'use client';

import { useEffect, useState, useCallback } from 'react';
import { Skeleton } from '@/components/ui/skeleton';
import { API_BASE } from '@/lib/config';

interface PendingComment {
  id: number;
  content: string;
  status: string;
  createdAt: string;
  user: { id: number; nickname: string; avatar: string | null };
  post: { id: number; title: string };
}

export default function AdminCommentsPage() {
  const [comments, setComments] = useState<PendingComment[]>([]);
  const [loading, setLoading] = useState(true);
  const [tab, setTab] = useState<'pending' | 'approved' | 'rejected'>('pending');

  const base = API_BASE;
  function headers() {
    const t = localStorage.getItem('adminToken');
    return { 'Content-Type': 'application/json', ...(t ? { Authorization: `Bearer ${t}` } : {}) };
  }

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const url = tab === 'pending'
        ? '/admin/comments/pending'
        : tab === 'approved'
          ? '/admin/comments?status=PUBLISHED'
          : '/admin/comments?status=REJECTED';
      const res = await fetch(`${base}${url}`, { headers: headers() });
      if (res.ok) {
        const data = await res.json();
        setComments(data.items || []);
      }
    } catch (e) { console.error(e) }
    setLoading(false);
  }, [tab, base]);

  useEffect(() => { load(); }, [load]);

  async function approve(id: number) {
    try {
      const res = await fetch(`${base}/admin/comments/${id}/approve`, {
        method: 'PUT', headers: headers(),
      });
      if (res.ok) setComments(prev => prev.filter(c => c.id !== id));
    } catch (e) { console.error(e) }
  }

  async function reject(id: number) {
    const reason = prompt('请输入拒绝原因：');
    if (!reason) return;
    try {
      const res = await fetch(`${base}/admin/comments/${id}/reject`, {
        method: 'PUT', headers: headers(), body: JSON.stringify({ reason }),
      });
      if (res.ok) setComments(prev => prev.filter(c => c.id !== id));
    } catch (e) { console.error(e) }
  }

  return (
    <>
      <div className="border-b border-border bg-card px-4 py-4">
        <h1 className="text-2xl font-bold text-foreground">评论审核</h1>
      </div>
      <div className="max-w-4xl mx-auto p-6">
        <div className="flex gap-1 mb-6 bg-muted rounded-lg p-1">
          {(['pending', 'approved', 'rejected'] as const).map(t => (
            <button key={t} onClick={() => setTab(t)}
              className={`flex-1 py-2 text-sm font-medium rounded-md transition-colors ${
                tab === t ? 'bg-card text-foreground shadow-sm' : 'text-muted-foreground hover:text-foreground'
              }`}>
              {t === 'pending' ? '待审核' : t === 'approved' ? '已通过' : '已拒绝'}
            </button>
          ))}
        </div>

        {loading ? (
          <div className="space-y-3">
            {[1,2,3].map(i => (
              <div key={i} className="bg-card rounded-xl border border-border p-4">
                <Skeleton className="h-4 w-32 mb-2" />
                <Skeleton className="h-4 w-full mb-2" />
                <Skeleton className="h-4 w-3/4" />
              </div>
            ))}
          </div>
        ) : comments.length === 0 ? (
          <div className="text-center py-20 text-muted-foreground">
            <p className="text-4xl mb-4">{tab === 'pending' ? '✅' : '📝'}</p>
            <p>{tab === 'pending' ? '暂无待审核评论' : tab === 'approved' ? '暂无已通过评论' : '暂无已拒绝评论'}</p>
          </div>
        ) : (
          <div className="space-y-3">
            {comments.map(c => (
              <div key={c.id} className="bg-card rounded-xl border border-border p-4">
                <div className="flex items-center gap-2 mb-2">
                  <div className="w-7 h-7 rounded-full bg-brand-100 flex items-center justify-center text-brand-600 text-xs font-bold">
                    {c.user.nickname?.[0] || 'U'}
                  </div>
                  <span className="text-sm font-medium text-foreground">{c.user.nickname || '用户'}</span>
                  <span className="text-xs text-muted-foreground">· {new Date(c.createdAt).toLocaleString('zh-CN')}</span>
                </div>
                <p className="text-sm text-foreground mb-2">{c.content}</p>
                <div className="flex items-center justify-between">
                  <a href={`/community/${c.post.id}`} target="_blank"
                    className="text-xs text-brand-600 hover:underline">
                    来源: {c.post.title}
                  </a>
                  {tab === 'pending' && (
                    <div className="flex gap-2">
                      <button onClick={() => approve(c.id)}
                        className="px-3 py-1 text-xs bg-green-600 text-white rounded-lg hover:bg-green-700">
                        通过
                      </button>
                      <button onClick={() => reject(c.id)}
                        className="px-3 py-1 text-xs bg-red-500 text-white rounded-lg hover:bg-red-600">
                        拒绝
                      </button>
                    </div>
                  )}
                </div>
              </div>
            ))}
          </div>
        )}
      </div>
    </>
  );
}
