import configparser
from os.path import expanduser

# import os
# import libcloud.security

import time
from libcloud.compute.providers import get_driver
from libcloud.compute.types import Provider, NodeState

home = expanduser("~")

# reqs:
#   services: EC2 (nova, glance, neutron)
#   resources: 2 instances (m1.small), 2 elastic ips (1 keypair, 2 security groups)


# default region
# region_name = 'eu-central-1'
# region_name = 'ap-south-1'

# AWS Educate only allows us-east-1 see our AWS classroom at https://www.awseducate.com
# e.g., https://www.awseducate.com/student/s/launch-classroom?classroomId=a1v3m000005mNm6AAE

region_name = 'us-east-1'


def main():
    ###########################################################################
    #
    # get credentials
    #
    ###########################################################################

    # see AWS Academy Lab for Account Details
    # read credentials from file
    config = configparser.ConfigParser()
    config.read_file(open(home + '/.aws/credentials'))
    aws_access_key_id = config['default']['aws_access_key_id']
    aws_secret_access_key = config['default']['aws_secret_access_key']
    aws_session_token = config['default']['aws_session_token']

    # aws_access_key_id = "ASIAX..."
    # aws_secret_access_key = "eGwE12j..."
    # aws_session_token = "FwoGZXIvYXdzEK///////////wEaDE..."


    ###########################################################################
    #
    # create connection
    #
    ###########################################################################

    provider = get_driver(Provider.EC2)
    conn = provider(aws_access_key_id,
                    aws_secret_access_key,
                    token=aws_session_token,
                    region=region_name)

    ###########################################################################
    #
    # clean up resources from previous demos
    #
    ###########################################################################

    # destroy running demo instances
    for instance in conn.list_nodes():
        if instance.name in ['all-in-one', 'app-worker-1', 'app-worker-2', 'app-worker-3', 'app-controller',
                             'app-services', 'app-api-1', 'app-api-2']:
            if instance.state.value != 'terminated':
                print('Destroying Instance: %s' % instance.name)
                conn.destroy_node(instance)

    # wait until all nodes are destroyed to be able to remove depended security groups
    nodes_still_running = True
    while nodes_still_running:
        nodes_still_running = False
        time.sleep(3)
        instances = conn.list_nodes()
        for instance in instances:
            # if we see any demo instances still running continue to wait for them to stop
            if instance.name in ['all-in-one', 'app-worker-1', 'app-worker-2', 'app-worker-3', 'app-controller',
                                 'app-services', 'app-api-1', 'app-api-2']:
                if instance.state.value != 'terminated':
                    nodes_still_running = True
        print('There are still instances running, waiting for them to be destroyed...')

    # delete security groups
    for group in conn.ex_list_security_groups():
        # services depends on worker and api, so delete services first...
        if group in ['services']:
            print('Deleting security group: %s' % group)
            conn.ex_delete_security_group(group)

    for group in conn.ex_list_security_groups():
        # control depends on worker, so delete control before worker...
        if group in ['control']:
            print('Deleting security group: %s' % group)
            conn.ex_delete_security_group(group)

    for group in conn.ex_list_security_groups():
        if group in ['worker', 'api']:
            print('Deleting security group: %s' % group)
            conn.ex_delete_security_group(group)

    # release elastic ips
    for elastic_ip in conn.ex_describe_all_addresses():
        if elastic_ip.instance_id is None:
            print('Releasing unused elastic ip %s' % elastic_ip)
            conn.ex_release_address(elastic_ip, domain=elastic_ip.domain)


if __name__ == '__main__':
    main()