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<?php |
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declare(strict_types=1); |
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namespace MichaelRubel\Couponables\Traits\Concerns; |
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use MichaelRubel\Couponables\Exceptions\InvalidCouponTypeException; |
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use MichaelRubel\Couponables\Exceptions\InvalidCouponValueException; |
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trait CalculatesCosts |
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{ |
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/** |
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* Calculate the output value based on the coupon type. |
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* |
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* @param float $using |
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* |
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* @return float |
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* @throws InvalidCouponTypeException |
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* @throws InvalidCouponValueException |
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*/ |
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public function calc(float $using): float |
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{ |
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$discount = (float) $this->{static::$bindable->getValueColumn()}; |
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if ($this->lessOrEqualZero($discount)) { |
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throw new InvalidCouponValueException; |
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} |
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$result = match ($this->{static::$bindable->getTypeColumn()}) { |
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static::TYPE_SUBTRACTION => static::$bindable->subtract($using, $discount), |
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static::TYPE_PERCENTAGE => static::$bindable->percentage($using, $discount), |
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static::TYPE_FIXED => static::$bindable->fixedPrice($discount), |
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default => throw new InvalidCouponTypeException, |
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}; |
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$rounded = round($result, |
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precision: config('couponables.round') ?? 2, |
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mode: config('couponables.round_mode') ?? PHP_ROUND_HALF_UP |
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); |
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return max($rounded, config('couponables.max') ?? 0); |
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} |
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/** |
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* Apply the "Subtraction" calculation strategy. |
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* |
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* @param float $cost |
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* @param float $discount |
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* |
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* @return float |
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*/ |
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public function subtract(float $cost, float $discount): float |
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{ |
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return $cost - $discount; |
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} |
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/** |
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* Apply the "Percentage" calculation strategy. |
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* |
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* @param float $value |
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* @param float $discount |
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* |
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* @return float |
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*/ |
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public function percentage(float $value, float $discount): float |
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{ |
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return (1.0 - ($discount / 100)) * $value; |
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} |
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/** |
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* Apply the "Fixed Price" calculation strategy. |
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* |
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* @param float $discount |
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* @return float |
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*/ |
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public function fixedPrice(float $discount): float |
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{ |
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return $discount; |
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} |
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/** |
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* @param float $value |
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* @return bool |
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*/ |
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private function lessOrEqualZero(float $value): bool |
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{ |
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return $value <= 0; |
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} |
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} |
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michael-rubel /
laravel-couponables
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