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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) 2017-2018, HiQDev (http://hiqdev.com/) |
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*/ |
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namespace hiqdev\php\billing\charge\modifiers\addons; |
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use hiqdev\php\billing\charge\ChargeInterface; |
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use hiqdev\php\billing\charge\modifiers\AddonInterface; |
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use hiqdev\php\billing\formula\FormulaSemanticsError; |
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use Money\Currencies\ISOCurrencies; |
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use Money\Currency; |
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use Money\Money; |
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use Money\Parser\DecimalMoneyParser; |
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/** |
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* Discount addon. |
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* |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class Discount implements AddonInterface |
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{ |
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protected static $name = 'discount'; |
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/** |
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* @var string|Money |
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*/ |
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protected $value; |
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protected $moneyParser; |
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public function __construct($value) |
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{ |
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$this->moneyParser = new DecimalMoneyParser(new ISOCurrencies()); |
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$this->value = $this->ensureValidValue($value); |
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} |
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public function getValue() |
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{ |
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return $this->value; |
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} |
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public function isAbsolute() |
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{ |
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return $this->value instanceof Money; |
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} |
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public function isRelative() |
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{ |
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return !$this->isAbsolute(); |
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} |
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public function ensureValidValue($value) |
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{ |
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if ($value instanceof static) { |
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return $value->getValue(); |
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} |
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if ($value instanceof Money) { |
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return $value; |
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} |
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if (is_numeric($value)) { |
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return (string) $value; |
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} |
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if (is_string($value) && preg_match('/^(\d{1,5}(\.\d+)?)%$/', $value, $ms)) { |
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return $ms[1]; |
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} |
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if (is_string($value) && preg_match('/^(\d{1,5}(\.\d+)?) ([A-Z]{3})$/', $value, $ms)) { |
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return $this->moneyParser->parse($ms[1], new Currency($ms[3])); |
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} |
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$name = static::$name; |
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throw new FormulaSemanticsError("invalid $name value: $value"); |
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} |
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public function multiply($multiplier) |
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{ |
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if (!is_numeric($multiplier)) { |
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throw new FormulaSemanticsError('multiplier for discount must be numeric'); |
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} |
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return new static($this->isAbsolute() ? $this->value->multiply($multiplier) : $this->value*$multiplier); |
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} |
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public function add($addend) |
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{ |
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if (!$addend instanceof self) { |
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$addend = new self($addend); |
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} |
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$this->ensureSameType($addend, 'addend'); |
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if ($this->isAbsolute()) { |
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$sum = $this->value->add($addend->getValue()); |
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} else { |
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$sum = $this->value + $addend->getValue(); |
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} |
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return new static($sum); |
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} |
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public function compare($other) |
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{ |
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if (!$other instanceof self) { |
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$other = new self($other); |
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} |
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$this->ensureSameType($other, 'comparison argument'); |
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if ($this->isAbsolute()) { |
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return $this->value->compare($other->getValue()); |
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} else { |
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return $this->value - $other->getValue(); |
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} |
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} |
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public function ensureSameType(self $other, $name) |
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{ |
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if ($this->isRelative() && !$other->isRelative()) { |
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throw new FormulaSemanticsError("$name must be relative"); |
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} |
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if ($this->isAbsolute() && !$other->isAbsolute()) { |
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throw new FormulaSemanticsError("$name must be absolute"); |
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} |
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} |
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public function calculateSum(ChargeInterface $charge): Money |
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{ |
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return $this->value instanceof Money |
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? $this->value->multiply($charge->getUsage()->getQuantity()) |
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: $charge->getSum()->multiply($this->value * 0.01) |
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; |
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} |
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} |
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hiqdev /
php-billing
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