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<?php

declare(strict_types=1);

namespace Drupal\KernelTests\Core\Config;

use Drupal\config_entity_static_cache_test\ConfigOverrider;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests the entity static cache when used by config entities.
 *
 * @group config
 */
class ConfigEntityStaticCacheTest extends KernelTestBase {

  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'config_test',
    'config_entity_static_cache_test',
  ];

  /**
   * The type ID of the entity under test.
   *
   * @var string
   */
  protected $entityTypeId;

  /**
   * The entity ID of the entity under test.
   *
   * @var string
   */
  protected $entityId;

  /**
   * {@inheritdoc}
   */
  protected function setUp(): void {
    parent::setUp();
    $this->entityTypeId = 'config_test';
    $this->entityId = 'test_1';
    $this->container->get('entity_type.manager')
      ->getStorage($this->entityTypeId)
      ->create(['id' => $this->entityId, 'label' => 'Original label'])
      ->save();
  }

  /**
   * Tests that the static cache is working.
   */
  public function testCacheHit(): void {
    $storage = $this->container->get('entity_type.manager')
      ->getStorage($this->entityTypeId);
    $entity_1 = $storage->load($this->entityId);
    $entity_2 = $storage->load($this->entityId);
    // config_entity_static_cache_test_config_test_load() sets _loadStamp to a
    // random string. If they match, it means $entity_2 was retrieved from the
    // static cache rather than going through a separate load sequence.
    $this->assertSame($entity_1->_loadStamp, $entity_2->_loadStamp);
  }

  /**
   * Tests that the static cache is reset on entity save and delete.
   */
  public function testReset(): void {
    $storage = $this->container->get('entity_type.manager')
      ->getStorage($this->entityTypeId);
    $entity = $storage->load($this->entityId);

    // Ensure loading after a save retrieves the updated entity rather than an
    // obsolete cached one.
    $entity->label = 'New label';
    $entity->save();
    $entity = $storage->load($this->entityId);
    $this->assertSame('New label', $entity->label);

    // Ensure loading after a delete retrieves NULL rather than an obsolete
    // cached one.
    $entity->delete();
    $this->assertNull($storage->load($this->entityId));
  }

  /**
   * Tests that the static cache is sensitive to config overrides.
   */
  public function testConfigOverride(): void {
    /** @var \Drupal\Core\Config\Entity\ConfigEntityStorage $storage */
    $storage = \Drupal::entityTypeManager()->getStorage($this->entityTypeId);
    // Prime the cache prior to adding a config override.
    $storage->load($this->entityId);

    // Add the config override, and ensure that what is loaded is correct
    // despite the prior cache priming.
    \Drupal::configFactory()->addOverride(new ConfigOverrider());
    $entity_override = $storage->load($this->entityId);
    $this->assertSame('Overridden label', $entity_override->label);

    // Load override free to ensure that loading the config entity again does
    // not return the overridden value.
    $entity_no_override = $storage->loadOverrideFree($this->entityId);
    $this->assertNotSame('Overridden label', $entity_no_override->label);
    $this->assertNotSame($entity_override->_loadStamp, $entity_no_override->_loadStamp);

    // Reload the entity and ensure the cache is used.
    $this->assertSame($entity_no_override->_loadStamp, $storage->loadOverrideFree($this->entityId)->_loadStamp);

    // Enable overrides and reload the entity and ensure the cache is used.
    $this->assertSame($entity_override->_loadStamp, $storage->load($this->entityId)->_loadStamp);
  }

}