<?php
declare(strict_types=1);

namespace Esun\ProductInquiry\Model;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\CatalogInventory\Api\StockRegistryInterface;
use Magento\InventorySalesApi\Api\Data\SalesChannelInterface;
use Magento\InventorySalesApi\Api\IsProductSalableInterface;
use Magento\InventorySalesApi\Api\StockResolverInterface;
use Magento\Store\Api\Data\WebsiteInterface;

class AvailabilityResolver
{
    public function __construct(
        private readonly StockRegistryInterface $stockRegistry,
        private readonly StockResolverInterface $stockResolver,
        private readonly IsProductSalableInterface $isProductSalable
    ) {
    }

    public function resolve(ProductInterface $product, WebsiteInterface $website): array
    {
        $stockItem = $this->stockRegistry->getStockItem((int)$product->getId(), (int)$website->getId());
        $stock = $this->stockResolver->execute(SalesChannelInterface::TYPE_WEBSITE, (string)$website->getCode());
        $legacyInStock = (bool)$stockItem->getIsInStock();
        $msiSalable = $this->isProductSalable->execute((string)$product->getSku(), (int)$stock->getStockId());

        if (!$legacyInStock && !$msiSalable) {
            $reason = 'both';
        } elseif (!$legacyInStock) {
            $reason = 'manual_out_of_stock';
        } elseif (!$msiSalable) {
            $reason = 'msi_not_salable';
        } else {
            $reason = 'salable';
        }

        return [
            'stock_status' => (int)$legacyInStock,
            'is_salable' => (int)$msiSalable,
            'stock_id' => (int)$stock->getStockId(),
            'reason' => $reason,
            'requires_inquiry' => !$legacyInStock || !$msiSalable,
        ];
    }
}