import unittest
import pytest
from typing import Optional
from unittest.mock import patch

from databricks.sql.auth.auth import AccessTokenAuthProvider, BasicAuthProvider, AuthProvider, ExternalAuthProvider
from databricks.sql.auth.auth import get_python_sql_connector_auth_provider
from databricks.sql.auth.oauth import OAuthManager
from databricks.sql.auth.authenticators import DatabricksOAuthProvider
from databricks.sql.auth.endpoint import CloudType, AwsOAuthEndpointCollection, AzureOAuthEndpointCollection
from databricks.sql.auth.authenticators import CredentialsProvider, HeaderFactory
from databricks.sql.experimental.oauth_persistence import OAuthPersistenceCache


class Auth(unittest.TestCase):

    def test_access_token_provider(self):
        access_token = "aBc2"
        auth = AccessTokenAuthProvider(access_token=access_token)

        http_request = {'myKey': 'myVal'}
        auth.add_headers(http_request)
        self.assertEqual(http_request['Authorization'], 'Bearer aBc2')
        self.assertEqual(len(http_request.keys()), 2)
        self.assertEqual(http_request['myKey'], 'myVal')

    def test_basic_auth_provider(self):
        username = "moderakh"
        password = "Elevate Databricks 123!!!"
        auth = BasicAuthProvider(username=username, password=password)

        http_request = {'myKey': 'myVal'}
        auth.add_headers(http_request)

        self.assertEqual(http_request['Authorization'], 'Basic bW9kZXJha2g6RWxldmF0ZSBEYXRhYnJpY2tzIDEyMyEhIQ==')
        self.assertEqual(len(http_request.keys()), 2)
        self.assertEqual(http_request['myKey'], 'myVal')

    def test_noop_auth_provider(self):
        auth = AuthProvider()

        http_request = {'myKey': 'myVal'}
        auth.add_headers(http_request)

        self.assertEqual(len(http_request.keys()), 1)
        self.assertEqual(http_request['myKey'], 'myVal')

    @patch.object(OAuthManager, "check_and_refresh_access_token")
    @patch.object(OAuthManager, "get_tokens")
    def test_oauth_auth_provider(self, mock_get_tokens, mock_check_and_refresh):
        client_id = "mock-id"
        scopes = ["offline_access", "sql"]
        access_token = "mock_token"
        refresh_token = "mock_refresh_token"
        mock_get_tokens.return_value = (access_token, refresh_token)
        mock_check_and_refresh.return_value = (access_token, refresh_token, False)

        params = [(CloudType.AWS, "foo.cloud.databricks.com", AwsOAuthEndpointCollection, "offline_access sql"),
                  (CloudType.AZURE, "foo.1.azuredatabricks.net", AzureOAuthEndpointCollection,
                   f"{AzureOAuthEndpointCollection.DATATRICKS_AZURE_APP}/user_impersonation offline_access")]

        for cloud_type, host, expected_endpoint_type, expected_scopes in params:
            with self.subTest(cloud_type.value):
                oauth_persistence = OAuthPersistenceCache()
                auth_provider = DatabricksOAuthProvider(hostname=host,
                                                        oauth_persistence=oauth_persistence,
                                                        redirect_port_range=[8020],
                                                        client_id=client_id,
                                                        scopes=scopes)

                self.assertIsInstance(auth_provider.oauth_manager.idp_endpoint, expected_endpoint_type)
                self.assertEqual(auth_provider.oauth_manager.port_range, [8020])
                self.assertEqual(auth_provider.oauth_manager.client_id, client_id)
                self.assertEqual(oauth_persistence.read(host).refresh_token, refresh_token)
                mock_get_tokens.assert_called_with(hostname=host, scope=expected_scopes)

                headers = {}
                auth_provider.add_headers(headers)
                self.assertEqual(headers['Authorization'], f"Bearer {access_token}")

    def test_external_provider(self):
        class MyProvider(CredentialsProvider):
                def auth_type(self) -> str:
                    return "mine"

                def __call__(self, *args, **kwargs) -> HeaderFactory:
                    return lambda: {"foo": "bar"}

        auth = ExternalAuthProvider(MyProvider())

        http_request = {'myKey': 'myVal'}
        auth.add_headers(http_request)
        self.assertEqual(http_request['foo'], 'bar')
        self.assertEqual(len(http_request.keys()), 2)
        self.assertEqual(http_request['myKey'], 'myVal')

    def test_get_python_sql_connector_auth_provider_access_token(self):
        hostname = "moderakh-test.cloud.databricks.com"
        kwargs = {'access_token': 'dpi123'}
        auth_provider = get_python_sql_connector_auth_provider(hostname, **kwargs)
        self.assertTrue(type(auth_provider).__name__, "AccessTokenAuthProvider")

        headers = {}
        auth_provider.add_headers(headers)
        self.assertEqual(headers['Authorization'], 'Bearer dpi123')

    def test_get_python_sql_connector_auth_provider_external(self):

        class MyProvider(CredentialsProvider):
                def auth_type(self) -> str:
                    return "mine"

                def __call__(self, *args, **kwargs) -> HeaderFactory:
                    return lambda: {"foo": "bar"}

        hostname = "moderakh-test.cloud.databricks.com"
        kwargs = {'credentials_provider': MyProvider()}
        auth_provider = get_python_sql_connector_auth_provider(hostname, **kwargs)
        self.assertTrue(type(auth_provider).__name__, "ExternalAuthProvider")

        headers = {}
        auth_provider.add_headers(headers)
        self.assertEqual(headers['foo'], 'bar')

    def test_get_python_sql_connector_auth_provider_username_password(self):
        username = "moderakh"
        password = "Elevate Databricks 123!!!"
        hostname = "moderakh-test.cloud.databricks.com"
        kwargs = {'_username': username, '_password': password}
        auth_provider = get_python_sql_connector_auth_provider(hostname, **kwargs)
        self.assertTrue(type(auth_provider).__name__, "BasicAuthProvider")

        headers = {}
        auth_provider.add_headers(headers)
        self.assertEqual(headers['Authorization'], 'Basic bW9kZXJha2g6RWxldmF0ZSBEYXRhYnJpY2tzIDEyMyEhIQ==')

    def test_get_python_sql_connector_auth_provider_noop(self):
        tls_client_cert_file = "fake.cert"
        use_cert_as_auth = "abc"
        hostname = "moderakh-test.cloud.databricks.com"
        kwargs = {'_tls_client_cert_file': tls_client_cert_file, '_use_cert_as_auth': use_cert_as_auth}
        auth_provider = get_python_sql_connector_auth_provider(hostname, **kwargs)
        self.assertTrue(type(auth_provider).__name__, "CredentialProvider")