#    Copyright 2013-2014 Mirantis, Inc.
#
#    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.

try:
    from unittest.case import TestCase
except ImportError:
    # Runing unit-tests in production environment
    from unittest2.case import TestCase

from mock import patch

import logging
import os
import shutil
import subprocess
import sys
import tempfile

from fuelclient.cli.parser import main


logging.basicConfig(stream=sys.stderr)
log = logging.getLogger("CliTest.ExecutionLog")
log.setLevel(logging.DEBUG)


class CliExectutionResult:
    def __init__(self, process_handle, out, err):
        self.return_code = process_handle.returncode
        self.stdout = out
        self.stderr = err

    @property
    def has_errors(self):
        return bool(len(self.stderr))

    @property
    def is_return_code_zero(self):
        return self.return_code == 0


class UnitTestCase(TestCase):
    """Base test class which does not require nailgun server to run."""

    def execute(self, command):
        return main(command)

    def execute_wo_auth(self, command):
        with patch('fuelclient.client.Client.auth_required') as auth:
            auth.return_value = False
            return self.execute(command)


class BaseTestCase(UnitTestCase):
    nailgun_root = os.environ.get('NAILGUN_ROOT', '/tmp/fuel_web/nailgun')

    manage_path = os.path.join(nailgun_root, 'manage.py')

    def setUp(self):
        self.reload_nailgun_server()
        self.temp_directory = tempfile.mkdtemp()

    def tearDown(self):
        shutil.rmtree(self.temp_directory)

    @staticmethod
    def run_command(*args):
        handle = subprocess.Popen(
            [" ".join(args)],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            shell=True
        )
        log.debug("Running " + " ".join(args))
        out, err = handle.communicate()
        log.debug("Finished command with {0} - {1}".format(out, err))

    def upload_command(self, cmd):
        return "{0} --upload --dir {1}".format(cmd, self.temp_directory)

    def download_command(self, cmd):
        return "{0} --download --dir {1}".format(cmd, self.temp_directory)

    @classmethod
    def reload_nailgun_server(cls):
        for action in ("dropdb", "syncdb", "loaddefault"):
            cls.run_command(cls.manage_path, action)

    @classmethod
    def load_data_to_nailgun_server(cls):
        file_path = os.path.join(cls.nailgun_root,
                                 'nailgun/fixtures/sample_environment.json')

        cls.run_command(cls.manage_path, "loaddata {0}".format(file_path))

    def run_cli_command(self, command_line, check_errors=False):
        modified_env = os.environ.copy()
        command_args = [" ".join(('fuel', command_line))]
        process_handle = subprocess.Popen(
            command_args,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            shell=True,
            env=modified_env
        )
        out, err = process_handle.communicate()
        result = CliExectutionResult(process_handle, out, err)
        log.debug("command_args: '%s',stdout: '%s', stderr: '%s'",
                  command_args[0], out, err)
        if not check_errors:
            if not result.is_return_code_zero or result.has_errors:
                self.fail(err)
        return result

    def run_cli_commands(self, command_lines, **kwargs):
        for command in command_lines:
            self.run_cli_command(command, **kwargs)

    def check_if_required(self, command):
        call = self.run_cli_command(command, check_errors=True)
        #should not work without env id
        self.assertIn("required", call.stderr)

    def check_for_stdout(self, command, msg):
        call = self.run_cli_command(command)
        self.assertEqual(call.stdout, msg)

    def check_all_in_msg(self, command, substrings, **kwargs):
        output = self.run_cli_command(command, **kwargs)
        for substring in substrings:
            self.assertIn(substring, output.stdout)

    def check_for_rows_in_table(self, command):
        output = self.run_cli_command(command)
        message = output.stdout.split("\n")
        #no env
        self.assertEqual(message[2], '')

    def check_number_of_rows_in_table(self, command, number_of_rows):
        output = self.run_cli_command(command)
        self.assertEqual(len(output.stdout.split("\n")), number_of_rows + 3)