AnnuityPaymentAmountCalculator::getPaymentAmounts()

Complexity

Conditions	3
Paths	4

Size

Total Lines	29
Code Lines	19

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	3

Importance

Changes

0

<?php
    public function getPaymentAmounts(
        array $periods,
        float $presentValue,
        float $interestRate,
        float $futureValue = 0.0
    ): array {
        $paymentAmounts = array();

        $discountFactor = 0;
        $futureValueDenominator = 1;

        foreach ($periods as $sequenceNo => $periodsLength) {
            $partialDiscountFactor = pow(1 + ($interestRate / 360 / 100 * $periodsLength),
                -$sequenceNo);

            $discountFactor = $discountFactor + $partialDiscountFactor;

            $partialFutureValueDenominator = 1 + ($interestRate / 360 / 100 * $periodsLength);
            $futureValueDenominator = $futureValueDenominator * $partialFutureValueDenominator;
        }

        $paymentAmount = ($presentValue - ($futureValue / $futureValueDenominator)) / $discountFactor;

        foreach ($periods as $sequenceNo => $periodsLength) {
            $paymentAmounts[$sequenceNo] = $paymentAmount;
        }

        return $paymentAmounts;
    }