feat: export purchases by items to csv/xlsx (#327)

packages/server/src/services/FinancialStatements/PurchasesByItems/PurchasesByItemsExport.ts

@@ -0,0 +1,46 @@
+import { Inject, Service } from 'typedi';
+import { TableSheet } from '@/lib/Xlsx/TableSheet';
+import { PurchasesByItemsTableInjectable } from './PurchasesByItemsTableInjectable';
+import { IPurchasesByItemsReportQuery } from '@/interfaces/PurchasesByItemsSheet';
+
+@Service()
+export class PurchasesByItemsExport {
+  @Inject()
+  private purchasesByItemsTable: PurchasesByItemsTableInjectable;
+
+  /**
+   * Retrieves the purchases by items sheet in XLSX format.
+   * @param {number} tenantId
+   * @param {IPurchasesByItemsReportQuery} query
+   * @returns {Promise<Buffer>}
+   */
+  public async xlsx(
+    tenantId: number,
+    query: IPurchasesByItemsReportQuery
+  ): Promise<Buffer> {
+    const table = await this.purchasesByItemsTable.table(tenantId, query);
+
+    const tableSheet = new TableSheet(table.table);
+    const tableCsv = tableSheet.convertToXLSX();
+
+    return tableSheet.convertToBuffer(tableCsv, 'xlsx');
+  }
+
+  /**
+   * Retrieves the purchases by items sheet in CSV format.
+   * @param {number} tenantId
+   * @param {IPurchasesByItemsReportQuery} query
+   * @returns {Promise<Buffer>}
+   */
+  public async csv(
+    tenantId: number,
+    query: IPurchasesByItemsReportQuery
+  ): Promise<string> {
+    const table = await this.purchasesByItemsTable.table(tenantId, query);
+
+    const tableSheet = new TableSheet(table.table);
+    const tableCsv = tableSheet.convertToCSV();
+
+    return tableCsv;
+  }
+}