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import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { X, Download, Trash2 } from "lucide-react";
import { type Citation } from "@shared/schema";

interface CitationPanelProps {
  citations: Citation[];
  isVisible: boolean;
  onClose: () => void;
  onRemoveCitation: (citationId: number) => void;
}

export default function CitationPanel({ 
  citations, 
  isVisible, 
  onClose, 
  onRemoveCitation 
}: CitationPanelProps) {
  if (!isVisible) return null;

  const handleExportCitations = () => {
    const citationText = citations
      .map((citation, index) => {
        return `[${index + 1}] ${citation.citationText}${citation.section ? ` (${citation.section})` : ''}${citation.pageNumber ? ` - Page ${citation.pageNumber}` : ''}`;
      })
      .join('\n\n');

    const blob = new Blob([citationText], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'citations.txt';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
  };

  return (
    <div className="fixed bottom-6 right-6 z-50">
      <div className="bg-white rounded-xl shadow-lg border border-slate-200 w-80 max-h-96 flex flex-col">
        {/* Header */}
        <div className="flex items-center justify-between p-4 border-b border-slate-200">
          <div className="flex items-center gap-2">
            <h4 className="font-medium text-slate-900">Active Citations</h4>
            <Badge variant="secondary" className="text-xs">
              {citations.length}
            </Badge>
          </div>
          <Button
            variant="ghost"
            size="sm"
            onClick={onClose}
            className="text-slate-400 hover:text-slate-600 p-1"
          >
            <X className="w-4 h-4" />
          </Button>
        </div>

        {/* Citations List */}
        <div className="flex-1 overflow-y-auto p-4">
          {citations.length === 0 ? (
            <div className="text-center py-8">
              <div className="text-slate-400 mb-2">
                <svg className="w-8 h-8 mx-auto" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1} d="M9 12h6m-6-4h6m2 5.291A7.962 7.962 0 0112 15c-2.34 0-4.447-.935-6-2.45" />
                </svg>
              </div>
              <p className="text-sm text-slate-500">No citations added yet</p>
              <p className="text-xs text-slate-400 mt-1">
                Click "Add Citation" on search results to build your reference list
              </p>
            </div>
          ) : (
            <div className="space-y-3">
              {citations.map((citation, index) => (
                <div 
                  key={citation.id} 
                  className="group flex items-start gap-3 p-3 bg-slate-50 rounded-lg hover:bg-slate-100 transition-colors"
                >
                  <span className="w-6 h-6 bg-blue-600 text-white rounded-full flex items-center justify-center text-xs font-medium flex-shrink-0 mt-0.5">
                    {index + 1}
                  </span>
                  <div className="flex-1 min-w-0">
                    <p className="text-sm text-slate-700 leading-relaxed line-clamp-3">
                      {citation.citationText}
                    </p>
                    {(citation.section || citation.pageNumber) && (
                      <div className="flex items-center gap-2 mt-2">
                        {citation.section && (
                          <span className="text-xs text-slate-500 bg-white px-2 py-1 rounded">
                            {citation.section}
                          </span>
                        )}
                        {citation.pageNumber && (
                          <span className="text-xs text-slate-500 bg-white px-2 py-1 rounded">
                            Page {citation.pageNumber}
                          </span>
                        )}
                      </div>
                    )}
                  </div>
                  <Button
                    variant="ghost"
                    size="sm"
                    onClick={() => onRemoveCitation(citation.id)}
                    className="opacity-0 group-hover:opacity-100 transition-opacity text-slate-400 hover:text-red-600 p-1"
                  >
                    <Trash2 className="w-3 h-3" />
                  </Button>
                </div>
              ))}
            </div>
          )}
        </div>

        {/* Footer */}
        {citations.length > 0 && (
          <div className="p-4 border-t border-slate-200">
            <Button 
              onClick={handleExportCitations}
              className="w-full bg-slate-100 text-slate-700 hover:bg-slate-200"
              size="sm"
            >
              <Download className="w-4 h-4 mr-2" />
              Export Citations
            </Button>
          </div>
        )}
      </div>
    </div>
  );
}