import { DragEvent } from 'react';
import { NodeType } from '../../../lib/canvas/schema';

interface PaletteItem {
  type: NodeType;
  label: string;
  icon: string;
  description: string;
}

const PALETTE_ITEMS: PaletteItem[] = [
  { type: 'model', label: 'Model', icon: '📦', description: 'NX model file' },
  { type: 'solver', label: 'Solver', icon: '⚙️', description: 'Nastran solution' },
  { type: 'designVar', label: 'Design Variable', icon: '📐', description: 'Parameter to vary' },
  { type: 'extractor', label: 'Extractor', icon: '🔬', description: 'Physics extraction' },
  { type: 'objective', label: 'Objective', icon: '🎯', description: 'Optimization goal' },
  { type: 'constraint', label: 'Constraint', icon: '🚧', description: 'Limit condition' },
  { type: 'algorithm', label: 'Algorithm', icon: '🧠', description: 'Optimization method' },
  { type: 'surrogate', label: 'Surrogate', icon: '🚀', description: 'Neural acceleration' },
];

export function NodePalette() {
  const onDragStart = (event: DragEvent, nodeType: NodeType) => {
    event.dataTransfer.setData('application/reactflow', nodeType);
    event.dataTransfer.effectAllowed = 'move';
  };

  return (
    <div className="w-64 bg-dark-850 border-r border-dark-700 p-4 overflow-y-auto">
      <h3 className="text-sm font-semibold text-dark-400 uppercase mb-4 tracking-wide">
        Components
      </h3>
      <div className="space-y-2">
        {PALETTE_ITEMS.map((item) => (
          <div
            key={item.type}
            draggable
            onDragStart={(e) => onDragStart(e, item.type)}
            className="flex items-center gap-3 p-3 bg-dark-800 rounded-lg border border-dark-600
                       cursor-grab hover:border-primary-500/50 hover:bg-dark-750 transition-all
                       active:cursor-grabbing"
          >
            <span className="text-xl">{item.icon}</span>
            <div>
              <div className="font-medium text-white">{item.label}</div>
              <div className="text-xs text-dark-400">{item.description}</div>
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}
