<?php
  
  /**
   * This file is part of the Carbon package.
   *
   * (c) Brian Nesbitt <brian@nesbot.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Carbon\Laravel;
  
  use Carbon\Carbon;
  use Carbon\CarbonImmutable;
  use Carbon\CarbonInterval;
  use Carbon\CarbonPeriod;
  use Illuminate\Contracts\Events\Dispatcher as DispatcherContract;
  use Illuminate\Events\Dispatcher;
  use Illuminate\Events\EventDispatcher;
  use Illuminate\Support\Carbon as IlluminateCarbon;
  use Illuminate\Support\Facades\Date;
  use Throwable;
  
  class ServiceProvider extends \Illuminate\Support\ServiceProvider
  {
      /** @var callable|null */
      protected $appGetter = null;
  
      /** @var callable|null */
      protected $localeGetter = null;
  
      public function setAppGetter(?callable $appGetter): void
      {
          $this->appGetter = $appGetter;
      }
  
      public function setLocaleGetter(?callable $localeGetter): void
      {
          $this->localeGetter = $localeGetter;
      }
  
      public function boot()
      {
          $this->updateLocale();
  
          if (!$this->app->bound('events')) {
              return;
          }
  
          $service = $this;
          $events = $this->app['events'];
  
          if ($this->isEventDispatcher($events)) {
              $events->listen(class_exists('Illuminate\Foundation\Events\LocaleUpdated') ? 'Illuminate\Foundation\Events\LocaleUpdated' : 'locale.changed', function () use ($service) {
                  $service->updateLocale();
              });
          }
      }
  
      public function updateLocale()
      {
          $locale = $this->getLocale();
  
          if ($locale === null) {
              return;
          }
  
          Carbon::setLocale($locale);
          CarbonImmutable::setLocale($locale);
          CarbonPeriod::setLocale($locale);
          CarbonInterval::setLocale($locale);
  
          if (class_exists(IlluminateCarbon::class)) {
              IlluminateCarbon::setLocale($locale);
          }
  
          if (class_exists(Date::class)) {
              try {
                  $root = Date::getFacadeRoot();
                  $root->setLocale($locale);
              } catch (Throwable $e) {
                  // Non Carbon class in use in Date facade
              }
          }
      }
  
      public function register()
      {
          // Needed for Laravel < 5.3 compatibility
      }
  
      protected function getLocale()
      {
          if ($this->localeGetter) {
              return ($this->localeGetter)();
          }
  
          $app = $this->getApp();
          $app = $app && method_exists($app, 'getLocale')
              ? $app
              : $this->getGlobalApp('translator');
  
          return $app ? $app->getLocale() : null;
      }
  
      protected function getApp()
      {
          if ($this->appGetter) {
              return ($this->appGetter)();
          }
  
          return $this->app ?? $this->getGlobalApp();
      }
  
      protected function getGlobalApp(...$args)
      {
          return \function_exists('app') ? \app(...$args) : null;
      }
  
      protected function isEventDispatcher($instance)
      {
          return $instance instanceof EventDispatcher
              || $instance instanceof Dispatcher
              || $instance instanceof DispatcherContract;
      }
  }