/**
 * 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 { ActivatedRoute, RouterLink } from '@angular/router';
import { UntypedFormBuilder, UntypedFormGroup, Validators } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatDialog } from '@angular/material/dialog';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { Observable } from 'rxjs';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

/** Custom Services */
import { ChequeBookService } from '../chequebook.service';
import { LeafDetailDialogComponent } from './leaf-detail-dialog/leaf-detail-dialog.component';
import { buildChequeIssuanceSlipPdf } from './cheque-issuance-slip-pdf';

type LeafAction = 'stoppayment' | 'revokestoppayment' | 'reportlost' | 'cancelleaf' | 'markused' | 'return';

/**
 * One issued cheque book: its leaf register, and the six leaf-range actions (stop-payment, revoke,
 * report-lost, cancel-leaf, mark-used, return) — each defaults to the whole book when no range is given.
 * "Mark as used" is a manual record (this CBS has no clearing/presentment integration to detect it itself)
 * — a branch sets it once it sees a leaf clear on the bank/clearing statement. "Return" flags a leaf as
 * presented-and-dishonoured (insufficient funds, signature mismatch, etc.) — terminal, like report-lost.
 */
@Component({
  selector: 'mifosx-cheque-book-detail',
  templateUrl: './cheque-book-detail.component.html',
  styleUrls: ['./cheque-book-detail.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    RouterLink,
    MatButtonModule,
    MatSnackBarModule,
    FaIconComponent
  ]
})
export class ChequeBookDetailComponent implements OnInit {
  private route = inject(ActivatedRoute);
  private formBuilder = inject(UntypedFormBuilder);
  private chequeBookService = inject(ChequeBookService);
  private snackBar = inject(MatSnackBar);
  private dialog = inject(MatDialog);

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

  bookId!: string;
  book: any = {};
  leaves: any[] = [];
  busy = false;

  activeAction: LeafAction | null = null;
  actionForm: UntypedFormGroup;

  constructor() {
    this.actionForm = this.formBuilder.group({
      fromLeafSeq: [''],
      toLeafSeq: [''],
      reason: ['']
    });
  }

  ngOnInit(): void {
    this.bookId = this.route.snapshot.paramMap.get('id') as string;
    this.loadAll();
  }

  loadAll(): void {
    this.chequeBookService.getBook(this.bookId).subscribe((data: any) => (this.book = data || {}));
    this.chequeBookService.getLeaves(this.bookId).subscribe((data: any[]) => {
      this.leaves = data || [];
    });
  }

  selectLeaf(leaf: any): void {
    this.dialog.open(LeafDetailDialogComponent, { data: leaf, width: '420px' });
  }

  printIssuanceSlip(): void {
    const doc = buildChequeIssuanceSlipPdf(this.book);
    doc.save(`cheque-book-issuance-${this.book.id}.pdf`);
  }

  startAction(action: LeafAction): void {
    this.activeAction = this.activeAction === action ? null : action;
    this.actionForm.reset();
    const reasonControl = this.actionForm.get('reason');
    if (action === 'revokestoppayment' || action === 'markused') {
      reasonControl?.clearValidators();
    } else {
      reasonControl?.setValidators(Validators.required);
    }
    reasonControl?.updateValueAndValidity();
  }

  submitAction(): void {
    if (this.actionForm.invalid || this.busy || !this.activeAction) {
      return;
    }
    this.busy = true;
    const raw = this.actionForm.value;
    const payload: any = { locale: 'en' };
    if (raw.fromLeafSeq !== '' && raw.fromLeafSeq != null) payload.fromLeafSeq = raw.fromLeafSeq;
    if (raw.toLeafSeq !== '' && raw.toLeafSeq != null) payload.toLeafSeq = raw.toLeafSeq;
    if (raw.reason) payload.reason = raw.reason;

    const actionCalls: Record<LeafAction, (bookId: string, payload: any) => Observable<any>> = {
      stoppayment: (id, p) => this.chequeBookService.stopPayment(id, p),
      revokestoppayment: (id, p) => this.chequeBookService.revokeStopPayment(id, p),
      reportlost: (id, p) => this.chequeBookService.reportBookLost(id, p),
      cancelleaf: (id, p) => this.chequeBookService.cancelLeaf(id, p),
      markused: (id, p) => this.chequeBookService.markUsed(id, p),
      return: (id, p) => this.chequeBookService.returnBook(id, p)
    };
    const call = actionCalls[this.activeAction](this.bookId, payload);

    call.subscribe({
      next: () => {
        this.busy = false;
        this.activeAction = null;
        this.notify('Action applied');
        this.loadAll();
      },
      error: () => {
        this.busy = false;
        this.notify(
          'Action failed — check the leaf range and that the leaves are in a state that allows this action',
          true
        );
      }
    });
  }
}