import React, { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import axios from 'axios';

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

function Dashboard() {
  const [lobsters, setLobsters] = useState([]);
  const [loading, setLoading] = useState(true);
  const navigate = useNavigate();

  useEffect(() => {
    fetchLobsters();
    const interval = setInterval(fetchLobsters, 5000);
    return () => clearInterval(interval);
  }, []);

  const fetchLobsters = async () => {
    try {
      const response = await axios.get(`${API_BASE}/lobsters/`);
      setLobsters(response.data);
      setLoading(false);
    } catch (error) {
      console.error('获取龙虾状态失败:', error);
    }
  };

  if (loading) {
    return <div className="loading">加载中...</div>;
  }

  return (
    <div className="dashboard">
      <h1>🦞 龙虾舰队监控中心</h1>
      <div className="lobster-grid">
        {lobsters.map(lobster => (
          <div key={lobster.id} className="lobster-card">
            <div className="lobster-header">
              <span className="lobster-name">{lobster.emoji} {lobster.name}</span>
              <span className={`status status-${lobster.status}`}>{lobster.status}</span>
            </div>
            <div className="lobster-info">
              <p>专长：{lobster.specialty}</p>
              <p>端口：{lobster.port}</p>
              <p>容器：{lobster.container}</p>
            </div>
            <div className="lobster-actions">
              <button className="detail-btn" onClick={() => navigate(`/lobster/${lobster.id}`)}>
                📊 详情
              </button>
              <button className="memory-btn" onClick={() => navigate(`/lobster/${lobster.id}/memory`)}>
                🧠 记忆
              </button>
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}

export default Dashboard;

// CSS 样式
const styles = `
.dashboard {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

.dashboard h1 {
  color: #1a365d;
  margin-bottom: 30px;
  text-align: center;
}

.lobster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.lobster-card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.lobster-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.lobster-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e2e8f0;
}

.lobster-name {
  font-size: 1.3em;
  font-weight: bold;
  color: #2d3748;
}

.status {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85em;
  font-weight: 600;
}

.status-healthy {
  background: #c6f6d5;
  color: #22543d;
}

.status-warning {
  background: #feebc8;
  color: #744210;
}

.status-error {
  background: #fed7d7;
  color: #742a2a;
}

.lobster-info {
  margin-bottom: 20px;
}

.lobster-info p {
  margin: 8px 0;
  color: #4a5568;
  display: flex;
  justify-content: space-between;
}

.lobster-actions {
  display: flex;
  gap: 10px;
}

.lobster-actions button {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-size: 1em;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 600;
}

.detail-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.detail-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(102, 126, 234, 0.4);
}

.memory-btn {
  background: #edf2f7;
  color: #4a5568;
}

.memory-btn:hover {
  background: #e2e8f0;
  transform: translateY(-2px);
}

.loading {
  text-align: center;
  padding: 50px;
  color: #718096;
  font-size: 1.2em;
}
`;

// 注入样式
if (typeof document !== 'undefined') {
  const styleSheet = document.createElement('style');
  styleSheet.textContent = styles;
  document.head.appendChild(styleSheet);
}