#!/usr/bin/env python

# from switch_calc_headers import *
from scapy.all import *
from nf_sim_tools import *
from collections import OrderedDict
import sss_sdnet_tuples

########################
# pkt generation tools #
########################

pktsApplied = []
pktsExpected = []

# Pkt lists for SUME simulations
nf_applied = OrderedDict()
nf_applied[0] = []
nf_applied[1] = []
nf_applied[2] = []
nf_applied[3] = []
nf_expected = OrderedDict()
nf_expected[0] = []
nf_expected[1] = []
nf_expected[2] = []
nf_expected[3] = []

nf_port_map = {
    "nf0":0b00000001,
    "nf1":0b00000100,
    "nf2":0b00010000,
    "nf3":0b01000000,
    "dma0":0b00000010
}

nf_id_map = {
    "nf0":0,
    "nf1":1,
    "nf2":2,
    "nf3":3
}

sss_sdnet_tuples.clear_tuple_files()

def applyPkt(pkt, ingress, time):
    print("Applying pkt on {} at {}: ".format(ingress, time))
    pktsApplied.append(pkt)
    sss_sdnet_tuples.sume_tuple_in['src_port'] = nf_port_map[ingress]
    sss_sdnet_tuples.sume_tuple_expect['src_port'] = nf_port_map[ingress]
    pkt.time = time
    nf_applied[nf_id_map[ingress]].append(pkt)

def expPkt(pkt, egress):
    pktsExpected.append(pkt)
    sss_sdnet_tuples.sume_tuple_expect['dst_port'] = nf_port_map[egress]
    sss_sdnet_tuples.write_tuples()
    if egress in ["nf0","nf1","nf2","nf3"]:
        nf_expected[nf_id_map[egress]].append(pkt)
    elif egress == 'bcast':
        nf_expected[0].append(pkt)
        nf_expected[1].append(pkt)
        nf_expected[2].append(pkt)
        nf_expected[3].append(pkt)

def print_summary(pkts):
    for pkt in pkts:
        print "summary = ", pkt.summary()

def write_pcap_files():
    wrpcap("src.pcap", pktsApplied)
    wrpcap("dst.pcap", pktsExpected)

    for i in nf_applied.keys():
        if (len(nf_applied[i]) > 0):
            wrpcap('nf{0}_applied.pcap'.format(i), nf_applied[i])

    for i in nf_expected.keys():
        if (len(nf_expected[i]) > 0):
            wrpcap('nf{0}_expected.pcap'.format(i), nf_expected[i])

    # i = 0..3
    for i in nf_applied.keys():
        print "nf{0}_applied times: ".format(i), [p.time for p in nf_applied[i]]

#####################
# generate testdata #
#####################

MAC1 = "08:11:11:11:11:08"
MAC2 = "08:22:22:22:22:08"
pktCnt = 0

INDEX_WIDTH = 4
REG_DEPTH = 2**INDEX_WIDTH

# Not sure what this is used for
NUM_KEYS = 4
lookup_table = {
    0: 0x00000001,
    1: 0x00000010,
    2: 0x00000100,
    3: 0x00001000
}

def test_nat64():
    """ packets for a certain mac always go to nf0 """
    pkgCnt = 1


    # From v4 to v6
    e4 = Ether(dst=MAC2, src=MAC1)
    i4 = IP(src = "10.0.0.42", dst = "10.0.0.66")
    u4 = UDP(sport=5000, dport=2345)
    p4 = 500 * "A"
    pkg4 = e4 / i4 / u4 / p4

    applyPkt(pkg4, "nf2", pkgCnt)

    e6 = e4
    i6 = IPv6(src = "2001:db8:42::a00:2a", dst = "2001:db8:42::42")
    u6 = u4
    p6 = p4
    pkg6 = e6 / i6 / u6 / p6

    expPkt(pkg6,   'nf3')

    pkgCnt += 1

    # From v6 to v4
    e6 = Ether(dst=MAC1, src=MAC2)
    i6 = IPv6(dst = "2001:db8:42::a00:2a", src = "2001:db8:42::42")
    u6 = UDP(dport=5000, sport=2345)
    p6 = 500 * "A"
    pkg6 = e6 / i6 / u6 / p6

    e4 = e6
    i4 = IP(dst = "10.0.0.42", src = "10.0.0.66", id=0)
    u4 = u6
    p4 = p6
    pkg4 = e4 / i4 / u4 / p4

    applyPkt(pkg6, "nf3", pkgCnt)
    expPkt(pkg4,   'nf2')


test_nat64()
write_pcap_files()