import { Injectable } from '@nestjs/common';
import { TypeOrmCrudService } from '@nestjsx/crud-typeorm';
import { Unit } from '../entities/unit.entity';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository, Transaction, TransactionRepository } from 'typeorm';
import { UnitDto } from './unit.dto';

@Injectable()
export class UnitsService extends TypeOrmCrudService<Unit> {
  constructor(
    @InjectRepository(Unit) public unitsRepository: Repository<Unit>,
  ) {
    super(unitsRepository);
  }

  async markDeleted(id: number) {
    await this.unitsRepository.softDelete({ id });
    return;
  }

  @Transaction()
  async bulkUpdate(
    data: Array<Pick<UnitDto, 'id' | 'name' | 'comment'>>,
    @TransactionRepository(Unit) fr?: Repository<Unit>,
  ) {
    const hasUpdatesWithoutId = !!data.find(d => !('id' in d));
    if (hasUpdatesWithoutId)
      return this.throwBadRequestException('id is required');
    const ops = data
      .map(f => {
        const change = Object.keys(f).reduce((c, key) => {
          if (f[key] !== undefined) {
            c[key] = f[key];
          }
          return c;
        }, {});
        return fr.update(f.id, change);
      })
      .filter(r => r instanceof Promise);
    return await Promise.all(ops);
  }
}