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<?php

namespace Drupal\KernelTests\Core\Entity;

use Drupal\Core\Entity\EntityViewBuilder;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Cache\Cache;
use Drupal\Tests\field\Traits\EntityReferenceTestTrait;
use Drupal\user\Entity\Role;
use Drupal\user\RoleInterface;

/**
 * Tests the entity view builder.
 *
 * @group Entity
 */
class EntityViewBuilderTest extends EntityKernelTestBase {

  use EntityReferenceTestTrait;

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->installConfig(['user', 'entity_test']);

    // Give anonymous users permission to view test entities.
    Role::load(RoleInterface::ANONYMOUS_ID)
      ->grantPermission('view test entity')
      ->save();
  }

  /**
   * Tests entity render cache handling.
   */
  public function testEntityViewBuilderCache() {
    /** @var \Drupal\Core\Render\RendererInterface $renderer */
    $renderer = $this->container->get('renderer');
    $cache_contexts_manager = \Drupal::service("cache_contexts_manager");
    $cache = \Drupal::cache();

    // Force a request via GET so we can get drupal_render() cache working.
    $request = \Drupal::request();
    $request_method = $request->server->get('REQUEST_METHOD');
    $request->setMethod('GET');

    $entity_test = $this->createTestEntity('entity_test');

    // Test that new entities (before they are saved for the first time) do not
    // generate a cache entry.
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'full');
    $this->assertTrue(isset($build['#cache']) && array_keys($build['#cache']) == ['tags', 'contexts', 'max-age'], 'The render array element of new (unsaved) entities is not cached, but does have cache tags set.');

    // Get a fully built entity view render array.
    $entity_test->save();
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'full');
    $cid_parts = array_merge($build['#cache']['keys'], $cache_contexts_manager->convertTokensToKeys(['languages:' . LanguageInterface::TYPE_INTERFACE, 'theme', 'user.permissions'])->getKeys());
    $cid = implode(':', $cid_parts);
    $bin = $build['#cache']['bin'];

    // Mock the build array to not require the theme registry.
    unset($build['#theme']);
    $build['#markup'] = 'entity_render_test';

    // Test that a cache entry is created.
    $renderer->renderRoot($build);
    $this->assertTrue($this->container->get('cache.' . $bin)->get($cid), 'The entity render element has been cached.');

    // Re-save the entity and check that the cache entry has been deleted.
    $cache->set('kittens', 'Kitten data', Cache::PERMANENT, $build['#cache']['tags']);
    $entity_test->save();
    $this->assertFalse($this->container->get('cache.' . $bin)->get($cid), 'The entity render cache has been cleared when the entity was saved.');
    $this->assertFalse($cache->get('kittens'), 'The entity saving has invalidated cache tags.');

    // Rebuild the render array (creating a new cache entry in the process) and
    // delete the entity to check the cache entry is deleted.
    unset($build['#printed']);
    $renderer->renderRoot($build);
    $this->assertTrue($this->container->get('cache.' . $bin)->get($cid), 'The entity render element has been cached.');
    $entity_test->delete();
    $this->assertFalse($this->container->get('cache.' . $bin)->get($cid), 'The entity render cache has been cleared when the entity was deleted.');

    // Restore the previous request method.
    $request->setMethod($request_method);
  }

  /**
   * Tests entity render cache with references.
   */
  public function testEntityViewBuilderCacheWithReferences() {
    /** @var \Drupal\Core\Render\RendererInterface $renderer */
    $renderer = $this->container->get('renderer');
    $cache_contexts_manager = \Drupal::service("cache_contexts_manager");

    // Force a request via GET so we can get drupal_render() cache working.
    $request = \Drupal::request();
    $request_method = $request->server->get('REQUEST_METHOD');
    $request->setMethod('GET');

    // Create an entity reference field and an entity that will be referenced.
    $this->createEntityReferenceField('entity_test', 'entity_test', 'reference_field', 'Reference', 'entity_test');
    entity_get_display('entity_test', 'entity_test', 'full')->setComponent('reference_field', [
      'type' => 'entity_reference_entity_view',
      'settings' => ['link' => FALSE],
    ])->save();
    $entity_test_reference = $this->createTestEntity('entity_test');
    $entity_test_reference->save();

    // Get a fully built entity view render array for the referenced entity.
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test_reference, 'full');
    $cid_parts = array_merge($build['#cache']['keys'], $cache_contexts_manager->convertTokensToKeys(['languages:' . LanguageInterface::TYPE_INTERFACE, 'theme', 'user.permissions'])->getKeys());
    $cid_reference = implode(':', $cid_parts);
    $bin_reference = $build['#cache']['bin'];

    // Mock the build array to not require the theme registry.
    unset($build['#theme']);
    $build['#markup'] = 'entity_render_test';
    $renderer->renderRoot($build);

