import type { BehaviorAsset } from '../model/Asset';
import type { Project } from '../model/Project';

function firstFree(taken: ReadonlySet<string>, candidate: (i: number) => string, from: number): string {
  for (let i = from; ; i++) {
    const name = candidate(i);
    if (!taken.has(name)) return name;
  }
}

/** "Sprite", "Sprite 2", "Sprite 3" … – the first name not yet used by an asset. */
export function nextAssetName(project: Project, base: string): string {
  const taken = new Set(project.assets.map((a) => a.name));
  return taken.has(base) ? firstFree(taken, (i) => `${base} ${i}`, 2) : base;
}

/** "var1", "var2", … – the first variable name not yet used by the behavior. */
export function nextVariableName(asset: BehaviorAsset, base = 'var'): string {
  return firstFree(new Set(asset.variables.map((v) => v.key)), (i) => `${base}${i}`, 1);
}