import { useState } from 'react';
import { useDocuments, useCreateDocument, useDeleteDocument, useAnalyzeDocument, useDocumentAnalysis } from '@/hooks/useDocuments';
import { Button } from '@/components/Button';
import { Input } from '@/components/Input';
import { Card } from '@/components/Card';
import { Plus, Trash2, Search, Sparkles, Tag, FolderOpen } from 'lucide-react';
import { useSearchDocuments } from '@/hooks/useDocuments';
import type { Document } from '@/types';

export default function DocumentsPage() {
  const { data: documents } = useDocuments();
  const createDocument = useCreateDocument();
  const deleteDocument = useDeleteDocument();
  const analyzeDocument = useAnalyzeDocument();
  const searchDocuments = useSearchDocuments();
  const [showCreateForm, setShowCreateForm] = useState(false);
  const [searchQuery, setSearchQuery] = useState('');
  const [searchResults, setSearchResults] = useState<Document[]>([]);
  const [analyzingDocs, setAnalyzingDocs] = useState<Set<string>>(new Set());
  const [expandedAnalyses, setExpandedAnalyses] = useState<Set<string>>(new Set());

  const [formData, setFormData] = useState({
    title: '',
    content: '',
  });

  const handleCreate = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      await createDocument.mutateAsync(formData);
      setFormData({ title: '', content: '' });
      setShowCreateForm(false);
    } catch (err: any) {
      alert(err.message || '创建失败');
    }
  };

  const handleDelete = async (id: string) => {
    if (confirm('确定要删除这个文档吗？')) {
      try {
        await deleteDocument.mutateAsync(id);
      } catch (err: any) {
        alert(err.message || '删除失败');
      }
    }
  };

  const handleSearch = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!searchQuery.trim()) {
      setSearchResults([]);
      return;
    }
    try {
      const results = await searchDocuments.mutateAsync(searchQuery);
      setSearchResults(results);
    } catch (err: any) {
      alert(err.message || '搜索失败');
    }
  };

  const handleAnalyze = async (docId: string) => {
    setAnalyzingDocs((prev) => new Set(prev).add(docId));
    try {
      await analyzeDocument.mutateAsync({ id: docId, options: { generate_summary: true } });
      setExpandedAnalyses((prev) => new Set(prev).add(docId));
    } catch (err: any) {
      alert(err.message || 'AI 分析失败，请检查配置');
    } finally {
      setAnalyzingDocs((prev) => {
        const next = new Set(prev);
        next.delete(docId);
        return next;
      });
    }
  };

  const toggleAnalysis = (docId: string) => {
    setExpandedAnalyses((prev) => {
      const next = new Set(prev);
      if (next.has(docId)) {
        next.delete(docId);
      } else {
        next.add(docId);
      }
      return next;
    });
  };

  // DocumentCard 组件
  const DocumentCard = ({ doc }: { doc: Document }) => {
    const { data: analysis } = useDocumentAnalysis(doc.id);
    const isAnalyzing = analyzingDocs.has(doc.id);
    const isExpanded = expandedAnalyses.has(doc.id);

    return (
      <Card variant="bordered" className="flex flex-col">
        <div className="mb-3 flex items-start justify-between">
          <h3 className="text-lg font-semibold text-gray-900 flex-1">
            {doc.title || '无标题'}
          </h3>
          <div className="flex gap-2">
            <button
              onClick={() => handleAnalyze(doc.id)}
              disabled={isAnalyzing}
              className="text-gray-400 hover:text-blue-600 disabled:opacity-50"
              title="AI 分析"
            >
              <Sparkles className={`h-4 w-4 ${isAnalyzing ? 'animate-pulse' : ''}`} />
            </button>
            <button
              onClick={() => handleDelete(doc.id)}
              className="text-gray-400 hover:text-red-600"
              title="删除"
            >
              <Trash2 className="h-4 w-4" />
            </button>
          </div>
        </div>

