import argparse
import logging

import ldap3

from uncloud.hack.vm import VM
from uncloud.hack.config import Config
from uncloud.hack.mac import MAC
from uncloud.hack.net import VXLANBridge, DNSRA

from uncloud import UncloudException

arg_parser = argparse.ArgumentParser('hack', add_help=False)
                                     #description="Commands that are unfinished - use at own risk")
arg_parser.add_argument('--last-used-mac', action='store_true')
arg_parser.add_argument('--get-new-mac', action='store_true')

arg_parser.add_argument('--init-network', help="Initialise networking", action='store_true')
arg_parser.add_argument('--create-vxlan', help="Initialise networking", action='store_true')
arg_parser.add_argument('--network', help="/64 IPv6 network")
arg_parser.add_argument('--vxlan-uplink-device', help="The VXLAN underlay device, i.e. eth0")
arg_parser.add_argument('--vni', help="VXLAN ID (decimal)", type=int)
arg_parser.add_argument('--run-dns-ra', action='store_true',
                        help="Provide router advertisements and DNS resolution via dnsmasq")
arg_parser.add_argument('--use-sudo', help="Use sudo for command requiring root!", action='store_true')

arg_parser.add_argument('--create-vm', action='store_true')
arg_parser.add_argument('--destroy-vm', action='store_true')
arg_parser.add_argument('--get-vm-status', action='store_true')
arg_parser.add_argument('--get-vm-vnc', action='store_true')
arg_parser.add_argument('--list-vms', action='store_true')
arg_parser.add_argument('--memory', help="Size of memory (GB)", type=int, default=2)
arg_parser.add_argument('--cores', help="Amount of CPU cores", type=int, default=1)
arg_parser.add_argument('--image', help="Path (under hackprefix) to OS image")

arg_parser.add_argument('--image-format', help="Image format: qcow2 or raw", choices=['raw', 'qcow2'])
arg_parser.add_argument('--uuid', help="VM UUID")

arg_parser.add_argument('--no-db', help="Disable connection to etcd. For local testing only!", action='store_true')
arg_parser.add_argument('--hackprefix', help="hackprefix, if you need it you know it (it's where the iso is located and ifup/down.sh")

# order based commands => later to be shifted below "order"
arg_parser.add_argument('--order', action='store_true')
arg_parser.add_argument('--product', choices=["dualstack-vm"])
arg_parser.add_argument('--os-image-name', help="Name of OS image (successor to --image)")
arg_parser.add_argument('--os-image-size', help="Size of OS image in GB", type=int, default=10)

arg_parser.add_argument('--username')
arg_parser.add_argument('--password')


log = logging.getLogger(__name__)

def authenticate(username, password, totp_token=None):
    server = ldap3.Server("ldaps://ldap1.ungleich.ch")
    dn = "uid={},ou=customer,dc=ungleich,dc=ch".format(username)

    try:
        conn = ldap3.Connection(server, dn, password, auto_bind=True)
    except ldap3.core.exceptions.LDAPBindError as e:
        raise UncloudException("Credentials not verified by LDAP server: {}".format(e))



def order(config):
    for required_arg in [ 'product', 'username', 'password' ]:
        if not config.arguments[required_arg]:
            raise UncloudException("Missing required argument: {}".format(required_arg))

    if config.arguments['product'] == 'dualstack-vm':
        for required_arg in [ 'cores', 'memory', 'os_image_name', 'os_image_size' ]:
            if not config.arguments[required_arg]:
                raise UncloudException("Missing required argument: {}".format(required_arg))

        print(config.arguments)
        authenticate(config.arguments['username'], config.arguments['password'])

        # create DB entry for VM
        vm = VM(config)
        vm.schedule()



def main(arguments):
    config = Config(arguments)

    if arguments['order']:
        order(config)

    if arguments['create_vm']:
        vm = VM(config)
        vm.create()

    if arguments['destroy_vm']:
        vm = VM(config)
        vm.stop()

    if arguments['get_vm_status']:
        vm = VM(config)
        vm.status()

    if arguments['get_vm_vnc']:
        vm = VM(config)
        vm.vnc_addr()

    if arguments['list_vms']:
        vm = VM(config)
        vm.list()

    if arguments['last_used_mac']:
        m = MAC(config)
        print(m.last_used_mac())

    if arguments['get_new_mac']:
        print(MAC(config).get_next())

    #if arguments['init_network']:
    if arguments['create_vxlan']:
        if not arguments['network'] or not arguments['vni'] or not arguments['vxlan_uplink_device']:
            raise UncloudException("Initialising the network requires an IPv6 network and a VNI. You can use fd00::/64 and vni=1 for testing (non production!)")
        vb = VXLANBridge(vni=arguments['vni'],
                         route=arguments['network'],
                         uplinkdev=arguments['vxlan_uplink_device'],
                         use_sudo=arguments['use_sudo'])
        vb._setup_vxlan()
        vb._setup_bridge()
        vb._add_vxlan_to_bridge()
        vb._route_network()

    if arguments['run_dns_ra']:
        if not arguments['network'] or not arguments['vni']:
            raise UncloudException("Providing DNS/RAs requires a /64 IPv6 network and a VNI. You can use fd00::/64 and vni=1 for testing (non production!)")

        dnsra = DNSRA(route=arguments['network'],
                      vni=arguments['vni'],
                      use_sudo=arguments['use_sudo'])
        dnsra._setup_dnsmasq()