<?php
declare(strict_types=1);

namespace Esun\CustomerVat\Model;

use Magento\Directory\Model\ResourceModel\Country\CollectionFactory;

class EuCountries
{
    public const CODES = [
        'AT', 'BE', 'BG', 'HR', 'CY', 'CZ', 'DK', 'EE', 'FI', 'FR', 'DE', 'GR', 'HU', 'IE',
        'IT', 'LV', 'LT', 'LU', 'MT', 'NL', 'PL', 'PT', 'RO', 'SK', 'SI', 'ES', 'SE',
    ];

    public const RATES = [
        'NL' => 21.0,
        'AT' => 20.0,
        'ES' => 21.0,
        'CZ' => 21.0,
        'PL' => 23.0,
        'FR' => 20.0,
        'IT' => 22.0,
        'DE' => 19.0,
    ];

    public function __construct(private readonly CollectionFactory $countryCollectionFactory)
    {
    }

    public function isEu(string $countryId): bool
    {
        return in_array(strtoupper($countryId), self::CODES, true);
    }

    public function getRate(string $countryId): float
    {
        return self::RATES[strtoupper($countryId)] ?? 19.0;
    }

    public function getAppliedRate(string $countryId): float
    {
        return self::toAppliedRate($this->getRate($countryId));
    }

    public static function toAppliedRate(float $nominalRate): float
    {
        return $nominalRate > 0 ? ($nominalRate / (100 + $nominalRate)) * 100 : 0.0;
    }

    public function getOptions(): array
    {
        $options = [];
        $collection = $this->countryCollectionFactory->create()
            ->addCountryIdFilter(self::CODES);
        foreach ($collection as $country) {
            $options[] = ['value' => $country->getCountryId(), 'label' => $country->getName()];
        }
        usort($options, static fn (array $a, array $b): int => strcasecmp((string)$a['label'], (string)$b['label']));
        return $options;
    }
}