'use client';

import { useState } from 'react';

interface KnowledgeBaseProps {
  data: any;
  onChange: (data: any) => void;
}

export default function KnowledgeBase({ data, onChange }: KnowledgeBaseProps) {
  const [uploadedFiles, setUploadedFiles] = useState([
    { id: 1, name: '产品手册.pdf', size: '2.4 MB', status: 'uploaded', type: 'pdf', chunks: 45, lastModified: '2024-01-15' },
    { id: 2, name: '常见问题FAQ.docx', size: '856 KB', status: 'uploaded', type: 'docx', chunks: 23, lastModified: '2024-01-14' },
    { id: 3, name: '技术文档.md', size: '1.2 MB', status: 'uploaded', type: 'md', chunks: 67, lastModified: '2024-01-13' },
  ]);

  const [webSources, setWebSources] = useState([
    { id: 1, url: 'https://docs.example.com', title: '官方文档', status: 'crawled', pages: 15, lastUpdate: '2024-01-15' },
    { id: 2, url: 'https://help.example.com', title: '帮助中心', status: 'crawling', pages: 8, lastUpdate: '2024-01-14' }
  ]);

  const [manualContent, setManualContent] = useState('');
  const [newUrl, setNewUrl] = useState('');
  const [activeTab, setActiveTab] = useState('files');
  const [processingSettings, setProcessingSettings] = useState({
    autoChunk: true,
    smartDedup: true,
    generateSummary: false,
    chunkSize: 1000,
    overlap: 200
  });

  const knowledgeBases = [
    { id: 'kb-001', name: '通用知识库', description: '包含基础常识和通用信息', items: 1240, isDefault: true },
    { id: 'kb-002', name: '技术文档库', description: '技术相关的文档和资料', items: 567, isDefault: false },
    { id: 'kb-003', name: '产品说明库', description: '产品相关的说明和手册', items: 892, isDefault: false },
    { id: 'kb-004', name: '客服问答库', description: '客服常见问题和解答', items: 345, isDefault: false }
  ];

  const [selectedKnowledgeBases, setSelectedKnowledgeBases] = useState(['kb-001']);

  const handleFileUpload = (event: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(event.target.files || []);
    const newFiles = files.map((file, index) => ({
      id: uploadedFiles.length + index + 1,
      name: file.name,
      size: `${(file.size / 1024 / 1024).toFixed(1)} MB`,
      status: 'uploading',
      type: file.name.split('.').pop() || 'unknown',
      chunks: 0,
      lastModified: new Date().toISOString().split('T')[0]
    }));
    
    setUploadedFiles([...uploadedFiles, ...newFiles]);
    
    setTimeout(() => {
      setUploadedFiles(prev => prev.map(file => 
        newFiles.some(nf => nf.id === file.id) 
          ? { ...file, status: 'uploaded', chunks: Math.floor(Math.random() * 50) + 10 }
          : file
      ));
    }, 2000);
  };

  const removeFile = (fileId: number) => {
    setUploadedFiles(prev => prev.filter(file => file.id !== fileId));
  };

  const addWebSource = () => {
    if (newUrl) {
      const newSource = {
        id: webSources.length + 1,
        url: newUrl,
        title: '正在获取标题...',
        status: 'crawling',
        pages: 0,
        lastUpdate: new Date().toISOString().split('T')[0]
      };
      setWebSources([...webSources, newSource]);
      setNewUrl('');
      
      setTimeout(() => {
        setWebSources(prev => prev.map(source => 
          source.id === newSource.id 
            ? { ...source, status: 'crawled', title: `${newUrl.split('/')[2]} - 文档`, pages: Math.floor(Math.random() * 20) + 5 }
            : source
        ));
      }, 3000);
    }
  };

  const removeWebSource = (sourceId: number) => {
    setWebSources(prev => prev.filter(source => source.id !== sourceId));
  };

  const toggleKnowledgeBase = (kbId: string) => {
    setSelectedKnowledgeBases(prev => 
      prev.includes(kbId) 
        ? prev.filter(id => id !== kbId)
        : [...prev, kbId]
    );
  };

