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#include <stdio.h>

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

namespace ot {
namespace Nexus {

/**
 * Time to advance for a node to form a network and become leader.
 */
static constexpr uint32_t kFormNetworkTime = 13 * 1000;

/**
 * Time to advance for a node to join as a child and upgrade to a router.
 * This duration accounts for MLE attach process and ROUTER_SELECTION_JITTER.
 */
static constexpr uint32_t kAttachToRouterTime = 200 * 1000;

/**
 * Time to advance for a node to join as a child.
 */
static constexpr uint32_t kAttachAsChildTime = 10 * 1000;

/**
 * Default noise floor used for RSSI calculations.
 */
static constexpr int8_t kDefaultNoiseFloor = -100;

/**
 * Typical RSSI for link quality 2.
 */
static const int8_t kRssiQuality2 = GetTypicalRssForLinkQuality(kDefaultNoiseFloor, kLinkQuality2);

/**
 * Typical RSSI for link quality 3.
 */
static const int8_t kRssiQuality3 = GetTypicalRssForLinkQuality(kDefaultNoiseFloor, kLinkQuality3);

void Test5_1_11(void)
{
    /**
     * 5.1.11 Attaching to a REED with better link quality
     *
     * 5.1.11.1 Topology
     * - Leader
     * - REED_1
     * - Router_2
     * - Router_1 (DUT)
     *
     * 5.1.11.2 Purpose & Description
     * The purpose of this test case is to validate that DUT will attach to a REED with the highest link quality,
     * when routers with the highest link quality are not available.
     *
     * Spec Reference   | V1.1 Section | V1.3.0 Section
     * -----------------|--------------|---------------
     * Parent Selection | 4.7.2        | 4.5.2
     */

    Core nexus;

    Node &leader  = nexus.CreateNode();
    Node &reed1   = nexus.CreateNode();
    Node &router2 = nexus.CreateNode();
    Node &dut     = nexus.CreateNode();

    leader.SetName("LEADER");
    reed1.SetName("REED_1");
    router2.SetName("ROUTER_2");
    dut.SetName("DUT");

    nexus.AdvanceTime(0);

    AllowLinkBetween(leader, reed1);
    AllowLinkBetween(leader, router2);
    AllowLinkBetween(reed1, dut);
    AllowLinkBetween(router2, dut);
    AllowLinkBetween(reed1, router2);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 1: Leader, REED_1, Router_2");

    /**
     * Step 1: Leader, REED_1, Router_2
     * - Description: Setup the topology without the DUT. Verify Leader and Router_2 are sending MLE
     *   Advertisements.
     * - Pass Criteria: N/A
     */
    leader.Form();
    nexus.AdvanceTime(kFormNetworkTime);
    VerifyOrQuit(leader.Get<Mle::Mle>().IsLeader());

    reed1.Get<Mle::Mle>().SetRouterUpgradeThreshold(0);
    reed1.Join(leader);
    nexus.AdvanceTime(kAttachAsChildTime);
    VerifyOrQuit(reed1.Get<Mle::Mle>().IsChild());

    router2.Join(leader);
    nexus.AdvanceTime(kAttachToRouterTime);
    VerifyOrQuit(router2.Get<Mle::Mle>().IsRouter());

    Log("---------------------------------------------------------------------------------------");
    Log("Step 2: Test Harness");

    /**
     * Step 2: Test Harness
     * - Description: Harness configures the RSSI between Router_2 & Router_1 (DUT) to enable a link quality of 2
     *   (medium).
     * - Pass Criteria: N/A
     */
    SuccessOrQuit(dut.Get<Mac::Filter>().AddRssIn(router2.Get<Mac::Mac>().GetExtAddress(), kRssiQuality2));
    SuccessOrQuit(router2.Get<Mac::Filter>().AddRssIn(dut.Get<Mac::Mac>().GetExtAddress(), kRssiQuality2));

    SuccessOrQuit(dut.Get<Mac::Filter>().AddRssIn(reed1.Get<Mac::Mac>().GetExtAddress(), kRssiQuality3));
    SuccessOrQuit(reed1.Get<Mac::Filter>().AddRssIn(dut.Get<Mac::Mac>().GetExtAddress(), kRssiQuality3));

    Log("---------------------------------------------------------------------------------------");
    Log("Step 3: Router_1 (DUT)");

    /**
     * Step 3: Router_1 (DUT)
     * - Description: Automatically sends a MLE Parent Request.
     * - Pass Criteria:
     *   - The DUT MUST send MLE Parent Request to the Link-Local All-Routers multicast address (FF02::2) with an IP
     *     Hop Limit of 255.
     *   - The following TLVs MUST be present in the MLE Parent Request:
     *     - Challenge TLV
     *     - Mode TLV
     *     - Scan Mask TLV = 0x80 (active Routers)
     *     - Version TLV
     */
    dut.Join(leader, Node::kAsFed);

    Log("---------------------------------------------------------------------------------------");
    Log("Step 4: Router_2");

    /**
     * Step 4: Router_2
     * - Description: Automatically responds to DUT with MLE Parent Response.
     * - Pass Criteria: N/A
     */

    Log("---------------------------------------------------------------------------------------");
    Log("Step 5: Router_1 (DUT)");

    /**
     * Step 5: Router_1 (DUT)
     * - Description: Automatically sends another MLE Parent Request - to Routers and REEDs - when it doesn’t see the
     *   highest link quality in Router_2’s response.
     * - Pass Criteria:
     *   - The DUT MUST send MLE Parent Request with the Scan Mask set to All Routers and REEDs.
     *   - The following TLVs MUST be present in the MLE Parent Request:
     *     - Challenge TLV
     *     - Mode TLV
     *     - Scan Mask TLV = 0xC0 (Routers and REEDs)
     *     - Version TLV
     */

    Log("---------------------------------------------------------------------------------------");
    Log("Step 6: Router_1 (DUT)");

    /**
     * Step 6: Router_1 (DUT)
     * - Description: Automatically sends MLE Child ID Request to REED_1 due to its better link quality.
     * - Pass Criteria:
     *   - The DUT MUST unicast MLE Child ID Request to REED_1, including the following TLVs:
     *     - Link-layer Frame Counter TLV
     *     - Mode TLV
     *     - Response TLV
     *     - Timeout TLV
     *     - TLV Request TLV
     *     - Version TLV
     *     - MLE Frame Counter TLV (optional)
     *   - The following TLV MUST NOT be present in the Child ID Request:
     *     - Address Registration TLV
     */
    nexus.AdvanceTime(kAttachAsChildTime);
    VerifyOrQuit(dut.Get<Mle::Mle>().IsChild());
    VerifyOrQuit(dut.Get<Mle::Mle>().GetParent().GetExtAddress() == reed1.Get<Mac::Mac>().GetExtAddress());

    nexus.SaveTestInfo("test_1_1_5_1_11.json");
}

} // namespace Nexus
} // namespace ot

int main(void)
{
    ot::Nexus::Test5_1_11();
    printf("All tests passed\n");
    return 0;
}