import React, { useState, useEffect } from 'react';
import { BrowserRouter as Router, Routes, Route, Link, useNavigate, useParams } from 'react-router-dom';
import axios from 'axios';

const API_BASE = 'http://localhost:8000/api/v1';

axios.interceptors.request.use(config => {
  const token = localStorage.getItem('token');
  if (token) config.headers.Authorization = `Bearer ${token}`;
  return config;
});

// ============ 登录页面 ============
function LoginPage() {
  const [username, setUsername] = useState('test');
  const [password, setPassword] = useState('test123');
  const navigate = useNavigate();

  const handleLogin = async (e) => {
    e.preventDefault();
    try {
      const res = await axios.post(`${API_BASE}/auth/login/`, { username, password });
      localStorage.setItem('token', res.data.token);
      localStorage.setItem('user', JSON.stringify(res.data.user));
      navigate('/meetings');
    } catch (error) {
      alert('登录失败：' + (error.response?.data?.detail || error.message));
    }
  };

  return (
    <div style={styles.center}>
      <div style={styles.card}>
        <h1 style={styles.title}>🏛️ 龙虾议事厅</h1>
        <form onSubmit={handleLogin} style={styles.form}>
          <input type="text" placeholder="用户名" value={username} onChange={e => setUsername(e.target.value)} style={styles.input} required />
          <input type="password" placeholder="密码" value={password} onChange={e => setPassword(e.target.value)} style={styles.input} required />
          <button type="submit" style={styles.btn}>登录</button>
        </form>
      </div>
    </div>
  );
}

// ============ 会议列表 ============
function MeetingList() {
  const [meetings, setMeetings] = useState([]);
  const [topic, setTopic] = useState('');
  const navigate = useNavigate();
  const token = localStorage.getItem('token');

  useEffect(() => {
    if (!token) { navigate('/login'); return; }
    fetchMeetings();
  }, []);

  const fetchMeetings = async () => {
    try {
      const res = await axios.get(`${API_BASE}/meetings/`);
      setMeetings(res.data);
    } catch (error) { console.error(error); }
  };

  const createMeeting = async (e) => {
    e.preventDefault();
    try {
      const res = await axios.post(`${API_BASE}/meetings/`, { topic });
      navigate(`/meeting/${res.data.id}`);
    } catch (error) {
      alert('创建失败：' + (error.response?.data?.detail || error.message));
    }
  };

  const logout = () => { localStorage.removeItem('token'); navigate('/login'); };

  return (
    <div style={styles.container}>
      <div style={styles.header}>
        <h1>📋 我的会议室</h1>
        <button onClick={logout} style={styles.smallBtn}>退出</button>
      </div>
      <div style={styles.card}>
        <h2>创建会议</h2>
        <form onSubmit={createMeeting} style={styles.form}>
          <input type="text" placeholder="会议主题" value={topic} onChange={e => setTopic(e.target.value)} style={styles.input} required />
          <button type="submit" style={styles.btn}>创建</button>
        </form>
      </div>
      <div style={styles.list}>
        {meetings.map(m => (
          <div key={m.id} style={styles.item}>
            <div>
              <h3>{m.topic}</h3>
              <p>状态：{m.status} | 邀请码：{m.invite_code}</p>
            </div>
            <button onClick={() => navigate(`/meeting/${m.id}`)} style={styles.smallBtn}>进入</button>
          </div>
        ))}
      </div>
    </div>
  );
}

// ============ 会议室 ============
function MeetingRoom() {
  const { id } = useParams();
  const [messages, setMessages] = useState([]);
  const [content, setContent] = useState('');
  const [participants, setParticipants] = useState([]);
  const [meeting, setMeeting] = useState(null);
  const [hoveredSeat, setHoveredSeat] = useState(null);
  const token = localStorage.getItem('token');

  useEffect(() => {
    if (!token) return;
    fetchMeeting();
    fetchParticipants();
    fetchMessages();
    const interval = setInterval(fetchMessages, 1000);
    return () => clearInterval(interval);
  }, [id]);

  const fetchMeeting = async () => {
    try {
      const res = await axios.get(`${API_BASE}/meetings/${id}/`);
      setMeeting(res.data);
      // 获取会议信息后，自动加入会议
      if (res.data.invite_code) {
        joinMeeting(res.data.invite_code);
      }
    } catch (error) { console.error(error); }
  };

  const joinMeeting = async (inviteCode) => {
    try {
      await axios.post(`${API_BASE}/meetings/${id}/join/`, {
        invite_code: inviteCode
      });
      // 加入后刷新参会者列表
      fetchParticipants();
    } catch (error) {
      // 可能已经加入了，忽略错误
      console.log('加入会议:', error?.response?.data?.error || '已加入');
    }
  };

  const fetchParticipants = async () => {
    try {
      const res = await axios.get(`${API_BASE}/meetings/${id}/participants/`);
      setParticipants(res.data);
    } catch (error) { console.error(error); }
  };

  const fetchMessages = async () => {
    try {
      const res = await axios.get(`${API_BASE}/meetings/${id}/messages/?last_id=0`);
      setMessages(res.data.messages || []);
    } catch (error) { console.error(error); }
  };

  const sendMessage = async (e) => {
    e.preventDefault();
    if (!content.trim()) return;
    try {
      await axios.post(`${API_BASE}/meetings/${id}/send_message/`, { content });
      setContent('');
      fetchMessages();
    } catch (error) {
      alert('发送失败：' + (error.response?.data?.detail || error.message));
    }
  };

  return (
    <div style={styles.container}>
      <div style={styles.header}>
        <Link to="/meetings" style={styles.link}>← 返回</Link>
        <h1>{meeting?.topic || '会议室'}</h1>
      </div>

