#    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 copy
import json

from heatclient import exc
import six
import yaml

from heat_integrationtests.common import test


class ResourceGroupTest(test.HeatIntegrationTest):
    template = '''
heat_template_version: 2013-05-23
resources:
  random_group:
    type: OS::Heat::ResourceGroup
    properties:
      count: 0
      resource_def:
        type: My::RandomString
        properties:
          length: 30
          salt: initial
outputs:
  random1:
    value: {get_attr: [random_group, resource.0.value]}
  random2:
    value: {get_attr: [random_group, resource.1.value]}
  all_values:
    value: {get_attr: [random_group, value]}
'''

    def setUp(self):
        super(ResourceGroupTest, self).setUp()
        self.client = self.orchestration_client

    def _group_nested_identifier(self, stack_identifier,
                                 group_name='random_group'):
        # Get the nested stack identifier from the group
        rsrc = self.client.resources.get(stack_identifier, group_name)
        physical_resource_id = rsrc.physical_resource_id

        nested_stack = self.client.stacks.get(physical_resource_id)
        nested_identifier = '%s/%s' % (nested_stack.stack_name,
                                       nested_stack.id)
        parent_id = stack_identifier.split("/")[-1]
        self.assertEqual(parent_id, nested_stack.parent)
        return nested_identifier

    def test_resource_group_zero_novalidate(self):
        # Nested resources should be validated only when size > 0
        # This allows features to be disabled via size=0 without
        # triggering validation of nested resource custom contraints
        # e.g images etc in the nested schema.
        nested_template_fail = '''
heat_template_version: 2013-05-23
parameters:
  length:
    type: string
    default: 50
  salt:
    type: string
    default: initial
resources:
  random:
    type: OS::Heat::RandomString
    properties:
      length: BAD
'''

        files = {'provider.yaml': nested_template_fail}
        env = {'resource_registry':
               {'My::RandomString': 'provider.yaml'}}
        stack_identifier = self.stack_create(
            template=self.template,
            files=files,
            environment=env
        )

        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))

        # Check we created an empty nested stack
        nested_identifier = self._group_nested_identifier(stack_identifier)
        self.assertEqual({}, self.list_resources(nested_identifier))

        # Prove validation works for non-zero create/update
        template_two_nested = self.template.replace("count: 0", "count: 2")
        expected_err = "Value 'BAD' is not an integer"
        ex = self.assertRaises(exc.HTTPBadRequest, self.update_stack,
                               stack_identifier, template_two_nested,
                               environment=env, files=files)
        self.assertIn(expected_err, six.text_type(ex))

        ex = self.assertRaises(exc.HTTPBadRequest, self.stack_create,
                               template=template_two_nested,
                               environment=env, files=files)
        self.assertIn(expected_err, six.text_type(ex))

    def _validate_resources(self, stack_identifier, expected_count):
        nested_identifier = self._group_nested_identifier(stack_identifier)
        resources = self.list_resources(nested_identifier)
        self.assertEqual(expected_count, len(resources))
        expected_resources = dict(
            (str(idx), 'My::RandomString')
            for idx in range(expected_count))

        self.assertEqual(expected_resources, resources)

    def test_create(self):
        def validate_output(stack, output_key, length):
            output_value = self._stack_output(stack, output_key)
            self.assertEqual(length, len(output_value))
            return output_value
        # verify that the resources in resource group are identically
        # configured, resource names and outputs are appropriate.
        env = {'resource_registry':
               {'My::RandomString': 'OS::Heat::RandomString'}}
        create_template = self.template.replace("count: 0", "count: 2")
        stack_identifier = self.stack_create(template=create_template,
                                             environment=env)
        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))

        # validate count, type and name of resources in a resource group.
        self._validate_resources(stack_identifier, 2)

        # validate outputs
        stack = self.client.stacks.get(stack_identifier)
        outputs = []
        outputs.append(validate_output(stack, 'random1', 30))
        outputs.append(validate_output(stack, 'random2', 30))
        self.assertEqual(outputs, self._stack_output(stack, 'all_values'))

    def test_update_increase_decrease_count(self):
        # create stack with resource group count 2
        env = {'resource_registry':
               {'My::RandomString': 'OS::Heat::RandomString'}}
        create_template = self.template.replace("count: 0", "count: 2")
        stack_identifier = self.stack_create(template=create_template,
                                             environment=env)
        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))
        # verify that the resource group has 2 resources
        self._validate_resources(stack_identifier, 2)