  const addManualContent = () => {
    if (manualContent.trim()) {
      const newFile = {
        id: uploadedFiles.length + 1,
        name: `手动内容_${new Date().toLocaleTimeString()}`,
        size: `${Math.ceil(manualContent.length / 1024)} KB`,
        status: 'uploaded',
        type: 'text',
        chunks: Math.ceil(manualContent.length / processingSettings.chunkSize),
        lastModified: new Date().toISOString().split('T')[0]
      };
      setUploadedFiles([...uploadedFiles, newFile]);
      setManualContent('');
    }
  };

  return (
    <div className="space-y-8">
      <div>
        <h3 className="text-lg font-semibold text-gray-900 mb-2">知识库配置</h3>
        <p className="text-gray-600 mb-6">为Agent配置知识来源，提升回答的准确性和专业性</p>
        
        <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
          <div className="lg:col-span-2 space-y-6">
            {/* 选择现有知识库 */}
            <div className="bg-white border border-gray-200 rounded-lg p-6">
              <h4 className="font-medium text-gray-900 mb-4">选择现有知识库</h4>
              <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
                {knowledgeBases.map((kb) => (
                  <div
                    key={kb.id}
                    onClick={() => toggleKnowledgeBase(kb.id)}
                    className={`p-4 border rounded-lg cursor-pointer transition-all ${
                      selectedKnowledgeBases.includes(kb.id)
                        ? 'border-blue-500 bg-blue-50'
                        : 'border-gray-200 hover:border-gray-300'
                    }`}
                  >
                    <div className="flex items-start justify-between">
                      <div className="flex-1">
                        <div className="flex items-center space-x-2">
                          <h5 className="font-medium text-gray-900">{kb.name}</h5>
                          {kb.isDefault && (
                            <span className="px-2 py-1 bg-blue-100 text-blue-800 text-xs rounded-full">默认</span>
                          )}
                        </div>
                        <p className="text-sm text-gray-600 mt-1">{kb.description}</p>
                        <p className="text-xs text-gray-500 mt-2">{kb.items.toLocaleString()} 条记录</p>
                      </div>
                      <div className={`w-5 h-5 rounded border-2 flex items-center justify-center ${
                        selectedKnowledgeBases.includes(kb.id)
                          ? 'border-blue-500 bg-blue-500'
                          : 'border-gray-300'
                      }`}>
                        {selectedKnowledgeBases.includes(kb.id) && (
                          <i className="ri-check-line text-white text-xs"></i>
                        )}
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            </div>

            {/* 添加新内容 */}
            <div className="bg-white border border-gray-200 rounded-lg">
              <div className="border-b border-gray-200">
                <div className="flex space-x-0">
                  {[
                    { key: 'files', label: '文件上传', icon: 'ri-file-line' },
                    { key: 'web', label: '网页抓取', icon: 'ri-global-line' },
                    { key: 'manual', label: '手动输入', icon: 'ri-edit-line' }
                  ].map((tab) => (
                    <button
                      key={tab.key}
                      onClick={() => setActiveTab(tab.key)}
                      className={`px-6 py-4 text-sm font-medium border-b-2 transition-colors ${
                        activeTab === tab.key
                          ? 'border-blue-500 text-blue-600 bg-blue-50'
                          : 'border-transparent text-gray-500 hover:text-gray-700'
                      }`}
                    >
                      <div className="w-4 h-4 flex items-center justify-center inline-block mr-2">
                        <i className={tab.icon}></i>
                      </div>
                      {tab.label}
                    </button>
                  ))}
                </div>
              </div>
              
