<?php
/**
 * Bestellnummer-Verwaltung für Skrift Konfigurator
 * Generiert fortlaufende Bestellnummern im Format: S-JAHR-MONAT-TAG-XXX
 */

if (!defined('ABSPATH')) { exit; }

final class Skrift_Konfigurator_Orders {

  const COUNTER_OPTION_KEY = 'skrift_konfigurator_order_counter';
  const ORDERS_OPTION_KEY = 'skrift_konfigurator_orders';

  public function __construct() {
    add_action('rest_api_init', [$this, 'register_rest_routes']);
  }

  /**
   * REST API Routen registrieren
   */
  public function register_rest_routes() {
    // Neue Bestellnummer generieren
    register_rest_route('skrift/v1', '/order/generate-number', [
      'methods' => 'POST',
      'callback' => [$this, 'rest_generate_order_number'],
      'permission_callback' => ['Skrift_Konfigurator_Admin_Settings', 'rest_api_key_permission'],
    ]);

    // Bestellung registrieren (nach erfolgreicher Zahlung)
    register_rest_route('skrift/v1', '/order/register', [
      'methods' => 'POST',
      'callback' => [$this, 'rest_register_order'],
      'permission_callback' => ['Skrift_Konfigurator_Admin_Settings', 'rest_api_key_permission'],
    ]);
  }

  /**
   * Generiert die nächste fortlaufende Bestellnummer
   * Format: S-YYYY-MM-DD-XXX (z.B. S-2026-01-12-001)
   * Verwendet Transient-Lock um Race Conditions zu vermeiden
   */
  public static function generate_order_number() {
    $lock_key = 'skrift_order_number_lock';
    $max_attempts = 10;
    $attempt = 0;

    // Versuche Lock zu bekommen (einfaches Locking mit Transients)
    while ($attempt < $max_attempts) {
      // Prüfe ob Lock existiert
      if (get_transient($lock_key) === false) {
        // Setze Lock (5 Sekunden Timeout)
        set_transient($lock_key, time(), 5);

        // Aktuellen Counter holen
        $counter_data = get_option(self::COUNTER_OPTION_KEY, [
          'date' => '',
          'counter' => 0
        ]);

        $today = date('Y-m-d');

        // Counter zurücksetzen wenn neuer Tag
        if ($counter_data['date'] !== $today) {
          $counter_data = [
            'date' => $today,
            'counter' => 0
          ];
        }

        // Counter erhöhen
        $counter_data['counter']++;

        // Speichern
        update_option(self::COUNTER_OPTION_KEY, $counter_data);

        // Lock freigeben
        delete_transient($lock_key);

        // Format: S-YYYY-MM-DD-XXX
        $year = date('Y');
        $month = date('m');
        $day = date('d');
        $number = str_pad($counter_data['counter'], 3, '0', STR_PAD_LEFT);

        return "S-{$year}-{$month}-{$day}-{$number}";
      }

      // Warte kurz und versuche erneut
      usleep(100000); // 100ms
      $attempt++;
    }

    // Fallback wenn Lock nicht bekommen werden konnte
    // Verwende Microtime für Eindeutigkeit
    $year = date('Y');
    $month = date('m');
    $day = date('d');
    $micro = substr(str_replace('.', '', microtime(true)), -6);

    return "S-{$year}-{$month}-{$day}-{$micro}";
  }

  /**
   * REST API Endpoint: Neue Bestellnummer generieren
   */
  public function rest_generate_order_number($request) {
    $order_number = self::generate_order_number();

    return [
      'success' => true,
      'orderNumber' => $order_number
    ];
  }

  /**
   * REST API Endpoint: Bestellung registrieren
   */
  public function rest_register_order($request) {
    $order_number = $request->get_param('orderNumber');
    $customer = $request->get_param('customer');
    $quote = $request->get_param('quote');
    $payment_method = $request->get_param('paymentMethod');
    $payment_id = $request->get_param('paymentId');

    if (empty($order_number)) {
      return new WP_Error('missing_order_number', 'Bestellnummer fehlt', ['status' => 400]);
    }

    // Bestellung speichern
    $orders = get_option(self::ORDERS_OPTION_KEY, []);

    $orders[$order_number] = [
      'orderNumber' => $order_number,
      'customer' => $customer,
      'quote' => $quote,
      'paymentMethod' => $payment_method,
      'paymentId' => $payment_id,
      'createdAt' => current_time('mysql'),
      'status' => 'pending'
    ];

    update_option(self::ORDERS_OPTION_KEY, $orders);

    return [
      'success' => true,
      'orderNumber' => $order_number,
      'message' => 'Bestellung erfolgreich registriert'
    ];
  }

  /**
   * Bestellung als bezahlt markieren
   */
  public static function mark_order_paid($order_number, $payment_id = null) {
    $orders = get_option(self::ORDERS_OPTION_KEY, []);

    if (isset($orders[$order_number])) {
      $orders[$order_number]['status'] = 'paid';
      $orders[$order_number]['paidAt'] = current_time('mysql');
      if ($payment_id) {
        $orders[$order_number]['paymentId'] = $payment_id;
      }
      update_option(self::ORDERS_OPTION_KEY, $orders);
      return true;
    }

    return false;
  }

  /**
   * Alle Bestellungen abrufen
   */
  public static function get_orders() {
    return get_option(self::ORDERS_OPTION_KEY, []);
  }

  /**
   * Einzelne Bestellung abrufen
   */
  public static function get_order($order_number) {
    $orders = self::get_orders();
    return $orders[$order_number] ?? null;
  }
}

new Skrift_Konfigurator_Orders();