import {Injectable} from '@angular/core';
import {
  CreateComponentInterfaceGQL,
  CreateComponentInterfaceInput,
  DeleteComponentInterfaceGQL,
  DeleteComponentInterfaceInput,
  GetConsumingComponentsGQL,
  GetConsumingComponentsQuery,
  GetInterfaceGQL,
  GetInterfaceQuery,
  UpdateComponentInterfaceGQL,
  UpdateComponentInterfaceInput
} from '../../../generated/graphql';
import {map} from 'rxjs/operators';
import {Observable} from 'rxjs';

/**
 * This service provides creation, retrievel, update and deletion of interfaces offered by components.
 * The GQL object are generated by the code generator based on interface.graphql in the same directory
 * as this file.
 */
@Injectable({
  providedIn: 'root'
})
export class InterfaceStoreService {
  constructor(
    private createInterfaceMutation: CreateComponentInterfaceGQL,
    private updateInterfaceMutation: UpdateComponentInterfaceGQL,
    private deleteInterfaceMutation: DeleteComponentInterfaceGQL,
    private getInterfaceQuery: GetInterfaceGQL,
    private getConsumingComponentsQuery: GetConsumingComponentsGQL
  ) {}

  public create(name: string, offeringComponentId: string, description?: string): Observable<any> {
    const input: CreateComponentInterfaceInput = {
      name,
      description,
      component: offeringComponentId
    };
    return this.createInterfaceMutation.mutate({input});
  }

  public getInterface(id: string): Observable<GetInterfaceQuery> {
    return this.getInterfaceQuery.fetch({id}).pipe(map(({data}) => data));
  }

  public getConsumingComponents(id: string): Observable<GetConsumingComponentsQuery> {
    return this.getConsumingComponentsQuery.fetch({id}).pipe(map(({data}) => data));
  }

  public update(input: UpdateComponentInterfaceInput): Observable<any> {
    return this.updateInterfaceMutation.mutate({input});
  }

  public delete(id: string): Observable<any> {
    const input: DeleteComponentInterfaceInput = {
      componentInterface: id
    };
    return this.deleteInterfaceMutation.mutate({input});
  }
}