    // Test that a cache entry was created for the referenced entity.
    $this->assertTrue($this->container->get('cache.' . $bin_reference)->get($cid_reference), 'The entity render element for the referenced entity has been cached.');

    // Create another entity that references the first one.
    $entity_test = $this->createTestEntity('entity_test');
    $entity_test->reference_field->entity = $entity_test_reference;
    $entity_test->save();

    // Get a fully built entity view render array.
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'full');
    $cid_parts = array_merge($build['#cache']['keys'], $cache_contexts_manager->convertTokensToKeys(['languages:' . LanguageInterface::TYPE_INTERFACE, 'theme', 'user.permissions'])->getKeys());
    $cid = implode(':', $cid_parts);
    $bin = $build['#cache']['bin'];

    // Mock the build array to not require the theme registry.
    unset($build['#theme']);
    $build['#markup'] = 'entity_render_test';
    $renderer->renderRoot($build);

    // Test that a cache entry is created.
    $this->assertTrue($this->container->get('cache.' . $bin)->get($cid), 'The entity render element has been cached.');

    // Save the entity and verify that both cache entries have been deleted.
    $entity_test_reference->save();
    $this->assertFalse($this->container->get('cache.' . $bin)->get($cid), 'The entity render cache has been cleared when the entity was deleted.');
    $this->assertFalse($this->container->get('cache.' . $bin_reference)->get($cid_reference), 'The entity render cache for the referenced entity has been cleared when the entity was deleted.');

    // Restore the previous request method.
    $request->setMethod($request_method);
  }

  /**
   * Tests entity render cache toggling.
   */
  public function testEntityViewBuilderCacheToggling() {
    $entity_test = $this->createTestEntity('entity_test');
    $entity_test->save();

    // Test a view mode in default conditions: render caching is enabled for
    // the entity type and the view mode.
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'full');
    $this->assertTrue(isset($build['#cache']) && array_keys($build['#cache']) == ['tags', 'contexts', 'max-age', 'keys', 'bin'], 'A view mode with render cache enabled has the correct output (cache tags, keys, contexts, max-age and bin).');

    // Test that a view mode can opt out of render caching.
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'test');
    $this->assertTrue(isset($build['#cache']) && array_keys($build['#cache']) == ['tags', 'contexts', 'max-age'], 'A view mode with render cache disabled has the correct output (only cache tags, contexts and max-age).');

    // Test that an entity type can opt out of render caching completely.
    $this->installEntitySchema('entity_test_label');
    $entity_test_no_cache = $this->createTestEntity('entity_test_label');
    $entity_test_no_cache->save();
    $build = $this->container->get('entity.manager')->getViewBuilder('entity_test_label')->view($entity_test_no_cache, 'full');
    $this->assertTrue(isset($build['#cache']) && array_keys($build['#cache']) == ['tags', 'contexts', 'max-age'], 'An entity type can opt out of render caching regardless of view mode configuration, but always has cache tags, contexts and max-age set.');
  }

  /**
   * Tests weighting of display components.
   */
  public function testEntityViewBuilderWeight() {
    /** @var \Drupal\Core\Render\RendererInterface $renderer */
    $renderer = $this->container->get('renderer');

    // Set a weight for the label component.
    entity_get_display('entity_test', 'entity_test', 'full')
      ->setComponent('label', ['weight' => 20])
      ->save();

    // Create and build a test entity.
    $entity_test = $this->createTestEntity('entity_test');
    $view = $this->container->get('entity.manager')->getViewBuilder('entity_test')->view($entity_test, 'full');
    $renderer->renderRoot($view);

    // Check that the weight is respected.
    $this->assertEqual($view['label']['#weight'], 20, 'The weight of a display component is respected.');
  }

  /**
   * Creates an entity for testing.
   *
   * @param string $entity_type
   *   The entity type.
   *
   * @return \Drupal\Core\Entity\EntityInterface
   *   The created entity.
   */
  protected function createTestEntity($entity_type) {
    $data = [
      'bundle' => $entity_type,
      'name' => $this->randomMachineName(),
    ];
    return $this->container->get('entity.manager')->getStorage($entity_type)->create($data);
  }

  /**
   * Tests that viewing an entity without template does not specify #theme.
   */
  public function testNoTemplate() {
    // Ensure that an entity type without explicit view builder uses the
    // default.
    $entity_type_manager = \Drupal::entityTypeManager();
    $entity_type = $entity_type_manager->getDefinition('entity_test_base_field_display');
    $this->assertTrue($entity_type->hasViewBuilderClass());
    $this->assertEquals(EntityViewBuilder::class, $entity_type->getViewBuilderClass());

    // Ensure that an entity without matching template does not have a #theme
    // key.
    $entity = $this->createTestEntity('entity_test');
    $build = $entity_type_manager->getViewBuilder('entity_test')->view($entity);
    $this->assertEquals($entity, $build['#entity_test']);
    $this->assertFalse(array_key_exists('#theme', $build));
  }

}