<?php

declare(strict_types=1);

/*
 * CoreShop
 *
 * This source file is available under two different licenses:
 *  - GNU General Public License version 3 (GPLv3)
 *  - CoreShop Commercial License (CCL)
 * Full copyright and license information is available in
 * LICENSE.md which is distributed with this source code.
 *
 * @copyright  Copyright (c) CoreShop GmbH (https://www.coreshop.org)
 * @license    https://www.coreshop.org/license     GPLv3 and CCL
 *
 */

namespace CoreShop\Component\Core\ProductQuantityPriceRules\Calculator;

use CoreShop\Component\Core\Model\QuantityRangeInterface as CoreQuantityRangeInterface;
use CoreShop\Component\Product\Model\ProductInterface;
use CoreShop\Component\Product\Model\ProductUnitDefinitionInterface;
use CoreShop\Component\ProductQuantityPriceRules\Calculator\CalculatorInterface;
use CoreShop\Component\ProductQuantityPriceRules\Calculator\VolumeCalculator;
use CoreShop\Component\ProductQuantityPriceRules\Exception\NoPriceFoundException;
use CoreShop\Component\ProductQuantityPriceRules\Model\ProductQuantityPriceRuleInterface;
use CoreShop\Component\ProductQuantityPriceRules\Model\QuantityRangeInterface;
use CoreShop\Component\ProductQuantityPriceRules\Model\QuantityRangePriceAwareInterface;
use CoreShop\Component\Registry\ServiceRegistryInterface;
use Doctrine\Common\Collections\Collection;

class UnitVolumeCalculator implements CalculatorInterface
{
    public function __construct(
        protected VolumeCalculator $inner,
        protected ServiceRegistryInterface $actionRegistry,
    ) {
    }

    public function calculateForQuantity(
        ProductQuantityPriceRuleInterface $quantityPriceRule,
        QuantityRangePriceAwareInterface $subject,
        float $quantity,
        int $originalPrice,
        array $context,
    ): int {
        if (!isset($context['unitDefinition']) || !$context['unitDefinition'] instanceof ProductUnitDefinitionInterface) {
            return $this->inner->calculateForQuantity(
                $quantityPriceRule,
                $subject,
                $quantity,
                $originalPrice,
                $context,
            );
        }

        $locatedRange = $this->locate($quantityPriceRule->getRanges(), $quantity, $context['unitDefinition']);

        if (null === $locatedRange) {
            throw new NoPriceFoundException(__CLASS__);
        }

        $price = $this->inner->calculateRangePrice($locatedRange, $subject, $originalPrice, $context);

        if ($price === 0) {
            throw new NoPriceFoundException(__CLASS__);
        }

        if ($subject instanceof ProductInterface && is_numeric($subject->getItemQuantityFactor()) && $subject->getItemQuantityFactor() > 1) {
            $price = (int) ($price / $subject->getItemQuantityFactor());
        }

        return $price;
    }

    public function calculateForRange(
        QuantityRangeInterface $range,
        QuantityRangePriceAwareInterface $subject,
        int $originalPrice,
        array $context,
    ): int {
        return $this->inner->calculateForRange($range, $subject, $originalPrice, $context);
    }

    protected function locate(
        Collection $ranges,
        float $quantity,
        ProductUnitDefinitionInterface $unitDefinition,
    ): ?QuantityRangeInterface {
        if ($ranges->isEmpty()) {
            return null;
        }

        $cheapestRangePrice = null;
        $unitFilteredRanges = array_filter(
            $ranges->toArray(),
            static function (CoreQuantityRangeInterface $range) use ($unitDefinition) {
                if (!$range->getUnitDefinition() instanceof ProductUnitDefinitionInterface) {
                    return false;
                }
                if ($range->getUnitDefinition()->getId() !== $unitDefinition->getId()) {
                    return false;
                }

                return true;
            },
        );

        // reset array index
        $unitFilteredRanges = array_values($unitFilteredRanges);

        /** @var CoreQuantityRangeInterface $range */
        foreach ($unitFilteredRanges as $range) {
            if ($range->getRangeStartingFrom() > $quantity) {
                break;
            }

            $cheapestRangePrice = $range;
        }

        return $cheapestRangePrice;
    }
}
