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<?php |
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namespace Pbmedia\Specifications; |
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use Illuminate\Support\Collection; |
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use Pbmedia\Specifications\Interfaces\Attribute; |
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use Pbmedia\Specifications\Interfaces\CanBeSpecified; |
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use Pbmedia\Specifications\Interfaces\Specifications as SpecificationsInterface; |
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use Pbmedia\Specifications\Specifications; |
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class Matcher implements CanBeSpecified |
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{ |
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use HasSpecifications; |
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/** |
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* Collection instance. |
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* |
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* @var \Illuminate\Support\Collection |
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*/ |
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protected $candidates; |
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/** |
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* Create a new Matches instance and instantiates a new Collection. |
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*/ |
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public function __construct() |
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{ |
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$this->candidates = new Collection; |
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} |
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/** |
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* Add an object that implements the CanBeSpecified interface. |
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* |
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* @param \Pbmedia\Specifications\Interfaces\CanBeSpecified $candidate |
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* @return $this |
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*/ |
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public function addCandidate(CanBeSpecified $candidate): Matcher |
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{ |
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$this->candidates->push($candidate); |
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return $this; |
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} |
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/** |
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* Helper method to add multiple candidates at once. |
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* |
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* @param mixed $candidates |
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* @return $this |
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*/ |
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public function addCandidates($candidates): Matcher |
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{ |
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$candidates = is_array($candidates) ? $candidates : func_get_args(); |
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Collection::make($candidates)->each(function ($candidate) { |
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$this->addCandidate($candidate); |
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}); |
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return $this; |
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} |
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/** |
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* Returns a collection containing all candidates. |
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* |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getCandidates(): Collection |
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{ |
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return $this->candidates; |
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} |
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/** |
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* Returns a collection where the keys matches the keys of the |
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* candidates Collection but contain the score of the given |
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* Attribute object. |
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* |
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* @param \Pbmedia\Specifications\Interfaces\Attribute $attribute |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getScoresByAttribute(Attribute $attribute): Collection |
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{ |
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return $this->candidates->map(function (CanBeSpecified $candidate) { |
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return $candidate->specifications(); |
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})->map(function (SpecificationsInterface $specifications) use ($attribute) { |
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if (!$specifications->has($attribute)) { |
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return; |
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} |
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return $specifications->get($attribute)->getScoreValue(); |
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}); |
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} |
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/** |
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* This method does the same as the 'getScoresByAttribute' method |
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* but has the scores normalized. |
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* |
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* @param \Pbmedia\Specifications\Interfaces\Attribute $attribute |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getNormalizedScoresByAttribute(Attribute $attribute): Collection |
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{ |
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$scores = $this->getScoresByAttribute($attribute); |
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$max = $scores->max(); |
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return $scores->map(function ($score) use ($max) { |
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return is_null($score) ? null : ($score / $max); |
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}); |
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} |
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/** |
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* Returns a collection where the keys matches the keys of the |
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* candidates Collection but contain the normalized score compaired |
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* to the given AttributeScore. |
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* |
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* @param \Pbmedia\Specifications\AttributeScore $attributeScore |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function getMatchingScoreByAttributeScore(AttributeScore $attributeScore): Collection |
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{ |
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$attribute = $attributeScore->getAttribute(); |
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$scoreValue = $attributeScore->getScoreValue(); |
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$scores = $this->getScoresByAttribute($attribute); |
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if (!$scores->max()) { |
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return $this->candidates->map(function () { |
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return 0; |
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}); |
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} |
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$scoreToCompareTo = $scoreValue / $scores->max(); |
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return $this->getNormalizedScoresByAttribute($attribute)->map(function ($normalizedScore) use ($scoreToCompareTo) { |
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if ($normalizedScore === null) { |
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return null; |
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} |
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return 1 - abs($normalizedScore - $scoreToCompareTo); |
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}); |
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} |
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/** |
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* Returns a collection where the candidaties are sorted based |
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* on how close they are to the specifications. |
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* |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function get(): Collection |
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{ |
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if ($this->specifications()->all()->isEmpty()) { |
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return $this->getCandidates(); |
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} |
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$scores = []; |
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$this->specifications()->all()->map(function (AttributeScore $attributeScore) { |
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return $this->getMatchingScoreByAttributeScore($attributeScore); |
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})->each(function (Collection $matchingScoreByAttributeScore) use (&$scores) { |
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$matchingScoreByAttributeScore->each(function ($score, $productKey) use (&$scores) { |
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if (!isset($scores[$productKey])) { |
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$scores[$productKey] = 0; |
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} |
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$scores[$productKey] += $score; |
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}); |
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}); |
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return $this->getCandidates()->map(function (CanBeSpecified $candidate, $productKey) use ($scores) { |
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$score = $scores[$productKey]; |
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return compact('candidate', 'score'); |
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})->sortByDesc('score')->map(function ($candidateWithScore): CanBeSpecified { |
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return $candidateWithScore['candidate']; |
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})->values(); |
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} |
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} |
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pascalbaljetmedia /
specifications
