import { Injectable, Logger } from '@nestjs/common';
import { SupplierHiboutikRepository } from '../../hiboutik/supplier.hiboutik.repository';
import { SupplierDatabaseRepository } from '../../database/supplier.database.repository';
import { SupplierConverter } from '../../models/converter/supplier.converter';
import { forEachSafely } from '../../utils/sync';

@Injectable()
export class SupplierHiboutikService {
  private readonly logger = new Logger('SupplierHiboutikService');

  constructor(
    private readonly supplierHiboutikRepository: SupplierHiboutikRepository,
    private readonly supplierDatabaseRepository: SupplierDatabaseRepository,
    private readonly supplierConverter: SupplierConverter,
  ) {}

  /** Mirrors Hiboutik suppliers: upserts each of them, then deletes the suppliers missing from Hiboutik. */
  async syncSuppliers() {
    const hiboutikSuppliers = await this.supplierHiboutikRepository.getSuppliers();
    // One upsert per supplier: an invalid supplier must not prevent the others from being saved
    const nbFailed = await forEachSafely(
      this.supplierConverter.fromHiboutikList(hiboutikSuppliers),
      (supplier) => this.supplierDatabaseRepository.upsert(supplier),
      this.logger,
      (supplier) => `Hiboutik supplier ${supplier.hiboutikId}`,
    );

    // Safety net: an empty answer from Hiboutik most likely means an API issue
    if (hiboutikSuppliers.length === 0) {
      this.logger.warn('Hiboutik returned no suppliers: deletion skipped.');
      return;
    }
    const nbDeleted = await this.supplierDatabaseRepository.deleteMissing(hiboutikSuppliers.map((dto) => Number(dto.supplier_id)));
    this.logger.log(
      `Suppliers sync ended: ${hiboutikSuppliers.length - nbFailed}/${hiboutikSuppliers.length} synced, ${nbFailed} failed, ${nbDeleted} deleted.`,
    );
  }
}