import io
import sys

import pytest
from flexmock import flexmock

from borgmatic.hooks.credential import systemd as module


@pytest.mark.parametrize('credential_parameters', ((), ('foo', 'bar')))
def test_load_credential_with_invalid_credential_parameters_raises(credential_parameters):
    flexmock(module.os.environ).should_receive('get').never()

    with pytest.raises(ValueError):
        module.load_credential(
            hook_config={},
            config={},
            credential_parameters=credential_parameters,
        )


def test_load_credential_without_credentials_directory_raises():
    flexmock(module.os.environ).should_receive('get').with_args('CREDENTIALS_DIRECTORY').and_return(
        None,
    )

    with pytest.raises(ValueError):
        module.load_credential(hook_config={}, config={}, credential_parameters=('mycredential',))


def test_load_credential_with_invalid_credential_name_raises():
    flexmock(module.os.environ).should_receive('get').with_args('CREDENTIALS_DIRECTORY').and_return(
        '/var',
    )

    with pytest.raises(ValueError):
        module.load_credential(
            hook_config={},
            config={},
            credential_parameters=('../../my!@#$credential',),
        )


def test_load_credential_reads_named_credential_from_file():
    flexmock(module.os.environ).should_receive('get').with_args('CREDENTIALS_DIRECTORY').and_return(
        '/var',
    )
    credential_stream = io.StringIO('password')
    credential_stream.name = '/var/borgmatic.pw'
    builtins = flexmock(sys.modules['builtins'])
    builtins.should_receive('open').with_args('/var/borgmatic.pw', encoding='utf-8').and_return(
        credential_stream
    )

    assert (
        module.load_credential(hook_config={}, config={}, credential_parameters=('borgmatic.pw',))
        == 'password'
    )


def test_load_credential_with_file_not_found_error_raises():
    flexmock(module.os.environ).should_receive('get').with_args('CREDENTIALS_DIRECTORY').and_return(
        '/var',
    )
    builtins = flexmock(sys.modules['builtins'])
    builtins.should_receive('open').with_args('/var/mycredential', encoding='utf-8').and_raise(
        FileNotFoundError
    )

    with pytest.raises(ValueError):
        module.load_credential(hook_config={}, config={}, credential_parameters=('mycredential',))