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# Copyright 2013: Mirantis 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.

# yardstick comment: this is a modified copy of rally/rally/common/utils.py

import os
import sys
import yaml
import errno
import subprocess
import logging

from oslo_utils import importutils
from keystoneauth1 import identity
from keystoneauth1 import session
from neutronclient.v2_0 import client

import yardstick

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)


# Decorator for cli-args
def cliargs(*args, **kwargs):
    def _decorator(func):
        func.__dict__.setdefault('arguments', []).insert(0, (args, kwargs))
        return func
    return _decorator


def itersubclasses(cls, _seen=None):
    """Generator over all subclasses of a given class in depth first order."""

    if not isinstance(cls, type):
        raise TypeError("itersubclasses must be called with "
                        "new-style classes, not %.100r" % cls)
    _seen = _seen or set()
    try:
        subs = cls.__subclasses__()
    except TypeError:   # fails only when cls is type
        subs = cls.__subclasses__(cls)
    for sub in subs:
        if sub not in _seen:
            _seen.add(sub)
            yield sub
            for sub in itersubclasses(sub, _seen):
                yield sub


def try_append_module(name, modules):
    if name not in modules:
        modules[name] = importutils.import_module(name)


def import_modules_from_package(package):
    """Import modules from package and append into sys.modules

    :param: package - Full package name. For example: rally.deploy.engines
    """
    path = [os.path.dirname(yardstick.__file__), ".."] + package.split(".")
    path = os.path.join(*path)
    for root, dirs, files in os.walk(path):
        for filename in files:
            if filename.startswith("__") or not filename.endswith(".py"):
                continue
            new_package = ".".join(root.split(os.sep)).split("....")[1]
            module_name = "%s.%s" % (new_package, filename[:-3])
            try_append_module(module_name, sys.modules)


def get_para_from_yaml(file_path, args):

    def func(a, b):
        if a is None:
            return None
        return a.get(b)

    if os.path.exists(file_path):
        with open(file_path) as f:
            value = yaml.safe_load(f)
            value = reduce(func, args.split('.'), value)

            if value is None:
                print 'parameter not found'
                return None

            return value
    else:
        print 'file not exist'
        return None


def makedirs(d):
    try:
        os.makedirs(d)
    except OSError as e:
        if e.errno != errno.EEXIST:
            raise


def execute_command(cmd):
    exec_msg = "Executing command: '%s'" % cmd
    logger.debug(exec_msg)

    output = subprocess.check_output(cmd.split()).split(os.linesep)

    return output


def source_env(env_file):
    p = subprocess.Popen(". %s; env" % env_file, stdout=subprocess.PIPE,
                         shell=True)
    output = p.communicate()[0]
    env = dict((line.split('=', 1) for line in output.splitlines()))
    os.environ.update(env)
    return env


def get_openstack_session():
    auth = identity.Password(auth_url=os.environ.get('OS_AUTH_URL'),
                             username=os.environ.get('OS_USERNAME'),
                             password=os.environ.get('OS_PASSWORD'),
                             tenant_name=os.environ.get('OS_TENANT_NAME'))
    return session.Session(auth=auth)


def get_neutron_client():
    sess = get_openstack_session()
    neutron_client = client.Client(session=sess)
    return neutron_client