#
# This file is part of LiteEth.
#
# Copyright (c) 2015-2018 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause

import unittest

from migen import *

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

from liteeth.common import *
from liteeth.core import LiteEthUDPIPCore
from liteeth.frontend.etherbone import LiteEthEtherbone

from test.model import phy, mac, arp, ip, udp, etherbone

from litex.gen.sim import *

ip_address = 0x12345678
mac_address = 0x12345678abcd


class DUT(Module):
    def __init__(self):
        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=False)
        self.submodules.etherbone_model = etherbone.Etherbone(self.udp_model, debug=False)

        self.submodules.core = LiteEthUDPIPCore(self.phy_model, mac_address, ip_address, 100000)
        self.submodules.etherbone = LiteEthEtherbone(self.core.udp, 0x1234)

        self.submodules.sram = wishbone.SRAM(1024)
        self.submodules.interconnect = wishbone.InterconnectPointToPoint(self.etherbone.wishbone.bus, self.sram.bus)


def main_generator(dut):
    test_probe  = True
    test_writes = True
    test_reads  = True

    # test probe
    if test_probe:
        packet = etherbone.EtherbonePacket()
        packet.pf = 1
        dut.etherbone_model.send(packet)
        yield from dut.etherbone_model.receive()
        print("probe: " + str(bool(dut.etherbone_model.rx_packet.pr)))

    for i in range(2):
        # test writes
        if test_writes:
            writes_datas = [j for j in range(4)]
            writes = etherbone.EtherboneWrites(base_addr=0x1000, datas=writes_datas)
            record = etherbone.EtherboneRecord()
            record.writes      = writes
            record.reads       = None
            record.bca         = 0
            record.rca         = 0
            record.rff         = 0
            record.cyc         = 0
            record.wca         = 0
            record.wff         = 0
            record.byte_enable = 0xf
            record.wcount      = len(writes_datas)
            record.rcount      = 0

            packet = etherbone.EtherbonePacket()
            packet.records = [record]
            dut.etherbone_model.send(packet)
            for i in range(256):
                yield

        # test reads
        if test_reads:
            reads_addrs = [0x1000 + 4*j for j in range(4)]
            reads = etherbone.EtherboneReads(base_ret_addr=0x1000, addrs=reads_addrs)
            record = etherbone.EtherboneRecord()
            record.writes      = None
            record.reads       = reads
            record.bca         = 0
            record.rca         = 0
            record.rff         = 0
            record.cyc         = 0
            record.wca         = 0
            record.wff         = 0
            record.byte_enable = 0xf
            record.wcount      = 0
            record.rcount      = len(reads_addrs)

            packet = etherbone.EtherbonePacket()
            packet.records = [record]
            dut.etherbone_model.send(packet)
            yield from dut.etherbone_model.receive()
            loopback_writes_datas = []
            loopback_writes_datas = dut.etherbone_model.rx_packet.records.pop().writes.get_datas()

            # check resultss
            s, l, e = check(writes_datas, loopback_writes_datas)
            print("shift " + str(s) + " / length " + str(l) + " / errors " + str(e))


class TestEtherbone(unittest.TestCase):
    def test_etherbone(self):
        dut = DUT()
        generators = {
            "sys" :   [main_generator(dut)],
            "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") # FIXME: hanging