<?php

namespace App\Support\Link;

use Illuminate\Http\Request;

final class LinkGeoResolver
{
    public static function countryCode(Request $request): ?string
    {
        foreach (['CF-IPCountry', 'X-Country-Code', 'CloudFront-Viewer-Country'] as $header) {
            $value = $request->header($header);
            if (! is_string($value) || strlen($value) !== 2) {
                continue;
            }

            $code = strtoupper($value);
            if (! in_array($code, ['XX', 'T1'], true)) {
                return $code;
            }
        }

        return null;
    }

    public static function countryLabel(?string $code): string
    {
        if ($code === null || $code === '') {
            return 'Unknown';
        }

        if (function_exists('locale_get_display_region')) {
            $name = locale_get_display_region('_'.$code, 'en');

            return is_string($name) && $name !== '' ? $name : $code;
        }

        return $code;
    }
}