        <p className="mb-3 line-clamp-3 text-sm text-gray-600 flex-1">
          {doc.content}
        </p>

        {/* AI 分析结果 */}
        {analysis && (
          <div className="mb-3 border-t border-gray-200 pt-3">
            <button
              onClick={() => toggleAnalysis(doc.id)}
              className="flex items-center gap-2 text-sm text-blue-600 hover:text-blue-700"
            >
              <Sparkles className="h-4 w-4" />
              {isExpanded ? '收起' : '查看'} AI 分析
            </button>

            {isExpanded && (
              <div className="mt-3 space-y-2 text-sm">
                {analysis.suggested_tags && analysis.suggested_tags.length > 0 && (
                  <div className="flex items-start gap-2">
                    <Tag className="h-4 w-4 text-gray-500 mt-0.5" />
                    <div className="flex flex-wrap gap-1">
                      {analysis.suggested_tags.map((tag, idx) => (
                        <span
                          key={idx}
                          className="inline-flex items-center rounded-full bg-blue-100 px-2 py-1 text-xs font-medium text-blue-800"
                        >
                          {tag}
                        </span>
                      ))}
                    </div>
                  </div>
                )}

                {analysis.suggested_category && (
                  <div className="flex items-start gap-2">
                    <FolderOpen className="h-4 w-4 text-gray-500 mt-0.5" />
                    <span className="text-gray-600">
                      建议分类: <span className="font-medium text-gray-900">{analysis.suggested_category}</span>
                    </span>
                  </div>
                )}

                {analysis.summary && (
                  <div className="bg-gray-50 rounded p-2 text-gray-700">
                    <span className="font-medium">摘要:</span> {analysis.summary}
                  </div>
                )}

                <p className="text-xs text-gray-500">
                  由 {analysis.provider} ({analysis.model}) 分析
                </p>
              </div>
            )}
          </div>
        )}

        <p className="text-xs text-gray-500">
          {new Date(doc.created_at).toLocaleString()}
        </p>
      </Card>
    );
  };

  const displayDocuments = searchResults.length > 0 ? searchResults : documents;

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">文档管理</h1>
          <p className="mt-1 text-sm text-gray-600">管理您的文档资料</p>
        </div>
        <Button onClick={() => setShowCreateForm(!showCreateForm)}>
          <Plus className="mr-2 h-4 w-4" />
          新建文档
        </Button>
      </div>

      {/* Search */}
      <Card>
        <form onSubmit={handleSearch} className="flex gap-3">
          <Input
            className="flex-1"
            placeholder="搜索文档..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
          />
          <Button type="submit" variant="secondary">
            <Search className="mr-2 h-4 w-4" />
            搜索
          </Button>
        </form>
      </Card>

      {/* Create Form */}
      {showCreateForm && (
        <Card title="新建文档">
          <form onSubmit={handleCreate} className="space-y-4">
            <Input
              label="标题"
              value={formData.title}
              onChange={(e) => setFormData({ ...formData, title: e.target.value })}
              placeholder="文档标题"
            />
            <div>
              <label className="mb-2 block text-sm font-medium text-gray-700">
                内容
              </label>
              <textarea
                className="w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
                rows={6}
                value={formData.content}
                onChange={(e) => setFormData({ ...formData, content: e.target.value })}
                placeholder="文档内容"
                required
              />
            </div>
            <div className="flex justify-end gap-3">
              <Button
                type="button"
                variant="secondary"
                onClick={() => setShowCreateForm(false)}
              >
                取消
              </Button>
              <Button type="submit" loading={createDocument.isPending}>
                创建
              </Button>
            </div>
          </form>
        </Card>
      )}

      {/* Documents List */}
      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
        {displayDocuments?.map((doc) => (
          <DocumentCard key={doc.id} doc={doc} />
        ))}
      </div>

      {displayDocuments?.length === 0 && (
        <Card variant="bordered">
          <p className="text-center text-gray-500">暂无文档</p>
        </Card>
      )}
    </div>
  );
}