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<?php |
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namespace Predictator; |
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use Predictator\AssociationRule\AssociationModel; |
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use Predictator\AssociationRule\AssociationModelInterface; |
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use Predictator\AssociationRule\OrderInterface; |
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use Predictator\AssociationRule\ProductInterface; |
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use Predictator\AssociationRule\Result; |
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class AssociationRule implements AssociationModelInterface |
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{ |
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/** |
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* @var array |
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*/ |
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private $orderMap = []; |
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/** |
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* @var array |
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*/ |
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private $productMap = []; |
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/** |
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* @var ProductInterface[] |
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*/ |
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private $products = []; |
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/** |
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* @param OrderInterface $order |
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*/ |
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public function addOrder(OrderInterface $order) |
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{ |
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$orderId = $order->getId(); |
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if (!$orderId) { |
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throw new \InvalidArgumentException(sprintf('Bad order id: %s', $orderId)); |
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} |
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$this->addArrayIfKeyNotExists($this->orderMap, $orderId); |
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foreach ($order->getOrderProducts() as $orderItem) { |
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$productId = $orderItem->getId(); |
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if (!$productId) { |
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throw new \InvalidArgumentException(sprintf('Bad product id: %s', $productId)); |
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} |
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if (!in_array($productId, $this->orderMap[$orderId])) { |
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$this->orderMap[$orderId][] = $productId; |
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$this->products[$productId] = $orderItem; |
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} |
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$this->addArrayIfKeyNotExists($this->productMap, $productId); |
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if (!in_array($orderId, $this->productMap[$productId])) { |
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$this->productMap[$productId][] = $orderId; |
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} |
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} |
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} |
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/** |
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* @param array $array |
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* @param string $key |
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*/ |
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private function addArrayIfKeyNotExists(array &$array, string $key) |
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{ |
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if (!isset($array[$key])) { |
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$array[$key] = []; |
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} |
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} |
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/** |
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* @param ProductInterface $product |
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* @return array|Result[] |
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*/ |
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public function getResult(ProductInterface $product) : array |
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{ |
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$productId = $product->getId(); |
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$orderIds = $this->getOrderIds($productId); |
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$orderIdsCount = count($orderIds); |
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$ordersProducts = $this->getOrderProducts($orderIds, $productId); |
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$associatedProducts = array(); |
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foreach ($ordersProducts as $orderProductId) { |
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$ratio = (count(array_intersect($this->getOrderIds($orderProductId), $orderIds)) / $orderIdsCount) * 100; |
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if ($ratio) { |
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$associatedProducts[$orderProductId] = $ratio; |
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} |
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} |
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arsort($associatedProducts); |
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$result = []; |
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foreach ($associatedProducts as $productId => $ratio) { |
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$result[] = new Result($this->products[$productId], $ratio); |
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} |
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return $result; |
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} |
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/** |
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* @param string $id |
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* @return array |
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*/ |
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private function getOrderIds(string $id): array |
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{ |
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return $this->productMap[$id] ?? array(); |
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} |
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/** |
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* @param string $id |
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* @return array |
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*/ |
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private function getProductIds(string $id): array |
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{ |
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return $this->orderMap[$id] ?? array(); |
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} |
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/** |
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* @return AssociationModelInterface |
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*/ |
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public function exportModel() : AssociationModelInterface |
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{ |
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$associationModel = $this->getAssociationModel(); |
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foreach ($this->products as $product) { |
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$associationModel->addResult($product, $this->getResult($product)); |
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} |
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return $associationModel; |
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} |
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/** |
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* @param array $orderIds |
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* @param string $productId |
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* @return array |
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*/ |
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private function getOrderProducts(array $orderIds, string $productId): array |
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{ |
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$ordersProducts = []; |
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foreach ($orderIds as $orderId) { |
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$orderProducts = $this->getProductIds($orderId); |
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foreach ($orderProducts as $similarOrderProduct) { |
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if ( |
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!in_array($similarOrderProduct, $ordersProducts) && |
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$productId != $similarOrderProduct |
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) { |
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$ordersProducts[] = $similarOrderProduct; |
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} |
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} |
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} |
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return $ordersProducts; |
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} |
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/** |
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* @return AssociationModel |
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*/ |
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protected function getAssociationModel(): AssociationModel |
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{ |
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return new AssociationModel(); |
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} |
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} |
predictator /
association-rule
