import { CreditAdjustment } from './credits';
import { Invoice } from './invoicing';
import { UsageEntry } from './usage';

export function composeStatement(args: {
  customerId: string;
  name?: string;
  veraeUserId?: string;
  prepaidCents: number;
  credits: CreditAdjustment[];
  usage: UsageEntry[];
  invoices: Invoice[];
}) {
  const payments = args.invoices
    .filter((i) => i.customerId === args.customerId && (i.status === 'paid' || i.status === 'issued'))
    .map((i) => ({
      id: i.id,
      customerId: i.customerId,
      cents: i.billableCents,
      kind: i.status === 'paid' ? 'invoice-paid' : 'invoice-issued',
      reason: i.period,
      at: new Date(i.paidAtMs || i.issuedAtMs || Date.now()).toISOString(),
    }));
  return {
    customerId: args.customerId,
    name: args.name,
    veraeUserId: args.veraeUserId,
    prepaidCents: args.prepaidCents,
    credits: args.credits.filter((c) => c.customerId === args.customerId),
    usage: args.usage
      .filter((u) => u.customerId === args.customerId)
      .slice(-50)
      .reverse()
      .map((u) => ({
        customerId: u.customerId,
        endpointId: u.endpointId,
        cents: u.cents,
        at: u.timestamp.toISOString(),
      })),
    payments,
  };
}