import yaml
import netaddr
import os
import log as logging

LOG = logging.getLogger("net-recover")
config_path = os.path.join(os.path.dirname(__file__), "network.cfg")

def setup_bondings(bond_mappings):
    print bond_mappings

def add_ovs_port(ovs_br, ifname, uplink, vlan_id=None):
    LOG.info("add_ovs_port enter")
    cmd = "ovs-vsctl --may-exist add-port %s %s" % (ovs_br, ifname)
    if vlan_id:
        cmd += " tag=%s" % vlan_id
    cmd += " -- set Interface %s type=internal;" % ifname
    cmd += "ip link set dev %s address `ip link show %s |awk '/link\/ether/{print $2}'`;" \
            % (ifname, uplink)
    cmd += "ip link set %s up;" % ifname
    LOG.info("add_ovs_port: cmd=%s" % cmd)
    os.system(cmd)

def setup_ips(ip_settings, sys_intf_mappings):
    LOG.info("setup_ips enter")
    for intf_info in ip_settings.values():
        network = netaddr.IPNetwork(intf_info["cidr"])
        if sys_intf_mappings[intf_info["name"]]["type"] == "ovs":
            intf_name = intf_info["name"]
        else:
            intf_name = intf_info["alias"]
        if "gw" in intf_info:
            cmd = "ip addr add %s/%s brd %s dev %s;" \
                  % (intf_info["ip"], intf_info["netmask"], str(network.broadcast),intf_name)
            cmd += "route del default;"
            cmd += "ip route add default via %s dev %s" % (intf_info["gw"], intf_name)
        LOG.info("setup_ips: cmd=%s" % cmd)
        os.system(cmd)

def setup_intfs(sys_intf_mappings, uplink_map):
    LOG.info("setup_intfs enter")
    for intf_name, intf_info in sys_intf_mappings.items():
        if intf_info["type"] == "ovs":
            add_ovs_port(
                    intf_info["interface"],
                    intf_name,
                    uplink_map[intf_info["interface"]],
                    vlan_id=intf_info.get("vlan_tag"))
        else:
            pass

def main(config):
    uplink_map = {}
    setup_bondings(config["bond_mappings"])
    for provider_net in config["provider_net_mappings"]:
        uplink_map[provider_net['name']] = provider_net['interface']

    setup_intfs(config["sys_intf_mappings"], uplink_map)
    setup_ips(config["ip_settings"], config["sys_intf_mappings"])


if __name__ == "__main__":
    os.system("service openvswitch-switch status|| service openvswitch-switch start")
    config = yaml.load(open(config_path))
    main(config)