import { type PropertyBag, type PropertyValue, textOf } from '../model/Properties';
import { findPixelFrame } from '../model/pixelart';
import { findAsset, type Project } from '../model/Project';
import { findFrame } from '../model/texture';
import { isKindWith } from './kinds';
import type { PropertyDef } from './PropertySchema';

/**
 * The asset a reference field points at, null when it names nothing or no longer resolves. A frame
 * names the texture or pixel art it was cut from – that is the asset one can open (#221).
 */
export function referencedAssetId(project: Project, def: PropertyDef, value: PropertyValue): string | null {
  if (!isKindWith('reference', def.kind)) return null;
  const id = textOf(value);
  if (id === '') return null;
  if (findAsset(project, id)) return id;
  if (def.kind !== 'texture') return null;
  return findFrame(project, id)?.asset.id ?? findPixelFrame(project, id)?.asset.id ?? null;
}

export interface Reference {
  label: string;
  assetId: string;
}

/** Every reference of a bag that resolves, in schema order – the "Open …" entries of a menu. */
export function referencesOf(
  project: Project,
  schema: readonly PropertyDef[],
  values: PropertyBag,
): Reference[] {
  return schema.flatMap((def) => {
    const value = values[def.key];
    const assetId = value === undefined ? null : referencedAssetId(project, def, value);
    return assetId ? [{ label: def.label, assetId }] : [];
  });
}