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<?php |
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/** |
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* PHP Billing Library |
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* |
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* @link https://github.com/hiqdev/php-billing |
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* @package php-billing |
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* @license BSD-3-Clause |
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* @copyright Copyright (c) 2017-2020, HiQDev (http://hiqdev.com/) |
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*/ |
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namespace hiqdev\php\billing\price; |
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use hiqdev\php\billing\plan\PlanInterface; |
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use hiqdev\php\billing\target\TargetInterface; |
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use hiqdev\php\billing\type\TypeInterface; |
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use hiqdev\php\units\Quantity; |
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use hiqdev\php\units\QuantityInterface; |
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use Money\Money; |
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/** |
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* Single Price. |
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* |
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* - no charge for quantity less then prepaid |
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* - same price for any quantity above prepaid |
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* |
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* @see PriceInterface |
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* |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class SinglePrice extends AbstractPrice implements PriceWithQuantityInterface, |
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PriceWithMoneyInterface, |
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PriceWithCurrencyInterface |
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{ |
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use HasMoney; |
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/** |
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* @var QuantityInterface prepaid quantity also implies Unit |
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* XXX cannot be null cause Unit is required |
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*/ |
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protected $prepaid; |
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public function __construct( |
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$id, |
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TypeInterface $type, |
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TargetInterface $target, |
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PlanInterface $plan = null, |
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QuantityInterface $prepaid, |
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Money $price |
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) { |
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parent::__construct($id, $type, $target, $plan); |
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$this->prepaid = $prepaid; |
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$this->price = $price; |
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} |
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public function getPrepaid(): QuantityInterface |
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{ |
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return $this->prepaid; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function calculateUsage(QuantityInterface $quantity): ?QuantityInterface |
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{ |
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$usage = $quantity->convert($this->prepaid->getUnit())->subtract($this->prepaid); |
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if ($usage->isPositive()) { |
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return $usage; |
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} |
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return Quantity::create($this->prepaid->getUnit()->getName(), 0); |
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} |
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/** |
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* {@inheritdoc} |
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* Same price for any usage. |
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*/ |
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public function calculatePrice(QuantityInterface $usage): ?Money |
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{ |
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return $this->price; |
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} |
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} |
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hiqdev /
php-billing
