import ipaddress
##
import netaddr
from pyroute2 import IPRoute
##
from . import utils
from . import radvd


class IP(object):
    type = None
    version = None
    _ip = ipaddress.ip_address
    _net = ipaddress.ip_network
    _net_ip = netaddr.IPAddress
    _net_net = netaddr.IPNetwork

    def __init__(self, ip, prefix, *args, **kwargs):
        self.str = ip
        self.prefix = int(prefix)
        self.net_ip = self._net_ip(self.str)
        self.net_net = self._net_net('{0}/{1}'.format(self.str, self.prefix))

    def _ext_init(self):
        self.ip = self._ip(self.str)
        self.net = self._net('{0}/{1}'.format(self.str, self.prefix), strict = False)
        return(None)


class IP4(IP):
    type = 'IPv4'
    version = 4
    _ip = ipaddress.IPv4Address
    _net = ipaddress.IPv4Network

    def __init__(self, ip, prefix, *args, **kwargs):
        super().__init__(ip, prefix, *args, **kwargs)
        self._ext_init()


class IP6(IP):
    type = 'IPv6'
    version = 6
    _ip = ipaddress.IPv6Address
    _net = ipaddress.IPv6Network

    def __init__(self, ip, prefix, *args, **kwargs):
        super().__init__(ip, prefix, *args, **kwargs)
        self._ext_init()
        self.alloc_block = netaddr.SubnetSplitter(self.net_net)


class Assignment(object):
    def __init__(self, assign_xml, radvd = False, dns = False):
        self.xml = assign_xml
        self.do_radvd = radvd
        self.radvd_dns = dns
        self.iface = None
        self.iface_idx = None
        self.iface_addrs = []
        self.iface_blocks = []
        self.alloc = None  # This must be set externally to a mapped Allocation instance
        self.alloc_id = None
        self.prefix = None
        self.alloc_block = None
        self.parse()

    def _alloc(self):
        self.alloc_id = int(self.xml.attrib['alloc'].strip())
        return(None)

    def _iface(self):
        _iface_txt = self.xml.attrib['iface'].strip()
        self.iface = _iface_txt.strip()
        ipr = IPRoute()
        self.iface_idx = ipr.link_lookup(ifname = self.iface)[0]
        ipr.close()
        return(None)

    def _prefix(self):
        self.prefix = int(self.xml.attrib.get('prefix', 64).strip())
        return(None)

    def parse(self):
        self._iface()
        self._alloc()
        self._prefix()
        return(None)

    def parse_alloc(self):
        self.alloc_block = self.alloc.ip.alloc_block
        self.iface_blocks = self.alloc_block.extract_subnet(self.prefix, count = 1)
        for i in self.iface_blocks:
            self.iface_addrs.append(IP6(str(next(i.iter_hosts())), 128))
        return(None)


class Allocation(object):
    def __init__(self, alloc_net):
        _ip, _prefix = alloc_net.split('/')
        self.id = int(_prefix.strip())
        self.prefix = self.id
        self.ip = IP6(_ip.strip(), self.prefix)


class Tunnel(object):
    def __init__(self, tun_xml, he_tunnel, creds):
        self.xml = tun_xml
        self.creds = creds
        self.he = he_tunnel
        self.update_key = self.he.creds.password
        self.id = None
        self.client = None
        self.server = None
        self.endpoint = None
        self.radvd = None
        self.enable_radvd = None
        self.radvd_dns = None
        self.allocations = {}  # This is a dict of {}[alloc.id] = Allocation obj
        self.assignments = []  # This is a list of Assignment objs
        self.parse()

    def _allocations(self):
        self.allocations = self.he.allocations
        return(None)

    def _assignments(self):
        _assigns_xml = self.xml.find('assignments')
        self.enable_radvd = utils.xml2bool(_assigns_xml.attrib.get('radvd', 'false'))
        self.radvd_dns = utils.xml2bool(_assigns_xml.attrib.get('radvdDns', 'false'))
        for _assign_xml in _assigns_xml.findall('assign'):
            assign = Assignment(_assign_xml, radvd = self.enable_radvd, dns = self.radvd_dns)
            assign.alloc = self.allocations[assign.alloc_id]
            assign.parse_alloc()
            self.assignments.append(assign)
        return(None)

    def _client(self):
        self.client = self.he.client
        return(None)

    def _creds(self):
        self.creds_id = self.xml.attrib['creds'].strip()
        return(None)

    def _endpoint(self):
        self.endpoint = self.he.endpoint
        return(None)

    def _id(self):
        self.id = int(self.xml.attrib['id'].strip())
        return(None)

    def _radvd(self):
        self.radvd = radvd.RADVD()
        self.radvd.conf.generate(self.assignments)
        return(None)

    def _server(self):
        self.server = self.he.server
        return(None)

    def parse(self):
        self._id()
        self._creds()
        self._client()
        self._server()
        self._endpoint()
        self._allocations()
        self._assignments()
        self._radvd()
        return(None)