export type WalletTransactionStats = {
  netAmount?: string;
  byType?: Array<{ transactionType?: string; totalAmount?: string }>;
};

const CASHBACK_TYPES = new Set(['CASHBACK', 'CASHBACK_DEPOSIT']);

/** Sum wallet credits from cashback transaction types (matches WalletDetailView fallback). */
export function sumCashbackFromStats(stats: WalletTransactionStats | null | undefined): number {
  let sum = 0;
  for (const group of stats?.byType ?? []) {
    const type = group.transactionType?.toUpperCase() ?? '';
    if (CASHBACK_TYPES.has(type)) {
      sum += Math.abs(parseFloat(group.totalAmount ?? '0') || 0);
    }
  }
  return sum;
}