"""Test for the HMAC Calculation."""

import pytest

from owsrequest import hmac


@pytest.fixture(params=['body of the request', b'body of the request', ''])
def fixture_body(request):
    """Return the body of a request."""
    return request.param


def test_secret_creation():
    """Test creating a secret."""
    assert len(hmac.create_secret()) == hmac.SECRET_SIZE
    assert hmac.create_secret() != hmac.create_secret()
    assert set(hmac.create_secret()) <= set(hmac.SECRET_CHARACTERS)


def test_create_secret_with_size():
    """Test creating a secret with a different size."""
    secret_size = 40
    assert secret_size != hmac.SECRET_SIZE
    assert len(hmac.create_secret(size=secret_size)) == secret_size


def test_calculating_hmac(fixture_body):
    """Test calculating a HMAC."""
    # For this case, it doesn't really matter that the body contains a value
    # or not
    if not fixture_body:
        return

    secret = 'foobar'
    calculated_hmac = hmac.calculate(
        secret, 'GET', fixture_body,
        '0d0d5248-1b89-11e6-9571-f45c89a67659',
        '/endpoint?some_query_params=some_value')

    assert calculated_hmac == '714011aadf6b3bf38cfffb532590d03e98cdd7bb'


def test_calculating_body_md5(fixture_body):
    """Test calculating a body's md5."""
    response = hmac.calculate_body_md5(fixture_body)
    if fixture_body:
        assert response
        assert response == 'ebb2d30c1e0859a597acd666e59fa41f'
    else:
        # verifies it is an empty string.
        assert isinstance(response, str)
        assert not response