# Copyright 2016 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import datetime

import pytest

from google.auth import _helpers
from google.auth import credentials


class CredentialsImpl(credentials.Credentials):
    def refresh(self, request):
        self.token = request


def test_credentials_constructor():
    credentials = CredentialsImpl()
    assert not credentials.token
    assert not credentials.expiry
    assert not credentials.expired
    assert not credentials.valid


def test_expired_and_valid():
    credentials = CredentialsImpl()
    credentials.token = 'token'

    assert credentials.valid
    assert not credentials.expired

    # Set the expiration to one second more than now plus the clock skew
    # accomodation. These credentials should be valid.
    credentials.expiry = (
        datetime.datetime.utcnow() +
        _helpers.CLOCK_SKEW +
        datetime.timedelta(seconds=1))

    assert credentials.valid
    assert not credentials.expired

    # Set the credentials expiration to now. Because of the clock skew
    # accomodation, these credentials should report as expired.
    credentials.expiry = datetime.datetime.utcnow()

    assert not credentials.valid
    assert credentials.expired


def test_before_request():
    credentials = CredentialsImpl()
    request = 'token'
    headers = {}

    # First call should call refresh, setting the token.
    credentials.before_request(request, 'http://example.com', 'GET', headers)
    assert credentials.valid
    assert credentials.token == 'token'
    assert headers['authorization'] == 'Bearer token'

    request = 'token2'
    headers = {}

    # Second call shouldn't call refresh.
    credentials.before_request(request, 'http://example.com', 'GET', headers)
    assert credentials.valid
    assert credentials.token == 'token'
    assert headers['authorization'] == 'Bearer token'


def test_anonymous_credentials_ctor():
    anon = credentials.AnonymousCredentials()
    assert anon.token is None
    assert anon.expiry is None
    assert not anon.expired
    assert anon.valid


def test_anonymous_credentials_refresh():
    anon = credentials.AnonymousCredentials()
    request = object()
    with pytest.raises(ValueError):
        anon.refresh(request)


def test_anonymous_credentials_apply_default():
    anon = credentials.AnonymousCredentials()
    headers = {}
    anon.apply(headers)
    assert headers == {}
    with pytest.raises(ValueError):
        anon.apply(headers, token='TOKEN')


def test_anonymous_credentials_before_request():
    anon = credentials.AnonymousCredentials()
    request = object()
    method = 'GET'
    url = 'https://example.com/api/endpoint'
    headers = {}
    anon.before_request(request, method, url, headers)
    assert headers == {}


class ReadOnlyScopedCredentialsImpl(
        credentials.ReadOnlyScoped, CredentialsImpl):
    @property
    def requires_scopes(self):
        return super(ReadOnlyScopedCredentialsImpl, self).requires_scopes


def test_readonly_scoped_credentials_constructor():
    credentials = ReadOnlyScopedCredentialsImpl()
    assert credentials._scopes is None


def test_readonly_scoped_credentials_scopes():
    credentials = ReadOnlyScopedCredentialsImpl()
    credentials._scopes = ['one', 'two']
    assert credentials.scopes == ['one', 'two']
    assert credentials.has_scopes(['one'])
    assert credentials.has_scopes(['two'])
    assert credentials.has_scopes(['one', 'two'])
    assert not credentials.has_scopes(['three'])


def test_readonly_scoped_credentials_requires_scopes():
    credentials = ReadOnlyScopedCredentialsImpl()
    assert not credentials.requires_scopes


class RequiresScopedCredentialsImpl(credentials.Scoped, CredentialsImpl):
    def __init__(self, scopes=None):
        super(RequiresScopedCredentialsImpl, self).__init__()
        self._scopes = scopes

    @property
    def requires_scopes(self):
        return not self.scopes

    def with_scopes(self, scopes):
        return RequiresScopedCredentialsImpl(scopes=scopes)


def test_create_scoped_if_required_scoped():
    unscoped_credentials = RequiresScopedCredentialsImpl()
    scoped_credentials = credentials.with_scopes_if_required(
        unscoped_credentials, ['one', 'two'])

    assert scoped_credentials is not unscoped_credentials
    assert not scoped_credentials.requires_scopes
    assert scoped_credentials.has_scopes(['one', 'two'])


def test_create_scoped_if_required_not_scopes():
    unscoped_credentials = CredentialsImpl()
    scoped_credentials = credentials.with_scopes_if_required(
        unscoped_credentials, ['one', 'two'])

    assert scoped_credentials is unscoped_credentials