escapeHtml(room.hostName)}</div>
        </div>
      </div>
      <div class="room-right">
        <span class="room-players">👥 ${room.currentPlayers}/${room.maxPlayers}</span>
        <span class="room-version">${room.gameEdition === 'java' ? 'Java' : '基岩'} ${room.gameVersion}</span>
        <button class="room-btn-join" onclick="quickJoin('${room.id}')">加入</button>
      </div>
    </div>
  `).join('');
}

function quickJoin(roomId) {
  // Navigate to join page and fill in room ID
  $$('.nav-item').forEach(n => n.classList.remove('active'));
  document.querySelector('[data-page="join"]').classList.add('active');
  $$('.page').forEach(p => p.classList.remove('active'));
  $('#page-join').classList.add('active');
  $('#join-room-id').value = roomId;
}

// ===== Host Page =====
$('#btn-host').addEventListener('click', async () => {
  if (!isConnected) {
    showMsg('#host-msg', '请先连接服务器', 'error');
    return;
  }

  const name = $('#host-name').value.trim();
  const port = parseInt($('#host-port').value);
  const version = $('#host-version').value.trim();
  const edition = $('#host-edition').value;
  const maxPlayers = parseInt($('#host-maxplayers').value);
  const password = $('#host-password').value;

  if (!name) {
    showMsg('#host-msg', '请输入房间名称', 'error');
    return;
  }

  const btn = $('#btn-host');
  btn.disabled = true;
  btn.innerHTML = '<span class="spinner"></span> 创建中...';
  showMsg('#host-msg', '', '');

  const result = await window.funmc.hostRoom({
    serverUrl: currentServerUrl,
    roomName: name,
    localMcPort: port,
    gameVersion: version,
    gameEdition: edition,
    maxPlayers: maxPlayers,
    password: password || undefined,
  });

  if (result.success) {
    showMsg('#host-msg', '', '');
    $('#host-room-id').textContent = result.data.room.id;
    $('#host-result').classList.remove('hidden');
  } else {
    showMsg('#host-msg', '创建失败: ' + result.error, 'error');
  }

  btn.disabled = false;
  btn.textContent = '创建房间';
});

$('#btn-copy-room').addEventListener('click', () => {
  const roomId = $('#host-room-id').textContent;
  navigator.clipboard.writeText(roomId).then(() => {
    $('#btn-copy-room').textContent = '已复制！';
    setTimeout(() => { $('#btn-copy-room').textContent = '复制房间号'; }, 2000);
  });
});

// ===== Join Page =====
$('#btn-join').addEventListener('click', async () => {
  const roomId = $('#join-room-id').value.trim();
  const host = $('#join-host').value.trim();
  const port = parseInt($('#join-port').value);
  const localPort = parseInt($('#join-local-port').value);

  if (!roomId) {
    showMsg('#join-msg', '请输入房间号', 'error');
    return;
  }
  if (!host) {
    showMsg('#join-msg', '请输入中继服务器地址', 'error');
    return;
  }

  const btn = $('#btn-join');
  btn.disabled = true;
  btn.innerHTML = '<span class="spinner"></span> 连接中...';
  showMsg('#join-msg', '', '');

  const result = await window.funmc.joinRoom({
    serverHost: host,
    serverPort: port,
    roomId: roomId,
    localPort: localPort,
  });

  if (result.success) {
    showMsg('#join-msg', '', '');
    $('#join-active-port').textContent = String(localPort);
    $('#join-status').classList.remove('hidden');
    $('#btn-join').classList.add('hidden');
    $('#btn-leave').classList.remove('hidden');
  } else {
    showMsg('#join-msg', '加入失败: ' + result.error, 'error');
  }

  btn.disabled = false;
  btn.textContent = '加入房间';
});

$('#btn-leave').addEventListener('click', async () => {
  await window.funmc.disconnect();
  $('#join-status').classList.add('hidden');
  $('#btn-join').classList.remove('hidden');
  $('#btn-leave').classList.add('hidden');
  showMsg('#join-msg', '已断开连接', 'success');
});

// ===== Relay Status Events =====
window.funmc.onRelayStatus((data) => {
  if (data.status === 'disconnected') {
    $('#join-status').classList.add('hidden');
    $('#btn-join').classList.remove('hidden');
    $('#btn-leave').classList.add('hidden');
    showMsg('#join-msg', '连接已断开', 'error');
  } else if (data.status === 'error') {
    showMsg('#join-msg', '连接错误: ' + data.error, 'error');
  }
});

// ===== Auto-refresh rooms when navigating =====
document.querySelector('[data-page="rooms"]').addEventListener('click', () => {
  if (isConnected) loadRooms();
});

// ===== Utilities =====
function showMsg(selector, text, type) {
  const el = $(selector);
  el.textContent = text;
  el.className = 'msg' + (type ? ' ' + type : '');
}

function escapeHtml(str) {
  const div = document.createElement('div');
  div.textContent = str;
  return div.innerHTML;
}

function formatUptime(seconds) {
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = Math.floor(seconds % 60);
  if (h > 0) return `${h}时${m}分${s}秒`;
  if (m > 0) return `${m}分${s}秒`;
  return `${s}秒`;
}