feat(nestjs): migrate to NestJS

packages/server/src/modules/BillPayments/commands/BillPaymentGLEntries.ts

@@ -0,0 +1,99 @@
+import { Knex } from 'knex';
+import { BillPaymentGL } from './BillPaymentGL';
+import { Inject, Injectable } from '@nestjs/common';
+import { LedgerStorageService } from '@/modules/Ledger/LedgerStorage.service';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { BillPayment } from '../models/BillPayment';
+import { AccountRepository } from '@/modules/Accounts/repositories/Account.repository';
+import { TenancyContext } from '@/modules/Tenancy/TenancyContext.service';
+import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';
+
+@Injectable()
+export class BillPaymentGLEntries {
+  constructor(
+    private readonly ledgerStorage: LedgerStorageService,
+    private readonly accountRepository: AccountRepository,
+    private readonly tenancyContext: TenancyContext,
+
+    @Inject(BillPayment.name)
+    private readonly billPaymentModel: TenantModelProxy<typeof BillPayment>,
+
+    @Inject(Account.name)
+    private readonly accountModel: TenantModelProxy<typeof Account>,
+  ) {}
+
+  /**
+   * Creates a bill payment GL entries.
+   * @param {number} billPaymentId - Bill payment id.
+   * @param {Knex.Transaction} trx - Knex transaction.
+   */
+  public writePaymentGLEntries = async (
+    billPaymentId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> => {
+    // Retrieves the bill payment details with associated entries.
+    const payment = await this.billPaymentModel()
+      .query(trx)
+      .findById(billPaymentId)
+      .withGraphFetched('entries.bill');
+
+    // Retrieves the given tenant metadata.
+    const tenantMeta = await this.tenancyContext.getTenantMetadata();
+
+    // Finds or creates a new A/P account of the given currency.
+    const APAccount = await this.accountRepository.findOrCreateAccountsPayable(
+      payment.currencyCode,
+      {},
+      trx,
+    );
+    // Exchange gain or loss account.
+    const EXGainLossAccount = await this.accountModel()
+      .query(trx)
+      .modify('findBySlug', 'exchange-grain-loss')
+      .first();
+
+    // Retrieves the bill payment ledger.
+    const ledger = new BillPaymentGL(payment)
+      .setAPAccountId(APAccount.id)
+      .setGainLossAccountId(EXGainLossAccount.id)
+      .setBaseCurrency(tenantMeta.baseCurrency)
+      .getBillPaymentLedger();
+
+    // Commits the ledger on the storage.
+    await this.ledgerStorage.commit(ledger, trx);
+  };
+
+  /**
+   * Rewrites the bill payment GL entries.
+   * @param {number} tenantId
+   * @param {number} billPaymentId
+   * @param {Knex.Transaction} trx
+   */
+  public rewritePaymentGLEntries = async (
+    billPaymentId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> => {
+    // Revert payment GL entries.
+    await this.revertPaymentGLEntries(billPaymentId, trx);
+
+    // Write payment GL entries.
+    await this.writePaymentGLEntries(billPaymentId, trx);
+  };
+
+  /**
+   * Reverts the bill payment GL entries.
+   * @param {number} tenantId
+   * @param {number} billPaymentId
+   * @param {Knex.Transaction} trx
+   */
+  public revertPaymentGLEntries = async (
+    billPaymentId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> => {
+    await this.ledgerStorage.deleteByReference(
+      billPaymentId,
+      'BillPayment',
+      trx,
+    );
+  };
+}