from datetime import datetime
from pytest import fixture

from sqlalchemy.exc import IntegrityError
import sqlalchemy.orm

import data.database as db


@fixture(scope='session')
def db_session() -> db.dal.Session:
    db.dal.connect()
    yield db.dal.Session()
    if hasattr(db.dal, 'engine') and db.dal.engine:
        db.dal.engine.dispose()
        db.dal.engine.pool.recreate()


@fixture(scope='function')
def session(db_session) -> db.dal.Session:
    """Provides a transactional scope around each test."""
    connection = db_session.connection()
    transaction = connection.begin()

    # bind the session to this specific connection
    db_session.bind = connection

    yield db_session

    # roll all changed that occurred back
    transaction.rollback()
    connection.close()


def test_base() -> None:
    """Test to ensure db.Base() is a sqlalchemy DeclarativeBase object."""
    assert isinstance(db.Base(), sqlalchemy.orm.DeclarativeBase)


def test_powerball_draw_by_date_blank(session) -> None:
    """
        Test that a null record is returned when no date is provided and that no dateless
        records can exist in the table.
    """
    with session:
        blank_results = session.query(db.PowerballDraw).filter_by(draw_date='').all()
        assert blank_results == []


def test_powerball_draw_by_date(session) -> None:
    """Test to be sure we can find the first draw in the table by date."""
    with session:
        date = datetime(2010, 2, 3).date()
        draw = db.PowerballDraw(draw_date=date, main_ball1=17, main_ball2=22, main_ball3=36, main_ball4=37,
             main_ball5=52, powerball=24, power_play=2)

        record = session.query(db.PowerballDraw).filter_by(draw_date=date).first()
        assert record == draw


def test_powerball_draw_integrity(session) -> None:
    """Test that a proper error is received when a duplicate value insertion is attempted."""
    with session:
        date = datetime.strptime('02/03/2010','%m/%d/%Y').date()
        draw = db.PowerballDraw(draw_date=date, main_ball1=17, main_ball2=22, main_ball3=36, main_ball4=37,
                main_ball5=52, powerball=24, power_play=2)

        try:
            session.add(draw)
            session.commit()
        except IntegrityError:
            assert True
        finally:
            session.rollback()
            session.close()


def test_powerball_repr_and_str(session) -> None:
    """Test the __repr__ and __str__ methods of PowerballDraw objects."""
    with session:
        date = datetime(2010, 2, 3).date()
        record = session.query(db.PowerballDraw).filter_by(draw_date=date).first()
        assert str(record) == '2010-02-03, [17, 22, 36, 37, 52], 24, 2x'
        assert repr(record) == 'PowerballDraw(self.draw_date=datetime.date(2010, 2, 3), self.main_ball1=17, ' \
                'self.main_ball2=22, self.main_ball3=36, self.main_ball4=37, self.main_ball5=52, ' \
                'self.powerball=24, self.power_play=2)'