/**
 * 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/.
 */

import { Component, OnInit, inject } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatIconModule } from '@angular/material/icon';
import { MatDialogRef, MAT_DIALOG_DATA, MatDialogModule } from '@angular/material/dialog';
import { catchError } from 'rxjs/operators';
import { of } from 'rxjs';

import { ClerkDisbursementService } from '../../cashier/clerk-disbursement.service';

interface CreditEntry {
  accountId?: number;
  accountNo: string;
  accountName: string;
  accountType: string;
  amount: number;
  dbCr?: string;
}

@Component({
  selector: 'mifosx-disbursement-review',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    MatSnackBarModule,
    MatIconModule,
    MatDialogModule
  ],
  templateUrl: './disbursement-review.component.html',
  styleUrl: './disbursement-review.component.scss'
})
export class DisbursementReviewComponent implements OnInit {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private service = inject(ClerkDisbursementService);
  private snackBar = inject(MatSnackBar);
  /** Present only when opened as a popup from the requests list; absent when reached by direct
   *  route (e.g. a bookmarked/shared link). Both entry points stay supported — this only changes
   *  how "done" is signalled: closing the dialog vs. navigating back to the inbox route. */
  private dialogRef = inject(MatDialogRef<DisbursementReviewComponent>, { optional: true });
  private dialogData = inject<{ requestId: number } | null>(MAT_DIALOG_DATA, { optional: true });

  requestId: number | null = null;
  request: any = null;
  creditEntries: CreditEntry[] = [];

  loading = false;
  acting = false;
  showRejectForm = false;
  rejectionReason = '';

  get isDialog(): boolean {
    return !!this.dialogRef;
  }

  ngOnInit(): void {
    if (this.dialogData?.requestId) {
      this.requestId = this.dialogData.requestId;
    } else {
      const id = this.route.snapshot.params['id'];
      this.requestId = id != null ? Number(id) : null;
    }
    if (this.requestId) this.loadRequest();
  }

  loadRequest(): void {
    if (!this.requestId) return;
    this.loading = true;
    this.service
      .getById(this.requestId)
      .pipe(catchError(() => of(null)))
      .subscribe((res: any) => {
        this.request = res;
        this.loading = false;
        if (res?.credit_entries) {
          try {
            const raw: any[] =
              typeof res.credit_entries === 'string' ? JSON.parse(res.credit_entries) : res.credit_entries;
            this.creditEntries = raw.map((e) => ({ ...e, amount: parseFloat(e.amount) || 0 }));
          } catch {
            this.creditEntries = [];
          }
        }
      });
  }

  approve(): void {
    if (!this.requestId || this.acting) return;
    this.acting = true;
    this.service
      .approve(this.requestId)
      .pipe(catchError((err) => of({ error: err?.error?.errors?.[0]?.defaultUserMessage ?? 'Approval failed.' })))
      .subscribe((res: any) => {
        this.acting = false;
        if (res?.error) {
          this.snackBar.open(res.error, 'Close', { duration: 5000 });
        } else {
          const msg = this.isBankTransferMode
            ? 'Bank transfer approved successfully.'
            : this.isFundTransferMode
              ? 'Fund transfer approved successfully.'
              : 'Disbursement approved successfully.';
          this.snackBar.open(msg, 'Close', { duration: 3000 });
          this.finish();
        }
      });
  }

  reject(): void {
    if (!this.requestId || this.acting || !this.rejectionReason.trim()) return;
    this.acting = true;
    this.service
      .reject(this.requestId, this.rejectionReason.trim())
      .pipe(catchError((err) => of({ error: err?.error?.errors?.[0]?.defaultUserMessage ?? 'Rejection failed.' })))
      .subscribe((res: any) => {
        this.acting = false;
        if (res?.error) {
          this.snackBar.open(res.error, 'Close', { duration: 5000 });
        } else {
          this.snackBar.open('Request rejected.', 'Close', { duration: 3000 });
          this.finish();
        }
      });
  }

  /** "Done" for this screen — closes the popup (telling the list to refresh) when opened as a
   *  dialog, or returns to the inbox route otherwise. */
  private finish(): void {
    if (this.dialogRef) {
      this.dialogRef.close({ refreshed: true });
    } else {
      this.router.navigate(['/checker-inbox-and-tasks/disbursement-requests']);
    }
  }

  get isBankTransferMode(): boolean {
    return this.request?.request_type === 'BANK_TRANSFER';
  }

  /** Mechanically identical to a Disbursement (same 1 GL debit -> N account credits flow) — only
   *  the label differs, so a checker doesn't read this as a loan payout. */
  get isFundTransferMode(): boolean {
    return this.request?.request_type === 'FUND_TRANSFER';
  }

  get isCollectionMode(): boolean {
    if (this.isBankTransferMode) return false;
    return this.creditEntries.some((e) => e.dbCr === 'Dr');
  }

  get drEntries(): CreditEntry[] {
    return this.creditEntries.filter((e) => e.dbCr === 'Dr');
  }

  get crEntries(): CreditEntry[] {
    return this.creditEntries.filter((e) => e.dbCr !== 'Dr');
  }

  totalCreditAmount(): number {
    const entries = this.isCollectionMode ? this.drEntries : this.crEntries;
    return entries.reduce((sum, e) => sum + (e.amount ?? 0), 0);
  }

  totalDebitAmount(): number {
    return this.drEntries.reduce((sum, e) => sum + (e.amount ?? 0), 0);
  }

  /**
   * Human-readable account type for the badge. The stored value is the backend's own code
   * (SAVINGS / CURRENT / FIXED_DEPOSIT / RECURRING_DEPOSIT / SHARE / LOAN / GL), so this only
   * changes presentation -- a checker should read "Fixed Deposit", not "FIXED_DEPOSIT".
   */
  accountTypeLabel(accountType: string): string {
    const labels: Record<string, string> = {
      SAVINGS: 'Savings',
      CURRENT: 'Current',
      FIXED_DEPOSIT: 'Fixed Deposit',
      RECURRING_DEPOSIT: 'Recurring Deposit',
      SHARE: 'Share',
      LOAN: 'Loan',
      GL: 'GL'
    };
    return labels[(accountType ?? '').toUpperCase()] ?? accountType;
  }

  statusClass(status: string): string {
    const map: Record<string, string> = {
      PENDING: 'dri-status--pending',
      PROCESSING: 'dri-status--processing',
      APPROVED: 'dri-status--approved',
      REJECTED: 'dri-status--rejected',
      FAILED: 'dri-status--failed'
    };
    return map[status] ?? '';
  }

  formatDateTime(val: any): string {
    if (!val) return '—';
    try {
      const d = new Date(val);
      return d.toLocaleString('en-IN', {
        day: '2-digit',
        month: 'short',
        year: 'numeric',
        hour: '2-digit',
        minute: '2-digit'
      });
    } catch {
      return String(val);
    }
  }

  backToInbox(): void {
    if (this.dialogRef) {
      this.dialogRef.close();
    } else {
      this.router.navigate(['/checker-inbox-and-tasks/disbursement-requests']);
    }
  }
}