function validateChoice()

in client/components/mma/accountoverview/updateAmount/ContributionUpdateAmountForm.tsx [85:114]

• 30 lines of code
• 10 McCabe index (conditional complexity)

function validateChoice(
	currentAmount: number,
	chosenAmount: number | null,
	minAmount: number,
	maxAmount: number,
	isOtherAmountSelected: boolean,
	mainPlan: PaidSubscriptionPlan,
): string | null {
	const chosenOptionNum = Number(chosenAmount);
	if (!chosenAmount && !isOtherAmountSelected) {
		return 'Please make a selection';
	} else if (chosenOptionNum === currentAmount) {
		return 'You have selected the same amount as you currently contribute';
	} else if (!chosenAmount || isNaN(chosenOptionNum)) {
		return 'There is a problem with the amount you have selected, please make sure it is a valid amount';
	} else if (!isNaN(chosenOptionNum) && chosenOptionNum < minAmount) {
		return `There is a minimum ${
			mainPlan.billingPeriod
		}ly contribution amount of ${mainPlan.currency}${minAmount.toFixed(
			2,
		)} ${mainPlan.currencyISO}`;
	} else if (!isNaN(chosenOptionNum) && chosenOptionNum > maxAmount) {
		return `There is a maximum ${
			mainPlan.billingPeriod
		}ly contribution amount of ${mainPlan.currency}${maxAmount.toFixed(
			2,
		)} ${mainPlan.currencyISO}`;
	}
	return null;
}