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<?php |
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/** |
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* User: alec |
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* Date: 27.11.18 |
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* Time: 13:33 |
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*/ |
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namespace AlecRabbit\Money; |
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use AlecRabbit\Money\Contracts\CalculatorInterface; |
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class AllocationCalculator |
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{ |
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/** @var string */ |
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protected $amount; |
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/** @var Currency */ |
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protected $currency; |
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/** @var CalculatorInterface */ |
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protected $calculator; |
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/** |
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* AllocationCalculator constructor. |
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* @param Money $param |
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*/ |
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public function __construct(Money $param) |
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{ |
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$this->amount = $param->getAmount(); |
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$this->currency = $param->getCurrency(); |
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$this->calculator = CalculatorFactory::getCalculator(); |
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} |
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public function compute(array $ratios, ?int $precision): array |
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{ |
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$precision = $precision ?? 2; |
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if (0 === $allocations = \count($ratios)) { |
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1 |
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throw new \InvalidArgumentException('Cannot allocate to none, ratios cannot be an empty array.'); |
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} |
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if (0 >= $total = array_sum($ratios)) { |
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throw new \InvalidArgumentException('Sum of ratios must be greater than zero.'); |
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} |
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$remainder = $amount = $this->amount; |
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$results = []; |
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foreach ($ratios as $ratio) { |
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if ($ratio < 0) { |
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throw new \InvalidArgumentException('Ratio must be zero or positive.'); |
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} |
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$share = $this->calculator->share($amount, $ratio, $total, $precision); |
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$results[] = $share; |
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$remainder = $this->calculator->subtract($remainder, $share); |
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} |
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switch ($this->calculator->compare($remainder, '0')) { |
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case -1: |
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for ($i = $allocations - 1; $i >= 0; $i--) { |
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if (!$ratios[$i]) { |
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1 |
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continue; |
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} |
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$results[$i] = $this->calculator->add($results[$i], $remainder); |
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break; |
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} |
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break; |
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case 1: |
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for ($i = 0; $i < $allocations; $i++) { |
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if (!$ratios[$i]) { |
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1 |
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continue; |
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} |
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$results[$i] = $this->calculator->add($results[$i], $remainder); |
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break; |
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} |
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break; |
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default: |
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break; |
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} |
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$computed = []; |
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foreach ($results as $result) { |
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$computed[] = new Money($result, $this->currency); |
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} |
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return $computed; |
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} |
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} |
alecrabbit /
twrb-php-components
