components/PropertiesPanel.jsx

export default function PropertiesPanel({ selectedNode, onUpdateNode, onDeleteNode }) {
  if (!selectedNode) {
    return (
      <div className="flex flex-col h-full">
        <h2 className="font-semibold mb-4 pb-2 border-b border-border">Properties</h2>
        <div className="flex-1 flex items-center justify-center text-muted text-sm text-center px-4">
          Select a node to configure its parameters.
        </div>
      </div>
    );
  }

  const handleChange = (field, value) => {
    onUpdateNode(selectedNode.id, { [field]: value });
  };

  return (
    <div className="flex flex-col h-full">
      <h2 className="font-semibold mb-4 pb-2 border-b border-border">Properties</h2>
      
      <div className="space-y-4 flex-1 overflow-y-auto pr-2">
        <div className="space-y-1">
          <label className="text-xs text-muted uppercase tracking-wider">Node ID</label>
          <input 
            type="text" 
            value={selectedNode.id} 
            disabled 
            className="w-full bg-surface border border-border rounded px-2 py-1.5 text-sm text-muted cursor-not-allowed"
          />
        </div>

        <div className="space-y-1">
          <label className="text-xs text-muted uppercase tracking-wider">Label</label>
          <input 
            type="text" 
            value={selectedNode.label} 
            onChange={(e) => handleChange('label', e.target.value)}
            className="w-full bg-surface border border-border rounded px-2 py-1.5 text-sm focus:border-primary focus:outline-none transition-colors"
          />
        </div>

        {selectedNode.type === 'llm' && (
          <>
            <div className="space-y-1">
              <label className="text-xs text-muted uppercase tracking-wider">Model</label>
              <select 
                value={selectedNode.model} 
                onChange={(e) => handleChange('model', e.target.value)}
                className="w-full bg-surface border border-border rounded px-2 py-1.5 text-sm focus:border-primary focus:outline-none transition-colors"
              >
                <option value="gpt-4-turbo">GPT-4 Turbo</option>
                <option value="gpt-3.5-turbo">GPT-3.5 Turbo</option>
                <option value="claude-3-opus">Claude 3 Opus</option>
                <option value="llama-3-70b">Llama 3 70B</option>
              </select>
            </div>

            <div className="space-y-1">
              <label className="text-xs text-muted uppercase tracking-wider">Temperature: {selectedNode.temp}</label>
              <input 
                type="range" 
                min="0" 
                max="1" 
                step="0.1" 
                value={selectedNode.temp} 
                onChange={(e) => handleChange('temp', parseFloat(e.target.value))}
                className="w-full accent-primary"
              />
              <div className="flex justify-between text-[10px] text-muted">
                <span>Precise</span>
                <span>Creative</span>
              </div>
            </div>
          </>
        )}

        <div className="space-y-1">
          <label className="text-xs text-muted uppercase tracking-wider">System Prompt</label>
          <textarea 
            value={selectedNode.prompt} 
            onChange={(e) => handleChange('prompt', e.target.value)}
            placeholder="Enter system instructions..."
            className="w-full bg-surface border border-border rounded px-2 py-1.5 text-sm font-mono h-24 focus:border-primary focus:outline-none resize-none transition-colors"
          />
        </div>
      </div>

      <div className="pt-4 border-t border-border mt-4 space-y-2">
        <button 
          onClick={() => onDeleteNode(selectedNode.id)}
          className="w-full py-2 rounded border border-red-900/50 text-red-400 hover:bg-red-900/20 text-sm transition-colors"
        >
          Delete Node
        </button>
      </div>
    </div>
  );
}