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<?php namespace Bitrix\Sale\Reservation; /** * Calculation of balances based on the reservation history. * * For example: * ```php * $calculator = new \Bitrix\Sale\Reservation\AvailableQuantityCalculator(); * * // load store balance * $rows = StoreProductTable::getList([...]); * foreach ($rows as $row) * { * $calculator->setStoreQuantity($row['STORE_ID'], $row['PRODUCT_ID'], $row['AMOUNT']); * } * * // load history * $rows = BasketReservationHistoryTable::getList([...]); * foreach ($rows as $row) * { * $calculator->addReservationHistory( * $row['STORE_ID'], * $row['PRODUCT_ID'], * $row['BASKET_ID'], * $row['QUANTITY'] * ); * } * * // get count * $calculator->getQuantityForBatch([ * $basketId => $productId, * $basketId => $productId, * // ... * ]); * $calculator->getQuantityForItem($productId, $basketId, $storeId); * ``` / class AvailableQuantityCalculator { /* * Quantity product in stores. * * @var array / private $storeProductQuantity = []; /* * Reservation history (sort is important!). * * @var array / private $reservationHistory = []; /* * Set product store quantity. * * @param int $storeId * @param int $productId * @param float $quantity * @return void / public function setStoreQuantity(int $storeId, int $productId, float $quantity): void { $this->storeProductQuantity[$storeId][$productId] = $quantity; } /* * Add an item reservation history. * The order of addition is IMPORTANT! * * @param int $storeId * @param int $productId * @param int $basketId * @param float $quantity * @return void / public function addReservationHistory(int $storeId, int $productId, int $basketId, float $quantity): void { $this->reservationHistory[] = compact( 'storeId', 'productId', 'basketId', 'quantity', ); } /* * Prepared reservation history. * * Actions: * 1. collapse negative reservations; * * @return array / private function getPreparedReservationHistory(): array { $reverseHistory = array_reverse($this->reservationHistory); $negativeReservations = []; $tmp = []; foreach ($reverseHistory as $item) { $storeId = $item['storeId']; $productId = $item['productId']; $basketId = $item['basketId']; $quantity = $item['quantity']; $key = join("_", [ $storeId, $productId, $basketId, ]); if ($quantity < 0.0) { $negativeReservations[$key] = $negativeReservations[$key] ?? 0.0; $negativeReservations[$key] += abs($quantity); continue; } elseif (isset($negativeReservations[$key])) { $negativeQuantity = $negativeReservations[$key]; if ($negativeQuantity >= $quantity) { $negativeQuantity -= $quantity; if ($negativeQuantity > 0) { $negativeReservations[$key] = $negativeQuantity; } else { unset($negativeReservations[$key]); } continue; } else { $item['quantity'] -= $negativeQuantity; unset($negativeReservations[$key]); } } $tmp[] = $item; } return array_reverse($tmp); } /* * Get available for debit product quantity for store. * * @param int $productId * @param int $basketId * @param int $storeId * @return float / public function getQuantityForItem(int $productId, int $basketId, int $storeId): float { $basketItemsStoreQuantity = $this->getQuantityForBatch([ $basketId => $productId, ]); return $basketItemsStoreQuantity[$basketId][$storeId] ?? 0.0; } /* * Get available for debit product quantity for batch with basket items. * * @param array $basket2productId in format ['basketId' => 'productId', 'basketId' => 'productId', ...] * @return array in format ['basketId' => ['storeId' => 'avaiableQuantity']] */ public function getQuantityForBatch(array $basket2productId): array { $basketItemsStoreQuantity = []; $currentStoreProductQuantity = $this->storeProductQuantity; $preparedReservationHistory = $this->getPreparedReservationHistory(); foreach ($preparedReservationHistory as $item) { $storeId = $item['storeId']; $productId = $item['productId']; $basketId = $item['basketId']; $reservationQuantity = $item['quantity']; $storeQuantity = $currentStoreProductQuantity[$storeId][$productId] ?? 0.0; $isNeedBasketReservation = isset($basket2productId[$basketId]); if ($isNeedBasketReservation) { if ($storeQuantity > 0) { $basketItemsStoreQuantity[$basketId][$storeId] += min($storeQuantity, $reservationQuantity); } } if (isset($currentStoreProductQuantity[$storeId][$productId])) { $currentStoreProductQuantity[$storeId][$productId] -= $reservationQuantity; } } foreach ($basket2productId as $basketId => $productId) { foreach ($currentStoreProductQuantity as $storeId => $quantities) { $storeQuantity = $quantities[$productId] ?? 0.0; if ($storeQuantity > 0.0) { $basketItemsStoreQuantity[$basketId][$storeId] += $storeQuantity; } } } return $basketItemsStoreQuantity; } }

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