import { Injectable } from "@nestjs/common";
import { User, Cylinder, Key } from "src/model/entitites";
import { KeySystemRepository, CylinderRepository, KeyRepository } from "src/model/repositories";

@Injectable()
export class ManageHelperService {

  constructor(
    private readonly systemRepository: KeySystemRepository,
    private readonly cylinderRepository: CylinderRepository,
    private readonly keyRepo: KeyRepository,
  ) {}


  /**
   * Gibt den Cylinder zurück wenn der user ein Manager ist. Gibt null zurück wenn er nicht existiert oder der 
   * User den Cylinder nicht managen darf.
   * @param user User
   * @param id ID vom Cylinder
   * @returns Cylinder | null
   */
  async getCylinderIfUserCanManage(user: User, id: string, relations: string[] = ['keys', 'system']): Promise<Cylinder> {
    const cylinder = await this.cylinderRepository.findOne({
      where: { id: id, system: { managers: { id: user.id } } },
      relations: relations,
    });
    return cylinder;
  }


  async getUsersKeys(user: User): Promise<Key[]> {
    const keys = await this.keyRepo.find({
      where: { cylinder: { system: { managers: { id: user.id } } } },
      relations: ['cylinder', 'cylinder.system', 'customer'],
    });
    return keys;
  }
}