#!/usr/bin/env python
# SPDX-License-Identifier: ISC

#
# test_high_ecmp.py
#
# Copyright (c) 2024 by
# Nvidia Corporation
# Donald Sharp
#
# Copyright (c) 2025 by Soumya Roy, <souroy@nvidia.com>

"""
test_high_ecmp.py: Testing two routers with 256 interfaces and BGP setup
                   on it.

"""

import os
import re
import sys
import pytest
import json

pytestmark = [pytest.mark.bgpd]

# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))

# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger

# Required to instantiate the topology builder class.

#####################################################
##
##   Network Topology Definition
##
#####################################################


def build_topo(tgen):
    tgen.add_router("r1")
    tgen.add_router("r2")

    r1 = tgen.gears["r1"]
    r2 = tgen.gears["r2"]

    # Let's create 257 interfaces between the two switches
    for switch in range(1, 516):
        switch = tgen.add_switch("sw{}".format(switch))
        switch.add_link(r1)
        switch.add_link(r2)


#####################################################
##
##   Tests starting
##
#####################################################


def setup_module(module):
    "Setup topology"
    tgen = Topogen(build_topo, module.__name__)
    tgen.start_topology()

    # This is a sample of configuration loading.
    router_list = tgen.routers()
    for rname, router in router_list.items():
        router.load_frr_config(
            os.path.join(CWD, "{}/frr.conf".format(rname)),
            [
                (TopoRouter.RD_ZEBRA, "-s 180000000"),
                (TopoRouter.RD_BGP, None),
                (TopoRouter.RD_SHARP, None),
                (TopoRouter.RD_STATIC, None),
                (TopoRouter.RD_OSPF, None),
                (TopoRouter.RD_OSPF6, None),
                (TopoRouter.RD_PIM, None),
            ],
        )

    tgen.start_router()

    for rname, router in router_list.items():
        router.cmd("vtysh -f {}/{}/frr_unnumbered_bgp.conf".format(CWD, rname))


def teardown_module(_mod):
    "Teardown the pytest environment"
    tgen = get_topogen()

    # This function tears down the whole topology.
    tgen.stop_topology()


def test_nothing():
    "Do Nothing"
    tgen = get_topogen()
    # Don't run this test if we have any failure.
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)


if __name__ == "__main__":
    args = ["-s"] + sys.argv[1:]
    sys.exit(pytest.main(args))
