react_day_1c/task_2/src/components/FileTree.tsx

import React from 'react';
import { ChevronDown, File, Folder } from 'lucide-react';

interface FileTreeProps {
  onFileSelect: (path: string) => void;
}

export function FileTree({ onFileSelect }: FileTreeProps) {
  const [expandedFolders, setExpandedFolders] = React.useState<Set<string>>(new Set(['src', 'components']));

  const toggleFolder = (folder: string) => {
    setExpandedFolders(prev => {
      const next = new Set(prev);
      if (next.has(folder)) {
        next.delete(folder);
      } else {
        next.add(folder);
      }
      return next;
    });
  };

  return (
    <div className="h-full w-64 bg-[#1E1E1E] text-gray-300 border-r border-gray-800">
      <div
        className="flex items-center gap-2 p-2 text-sm cursor-pointer hover:bg-[#2D2D2D]"
        onClick={() => toggleFolder('src')}
      >
        <span className="flex items-center gap-1">
          <ChevronDown className={`w-4 h-4 transition-transform ${
            expandedFolders.has('src') ? '' : '-rotate-90'
          }`} />
          <Folder className="w-4 h-4" />
          src
        </span>
      </div>
      {expandedFolders.has('src') && <div className="pl-4">
        <div
          className="flex items-center gap-2 p-2 text-sm cursor-pointer hover:bg-[#2D2D2D]"
          onClick={() => toggleFolder('components')}
        >
          <span className="flex items-center gap-1">
            <ChevronDown className={`w-4 h-4 transition-transform ${
              expandedFolders.has('components') ? '' : '-rotate-90'
            }`} />
            <Folder className="w-4 h-4" />
            components
          </span>
        </div>
        {expandedFolders.has('components') && <div className="pl-4">
          <div
            className="flex items-center gap-2 p-2 text-sm text-gray-400 cursor-pointer hover:bg-[#2D2D2D]"
            onClick={() => onFileSelect('/src/components/Chat.tsx')}
          >
            <File className="w-4 h-4" />
            Chat.tsx
          </div>
          <div
            className="flex items-center gap-2 p-2 text-sm text-gray-400 cursor-pointer hover:bg-[#2D2D2D]"
            onClick={() => onFileSelect('/src/components/Editor.tsx')}
          >
            <File className="w-4 h-4" />
            Editor.tsx
          </div>
          <div
            className="flex items-center gap-2 p-2 text-sm text-gray-400 cursor-pointer hover:bg-[#2D2D2D]"
            onClick={() => onFileSelect('/src/components/Prompt.tsx')}
          >
            <File className="w-4 h-4" />
            Prompt.tsx
          </div>
        </div>}
        <div
          className="flex items-center gap-2 p-2 text-sm cursor-pointer hover:bg-[#2D2D2D] bg-[#2D2D2D] border-l-2 border-blue-500"
          onClick={() => onFileSelect('/src/App.tsx')}
        >
          <File className="w-4 h-4" />
          App.tsx
        </div>
      </div>}
    </div>
  );
}