import getpass

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

# Please use 1-25 for X in username, project etc., as coordinated in the lab sessions

# web service endpoint of the private cloud infrastructure
auth_url = 'https://private-cloud2.informatik.hs-fulda.de:5000'
# your username in OpenStack
auth_username = 'CloudCompX'
# your project in OpenStack
project_name = 'CloudCompGrpX'

# 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"

ubuntu_image_name = "Ubuntu 14.04 - Trusty Tahr - 64-bit - Cloud Based Image"

flavor_name = 'm1.small'

network_name = "ai-netlab-pro-net"

keypair_name = 'srieger-pub'
pub_key_file = '~/.ssh/id_rsa.pub'


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

    if "OS_PASSWORD" in os.environ:
        auth_password = os.environ["OS_PASSWORD"]
    else:
        auth_password = getpass.getpass("Enter your OpenStack password:")
    # auth_password = "demo"

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

    provider = get_driver(Provider.OPENSTACK)
    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)

    ###########################################################################
    #
    # get image, flavor, network for instance creation
    #
    ###########################################################################
    images = conn.list_images()
    image = ''
    for img in images:
        if img.name == ubuntu_image_name:
            image = img

    flavors = conn.list_sizes()
    flavor = ''
    for flav in flavors:
        if flav.name == flavor_name:
            flavor = conn.ex_get_size(flav.id)

    networks = conn.ex_list_networks()
    network = ''
    for net in networks:
        if net.name == network_name:
            network = net

    ###########################################################################
    #
    # create keypair dependency
    #
    ###########################################################################

    print('Checking for existing SSH key pair...')
    keypair_exists = False
    for keypair in conn.list_key_pairs():
        if keypair.name == keypair_name:
            keypair_exists = True

    if keypair_exists:
        print('Keypair ' + keypair_name + ' already exists. Skipping import.')
    else:
        print('adding keypair...')
        conn.import_key_pair_from_file(keypair_name, pub_key_file)

    for keypair in conn.list_key_pairs():
        print(keypair)

    ###########################################################################
    #
    # create security group dependency
    #
    ###########################################################################

    print('Checking for existing security group...')
    security_group_name = 'all-in-one'
    security_group_exists = False
    all_in_one_security_group = ''
    for security_group in conn.ex_list_security_groups():
        if security_group.name == security_group_name:
            all_in_one_security_group = security_group
            security_group_exists = True

    if security_group_exists:
        print('Security Group ' + all_in_one_security_group.name + ' already exists. Skipping creation.')
    else:
        all_in_one_security_group = conn.ex_create_security_group(security_group_name,
                                                                  'network access for all-in-one application.')
        conn.ex_create_security_group_rule(all_in_one_security_group, 'TCP', 80, 80)
        conn.ex_create_security_group_rule(all_in_one_security_group, 'TCP', 22, 22)

    for security_group in conn.ex_list_security_groups():
        print(security_group)

    ###########################################################################
    #
    # create all-in-one instance
    #
    ###########################################################################

    userdata = '''#!/usr/bin/env bash
    curl -L -s https://git.openstack.org/cgit/openstack/faafo/plain/contrib/install.sh | bash -s -- \
        -i faafo -i messaging -r api -r worker -r demo
    '''

    print('Checking for existing instance...')
    instance_name = 'all-in-one'
    instance_exists = False
    testing_instance = ''
    for instance in conn.list_nodes():
        if instance.name == instance_name:
            testing_instance = instance
            instance_exists = True

    if instance_exists:
        print('Instance ' + testing_instance.name + ' already exists. Skipping creation.')
    else:
        print('Starting new all-in-one instance and wait until it is running...')
        testing_instance = conn.create_node(name=instance_name,
                                            image=image,
                                            size=flavor,
                                            networks=[network],
                                            ex_keyname=keypair_name,
                                            ex_userdata=userdata,
                                            ex_security_groups=[all_in_one_security_group])
        conn.wait_until_running(nodes=[testing_instance], timeout=120, ssh_interface='private_ips')

    ###########################################################################
    #
    # assign all-in-one instance floating ip
    #
    ###########################################################################

    private_ip = None
    if len(testing_instance.private_ips):
        private_ip = testing_instance.private_ips[0]
        print('Private IP found: {}'.format(private_ip))

    public_ip = None
    if len(testing_instance.public_ips):
        public_ip = testing_instance.public_ips[0]
        print('Public IP found: {}'.format(public_ip))

    print('Checking for unused Floating IP...')
    unused_floating_ip = None
    for floating_ip in conn.ex_list_floating_ips():
        if not floating_ip.node_id:
            unused_floating_ip = floating_ip
            break

    if not unused_floating_ip and len(conn.ex_list_floating_ip_pools()):
        pool = conn.ex_list_floating_ip_pools()[0]
        print('Allocating new Floating IP from pool: {}'.format(pool))
        unused_floating_ip = pool.create_floating_ip()

    if public_ip:
        print('Instance ' + testing_instance.name + ' already has a public ip. Skipping attachment.')
    elif unused_floating_ip:
        conn.ex_attach_floating_ip_to_node(testing_instance, unused_floating_ip)

    actual_ip_address = None
    if public_ip:
        actual_ip_address = public_ip
    elif unused_floating_ip:
        actual_ip_address = unused_floating_ip.ip_address
    elif private_ip:
        actual_ip_address = private_ip

    print('The Fractals app will be deployed to http://{}'.format(actual_ip_address))


if __name__ == '__main__':
    main()