        # increase the resource group count to 5
        update_template = self.template.replace("count: 0", "count: 5")
        self.update_stack(stack_identifier, update_template, environment=env)
        # verify that the resource group has 5 resources
        self._validate_resources(stack_identifier, 5)

        # decrease the resource group count to 3
        update_template = self.template.replace("count: 0", "count: 3")
        self.update_stack(stack_identifier, update_template, environment=env)
        # verify that the resource group has 3 resources
        self._validate_resources(stack_identifier, 3)

    def test_props_update(self):
        """Test update of resource_def properties behaves as expected."""

        env = {'resource_registry':
               {'My::RandomString': 'OS::Heat::RandomString'}}
        template_one = self.template.replace("count: 0", "count: 1")
        stack_identifier = self.stack_create(template=template_one,
                                             environment=env)
        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))

        initial_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual({'0': 'My::RandomString'},
                         self.list_resources(initial_nested_ident))
        # get the resource id
        res = self.client.resources.get(initial_nested_ident, '0')
        initial_res_id = res.physical_resource_id

        # change the salt (this should replace the RandomString but
        # not the nested stack or resource group.
        template_salt = template_one.replace("salt: initial", "salt: more")
        self.update_stack(stack_identifier, template_salt, environment=env)
        updated_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual(initial_nested_ident, updated_nested_ident)

        # compare the resource id, we expect a change.
        res = self.client.resources.get(updated_nested_ident, '0')
        updated_res_id = res.physical_resource_id
        self.assertNotEqual(initial_res_id, updated_res_id)

    def test_update_nochange(self):
        """Test update with no properties change."""

        env = {'resource_registry':
               {'My::RandomString': 'OS::Heat::RandomString'}}
        template_one = self.template.replace("count: 0", "count: 1")
        stack_identifier = self.stack_create(template=template_one,
                                             environment=env)
        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))

        initial_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual({'0': 'My::RandomString'},
                         self.list_resources(initial_nested_ident))
        # get the output
        stack0 = self.client.stacks.get(stack_identifier)
        initial_rand = self._stack_output(stack0, 'random1')

        template_copy = copy.deepcopy(template_one)
        self.update_stack(stack_identifier, template_copy, environment=env)
        updated_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual(initial_nested_ident, updated_nested_ident)

        # compare the random number, we expect no change.
        stack1 = self.client.stacks.get(stack_identifier)
        updated_rand = self._stack_output(stack1, 'random1')
        self.assertEqual(initial_rand, updated_rand)

    def test_update_nochange_resource_needs_update(self):
        """Test update when the resource definition has changed."""
        # Test the scenario when the ResourceGroup update happens without
        # any changed properties, this can happen if the definition of
        # a contained provider resource changes (files map changes), then
        # the group and underlying nested stack should end up updated.

        random_templ1 = '''
heat_template_version: 2013-05-23
parameters:
  length:
    type: string
    default: not-used
  salt:
    type: string
    default: not-used
resources:
  random1:
    type: OS::Heat::RandomString
    properties:
      salt: initial
outputs:
  value:
    value: {get_attr: [random1, value]}
'''
        files1 = {'my_random.yaml': random_templ1}

        random_templ2 = random_templ1.replace('salt: initial',
                                              'salt: more')
        files2 = {'my_random.yaml': random_templ2}

        env = {'resource_registry':
               {'My::RandomString': 'my_random.yaml'}}

        template_one = self.template.replace("count: 0", "count: 1")
        stack_identifier = self.stack_create(template=template_one,
                                             environment=env,
                                             files=files1)
        self.assertEqual({u'random_group': u'OS::Heat::ResourceGroup'},
                         self.list_resources(stack_identifier))

        initial_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual({'0': 'My::RandomString'},
                         self.list_resources(initial_nested_ident))
        # get the output
        stack0 = self.client.stacks.get(stack_identifier)
        initial_rand = self._stack_output(stack0, 'random1')

