#!/usr/bin/env python
#
# 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 argparse
import json
import logging
import logging.config
import os
import pkg_resources
import re
import subprocess
import sys
import fileinput

import yaml

import functest.utils.functest_utils as ft_utils
import functest.utils.openstack_utils as os_utils
from functest.utils.constants import CONST

from opnfv.utils import constants as opnfv_constants
from opnfv.deployment import factory

actions = ['start', 'check']

""" logging configuration """
logger = logging.getLogger('functest.ci.prepare_env')
handler = None
# set the architecture to default
pod_arch = None
arch_filter = ['aarch64']

CONFIG_FUNCTEST_PATH = pkg_resources.resource_filename(
            'functest', 'ci/config_functest.yaml')
CONFIG_PATCH_PATH = pkg_resources.resource_filename(
            'functest', 'ci/config_patch.yaml')
CONFIG_AARCH64_PATCH_PATH = pkg_resources.resource_filename(
            'functest', 'ci/config_aarch64_patch.yaml')
RALLY_CONF_PATH = "/etc/rally/rally.conf"
RALLY_AARCH64_PATCH_PATH = pkg_resources.resource_filename(
            'functest', 'ci/rally_aarch64_patch.conf')


class PrepareEnvParser(object):

    def __init__(self):
        self.parser = argparse.ArgumentParser()
        self.parser.add_argument("action", help="Possible actions are: "
                                 "'{d[0]}|{d[1]}' ".format(d=actions),
                                 choices=actions)
        self.parser.add_argument("-d", "--debug", help="Debug mode",
                                 action="store_true")

    def parse_args(self, argv=[]):
        return vars(self.parser.parse_args(argv))


def print_separator():
    logger.info("==============================================")


def check_env_variables():
    print_separator()
    logger.info("Checking environment variables...")

    if CONST.__getattribute__('INSTALLER_TYPE') is None:
        logger.warning("The env variable 'INSTALLER_TYPE' is not defined.")
        CONST.__setattr__('INSTALLER_TYPE', 'undefined')
    else:
        if (CONST.__getattribute__('INSTALLER_TYPE') not in
                opnfv_constants.INSTALLERS):
            logger.warning("INSTALLER_TYPE=%s is not a valid OPNFV installer. "
                           "Available OPNFV Installers are : %s. "
                           "Setting INSTALLER_TYPE=undefined."
                           % (CONST.__getattribute__('INSTALLER_TYPE'),
                              opnfv_constants.INSTALLERS))
            CONST.__setattr__('INSTALLER_TYPE', 'undefined')
        else:
            logger.info("    INSTALLER_TYPE=%s"
                        % CONST.__getattribute__('INSTALLER_TYPE'))

    if CONST.__getattribute__('INSTALLER_IP') is None:
        logger.warning(
            "The env variable 'INSTALLER_IP' is not defined. It is recommended"
            " to extract some information from the deployment")
    else:
        logger.info("    INSTALLER_IP=%s" %
                    CONST.__getattribute__('INSTALLER_IP'))

    if CONST.__getattribute__('DEPLOY_SCENARIO') is None:
        logger.warning("The env variable 'DEPLOY_SCENARIO' is not defined. "
                       "Setting CI_SCENARIO=undefined.")
        CONST.__setattr__('DEPLOY_SCENARIO', 'undefined')
    else:
        logger.info("    DEPLOY_SCENARIO=%s"
                    % CONST.__getattribute__('DEPLOY_SCENARIO'))
    if CONST.__getattribute__('CI_DEBUG'):
        logger.info("    CI_DEBUG=%s" % CONST.__getattribute__('CI_DEBUG'))

    if CONST.__getattribute__('NODE_NAME'):
        logger.info("    NODE_NAME=%s" % CONST.__getattribute__('NODE_NAME'))

    if CONST.__getattribute__('BUILD_TAG'):
        logger.info("    BUILD_TAG=%s" % CONST.__getattribute__('BUILD_TAG'))

    if CONST.__getattribute__('IS_CI_RUN'):
        logger.info("    IS_CI_RUN=%s" % CONST.__getattribute__('IS_CI_RUN'))


