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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\charge\modifiers; |
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use DateTimeImmutable; |
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use hiqdev\php\billing\charge\ChargeInterface; |
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use hiqdev\php\billing\charge\modifiers\addons\Discount; |
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use hiqdev\php\billing\charge\modifiers\addons\Maximum; |
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use hiqdev\php\billing\charge\modifiers\addons\Minimum; |
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use hiqdev\php\billing\charge\modifiers\addons\Period; |
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use hiqdev\php\billing\charge\modifiers\addons\Step; |
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use Money\Money; |
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/** |
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* Growing discount. |
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* |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class GrowingDiscount extends FixedDiscount |
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{ |
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const PERIOD = 'period'; |
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const STEP = 'step'; |
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const MIN = 'min'; |
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const MAX = 'max'; |
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public function __construct($step, $min = null, array $addons = []) |
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{ |
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parent::__construct($step, $addons); |
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$this->addAddon(self::STEP, new Step($step)); |
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if ($min) { |
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$this->min($min); |
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} |
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} |
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public function isAbsolute() |
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{ |
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return $this->getStep()->isAbsolute(); |
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} |
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public function getStep(): Step |
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{ |
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return $this->getAddon(self::STEP); |
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} |
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public function getMin() |
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{ |
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return $this->getAddon(self::MIN); |
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} |
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public function getMax() |
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{ |
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if (!$this->hasAddon(self::MAX)) { |
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$this->max('100%'); |
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} |
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return $this->getAddon(self::MAX); |
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} |
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public function min($min) |
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{ |
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$min = new Minimum($min); |
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$this->getStep()->ensureSameType($min, 'minimum'); |
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return $this->addAddon(self::MIN, $min); |
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} |
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public function max($max) |
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{ |
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return $this->addAddon(self::MAX, new Maximum($max)); |
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} |
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public function getPeriod() |
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{ |
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return $this->getAddon(self::PERIOD); |
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} |
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public function every($string = 1) |
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{ |
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return $this->addAddon(self::PERIOD, Period::fromString($string)); |
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} |
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public function calculateSum(ChargeInterface $charge = null): Money |
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{ |
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$sum = parent::calculateSum($charge); |
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if ($this->getMax() !== null) { |
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$max = $this->getMax()->calculateSum($charge); |
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if ($sum->compare($max) > 0) { |
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$sum = $max; |
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} |
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} |
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return $sum; |
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} |
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public function getValue(ChargeInterface $charge = null): Discount |
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{ |
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$time = $charge ? $charge->getAction()->getTime() : new DateTimeImmutable(); |
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$num = (int) $this->countPeriodsPassed($time); |
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return $this->getStep()->calculateFor($num, $this->getMin()); |
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} |
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protected function countPeriodsPassed(DateTimeImmutable $time) |
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{ |
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$since = $this->getSince(); |
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if ($since === null) { |
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throw new \Exception('no since given for growing discount'); |
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} |
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$period = $this->getPeriod(); |
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if ($period === null) { |
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throw new \Exception('no period given for growing discount'); |
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} |
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return $period->countPeriodsPassed($since->getValue(), $time); |
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} |
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} |
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hiqdev /
php-billing
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Let?s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let?s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: