"use client";

import { FileText, ExternalLink, Star, Database, Globe } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";

interface SourceReference {
  title: string;
  filename?: string;
  page?: number;
  score?: number;
  preview: string;
  url?: string;
  source_type?: "web" | "rag";
}

interface SourceReferencesProps {
  sources: SourceReference[];
  maxSources?: number;
}

export default function SourceReferences({ sources, maxSources = 5 }: SourceReferencesProps) {
  if (!sources || sources.length === 0) {
    return null;
  }

  const displaySources = sources.slice(0, maxSources);
  const ragSources = displaySources.filter(s => s.source_type !== "web");
  const webSources = displaySources.filter(s => s.source_type === "web");

  return (
    <div className="mt-4 space-y-3">
      {ragSources.length > 0 && (
        <div className="space-y-2">
          <div className="flex items-center gap-2 text-sm text-blue-600">
            <Database className="h-4 w-4" />
            <span>知识库来源 ({ragSources.length})</span>
          </div>
          
          <div className="space-y-2">
            {ragSources.map((source, index) => (
              <Card key={index} className="border border-blue-200 bg-blue-50/30 hover:border-blue-300 transition-colors">
                <CardHeader className="pb-2">
                  <div className="flex items-start justify-between">
                    <CardTitle className="text-sm font-medium line-clamp-2">
                      {source.title}
                    </CardTitle>
                    {source.score != null && source.score > 0 && source.score < 1 && (
                      <div className="flex items-center gap-1 ml-2">
                        <Star className="h-3 w-3 text-yellow-500" />
                        <span className="text-xs text-gray-500">
                          {(source.score * 100).toFixed(1)}%
                        </span>
                      </div>
                    )}
                  </div>
                  <div className="text-xs text-gray-500">
                    {source.filename}
                    {source.page && ` • 第 ${source.page} 页`}
                  </div>
                </CardHeader>
                <CardContent className="pt-0">
                  <p className="text-xs text-gray-600 line-clamp-2">
                    {source.preview}
                  </p>
                </CardContent>
              </Card>
            ))}
          </div>
        </div>
      )}
      
      {webSources.length > 0 && (
        <div className="space-y-2">
          <div className="flex items-center gap-2 text-sm text-green-600">
            <Globe className="h-4 w-4" />
            <span>网络来源 ({webSources.length})</span>
          </div>
          
          <div className="space-y-2">
            {webSources.map((source, index) => (
              <Card key={index} className="border border-green-200 bg-green-50/30 hover:border-green-300 transition-colors">
                <CardHeader className="pb-2">
                  <CardTitle className="text-sm font-medium line-clamp-2">
                    {source.title}
                  </CardTitle>
                </CardHeader>
                <CardContent className="pt-0">
                  <p className="text-xs text-gray-600 line-clamp-2 mb-2">
                    {source.preview}
                  </p>
                  {source.url && (
                    <Button
                      size="sm"
                      variant="outline"
                      className="h-6 text-xs"
                      onClick={() => window.open(source.url, '_blank')}
                    >
                      <ExternalLink className="h-3 w-3 mr-1" />
                      查看原文
                    </Button>
                  )}
                </CardContent>
              </Card>
            ))}
          </div>
        </div>
      )}
      
      {sources.length > maxSources && (
        <div className="text-xs text-gray-500 text-center">
          还有 {sources.length - maxSources} 个相关来源
        </div>
      )}
    </div>
  );
}