<?php
declare(strict_types=1);

namespace Esun\Reward\Model\Total\Quote;

use Esun\Reward\Model\Config;
use Magento\Quote\Api\Data\ShippingAssignmentInterface;
use Magento\Quote\Model\Quote;
use Magento\Quote\Model\Quote\Address\Total;
use Magento\Quote\Model\Quote\Address\Total\AbstractTotal;

class RewardDiscount extends AbstractTotal
{
    protected $_code = 'reward_discount';
    public function __construct(private readonly Config $config) {}
    public function collect(Quote $quote, ShippingAssignmentInterface $shippingAssignment, Total $total): self
    {
        parent::collect($quote, $shippingAssignment, $total);

        // A physical quote is collected once for shipping and again for its
        // empty billing assignment. Do not let the empty pass erase the
        // reward amount calculated for the shipping address.
        if (!$shippingAssignment->getItems()) {
            return $this;
        }

        $points = (int)$quote->getData('reward_points_used');
        if ($points <= 0 || !$quote->getCustomerId() || !$this->config->isEnabled((int)$quote->getStoreId())) {
            $quote->setData('reward_discount_amount', 0)->setData('base_reward_discount_amount', 0); return $this;
        }
        $baseRequested = $points / $this->config->redemptionRate((int)$quote->getStoreId());
        $baseMaximum = max(0.0, array_sum($total->getAllBaseTotalAmounts()));
        $baseDiscount = min($baseRequested, $baseMaximum);
        $discount = (float)$quote->getStore()->getBaseCurrency()->convert($baseDiscount, $quote->getStore()->getCurrentCurrency());
        $total->setBaseTotalAmount($this->getCode(), -$baseDiscount); $total->setTotalAmount($this->getCode(), -$discount);
        $quote->setData('base_reward_discount_amount', $baseDiscount)->setData('reward_discount_amount', $discount);
        return $this;
    }
    public function fetch(Quote $quote, Total $total): array
    {
        $amount = (float)$quote->getData('reward_discount_amount');
        $points = (int)$quote->getData('reward_points_used');
        return $amount > 0 ? [
            'code' => $this->getCode(),
            'title' => __('Points Discount (%1 points)', $points),
            'value' => -$amount
        ] : [];
    }
    public function getLabel(): string { return (string)__('Points Discount'); }
}