/**
 * 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 { MatIconModule } from '@angular/material/icon';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatSelectModule } from '@angular/material/select';
import { MatInputModule } from '@angular/material/input';
import { of } from 'rxjs';
import { catchError } from 'rxjs/operators';
import { CashierService } from '../cashier.service';

interface Denom {
  id: number;
  value: number;
  kind: 'note' | 'coin';
  label: string;
}
interface Cashier {
  id: number;
  label: string;
}

/** Move cash denomination-wise between two cashiers under the same teller. */
@Component({
  selector: 'mifosx-inter-cashier-transfer',
  templateUrl: './inter-cashier-transfer.component.html',
  styleUrls: ['../cashier-shared.scss'],
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    MatIconModule,
    MatSnackBarModule,
    MatFormFieldModule,
    MatSelectModule,
    MatInputModule
  ]
})
export class InterCashierTransferComponent implements OnInit {
  private service = inject(CashierService);
  private snackBar = inject(MatSnackBar);

  notes: Denom[] = [];
  coins: Denom[] = [];
  counts: Record<number, number> = {};
  transferDate = '';
  note = '';
  saving = false;

  tellers: { id: number; name: string }[] = [];
  allCashiers: Cashier[] = [];
  selectedTellerId: number | null = null;
  fromCashierId: number | null = null;
  toCashierId: number | null = null;
  fromParty = '';
  toParty = '';
  loadingCashiers = false;

  get denoms(): Denom[] {
    return [
      ...this.notes,
      ...this.coins
    ];
  }
  get availableFrom(): Cashier[] {
    return this.allCashiers;
  }
  get availableTo(): Cashier[] {
    return this.allCashiers.filter((c) => c.id !== this.fromCashierId);
  }

  ngOnInit(): void {
    const d = new Date();
    this.transferDate = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
    this.service.getActiveDenominations().subscribe({
      next: (list) => {
        const rows: Denom[] = (list || []).map((x: any) => ({
          id: x.id,
          value: x.denomination,
          kind: x.kind,
          label: '₹' + x.denomination
        }));
        this.notes = rows.filter((r) => r.kind === 'note').sort((a, b) => b.value - a.value);
        this.coins = rows.filter((r) => r.kind === 'coin').sort((a, b) => b.value - a.value);
      },
      error: () => {
        this.notes = [];
        this.coins = [];
      }
    });
    this.service
      .getTellers()
      .pipe(catchError(() => of([] as any[])))
      .subscribe((list) => {
        this.tellers = (list || []).map((t: any) => ({ id: t.id, name: t.name }));
        if (this.tellers.length === 1) {
          this.onTellerSelect(this.tellers[0].id);
        }
      });
  }

  onTellerSelect(tellerId: number): void {
    this.selectedTellerId = tellerId;
    this.fromCashierId = null;
    this.toCashierId = null;
    this.fromParty = '';
    this.toParty = '';
    this.allCashiers = [];
    if (!tellerId) return;
    this.loadingCashiers = true;
    this.service
      .getCashiersForTeller(tellerId)
      .pipe(catchError(() => of({ cashiers: [] })))
      .subscribe((r: any) => {
        this.allCashiers = (r?.cashiers || []).map((c: any) => ({ id: c.id, label: c.staffName }));
        this.loadingCashiers = false;
      });
  }

  onFromSelect(cashierId: number): void {
    this.fromCashierId = cashierId;
    const c = this.allCashiers.find((x) => x.id === cashierId);
    this.fromParty = c ? c.label : '';
    if (this.toCashierId === cashierId) {
      this.toCashierId = null;
      this.toParty = '';
    }
  }

  onToSelect(cashierId: number): void {
    this.toCashierId = cashierId;
    const c = this.allCashiers.find((x) => x.id === cashierId);
    this.toParty = c ? c.label : '';
  }

  countFor(d: Denom): number {
    return this.counts[d.id] || 0;
  }
  subtotal(d: Denom): number {
    return this.countFor(d) * d.value;
  }
  onChange(d: Denom, raw: any): void {
    this.counts[d.id] = Math.max(0, Math.floor(Number(raw) || 0));
  }
  bump(d: Denom, delta: number): void {
    this.counts[d.id] = Math.max(0, (this.counts[d.id] || 0) + delta);
  }

  get total(): number {
    return this.denoms.reduce((s, d) => s + this.subtotal(d), 0);
  }
  get valid(): boolean {
    return this.total > 0 && !!this.selectedTellerId && !!this.fromCashierId && !!this.toCashierId;
  }

  clear(): void {
    this.counts = {};
  }

  submit(): void {
    if (!this.valid || this.saving) return;
    this.saving = true;
    const payload = {
      transferDate: this.transferDate,
      tellerId: this.selectedTellerId,
      fromCashierId: this.fromCashierId,
      toCashierId: this.toCashierId,
      fromParty: this.fromParty.trim(),
      toParty: this.toParty.trim(),
      note: this.note || null,
      denominations: this.denoms
        .filter((d) => this.countFor(d) > 0)
        .map((d) => ({ denominationId: d.id, denominationValue: d.value, count: this.countFor(d) }))
    };
    this.service.createInterCashierTransfer(payload).subscribe({
      next: () => {
        this.snackBar.open('Inter-cashier transfer recorded', 'Close', { duration: 3000 });
        this.clear();
        this.note = '';
        this.fromCashierId = null;
        this.toCashierId = null;
        this.fromParty = '';
        this.toParty = '';
        this.saving = false;
      },
      error: () => {
        this.saving = false;
      }
    });
  }
}