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<?php |
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declare(strict_types = 1); |
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namespace Kauri\Loan; |
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/** |
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* Class PaymentPeriods |
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* @package Kauri\Loan |
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*/ |
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class PaymentPeriods implements PaymentPeriodsInterface |
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{ |
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/** |
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* @var array |
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*/ |
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private $periods = array(); |
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/** |
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* @var int |
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*/ |
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private $averagePeriod; |
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/** |
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* PaymentPeriods constructor. |
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* @param int $averagePeriod |
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*/ |
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public function __construct(int $averagePeriod) |
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{ |
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$this->averagePeriod = $averagePeriod; |
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} |
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/** |
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* @param PeriodInterface $period |
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* @param int|null $sequenceNo |
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*/ |
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public function add(PeriodInterface $period, int $sequenceNo = null): void |
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{ |
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if (is_null($sequenceNo)) { |
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$sequenceNo = $this->getNoOfPeriods() + 1; |
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} |
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$period->setSequenceNo($sequenceNo); |
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$this->periods[$sequenceNo] = $period; |
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} |
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/** |
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* @param PeriodInterface $period |
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* @param float $yearlyInterestRate |
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* @param int $calculationType |
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* @param int $calculateFor |
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* @return float |
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* @throws \Exception |
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*/ |
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public function getRatePerPeriod( |
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PeriodInterface $period, |
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float $yearlyInterestRate, |
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int $calculationType = self::CALCULATION_MODE_AVERAGE, |
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int $calculateFor = self::CALCULATE_FOR_INTEREST |
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): float { |
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switch ($calculationType) { |
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case self::CALCULATION_MODE_EXACT: |
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case self::CALCULATION_MODE_EXACT_INTEREST: |
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case self::CALCULATION_MODE_AVERAGE: |
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$currentPeriod = $this->getCurrentPeriod($period, $calculationType, $calculateFor); |
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break; |
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default: |
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throw new \Exception('Calculation type not implemented'); |
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} |
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$ratePerPeriod = $yearlyInterestRate / 360 * $currentPeriod; |
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return $ratePerPeriod; |
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} |
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private function getCurrentPeriod($period, int $calculationType, int $calculateFor) |
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{ |
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if ($calculationType == self::CALCULATION_MODE_EXACT) { |
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return $period->getLength(); |
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} |
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if ($calculateFor == self::CALCULATE_FOR_INTEREST && $calculationType == self::CALCULATION_MODE_EXACT_INTEREST) { |
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return $period->getLength(); |
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} |
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return $this->averagePeriod; |
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} |
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/** |
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* @param PeriodInterface $period |
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* @param int $calculationType |
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* @param int $calculateFor |
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* @return float |
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* @throws \Exception |
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*/ |
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public function getNumberOfPeriods( |
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PeriodInterface $period, |
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int $calculationType = self::CALCULATION_MODE_AVERAGE, |
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int $calculateFor = self::CALCULATE_FOR_PAYMENT |
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): float { |
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switch ($calculationType) { |
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case self::CALCULATION_MODE_EXACT: |
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$currentPeriod = $period->getLength(); |
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$totalPeriods = $this->getExactPeriodsLength(); |
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break; |
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case self::CALCULATION_MODE_EXACT_INTEREST: |
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if ($calculateFor == self::CALCULATE_FOR_PAYMENT) { |
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$currentPeriod = $this->averagePeriod; |
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$totalPeriods = $this->getAveragePeriodsLength(); |
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} else { |
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$currentPeriod = $period->getLength(); |
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$totalPeriods = $this->getExactPeriodsLength(); |
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} |
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break; |
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case self::CALCULATION_MODE_AVERAGE: |
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$currentPeriod = $this->averagePeriod; |
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$totalPeriods = $this->getAveragePeriodsLength(); |
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break; |
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default: |
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throw new \Exception('Calculation type not implemented'); |
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} |
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$numberOfPeriods = $totalPeriods / $currentPeriod; |
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return $numberOfPeriods; |
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} |
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/** |
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* @return int |
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*/ |
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public function getExactPeriodsLength() |
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{ |
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$followingPeriods = $this->getPeriods(); |
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$remainingPeriodsLength = 0; |
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foreach ($followingPeriods as $period) { |
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$remainingPeriodsLength += $period->getLength(); |
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} |
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return $remainingPeriodsLength; |
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} |
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/** |
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* @return int |
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*/ |
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10 |
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public function getAveragePeriodsLength() |
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{ |
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$followingPeriods = $this->getPeriods(); |
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$remainingPeriodsLength = $this->averagePeriod * count($followingPeriods); |
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return $remainingPeriodsLength; |
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} |
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/** |
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* @return array |
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*/ |
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public function getPeriods(): array |
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{ |
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return $this->periods; |
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} |
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/** |
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* @return int |
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*/ |
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public function getNoOfPeriods(): int |
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{ |
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return count($this->periods); |
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} |
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170
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} |
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171
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kaurikk /
loan-payment-period
