import unittest
from litex.gen import *

from litex.soc.interconnect import wishbone
from litex.soc.interconnect.stream_sim import *

from liteeth.common import *
from liteeth.core import LiteEthUDPIPCore

from model import phy, mac, arp, ip, udp

ip_address = 0x12345678
mac_address = 0x12345678abcd


class DUT(Module):
    def __init__(self, dw=8):
        self.dw = dw
        self.submodules.phy_model = phy.PHY(8, debug=False)
        self.submodules.mac_model = mac.MAC(self.phy_model, debug=False, loopback=False)
        self.submodules.arp_model = arp.ARP(self.mac_model, mac_address, ip_address, debug=False)
        self.submodules.ip_model = ip.IP(self.mac_model, mac_address, ip_address, debug=False, loopback=False)
        self.submodules.udp_model = udp.UDP(self.ip_model, ip_address, debug=False, loopback=True)

        self.submodules.core = LiteEthUDPIPCore(self.phy_model, mac_address, ip_address, 100000)
        udp_port = self.core.udp.crossbar.get_port(0x5678, dw)
        self.submodules.streamer = PacketStreamer(eth_udp_user_description(dw))
        self.submodules.logger = PacketLogger(eth_udp_user_description(dw))
        self.comb += [
            Record.connect(self.streamer.source, udp_port.sink),
            udp_port.sink.ip_address.eq(0x12345678),
            udp_port.sink.src_port.eq(0x1234),
            udp_port.sink.dst_port.eq(0x5678),
            udp_port.sink.length.eq(64//(dw//8)),
            Record.connect(udp_port.source, self.logger.sink)
        ]

def main_generator(dut):
    packet = Packet([i for i in range(64//(dut.dw//8))])
    dut.streamer.send(packet)
    yield from dut.logger.receive()

    # check results
    s, l, e = check(packet, dut.logger.packet)
    print("shift " + str(s) + " / length " + str(l) + " / errors " + str(e))

if __name__ == "__main__":
    dut = DUT(8)
    generators = {
        "sys" :   [main_generator(dut),
                   dut.streamer.generator(),
                   dut.logger.generator()],
        "eth_tx": [dut.phy_model.phy_sink.generator(),
                   dut.phy_model.generator()],
        "eth_rx":  dut.phy_model.phy_source.generator()
    }
    clocks = {"sys":    10,
              "eth_rx": 10,
              "eth_tx": 10}
    run_simulation(dut, generators, clocks, vcd_name="sim.vcd")