/**
 * 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 { MatIconModule } from '@angular/material/icon';
import { MatButtonModule } from '@angular/material/button';
import { MatTableModule } from '@angular/material/table';
import { MatPaginatorModule, PageEvent } from '@angular/material/paginator';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

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

/**
 * CTS view of the shared net-settlement batches — prepared from validated inward batches, posted to the GL
 * or rejected. clearingType is fixed to 'CTS'.
 */
@Component({
  selector: 'mifosx-cts-settlement',
  templateUrl: './settlement.component.html',
  styleUrls: ['./settlement.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatIconModule,
    MatButtonModule,
    MatTableModule,
    MatPaginatorModule,
    MatSnackBarModule,
    FaIconComponent
  ]
})
export class SettlementComponent implements OnInit {
  private formBuilder = inject(UntypedFormBuilder);
  private clearingService = inject(ClearingService);
  private snackBar = inject(MatSnackBar);

  readonly clearingType = 'CTS';
  pillClass = pillClass;

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

  batches: any[] = [];
  totalRecords = 0;
  pageSize = 10;
  pageIndex = 0;
  pageSizeOptions = [
    10,
    25,
    50,
    100
  ];
  statusFilter = '';
  busy = false;

  rejectForId: number | null = null;
  rejectForm: UntypedFormGroup;

  columns = [
    'id',
    'settlementDate',
    'sourceReference',
    'passed',
    'returned',
    'netAmount',
    'status',
    'actions'
  ];

  constructor() {
    this.rejectForm = this.formBuilder.group({
      reason: [
        '',
        Validators.required
      ]
    });
  }

  ngOnInit(): void {
    this.loadBatches();
  }

  loadBatches(): void {
    this.clearingService
      .getSettlementBatches(
        this.clearingType,
        this.statusFilter || undefined,
        this.pageIndex * this.pageSize,
        this.pageSize
      )
      .subscribe((res: any) => {
        this.batches = res?.pageItems ?? (Array.isArray(res) ? res : []);
        this.totalRecords = Number(res?.totalFilteredRecords ?? this.batches.length);
      });
  }

  filterByStatus(status: string): void {
    this.statusFilter = this.statusFilter === status ? '' : status;
    this.pageIndex = 0;
    this.loadBatches();
  }

  onPageChange(event: PageEvent): void {
    this.pageSize = event.pageSize;
    this.pageIndex = event.pageIndex;
    this.loadBatches();
  }

  post(batch: any): void {
    if (this.busy) {
      return;
    }
    this.busy = true;
    this.clearingService.postSettlement(batch.id).subscribe({
      next: () => {
        this.busy = false;
        this.notify('Settlement posted');
        this.loadBatches();
      },
      error: (err: any) => {
        this.busy = false;
        this.notify(clearingError(err, 'Post failed'), true);
      }
    });
  }

  toggleReject(batch: any): void {
    this.rejectForId = this.rejectForId === batch.id ? null : batch.id;
    this.rejectForm.reset();
  }

  submitReject(id: number): void {
    if (this.rejectForm.invalid || this.busy) {
      return;
    }
    this.busy = true;
    this.clearingService.rejectSettlement(id, { reason: this.rejectForm.value.reason, locale: 'en' }).subscribe({
      next: () => {
        this.busy = false;
        this.rejectForId = null;
        this.notify('Settlement rejected');
        this.loadBatches();
      },
      error: (err: any) => {
        this.busy = false;
        this.notify(clearingError(err, 'Reject failed'), true);
      }
    });
  }
}