// AI 控制台（顶级 Tab）：DeepSeek 风格聊天 + 流式输出 + 实时 MCP 步骤
let _agentBusy = false;
let _agentStream = null;      // EventSource
let _agentCfgLoaded = false;

// ================== 初始化 ==================
function initAgentChat(){
  if(_agentCfgLoaded)return;
  _agentCfgLoaded = true;
  loadAgentConfig();
  const chat = document.getElementById('agent-chat');
  if(chat && !chat.children.length){
    chat.innerHTML = '<div class="agent-empty">👋 给 AI 下达指令，它将通过截图观察手机并执行操作。<br>'
      + '例如：「打开抖音搜索奚学东，告诉我第一个视频的标题」<br>'
      + '点击右上角 ⚙ 配置模型与 API Key。</div>';
  }
  // 输入框快捷键
  const inp = document.getElementById('agent-input');
  inp.addEventListener('keydown', ev=>{
    if(ev.key==='Enter' && !ev.shiftKey){
      ev.preventDefault();
      if(!_agentBusy) sendAgentMsg();
    }
  });
}

// ================== 配置 ==================
function loadAgentConfig(){
  apiGet('/api/agent/config').then(r=>{
    if(!r||!r.ok)return;
    const tag = document.getElementById('agent-model-tag');
    if(tag && r.model) tag.textContent = r.model;
  });
}
function openAgentConfig(){
  apiGet('/api/agent/config').then(r=>{
    if(!r||!r.ok)return;
    document.getElementById('acfg-base').value = r.api_base || 'https://api.deepseek.com';
    document.getElementById('acfg-model').value = r.model || '';
    document.getElementById('acfg-serial').value = r.default_serial || '';
    document.getElementById('acfg-key-hint').textContent =
      r.api_key_masked ? ('已配置 ' + r.api_key_masked) : '未配置';
    document.getElementById('acfg-key').value = '';
    document.getElementById('agent-cfg-overlay').style.display = 'flex';
  });
}
function closeAgentConfig(){
  document.getElementById('agent-cfg-overlay').style.display = 'none';
}
function saveAgentConfig(){
  const body = {
    api_base: document.getElementById('acfg-base').value.trim(),
    model: document.getElementById('acfg-model').value.trim(),
    default_serial: document.getElementById('acfg-serial').value.trim(),
  };
  const key = document.getElementById('acfg-key').value.trim();
  if(key) body.api_key = key;
  apiPost('/api/agent/config', body).then(r=>{
    if(r&&r.ok){
      showToast('配置已保存','success');
      closeAgentConfig();
      loadAgentConfig();
    }else showToast('保存失败: ' + ((r&&r.error)||''),'error');
  });
}

// ================== 聊天渲染 ==================
function addUserMsg(text){
  const chat = document.getElementById('agent-chat');
  clearEmpty();
  const div = document.createElement('div');
  div.className = 'agent-msg user';
  div.textContent = text;
  chat.appendChild(div);
  scrollChat();
}
function newAssistantMsg(){
  const chat = document.getElementById('agent-chat');
  clearEmpty();
  const div = document.createElement('div');
  div.className = 'agent-msg assistant';
  div.innerHTML = '<div class="agent-toolcards"></div><div class="agent-text"></div>';
  chat.appendChild(div);
  scrollChat();
  return div;
}
function clearEmpty(){
  const empty = document.querySelector('#agent-chat .agent-empty');
  if(empty) empty.remove();
}
function scrollChat(){
  const chat = document.getElementById('agent-chat');
  chat.scrollTop = chat.scrollHeight;
}
function clearAgentChat(){
  document.getElementById('agent-chat').innerHTML =
    '<div class="agent-empty">对话已清空。给 AI 下达新指令…</div>';
}

// ================== 发送与流式接收 ==================
function sendAgentMsg(){
  if(_agentBusy){showToast('上一轮还在运行','error');return;}
  const inp = document.getElementById('agent-input');
  const text = inp.value.trim();
  if(!text){showToast('请输入指令','error');return;}
  inp.value = '';
  addUserMsg(text);

  apiPost('/api/agent/run', {prompt: text}).then(r=>{
    if(!r||!r.ok){
      const msg = r ? (r.error||'启动失败') : '请求失败';
      const div = newAssistantMsg();
      div.querySelector('.agent-text').textContent = '⚠ ' + msg;
      showToast(msg,'error');
      return;
    }
    _agentBusy = true;
    document.getElementById('agent-running-tag').style.display = 'inline';
    document.getElementById('btn-agent-send').disabled = true;
    listenStream(r.run_id);
  });
}

function listenStream(runId){
  if(_agentStream) _agentStream.close();
  const es = new EventSource('/api/agent/stream?run_id=' + runId);
  _agentStream = es;
  let msgEl = null;

  es.addEventListener('delta', ev=>{
    if(!msgEl) msgEl = newAssistantMsg();
    const d = JSON.parse(ev.data);
    const textEl = msgEl.querySelector('.agent-text');
    if(d.kind === 'reasoning'){
      let r = msgEl.querySelector('.reasoning');
      if(!r){
        r = document.createElement('div');
        r.className = 'reasoning';
        msgEl.insertBefore(r, textEl);
      }
      r.textContent += d.text;
    }else{
      textEl.textContent += d.text;
    }
    scrollChat();
  });

  es.addEventListener('step', ev=>{
    const d = JSON.parse(ev.data);
    if(!msgEl) msgEl = newAssistantMsg();
    const cards = msgEl.querySelector('.agent-toolcards');
    const card = document.createElement('div');
    card.className = 'agent-toolcard';
    card.innerHTML = '<span class="dot"></span>'
      + '<code style="color:var(--teal)">' + esc(d.tool||'') + '</code>'
      + '<span class="text-muted">' + esc(d.args||'') + '</span>';
    if(d.image){
      const img = document.createElement('img');
      img.src = 'data:image/jpeg;base64,' + d.image;
      card.appendChild(img);
    }
    cards.appendChild(card);
    scrollChat();
  });

  es.addEventListener('done', ev=>{
    const d = JSON.parse(ev.data);
    if(d.answer){
      if(!msgEl) msgEl = newAssistantMsg();
      msgEl.querySelector('.agent-text').textContent = d.answer;
    }
    endRun();
  });

  es.addEventListener('error', ev=>{
    let msg = '连接中断';
    try{
      if(ev.data) msg = JSON.parse(ev.data).message || msg;
    }catch(e){}
    if(!msgEl) msgEl = newAssistantMsg();
    msgEl.querySelector('.agent-text').textContent = '⚠ ' + msg;
    endRun();
  });

  es.onerror = ()=>{
    // 事件流正常结束（done 后服务器关流）会触发一次 error——done 已处理则忽略
    if(_agentBusy) endRun();
  };
}

function endRun(){
  _agentBusy = false;
  _agentStream && _agentStream.close();
  _agentStream = null;
  document.getElementById('agent-running-tag').style.display = 'none';
  document.getElementById('btn-agent-send').disabled = false;
  scrollChat();
}