<?php

declare(strict_types=1);

if (!defined('ABSPATH')) {
  exit;
}

/**
 * GA4 Tracking Implementation for QuickBundles
 */
class QBND_Tracking
{
  private static ?QBND_Tracking $instance = null;
  private string $measurement_id = 'G-4N0HV3PBWW';
  private string $api_secret = 'vbFpwjgZREe8quMAvd27rA';

  public static function get_instance(): QBND_Tracking
  {
    if (null === self::$instance) {
      self::$instance = new self();
    }
    return self::$instance;
  }

  private function __construct()
  {
    add_action('wp_ajax_quickbundles_handle_consent', [$this, 'handle_consent_ajax']);
    add_action('wp_ajax_nopriv_quickbundles_handle_consent', [$this, 'handle_consent_ajax']);
  }

  public function track_installation(): void
  {
    if (!$this->has_tracking_consent() || $this->is_installation_tracked()) {
      return;
    }

    $client_id = wp_generate_uuid4();
    $timestamp_micros = (int)(microtime(true) * 1000000);

    $data = [
      'client_id' => $client_id,
      'events' => [
        [
          'name' => 'plugin_installation',
          'params' => [
            'plugin_name' => 'QuickBundles for WooCommerce',
            'site_url' => get_site_url()
          ]
        ]
      ]
    ];

    $url = sprintf(
      'https://www.google-analytics.com/mp/collect?measurement_id=%s&api_secret=%s',
      $this->measurement_id,
      $this->api_secret
    );

    $response = wp_remote_post($url, [
      'body' => wp_json_encode($data),
      'headers' => ['Content-Type' => 'application/json'],
      'timeout' => 5,
      'sslverify' => true,
    ]);

    if (!is_wp_error($response) && wp_remote_retrieve_response_code($response) === 200) {
      update_option('quickbundles_installation_tracked', true);
    }
  }

  public function handle_consent_ajax(): void
  {
    check_ajax_referer('quickbundles_nonce', 'nonce');

    $consent = isset($_POST['consent']) ? sanitize_text_field($_POST['consent']) : '';
    $valid_values = ['allowed', 'denied'];

    if (!in_array($consent, $valid_values)) {
      wp_send_json_error(['message' => __('Invalid consent value', 'quickbundles')]);
    }

    update_option('quickbundles_tracking_consent', $consent === 'allowed');
    update_option('quickbundles_tracking_consent_shown', $consent);

    if ($consent === 'allowed') {
      $this->track_installation();
      wp_send_json_success([
        'message' => __('Thank you for helping us improve QuickBundles!', 'quickbundles')
      ]);
    } else {
      wp_send_json_success([
        'message' => __('Your preference has been saved.', 'quickbundles')
      ]);
    }
  }

  private function has_tracking_consent(): bool
  {
    return get_option('quickbundles_tracking_consent', false);
  }

  private function is_installation_tracked(): bool
  {
    return get_option('quickbundles_installation_tracked', false);
  }
}