class LinkTypeConstraintValidatorTest

class LinkTypeConstraintValidatorTest extends UnitTestCase {
  
  /**
   * Validate a good internal link.
   */
  public function testInternal() : void {
    $url = Url::fromRoute('example.existing_route');
    $urlGenerator = $this->createMock(UrlGeneratorInterface::class);
    $urlGenerator->expects($this->any())
      ->method('generateFromRoute')
      ->with('example.existing_route', [], [])
      ->willReturn('/example/existing');
    $url->setUrlGenerator($urlGenerator);
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_INTERNAL));
    $link->expects($this->once())
      ->method('getUrl')
      ->willReturn($url);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->never())
      ->method('buildViolation');
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate an external link in an internal-only field.
   */
  public function testBadInternal() : void {
    $url = Url::fromUri('https://www.drupal.org');
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_INTERNAL));
    $link->expects($this->once())
      ->method('getUrl')
      ->willReturn($url);
    $constraintViolationBuilder = $this->createMock(ConstraintViolationBuilderInterface::class);
    $constraintViolationBuilder->method('atPath')
      ->with('uri')
      ->willReturn($constraintViolationBuilder);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->once())
      ->method('buildViolation')
      ->willReturn($constraintViolationBuilder);
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate a good external link.
   */
  public function testExternal() : void {
    $url = Url::fromUri('https://www.drupal.org');
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_EXTERNAL));
    $link->expects($this->once())
      ->method('getUrl')
      ->willReturn($url);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->never())
      ->method('buildViolation');
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate an internal link in an external-only field.
   */
  public function testBadExternal() : void {
    $url = Url::fromRoute('example.existing_route');
    $urlGenerator = $this->createMock(UrlGeneratorInterface::class);
    $urlGenerator->expects($this->any())
      ->method('generateFromRoute')
      ->with('example.existing_route', [], [])
      ->willReturn('/example/existing');
    $url->setUrlGenerator($urlGenerator);
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_EXTERNAL));
    $link->expects($this->any())
      ->method('getUrl')
      ->willReturn($url);
    $constraintViolationBuilder = $this->createMock(ConstraintViolationBuilderInterface::class);
    $constraintViolationBuilder->method('atPath')
      ->with('uri')
      ->willReturn($constraintViolationBuilder);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->once())
      ->method('buildViolation');
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate a URL that throws an exception.
   */
  public function testBadUrl() : void {
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_INTERNAL));
    $link->expects($this->once())
      ->method('getUrl')
      ->willThrowException(new \InvalidArgumentException());
    $constraintViolationBuilder = $this->createMock(ConstraintViolationBuilderInterface::class);
    $constraintViolationBuilder->method('atPath')
      ->with('uri')
      ->willReturn($constraintViolationBuilder);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->once())
      ->method('buildViolation')
      ->willReturn($constraintViolationBuilder);
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate a URL in a field that accepts both internal and external URLs.
   */
  public function testGeneric() : void {
    $url = Url::fromRoute('example.existing_route');
    $link = $this->createMock(LinkItemInterface::class);
    $link->expects($this->once())
      ->method('getFieldDefinition')
      ->willReturn($this->getMockFieldDefinition(LinkItemInterface::LINK_GENERIC));
    $link->expects($this->once())
      ->method('getUrl')
      ->willReturn($url);
    $context = $this->createMock(ExecutionContextInterface::class);
    $context->expects($this->never())
      ->method('buildViolation');
    $this->doValidate($link, $context);
  }
  
  /**
   * Validate the link.
   */
  protected function doValidate(LinkItemInterface&MockObject $link, ExecutionContextInterface&MockObject $context) : void {
    $validator = new LinkTypeConstraintValidator();
    $validator->initialize($context);
    $validator->validate($link, new LinkTypeConstraint());
  }
  
  /**
   * Builds a mock Link field definition.
   *
   * @param int $type
   *   The type of Link field as defined in LinkItemInterface.
   *
   * @return \Drupal\Core\Field\FieldDefinitionInterface
   *   The mock field definition.
   */
  protected function getMockFieldDefinition(int $type) : FieldDefinitionInterface {
    $definition = $this->createMock(FieldDefinitionInterface::class);
    $definition->expects($this->once())
      ->method('getSetting')
      ->with('link_type')
      ->willReturn($type);
    return $definition;
  }

}