# Copyright 2010-2011 OpenStack Foundation
# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
#
# 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 io import StringIO
import logging
import os
import pprint
import sys

import fixtures
from oslotest import base
import testtools.content

from openstack import utils

_TRUE_VALUES = ('true', '1', 'yes')


class TestCase(base.BaseTestCase):

    """Test case base class for all tests."""

    # A way to adjust slow test classes
    TIMEOUT_SCALING_FACTOR = 1.0

    def setUp(self):
        """Run before each test method to initialize test environment."""
        # No openstacksdk unit tests should EVER run longer than a second.
        # Set this to 5 by default just to give us some fudge.
        # Do this before super setUp so that we intercept the default value
        # in oslotest. TODO(mordred) Make the default timeout configurable
        # in oslotest.
        test_timeout = int(os.environ.get('OS_TEST_TIMEOUT', '5'))
        try:
            test_timeout = int(test_timeout * self.TIMEOUT_SCALING_FACTOR)
            self.useFixture(
                fixtures.EnvironmentVariable(
                    'OS_TEST_TIMEOUT', str(test_timeout)))
        except ValueError:
            # Let oslotest do its thing
            pass

        super(TestCase, self).setUp()

        if os.environ.get('OS_LOG_CAPTURE') in _TRUE_VALUES:
            self._log_stream = StringIO()
            if os.environ.get('OS_ALWAYS_LOG') in _TRUE_VALUES:
                self.addCleanup(self.printLogs)
            else:
                self.addOnException(self.attachLogs)
        else:
            self._log_stream = sys.stdout

        handler = logging.StreamHandler(self._log_stream)
        formatter = logging.Formatter('%(asctime)s %(name)-32s %(message)s')
        handler.setFormatter(formatter)

        logger = logging.getLogger('openstack')
        logger.setLevel(logging.DEBUG)
        logger.addHandler(handler)

        # Enable HTTP level tracing
        # TODO(mordred) This is blowing out our memory we think
        logger = logging.getLogger('keystoneauth')
        logger.setLevel(logging.INFO)
        logger.addHandler(handler)
        logger.propagate = False

    def _fake_logs(self):
        # Override _fake_logs in oslotest until we can get our
        # attach-on-exception logic added
        pass

    def assertEqual(self, first, second, *args, **kwargs):
        '''Munch aware wrapper'''
        if isinstance(first, utils.Munch):
            first = first.toDict()
        if isinstance(second, utils.Munch):
            second = second.toDict()
        return super(TestCase, self).assertEqual(
            first, second, *args, **kwargs)

    def printLogs(self, *args):
        self._log_stream.seek(0)
        print(self._log_stream.read())

    def attachLogs(self, *args):
        def reader():
            self._log_stream.seek(0)
            while True:
                x = self._log_stream.read(4096)
                if not x:
                    break
                yield x.encode('utf8')
        content = testtools.content.content_from_reader(
            reader,
            testtools.content_type.UTF8_TEXT,
            False)
        self.addDetail('logging', content)

    def add_info_on_exception(self, name, text):
        def add_content(unused):
            self.addDetail(name, testtools.content.text_content(
                pprint.pformat(text)))
        self.addOnException(add_content)

    def assertSubdict(self, part, whole):
        missing_keys = []
        for key in part:
            # In the resource we have virtual access by not existing keys. To
            # verify those are there try access it.
            if not whole[key] and part[key]:
                missing_keys.append(key)
        if missing_keys:
            self.fail("Keys %s are in %s but not in %s" %
                      (missing_keys, part, whole))
        wrong_values = [(key, part[key], whole[key])
                        for key in part if part[key] != whole[key]]
        if wrong_values:
            self.fail("Mismatched values: %s" %
                      ", ".join("for %s got %s and %s" % tpl
                                for tpl in wrong_values))
