// import React, { useEffect, useState } from 'react';
// import axios from 'axios';
// import UserNav from './UserNav';
// import Header from '../../components/Header';
// import './UserFriends.css';
// import { useUser } from '../../context/UserContext';

// const UserFriends = () => {
//   const { user, loading } = useUser();
//   const [friends, setFriends] = useState([]);
//   const [error, setError] = useState(null);

//   // 私信相关状态
//   const [chatOpen, setChatOpen] = useState(false);
//   const [chatFriend, setChatFriend] = useState(null);
//   const [messageContent, setMessageContent] = useState('');
//   const [sendingStatus, setSendingStatus] = useState(null);

//   // 新增：聊天记录
//   const [chatMessages, setChatMessages] = useState([]);
//   const [loadingMessages, setLoadingMessages] = useState(false);
//   const [messagesError, setMessagesError] = useState(null);

//   useEffect(() => {
//     if (loading) return;

//     const fetchFriends = async () => {
//       if (!user || !user.userId) {
//         setError('未登录或用户信息缺失');
//         return;
//       }

//       try {
//         const res = await axios.get(`/echo/user/${user.userId}/friends`);
//         setFriends(res.data || []);
//         setError(null);
//       } catch (err) {
//         setError('加载好友失败，请稍后再试');
//       }
//     };

//     fetchFriends();
//   }, [user, loading]);

//   // 打开聊天框时加载聊天记录
//   const openChat = async (friend) => {
//     setChatFriend(friend);
//     setMessageContent('');
//     setSendingStatus(null);
//     setChatMessages([]);
//     setMessagesError(null);
//     setChatOpen(true);

//     if (!user || !user.userId) return;

//     setLoadingMessages(true);
//     try {
//       const res = await axios.get(`/echo/message/${user.userId}/getUserMessages`);
//       if (res.data.status === 'success') {
//         // 过滤出和这个好友的聊天消息（发或收都算）
//         const allMessages = res.data.messages || [];
//         const related = allMessages.filter(m =>
//           (m.sender_id === user.userId && m.receiver_id === friend.id) ||
//           (m.sender_id === friend.id && m.receiver_id === user.userId)
//         );
//         // 按时间排序（升序）
//         related.sort((a, b) => new Date(a.timestamp) - new Date(b.timestamp));
//         setChatMessages(related);
//       } else {
//         setMessagesError('无法加载聊天记录');
//       }
//     } catch (err) {
//       setMessagesError('加载聊天记录失败，请稍后再试');
//     } finally {
//       setLoadingMessages(false);
//     }
//   };

//   const closeChat = () => {
//     setChatOpen(false);
//     setChatFriend(null);
//     setMessageContent('');
//     setSendingStatus(null);
//     setChatMessages([]);
//     setMessagesError(null);
//   };

//   const sendMessage = async () => {
//     if (!messageContent.trim()) {
//       setSendingStatus('消息不能为空');
//       return;
//     }
//     setSendingStatus('发送中...');
//     try {
//       const res = await axios.post('/echo/message/sendMessages', {
//         sender_id: user.userId,
//         receiver_id: chatFriend.id,
//         content: messageContent.trim(),
//       });
//       if (res.data.status === 'success') {
//         setSendingStatus('发送成功');
//         setMessageContent('');
//         // 发送成功后，将这条消息追加到聊天记录
//         const newMsg = {
//           message_id: res.data.message_id,
//           sender_id: user.userId,
//           sender_username: user.username || '我',
//           receiver_id: chatFriend.id,
//           receiver_username: chatFriend.nickname,
//           content: messageContent.trim(),
//           timestamp: new Date().toISOString(),
//         };
//         setChatMessages(prev => [...prev, newMsg]);
//       } else {
//         setSendingStatus(res.data.message || '发送失败');
//       }
//     } catch (err) {
//       setSendingStatus('发送失败，请稍后再试');
//     }
//   };

//   if (loading) return <p>正在加载...</p>;
//   if (error) return <p className="error">{error}</p>;

