# Copyright (c) 2020 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Stream profile for T-rex traffic generator.

Stream profile:
 - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
 - Packet: ETH / IP / UDP
 - Direction 0 --> 1:
   - Source IP address range:      20.0.0.0 - 20.0.3.231
   - Destination IP address range: 12.0.0.2
   - Source UDP port range:        1024 - 1038
   - Destination UDP port range:   1024
 - Direction 1 --> 0:
   - Source IP address range:      12.0.0.2
   - Destination IP address range: 200.0.0.0
   - Source UDP port range:        1024
   - Destination UDP port range:   1024 - 16023
"""

from trex.stl.api import *
from profile_trex_stateless_base_class import TrafficStreamsBaseClass


class TrafficStreams(TrafficStreamsBaseClass):
    """Stream profile."""

    def __init__(self):
        """Initialization and setting of streams' parameters."""

        super(TrafficStreamsBaseClass, self).__init__()

        # IPs used in packet headers.
        self.p1_src_start_ip = u"20.0.0.0"
        self.p1_src_end_ip = u"20.0.3.231"
        self.p1_dst_start_ip = u"12.0.0.2"

        self.p2_src_start_ip = u"12.0.0.2"
        self.p2_src_end_ip = u"12.0.0.2"
        self.p2_dst_start_ip = u"200.0.0.0"

        # UDP ports used in packet headers.
        self.p1_src_start_udp_port = 1024
        self.p1_src_end_udp_port = 1038
        self.p1_dst_start_udp_port = 1024

        self.p2_src_start_udp_port = 1024
        self.p2_dst_start_udp_port = 1024
        self.p2_dst_end_udp_port = 16023

    def define_packets(self):
        """Defines the packets to be sent from the traffic generator.

        Packet definition: | ETH | IP | UDP |

        :returns: Packets to be sent from the traffic generator.
        :rtype: tuple
        """

        # Direction 0 --> 1
        base_pkt_a = (
                Ether() /
                IP(
                    src=self.p1_src_start_ip,
                    dst=self.p1_dst_start_ip,
                    proto=17
                ) /
                UDP(
                    sport=self.p1_src_start_udp_port,
                    dport=self.p1_dst_start_udp_port
                )
        )
        # Direction 1 --> 0
        base_pkt_b = (
                Ether() /
                IP(
                    src=self.p2_src_start_ip,
                    dst=self.p2_dst_start_ip,
                    proto=17
                ) /
                UDP(
                    sport=self.p2_src_start_udp_port,
                    dport=self.p2_dst_start_udp_port
                )
        )

        # Direction 0 --> 1
        vm1 = STLScVmRaw(
            [
                STLVmTupleGen(
                    ip_max=self.p1_src_end_ip,
                    port_min=self.p1_src_start_udp_port,
                    port_max=self.p1_src_end_udp_port,
                    name=u"tuple"
                ),
                STLVmWrFlowVar(
                    fv_name=u"tuple.ip",
                    pkt_offset=u"IP.src"
                ),
                STLVmFixIpv4(offset=u"IP"),
                STLVmWrFlowVuar(
                    fv_name=u"tuple.port",
                    pkt_offset=u"UDP.sport"
                )
            ]
        )
        # Direction 0 --> 1
        vm2 = STLScVmRaw(
            [
                STLVmFlowVar(
                    name=u"dport",
                    min_value=self.p2_dst_start_udp_port,
                    max_value=self.p2_dst_end_udp_port,
                    size=2,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"dport",
                    pkt_offset=u"UDP.dport"
                )
            ]
        )

        return base_pkt_a, base_pkt_b, vm1, vm2


def register():
    """Register this traffic profile to T-rex.

    Do not change this function.

    :return: Traffic streams.
    :rtype: Object
    """
    return TrafficStreams()