# Copyright 2017-present Open Networking Foundation
#
# 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.

from __future__ import absolute_import
from . import helpers  # noqa: F401
import unittest

try:  # python 3
    from unittest.mock import patch, MagicMock
except ImportError:  # python 2
    from mock import patch, MagicMock

from grpc_client.models_accessor import GRPCModelsAccessor
from grpc_client.resources import RESOURCES
from grpc_client.KEYS import TOSCA_KEYS


class FakeObj:
    new = None
    filter = None


class FakeResource:
    objects = FakeObj


class FakeModel:
    pass


class FakeExistingModel:
    pass


mock_resources = {
    "username~pass": {
        "test-model": FakeResource,
        "single-key": FakeResource,
        "double-key": FakeResource,
        "one-of-key": FakeResource,
    }
}

mock_keys = {
    "i-do-not-exists": ["name"],
    "test-model": ["name"],
    "empty-key": [],
    "single-key": ["fake_key"],
    "double-key": ["key_1", "key_2"],
    "one-of-key": ["key_1", ["key_2", "key_3"]],
}

USERNAME = "username"
PASSWORD = "pass"


class GRPCModelsAccessor_Create_or_update_Test(unittest.TestCase):
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_unkown_user(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: If a user does not have orm classes, raise
        """
        data = {"name": "test"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "i-do-not-exists", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] User 'username' does not have ready resources",
        )

    @patch.dict(RESOURCES, mock_resources, clear=True)
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_unkown_module(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: If a model is not know by the grpc api, raise
        """
        data = {"name": "test"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "i-do-not-exists", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] The model you are trying to create "
            "(class: i-do-not-exists, properties, {'name': 'test'}) is not know by xos-core",
        )

    def test_unkown_tosca_key(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: If a model does not have a tosca_key, raise
        """
        data = {"name": "test"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "no-key", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] Model no-key doesn't have a tosca_key specified",
        )

    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_empty_tosca_key(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: If a model does not have a tosca_key, raise
        """
        data = {"name": "test"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "empty-key", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] Model empty-key doesn't have a tosca_key specified",
        )

    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_tosca_key_are_defined(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: a model should have a property for it's tosca_key
        """
        data = {"name": "test"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "single-key", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] Model single-key doesn't have a property for the specified tosca_key ('fake_key')",
        )

    @patch.object(FakeResource.objects, "filter")
    @patch.object(FakeResource.objects, "new", MagicMock(return_value=FakeModel))
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_composite_key(self, mock_filter):
        """
        [GRPCModelsAccessor] get_model_from_classname: should use a composite key to lookup a model
        """
        data = {"name": "test", "key_1": "key1", "key_2": "key2"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            model = GRPCModelsAccessor.get_model_from_classname(
                "double-key", data, USERNAME, PASSWORD
            )
            mock_filter.assert_called_with(key_1="key1", key_2="key2")
            self.assertEqual(model, FakeModel)

    @patch.object(FakeResource.objects, "filter")
    @patch.object(FakeResource.objects, "new", MagicMock(return_value=FakeModel))
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_one_of_key(self, mock_filter):
        """
        [GRPCModelsAccessor] get_model_from_classname: should use a composite with one_of key to lookup a model
        """
        # NOTE it should be valid for items with either one of the keys
        data2 = {"name": "test", "key_1": "key1", "key_2": "key2"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            model = GRPCModelsAccessor.get_model_from_classname(
                "one-of-key", data2, USERNAME, PASSWORD
            )
            mock_filter.assert_called_with(key_1="key1", key_2="key2")
            self.assertEqual(model, FakeModel)

        data3 = {"name": "test", "key_1": "key1", "key_3": "key3"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            model = GRPCModelsAccessor.get_model_from_classname(
                "one-of-key", data3, USERNAME, PASSWORD
            )
            mock_filter.assert_called_with(key_1="key1", key_3="key3")
            self.assertEqual(model, FakeModel)

    @patch.object(FakeResource.objects, "filter")
    @patch.object(FakeResource.objects, "new", MagicMock(return_value=FakeModel))
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_one_of_key_error(self, mock_filter):
        data = {"name": "test", "key_1": "key1"}
        with self.assertRaises(Exception) as e:
            GRPCModelsAccessor.get_model_from_classname(
                "one-of-key", data, USERNAME, PASSWORD
            )
        self.assertEqual(
            str(e.exception),
            "[XOS-TOSCA] Model one-of-key doesn't have a property "
            "for the specified tosca_key_one_of (['key_2', 'key_3'])",
        )

    @patch.object(FakeResource.objects, "filter")
    @patch.object(FakeResource.objects, "new", MagicMock(return_value=FakeModel))
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_new_model(self, mock_filter):
        """
        [GRPCModelsAccessor] get_model_from_classname: should create a new model
        """
        data = {"name": "test", "fake_key": "key"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            model = GRPCModelsAccessor.get_model_from_classname(
                "single-key", data, USERNAME, PASSWORD
            )
            mock_filter.assert_called_with(fake_key="key")
            self.assertEqual(model, FakeModel)

    @patch.object(
        FakeResource.objects, "filter", MagicMock(return_value=[FakeExistingModel])
    )
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_existing_model(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: should update an existing model
        """
        data = {"name": "test", "fake_key": "key"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            model = GRPCModelsAccessor.get_model_from_classname(
                "single-key", data, USERNAME, PASSWORD
            )
            self.assertEqual(model, FakeExistingModel)

    @patch.object(FakeResource.objects, "filter", MagicMock(return_value=["a", "b"]))
    @patch.dict(TOSCA_KEYS, mock_keys, clear=True)
    def test_multiple_models(self):
        """
        [GRPCModelsAccessor] get_model_from_classname: should raise an exception if multiple instances are found
        """
        data = {"name": "test"}
        with patch.dict(RESOURCES, mock_resources, clear=True):
            with self.assertRaises(Exception) as e:
                GRPCModelsAccessor.get_model_from_classname(
                    "test-model", data, USERNAME, PASSWORD
                )
            self.assertEqual(
                str(e.exception),
                "[XOS-TOSCA] Model of class test-model and properties "
                "{'name': 'test'} has multiple instances, I can't handle it",
            )


if __name__ == "__main__":
    unittest.main()