import subprocess
import ipaddress

from uncloud import UncloudException


class VXLANBridge(object):
    cmd_create_vxlan = "ip -6 link add {vxlandev} type vxlan id {vni_dec} dstport 4789 group {multicast_address} dev {uplinkdev} ttl 5"
    cmd_up_dev = "ip link set {dev} up"
    cmd_create_bridge="ip link add {bridgedev} type bridge"
    cmd_add_to_bridge="ip link set {vxlandev} master {bridgedev} up"
    cmd_add_addr="ip addr add {ip} dev {bridgedev}"

    # VXLAN ids are at maximum 24 bit - use a /104
    multicast_network = ipaddress.IPv6Network("ff05::/104")
    max_vni = (2**24)-1

    def __init__(self,
                 vni,
                 uplinkdev):
        self.config = {}

        if vni > self.max_vni:
            raise UncloudException("VNI must be in the range of 0 .. {}".format(self.max_vni))

        self.config['vni_dec'] = vni
        self.config['vni_hex'] = "{:x}".format(vni)
        self.config['multicast_address'] = self.multicast_network[vni]

        self.config['uplinkdev'] = uplinkdev
        self.config['vxlandev'] = "vx{}".format(self.config['vni_hex'])
        self.config['bridgedev'] = "br{}".format(self.config['vni_hex'])


    def setup_networking(self):
        pass

    def _setup_vxlan(self):
        # check for device first (?)
        cmd = self.cmd_create_vxlan.format(**self.config)
        print(cmd)
        subprocess.run(cmd.split())

class ManagementBridge(VXLANBridge):
    pass


class DNSRA(object):
    def __init__(self):
        pass


class Firewall(object):
    pass