import { Injectable, UnprocessableEntityException } from '@nestjs/common';
import { BaseDataService } from 'src/core/modules/data/service/base-data.service';
import { validateRelations } from 'src/core/strings/constants/interface.constants';

@Injectable()
export class ValidateRelationHelper<Entity> {
  constructor(
    private dataId: string,
    private dataService: BaseDataService<Entity>,
    private relations: validateRelations[],
    private tableName: string,
  ) {}

  async execute() {
    const repository = this.dataService.getRepository();
    const queryBuilder = repository.createQueryBuilder(this.tableName);

    // load relation
    for (const relation of this.relations) {
      queryBuilder.loadRelationCountAndMap(
        `${this.tableName}.total_${relation.relation}`,
        `${this.tableName}.${relation.relation}`,
        `total_${relation.relation}`,
      );
    }

    // filtering data only with specific data
    queryBuilder.where(`${this.tableName}.id in ('${this.dataId}')`);

    // get data
    const data = await queryBuilder.getOne();

    // process validasi
    for (const relation of this.relations) {
      const message =
        relation.message ??
        `Failed! this data already connected to ${relation.relation}`;

      if (data[`total_${relation.relation}`])
        throw new UnprocessableEntityException(message);
    }
  }
}