import React, { useState, useEffect } from 'react';
import { Link } from 'wouter';
import axios from 'axios';
import { GoodTwo, Comment } from '@icon-park/react';
import logo from '../../assets/logo.png';
import './ForumPage.css';

const API_BASE = process.env.REACT_APP_API_BASE;

const ForumPage = () => {
  const [posts, setPosts] = useState([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [size, setSize] = useState(10);
  const [loading, setLoading] = useState(true);
  const [errorMsg, setErrorMsg] = useState('');

  const totalPages = Math.ceil(total / size);

  useEffect(() => {
    const fetchPosts = async () => {
      setLoading(true);
      setErrorMsg('');
      try {
        const response = await axios.get(`${API_BASE}/echo/forum/posts/getAllPost`, {
          params: { page, size }
        });
        const postsData = response.data.posts || [];

        const userIds = [...new Set(postsData.map(post => post.user_id))];
        const userProfiles = await Promise.all(
          userIds.map(async id => {
            try {
              const res = await axios.get(`${API_BASE}/echo/user/profile`, {
                params: { user_id: id }
              });
              return { id, profile: res.data };
            } catch {
              return { id, profile: { nickname: '未知用户', avatar_url: 'default-avatar.png' } };
            }
          })
        );

        const userMap = {};
        userProfiles.forEach(({ id, profile }) => {
          userMap[id] = profile;
        });

        const postsWithProfiles = postsData.map(post => ({
          ...post,
          userProfile: userMap[post.user_id] || { nickname: '未知用户', avatar_url: 'default-avatar.png' }
        }));

        setPosts(postsWithProfiles);
        setTotal(response.data.total || 0);
      } catch (error) {
        console.error('获取帖子失败:', error);
        setErrorMsg('加载失败，请稍后重试');
      } finally {
        setLoading(false);
      }
    };
    fetchPosts();
  }, [page, size]);

  const toggleLike = async (postId, liked) => {
    try {
      if (liked) {
        await axios.delete(`${API_BASE}/echo/forum/posts/${postId}/unlike`);
      } else {
        await axios.post(`${API_BASE}/echo/forum/posts/${postId}/like`);
      }

      setPosts(prevPosts =>
        prevPosts.map(post =>
          post.id === postId
            ? {
                ...post,
                liked: !liked,
                likeCount: liked ? post.likeCount - 1 : post.likeCount + 1
              }
            : post
        )
      );
    } catch (error) {
      console.error('点赞操作失败:', error);
    }
  };

  return (
    <div className="forum-page">
      <header className="header">
        <div className="logo-and-name">
          <img src={logo} alt="网站logo" className="logo" />
          <span className="site-name">Echo</span>
        </div>
        <div className="user-and-message">
          <img src="user-avatar.png" alt="用户头像" className="user-avatar" />
          <span className="message-center">消息</span>
        </div>
      </header>

      <nav className="nav">
        <Link to="/friend-moments" className="nav-item">好友动态</Link>
        <Link to="/forum" className="nav-item active">论坛</Link>
        <Link to="/interest-groups" className="nav-item">兴趣小组</Link>
        <Link to="/seed-list" className="nav-item">种子列表</Link>
        <Link to="/publish-seed" className="nav-item">发布种子</Link>
      </nav>

      <div className="forum-content">
        <h2>论坛帖子列表</h2>

        {loading ? (
          <p>加载中...</p>
        ) : errorMsg ? (
          <p className="error-text">{errorMsg}</p>
        ) : posts.length === 0 ? (
          <p>暂无帖子。</p>
        ) : (
          <div className="post-list">
            {posts.map(post => (
              <div key={post.id} className="post-card">
                <div className="post-card-top">
                  <div className="user-info">
                    <img className="avatar" src={post.userProfile.avatar_url} alt="头像" />
                    <span className="nickname">{post.userProfile.nickname}</span>
                  </div>
                  {post.cover_image_url && (
                    <img className="cover-image" src={post.cover_image_url} alt="封面" />
                  )}
                </div>
                <h3>{post.title}</h3>
                <p className="post-meta">
                  发布时间：{new Date(post.created_at).toLocaleString()}
                </p>
                <div className="post-actions">
                  <button
                    className="icon-btn"
                    onClick={() => toggleLike(post.id, post.liked)}
                  >
                    <GoodTwo theme="outline" size="24" fill={post.liked ? '#f00' : '#fff'} />
                    <span>{post.likeCount || 0}</span>
                  </button>
                  <Link href={`/forum/post/${post.id}`} className="icon-btn">
                    <Comment theme="outline" size="24" fill="#fff" />
                    <span>{post.commentCount || 0}</span>
                  </Link>
                </div>
                <Link href={`/forum/post/${post.id}`} className="btn-secondary">查看详情</Link>
              </div>
            ))}
          </div>
        )}

        <div className="pagination">
          <button disabled={page === 1} onClick={() => setPage(page - 1)}>上一页</button>
          <span>第 {page} 页 / 共 {totalPages} 页</span>
          <button disabled={page === totalPages} onClick={() => setPage(page + 1)}>下一页</button>
        </div>
      </div>
    </div>
  );
};

export default ForumPage;