# 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.

from oslo_utils import encodeutils
from six.moves import configparser

import inspect
import json
import os
import pwd
import shutil
import subprocess
import tempfile

TEST_ENV = {
    "OS_USERNAME": "admin",
    "OS_PASSWORD": "admin",
    "OS_TENANT_NAME": "admin",
    "OS_AUTH_URL": "http://fake/",
}

DEPLOYMENT_FILE = "/tmp/rally_functests_main_deployment.json"


class RallyCmdError(Exception):

    def __init__(self, code, output):
        self.code = code
        self.output = encodeutils.safe_decode(output)

    def __str__(self):
        return "Code: %d Output: %s\n" % (self.code, self.output)

    def __unicode__(self):
        return "Code: %d Output: %s\n" % (self.code, self.output)


class TaskConfig(object):

    def __init__(self, config):
        config_file = tempfile.NamedTemporaryFile(delete=False)
        config_file.write(encodeutils.safe_encode(json.dumps(config)))
        config_file.close()
        self.filename = config_file.name

    def __del__(self):
        os.unlink(self.filename)


class Rally(object):
    """Create and represent separate rally installation.

    Usage:

        rally = Rally()
        rally("deployment", "create", "--name", "Some Deployment Name")
        output = rally("deployment list")

    """

    def __init__(self, fake=False):
        # NOTE(sskripnick): we shoud change home dir to avoid races
        # and do not touch any user files in ~/.rally
        os.environ["HOME"] = pwd.getpwuid(os.getuid()).pw_dir
        if not os.path.exists(DEPLOYMENT_FILE):
            subprocess.call("rally deployment config > %s" % DEPLOYMENT_FILE,
                            shell=True)
        self.tmp_dir = tempfile.mkdtemp()
        os.environ["HOME"] = self.tmp_dir

        if "RCI_KEEP_DB" not in os.environ:
            config_filename = os.path.join(self.tmp_dir, "conf")
            config = configparser.RawConfigParser()
            config.add_section("database")
            config.set("database", "connection",
                       "sqlite:///%s/db" % self.tmp_dir)
            with open(config_filename, "w") as conf:
                config.write(conf)
            self.args = ["rally", "--config-file", config_filename]
            subprocess.call(["rally-manage", "--config-file", config_filename,
                             "db", "recreate"])
        else:
            self.args = ["rally"]
            subprocess.call(["rally-manage", "db", "recreate"])

        self.reports_root = os.environ.get("REPORTS_ROOT",
                                           "rally-cli-output-files")
        self._created_files = list()

        self("deployment create --file %s --name MAIN" % DEPLOYMENT_FILE,
             write_report=False)

    def __del__(self):
        shutil.rmtree(self.tmp_dir)

    def gen_report_path(self, suffix=None, extension=None, keep_old=False):
        """Report file path/name modifier

        :param suffix: suffix that will be appended to filename.
            It will be appended before extension
        :param extension: file extension.
        :param keep_old: if True, previous reports will not be deleted,
            but rename to 'nameSuffix.old*.extension'

        :return: complete report name to write report
        """
        caller_frame = inspect.currentframe().f_back
        if caller_frame.f_code.co_name == "__call__":
            caller_frame = caller_frame.f_back

        method_name = caller_frame.f_code.co_name
        test_object = caller_frame.f_locals["self"]
        class_name = test_object.__class__.__name__

        if not os.path.exists("%s/%s" % (self.reports_root, class_name)):
            os.makedirs("%s/%s" % (self.reports_root, class_name))

        suff = suffix or ""
        ext = extension or "txt"
        path = "%s/%s/%s%s.%s" % (self.reports_root, class_name,
                                  method_name, suff, ext)

        if path not in self._created_files:
            if os.path.exists(path):
                if not keep_old:
                    os.remove(path)
                else:
                    path_list = path.split(".")
                    old_suff = "old"
                    path_list.insert(-1, old_suff)
                    new_path = ".".join(path_list)
                    count = 0
                    while os.path.exists(new_path):
                        count += 1
                        path_list[-2] = "old%d" % count
                        new_path = ".".join(path_list)
                    os.rename(path, new_path)

            self._created_files.append(path)
        return path

    def __call__(self, cmd, getjson=False, report_path=None, raw=False,
                 suffix=None, extension=None, keep_old=False,
                 write_report=True):
        """Call rally in the shell

        :param cmd: rally command
        :param getjson: in cases, when rally prints JSON, you can catch output
            deserialized
        :param report_path: if present, rally command and its output will be
            written to file with passed file name
        :param raw: don't write command itself to report file. Only output
            will be written
        """

        if not isinstance(cmd, list):
            cmd = cmd.split(" ")
        try:
            output = encodeutils.safe_decode(subprocess.check_output(
                self.args + cmd, stderr=subprocess.STDOUT))

            if write_report:
                if not report_path:
                    report_path = self.gen_report_path(
                        suffix=suffix, extension=extension, keep_old=keep_old)
                with open(report_path, "a") as rep:
                    if not raw:
                        rep.write("\n%s:\n" % " ".join(self.args + cmd))
                    rep.write("%s\n" % output)

            if getjson:
                return json.loads(output)
            return output
        except subprocess.CalledProcessError as e:
            raise RallyCmdError(e.returncode, e.output)