fix: Trial balance sheet adjusted balance (#273)

packages/server/src/services/Accounting/Ledger.ts

@@ -1,5 +1,5 @@
 import moment from 'moment';
-import { defaultTo, uniqBy } from 'lodash';
+import { defaultTo, sumBy, uniqBy } from 'lodash';
 import { IAccountTransaction, ILedger, ILedgerEntry } from '@/interfaces';
 
 export default class Ledger implements ILedger {
@@ -49,6 +49,15 @@ export default class Ledger implements ILedger {
     return this.filter((entry) => entry.accountId === accountId);
   }
 
+  /**
+   * Filters entries by the given accounts ids then returns a new ledger.
+   * @param {number[]} accountsIds - Accounts ids.
+   * @returns {ILedger}
+   */
+  public whereAccountsIds(accountsIds: number[]): ILedger {
+    return this.filter((entry) => accountsIds.indexOf(entry.accountId) !== -1);
+  }
+
   /**
    * Filters entries that before or same the given date and returns a new ledger.
    * @param   {Date|string} fromDate
@@ -130,6 +139,22 @@ export default class Ledger implements ILedger {
     return closingBalance;
   }
 
+  /**
+   * Retrieves the closing credit of the entries.
+   * @returns {number}
+   */
+  public getClosingCredit(): number {
+    return sumBy(this.entries, 'credit');
+  }
+
+  /**
+   * Retrieves the closing debit of the entries.
+   * @returns {number}
+   */
+  public getClosingDebit(): number {
+    return sumBy(this.entries, 'debit');
+  }
+
   /**
    * Retrieve the closing balance of the entries.
    * @returns {number}