"""Test if the sql db can be copied."""
import os
from collections.abc import Generator

import pandas as pd
import pytest
from sqlalchemy.engine import Engine
from sqlalchemy.orm import Session

from aki_prj23_transparenzregister.utils.sql.connector import Base, get_session, init_db
from aki_prj23_transparenzregister.utils.sql.copy_sql import (
    copy_db_cli,
    transfer_db_function,
)


@pytest.fixture()
def destination_db() -> Generator[Session, None, None]:
    """Generates a db Session to a sqlite db to copy data to."""
    if os.path.exists("secondary.db"):
        os.remove("secondary.db")
    db = get_session("sqlite:///secondary.db")
    init_db(db)
    yield db
    db.close()
    bind = db.bind
    assert isinstance(bind, Engine)
    bind.dispose()
    os.remove("secondary.db")


def test_transfer_db(full_db: Session, destination_db: Session) -> None:
    """Tests if the data transfer between two sql tables works."""
    transfer_db_function(source=full_db, destination=destination_db)
    sbind = full_db.bind
    dbind = destination_db.bind
    assert isinstance(sbind, Engine)
    assert isinstance(dbind, Engine)
    assert Base.metadata.sorted_tables
    for table in Base.metadata.sorted_tables + ["company"]:
        pd.testing.assert_frame_equal(
            pd.read_sql_table(str(table), dbind),
            pd.read_sql_table(str(table), sbind),
        )


def test_copy_db_cli_help1() -> None:
    """Tests if the help argument exits the software gracefully."""
    with pytest.raises(SystemExit):
        copy_db_cli(["-h"])


def test_copy_db_cli_help2() -> None:
    """Tests if the help argument exits the software gracefully."""
    with pytest.raises(SystemExit):
        copy_db_cli(["eskse", "-h", "asdf"])