# Copyright 2014 Google LLC
#
# 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 json
import unittest

import mock
import requests
from six.moves import http_client


class TestConnection(unittest.TestCase):

    @staticmethod
    def _get_target_class():
        from google.cloud._http import Connection

        return Connection

    def _make_one(self, *args, **kw):
        return self._get_target_class()(*args, **kw)

    def test_constructor(self):
        client = object()
        conn = self._make_one(client)
        self.assertIs(conn._client, client)

    def test_credentials_property(self):
        client = mock.Mock(spec=['_credentials'])
        conn = self._make_one(client)
        self.assertIs(conn.credentials, client._credentials)

    def test_http_property(self):
        client = mock.Mock(spec=['_http'])
        conn = self._make_one(client)
        self.assertIs(conn.http, client._http)

    def test_user_agent_format(self):
        from pkg_resources import get_distribution

        expected_ua = 'gcloud-python/{0}'.format(
            get_distribution('google-cloud-core').version)
        conn = self._make_one(object())
        self.assertEqual(conn.USER_AGENT, expected_ua)


def make_response(status=http_client.OK, content=b'', headers={}):
    response = requests.Response()
    response.status_code = status
    response._content = content
    response.headers = headers
    response.request = requests.Request()
    return response


def make_requests_session(responses):
    session = mock.create_autospec(requests.Session, instance=True)
    session.request.side_effect = responses
    return session


class TestJSONConnection(unittest.TestCase):
    JSON_HEADERS = {'content-type': 'application/json'}
    EMPTY_JSON_RESPONSE = make_response(content=b'{}', headers=JSON_HEADERS)

    @staticmethod
    def _get_target_class():
        from google.cloud._http import JSONConnection

        return JSONConnection

    def _make_one(self, *args, **kw):
        return self._get_target_class()(*args, **kw)

    def _make_mock_one(self, *args, **kw):
        class MockConnection(self._get_target_class()):
            API_URL_TEMPLATE = '{api_base_url}/mock/{api_version}{path}'
            API_BASE_URL = 'http://mock'
            API_VERSION = 'vMOCK'
        return MockConnection(*args, **kw)

    def test_class_defaults(self):
        klass = self._get_target_class()
        self.assertIsNone(klass.API_URL_TEMPLATE)
        self.assertIsNone(klass.API_BASE_URL)
        self.assertIsNone(klass.API_VERSION)

    def test_constructor(self):
        client = object()
        conn = self._make_one(client)
        self.assertIs(conn._client, client)

    def test_build_api_url_no_extra_query_params(self):
        client = object()
        conn = self._make_mock_one(client)
        # Intended to emulate self.mock_template
        URI = '/'.join([
            conn.API_BASE_URL,
            'mock',
            conn.API_VERSION,
            'foo',
        ])
        self.assertEqual(conn.build_api_url('/foo'), URI)

    def test_build_api_url_w_extra_query_params(self):
        from six.moves.urllib.parse import parse_qs
        from six.moves.urllib.parse import urlsplit

        client = object()
        conn = self._make_mock_one(client)
        uri = conn.build_api_url('/foo', {
            'bar': 'baz',
            'qux': ['quux', 'corge']
        })

        scheme, netloc, path, qs, _ = urlsplit(uri)
        self.assertEqual('%s://%s' % (scheme, netloc), conn.API_BASE_URL)
        # Intended to emulate mock_template
        PATH = '/'.join([
            '',
            'mock',
            conn.API_VERSION,
            'foo',
        ])
        self.assertEqual(path, PATH)
        parms = dict(parse_qs(qs))
        self.assertEqual(parms['bar'], ['baz'])
        self.assertEqual(parms['qux'], ['quux', 'corge'])

    def test__make_request_no_data_no_content_type_no_headers(self):
        http = make_requests_session([make_response()])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_one(client)
        url = 'http://example.com/test'

        response = conn._make_request('GET', url)

        self.assertEqual(response.status_code, http_client.OK)
        self.assertEqual(response.content, b'')

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'User-Agent': conn.USER_AGENT,
        }
        http.request.assert_called_once_with(
            method='GET', url=url, headers=expected_headers, data=None)

    def test__make_request_w_data_no_extra_headers(self):
        http = make_requests_session([make_response()])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_one(client)
        url = 'http://example.com/test'
        data = b'data'

        conn._make_request('GET', url, data, 'application/json')

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'Content-Type': 'application/json',
            'User-Agent': conn.USER_AGENT,
        }
        http.request.assert_called_once_with(
            method='GET', url=url, headers=expected_headers, data=data)

    def test__make_request_w_extra_headers(self):
        http = make_requests_session([make_response()])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_one(client)

        url = 'http://example.com/test'
        conn._make_request('GET', url, headers={'X-Foo': 'foo'})