        # change the environment so we use a different TemplateResource.
        # note "files2".
        self.update_stack(stack_identifier, template_one,
                          environment=env, files=files2)
        updated_nested_ident = self._group_nested_identifier(stack_identifier)
        self.assertEqual(initial_nested_ident, updated_nested_ident)

        # compare the output, we expect a change.
        stack1 = self.client.stacks.get(stack_identifier)
        updated_rand = self._stack_output(stack1, 'random1')
        self.assertNotEqual(initial_rand, updated_rand)


class ResourceGroupTestNullParams(test.HeatIntegrationTest):
    template = '''
heat_template_version: 2013-05-23
parameters:
  param:
    type: empty
resources:
  random_group:
    type: OS::Heat::ResourceGroup
    properties:
      count: 1
      resource_def:
        type: My::RandomString
        properties:
          param: {get_param: param}
outputs:
  val:
    value: {get_attr: [random_group, val]}
'''

    nested_template_file = '''
heat_template_version: 2013-05-23
parameters:
  param:
    type: empty
outputs:
  val:
    value: {get_param: param}
'''

    scenarios = [
        ('string_empty', dict(
            param='',
            p_type='string',
        )),
        ('boolean_false', dict(
            param=False,
            p_type='boolean',
        )),
        ('number_zero', dict(
            param=0,
            p_type='number',
        )),
        ('comma_delimited_list', dict(
            param=[],
            p_type='comma_delimited_list',
        )),
        ('json_empty', dict(
            param={},
            p_type='json',
        )),
    ]

    def setUp(self):
        super(ResourceGroupTestNullParams, self).setUp()
        self.client = self.orchestration_client

    def test_create_pass_zero_parameter(self):
        templ = self.template.replace('type: empty',
                                      'type: %s' % self.p_type)
        n_t_f = self.nested_template_file.replace('type: empty',
                                                  'type: %s' % self.p_type)
        files = {'provider.yaml': n_t_f}
        env = {'resource_registry':
               {'My::RandomString': 'provider.yaml'}}
        stack_identifier = self.stack_create(
            template=templ,
            files=files,
            environment=env,
            parameters={'param': self.param}
        )
        stack = self.client.stacks.get(stack_identifier)
        self.assertEqual(self.param, self._stack_output(stack, 'val')[0])


class ResourceGroupAdoptTest(test.HeatIntegrationTest):
    """Prove that we can do resource group adopt."""

    main_template = '''
heat_template_version: "2013-05-23"
resources:
  group1:
    type: OS::Heat::ResourceGroup
    properties:
      count: 2
      resource_def:
        type: OS::Heat::RandomString
outputs:
  test0:
    value: {get_attr: [group1, resource.0.value]}
  test1:
    value: {get_attr: [group1, resource.1.value]}
'''

    def setUp(self):
        super(ResourceGroupAdoptTest, self).setUp()
        self.client = self.orchestration_client

    def _yaml_to_json(self, yaml_templ):
        return yaml.load(yaml_templ)

    def test_adopt(self):
        data = {
            "resources": {
                "group1": {
                    "status": "COMPLETE",
                    "name": "group1",
                    "resource_data": {},
                    "metadata": {},
                    "resource_id": "test-group1-id",
                    "action": "CREATE",
                    "type": "OS::Heat::ResourceGroup",
                    "resources": {
                        "0": {
                            "status": "COMPLETE",
                            "name": "0",
                            "resource_data": {"value": "goopie"},
                            "resource_id": "ID-0",
                            "action": "CREATE",
                            "type": "OS::Heat::RandomString",
                            "metadata": {}
                        },
                        "1": {
                            "status": "COMPLETE",
                            "name": "1",
                            "resource_data": {"value": "different"},
                            "resource_id": "ID-1",
                            "action": "CREATE",
                            "type": "OS::Heat::RandomString",
                            "metadata": {}
                        }
                    }
                }
            },
            "environment": {"parameters": {}},
            "template": yaml.load(self.main_template)
        }
        stack_identifier = self.stack_adopt(
            adopt_data=json.dumps(data))

        self.assert_resource_is_a_stack(stack_identifier, 'group1')
        stack = self.client.stacks.get(stack_identifier)
        self.assertEqual('goopie', self._stack_output(stack, 'test0'))
        self.assertEqual('different', self._stack_output(stack, 'test1'))