def get_deployment_handler():
    global handler
    global pod_arch

    installer_params_yaml = pkg_resources.resource_filename(
            'functest', 'ci/installer_params.yaml')
    if (CONST.__getattribute__('INSTALLER_IP') and
        CONST.__getattribute__('INSTALLER_TYPE') and
            CONST.__getattribute__('INSTALLER_TYPE') in
            opnfv_constants.INSTALLERS):
        try:
            installer_params = ft_utils.get_parameter_from_yaml(
                CONST.__getattribute__('INSTALLER_TYPE'),
                installer_params_yaml)
        except ValueError as e:
            logger.debug('Printing deployment info is not supported for %s' %
                         CONST.__getattribute__('INSTALLER_TYPE'))
            logger.debug(e)
        else:
            user = installer_params.get('user', None)
            password = installer_params.get('password', None)
            pkey = installer_params.get('pkey', None)
            try:
                handler = factory.Factory.get_handler(
                    installer=CONST.__getattribute__('INSTALLER_TYPE'),
                    installer_ip=CONST.__getattribute__('INSTALLER_IP'),
                    installer_user=user,
                    installer_pwd=password,
                    pkey_file=pkey)
                if handler:
                    pod_arch = handler.get_arch()
            except Exception as e:
                logger.debug("Cannot get deployment information. %s" % e)


def create_directories():
    print_separator()
    logger.info("Creating needed directories...")
    if not os.path.exists(CONST.__getattribute__('dir_functest_conf')):
        os.makedirs(CONST.__getattribute__('dir_functest_conf'))
        logger.info("    %s created." %
                    CONST.__getattribute__('dir_functest_conf'))
    else:
        logger.debug("   %s already exists." %
                     CONST.__getattribute__('dir_functest_conf'))

    if not os.path.exists(CONST.__getattribute__('dir_functest_data')):
        os.makedirs(CONST.__getattribute__('dir_functest_data'))
        logger.info("    %s created." %
                    CONST.__getattribute__('dir_functest_data'))
    else:
        logger.debug("   %s already exists." %
                     CONST.__getattribute__('dir_functest_data'))
    if not os.path.exists(CONST.__getattribute__('dir_functest_images')):
        os.makedirs(CONST.__getattribute__('dir_functest_images'))
        logger.info("    %s created." %
                    CONST.__getattribute__('dir_functest_images'))
    else:
        logger.debug("   %s already exists." %
                     CONST.__getattribute__('dir_functest_images'))


def source_rc_file():
    print_separator()

    if CONST.__getattribute__('openstack_creds') is None:
        logger.warning("The environment variable 'creds' must be set and"
                       "pointing to the local RC file. Using default: "
                       "/home/opnfv/functest/conf/openstack.creds ...")
        os.path.join(
            CONST.__getattribute__('dir_functest_conf'), 'openstack.creds')

    if not os.path.isfile(CONST.__getattribute__('openstack_creds')):
        raise Exception(
            "OpenStack credentials file not provided. "
            "The OpenStack credentials must be in {}"
            .format(CONST.__getattribute__('openstack_creds')))
    else:
        logger.info("RC file provided in %s."
                    % CONST.__getattribute__('openstack_creds'))
        if os.path.getsize(CONST.__getattribute__('openstack_creds')) == 0:
            raise Exception(
                "The OpenStack RC file {} is empty."
                .format(CONST.__getattribute__('openstack_creds')))

    logger.info("Sourcing the OpenStack RC file...")
    os_utils.source_credentials(CONST.__getattribute__('openstack_creds'))
    for key, value in os.environ.iteritems():
        if re.search("OS_", key):
            if key == 'OS_AUTH_URL':
                CONST.__setattr__('OS_AUTH_URL', value)
            elif key == 'OS_USERNAME':
                CONST.__setattr__('OS_USERNAME', value)
            elif key == 'OS_TENANT_NAME':
                CONST.__setattr__('OS_TENANT_NAME', value)
            elif key == 'OS_PASSWORD':
                CONST.__setattr__('OS_PASSWORD', value)


def update_config_file():
    patch_file(CONFIG_PATCH_PATH)

    if pod_arch and pod_arch in arch_filter:
        patch_file(CONFIG_AARCH64_PATCH_PATH)

    if "TEST_DB_URL" in os.environ:
        update_db_url()


def patch_file(patch_file_path):
    logger.debug('Updating file: %s', patch_file_path)
    with open(patch_file_path) as f:
        patch_file = yaml.safe_load(f)

    updated = False
    for key in patch_file:
        if key in CONST.__getattribute__('DEPLOY_SCENARIO'):
            new_functest_yaml = dict(ft_utils.merge_dicts(
                ft_utils.get_functest_yaml(), patch_file[key]))
            updated = True

    if updated:
        os.remove(CONFIG_FUNCTEST_PATH)
        with open(CONFIG_FUNCTEST_PATH, "w") as f:
            f.write(yaml.dump(new_functest_yaml, default_style='"'))


def update_db_url():
    with open(CONFIG_FUNCTEST_PATH) as f:
        functest_yaml = yaml.safe_load(f)

