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<?php |
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declare(strict_types = 1); |
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namespace Leaditin\Distribution; |
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use Leaditin\Distribution\Exception\DistributorException; |
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/** |
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* Class Distribution |
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* |
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* @package Leaditin\Distribution |
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* @author Igor Vuckovic <[email protected]> |
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*/ |
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class Distributor |
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{ |
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/** @var array */ |
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private $probabilities; |
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/** @var array */ |
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private $ranges; |
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/** |
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* @param Collection $probabilities |
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* @param int $numberOfElementsToDistribute |
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*/ |
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public function __construct(Collection $probabilities, int $numberOfElementsToDistribute) |
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{ |
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$collection = $this->getNumerifiedCollection($probabilities, $numberOfElementsToDistribute); |
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$this->probabilities = $collection->toArray(); |
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$this->setRanges($collection); |
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} |
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/** |
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* @param array|null $excludeCodes |
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* @return string |
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* @throws DistributorException |
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*/ |
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public function useRandomCode(array $excludeCodes = null) : string |
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{ |
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$eligibleCodes = $this->getEligibleCodes($excludeCodes); |
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if (empty($eligibleCodes)) { |
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throw DistributorException::exceededAllValues(); |
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} |
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$code = $this->randomize($eligibleCodes); |
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$this->probabilities[$code]--; |
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return (string)$code; |
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} |
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/** |
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* @param string $code |
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* @return string |
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* @throws DistributorException |
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*/ |
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public function useCode(string $code) : string |
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{ |
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if (!array_key_exists($code, $this->probabilities)) { |
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throw DistributorException::undefinedCode($code); |
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} |
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if ($this->probabilities[$code] < 1) { |
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throw DistributorException::exceededValuesForCode($code); |
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} |
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$this->probabilities[$code]--; |
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return $code; |
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} |
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/** |
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* @param Collection $collection |
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*/ |
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private function setRanges(Collection $collection) |
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{ |
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$min = 1; |
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$sortedCollection = $this |
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->getNumerifiedCollection($collection, 100) |
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->getSortedCollection(); |
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foreach ($sortedCollection as $element) { |
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if ($element->getValue() === 0.00) { |
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continue; |
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} |
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$max = $min + $element->getValue() - 1; |
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$this->ranges[$element->getCode()] = ['min' => $min, 'max' => $max]; |
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$min = $max + 1; |
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} |
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} |
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/** |
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* @param array|null $excludeCodes |
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* @return array |
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*/ |
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private function getEligibleCodes(array $excludeCodes = null) : array |
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{ |
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$eligibleCodes = []; |
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foreach ($this->probabilities as $code => $value) { |
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if ($value <= 0 || in_array($code, (array)$excludeCodes, true)) { |
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continue; |
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} |
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$eligibleCodes[$code] = $value; |
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} |
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return $eligibleCodes; |
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} |
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/** |
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* @param array $possibleCodes |
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* @return string |
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*/ |
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private function randomize(array $possibleCodes) : string |
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{ |
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$probabilityRanges = array_intersect_key($this->ranges, $possibleCodes); |
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do { |
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$code = $this->getRandomCodeFromRanges($probabilityRanges); |
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} while ($code === false); |
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return (string)$code; |
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} |
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/** |
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* @param array $ranges |
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* @return bool|string |
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*/ |
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private function getRandomCodeFromRanges(array $ranges) |
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{ |
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$int = random_int(1, 100); |
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foreach ($ranges as $code => $range) { |
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if ($int >= $range['min'] && $int <= $range['max']) { |
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return $code; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param Collection $probabilities |
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* @param int $numberOfElementsToDistribute |
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* @return Collection |
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*/ |
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5 |
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private function getNumerifiedCollection(Collection $probabilities, int $numberOfElementsToDistribute) : Collection |
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{ |
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$elements = []; |
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$collection = $probabilities |
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->getToppedUpCollection() |
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->getSortedCollection() |
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->getReversedCollection(); |
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foreach ($collection as $element) { |
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$elements[] = new Element( |
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$element->getCode(), |
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$this->deriveNumericValue($element, $numberOfElementsToDistribute) |
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); |
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} |
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$elements = array_slice($elements, 0, $numberOfElementsToDistribute); |
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return new Collection(...$elements); |
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} |
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/** |
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* @param Element $element |
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* @param int $numberOfElementsToDistribute |
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* @return float |
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*/ |
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private function deriveNumericValue(Element $element, int $numberOfElementsToDistribute) : float |
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{ |
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if ($element->getValue() === 0.00) { |
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return 0; |
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} |
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$value = $numberOfElementsToDistribute * $element->getValue() / 100; |
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return $value < 1 ? 1 : round($value); |
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} |
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} |
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leaditin /
distribution
