import { injectable } from "inversify";
import { IResourceMapper, IJsonApiResponse, IJsonApiResource } from "./interfaces";

@injectable()
export default abstract class Mapper<To, From> implements IResourceMapper<To, From> {
  abstract toModel(resource: From, included?:IJsonApiResource[]): To;
  abstract toResource(model: To): From;

  map(resource: IJsonApiResponse<From>) {
    if (Array.isArray(resource.data)) {
      return this.mapMany(resource.data, resource.included);
    }

    return this.mapSingle(resource.data, resource.included);
  }

  private mapMany(resource: From[], included?: IJsonApiResource[]): To[] {
    return resource.map((r) => this.mapSingle(r, included));
  }

  private mapSingle(resource: From, included?: IJsonApiResource[]): To {
    return this.toModel(resource, included);
  }
}