#!/usr/bin/python
#
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#!/usr/bin/python
#
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import datetime, unittest

import mox

import common
# This must come before the import of complete_failures in order to use the
# in memory database.
from autotest_lib.frontend import setup_django_readonly_environment
from autotest_lib.frontend import setup_test_environment
import complete_failures
from autotest_lib.client.common_lib import mail
from autotest_lib.frontend.tko import models
from django import test


GOOD_STATUS_IDX = 6
FAIL_STATUS_IDX = 4

ERROR_STATUS = models.Status(status_idx=2, word='ERROR')
ABORT_STATUS = models.Status(status_idx=3, word='ABORT')
FAIL_STATUS = models.Status(status_idx=4, word='FAIL')
WARN_STATUS = models.Status(status_idx=5, word='WARN')
GOOD_STATUS = models.Status(status_idx=6, word='GOOD')
ALERT_STATUS = models.Status(status_idx=7, word='ALERT')


def add_statuses():
    """
    Save the statuses to the in-memory database.

    These normally exist in the database and the code expects them. However, the
    normal test database setup does not do this for us.
    """
    ERROR_STATUS.save()
    ABORT_STATUS.save()
    FAIL_STATUS.save()
    WARN_STATUS.save()
    GOOD_STATUS.save()
    ALERT_STATUS.save()


# During the tests there is a point where Django does a type check on
# datetime.datetime. Unfortunately this means when datetime is mocked out,
# horrible failures happen when Django tries to do this check. The solution
# chosen is to create a pure Python class that inheirits from datetime.datetime
# so that the today class method can be directly mocked out. It is necesarry
# to mock out datetime.datetime completely as it a C class and so cannot have
# parts of itself mocked out.
class MockDatetime(datetime.datetime):
    """Used to mock out parts of datetime.datetime."""
    pass


class CompleteFailuresFunctionalTests(mox.MoxTestBase, test.TestCase):
    """
    Does a functional test of the complete_failures script.

    This uses an in-memory database but everything else is a full run.

    """

    def setUp(self):
        super(CompleteFailuresFunctionalTests, self).setUp()
        setup_test_environment.set_up()
        add_statuses()
        # All of our tests will involve mocking out the datetime.today() class
        # method.
        self.mox.StubOutWithMock(MockDatetime, 'today')
        self.datetime = datetime.datetime
        datetime.datetime = MockDatetime
        # We need to mock out the send function in all tests or else the
        # emails will be sent out during tests.
        self.mox.StubOutWithMock(mail, 'send')

        self._orignal_too_late = complete_failures._DAYS_TO_BE_FAILING_TOO_LONG


    def tearDown(self):
        complete_failures._DAYS_TO_BE_FAILING_TOO_LONG = self._orignal_too_late
        datetime.datetime = self.datetime
        setup_test_environment.tear_down()
        super(CompleteFailuresFunctionalTests, self).tearDown()


    def test(self):
        """Does a basic test of as much of the system as possible."""
        job = models.Job(job_idx=1)
        kernel = models.Kernel(kernel_idx=1)
        machine = models.Machine(machine_idx=1)
        success_status = models.Status(status_idx=GOOD_STATUS_IDX)
        fail_status = models.Status(status_idx=FAIL_STATUS_IDX)

        old_passing_test = models.Test(job=job, status=success_status,
                                       kernel=kernel, machine=machine,
                                       test='test1',
                                       started_time=self.datetime(2012, 1, 1))
        old_passing_test.save()
        failing_test = models.Test(job=job, status=fail_status,
                                   kernel=kernel, machine=machine,
                                   test='test2',
                                   started_time=self.datetime(2012,1,1))
        failing_test.save()
        good_test = models.Test(job=job, status=success_status,
                                kernel=kernel, machine=machine,
                                test='test3',
                                started_time=self.datetime(2012, 1, 20))
        good_test.save()

        complete_failures._DAYS_TO_BE_FAILING_TOO_LONG = 10
        MockDatetime.today().AndReturn(self.datetime(2012, 1, 21))
        MockDatetime.today().AndReturn(self.datetime(2012, 1, 21))
        mail.send('chromeos-test-health@google.com',
                  ['chromeos-lab-infrastructure@google.com'],
                  [],
                  'Long Failing Tests',
                  '2/3 tests have been failing for at least %d days.\n'
                  'They are the following:\n\ntest1\ntest2'
                  % complete_failures._DAYS_TO_BE_FAILING_TOO_LONG)

        self.mox.ReplayAll()
        complete_failures.main()


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