#!/usr/bin/env python3
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#

import os
import sys
from sys import exit
from muchos.config import DeployConfig
from muchos.util import parse_args
from os.path import isfile, join


def main():
    deploy_path = os.environ.get('MUCHOS_HOME')
    if not deploy_path:
        exit('ERROR - MUCHOS_HOME env variable must be set!')
    if not os.path.isdir(deploy_path):
        exit('ERROR - Directory set by MUCHOS_HOME does not exist: ' + deploy_path)

    config_path = join(deploy_path, "conf/muchos.props")
    if not isfile(config_path):
        exit('ERROR - A config file does not exist at ' + config_path)
    checksums_path = join(deploy_path, "conf/checksums")
    if not isfile(checksums_path):
        exit('ERROR - A checksums file does not exist at ' + checksums_path)

    hosts_dir = join(deploy_path, "conf/hosts/")

    # parse command line args
    retval = parse_args(hosts_dir)
    if not retval:
        print("Invalid command line arguments. For help, use 'muchos -h'")
        sys.exit(1)
    (opts, action, args) = retval

    hosts_path = join(hosts_dir, opts.cluster)

    config = DeployConfig(deploy_path, config_path, hosts_path, checksums_path, opts.cluster)
    config.verify_config(action)

    if action == 'config':
        if opts.property == 'all':
            config.print_all()
        else:
            config.print_property(opts.property)
    else:
        cluster_type = config.get('general', 'cluster_type')
        if cluster_type == 'existing':
            from muchos.existing import ExistingCluster
            cluster = ExistingCluster(config)
            cluster.perform(action)
        elif cluster_type == 'ec2':
            from muchos.ec2 import Ec2Cluster
            cluster = Ec2Cluster(config)
            cluster.perform(action)
        else:
            exit('Unknown cluster_type: ' + cluster_type)


main()