#!/usr/bin/env python
#
# Copyright (c) 2015 Ericsson
# jose.lausuch@ericsson.com
# 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 logging
import os
import shutil
import subprocess
import sys
import yaml
import functest_utils
import openstack_utils
from neutronclient.v2_0 import client as neutronclient

actions = ['start', 'check', 'clean']
parser = argparse.ArgumentParser()
parser.add_argument("action", help="Possible actions are: "
                    "'{d[0]}|{d[1]}|{d[2]}' ".format(d=actions))
parser.add_argument("-d", "--debug", help="Debug mode", action="store_true")
parser.add_argument("-f", "--force", help="Force", action="store_true")
args = parser.parse_args()


""" logging configuration """
logger = logging.getLogger('config_functest')
logger.setLevel(logging.DEBUG)

ch = logging.StreamHandler()
if args.debug:
    ch.setLevel(logging.DEBUG)
else:
    ch.setLevel(logging.INFO)

formatter = logging.Formatter('%(asctime)s - %(name)s - '
                              '%(levelname)s - %(message)s')
ch.setFormatter(formatter)
logger.addHandler(ch)

REPOS_DIR = os.environ['repos_dir']
FUNCTEST_REPO = REPOS_DIR + '/functest/'
if not os.path.exists(FUNCTEST_REPO):
    logger.error("Functest repository directory not found '%s'"
                 % FUNCTEST_REPO)
    exit(-1)
sys.path.append(FUNCTEST_REPO + "testcases/")

with open("/home/opnfv/functest/conf/config_functest.yaml") as f:
    functest_yaml = yaml.safe_load(f)
f.close()


""" global variables """
# Directories
RALLY_DIR = FUNCTEST_REPO + functest_yaml.get("general").get(
    "directories").get("dir_rally")
RALLY_REPO_DIR = functest_yaml.get("general").get(
    "directories").get("dir_repo_rally")
RALLY_INSTALLATION_DIR = functest_yaml.get("general").get(
    "directories").get("dir_rally_inst")
RALLY_RESULT_DIR = functest_yaml.get("general").get(
    "directories").get("dir_rally_res")
TEMPEST_REPO_DIR = functest_yaml.get("general").get(
    "directories").get("dir_repo_tempest")
VPING_DIR = FUNCTEST_REPO + functest_yaml.get("general").get(
    "directories").get("dir_vping")
ODL_DIR = FUNCTEST_REPO + functest_yaml.get("general").get(
    "directories").get("dir_odl")
DATA_DIR = functest_yaml.get("general").get(
    "directories").get("dir_functest_data")

# Tempest/Rally configuration details
DEPLOYMENT_MAME = functest_yaml.get("rally").get("deployment_name")

# Image (cirros)
IMAGE_FILE_NAME = functest_yaml.get("general").get("openstack").get(
    "image_file_name")
IMAGE_PATH = DATA_DIR + "/" + IMAGE_FILE_NAME

# NEUTRON Private Network parameters
NEUTRON_PRIVATE_NET_NAME = functest_yaml.get("general").get(
    "openstack").get("neutron_private_net_name")
NEUTRON_PRIVATE_SUBNET_NAME = functest_yaml.get("general").get(
    "openstack").get("neutron_private_subnet_name")
NEUTRON_PRIVATE_SUBNET_CIDR = functest_yaml.get("general").get(
    "openstack").get("neutron_private_subnet_cidr")
NEUTRON_ROUTER_NAME = functest_yaml.get("general").get(
    "openstack").get("neutron_router_name")

creds_neutron = openstack_utils.get_credentials("neutron")
neutron_client = neutronclient.Client(**creds_neutron)


def action_start():
    """
    Start the functest environment installation
    """
    if not functest_utils.check_internet_connectivity():
        logger.info("No Internet connectivity. "
                    "This may affect some test case suites.")

    if action_check():
        logger.info("Functest environment already installed. Nothing to do.")
        exit(0)

    else:
        # Clean in case there are left overs
        logger.debug("Cleaning possible functest environment leftovers.")
        action_clean()
        logger.info("Starting installation of functest environment")

        private_net = openstack_utils.get_private_net(neutron_client)
        if private_net is None:
            # If there is no private network in the deployment we create one
            if not create_private_neutron_net(neutron_client):
                logger.error("There has been a problem while "
                             "creating the functest network.")
                action_clean()
                exit(-1)
        else:
            logger.info("Private network '%s' already existing in "
                        "the deployment." % private_net['name'])

        logger.info("Installing Rally...")
        if not install_rally():
            logger.error("There has been a problem while installing Rally.")
            action_clean()
            exit(-1)

        # Create result folder under functest if necessary
        if not os.path.exists(RALLY_RESULT_DIR):
            os.makedirs(RALLY_RESULT_DIR)

        try:
            logger.info("CI: Generate the list of executable tests.")
            runnable_test = functest_utils.generateTestcaseList(functest_yaml)
            logger.info("List of runnable tests generated: %s" % runnable_test)
        except:
            logger.error("Impossible to generate the list of runnable tests")

        exit(0)


def action_check():
    """
    Check if the functest environment is properly installed
    """
    errors_all = False
    logger.info("Checking current functest configuration...")

    logger.debug("Checking script directories...")

