<?php
declare(strict_types=1);

namespace PaypalV2;

/**
 * Laedt die geschuetzte PayPal-v2-Konfiguration von ausserhalb des Webroots.
 */
final class Config
{
    /** Kandidaten-Pfade fuer die Config (erster lesbarer gewinnt). */
    private const PATHS = [
        '/var/www/vhosts/intelectra.de/import/paypal_v2/config.php',
    ];

    private static ?array $data = null;
    private static ?string $resolvedPath = null;

    public static function load(): array
    {
        if (self::$data !== null) {
            return self::$data;
        }

        foreach (self::PATHS as $path) {
            if (is_file($path) && is_readable($path)) {
                $cfg = include $path;
                if (!is_array($cfg)) {
                    throw new \RuntimeException('PayPal v2: Config liefert kein Array: ' . $path);
                }
                self::$data = $cfg;
                self::$resolvedPath = $path;
                return self::$data;
            }
        }

        throw new \RuntimeException('PayPal v2: Keine lesbare Config-Datei gefunden.');
    }

    public static function configPath(): string
    {
        self::load();
        return (string) self::$resolvedPath;
    }

    /** Verzeichnis der Config – dient auch als Ablage fuer den Token-Cache. */
    public static function dir(): string
    {
        return \dirname(self::configPath());
    }

    public static function mode(): string
    {
        $cfg = self::load();
        return (($cfg['mode'] ?? 'sandbox') === 'live') ? 'live' : 'sandbox';
    }

    /** @return array{client_id:string,secret:string,webhook_id:string} */
    public static function creds(): array
    {
        $cfg  = self::load();
        $mode = self::mode();
        $c    = $cfg[$mode] ?? [];

        $clientId = (string) ($c['client_id'] ?? '');
        $secret   = (string) ($c['secret'] ?? '');

        if ($clientId === '' || $secret === '' || \str_starts_with($clientId, 'HIER_')) {
            throw new \RuntimeException('PayPal v2: Zugangsdaten fuer Modus "' . $mode . '" fehlen oder sind Platzhalter.');
        }

        return [
            'client_id'  => $clientId,
            'secret'     => $secret,
            'webhook_id' => (string) ($c['webhook_id'] ?? ''),
        ];
    }

    public static function apiBase(): string
    {
        return self::mode() === 'live'
            ? 'https://api-m.paypal.com'
            : 'https://api-m.sandbox.paypal.com';
    }

    public static function webhookId(): string
    {
        $cfg  = self::load();
        $mode = self::mode();
        return (string) ($cfg[$mode]['webhook_id'] ?? '');
    }

    /** @return mixed */
    public static function get(string $key, $default = null)
    {
        $cfg = self::load();
        return $cfg[$key] ?? $default;
    }
}