# Copyright 2015 - Mirantis, 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.

from oslo_config import cfg

from mistral.db.v2 import api as db_api
from mistral.services import workflows as wf_service
from mistral.tests.unit.engine import base
from mistral.workflow import data_flow
from mistral.workflow import states
from mistral_lib import actions as actions_base

# Use the set_default method to set value otherwise in certain test cases
# the change in value is not permanent.
cfg.CONF.set_default('auth_enable', False, group='pecan')


WF = """
---
version: '2.0'

wf:
  input:
    - success_result
    - error_result

  tasks:
    task1:
      action: {action_name}
      input:
        success_result: <% $.success_result %>
        error_result: <% $.error_result %>
      publish:
        p_var: <% task(task1).result %>
      on-error:
        - task2: <% task(task1).result = 2 %>
        - task3: <% task(task1).result = 3 %>

    task2:
      action: std.noop

    task3:
      action: std.noop
"""


class MyAction(actions_base.Action):
    def __init__(self, success_result, error_result):
        self.success_result = success_result
        self.error_result = error_result

    def run(self, context):
        return actions_base.Result(
            data=self.success_result,
            error=self.error_result
        )

    def test(self):
        raise NotImplementedError


class MyAsyncAction(MyAction):

    def is_sync(self):
        return False


class ErrorResultTest(base.EngineTestCase):
    def setUp(self):
        super(ErrorResultTest, self).setUp()

        self.register_action_class('my_action', MyAction)
        self.register_action_class('my_async_action', MyAsyncAction)

    def test_error_result1(self):
        wf_service.create_workflows(WF.format(action_name="my_action"))

        # Start workflow.
        wf_ex = self.engine.start_workflow(
            'wf',
            wf_input={
                'success_result': None,
                'error_result': 2
            }
        )

        self.await_workflow_success(wf_ex.id)

        with db_api.transaction():
            # Note: We need to reread execution to access related tasks.
            wf_ex = db_api.get_workflow_execution(wf_ex.id)

            tasks = wf_ex.task_executions

            self.assertEqual(2, len(tasks))

            task1 = self._assert_single_item(tasks, name='task1')
            task2 = self._assert_single_item(tasks, name='task2')

            self.assertEqual(states.ERROR, task1.state)
            self.assertEqual(states.SUCCESS, task2.state)

            # "publish" clause is ignored in case of ERROR so task execution
            # field must be empty.
            self.assertDictEqual({}, task1.published)
            self.assertEqual(2, data_flow.get_task_execution_result(task1))

    def test_error_result2(self):
        wf_service.create_workflows(WF.format(action_name="my_action"))

        # Start workflow.
        wf_ex = self.engine.start_workflow(
            'wf',
            wf_input={
                'success_result': None,
                'error_result': 3
            }
        )

        self.await_workflow_success(wf_ex.id)

        with db_api.transaction():
            # Note: We need to reread execution to access related tasks.
            wf_ex = db_api.get_workflow_execution(wf_ex.id)

            tasks = wf_ex.task_executions

            self.assertEqual(2, len(tasks))

            task1 = self._assert_single_item(tasks, name='task1')
            task3 = self._assert_single_item(tasks, name='task3')

            self.assertEqual(states.ERROR, task1.state)
            self.assertEqual(states.SUCCESS, task3.state)

            # "publish" clause is ignored in case of ERROR so task execution
            # field must be empty.
            self.assertDictEqual({}, task1.published)
            self.assertEqual(3, data_flow.get_task_execution_result(task1))

    def test_success_result(self):
        wf_service.create_workflows(WF.format(action_name="my_action"))

        # Start workflow.
        wf_ex = self.engine.start_workflow(
            'wf',
            wf_input={
                'success_result': 'success',
                'error_result': None
            }
        )

        self.await_workflow_success(wf_ex.id)

        with db_api.transaction():
            # Note: We need to reread execution to access related tasks.
            wf_ex = db_api.get_workflow_execution(wf_ex.id)

            tasks = wf_ex.task_executions

            self.assertEqual(1, len(tasks))

            task1 = self._assert_single_item(tasks, name='task1')

            self.assertEqual(states.SUCCESS, task1.state)

            # "publish" clause is ignored in case of ERROR so task execution
            # field must be empty.
            self.assertDictEqual({'p_var': 'success'}, task1.published)
            self.assertEqual(
                'success',
                data_flow.get_task_execution_result(task1)
            )

    def test_async_error_result(self):
        wf_service.create_workflows(WF.format(action_name="my_async_action"))

        # Start workflow.
        wf_ex = self.engine.start_workflow(
            'wf',
            wf_input={
                'success_result': None,
                'error_result': 2
            }
        )

        # If the action errors, we expect the workflow to continue. The
        # on-error means the workflow ends in success.
        self.await_workflow_success(wf_ex.id)

    def test_async_success_result(self):
        wf_service.create_workflows(WF.format(action_name="my_async_action"))

        # Start workflow.
        wf_ex = self.engine.start_workflow(
            'wf',
            wf_input={
                'success_result': 'success',
                'error_result': None
            }
        )

        # When the action is successful, the workflow will wait in the RUNNING
        # state for it to complete.
        self.await_workflow_running(wf_ex.id)

        with db_api.transaction():
            # Note: We need to reread execution to access related tasks.
            wf_ex = db_api.get_workflow_execution(wf_ex.id)

            tasks = wf_ex.task_executions
            self.assertEqual(1, len(tasks))

            task1 = self._assert_single_item(tasks, name='task1')
            self.assertEqual(states.IDLE, task1.state)
