class LinearHistoryTest

class LinearHistoryTest extends UnitTestCase {
    
    /**
     * The key used store of all the checkpoint names in state.
     *
     * @see \Drupal\Core\Config\Checkpoint\Checkpoints::CHECKPOINT_KEY
     */
    private const CHECKPOINT_KEY = 'config.checkpoints';
    
    /**
     * @covers ::add
     * @covers ::count
     * @covers ::getActiveCheckpoint
     * @covers \Drupal\Core\Config\Checkpoint\Checkpoint
     */
    public function testAdd() : void {
        $state = $this->prophesize(StateInterface::class);
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn([]);
        $state->set(self::CHECKPOINT_KEY, Argument::any())
            ->willReturn(NULL);
        $time = $this->prophesize(TimeInterface::class);
        $time->getCurrentTime()
            ->willReturn(1701539520, 1701539994);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->assertCount(0, $checkpoints);
        $this->assertNull($checkpoints->getActiveCheckpoint());
        $checkpoint = $checkpoints->add('hash1', 'Label');
        $this->assertSame('hash1', $checkpoint->id);
        $this->assertSame('Label', $checkpoint->label);
        $this->assertNull($checkpoint->parent);
        $this->assertSame(1701539520, $checkpoint->timestamp);
        $this->assertCount(1, $checkpoints);
        $this->assertSame('hash1', $checkpoints->getActiveCheckpoint()?->id);
        // Test that on the second call to add the ancestor is set correctly.
        $checkpoint2 = $checkpoints->add('hash2', new FormattableMarkup('Another label', []));
        $this->assertSame('hash2', $checkpoint2->id);
        $this->assertSame('Another label', (string) $checkpoint2->label);
        $this->assertSame($checkpoint->id, $checkpoint2->parent);
        $this->assertSame(1701539994, $checkpoint2->timestamp);
        $this->assertCount(2, $checkpoints);
        $this->assertSame('hash2', $checkpoints->getActiveCheckpoint()?->id);
        // Test that the checkpoints object can be iterated over.
        $i = 0;
        foreach ($checkpoints as $value) {
            $i++;
            $this->assertInstanceOf(Checkpoint::class, $value);
            $this->assertSame('hash' . $i, $value->id);
        }
    }
    
    /**
     * @covers ::add
     */
    public function testAddException() : void {
        $state = $this->prophesize(StateInterface::class);
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn([]);
        $state->set(self::CHECKPOINT_KEY, Argument::any())
            ->willReturn(NULL);
        $time = $this->prophesize(TimeInterface::class);
        $time->getCurrentTime()
            ->willReturn(1701539520, 1701539994);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $checkpoints->add('hash1', 'Label');
        // Add another checkpoint with the same ID and an exception should be
        // triggered.
        $this->expectException(CheckpointExistsException::class);
        $this->expectExceptionMessage('Cannot create a checkpoint with the ID "hash1" as it already exists');
        $checkpoints->add('hash1', 'Label');
    }
    
    /**
     * @covers ::delete
     */
    public function testDeleteAll() : void {
        $state = $this->prophesize(StateInterface::class);
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn([
            'hash1' => new Checkpoint('hash1', 'One', 1701539510, NULL),
            'hash2' => new Checkpoint('hash2', 'Two', 1701539520, 'hash1'),
            'hash3' => new Checkpoint('hash3', 'Three', 1701539530, 'hash2'),
        ]);
        $state->delete(self::CHECKPOINT_KEY)
            ->willReturn();
        $time = $this->prophesize(TimeInterface::class);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->assertCount(3, $checkpoints);
        $this->assertSame('hash3', $checkpoints->getActiveCheckpoint()?->id);
        $checkpoints->deleteAll();
        $this->assertCount(0, $checkpoints);
        $this->assertNull($checkpoints->getActiveCheckpoint());
    }
    
    /**
     * @covers ::delete
     */
    public function testDelete() : void {
        $state = $this->prophesize(StateInterface::class);
        $test_data = [
            'hash1' => new Checkpoint('hash1', 'One', 1701539510, NULL),
            'hash2' => new Checkpoint('hash2', 'Two', 1701539520, 'hash1'),
            'hash3' => new Checkpoint('hash3', 'Three', 1701539530, 'hash2'),
        ];
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn($test_data);
        unset($test_data['hash1'], $test_data['hash2']);
        $state->set(self::CHECKPOINT_KEY, $test_data)
            ->willReturn();
        $time = $this->prophesize(TimeInterface::class);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->assertCount(3, $checkpoints);
        $this->assertSame('hash3', $checkpoints->getActiveCheckpoint()?->id);
        $checkpoints->delete('hash2');
        $this->assertCount(1, $checkpoints);
        $this->assertSame('hash3', $checkpoints->getActiveCheckpoint()?->id);
    }
    
    /**
     * @covers ::delete
     */
    public function testDeleteException() : void {
        $state = $this->prophesize(StateInterface::class);
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn([]);
        $time = $this->prophesize(TimeInterface::class);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->expectException(UnknownCheckpointException::class);
        $this->expectExceptionMessage('Cannot delete a checkpoint with the ID "foo" as it does not exist');
        $checkpoints->delete('foo');
    }
    
    /**
     * @covers ::getParents
     */
    public function testGetParents() : void {
        $state = $this->prophesize(StateInterface::class);
        $test_data = [
            'hash1' => new Checkpoint('hash1', 'One', 1701539510, NULL),
            'hash2' => new Checkpoint('hash2', 'Two', 1701539520, 'hash1'),
            'hash3' => new Checkpoint('hash3', 'Three', 1701539530, 'hash2'),
        ];
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn($test_data);
        $time = $this->prophesize(TimeInterface::class);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->assertSame([
            'hash2' => $test_data['hash2'],
            'hash1' => $test_data['hash1'],
        ], iterator_to_array($checkpoints->getParents('hash3')));
        $this->assertSame([
            'hash1' => $test_data['hash1'],
        ], iterator_to_array($checkpoints->getParents('hash2')));
        $this->assertSame([], iterator_to_array($checkpoints->getParents('hash1')));
    }
    
    /**
     * @covers ::getParents
     */
    public function testGetParentsException() : void {
        $state = $this->prophesize(StateInterface::class);
        $test_data = [
            'hash1' => new Checkpoint('hash1', 'One', 1701539510, NULL),
            'hash2' => new Checkpoint('hash2', 'Two', 1701539520, 'hash1'),
        ];
        $state->get(self::CHECKPOINT_KEY, [])
            ->willReturn($test_data);
        $time = $this->prophesize(TimeInterface::class);
        $checkpoints = new LinearHistory($state->reveal(), $time->reveal());
        $this->expectException(UnknownCheckpointException::class);
        $this->expectExceptionMessage('The checkpoint "hash3" does not exist');
        iterator_to_array($checkpoints->getParents('hash3'));
    }

}