# Example for Cloud Computing Course Master AI / GSD
#
# uses libCloud: https://libcloud.apache.org/
# libCloud API documentation: https://libcloud.readthedocs.io/en/latest/
# OpenStack API documentation: https://developer.openstack.org/
# this code was initially based on the former tutorial: https://developer.openstack.org/firstapp-libcloud/

import getpass

from libcloud.compute.providers import get_driver
from libcloud.compute.types import Provider

# Please use 1-29 for X in the following variable to specify your group number. (will be used for the username,
# project etc., as coordinated in the lab sessions)

group_number = 30

########################################################################################################################
#
#  no changes necessary below this line
#
########################################################################################################################

# web service endpoint of the private cloud infrastructure
auth_url = 'https://private-cloud.informatik.hs-fulda.de:5000'
# your username in OpenStack
auth_username = 'CloudComp' + str(group_number)
# your project in OpenStack
project_name = 'CloudComp' + str(group_number)
# A network in the project the started instance will be attached to
project_network = 'CloudComp' + str(group_number) + '-net'

# The image to look for and use for the started instance
ubuntu_image_name = "Ubuntu 18.04 - Bionic Beaver - 64-bit - Cloud Based Image"

# default region
region_name = 'RegionOne'
# domain to use, "default" for local accounts, "hsfulda" for LDAP of DVZ, e.g., using fdaiXXXX as auth_username
domain_name = "default"


def main():
    # get the password from user
    auth_password = getpass.getpass("Enter your OpenStack password:")
    # auth_password = "demo"

    # instantiate a connection to the OpenStack private cloud
    # make sure to include ex_domain_name and ex_force_auth_version='3.x_password', as they are needed in our
    # environment
    provider = get_driver(Provider.OPENSTACK)

    print("Opening connection to %s as %s..." % (auth_url, auth_username))

    conn = provider(auth_username,
                    auth_password,
                    ex_force_auth_url=auth_url,
                    ex_force_auth_version='3.x_password',
                    ex_tenant_name=project_name,
                    ex_force_service_region=region_name,
                    ex_domain_name=domain_name)

    print("Getting images and selecting desired one...")
    print("=========================================================================")

    # get a list of images offered in the cloud context (e.g. Ubuntu 14.04, Ubuntu 16.04, cirros, ...)
    images = conn.list_images()
    image = ''
    for img in images:
        if img.name == ubuntu_image_name:
            image = img
            print(img)

    print("Getting flavors...")
    print("=========================================================================")

    # get a list of flavors offered in the cloud context (e.g. m1.small, m1.medium, ...)
    flavors = conn.list_sizes()
    for flavor in flavors:
        print(flavor)

    print("Selecting desired flavor...")
    print("=========================================================================")

    # get the flavor with id 2
    flavor_id = '2'
    flavor = conn.ex_get_size(flavor_id)
    print(flavor)

    print("Selecting desired network...")
    print("=========================================================================")

    # get a list of networks in the cloud context
    networks = conn.ex_list_networks()
    network = ''
    for net in networks:
        if net.name == project_network:
            network = net

    print("Create instance 'testing'...")
    print("=========================================================================")

    # create a new instance with the name "testing"
    # make sure to provide networks (networks={network}) the instance should be attached to
    instance_name = 'testing'
    testing_instance = conn.create_node(name=instance_name, image=image, size=flavor, networks={network})
    print(testing_instance)

    print("Showing all running instances...")
    print("=========================================================================")

    # show all instances (running nodes) in the cloud context
    instances = conn.list_nodes()
    for instance in instances:
        print(instance)

    print("Destroying instance...")
    print("=========================================================================")

    # destroy the instance we have just created
    conn.destroy_node(testing_instance)


# method that is called when the script is started from the command line
if __name__ == '__main__':
    main()