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

Stream profile:
 - Three parallel bi-directional streams sent as W --> E and E --> W
   at the same time.
 - Packet: ETH / IP /
"""

from trex.stl.api import *
from profile_trex_stateless_scale_class import TrafficStreamsScaleClass


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

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

        super(TrafficStreamsScaleClass, self).__init__()

        self.pkt_data = [
            # Direction W --> E:
            {
                "src_start_ip": "10.0.0.1",
                "dst_start_ip": "20.0.0.0",
                "dst_end_ip": "20.0.39.15",
                "seed": 1
            },
            # Direction E --> W:
            {
                "src_start_ip": "20.0.0.1",
                "dst_start_ip": "10.0.0.0",
                "dst_end_ip": "10.0.39.15",
                "seed": 2
            }
        ]
        self.pkt_base = []
        self.pkt_vm = []

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

        Packet definition: | ETH | IP |

        :returns: Base packets to be sent and transformation function.
        :rtype: tuple
        """
        for i in range(len(self.pkt_data)):
            self.pkt_base.append(
                Ether() /
                IP(
                    src=self.pkt_data[i]["src_start_ip"],
                    dst=self.pkt_data[i]["dst_start_ip"],
                    proto=61
                )
            )
            self.pkt_vm.append(
                STLScVmRaw(
                    [
                        STLVmFlowVarRepeatableRandom(
                            name="dst",
                            min_value=self.pkt_data[i]["dst_start_ip"],
                            max_value=self.pkt_data[i]["dst_end_ip"],
                            size=4,
                            seed=self.pkt_data[i]["seed"],
                            limit=(2**24 - 1)
                        ),
                        STLVmWrFlowVar(
                            fv_name="dst",
                            pkt_offset="IP.dst"
                        ),
                        STLVmFixIpv4(
                            offset="IP"
                        )
                    ]
                )
            )

        return self.pkt_base, self.pkt_vm


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

    Do not change this function.

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