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'X-Foo': 'foo',
            'User-Agent': conn.USER_AGENT,
        }
        http.request.assert_called_once_with(
            method='GET', url=url, headers=expected_headers, data=None)

    def test_api_request_defaults(self):
        http = make_requests_session([
            make_response(content=b'{}', headers=self.JSON_HEADERS)])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)
        path = '/path/required'

        self.assertEqual(conn.api_request('GET', path), {})

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'User-Agent': conn.USER_AGENT,
        }
        expected_url = '{base}/mock/{version}{path}'.format(
            base=conn.API_BASE_URL,
            version=conn.API_VERSION,
            path=path)
        http.request.assert_called_once_with(
            method='GET',
            url=expected_url,
            headers=expected_headers,
            data=None)

    def test_api_request_w_non_json_response(self):
        http = make_requests_session([
            make_response(content=b'content')])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        with self.assertRaises(ValueError):
            conn.api_request('GET', '/')

    def test_api_request_wo_json_expected(self):
        http = make_requests_session([
            make_response(content=b'content')])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        result = conn.api_request('GET', '/', expect_json=False)

        self.assertEqual(result, b'content')

    def test_api_request_w_query_params(self):
        from six.moves.urllib.parse import parse_qs
        from six.moves.urllib.parse import urlsplit

        http = make_requests_session([self.EMPTY_JSON_RESPONSE])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        result = conn.api_request('GET', '/', {
            'foo': 'bar',
            'baz': ['qux', 'quux']
        })

        self.assertEqual(result, {})

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'User-Agent': conn.USER_AGENT,
        }
        http.request.assert_called_once_with(
            method='GET', url=mock.ANY, headers=expected_headers,
            data=None)

        url = http.request.call_args[1]['url']
        scheme, netloc, path, qs, _ = urlsplit(url)
        self.assertEqual('%s://%s' % (scheme, netloc), conn.API_BASE_URL)
        # Intended to emulate self.mock_template
        PATH = '/'.join([
            '',
            'mock',
            conn.API_VERSION,
            '',
        ])
        self.assertEqual(path, PATH)
        parms = dict(parse_qs(qs))
        self.assertEqual(parms['foo'], ['bar'])
        self.assertEqual(parms['baz'], ['qux', 'quux'])

    def test_api_request_w_headers(self):
        http = make_requests_session([self.EMPTY_JSON_RESPONSE])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        result = conn.api_request('GET', '/', headers={'X-Foo': 'bar'})
        self.assertEqual(result, {})

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'User-Agent': conn.USER_AGENT,
            'X-Foo': 'bar',
        }
        http.request.assert_called_once_with(
            method='GET', url=mock.ANY, headers=expected_headers,
            data=None)

    def test_api_request_w_extra_headers(self):
        http = make_requests_session([self.EMPTY_JSON_RESPONSE])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)
        conn._EXTRA_HEADERS = {
            'X-Baz': 'dax-quux',
            'X-Foo': 'not-bar',  # Collision with ``headers``.
        }

        result = conn.api_request('GET', '/', headers={'X-Foo': 'bar'})

        self.assertEqual(result, {})

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'User-Agent': conn.USER_AGENT,
            'X-Foo': 'not-bar',  # The one passed-in is overridden.
            'X-Baz': 'dax-quux',
        }
        http.request.assert_called_once_with(
            method='GET', url=mock.ANY, headers=expected_headers,
            data=None)

    def test_api_request_w_data(self):
        http = make_requests_session([self.EMPTY_JSON_RESPONSE])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        data = {'foo': 'bar'}
        self.assertEqual(conn.api_request('POST', '/', data=data), {})

        expected_data = json.dumps(data)

        expected_headers = {
            'Accept-Encoding': 'gzip',
            'Content-Type': 'application/json',
            'User-Agent': conn.USER_AGENT,
        }

        http.request.assert_called_once_with(
            method='POST', url=mock.ANY, headers=expected_headers,
            data=expected_data)

    def test_api_request_w_404(self):
        from google.cloud import exceptions

        http = make_requests_session([make_response(http_client.NOT_FOUND)])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        with self.assertRaises(exceptions.NotFound):
            conn.api_request('GET', '/')

    def test_api_request_w_500(self):
        from google.cloud import exceptions

        http = make_requests_session([
            make_response(http_client.INTERNAL_SERVER_ERROR)])
        client = mock.Mock(_http=http, spec=['_http'])
        conn = self._make_mock_one(client)

        with self.assertRaises(exceptions.InternalServerError):
            conn.api_request('GET', '/')
