import { MapperDescriptor } from '../descriptor';
import { InstanceResolver } from './instance-resolver';

/**
 * Implements instanceResolve method for {@see MapperDescriptor.instanceResolve}
 */
export interface InstanceResolveInjector {
  inject(mapperDescriptor: MapperDescriptor, instanceResolver: InstanceResolver): void;
}

/**
 * Default implementation for {@see InstanceResolveInjector} that uses {@see InstanceResolver} to resolve object mapper instance.
 */
export class DefaultInstanceResolveInjector implements InstanceResolveInjector {
  inject(mapperDescriptor: MapperDescriptor, instanceResolver: InstanceResolver): void {
    instanceResolver.register(mapperDescriptor.type, () => new mapperDescriptor.type());
    mapperDescriptor.instanceResolve = () => instanceResolver.resolve(mapperDescriptor);

    for (const useMapper of mapperDescriptor.uses) {
      this.inject(useMapper, instanceResolver);
    }
  }
}