/**
 * Copyright since 2025 Mifos Initiative
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/** Angular Imports */
import { Component, OnInit, inject } from '@angular/core';
import { UntypedFormBuilder, UntypedFormGroup, Validators } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatDialogRef, MAT_DIALOG_DATA, MatDialogModule } from '@angular/material/dialog';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

/** Custom Services */
import { NachClearingService } from '../../nachclearing.service';
import { ClearingService } from '../../../clearing-network/clearing.service';
import { clearingError } from '../../../clearing-network/clearing-status';

/** Pass or return a single NACH transaction. Return requires a standardized reason code. */
@Component({
  selector: 'mifosx-nach-txn-decision-dialog',
  templateUrl: './txn-decision-dialog.component.html',
  styleUrls: ['./txn-decision-dialog.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatButtonModule,
    MatDialogModule,
    MatSnackBarModule
  ]
})
export class TxnDecisionDialogComponent implements OnInit {
  dialogRef = inject<MatDialogRef<TxnDecisionDialogComponent>>(MatDialogRef);
  data = inject<{ transaction: any }>(MAT_DIALOG_DATA);
  private formBuilder = inject(UntypedFormBuilder);
  private nachService = inject(NachClearingService);
  private clearingService = inject(ClearingService);
  private snackBar = inject(MatSnackBar);

  decision: 'PASS' | 'RETURN' = 'PASS';
  reasonCodes: any[] = [];
  busy = false;
  form: UntypedFormGroup;

  constructor() {
    this.form = this.formBuilder.group({
      returnReasonCode: [''],
      reason: ['']
    });
  }

  ngOnInit(): void {
    this.clearingService.getReturnReasonCodes('NACH').subscribe((res: any) => {
      this.reasonCodes = Array.isArray(res) ? res : (res?.pageItems ?? []);
    });
  }

  setDecision(decision: 'PASS' | 'RETURN'): void {
    this.decision = decision;
    const rc = this.form.get('returnReasonCode');
    if (decision === 'RETURN') {
      rc?.setValidators([Validators.required]);
    } else {
      rc?.clearValidators();
    }
    rc?.updateValueAndValidity();
  }

  private notify(message: string, isError = false): void {
    this.snackBar.open(message, 'Dismiss', { duration: isError ? 6000 : 3000 });
  }

  submit(): void {
    if (this.busy) {
      return;
    }
    const id = this.data.transaction.id;
    this.busy = true;
    if (this.decision === 'PASS') {
      this.nachService.passTransaction(id).subscribe({
        next: () => this.done('Transaction passed'),
        error: (err: any) => this.fail(err, 'Could not pass the transaction')
      });
    } else {
      if (this.form.invalid) {
        this.busy = false;
        return;
      }
      this.nachService.returnTransaction(id, this.form.value).subscribe({
        next: () => this.done('Transaction returned'),
        error: (err: any) => this.fail(err, 'Could not return the transaction')
      });
    }
  }

  private done(message: string): void {
    this.busy = false;
    this.notify(message);
    this.dialogRef.close({ actioned: true });
  }

  private fail(err: any, fallback: string): void {
    this.busy = false;
    this.notify(clearingError(err, fallback), true);
  }
}