import { HttpException, HttpStatus, Injectable } from '@nestjs/common';
import { CreateSystemDto } from './dto/create-system.dto';
import { UpdateSystemDto } from './dto/update-system.dto';
import { ActivityRepository, KeySystemRepository, UserRepository } from 'src/model/repositories';
import { User } from 'src/model/entitites';
import { IUser } from 'src/model/interface';

@Injectable()
export class SystemService {
  constructor(
    private systemRepo: KeySystemRepository,
    private userRepo: UserRepository,
    private systemActivityRepo: ActivityRepository,
    ) {}

  async create(user: User, createSystemDto: CreateSystemDto) {
    const sys = this.systemRepo.create(createSystemDto);
    sys.managers = [user];
    try {
      const res = await this.systemRepo.save(sys);

      this.systemActivityRepo.save({
        message: `Schließanlage ${(res as any).name} angelegt`,
        user: user,
        system: res
      });

      
      return res;
    } catch (e) {
      throw new HttpException(e.code, HttpStatus.UNPROCESSABLE_ENTITY);
    }
  }

  findAll(user: User) {
    return this.systemRepo.find({
      where: { managers: { id: user.id } },
      order: { name: { direction: 'ASC' } },
    });
  }

  findOne(id: string) {
    return this.systemRepo.findOne({ where: { id: id } });
  }

  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  update(id: string, updateSystemDto: UpdateSystemDto) {
    throw new HttpException(
      `This action updates a #${id} system but is not implemented`,
      HttpStatus.NOT_IMPLEMENTED,
    );
    return `This action updates a #${id} system`;
  }

  async remove(id: string) {
    const system = await this.systemRepo.findOne({ where: { id } });
    return this.systemRepo.softRemove(system);
  }

  async getManagers(id: string) {
    const system = await this.systemRepo.findOne({
      where: { id: id },
      relations: ['managers']
    });

    return system.managers;
  }

  async manageManagers(systemID: string, manageObject: { email: string, action: 'add' | 'remove'}) {
    const sys = await this.systemRepo.findOne({
      where: { id: systemID },
      relations: ['managers']
    });

    if (!sys) {
      throw new HttpException('Das System wurde nicht im System gefunden', HttpStatus.NOT_FOUND);
    }

    if (manageObject.action == 'remove') {
      sys.managers = sys.managers.filter( m => m.username != manageObject.email);

      await this.systemRepo.save(sys);
      return sys.managers;
    }

    if (sys.managers.some(m => m.username == manageObject.email)) {
      return sys.managers;
    }

    const user = await this.userRepo.findOneBy({ username: manageObject.email.trim() });
    if (!user) {
      throw new HttpException('Es wurde kein User mit dieser Emailadresse gefunden. Bitte prüfe die Emailadresse und versuche es erneut.', HttpStatus.NOT_FOUND);
    }

    sys.managers.push(user);
    await this.systemRepo.save(sys);
    return sys.managers;

  }
}