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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Tax\Model\Calculation;

use Magento\Tax\Api\Data\QuoteDetailsItemInterface;

class UnitBaseCalculator extends AbstractCalculator
{
    /**
     * Determines the rounding operation type and rounds the amount
     *
     * @param float $amount
     * @param string $rate
     * @param bool $direction
     * @param string $type
     * @param bool $round
     * @param QuoteDetailsItemInterface $item
     * @return float|string
     */
    protected function roundAmount(
        $amount,
        $rate = null,
        $direction = null,
        $type = self::KEY_REGULAR_DELTA_ROUNDING,
        $round = true,
        $item = null
    ) {
        if ($item->getAssociatedItemCode()) {
            // Use delta rounding of the product's instead of the weee's
            $type = $type . $item->getAssociatedItemCode();
        } else {
            $type = $type . $item->getCode();
        }

        return $this->deltaRound($amount, $rate, $direction, $type, $round);
    }

    /**
     * Calculate tax details for quote item with tax in price with given quantity
     *
     * @param QuoteDetailsItemInterface $item
     * @param int $quantity
     * @param bool $round
     * @return \Magento\Tax\Api\Data\TaxDetailsItemInterface
     */
    protected function calculateWithTaxInPrice(QuoteDetailsItemInterface $item, $quantity, $round = true)
    {
        $taxRateRequest = $this->getAddressRateRequest()->setProductClassId(
            $this->taxClassManagement->getTaxClassId($item->getTaxClassKey())
        );
        $rate = $this->calculationTool->getRate($taxRateRequest);
        $storeRate = $this->calculationTool->getStoreRate($taxRateRequest, $this->storeId);

        // Calculate $priceInclTax
        $applyTaxAfterDiscount = $this->config->applyTaxAfterDiscount($this->storeId);
        $priceInclTax = $this->calculationTool->round($item->getUnitPrice());
        if (!$this->isSameRateAsStore($rate, $storeRate)) {
            $priceInclTax = $this->calculatePriceInclTax($priceInclTax, $storeRate, $rate, $round);
        }
        $uniTax = $this->calculationTool->calcTaxAmount($priceInclTax, $rate, true, false);
        $deltaRoundingType = self::KEY_REGULAR_DELTA_ROUNDING;
        if ($applyTaxAfterDiscount) {
            $deltaRoundingType = self::KEY_TAX_BEFORE_DISCOUNT_DELTA_ROUNDING;
        }
        $uniTax = $this->roundAmount($uniTax, $rate, true, $deltaRoundingType, $round, $item);
        $price = $priceInclTax - $uniTax;

        //Handle discount
        $discountTaxCompensationAmount = 0;
        $discountAmount = $item->getDiscountAmount();
        if ($applyTaxAfterDiscount) {
            //TODO: handle originalDiscountAmount
            $unitDiscountAmount = $discountAmount / $quantity;
            $taxableAmount = max($priceInclTax - $unitDiscountAmount, 0);
            $unitTaxAfterDiscount = $this->calculationTool->calcTaxAmount(
                $taxableAmount,
                $rate,
                true,
                false
            );
            $unitTaxAfterDiscount = $this->roundAmount(
                $unitTaxAfterDiscount,
                $rate,
                true,
                self::KEY_REGULAR_DELTA_ROUNDING,
                $round,
                $item
            );

            // Set discount tax compensation
            $unitDiscountTaxCompensationAmount = $uniTax - $unitTaxAfterDiscount;
            $discountTaxCompensationAmount = $unitDiscountTaxCompensationAmount * $quantity;
            $uniTax = $unitTaxAfterDiscount;
        }
        $rowTax = $uniTax * $quantity;

        // Calculate applied taxes
        /** @var  \Magento\Tax\Api\Data\AppliedTaxInterface[] $appliedTaxes */
        $appliedRates = $this->calculationTool->getAppliedRates($taxRateRequest);
        $appliedTaxes = $this->getAppliedTaxes($rowTax, $rate, $appliedRates);

        return $this->taxDetailsItemDataObjectFactory->create()
            ->setCode($item->getCode())
            ->setType($item->getType())
            ->setRowTax($rowTax)
            ->setPrice($price)
            ->setPriceInclTax($priceInclTax)
            ->setRowTotal($price * $quantity)
            ->setRowTotalInclTax($priceInclTax * $quantity)
            ->setDiscountTaxCompensationAmount($discountTaxCompensationAmount)
            ->setAssociatedItemCode($item->getAssociatedItemCode())
            ->setTaxPercent($rate)
            ->setAppliedTaxes($appliedTaxes);
    }

