src/app/customers/cases/form/debt-to-income/debt-to-income.component.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 {Component, Input, ViewChild} from '@angular/core';
import {CaseCreditFactorFormComponent} from '../components/credit-factor.component';
import {CreditWorthinessFactor} from '../../../../services/portfolio/domain/individuallending/credit-worthiness-factor.model';

export interface DebtToIncomeFormData {
  incomeSources: CreditWorthinessFactor[];
  debts: CreditWorthinessFactor[];
}

@Component({
  selector: 'fims-case-debt-to-income-form',
  templateUrl: './debt-to-income.component.html'
})
export class CaseDebtToIncomeFormComponent {

  numberFormat = '2.2-2';

  @ViewChild('incomeForm') incomeFactorComponent: CaseCreditFactorFormComponent;
  incomeSources: CreditWorthinessFactor[] = [];

  @ViewChild('debtForm') debtsFactorComponent: CaseCreditFactorFormComponent;
  debts: CreditWorthinessFactor[] = [];

  @Input('formData') set formData(formData: DebtToIncomeFormData) {
    this.incomeSources = formData.incomeSources;
    this.debts = formData.debts;
  }

  constructor() {}

  get formData(): DebtToIncomeFormData {
    return {
      incomeSources: this.incomeFactorComponent.formData,
      debts: this.debtsFactorComponent.formData
    };
  }

  get valid(): boolean {
    return this.incomeFactorComponent.valid && this.debtsFactorComponent.valid;
  }

  get pristine(): boolean {
    return this.incomeFactorComponent.pristine || this.debtsFactorComponent.pristine;
  }

  get ratio(): number {
    return this.divideIfNotZero(this.debtTotal, this.incomeTotal);
  }

  divideIfNotZero(numerator, denominator): number {
    if (denominator === 0 || isNaN(denominator)) {
      return null;
    } else {
      return numerator / denominator;
    }
  }

  get incomeTotal(): number {
    return this.sum(this.formData.incomeSources);
  }

  get debtTotal(): number {
    return this.sum(this.formData.debts);
  }

  private sum(factors: CreditWorthinessFactor[]): number {
    return factors.reduce((acc, val) => acc + parseFloat(val.amount), 0);
  }

}