/**
 * Billing View Model
 *
 * View model for sponsor billing data with UI-specific transformations.
 * Transforms BillingViewData into UI-ready state with formatting and derived fields.
 */
import type { BillingViewData } from '@/lib/view-data/BillingViewData';
import { ViewModel } from "../contracts/view-models/ViewModel";
import { PaymentMethodViewModel } from "./PaymentMethodViewModel";
import { InvoiceViewModel } from "./InvoiceViewModel";
import { BillingStatsViewModel } from "./BillingStatsViewModel";

/**
 * BillingViewModel
 *
 * View Model for sponsor billing data.
 * Transforms BillingViewData into UI-ready state with formatting and derived fields.
 */
export class BillingViewModel extends ViewModel {
  private readonly data: BillingViewData;
  readonly paymentMethods: PaymentMethodViewModel[];
  readonly invoices: InvoiceViewModel[];
  readonly stats: BillingStatsViewModel;

  constructor(data: BillingViewData) {
    super();
    this.data = data;
    this.paymentMethods = data.paymentMethods.map(pm => new PaymentMethodViewModel(pm));
    this.invoices = data.invoices.map(inv => new InvoiceViewModel(inv));
    this.stats = new BillingStatsViewModel(data.stats);
  }
}