class RecipeConfigStorageWrapperTest

class RecipeConfigStorageWrapperTest extends UnitTestCase {
    
    /**
     * Validate that an empty set of storage backends returns null storage.
     */
    public function testNullStorage() : void {
        $this->assertInstanceOf(NullStorage::class, RecipeConfigStorageWrapper::createStorageFromArray([]));
    }
    
    /**
     * Validate that a single storage returns exactly the same instance.
     */
    public function testSingleStorage() : void {
        $storages = [
            new NullStorage(),
        ];
        $this->assertSame($storages[0], RecipeConfigStorageWrapper::createStorageFromArray($storages));
    }
    
    /**
     * Validate that multiple storages return underlying values correctly.
     */
    public function testMultipleStorages() : void {
        $a = new MemoryStorage();
        $a->write('a_key', [
            'a_data_first',
        ]);
        $b = new MemoryStorage();
        // Add a conflicting key so that we can test the first value is returned.
        $b->write('a_key', [
            'a_data_second',
        ]);
        $b->write('b_key', [
            'b_data',
        ]);
        // We test with a third storage as well since only two storages can be done
        // via the constructor alone.
        $c = new MemoryStorage();
        $c->write('c_key', [
            'c_data',
        ]);
        $storages = [
            $a,
            $b,
            $c,
        ];
        $wrapped = RecipeConfigStorageWrapper::createStorageFromArray($storages);
        $this->assertSame($a->read('a_key'), $wrapped->read('a_key'));
        $this->assertNotEquals($b->read('a_key'), $wrapped->read('a_key'));
        $this->assertSame($b->read('b_key'), $wrapped->read('b_key'));
        $this->assertSame($c->read('c_key'), $wrapped->read('c_key'));
    }
    
    /**
     * Validate that the first storage checks existence first.
     */
    public function testLeftSideExists() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('exists')
            ->with('a_key')
            ->willReturn(TRUE);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->never())
            ->method('exists');
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertTrue($storage->exists('a_key'));
    }
    
    /**
     * Validate that we fall back to the second storage.
     */
    public function testRightSideExists() : void {
        [
            $a,
            $b,
        ] = $this->generateStorages(TRUE);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $storage->exists('a_key');
    }
    
    /**
     * Validate FALSE when neither storage contains a key.
     */
    public function testNotExists() : void {
        [
            $a,
            $b,
        ] = $this->generateStorages(FALSE);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertFalse($storage->exists('a_key'));
    }
    
    /**
     * Validate that we read from storage A first.
     */
    public function testReadFromA() : void {
        $a = $this->createMock(StorageInterface::class);
        $value = [
            'a_value',
        ];
        $a->expects($this->once())
            ->method('read')
            ->with('a_key')
            ->willReturn($value);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->never())
            ->method('read');
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertSame($value, $storage->read('a_key'));
    }
    
    /**
     * Validate that we read from storage B second.
     */
    public function testReadFromB() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('read')
            ->with('a_key')
            ->willReturn(FALSE);
        $b = $this->createMock(StorageInterface::class);
        $value = [
            'a_value',
        ];
        $b->expects($this->once())
            ->method('read')
            ->with('a_key')
            ->willReturn($value);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertSame($value, $storage->read('a_key'));
    }
    
    /**
     * Validate when neither storage can read a value.
     */
    public function testReadFails() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('read')
            ->with('a_key')
            ->willReturn(FALSE);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->once())
            ->method('read')
            ->with('a_key')
            ->willReturn(FALSE);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertFalse($storage->read('a_key'));
    }
    
    /**
     * Test reading multiple values.
     */
    public function testReadMultiple() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('readMultiple')
            ->with([
            'a_key',
            'b_key',
        ])
            ->willReturn([
            'a_key' => [
                'a_value',
            ],
        ]);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->once())
            ->method('readMultiple')
            ->with([
            'a_key',
            'b_key',
        ])
            ->willReturn([
            'b_key' => [
                'b_value',
            ],
        ]);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertEquals([
            'a_key' => [
                'a_value',
            ],
            'b_key' => [
                'b_value',
            ],
        ], $storage->readMultiple([
            'a_key',
            'b_key',
        ]));
    }
    
