class CheckpointStorageTest

class CheckpointStorageTest extends UnitTestCase {
    use StorageCopyTrait;
    
    /**
     * The memory storage containing the data.
     *
     * @var \Drupal\Core\Config\MemoryStorage
     */
    protected MemoryStorage $memory;
    
    /**
     * The checkpoint storage under test.
     *
     * @var \Drupal\Core\Config\Checkpoint\CheckpointStorage
     */
    protected CheckpointStorage $storage;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Set up a memory storage we can manipulate to set fixtures.
        $this->memory = new MemoryStorage();
        $keyValueMemoryFactory = new KeyValueMemoryFactory();
        $state = new State($keyValueMemoryFactory, new NullBackend('test'), new NullLockBackend());
        $time = new Time();
        $checkpoints = new LinearHistory($state, $time);
        $this->storage = new CheckpointStorage($this->memory, $checkpoints, $keyValueMemoryFactory);
    }
    
    /**
     * @covers ::checkpoint
     * @covers \Drupal\Core\Config\Checkpoint\Checkpoint
     */
    public function testCheckpointCreation() : void {
        $checkpoint = $this->storage
            ->checkpoint('Test');
        $this->assertInstanceOf(Checkpoint::class, $checkpoint);
        $this->assertSame('Test', $checkpoint->label);
        $checkpoint2 = $this->storage
            ->checkpoint('This will not make a checkpoint because nothing has changed');
        $this->assertSame($checkpoint2, $checkpoint);
        $config = $this->prophesize(Config::class);
        $config->getName()
            ->willReturn('test.config');
        $config->getOriginal('', FALSE)
            ->willReturn([]);
        $config->getRawData()
            ->willReturn([
            'foo' => 'bar',
        ]);
        $config->getStorage()
            ->willReturn($this->storage);
        $event = new ConfigCrudEvent($config->reveal());
        $this->storage
            ->onConfigSaveAndDelete($event);
        $checkpoint3 = $this->storage
            ->checkpoint('Created test.config');
        $this->assertNotSame($checkpoint3, $checkpoint);
        $this->assertSame('Created test.config', $checkpoint3->label);
        $checkpoint4 = $this->storage
            ->checkpoint('This will not create a checkpoint either');
        $this->assertSame($checkpoint4, $checkpoint3);
        // Simulate a save with no change.
        $config = $this->prophesize(Config::class);
        $config->getName()
            ->willReturn('test.config');
        $config->getOriginal('', FALSE)
            ->willReturn([
            'foo' => 'bar',
        ]);
        $config->getRawData()
            ->willReturn([
            'foo' => 'bar',
        ]);
        $config->getStorage()
            ->willReturn($this->storage);
        $event = new ConfigCrudEvent($config->reveal());
        $this->storage
            ->onConfigSaveAndDelete($event);
        $checkpoint5 = $this->storage
            ->checkpoint('Save with no change');
        $this->assertSame($checkpoint5, $checkpoint3);
        // Create collection and ensure that checkpoints are kept in sync.
        $collection = $this->storage
            ->createCollection('test');
        $config = $this->prophesize(Config::class);
        $config->getName()
            ->willReturn('test.config');
        $config->getOriginal('', FALSE)
            ->willReturn([
            'foo' => 'bar',
        ]);
        $config->getRawData()
            ->willReturn([
            'foo' => 'collection_bar',
        ]);
        $config->getStorage()
            ->willReturn($collection);
        $event = new ConfigCrudEvent($config->reveal());
        $collection->onConfigSaveAndDelete($event);
        $checkpoint6 = $this->storage
            ->checkpoint('Save in collection');
        $this->assertNotSame($checkpoint6, $checkpoint3);
        $this->assertSame($collection->checkpoint('Calling checkpoint on collection'), $checkpoint6);
    }
    
    /**
     * @covers ::exists
     * @covers ::read
     * @covers ::readMultiple
     * @covers ::listAll
     *
     * @dataProvider readMethodsProvider
     */
    public function testReadOperations(string $method, array $arguments, array $fixture) : void {
        // Create a checkpoint so the checkpoint storage can be read from.
        $this->storage
            ->checkpoint('');
        $this->setRandomFixtureConfig($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() : array {
        $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(string $method, array $arguments, array $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(CheckpointStorage::class . '::' . $method . ' is not allowed on a CheckpointStorage', $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() : array {
        $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 {
        $ref_readFromCheckpoint = new \ReflectionProperty($this->storage, 'readFromCheckpoint');
        // Create some checkpoints so the checkpoint storage can be read from.
        $checkpoint1 = $this->storage
            ->checkpoint('1');
        $config = $this->prophesize(Config::class);
        $config->getName()
            ->willReturn('test.config');
        $config->getOriginal('', FALSE)
            ->willReturn([]);
        $config->getRawData()
            ->willReturn([
            'foo' => 'bar',
        ]);
        $config->getStorage()
            ->willReturn($this->storage);
        $event = new ConfigCrudEvent($config->reveal());
        $this->storage
            ->onConfigSaveAndDelete($event);
        $checkpoint2 = $this->storage
            ->checkpoint('2');
        $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 checkpoint storage.
            $this->assertInstanceOf(CheckpointStorage::class, $storage);
            $this->assertEquals($collection, $storage->getCollectionName());
            // Ensure that the
            // \Drupal\Core\Config\Checkpoint\CheckpointStorage::$readFromCheckpoint
            // property is kept in sync.
            $this->storage
                ->setCheckpointToReadFrom($checkpoint2);
            $this->assertSame($checkpoint2->id, $ref_readFromCheckpoint->getValue($storage->createCollection($collection))?->id);
            if (isset($previous_collection)) {
                $previous_collection->setCheckpointToReadFrom($checkpoint1);
                $this->assertSame($checkpoint1->id, $ref_readFromCheckpoint->getValue($storage->createCollection($collection))?->id);
                $this->assertSame($checkpoint1->id, $ref_readFromCheckpoint->getValue($this->storage
                    ->createCollection($collection))?->id);
            }
            // Save the storage in a variable so we can test use
            // setCheckpointToReadFrom() on it.
            $previous_collection = $storage;
        }
    }
    
    /**
     * @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(array $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());
            }
        }
    }

}