              <div className="p-6">
                {activeTab === 'files' && (
                  <div className="space-y-4">
                    <div className="border-2 border-dashed border-gray-300 rounded-lg p-8 text-center hover:border-gray-400 transition-colors">
                      <div className="w-12 h-12 bg-gray-100 rounded-lg flex items-center justify-center mx-auto mb-4">
                        <i className="ri-upload-cloud-line text-xl text-gray-400"></i>
                      </div>
                      <p className="text-gray-600 mb-2">拖拽文件到此处，或者</p>
                      <label className="inline-block px-4 py-2 bg-blue-600 text-white rounded-lg cursor-pointer hover:bg-blue-700 transition-colors text-sm">
                        选择文件
                        <input
                          type="file"
                          multiple
                          accept=".pdf,.doc,.docx,.txt,.md,.csv,.xlsx"
                          onChange={handleFileUpload}
                          className="hidden"
                        />
                      </label>
                      <p className="text-xs text-gray-500 mt-2">支持 PDF, DOC, DOCX, TXT, MD, CSV, XLSX 格式，最大 50MB</p>
                    </div>
                  </div>
                )}
                
                {activeTab === 'web' && (
                  <div className="space-y-4">
                    <div className="flex space-x-2">
                      <input
                        type="url"
                        placeholder="输入要抓取的网址（如：https://docs.example.com）"
                        value={newUrl}
                        onChange={(e) => setNewUrl(e.target.value)}
                        className="flex-1 px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 text-sm"
                      />
                      <button 
                        onClick={addWebSource}
                        className="px-4 py-3 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors cursor-pointer whitespace-nowrap text-sm"
                      >
                        开始抓取
                      </button>
                    </div>
                    <div className="text-xs text-gray-500">
                      支持抓取文档站点、博客文章、产品页面等，自动提取文本内容
                    </div>
                  </div>
                )}
                
                {activeTab === 'manual' && (
                  <div className="space-y-4">
                    <textarea
                      placeholder="直接输入要添加到知识库的内容...&#10;&#10;例如：&#10;• 产品使用说明&#10;• 常见问题解答&#10;• 操作步骤指南&#10;• 专业知识条目"
                      rows={8}
                      maxLength={500}
                      value={manualContent}
                      onChange={(e) => setManualContent(e.target.value)}
                      className="w-full px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 text-sm resize-none"
                    />
                    <div className="flex items-center justify-between">
                      <div className="text-xs text-gray-500">{manualContent.length}/500 字符</div>
                      <button
                        onClick={addManualContent}
                        disabled={!manualContent.trim()}
                        className="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:bg-gray-400 transition-colors cursor-pointer whitespace-nowrap text-sm"
                      >
                        添加内容
                      </button>
                    </div>
                  </div>
                )}
              </div>
            </div>
          </div>
          
          <div className="space-y-6">
            {/* 已添加内容统计 */}
            <div className="bg-white border border-gray-200 rounded-lg p-4">
              <h4 className="font-medium text-gray-900 mb-3">内容统计</h4>
              <div className="space-y-3">
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-600">文档数量</span>
                  <span className="font-medium text-gray-900">{uploadedFiles.length}</span>
                </div>
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-600">网页来源</span>
                  <span className="font-medium text-gray-900">{webSources.length}</span>
                </div>
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-600">总分块数</span>
                  <span className="font-medium text-gray-900">{uploadedFiles.reduce((sum, file) => sum + file.chunks, 0)}</span>
                </div>
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-600">知识库</span>
                  <span className="font-medium text-gray-900">{selectedKnowledgeBases.length} 个</span>
                </div>
              </div>
            </div>

            {/* 处理设置 */}
            <div className="bg-white border border-gray-200 rounded-lg p-4">
              <h4 className="font-medium text-gray-900 mb-3">处理设置</h4>
              <div className="space-y-4">
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-700">自动分块处理</span>
                  <div 
                    onClick={() => setProcessingSettings(prev => ({...prev, autoChunk: !prev.autoChunk}))}
                    className={`w-10 h-6 rounded-full relative cursor-pointer transition-colors ${
                      processingSettings.autoChunk ? 'bg-blue-600' : 'bg-gray-300'
                    }`}
                  >
                    <div className={`w-4 h-4 bg-white rounded-full absolute top-1 transition-transform ${
                      processingSettings.autoChunk ? 'right-1' : 'left-1'
                    }`}></div>
                  </div>
                </div>
                
