"""
Unit tests for testing with a CORE switch.
"""
from core.api import coreapi, dataconversion
from core.api.coreapi import CoreExecuteTlv
from core.enumerations import CORE_API_PORT, EventTypes, EventTlvs, MessageFlags, LinkTlvs, LinkTypes, ExecuteTlvs, \
    MessageTypes
from core.misc import ipaddress
from core.netns.nodes import SwitchNode, CoreNode


def cmd(node, exec_cmd):
    """
    Convenience method for sending commands to a node using the legacy API.

    :param node: The node the command should be issued too
    :param exec_cmd: A string with the command to be run
    :return: Returns the result of the command
    """
    # Set up the command api message
    tlv_data = CoreExecuteTlv.pack(ExecuteTlvs.NODE.value, node.objid)
    tlv_data += CoreExecuteTlv.pack(ExecuteTlvs.NUMBER.value, 1)
    tlv_data += CoreExecuteTlv.pack(ExecuteTlvs.COMMAND.value, exec_cmd)
    message = coreapi.CoreExecMessage.pack(MessageFlags.STRING.value | MessageFlags.TEXT.value, tlv_data)
    node.session.broker.handlerawmsg(message)

    # Now wait for the response
    server = node.session.broker.servers["localhost"]
    server.sock.settimeout(50.0)

    # receive messages until we get our execute response
    result = None
    while True:
        message_header = server.sock.recv(coreapi.CoreMessage.header_len)
        message_type, message_flags, message_length = coreapi.CoreMessage.unpack_header(message_header)
        message_data = server.sock.recv(message_length)

        # If we get the right response return the results
        print "received response message: %s" % MessageTypes(message_type)
        if message_type == MessageTypes.EXECUTE.value:
            message = coreapi.CoreExecMessage(message_flags, message_header, message_data)
            result = message.get_tlv(ExecuteTlvs.RESULT.value)
            break

    return result


class TestGui:
    def test_broker(self, core):
        """
        Test session broker creation.

        :param conftest.Core core: core fixture to test with
        """

        prefix = ipaddress.Ipv4Prefix("10.83.0.0/16")
        daemon = "localhost"

        # add server
        core.session.broker.addserver(daemon, "127.0.0.1", CORE_API_PORT)

        # setup server
        core.session.broker.setupserver(daemon)

        # do not want the recvloop running as we will deal ourselves
        core.session.broker.dorecvloop = False

        # have broker handle a configuration state change
        core.session.set_state(EventTypes.CONFIGURATION_STATE.value)
        tlv_data = coreapi.CoreEventTlv.pack(EventTlvs.TYPE.value, EventTypes.CONFIGURATION_STATE.value)
        raw_event_message = coreapi.CoreEventMessage.pack(0, tlv_data)
        core.session.broker.handlerawmsg(raw_event_message)

        # create a switch node
        switch = core.session.add_object(cls=SwitchNode, name="switch", start=False)
        switch.setposition(x=80, y=50)
        switch.server = daemon

        # retrieve switch data representation, create a switch message for broker to handle
        switch_data = switch.data(MessageFlags.ADD.value)
        switch_message = dataconversion.convert_node(switch_data)
        core.session.broker.handlerawmsg(switch_message)

        # create node one
        core.create_node("n1")
        node_one = core.get_node("n1")
        node_one.server = daemon

        # create node two
        core.create_node("n2")
        node_two = core.get_node("n2")
        node_two.server = daemon

        # create node messages for the broker to handle
        for node in [node_one, node_two]:
            node_data = node.data(MessageFlags.ADD.value)
            node_message = dataconversion.convert_node(node_data)
            core.session.broker.handlerawmsg(node_message)

        # create links to switch from nodes for broker to handle
        for index, node in enumerate([node_one, node_two], start=1):
            tlv_data = coreapi.CoreLinkTlv.pack(LinkTlvs.N1_NUMBER.value, switch.objid)
            tlv_data += coreapi.CoreLinkTlv.pack(LinkTlvs.N2_NUMBER.value, node.objid)
            tlv_data += coreapi.CoreLinkTlv.pack(LinkTlvs.TYPE.value, LinkTypes.WIRED.value)
            tlv_data += coreapi.CoreLinkTlv.pack(LinkTlvs.INTERFACE2_NUMBER.value, 0)
            ip4_address = prefix.addr(index)
            tlv_data += coreapi.CoreLinkTlv.pack(LinkTlvs.INTERFACE2_IP4.value, ip4_address)
            tlv_data += coreapi.CoreLinkTlv.pack(LinkTlvs.INTERFACE2_IP4_MASK.value, prefix.prefixlen)
            raw_link_message = coreapi.CoreLinkMessage.pack(MessageFlags.ADD.value, tlv_data)
            core.session.broker.handlerawmsg(raw_link_message)

        # change session to instantiation state
        tlv_data = coreapi.CoreEventTlv.pack(EventTlvs.TYPE.value, EventTypes.INSTANTIATION_STATE.value)
        raw_event_message = coreapi.CoreEventMessage.pack(0, tlv_data)
        core.session.broker.handlerawmsg(raw_event_message)

        # Get the ip or last node and ping it from the first
        print "pinging from the first to the last node"
        pingip = cmd(node_one, "ip -4 -o addr show dev eth0").split()[3].split("/")[0]
        print cmd(node_two, "ping -c 5 " + pingip)