class AlterTest

class AlterTest extends DatabaseTestBase {
    
    /**
     * Tests that we can do basic alters.
     */
    public function testSimpleAlter() : void {
        $query = $this->connection
            ->select('test');
        $query->addField('test', 'name');
        $query->addField('test', 'age', 'age');
        $query->addTag('database_test_alter_add_range');
        $result = $query->execute()
            ->fetchAll();
        $this->assertCount(2, $result, 'Returned the correct number of rows.');
    }
    
    /**
     * Tests that we can alter the joins on a query.
     */
    public function testAlterWithJoin() : void {
        $query = $this->connection
            ->select('test_task');
        $tid_field = $query->addField('test_task', 'tid');
        $task_field = $query->addField('test_task', 'task');
        $query->orderBy($task_field);
        $query->addTag('database_test_alter_add_join');
        $result = $query->execute();
        $records = $result->fetchAll();
        $this->assertCount(2, $records, 'Returned the correct number of rows.');
        $this->assertEquals('George', $records[0]->name, 'Correct data retrieved.');
        $this->assertEquals(4, $records[0]->{$tid_field}, 'Correct data retrieved.');
        $this->assertEquals('sing', $records[0]->{$task_field}, 'Correct data retrieved.');
        $this->assertEquals('George', $records[1]->name, 'Correct data retrieved.');
        $this->assertEquals(5, $records[1]->{$tid_field}, 'Correct data retrieved.');
        $this->assertEquals('sleep', $records[1]->{$task_field}, 'Correct data retrieved.');
    }
    
    /**
     * Tests that we can alter a query's conditionals.
     */
    public function testAlterChangeConditional() : void {
        $query = $this->connection
            ->select('test_task');
        $tid_field = $query->addField('test_task', 'tid');
        $pid_field = $query->addField('test_task', 'pid');
        $task_field = $query->addField('test_task', 'task');
        $people_alias = $query->join('test', 'people', "[test_task].[pid] = [people].[id]");
        $name_field = $query->addField($people_alias, 'name', 'name');
        $query->condition('test_task.tid', '1');
        $query->orderBy($tid_field);
        $query->addTag('database_test_alter_change_conditional');
        $result = $query->execute();
        $records = $result->fetchAll();
        $this->assertCount(1, $records, 'Returned the correct number of rows.');
        $this->assertEquals('John', $records[0]->{$name_field}, 'Correct data retrieved.');
        $this->assertEquals(2, $records[0]->{$tid_field}, 'Correct data retrieved.');
        $this->assertEquals(1, $records[0]->{$pid_field}, 'Correct data retrieved.');
        $this->assertEquals('sleep', $records[0]->{$task_field}, 'Correct data retrieved.');
    }
    
    /**
     * Tests that we can alter the fields of a query.
     */
    public function testAlterChangeFields() : void {
        $query = $this->connection
            ->select('test');
        $name_field = $query->addField('test', 'name');
        $age_field = $query->addField('test', 'age', 'age');
        $query->orderBy('name');
        $query->addTag('database_test_alter_change_fields');
        $record = $query->execute()
            ->fetch();
        $this->assertEquals('George', $record->{$name_field}, 'Correct data retrieved.');
        $this->assertFalse(isset($record->{$age_field}), 'Age field not found, as intended.');
    }
    
    /**
     * Tests that we can alter expressions in the query.
     */
    public function testAlterExpression() : void {
        $query = $this->connection
            ->select('test');
        $name_field = $query->addField('test', 'name');
        $age_field = $query->addExpression("[age]*2", 'double_age');
        $query->condition('age', 27);
        $query->addTag('database_test_alter_change_expressions');
        $result = $query->execute();
        // Ensure that we got the right record.
        $record = $result->fetch();
        $this->assertEquals('George', $record->{$name_field}, 'Fetched name is correct.');
        $this->assertEquals(27 * 3, $record->{$age_field}, 'Fetched age expression is correct.');
    }
    
    /**
     * Tests that we can remove a range() value from a query.
     *
     * This also tests hook_query_TAG_alter().
     */
    public function testAlterRemoveRange() : void {
        $query = $this->connection
            ->select('test');
        $query->addField('test', 'name');
        $query->addField('test', 'age', 'age');
        $query->range(0, 2);
        $query->addTag('database_test_alter_remove_range');
        $num_records = count($query->execute()
            ->fetchAll());
        $this->assertEquals(4, $num_records, 'Returned the correct number of rows.');
    }
    
    /**
     * Tests that we can do basic alters on subqueries.
     */
    public function testSimpleAlterSubquery() : void {
        // Create a sub-query with an alter tag.
        $subquery = $this->connection
            ->select('test', 'p');
        $subquery->addField('p', 'name');
        $subquery->addField('p', 'id');
        // Pick out George.
        $subquery->condition('age', 27);
        $subquery->addExpression("[age]*2", 'double_age');
        // This query alter should change it to age * 3.
        $subquery->addTag('database_test_alter_change_expressions');
        // Create a main query and join to sub-query.
        $query = $this->connection
            ->select('test_task', 'tt');
        $query->join($subquery, 'pq', '[pq].[id] = [tt].[pid]');
        $age_field = $query->addField('pq', 'double_age');
        $name_field = $query->addField('pq', 'name');
        $record = $query->execute()
            ->fetch();
        $this->assertEquals('George', $record->{$name_field}, 'Fetched name is correct.');
        $this->assertEquals(27 * 3, $record->{$age_field}, 'Fetched age expression is correct.');
    }

}