    /**
     * Calculate tax details for quote item with tax not in price with given quantity
     *
     * @param QuoteDetailsItemInterface $item
     * @param int $quantity
     * @param bool $round
     * @return \Magento\Tax\Api\Data\TaxDetailsItemInterface
     */
    protected function calculateWithTaxNotInPrice(QuoteDetailsItemInterface $item, $quantity, $round = true)
    {
        $taxRateRequest = $this->getAddressRateRequest()->setProductClassId(
            $this->taxClassManagement->getTaxClassId($item->getTaxClassKey())
        );
        $rate = $this->calculationTool->getRate($taxRateRequest);
        $appliedRates = $this->calculationTool->getAppliedRates($taxRateRequest);

        $applyTaxAfterDiscount = $this->config->applyTaxAfterDiscount($this->storeId);
        $discountAmount = $item->getDiscountAmount();
        $discountTaxCompensationAmount = 0;

        // Calculate $price
        $price = $this->calculationTool->round($item->getUnitPrice());
        $unitTaxes = [];
        $unitTaxesBeforeDiscount = [];
        $appliedTaxes = [];
        //Apply each tax rate separately
        foreach ($appliedRates as $appliedRate) {
            $taxId = $appliedRate['id'];
            $taxRate = $appliedRate['percent'];
            $unitTaxPerRate = $this->calculationTool->calcTaxAmount($price, $taxRate, false, false);
            $deltaRoundingType = self::KEY_REGULAR_DELTA_ROUNDING;
            if ($applyTaxAfterDiscount) {
                $deltaRoundingType = self::KEY_TAX_BEFORE_DISCOUNT_DELTA_ROUNDING;
            }
            $unitTaxPerRate = $this->roundAmount($unitTaxPerRate, $taxId, false, $deltaRoundingType, $round, $item);
            $unitTaxAfterDiscount = $unitTaxPerRate;

            //Handle discount
            if ($applyTaxAfterDiscount) {
                //TODO: handle originalDiscountAmount
                $unitDiscountAmount = $discountAmount / $quantity;
                $taxableAmount = max($price - $unitDiscountAmount, 0);
                $unitTaxAfterDiscount = $this->calculationTool->calcTaxAmount(
                    $taxableAmount,
                    $taxRate,
                    false,
                    false
                );
                $unitTaxAfterDiscount = $this->roundAmount(
                    $unitTaxAfterDiscount,
                    $taxId,
                    false,
                    self::KEY_REGULAR_DELTA_ROUNDING,
                    $round,
                    $item
                );
            }
            $appliedTaxes[$taxId] = $this->getAppliedTax(
                $unitTaxAfterDiscount * $quantity,
                $appliedRate
            );

            $unitTaxes[] = $unitTaxAfterDiscount;
            $unitTaxesBeforeDiscount[] = $unitTaxPerRate;
        }
        $unitTax = array_sum($unitTaxes);
        $unitTaxBeforeDiscount = array_sum($unitTaxesBeforeDiscount);

        $rowTax = $unitTax * $quantity;
        $priceInclTax = $price + $unitTaxBeforeDiscount;

        return $this->taxDetailsItemDataObjectFactory->create()
            ->setCode($item->getCode())
            ->setType($item->getType())
            ->setRowTax($rowTax)
            ->setPrice($price)
            ->setPriceInclTax($priceInclTax)
            ->setRowTotal($price * $quantity)
            ->setRowTotalInclTax($priceInclTax * $quantity)
            ->setDiscountTaxCompensationAmount($discountTaxCompensationAmount)
            ->setAssociatedItemCode($item->getAssociatedItemCode())
            ->setTaxPercent($rate)
            ->setAppliedTaxes($appliedTaxes);
    }
}