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#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <openthread/border_agent.h>
#include <openthread/dataset.h>
#include <openthread/dataset_ftd.h>
#include <openthread/instance.h>
#include <openthread/ip6.h>
#include <openthread/thread.h>
#include <openthread/platform/time.h>
#include "gmock/gmock.h"

#include "instance/instance.hpp"

#include "fake_platform.hpp"
#include "mock_callback.hpp"

using namespace ot;
using ::testing::AnyNumber;
using ::testing::AtLeast;
using ::testing::Truly;

TEST(otDatasetSetActiveTlvs, shouldTriggerStateCallbackOnSuccess)
{
    FakePlatform fakePlatform;

    typedef MockCallback<void, otChangedFlags> MockStateCallback;

    MockStateCallback mockStateCallback;

    EXPECT_CALL(mockStateCallback, Call).Times(AnyNumber());

    EXPECT_CALL(mockStateCallback, Call(Truly([](otChangedFlags aChangedFlags) -> bool {
                    return (aChangedFlags & OT_CHANGED_ACTIVE_DATASET);
                })))
        .Times(AtLeast(1));

    otError error = otSetStateChangedCallback(FakePlatform::CurrentInstance(), MockStateCallback::CallWithContext,
                                              &mockStateCallback);
    assert(error == OT_ERROR_NONE);

    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    error = otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset);
    assert(error == OT_ERROR_NONE);

    otDatasetConvertToTlvs(&dataset, &datasetTlvs);
    error = otDatasetSetActiveTlvs(FakePlatform::CurrentInstance(), &datasetTlvs);
    assert(error == OT_ERROR_NONE);

    fakePlatform.GoInMs(10000);
}

TEST(otDatasetIsValid, shouldReturnTrueForValidActiveDataset)
{
    FakePlatform             fakePlatform;
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);
    otDatasetConvertToTlvs(&dataset, &datasetTlvs);

    EXPECT_TRUE(otDatasetIsValid(&datasetTlvs, true));
}

TEST(otDatasetIsValid, shouldReturnFalseForIncompleteActiveDataset)
{
    FakePlatform             fakePlatform;
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);

    // Remove a required field, e.g., Network Key
    dataset.mComponents.mIsNetworkKeyPresent = false;

    otDatasetConvertToTlvs(&dataset, &datasetTlvs);

    EXPECT_FALSE(otDatasetIsValid(&datasetTlvs, true));
}

TEST(otDatasetIsValid, shouldReturnFalseForDuplicatedTlvs)
{
    FakePlatform             fakePlatform;
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);
    otDatasetConvertToTlvs(&dataset, &datasetTlvs);

    // Duplicate a TLV (e.g. Network Name TLV)
    // TLV format: Type (1 byte), Length (1 byte), Value (n bytes)
    datasetTlvs.mTlvs[datasetTlvs.mLength]     = OT_MESHCOP_TLV_NETWORKNAME; // Type: Network Name
    datasetTlvs.mTlvs[datasetTlvs.mLength + 1] = 1;                          // Length: 1
    datasetTlvs.mTlvs[datasetTlvs.mLength + 2] = 'A';
    datasetTlvs.mLength += 3;

    EXPECT_FALSE(otDatasetIsValid(&datasetTlvs, true));
}

TEST(otDatasetIsValid, shouldReturnTrueForValidPendingDataset)
{
    FakePlatform             fakePlatform;
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);

    // Pending Dataset MUST contain Pending Timestamp and Delay Timer.
    dataset.mPendingTimestamp.mSeconds             = 100;
    dataset.mPendingTimestamp.mTicks               = 0;
    dataset.mComponents.mIsPendingTimestampPresent = true;
    dataset.mDelay                                 = 30000;
    dataset.mComponents.mIsDelayPresent            = true;

    otDatasetConvertToTlvs(&dataset, &datasetTlvs);

    EXPECT_TRUE(otDatasetIsValid(&datasetTlvs, false));
}

TEST(otDatasetIsValid, shouldReturnFalseForIncompletePendingDataset)
{
    FakePlatform             fakePlatform;
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);

    // Provide Pending Timestamp but omit Delay Timer.
    dataset.mPendingTimestamp.mSeconds             = 100;
    dataset.mPendingTimestamp.mTicks               = 0;
    dataset.mComponents.mIsPendingTimestampPresent = true;

    otDatasetConvertToTlvs(&dataset, &datasetTlvs);

    EXPECT_FALSE(otDatasetIsValid(&datasetTlvs, false));
}

// Saves an Active Dataset with the given Active Timestamp as the local dataset and returns it.
static otOperationalDataset SaveLocalActiveDataset(uint64_t aTimestampSeconds)
{
    otOperationalDataset     dataset;
    otOperationalDatasetTlvs datasetTlvs;