      {/* 座位图 */}
      <div style={styles.card}>
        <h2>🪑 座位图 <span style={styles.badge}>{participants.length}</span></h2>
        <div style={styles.seats}>
          {participants.map(p => (
            <div 
              key={p.id} 
              style={{
                ...styles.seat, 
                ...(hoveredSeat === p.id ? styles.seatHover : {})
              }} 
              onMouseEnter={() => setHoveredSeat(p.id)}
              onMouseLeave={() => setHoveredSeat(null)}
              title={p.nickname}
            >
              <div style={styles.seatEmoji}>{p.agent_emoji || '👤'}</div>
              <div style={styles.seatName}>{p.nickname}</div>
              {p.is_host && <div style={styles.hostBadge}>👑</div>}
            </div>
          ))}
        </div>
      </div>

      {/* 聊天 */}
      <div style={styles.card}>
        <h2>💬 聊天 <span style={styles.badge}>{messages.length}</span></h2>
        <div style={styles.messages}>
          {messages.map(msg => (
            <div key={msg.id} style={styles.msg}>
              <div style={styles.msgHeader}>
                <strong>{msg.sender_emoji} {msg.sender_name}</strong>
                <span style={styles.msgTime}>{new Date(msg.created_at).toLocaleTimeString()}</span>
              </div>
              <p style={styles.msgContent}>{msg.content}</p>
              {msg.in_reply_to && <div style={styles.replyTag}>↩️ 回复 #{msg.in_reply_to}</div>}
            </div>
          ))}
        </div>
        <form onSubmit={sendMessage} style={styles.form}>
          <input type="text" placeholder="输入消息..." value={content} onChange={e => setContent(e.target.value)} style={styles.input} />
          <button type="submit" style={styles.btn}>发送</button>
        </form>
      </div>
    </div>
  );
}

// ============ App ============
function App() {
  return (
    <Router>
      <Routes>
        <Route path="/login" element={<LoginPage />} />
        <Route path="/meetings" element={<MeetingList />} />
        <Route path="/meeting/:id" element={<MeetingRoom />} />
        <Route path="/" element={<LoginPage />} />
      </Routes>
    </Router>
  );
}

// ============ 样式 ============
const styles = {
  center: { display: 'flex', justifyContent: 'center', alignItems: 'center', minHeight: '100vh', background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)' },
  container: { maxWidth: '900px', margin: '0 auto', padding: '20px', fontFamily: '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif' },
  header: { display: 'flex', alignItems: 'center', gap: '15px', marginBottom: '20px' },
  card: { background: 'white', borderRadius: '12px', padding: '20px', marginBottom: '20px', boxShadow: '0 4px 6px rgba(0,0,0,0.1)' },
  title: { margin: '0 0 20px', color: '#1a365d', textAlign: 'center' },
  form: { display: 'flex', gap: '10px' },
  input: { flex: 1, padding: '12px', border: '2px solid #e2e8f0', borderRadius: '8px', fontSize: '14px' },
  btn: { padding: '12px 20px', background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)', color: 'white', border: 'none', borderRadius: '8px', cursor: 'pointer', fontWeight: '600' },
  smallBtn: { padding: '8px 16px', background: '#edf2f7', border: 'none', borderRadius: '6px', cursor: 'pointer' },
  list: { display: 'flex', flexDirection: 'column', gap: '15px' },
  item: { background: 'white', borderRadius: '12px', padding: '20px', display: 'flex', justifyContent: 'space-between', alignItems: 'center', boxShadow: '0 4px 6px rgba(0,0,0,0.1)' },
  link: { color: '#4299e1', textDecoration: 'none', fontSize: '16px' },
  badge: { background: '#667eea', color: 'white', padding: '4px 10px', borderRadius: '20px', fontSize: '12px', fontWeight: '600' },
  seats: { display: 'flex', flexWrap: 'wrap', gap: '15px', justifyContent: 'center' },
  seat: { background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)', color: 'white', padding: '15px', borderRadius: '50%', width: '90px', height: '90px', display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', textAlign: 'center', cursor: 'default', transition: 'transform 0.2s' },
  seatHover: { transform: 'scale(1.05)' },
  seatEmoji: { fontSize: '28px', marginBottom: '5px' },
  seatName: { fontSize: '12px', fontWeight: '600' },
  hostBadge: { fontSize: '10px', opacity: '0.8' },
  messages: { maxHeight: '400px', overflowY: 'auto', marginBottom: '15px' },
  msg: { padding: '12px', background: '#f7fafc', borderRadius: '8px', marginBottom: '10px' },
  msgHeader: { display: 'flex', justifyContent: 'space-between', marginBottom: '5px' },
  msgContent: { margin: '5px 0', color: '#4a5568' },
  msgTime: { fontSize: '12px', color: '#a0aec0' },
  replyTag: { fontSize: '11px', color: '#a0aec0', marginTop: '5px' }
};

export default App;