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#include <stdio.h>

#include "platform/nexus_core.hpp"
#include "platform/nexus_node.hpp"

namespace ot {
namespace Nexus {

void TestIPv6SourceSelection(void)
{
    /**
     * Test IPv6 Source Address Selection
     *
     * Purpose & Description:
     * This test verifies that the correct source IPv6 address is selected based on the destination address.
     */

    Core nexus;

    Node &leader = nexus.CreateNode();
    Node &router = nexus.CreateNode();

    leader.SetName("LEADER");
    router.SetName("ROUTER");

    AllowLinkBetween(leader, router);

    nexus.AdvanceTime(0);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 0: Form network");

    leader.Form();
    nexus.AdvanceTime(13 * 1000); // kFormNetworkTime
    VerifyOrQuit(leader.Get<Mle::Mle>().IsLeader());

    router.Join(leader);
    nexus.AdvanceTime(200 * 1000); // kAttachToRouterTime
    VerifyOrQuit(router.Get<Mle::Mle>().IsRouter());

    Ip6::Address leaderRloc      = leader.Get<Mle::Mle>().GetMeshLocalRloc();
    Ip6::Address leaderMleid     = leader.Get<Mle::Mle>().GetMeshLocalEid();
    Ip6::Address leaderLinkLocal = leader.Get<Mle::Mle>().GetLinkLocalAddress();
    Ip6::Address leaderAloc;
    leader.Get<Mle::Mle>().ComposeLeaderAloc(leaderAloc);

    Ip6::Address routerRloc      = router.Get<Mle::Mle>().GetMeshLocalRloc();
    Ip6::Address routerMleid     = router.Get<Mle::Mle>().GetMeshLocalEid();
    Ip6::Address routerLinkLocal = router.Get<Mle::Mle>().GetLinkLocalAddress();

    Log("---------------------------------------------------------------------------------------");
    Log("Step 1: RLOC source for RLOC destination");
    nexus.SendAndVerifyEchoRequest(router, routerRloc, leaderRloc, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 2: ML-EID source for ALOC destination");
    nexus.SendAndVerifyEchoRequest(router, routerMleid, leaderAloc, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 3: ML-EID source for ML-EID destination");
    nexus.SendAndVerifyEchoRequest(router, routerMleid, leaderMleid, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 4: Link-local source for Link-local destination");
    nexus.SendAndVerifyEchoRequest(router, routerLinkLocal, leaderLinkLocal, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 5: ML-EID source for Realm-local multicast destination");
    Ip6::Address multicastAddr;
    SuccessOrQuit(multicastAddr.FromString("ff03::1"));
    nexus.SendAndVerifyEchoRequest(router, routerMleid, multicastAddr, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 6: GUA source for GUA destination");

    NetworkData::OnMeshPrefixConfig config;
    config.Clear();
    SuccessOrQuit(config.GetPrefix().FromString("2001::/64"));
    config.mPreferred    = true;
    config.mSlaac        = true;
    config.mOnMesh       = true;
    config.mDefaultRoute = true;
    config.mStable       = true;

    SuccessOrQuit(leader.Get<NetworkData::Local>().AddOnMeshPrefix(config));
    leader.Get<NetworkData::Notifier>().HandleServerDataUpdated();
    nexus.AdvanceTime(10 * 1000);

    const Ip6::Address &leaderGua = leader.FindMatchingAddress("2001::/64");
    const Ip6::Address &routerGua = router.FindMatchingAddress("2001::/64");

    VerifyOrQuit(!leaderGua.IsUnspecified());
    VerifyOrQuit(!routerGua.IsUnspecified());

    nexus.SendAndVerifyEchoRequest(router, routerGua, leaderGua, 0, Ip6::kDefaultHopLimit, 1000, false);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 7: GUA source for external address (default route)");

    Ip6::Address externalAddr;
    SuccessOrQuit(externalAddr.FromString("2007::1"));

    // Add externalAddr to leader so it responds to pings
    otNetifAddress extNetifAddr;
    memset(&extNetifAddr, 0, sizeof(extNetifAddr));
    AsCoreType(&extNetifAddr.mAddress) = externalAddr;
    extNetifAddr.mPrefixLength         = 128;
    extNetifAddr.mPreferred            = true;
    extNetifAddr.mValid                = true;
    SuccessOrQuit(otIp6AddUnicastAddress(&leader.GetInstance(), &extNetifAddr));

    nexus.SendAndVerifyEchoRequest(router, routerGua, externalAddr, 0, Ip6::kDefaultHopLimit, 1000, false);

    nexus.SaveTestInfo("test_ipv6_source_selection.json");
}

} // namespace Nexus
} // namespace ot

int main(void)
{
    ot::Nexus::TestIPv6SourceSelection();
    printf("All tests passed\n");
    return 0;
}