import type { Sprite } from '@/types/sprites';
import { getMaxDimensions } from './useSprites';

/**
 * Calculate negative spacing to add to top-left of cells.
 * Uses half the available space so spacing is equal on all sides.
 */
export function calculateNegativeSpacing(sprites: Sprite[], enabled: boolean): number {
  if (!enabled || sprites.length === 0) return 0;

  const { maxWidth, maxHeight } = getMaxDimensions(sprites);
  const minWidth = Math.min(...sprites.map(s => s.width));
  const minHeight = Math.min(...sprites.map(s => s.height));

  // Available space is the gap between cell size and smallest sprite
  const availableWidth = maxWidth - minWidth;
  const availableHeight = maxHeight - minHeight;

  // Use half to balance spacing equally on all sides
  return Math.floor(Math.min(availableWidth, availableHeight) / 2);
}