##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from __future__ import absolute_import
from __future__ import print_function

import os
import sys
import time

from six.moves import range

from yardstick.common import constants as consts
from yardstick.common.httpClient import HttpClient


class EnvCommand(object):
    """

        Set of commands to prepare environment
    """

    def do_influxdb(self, args):
        data = {'action': 'create_influxdb'}
        task_id = self._start_async_task(data)

        start = '* creating influxDB'
        self._check_status(task_id, start)

    def do_grafana(self, args):
        data = {'action': 'create_grafana'}
        task_id = self._start_async_task(data)

        start = '* creating grafana'
        self._check_status(task_id, start)

    def do_prepare(self, args):
        data = {'action': 'prepare_env'}
        task_id = self._start_async_task(data)

        start = '* preparing yardstick environment'
        self._check_status(task_id, start)

    def _start_async_task(self, data):
        url = consts.ENV_ACTION_API
        return HttpClient().post(url, data)['result']['task_id']

    def _check_status(self, task_id, start):
        self._print_status(start, '[]\r')
        url = '{}?task_id={}'.format(consts.ASYNC_TASK_API, task_id)

        CHECK_STATUS_RETRY = 20
        CHECK_STATUS_DELAY = 5

        for retry in range(CHECK_STATUS_RETRY):
            response = HttpClient().get(url)
            status = response['status']

            if status:
                break

            # wait until the async task finished
            time.sleep(CHECK_STATUS_DELAY * (retry + 1))

        switcher = {
            0: 'Timeout',
            1: 'Finished',
            2: 'Error'
        }
        self._print_status(start, '[{}]'.format(switcher[status]))
        if status == 2:
            print(response['result'])
            sys.stdout.flush()
        return status

    def _print_status(self, s, e):
        try:
            columns = int(os.popen('stty size', 'r').read().split()[1])
            word = '{}{}{}'.format(s, ' ' * (columns - len(s) - len(e)), e)
            sys.stdout.write(word)
            sys.stdout.flush()
        except IndexError:
            pass