    with open(CONFIG_FUNCTEST_PATH, "w") as f:
        functest_yaml["results"]["test_db_url"] = os.environ.get('TEST_DB_URL')
        f.write(yaml.dump(functest_yaml, default_style='"'))


def verify_deployment():
    print_separator()
    logger.info("Verifying OpenStack services...")
    cmd = "check_os.sh"

    logger.debug("Executing command: %s" % cmd)
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)

    while p.poll() is None:
        line = p.stdout.readline().rstrip()
        if "ERROR" in line:
            logger.error(line)
            raise Exception("Problem while running '{}'.".format(cmd))
        logger.info(line)


def install_rally():
    print_separator()

    if pod_arch and pod_arch in arch_filter:
        logger.info("Apply aarch64 specific to rally config...")
        with open(RALLY_AARCH64_PATCH_PATH, "r") as f:
            rally_patch_conf = f.read()

        for line in fileinput.input(RALLY_CONF_PATH, inplace=1):
            print line,
            if "cirros|testvm" in line:
                print rally_patch_conf

    logger.info("Creating Rally environment...")

    cmd = "rally deployment destroy opnfv-rally"
    ft_utils.execute_command(cmd, error_msg=(
        "Deployment %s does not exist."
        % CONST.__getattribute__('rally_deployment_name')),
        verbose=False)

    rally_conf = os_utils.get_credentials_for_rally()
    with open('rally_conf.json', 'w') as fp:
        json.dump(rally_conf, fp)
    cmd = ("rally deployment create "
           "--file=rally_conf.json --name={0}"
           .format(CONST.__getattribute__('rally_deployment_name')))
    error_msg = "Problem while creating Rally deployment"
    ft_utils.execute_command_raise(cmd, error_msg=error_msg)

    cmd = "rally deployment check"
    error_msg = "OpenStack not responding or faulty Rally deployment."
    ft_utils.execute_command_raise(cmd, error_msg=error_msg)

    cmd = "rally deployment list"
    ft_utils.execute_command(cmd,
                             error_msg=("Problem while listing "
                                        "Rally deployment."))

    cmd = "rally plugin list | head -5"
    ft_utils.execute_command(cmd,
                             error_msg=("Problem while showing "
                                        "Rally plugins."))


def install_tempest():
    logger.info("Installing tempest from existing repo...")
    cmd = ("rally verify list-verifiers | "
           "grep '{0}' | wc -l".format(
               CONST.__getattribute__('tempest_deployment_name')))
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
    while p.poll() is None:
        line = p.stdout.readline().rstrip()
        if str(line) == '0':
            logger.debug("Tempest %s does not exist" %
                         CONST.__getattribute__('tempest_deployment_name'))
            cmd = ("rally verify create-verifier --source {0} "
                   "--name {1} --type tempest --system-wide"
                   .format(CONST.__getattribute__('dir_repo_tempest'),
                           CONST.__getattribute__('tempest_deployment_name')))
            error_msg = "Problem while installing Tempest."
            ft_utils.execute_command_raise(cmd, error_msg=error_msg)


def create_flavor():
    _, flavor_id = os_utils.get_or_create_flavor('m1.tiny',
                                                 '512',
                                                 '1',
                                                 '1',
                                                 public=True)
    if flavor_id is None:
        raise Exception('Failed to create flavor')


def check_environment():
    msg_not_active = "The Functest environment is not installed."
    if not os.path.isfile(CONST.__getattribute__('env_active')):
        raise Exception(msg_not_active)

    with open(CONST.__getattribute__('env_active'), "r") as env_file:
        s = env_file.read()
        if not re.search("1", s):
            raise Exception(msg_not_active)

    logger.info("Functest environment is installed.")


def print_deployment_info():
    if handler:
        logger.info('\n\nDeployment information:\n%s' %
                    handler.get_deployment_info())


def prepare_env(**kwargs):
    try:
        if not (kwargs['action'] in actions):
            logger.error('Argument not valid.')
            return -1
        elif kwargs['action'] == "start":
            logger.info("######### Preparing Functest environment #########\n")
            check_env_variables()
            create_directories()
            source_rc_file()
            update_config_file()
            verify_deployment()
            install_rally()
            install_tempest()
            create_flavor()
            with open(CONST.__getattribute__('env_active'), "w") as env_file:
                env_file.write("1")
            check_environment()
        elif kwargs['action'] == "check":
            check_environment()
    except Exception as e:
        logger.error(e)
        return -1
    return 0


def main():
    logging.config.fileConfig(pkg_resources.resource_filename(
        'functest', 'ci/logging.ini'))
    parser = PrepareEnvParser()
    args = parser.parse_args(sys.argv[1:])
    return prepare_env(**args)


if __name__ == '__main__':
    sys.exit(main())