//   return (
//     <div className="user-friends-container">
//       <Header />
//       <div className="user-center">
//         <div className="user-nav-container">
//           <UserNav />
//         </div>
//         <div className="common-card">
//           <h2>我的好友</h2>
//           <div className="friends-list">
//             {friends.length === 0 && <p>暂无好友</p>}
//             {friends.map((friend) => (
//               <div key={friend.id} className="friend-card">
//                 <img src={friend.avatar} alt={friend.nickname} className="friend-avatar" />
//                 <div className="friend-info">
//                   <p><strong>{friend.nickname}</strong></p>
//                   <p>{friend.email}</p>
//                   <button
//                     className="send-message-btn"
//                     onClick={() => openChat(friend)}
//                   >
//                     发送私信
//                   </button>
//                 </div>
//               </div>
//             ))}
//           </div>
//         </div>
//       </div>

//       {/* 私信弹窗 */}
//       {chatOpen && (
//         <div className="chat-modal">
//           <div className="chat-modal-content">
//             <h3>给 {chatFriend.nickname} 发送私信</h3>
//             <div className="chat-messages" style={{height: '250px', overflowY: 'auto', border: '1px solid #ccc', padding: '8px', marginBottom: '8px'}}>
//               {loadingMessages && <p>加载聊天记录中...</p>}
//               {messagesError && <p className="error">{messagesError}</p>}
//               {!loadingMessages && chatMessages.length === 0 && <p>暂无聊天记录</p>}
//               {chatMessages.map(msg => (
//                 <div
//                   key={msg.message_id}
//                   style={{
//                     textAlign: msg.sender_id === user.userId ? 'right' : 'left',
//                     marginBottom: '8px'
//                   }}
//                 >
//                   <div style={{
//                     display: 'inline-block',
//                     backgroundColor: msg.sender_id === user.userId ? '#409eff' : '#f0f0f0',
//                     color: msg.sender_id === user.userId ? 'white' : 'black',
//                     borderRadius: '10px',
//                     padding: '6px 12px',
//                     maxWidth: '70%',
//                     wordBreak: 'break-word'
//                   }}>
//                     <p style={{margin: 0}}>{msg.content}</p>
//                     <small style={{fontSize: '10px', opacity: 0.7}}>
//                       {new Date(msg.timestamp).toLocaleString()}
//                     </small>
//                   </div>
//                 </div>
//               ))}
//             </div>
//             <textarea
//               rows="3"
//               value={messageContent}
//               onChange={(e) => setMessageContent(e.target.value)}
//               placeholder="输入消息内容"
//               style={{width: '100%', marginBottom: '8px'}}
//             />
//             <div className="chat-actions">
//               <button onClick={sendMessage}>发送</button>
//               <button onClick={closeChat}>关闭</button>
//             </div>
//             {sendingStatus && <p className="status-msg">{sendingStatus}</p>}
//           </div>
//           <div className="chat-modal-backdrop" onClick={closeChat}></div>
//         </div>
//       )}
//     </div>
//   );
// };

// export default UserFriends;

import React, { useEffect, useState } from 'react';
import axios from 'axios';
import { useUser } from '../../context/UserContext';
import './UserFriends.css';

const UserFriends = () => {
  const { user, loading } = useUser();
  const [friends, setFriends] = useState([]);
  const [error, setError] = useState(null);

  const [chatOpen, setChatOpen] = useState(false);
  const [chatFriend, setChatFriend] = useState(null);
  const [messageContent, setMessageContent] = useState('');
  const [sendingStatus, setSendingStatus] = useState(null);
  const [chatMessages, setChatMessages] = useState([]);
  const [loadingMessages, setLoadingMessages] = useState(false);
  const [messagesError, setMessagesError] = useState(null);

  const [email, setEmail] = useState('');

  useEffect(() => {
    if (loading) return;

    const fetchFriends = async () => {
      if (!user || !user.userId) {
        setError('未登录或用户信息缺失');
        return;
      }

      try {
        const res = await axios.get(`/echo/user/${user.userId}/friends`);
        setFriends(res.data || []);
        setError(null);
      } catch (err) {
        setError('加载好友失败，请稍后再试');
      }
    };

    fetchFriends();
  }, [user, loading]);

  const openChat = async (friend) => {
    setChatFriend(friend);
    setMessageContent('');
    setSendingStatus(null);
    setChatMessages([]);
    setMessagesError(null);
    setChatOpen(true);

    if (!user || !user.userId) return;

