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

# Copyright (C) 2013-2018  Red Hat, Inc.

#

# This copyrighted material is made available to anyone wishing to use,

# modify, copy, or redistribute it subject to the terms and conditions of

# the GNU General Public License v.2, or (at your option) any later version.

# This program is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY expressed or implied, including the implied warranties of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

# Public License for more details.  You should have received a copy of the

# GNU General Public License along with this program; if not, write to the

# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the

# source code or documentation are not subject to the GNU General Public

# License and may only be used or replicated with the express permission of

# Red Hat, Inc.

#

from __future__ import absolute_import

from __future__ import unicode_literals

import logging

import collections

import operator

import os

import tempfile

import dnf.const

import dnf.logging

import tests.support

from tests.support import mock

LogfileEntry = collections.namedtuple('LogfileEntry', ('date', 'time', 'message'))

def _split_logfile_entry(entry):

    record = entry.split(' ')

    datetime = record[0].split('T')

    # strip the trailing '\n' from the message:

    message = ' '.join(record[2:])[:-1]

    return LogfileEntry(date=datetime[0],

                        time=datetime[1], message=message)

def drop_all_handlers():

    for logger_name in ('dnf', 'dnf.rpm'):

        logger = logging.getLogger(logger_name)

        for handler in logger.handlers[:]:

            logger.removeHandler(handler)

class TestLogging(tests.support.TestCase):

    """Tests the logging mechanisms in DNF.

    If it causes a problem in the future that loggers are singletons that don't

    get torn down between tests, look at logging.Manager internals.

    """

    def setUp(self):

        self.logdir = tempfile.mkdtemp(prefix="dnf-logtest-")

        self.log_size = 1024 * 1024

        self.log_rotate = 4

        self.logging = dnf.logging.Logging()

    def tearDown(self):

        drop_all_handlers()

        dnf.util.rm_rf(self.logdir)

    @staticmethod

    def _bench(logger):

        logger.debug(u"d")

        logger.info(u"i")

        logger.warning(u"w")

        logger.error(u"e")

    def test_level_conversion(self):

        self.assertRaises(AssertionError, dnf.logging._cfg_verbose_val2level, 11)

        self.assertEqual(dnf.logging._cfg_verbose_val2level(0),

                         dnf.logging.SUPERCRITICAL)

        self.assertEqual(dnf.logging._cfg_verbose_val2level(7),

                         dnf.logging.DDEBUG)

    def test_setup(self):

        logger = logging.getLogger("dnf")

        with tests.support.patch_std_streams() as (stdout, stderr):

            self.logging._setup(

                logging.INFO, logging.ERROR, dnf.logging.TRACE, self.logdir, self.log_size, self.log_rotate)

            self._bench(logger)

        self.assertEqual("i\n", stdout.getvalue())

        self.assertEqual("e\n", stderr.getvalue())

    def test_setup_verbose(self):

        logger = logging.getLogger("dnf")

        with tests.support.patch_std_streams() as (stdout, stderr):

            self.logging._setup(

                logging.DEBUG, logging.WARNING, dnf.logging.TRACE, self.logdir, self.log_size, self.log_rotate)

            self._bench(logger)

        self.assertEqual("d\ni\n", stdout.getvalue())

        self.assertEqual("w\ne\n", stderr.getvalue())

    @mock.patch('dnf.logging.Logging._setup')

    def test_setup_from_dnf_conf(self, setup_m):

        conf = mock.Mock(

            debuglevel=2, errorlevel=3, logfilelevel=2, logdir=self.logdir,

            log_size=self.log_size, log_rotate=self.log_rotate)

        self.logging._setup_from_dnf_conf(conf)

        self.assertEqual(setup_m.call_args, mock.call(dnf.logging.INFO,

                                                      dnf.logging.WARNING,

                                                      dnf.logging.INFO,

                                                      self.logdir,

                                                      self.log_size,

                                                      self.log_rotate))

        conf = mock.Mock(

            debuglevel=6, errorlevel=6, logfilelevel=6, logdir=self.logdir,

            log_size=self.log_size, log_rotate=self.log_rotate)

        self.logging._setup_from_dnf_conf(conf)

        self.assertEqual(setup_m.call_args, mock.call(dnf.logging.DEBUG,

                                                      dnf.logging.WARNING,

                                                      dnf.logging.DEBUG,

                                                      self.logdir,

                                                      self.log_size,

                                                      self.log_rotate))

    def test_file_logging(self):

        # log nothing to the console:

        self.logging._setup(

            dnf.logging.SUPERCRITICAL, dnf.logging.SUPERCRITICAL, dnf.logging.TRACE,

            self.logdir, self.log_size, self.log_rotate)

        logger = logging.getLogger("dnf")

        with tests.support.patch_std_streams() as (stdout, stderr):

            logger.info("i")

            logger.critical("c")

        self.assertEqual(stdout.getvalue(), '')

        self.assertEqual(stderr.getvalue(), '')

        # yet the file should contain both the entries:

        logfile = os.path.join(self.logdir, "dnf.log")

        self.assertFile(logfile)

        with open(logfile) as f:

            msgs = map(operator.attrgetter("message"),

                       map(_split_logfile_entry, f.readlines()))

        self.assertSequenceEqual(list(msgs), [dnf.const.LOG_MARKER, 'i', 'c'])

    def test_rpm_logging(self):

        # log everything to the console:

        self.logging._setup(

            dnf.logging.SUBDEBUG, dnf.logging.SUBDEBUG, dnf.logging.TRACE,

            self.logdir, self.log_size, self.log_rotate)

        logger = logging.getLogger("dnf.rpm")

        with tests.support.patch_std_streams() as (stdout, stderr):

            logger.info('rpm transaction happens.')

        # rpm logger never outputs to the console:

        self.assertEqual(stdout.getvalue(), "")

        self.assertEqual(stderr.getvalue(), "")

        logfile = os.path.join(self.logdir, "dnf.rpm.log")

        self.assertFile(logfile)

        with open(logfile) as f:

            msgs = map(operator.attrgetter("message"),

                       map(_split_logfile_entry, f.readlines()))

        self.assertSequenceEqual(

            list(msgs),

            [dnf.const.LOG_MARKER, 'rpm transaction happens.']

        )

    def test_setup_only_once(self):

        logger = logging.getLogger("dnf")

        self.assertLength(logger.handlers, 0)

        self.logging._setup(

            dnf.logging.SUBDEBUG, dnf.logging.SUBDEBUG, dnf.logging.TRACE,

            self.logdir, self.log_size, self.log_rotate)

        cnt = len(logger.handlers)

        self.assertGreater(cnt, 0)

        self.logging._setup(

            dnf.logging.SUBDEBUG, dnf.logging.SUBDEBUG,

            self.logdir, self.log_size, self.log_rotate)

        # no new handlers

        self.assertEqual(cnt, len(logger.handlers))