# -*- coding: utf-8 -*-

#    Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
#
#    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 contextlib
import time

from taskflow import task
from taskflow import test

import taskflow.engines
from taskflow.listeners import timing
from taskflow.patterns import linear_flow as lf
from taskflow.persistence.backends import impl_memory
from taskflow.utils import persistence_utils as p_utils


class SleepyTask(task.Task):
    def __init__(self, name, sleep_for=0.0):
        super(SleepyTask, self).__init__(name=name)
        self._sleep_for = float(sleep_for)

    def execute(self):
        if self._sleep_for <= 0:
            return
        else:
            time.sleep(self._sleep_for)


class TestDuration(test.TestCase):
    def make_engine(self, flow, flow_detail, backend):
        e = taskflow.engines.load(flow,
                                  flow_detail=flow_detail,
                                  backend=backend)
        e.compile()
        return e

    def test_duration(self):
        with contextlib.closing(impl_memory.MemoryBackend({})) as be:
            flo = lf.Flow("test")
            flo.add(SleepyTask("test-1", sleep_for=0.1))
            (lb, fd) = p_utils.temporary_flow_detail(be)
            e = self.make_engine(flo, fd, be)
            with timing.TimingListener(e):
                e.run()
            t_uuid = e.storage.get_task_uuid("test-1")
            td = fd.find(t_uuid)
            self.assertIsNotNone(td)
            self.assertIsNotNone(td.meta)
            self.assertIn('duration', td.meta)
            self.assertGreaterEqual(0.1, td.meta['duration'])