class ReadOnlyStorageTest

class ReadOnlyStorageTest extends UnitTestCase {
  use StorageCopyTrait;
  
  /**
   * The memory storage containing the data.
   *
   * @var \Drupal\Core\Config\MemoryStorage
   */
  protected $memory;
  
  /**
   * The read-only storage under test.
   *
   * @var \Drupal\Core\Config\ReadOnlyStorage
   */
  protected $storage;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Set up a memory storage we can manipulate to set fixtures.
    $this->memory = new MemoryStorage();
    // Wrap the memory storage in the read-only storage to test it.
    $this->storage = new ReadOnlyStorage($this->memory);
  }
  
  /**
   * @covers ::exists
   * @covers ::read
   * @covers ::readMultiple
   * @covers ::listAll
   *
   * @dataProvider readMethodsProvider
   */
  public function testReadOperations($method, $arguments, $fixture) : void {
    $this->setRandomFixtureConfig($fixture);
    $expected = call_user_func_array([
      $this->memory,
      $method,
    ], $arguments);
    $actual = call_user_func_array([
      $this->storage,
      $method,
    ], $arguments);
    $this->assertEquals($expected, $actual);
  }
  
  /**
   * Provide the methods that work transparently.
   *
   * @return array
   *   The data.
   */
  public static function readMethodsProvider() {
    $fixture = [
      StorageInterface::DEFAULT_COLLECTION => [
        'config.a',
        'config.b',
        'other.a',
      ],
    ];
    $data = [];
    $data[] = [
      'exists',
      [
        'config.a',
      ],
      $fixture,
    ];
    $data[] = [
      'exists',
      [
        'not.existing',
      ],
      $fixture,
    ];
    $data[] = [
      'read',
      [
        'config.a',
      ],
      $fixture,
    ];
    $data[] = [
      'read',
      [
        'not.existing',
      ],
      $fixture,
    ];
    $data[] = [
      'readMultiple',
      [
        [
          'config.a',
          'config.b',
          'not',
        ],
      ],
      $fixture,
    ];
    $data[] = [
      'listAll',
      [
        '',
      ],
      $fixture,
    ];
    $data[] = [
      'listAll',
      [
        'config',
      ],
      $fixture,
    ];
    $data[] = [
      'listAll',
      [
        'none',
      ],
      $fixture,
    ];
    return $data;
  }
  
  /**
   * @covers ::write
   * @covers ::delete
   * @covers ::rename
   * @covers ::deleteAll
   *
   * @dataProvider writeMethodsProvider
   */
  public function testWriteOperations($method, $arguments, $fixture) : void {
    $this->setRandomFixtureConfig($fixture);
    // Create an independent memory storage as a backup.
    $backup = new MemoryStorage();
    static::replaceStorageContents($this->memory, $backup);
    try {
      call_user_func_array([
        $this->storage,
        $method,
      ], $arguments);
      $this->fail("exception not thrown");
    } catch (\BadMethodCallException $exception) {
      $this->assertEquals(ReadOnlyStorage::class . '::' . $method . ' is not allowed on a ReadOnlyStorage', $exception->getMessage());
    }
    // Assert that the memory storage has not been altered.
    $this->assertEquals($backup, $this->memory);
  }
  
  /**
   * Provide the methods that throw an exception.
   *
   * @return array
   *   The data
   */
  public static function writeMethodsProvider() {
    $fixture = [
      StorageInterface::DEFAULT_COLLECTION => [
        'config.a',
        'config.b',
      ],
    ];
    $data = [];
    $data[] = [
      'write',
      [
        'config.a',
        (array) Random::getGenerator()->object(),
      ],
      $fixture,
    ];
    $data[] = [
      'write',
      [
        Random::machineName(),
        (array) Random::getGenerator()->object(),
      ],
      $fixture,
    ];
    $data[] = [
      'delete',
      [
        'config.a',
      ],
      $fixture,
    ];
    $data[] = [
      'delete',
      [
        Random::machineName(),
      ],
      $fixture,
    ];
    $data[] = [
      'rename',
      [
        'config.a',
        'config.b',
      ],
      $fixture,
    ];
    $data[] = [
      'rename',
      [
        'config.a',
        Random::machineName(),
      ],
      $fixture,
    ];
    $data[] = [
      'rename',
      [
        Random::machineName(),
        Random::machineName(),
      ],
      $fixture,
    ];
    $data[] = [
      'deleteAll',
      [
        '',
      ],
      $fixture,
    ];
    $data[] = [
      'deleteAll',
      [
        'config',
      ],
      $fixture,
    ];
    $data[] = [
      'deleteAll',
      [
        'other',
      ],
      $fixture,
    ];
    return $data;
  }
  
  /**
   * @covers ::getAllCollectionNames
   * @covers ::getCollectionName
   * @covers ::createCollection
   */
  public function testCollections() : void {
    $fixture = [
      StorageInterface::DEFAULT_COLLECTION => [
        $this->randomMachineName(),
      ],
      'A' => [
        $this->randomMachineName(),
      ],
      'B' => [
        $this->randomMachineName(),
      ],
      'C' => [
        $this->randomMachineName(),
      ],
    ];
    $this->setRandomFixtureConfig($fixture);
    $this->assertEquals([
      'A',
      'B',
      'C',
    ], $this->storage
      ->getAllCollectionNames());
    foreach (array_keys($fixture) as $collection) {
      $storage = $this->storage
        ->createCollection($collection);
      // Assert that the collection storage is still a read-only storage.
      $this->assertInstanceOf(ReadOnlyStorage::class, $storage);
      $this->assertEquals($collection, $storage->getCollectionName());
    }
  }
  
  /**
   * @covers ::encode
   * @covers ::decode
   */
  public function testEncodeDecode() : void {
    $array = (array) $this->getRandomGenerator()
      ->object();
    $string = $this->getRandomGenerator()
      ->string();
    // Assert reversibility of encoding and decoding.
    $this->assertEquals($array, $this->storage
      ->decode($this->storage
      ->encode($array)));
    $this->assertEquals($string, $this->storage
      ->encode($this->storage
      ->decode($string)));
    // Assert same results as the decorated storage.
    $this->assertEquals($this->memory
      ->encode($array), $this->storage
      ->encode($array));
    $this->assertEquals($this->memory
      ->decode($string), $this->storage
      ->decode($string));
  }
  
  /**
   * Generate random config in the memory storage.
   *
   * @param array $config
   *   The config keys, keyed by the collection.
   */
  protected function setRandomFixtureConfig($config) : void {
    // Erase previous fixture.
    foreach (array_merge([
      StorageInterface::DEFAULT_COLLECTION,
    ], $this->memory
      ->getAllCollectionNames()) as $collection) {
      $this->memory
        ->createCollection($collection)
        ->deleteAll();
    }
    foreach ($config as $collection => $keys) {
      $storage = $this->memory
        ->createCollection($collection);
      foreach ($keys as $key) {
        // Create some random config.
        $storage->write($key, (array) $this->getRandomGenerator()
          ->object());
      }
    }
  }

}