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-700">智能去重</span>
                  <div 
                    onClick={() => setProcessingSettings(prev => ({...prev, smartDedup: !prev.smartDedup}))}
                    className={`w-10 h-6 rounded-full relative cursor-pointer transition-colors ${
                      processingSettings.smartDedup ? 'bg-blue-600' : 'bg-gray-300'
                    }`}
                  >
                    <div className={`w-4 h-4 bg-white rounded-full absolute top-1 transition-transform ${
                      processingSettings.smartDedup ? 'right-1' : 'left-1'
                    }`}></div>
                  </div>
                </div>
                
                <div className="flex items-center justify-between">
                  <span className="text-sm text-gray-700">生成摘要</span>
                  <div 
                    onClick={() => setProcessingSettings(prev => ({...prev, generateSummary: !prev.generateSummary}))}
                    className={`w-10 h-6 rounded-full relative cursor-pointer transition-colors ${
                      processingSettings.generateSummary ? 'bg-blue-600' : 'bg-gray-300'
                    }`}
                  >
                    <div className={`w-4 h-4 bg-white rounded-full absolute top-1 transition-transform ${
                      processingSettings.generateSummary ? 'right-1' : 'left-1'
                    }`}></div>
                  </div>
                </div>

                <div className="pt-2 border-t border-gray-200">
                  <div className="mb-3">
                    <label className="block text-sm text-gray-700 mb-1">
                      分块大小: {processingSettings.chunkSize} 字符
                    </label>
                    <input
                      type="range"
                      min="500"
                      max="2000"
                      step="100"
                      value={processingSettings.chunkSize}
                      onChange={(e) => setProcessingSettings(prev => ({...prev, chunkSize: parseInt(e.target.value)}))}
                      className="w-full h-1 bg-gray-200 rounded-lg appearance-none cursor-pointer"
                    />
                  </div>
                  
                  <div>
                    <label className="block text-sm text-gray-700 mb-1">
                      重叠字符: {processingSettings.overlap}
                    </label>
                    <input
                      type="range"
                      min="0"
                      max="500"
                      step="50"
                      value={processingSettings.overlap}
                      onChange={(e) => setProcessingSettings(prev => ({...prev, overlap: parseInt(e.target.value)}))}
                      className="w-full h-1 bg-gray-200 rounded-lg appearance-none cursor-pointer"
                    />
                  </div>
                </div>
              </div>
            </div>
            
            {/* 使用提示 */}
            <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
              <div className="flex items-start space-x-3">
                <div className="w-5 h-5 flex items-center justify-center mt-0.5">
                  <i className="ri-lightbulb-line text-blue-600"></i>
                </div>
                <div>
                  <h4 className="font-medium text-blue-900 mb-2">优化建议</h4>
                  <ul className="text-sm text-blue-800 space-y-1">
                    <li>• 上传结构化的文档获得更好效果</li>
                    <li>• 定期更新知识库内容</li>
                    <li>• 避免重复和冗余信息</li>
                    <li>• 使用标准的文档格式</li>
                  </ul>
                </div>
              </div>
            </div>
          </div>
        </div>

