class HighWaterTest

class HighWaterTest extends MigrateTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'user',
        'node',
        'migrate',
        'migrate_high_water_test',
        'field',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create source test table.
        $this->sourceDatabase
            ->schema()
            ->createTable('high_water_node', [
            'fields' => [
                'id' => [
                    'description' => 'Serial',
                    'type' => 'serial',
                    'unsigned' => TRUE,
                    'not null' => TRUE,
                ],
                'changed' => [
                    'description' => 'Highwater',
                    'type' => 'int',
                    'unsigned' => TRUE,
                ],
                'title' => [
                    'description' => 'Title',
                    'type' => 'varchar',
                    'length' => 128,
                    'not null' => TRUE,
                    'default' => '',
                ],
            ],
            'primary key' => [
                'id',
            ],
            'description' => 'Contains nodes to import',
        ]);
        // Add 3 items to source table.
        $this->sourceDatabase
            ->insert('high_water_node')
            ->fields([
            'title',
            'changed',
        ])
            ->values([
            'title' => 'Item 1',
            'changed' => 1,
        ])
            ->values([
            'title' => 'Item 2',
            'changed' => 2,
        ])
            ->values([
            'title' => 'Item 3',
            'changed' => 3,
        ])
            ->execute();
        $this->installEntitySchema('node');
        $this->installEntitySchema('user');
        $this->installSchema('node', 'node_access');
        $this->executeMigration('high_water_test');
    }
    
    /**
     * Tests high water property of SqlBase.
     */
    public function testHighWater() : void {
        // Assert all of the nodes have been imported.
        $this->assertNodeExists('Item 1');
        $this->assertNodeExists('Item 2');
        $this->assertNodeExists('Item 3');
        // Update Item 1 setting its high_water_property to value that is below
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 1 updated',
            'changed' => 2,
        ])
            ->condition('title', 'Item 1')
            ->execute();
        // Update Item 2 setting its high_water_property to value equal to
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 2 updated',
            'changed' => 3,
        ])
            ->condition('title', 'Item 2')
            ->execute();
        // Update Item 3 setting its high_water_property to value that is above
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 3 updated',
            'changed' => 4,
        ])
            ->condition('title', 'Item 3')
            ->execute();
        // Execute migration again.
        $this->executeMigration('high_water_test');
        // Item with lower high water should not be updated.
        $this->assertNodeExists('Item 1');
        $this->assertNodeDoesNotExist('Item 1 updated');
        // Item with equal high water should not be updated.
        $this->assertNodeExists('Item 2');
        $this->assertNodeDoesNotExist('Item 2 updated');
        // Item with greater high water should be updated.
        $this->assertNodeExists('Item 3 updated');
        $this->assertNodeDoesNotExist('Item 3');
    }
    
    /**
     * Tests that the high water value can be 0.
     */
    public function testZeroHighwater() : void {
        // Assert all of the nodes have been imported.
        $this->assertNodeExists('Item 1');
        $this->assertNodeExists('Item 2');
        $this->assertNodeExists('Item 3');
        $migration = $this->container
            ->get('plugin.manager.migration')
            ->CreateInstance('high_water_test', []);
        $source = $migration->getSourcePlugin();
        $source->rewind();
        $count = 0;
        while ($source->valid()) {
            $count++;
            $source->next();
        }
        // Expect no rows as everything is below the high water mark.
        $this->assertSame(0, $count);
        // Test resetting the high water mark to 0.
        $this->container
            ->get('keyvalue')
            ->get('migrate:high_water')
            ->set('high_water_test', 0);
        $migration = $this->container
            ->get('plugin.manager.migration')
            ->CreateInstance('high_water_test', []);
        $source = $migration->getSourcePlugin();
        $source->rewind();
        $count = 0;
        while ($source->valid()) {
            $count++;
            $source->next();
        }
        $this->assertSame(3, $count);
    }
    
    /**
     * Tests that deleting the high water value causes all rows to be reimported.
     */
    public function testNullHighwater() : void {
        // Assert all of the nodes have been imported.
        $this->assertNodeExists('Item 1');
        $this->assertNodeExists('Item 2');
        $this->assertNodeExists('Item 3');
        $migration = $this->container
            ->get('plugin.manager.migration')
            ->CreateInstance('high_water_test', []);
        $source = $migration->getSourcePlugin();
        $source->rewind();
        $count = 0;
        while ($source->valid()) {
            $count++;
            $source->next();
        }
        // Expect no rows as everything is below the high water mark.
        $this->assertSame(0, $count);
        // Test resetting the high water mark.
        $this->container
            ->get('keyvalue')
            ->get('migrate:high_water')
            ->delete('high_water_test');
        $migration = $this->container
            ->get('plugin.manager.migration')
            ->CreateInstance('high_water_test', []);
        $source = $migration->getSourcePlugin();
        $source->rewind();
        $count = 0;
        while ($source->valid()) {
            $count++;
            $source->next();
        }
        $this->assertSame(3, $count);
    }
    
    /**
     * Tests high water property of SqlBase when rows marked for update.
     */
    public function testHighWaterUpdate() : void {
        // Assert all of the nodes have been imported.
        $this->assertNodeExists('Item 1');
        $this->assertNodeExists('Item 2');
        $this->assertNodeExists('Item 3');
        // Update Item 1 setting its high_water_property to value that is below
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 1 updated',
            'changed' => 2,
        ])
            ->condition('title', 'Item 1')
            ->execute();
        // Update Item 2 setting its high_water_property to value equal to
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 2 updated',
            'changed' => 3,
        ])
            ->condition('title', 'Item 2')
            ->execute();
        // Update Item 3 setting its high_water_property to value that is above
        // current high water mark.
        $this->sourceDatabase
            ->update('high_water_node')
            ->fields([
            'title' => 'Item 3 updated',
            'changed' => 4,
        ])
            ->condition('title', 'Item 3')
            ->execute();
        // Set all rows as needing an update.
        $id_map = $this->getMigration('high_water_test')
            ->getIdMap();
        $id_map->prepareUpdate();
        $this->executeMigration('high_water_test');
        // Item with lower high water should be updated.
        $this->assertNodeExists('Item 1 updated');
        $this->assertNodeDoesNotExist('Item 1');
        // Item with equal high water should be updated.
        $this->assertNodeExists('Item 2 updated');
        $this->assertNodeDoesNotExist('Item 2');
        // Item with greater high water should be updated.
        $this->assertNodeExists('Item 3 updated');
        $this->assertNodeDoesNotExist('Item 3');
    }
    
    /**
     * Assert that node with given title exists.
     *
     * @param string $title
     *   Title of the node.
     *
     * @internal
     */
    protected function assertNodeExists(string $title) : void {
        self::assertTrue($this->nodeExists($title));
    }
    
    /**
     * Assert that node with given title does not exist.
     *
     * @param string $title
     *   Title of the node.
     *
     * @internal
     */
    protected function assertNodeDoesNotExist(string $title) : void {
        self::assertFalse($this->nodeExists($title));
    }
    
    /**
     * Checks if node with given title exists.
     *
     * @param string $title
     *   Title of the node.
     *
     * @return bool
     */
    protected function nodeExists($title) : bool {
        $query = \Drupal::entityQuery('node')->accessCheck(FALSE);
        $result = $query->condition('title', $title)
            ->range(0, 1)
            ->execute();
        return !empty($result);
    }

}