    dirs = [RALLY_DIR, RALLY_INSTALLATION_DIR, VPING_DIR, ODL_DIR]
    for dir in dirs:
        if not os.path.exists(dir):
            logger.debug("   %s NOT found" % dir)
            errors_all = True
        else:
            logger.debug("   %s found" % dir)

    logger.debug("Checking Rally deployment...")
    if not check_rally():
        logger.debug("   Rally deployment NOT installed.")
        errors_all = True

    logger.debug("Checking Image...")
    if not os.path.isfile(IMAGE_PATH):
        logger.debug("   Image file '%s' NOT found." % IMAGE_PATH)
        errors_all = True
    else:
        logger.debug("   Image file found in %s" % IMAGE_PATH)

    # TODO: check OLD environment setup
    return not errors_all


def action_clean():
    """
    Clean the existing functest environment
    """
    logger.info("Removing current functest environment...")
    if os.path.exists(RALLY_INSTALLATION_DIR):
        logger.debug("Removing Rally installation directory %s"
                     % RALLY_INSTALLATION_DIR)
        shutil.rmtree(RALLY_INSTALLATION_DIR, ignore_errors=True)

    if os.path.exists(RALLY_RESULT_DIR):
        logger.debug("Removing Result directory")
        shutil.rmtree(RALLY_RESULT_DIR, ignore_errors=True)

    logger.info("Functest environment clean!")


def install_rally():
    if check_rally():
        logger.info("Rally is already installed.")
    else:
        logger.debug("Creating Rally environment...")
        cmd = "rally deployment create --fromenv --name=" + DEPLOYMENT_MAME
        functest_utils.execute_command(cmd, logger)

        logger.debug("Installing tempest from existing repo...")
        cmd = ("rally verify install --source " + TEMPEST_REPO_DIR +
               " --system-wide")
        functest_utils.execute_command(cmd, logger)

        cmd = "rally deployment check"
        functest_utils.execute_command(cmd, logger)
        # TODO: check that everything is 'Available' and warn if not

        cmd = "rally show images"
        functest_utils.execute_command(cmd, logger)

        cmd = "rally show flavors"
        functest_utils.execute_command(cmd, logger)

    return True


def check_rally():
    """
    Check if Rally is installed and properly configured
    """
    if os.path.exists(RALLY_INSTALLATION_DIR):
        logger.debug("   Rally installation directory found in %s"
                     % RALLY_INSTALLATION_DIR)
        FNULL = open(os.devnull, 'w')
        cmd = "rally deployment list | grep " + DEPLOYMENT_MAME
        logger.debug('   Executing command : {}'.format(cmd))
        p = subprocess.Popen(cmd, shell=True,
                             stdout=subprocess.PIPE, stderr=FNULL)
        # if the command does not exist or there is no deployment
        line = p.stdout.readline()
        if line == "":
            logger.debug("   Rally deployment NOT found")
            return False
        logger.debug("   Rally deployment found")
        return True
    else:
        return False


def create_private_neutron_net(neutron):
    neutron.format = 'json'
    logger.info("Creating network '%s'..." % NEUTRON_PRIVATE_NET_NAME)
    network_id = openstack_utils.create_neutron_net(
        neutron, NEUTRON_PRIVATE_NET_NAME)

    if not network_id:
        return False
    logger.debug("Network '%s' created successfully." % network_id)

    logger.info("Updating network '%s' with shared=True..."
                % NEUTRON_PRIVATE_NET_NAME)
    if openstack_utils.update_neutron_net(neutron, network_id, shared=True):
        logger.debug("Network '%s' updated successfully." % network_id)
    else:
        logger.info("Updating neutron network '%s' failed" % network_id)

    logger.info("Creating Subnet....")
    subnet_id = openstack_utils.create_neutron_subnet(
        neutron, NEUTRON_PRIVATE_SUBNET_NAME, NEUTRON_PRIVATE_SUBNET_CIDR,
        network_id)
    if not subnet_id:
        return False
    logger.debug("Subnet '%s' created successfully." % subnet_id)
    logger.info("Creating Router...")
    router_id = openstack_utils.create_neutron_router(neutron,
                                                      NEUTRON_ROUTER_NAME)

    if not router_id:
        return False

    logger.debug("Router '%s' created successfully." % router_id)
    logger.info("Adding router to subnet...")

    result = openstack_utils.add_interface_router(neutron,
                                                  router_id,
                                                  subnet_id)

    if not result:
        return False

    logger.debug("Interface added successfully.")
    return True


def main():
    if not (args.action in actions):
        logger.error('argument not valid')
        exit(-1)

    if not openstack_utils.check_credentials():
        logger.error("Please source the openrc credentials and "
                     "run the script again.")
        # TODO: source the credentials in this script
        exit(-1)

    if args.action == "start":
        action_start()

    if args.action == "check":
        if action_check():
            logger.info("Functest environment correctly installed")
        else:
            logger.info("Functest environment not found or faulty")

    if args.action == "clean":
        if args.force:
            action_clean()
        else:
            while True:
                print("Are you sure? [y|n]")
                answer = raw_input("")
                if answer == "y":
                    action_clean()
                    break
                elif answer == "n":
                    break
                else:
                    print("Invalid option.")
    exit(0)


if __name__ == '__main__':
    main()