#!/usr/bin/env python
#
# Copyright (c) 2017 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
import json
import logging
import os
import pkg_resources
import shlex
import shutil
import subprocess
import time

import requests

import functest.core.vnf as vnf
from functest.utils.constants import CONST
import functest.utils.functest_utils as ft_utils

__author__ = ("Valentin Boucher <valentin.boucher@orange.com>, "
              "Helen Yao <helanyao@gmail.com>")


class ClearwaterOnBoardingBase(vnf.VnfOnBoarding):
    """ vIMS clearwater base usable by several orchestrators"""

    def __init__(self, **kwargs):
        self.logger = logging.getLogger(__name__)
        super(ClearwaterOnBoardingBase, self).__init__(**kwargs)
        self.case_dir = pkg_resources.resource_filename(
            'functest', 'opnfv_tests/vnf/ims')
        self.data_dir = CONST.__getattribute__('dir_ims_data')
        self.result_dir = os.path.join(CONST.__getattribute__('dir_results'),
                                       self.case_name)
        self.test_dir = CONST.__getattribute__('dir_repo_vims_test')

        if not os.path.exists(self.data_dir):
            os.makedirs(self.data_dir)
        if not os.path.exists(self.result_dir):
            os.makedirs(self.result_dir)

    def config_ellis(self, ellis_ip, signup_code='secret', two_numbers=False):
        output_dict = {}
        self.logger.debug('Configure Ellis: %s', ellis_ip)
        output_dict['ellis_ip'] = ellis_ip
        account_url = 'http://{0}/accounts'.format(ellis_ip)
        params = {"password": "functest",
                  "full_name": "opnfv functest user",
                  "email": "functest@opnfv.org",
                  "signup_code": signup_code}
        rq = requests.post(account_url, data=params)
        output_dict['login'] = params
        if rq.status_code != 201 and rq.status_code != 409:
            raise Exception("Unable to create an account for number provision")
        self.logger.debug('Account is created on Ellis: %s', params)

        session_url = 'http://{0}/session'.format(ellis_ip)
        session_data = {
            'username': params['email'],
            'password': params['password'],
            'email': params['email']
        }
        rq = requests.post(session_url, data=session_data)
        if rq.status_code != 201:
            raise Exception('Failed to get cookie for Ellis')
        cookies = rq.cookies
        self.logger.debug('Cookies: %s', cookies)

        number_url = 'http://{0}/accounts/{1}/numbers'.format(
                     ellis_ip,
                     params['email'])
        self.logger.debug('Create 1st calling number on Ellis')
        i = 30
        while rq.status_code != 200 and i > 0:
            try:
                number_res = self.create_ellis_number(number_url, cookies)
                break
            except:
                if i == 1:
                    raise Exception("Unable to create a number")
                self.logger.warn("Unable to create a number. Retry ..")
                time.sleep(25)
            i = i - 1
        output_dict['number'] = number_res

        if two_numbers:
            self.logger.debug('Create 2nd calling number on Ellis')
            number_res = self.create_ellis_number(number_url, cookies)
            output_dict['number2'] = number_res

        return output_dict

    def create_ellis_number(self, number_url, cookies):
        rq = requests.post(number_url, cookies=cookies)

        if rq.status_code != 200:
            if rq and rq.json():
                reason = rq.json()['reason']
            else:
                reason = rq
            raise Exception("Unable to create a number: %s" % reason)
        number_res = rq.json()
        self.logger.info('Calling number is created: %s', number_res)
        return number_res

    def run_clearwater_live_test(self, dns_ip, public_domain,
                                 bono_ip=None, ellis_ip=None,
                                 signup_code='secret'):
        self.logger.info('Run Clearwater live test')
        dns_file = '/etc/resolv.conf'
        dns_file_bak = '/etc/resolv.conf.bak'
        self.logger.debug('Backup %s -> %s', dns_file, dns_file_bak)
        shutil.copy(dns_file, dns_file_bak)
        cmd = ("dnsmasq -d -u root --server=/clearwater.opnfv/{0} "
               "-r /etc/resolv.conf.bak".format(dns_ip))
        dnsmasq_process = subprocess.Popen(shlex.split(cmd))
        script = ('echo -e "nameserver {0}" > {1};'
                  'cd {2};'
                  'rake test[{3}] SIGNUP_CODE={4}'
                  .format('127.0.0.1',
                          dns_file,
                          self.test_dir,
                          public_domain,
                          signup_code))
        if bono_ip and ellis_ip:
            subscript = ' PROXY={0} ELLIS={1}'.format(bono_ip, ellis_ip)
            script = '{0}{1}'.format(script, subscript)
        script = ('{0}{1}'.format(script, ' --trace'))
        cmd = "/bin/bash -c '{0}'".format(script)
        self.logger.debug('Live test cmd: %s', cmd)
        output_file = os.path.join(self.result_dir, "ims_test_output.txt")
        ft_utils.execute_command(cmd,
                                 error_msg='Clearwater live test failed',
                                 output_file=output_file)
        dnsmasq_process.kill()
        with open(dns_file_bak, 'r') as bak_file:
            result = bak_file.read()
            with open(dns_file, 'w') as f:
                f.write(result)

        f = open(output_file, 'r')
        result = f.read()
        if result != "":
            self.logger.debug(result)

        vims_test_result = ""
        tempFile = os.path.join(self.test_dir, "temp.json")
        try:
            self.logger.debug("Trying to load test results")
            with open(tempFile) as f:
                vims_test_result = json.load(f)
            f.close()
        except Exception:
            self.logger.error("Unable to retrieve test results")

        try:
            os.remove(tempFile)
        except Exception:
            self.logger.error("Deleting file failed")

        return vims_test_result