    setLoadingMessages(true);
    try {
      const res = await axios.get(`/echo/message/${user.userId}/getUserMessages`);
      if (res.data.status === 'success') {
        const allMessages = res.data.messages || [];
        const related = allMessages.filter(m =>
          (m.sender_id === user.userId && m.receiver_id === friend.id) ||
          (m.sender_id === friend.id && m.receiver_id === user.userId)
        );
        related.sort((a, b) => new Date(a.timestamp) - new Date(b.timestamp));
        setChatMessages(related);
      } else {
        setMessagesError('无法加载聊天记录');
      }
    } catch (err) {
      setMessagesError('加载聊天记录失败，请稍后再试');
    } finally {
      setLoadingMessages(false);
    }
  };

  const closeChat = () => {
    setChatOpen(false);
    setChatFriend(null);
    setMessageContent('');
    setSendingStatus(null);
    setChatMessages([]);
    setMessagesError(null);
  };

  const sendMessage = async () => {
    if (!messageContent.trim()) {
      setSendingStatus('消息不能为空');
      return;
    }
    setSendingStatus('发送中...');
    try {
      const res = await axios.post('/echo/message/sendMessages', {
        sender_id: user.userId,
        receiver_id: chatFriend.id,
        content: messageContent.trim(),
      });
      if (res.data.status === 'success') {
        setSendingStatus('发送成功');
        setMessageContent('');
        const newMsg = {
          message_id: res.data.message_id,
          sender_id: user.userId,
          sender_username: user.username || '我',
          receiver_id: chatFriend.id,
          receiver_username: chatFriend.nickname,
          content: messageContent.trim(),
          timestamp: new Date().toISOString(),
        };
        setChatMessages(prev => [...prev, newMsg]);
      } else {
        setSendingStatus(res.data.message || '发送失败');
      }
    } catch (err) {
      setSendingStatus('发送失败，请稍后再试');
    }
  };

  const handleSubmit = async () => {
    const res = await axios.post(`/echo/user/addFriend`, { email: email, userid: user.userId });
    console.log(res);
    const response = await axios.get(`/echo/user/${user.userId}/friends`);
    setFriends(response.data || []);
    alert(res.data.msg);
  }

  if (loading) return <p>正在加载...</p>;
  if (error) return <p className="error">{error}</p>;

  return (
    <div className="user-subpage-card">
      <h2>我的好友</h2>
      <div>
        <input type="text" value={email} placeholder="请输入好友邮箱" onChange={e => setEmail(e.target.value)} />
        <button className="btn submit" onClick={handleSubmit}>
          添加
        </button>
      </div>
      <div className="friends-list">
        {friends.length === 0 && <p>暂无好友</p>}
        {friends.map((friend) => (
          <div key={friend.id} className="friend-card">
            <img src={friend.avatar} alt={friend.nickname} className="friend-avatar" />
            <div className="friend-info">
              <p><strong>{friend.nickname}</strong></p>
              <p>{friend.email}</p>
              <button className="send-message-btn" onClick={() => openChat(friend)}>
                发送私信
              </button>
            </div>
          </div>
        ))}
      </div>

      {/* 私信弹窗 */}
      {chatOpen && (
        <div className="chat-modal">
          <div className="chat-modal-content">
            <h3>给 {chatFriend.nickname} 发送私信</h3>
            <div className="chat-messages">
              {loadingMessages && <p>加载聊天记录中...</p>}
              {messagesError && <p className="error">{messagesError}</p>}
              {!loadingMessages && chatMessages.length === 0 && <p>暂无聊天记录</p>}
              {chatMessages.map(msg => (
                <div
                  key={msg.message_id}
                  style={{
                    textAlign: msg.sender_id === user.userId ? 'right' : 'left',
                    marginBottom: '8px'
                  }}
                >
                  <div className={`chat-bubble ${msg.sender_id === user.userId ? 'self' : 'other'}`}>
                    <p>{msg.content}</p>
                    <small>{new Date(msg.timestamp).toLocaleString()}</small>
                  </div>
                </div>
              ))}
            </div>
            <textarea
              rows="3"
              value={messageContent}
              onChange={(e) => setMessageContent(e.target.value)}
              placeholder="输入消息内容"
            />
            <div className="chat-actions">
              <button onClick={sendMessage}>发送</button>
              <button onClick={closeChat}>关闭</button>
            </div>
            {sendingStatus && <p className="status-msg">{sendingStatus}</p>}
          </div>
          <div className="chat-modal-backdrop" onClick={closeChat}></div>
        </div>
      )}
    </div>
  );
};

export default UserFriends;