utilities getViewportModality.ts

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  import type { IViewport } from '../types/IViewport';
import type IStackViewport from '../types/IStackViewport';
import type IVolumeViewport from '../types/IVolumeViewport';
 
function _getViewportModality(
  viewport: IViewport,
  volumeId?: string,
  getVolume?: (
    volumeId: string
  ) => { metadata: { Modality: string } } | undefined
): string {
  if (!getVolume) {
    throw new Error('getVolume is required, use the utilities export instead ');
  }
 
  if ((viewport as IStackViewport).modality) {
    return (viewport as IStackViewport).modality;
  }
 
  if ((viewport as IVolumeViewport).setVolumes) {
    volumeId = volumeId ?? (viewport as IVolumeViewport).getVolumeId();
 
    if (!volumeId || !getVolume) {
      return;
    }
 
    const volume = getVolume(volumeId);
    return volume.metadata.Modality;
  }
 
  throw new Error('Invalid viewport type');
}
 
export { _getViewportModality };