src/app/accounting/journalEntries/form/journal-entry.validator.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import {FormArray, FormGroup} from '@angular/forms';

export class JournalEntryValidators {

  static minItems(min: number = 1) {
    return (formArray: FormArray): { [key: string]: any } => {
      const minLength = min - 1;
      if (formArray.length <= minLength) {
        return {
          minItemsInvalid: true
        };
      }

      return null;
    };
  }

  static equalSum(firstValue: string, secondValue: string) {
    return (group: FormGroup): { [key: string]: any } => {
      const firstSum: number = this.sum(group.get(firstValue).value);

      const secondSum: number = this.sum(group.get(secondValue).value);

      if (firstSum !== secondSum) {
        return {
          sumInvalid: true
        };
      }

      return null;
    };
  }

  private static sum(accounts: any[]): number {
    let sum = 0;

    for (const account of accounts) {
      sum += parseInt(account.amount, 10);
    }

    return sum;
  }

}