# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#
# Implements parts of RFC 2131, 1541, 1497 and
# http://msdn.microsoft.com/en-us/library/cc227282%28PROT.10%29.aspx
# http://msdn.microsoft.com/en-us/library/cc227259%28PROT.13%29.aspx

"""
Define util functions for unit test
"""

import re
import os
import sys
import unittest
import shutil
import json
import tempfile
from functools import wraps
import azurelinuxagent.conf as conf
import azurelinuxagent.logger as logger
import azurelinuxagent.event as event

#Import mock module for Python2 and Python3
try:
    from unittest.mock import Mock, patch, MagicMock
except ImportError:
    from mock import Mock, patch, MagicMock

test_dir = os.path.dirname(os.path.abspath(__file__))
data_dir = os.path.join(test_dir, "data")

debug = False
if os.environ.get('DEBUG') == '1':
    debug = True

#Enable verbose logger to stdout
if debug:
    logger.add_logger_appender(logger.AppenderType.STDOUT, 
                               logger.LogLevel.VERBOSE)

class AgentTestCase(unittest.TestCase):
    def setUp(self):
        prefix = "{0}_".format(self.__class__.__name__)
        self.tmp_dir = tempfile.mkdtemp(prefix=prefix)
        conf.get_lib_dir = Mock(return_value=self.tmp_dir)
        ext_log_dir = os.path.join(self.tmp_dir, "azure")
        conf.get_ext_log_dir = Mock(return_value=ext_log_dir)

    def tearDown(self):
        if not debug and self.tmp_dir is not None:
            shutil.rmtree(self.tmp_dir)

def load_data(name):
    """Load test data"""
    path = os.path.join(data_dir, name)
    with open(path, "r") as data_file:
        return data_file.read()

def load_bin_data(name):
    """Load test bin data"""
    path = os.path.join(data_dir, name)
    with open(path, "rb") as data_file:
        return data_file.read()


supported_distro = [
    ["ubuntu", "12.04", ""],
    ["ubuntu", "14.04", ""],
    ["ubuntu", "14.10", ""],
    ["ubuntu", "15.10", ""],
    ["ubuntu", "15.10", "Snappy Ubuntu Core"],

    ["coreos", "", ""],

    ["suse", "12", "SUSE Linux Enterprise Server"],
    ["suse", "13.2", "openSUSE"],
    ["suse", "11", "SUSE Linux Enterprise Server"],
    ["suse", "13.1", "openSUSE"],

    ["debian", "6.0", ""],

    ["redhat", "6.5", ""],
    ["redhat", "7.0", ""],

]

def distros(distro_name=".*", distro_version=".*", distro_full_name=".*"):
    """Run test on multiple distros"""
    def decorator(test_method):
        @wraps(test_method)
        def wrapper(self, *args, **kwargs):
            for distro in supported_distro:
                if re.match(distro_name, distro[0]) and \
                   re.match(distro_version, distro[1]) and \
                   re.match(distro_full_name, distro[2]):
                    if debug:
                        logger.info("Run {0} on {1}", test_method.__name__, 
                                    distro)
                    new_args = []
                    new_args.extend(args)
                    new_args.extend(distro)
                    test_method(self, *new_args, **kwargs)
                    #Call tearDown and setUp to create seprated environment for 
                    #distro testing
                    self.tearDown()
                    self.setUp()
        return wrapper
    return decorator