        {/* 已上传文件列表 */}
        {uploadedFiles.length > 0 && (
          <div className="mt-8">
            <h4 className="font-medium text-gray-900 mb-4">已添加的文件</h4>
            <div className="bg-white border border-gray-200 rounded-lg overflow-hidden">
              <div className="divide-y divide-gray-200">
                {uploadedFiles.map((file) => (
                  <div key={file.id} className="p-4 hover:bg-gray-50 transition-colors">
                    <div className="flex items-center justify-between">
                      <div className="flex items-center space-x-4">
                        <div className="w-10 h-10 bg-blue-100 rounded-lg flex items-center justify-center">
                          <i className={`${
                            file.type === 'pdf' ? 'ri-file-pdf-line text-red-600' :
                            file.type === 'docx' ? 'ri-file-word-line text-blue-600' :
                            file.type === 'md' ? 'ri-markdown-line text-purple-600' :
                            'ri-file-text-line text-gray-600'
                          }`}></i>
                        </div>
                        <div className="flex-1">
                          <div className="flex items-center space-x-2">
                            <p className="font-medium text-gray-900">{file.name}</p>
                            {file.status === 'uploading' ? (
                              <span className="px-2 py-1 bg-yellow-100 text-yellow-800 text-xs rounded-full">处理中</span>
                            ) : (
                              <span className="px-2 py-1 bg-green-100 text-green-800 text-xs rounded-full">已完成</span>
                            )}
                          </div>
                          <div className="flex items-center space-x-4 mt-1 text-sm text-gray-500">
                            <span>{file.size}</span>
                            <span>{file.chunks} 个分块</span>
                            <span>修改于 {file.lastModified}</span>
                          </div>
                        </div>
                      </div>
                      <div className="flex items-center space-x-2">
                        {file.status === 'uploading' ? (
                          <div className="w-4 h-4 border-2 border-blue-600 border-t-transparent rounded-full animate-spin"></div>
                        ) : (
                          <button className="p-1 text-gray-400 hover:text-blue-600 transition-colors cursor-pointer">
                            <div className="w-4 h-4 flex items-center justify-center">
                              <i className="ri-eye-line"></i>
                            </div>
                          </button>
                        )}
                        <button
                          onClick={() => removeFile(file.id)}
                          className="p-1 text-gray-400 hover:text-red-600 transition-colors cursor-pointer"
                        >
                          <div className="w-4 h-4 flex items-center justify-center">
                            <i className="ri-delete-bin-line"></i>
                          </div>
                        </button>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        )}

        {/* 网页来源列表 */}
        {webSources.length > 0 && (
          <div className="mt-8">
            <h4 className="font-medium text-gray-900 mb-4">网页来源</h4>
            <div className="bg-white border border-gray-200 rounded-lg overflow-hidden">
              <div className="divide-y divide-gray-200">
                {webSources.map((source) => (
                  <div key={source.id} className="p-4 hover:bg-gray-50 transition-colors">
                    <div className="flex items-center justify-between">
                      <div className="flex items-center space-x-4">
                        <div className="w-10 h-10 bg-green-100 rounded-lg flex items-center justify-center">
                          <i className="ri-global-line text-green-600"></i>
                        </div>
                        <div className="flex-1">
                          <div className="flex items-center space-x-2">
                            <p className="font-medium text-gray-900">{source.title}</p>
                            {source.status === 'crawling' ? (
                              <span className="px-2 py-1 bg-yellow-100 text-yellow-800 text-xs rounded-full">抓取中</span>
                            ) : (
                              <span className="px-2 py-1 bg-green-100 text-green-800 text-xs rounded-full">已完成</span>
                            )}
                          </div>
                          <div className="flex items-center space-x-4 mt-1 text-sm text-gray-500">
                            <span>{source.url}</span>
                            <span>{source.pages} 个页面</span>
                            <span>更新于 {source.lastUpdate}</span>
                          </div>
                        </div>
                      </div>
                      <div className="flex items-center space-x-2">
                        {source.status === 'crawling' ? (
                          <div className="w-4 h-4 border-2 border-blue-600 border-t-transparent rounded-full animate-spin"></div>
                        ) : (
                          <button className="p-1 text-gray-400 hover:text-blue-600 transition-colors cursor-pointer">
                            <div className="w-4 h-4 flex items-center justify-center">
                              <i className="ri-refresh-line"></i>
                            </div>
                          </button>
                        )}
                        <button
                          onClick={() => removeWebSource(source.id)}
                          className="p-1 text-gray-400 hover:text-red-600 transition-colors cursor-pointer"
                        >
                          <div className="w-4 h-4 flex items-center justify-center">
                            <i className="ri-delete-bin-line"></i>
                          </div>
                        </button>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}