    /**
     * Test that storage A has precedence over storage B.
     */
    public function testReadMultipleStorageA() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('readMultiple')
            ->with([
            'a_key',
            'b_key',
        ])
            ->willReturn([
            'a_key' => [
                'a_value',
            ],
        ]);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->once())
            ->method('readMultiple')
            ->with([
            'a_key',
            'b_key',
        ])
            ->willReturn([
            'a_key' => [
                'a_conflicting_value',
            ],
            'b_key' => [
                'b_value',
            ],
        ]);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertEquals([
            'a_key' => [
                'a_value',
            ],
            'b_key' => [
                'b_value',
            ],
        ], $storage->readMultiple([
            'a_key',
            'b_key',
        ]));
    }
    
    /**
     * Test methods that are unsupported.
     *
     * @param string $method
     *   The method to call.
     * @param array $args
     *   The arguments to pass to the method.
     *
     * @testWith ["write", "name", []]
     *           ["delete", "name"]
     *           ["rename", "old_name", "new_name"]
     *           ["deleteAll"]
     */
    public function testUnsupportedMethods(string $method, ...$args) : void {
        $this->expectException(\BadMethodCallException::class);
        $storage = new RecipeConfigStorageWrapper(new NullStorage(), new NullStorage());
        $storage->{$method}(...$args);
    }
    
    /**
     * Test that we only use storage A's encode method.
     */
    public function testEncode() : void {
        $a = $this->createMock(StorageInterface::class);
        $b = $this->createMock(StorageInterface::class);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->expectException(\BadMethodCallException::class);
        $storage->encode([
            'value',
        ]);
    }
    
    /**
     * Test that we only use storage A's decode method.
     */
    public function testDecode() : void {
        $a = $this->createMock(StorageInterface::class);
        $b = $this->createMock(StorageInterface::class);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->expectException(\BadMethodCallException::class);
        $storage->decode('value');
    }
    
    /**
     * Test that list all merges values and makes them unique.
     */
    public function testListAll() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->method('listAll')
            ->with('node.')
            ->willReturn([
            'node.type',
        ]);
        $b = $this->createMock(StorageInterface::class);
        $b->method('listAll')
            ->with('node.')
            ->willReturn([
            'node.type',
            'node.id',
        ]);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertEquals([
            0 => 'node.type',
            2 => 'node.id',
        ], $storage->listAll('node.'));
    }
    
    /**
     * Test creating a collection passes the name through to the child storages.
     */
    public function testCreateCollection() : void {
        $collection_name = 'collection';
        $a = $this->createMock(StorageInterface::class);
        $b = $this->createMock(StorageInterface::class);
        
        /** @var \PHPUnit\Framework\MockObject\MockObject $mock */
        foreach ([
            $a,
            $b,
        ] as $mock) {
            $mock->expects($this->once())
                ->method('createCollection')
                ->with($collection_name)
                ->willReturn(new NullStorage($collection_name));
        }
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $new = $storage->createCollection($collection_name);
        $this->assertInstanceOf(RecipeConfigStorageWrapper::class, $new);
        $this->assertEquals($collection_name, $new->getCollectionName());
        $this->assertNotEquals($storage, $new);
    }
    
    /**
     * Test that we merge and return only unique collection names.
     */
    public function testGetAllCollectionNames() : void {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('getAllCollectionNames')
            ->willReturn([
            'collection_1',
            'collection_2',
        ]);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->once())
            ->method('getAllCollectionNames')
            ->willReturn([
            'collection_3',
            'collection_1',
            'collection_2',
        ]);
        $storage = new RecipeConfigStorageWrapper($a, $b);
        $this->assertEquals([
            'collection_1',
            'collection_2',
            'collection_3',
        ], $storage->getAllCollectionNames());
    }
    
    /**
     * Test the collection name is stored properly.
     */
    public function testGetCollection() : void {
        $a = $this->createMock(StorageInterface::class);
        $b = $this->createMock(StorageInterface::class);
        $storage = new RecipeConfigStorageWrapper($a, $b, 'collection');
        $this->assertEquals('collection', $storage->getCollectionName());
    }
    
    /**
     * Generate two storages where the second storage should return a value.
     *
     * @param bool $b_return
     *   The return value for storage $b's exist method.
     *
     * @return \Drupal\Core\Config\StorageInterface[]
     *   An array of two mocked storages.
     */
    private function generateStorages(bool $b_return) : array {
        $a = $this->createMock(StorageInterface::class);
        $a->expects($this->once())
            ->method('exists')
            ->with('a_key')
            ->willReturn(FALSE);
        $b = $this->createMock(StorageInterface::class);
        $b->expects($this->once())
            ->method('exists')
            ->with('a_key')
            ->willReturn($b_return);
        return [
            $a,
            $b,
        ];
    }

}