import { type ClassType, isDefined } from '@rnw-community/shared';

import { isValidDecimalMonetaryValue } from './is-valid-decimal-monetary-value.util';

import type { PaymentItem } from '../@standard/w3c/payment-item';
import type { PaymentsError } from '../error/payments.error';

export const validateDisplayItems = (
    displayItems: PaymentItem[] = [],
    ErrorType: ClassType<PaymentsError> = Error
): void => {
    // Check that the value of each display item is a valid decimal monetary value
    displayItems.forEach(item => {
        // TODO: Can we improve this checks?
        if (!isDefined(item) || !isDefined(item.amount) || !isDefined(item.amount.value)) {
            throw new ErrorType(`required member value is undefined.`);
        }

        if (!isValidDecimalMonetaryValue(item.amount.value)) {
            throw new ErrorType(`'${item.amount.value}' is not a valid amount format for display items`);
        }
    });
};