    EXPECT_EQ(otDatasetCreateNewNetwork(FakePlatform::CurrentInstance(), &dataset), OT_ERROR_NONE);

    dataset.mActiveTimestamp.mSeconds = aTimestampSeconds;

    otDatasetConvertToTlvs(&dataset, &datasetTlvs);
    EXPECT_EQ(otDatasetSetActiveTlvs(FakePlatform::CurrentInstance(), &datasetTlvs), OT_ERROR_NONE);

    return dataset;
}

// Saves @p aDataset, re-stamped with the given Active Timestamp, using `ActiveDatasetManager::Save()`. This is the
// path taken for a dataset received from the network, e.g., in a Child ID Response. It updates the local dataset
// only when the received Active Timestamp is newer than the local one.
static void SaveActiveDatasetFromNetwork(otOperationalDataset aDataset, uint64_t aTimestampSeconds)
{
    otOperationalDatasetTlvs datasetTlvs;
    MeshCoP::Dataset         dataset;

    aDataset.mActiveTimestamp.mSeconds = aTimestampSeconds;
    otDatasetConvertToTlvs(&aDataset, &datasetTlvs);

    EXPECT_EQ(dataset.SetFrom(datasetTlvs), OT_ERROR_NONE);
    EXPECT_EQ(AsCoreType(FakePlatform::CurrentInstance()).Get<MeshCoP::ActiveDatasetManager>().Save(dataset),
              OT_ERROR_NONE);
}

// Registers a state changed callback on @p aMockStateCallback which fails the test if
// `OT_CHANGED_ACTIVE_DATASET` is signaled.
template <typename MockStateCallback> void ExpectNoActiveDatasetChangedEvent(MockStateCallback &aMockStateCallback)
{
    EXPECT_CALL(aMockStateCallback, Call).Times(AnyNumber());

    EXPECT_CALL(aMockStateCallback, Call(Truly([](otChangedFlags aChangedFlags) -> bool {
                    return (aChangedFlags & OT_CHANGED_ACTIVE_DATASET);
                })))
        .Times(0);

    EXPECT_EQ(otSetStateChangedCallback(FakePlatform::CurrentInstance(), MockStateCallback::CallWithContext,
                                        &aMockStateCallback),
              OT_ERROR_NONE);
}

TEST(DatasetManagerSave, shouldNotTriggerStateCallbackWhenTimestampIsEqual)
{
    FakePlatform fakePlatform;

    typedef MockCallback<void, otChangedFlags> MockStateCallback;

    MockStateCallback    mockStateCallback;
    otOperationalDataset dataset = SaveLocalActiveDataset(100);

    // Let the event from the initial save be dispatched before registering the callback.
    fakePlatform.GoInMs(1000);

    ExpectNoActiveDatasetChangedEvent(mockStateCallback);

    // The dataset is not saved, since its Active Timestamp is not newer than the local one.
    SaveActiveDatasetFromNetwork(dataset, 100);

    fakePlatform.GoInMs(10000);
}

TEST(DatasetManagerSave, shouldNotTriggerStateCallbackWhenTimestampIsOlder)
{
    FakePlatform fakePlatform;

    typedef MockCallback<void, otChangedFlags> MockStateCallback;

    MockStateCallback    mockStateCallback;
    otOperationalDataset dataset = SaveLocalActiveDataset(100);

    // Let the event from the initial save be dispatched before registering the callback.
    fakePlatform.GoInMs(1000);

    ExpectNoActiveDatasetChangedEvent(mockStateCallback);

    // The dataset is not saved, since its Active Timestamp is older than the local one. Instead, an `MGMT_SET` is
    // scheduled to push the newer local dataset back to the leader.
    SaveActiveDatasetFromNetwork(dataset, 50);

    // Go past `kSendSetDelay` so that the scheduled `MGMT_SET` is also covered.
    fakePlatform.GoInMs(10000);
}

TEST(DatasetManagerSave, shouldTriggerStateCallbackWhenTimestampIsNewer)
{
    FakePlatform fakePlatform;

    typedef MockCallback<void, otChangedFlags> MockStateCallback;

    MockStateCallback    mockStateCallback;
    otOperationalDataset dataset = SaveLocalActiveDataset(100);

    fakePlatform.GoInMs(1000);

    EXPECT_CALL(mockStateCallback, Call).Times(AnyNumber());

    EXPECT_CALL(mockStateCallback, Call(Truly([](otChangedFlags aChangedFlags) -> bool {
                    return (aChangedFlags & OT_CHANGED_ACTIVE_DATASET);
                })))
        .Times(AtLeast(1));

    EXPECT_EQ(otSetStateChangedCallback(FakePlatform::CurrentInstance(), MockStateCallback::CallWithContext,
                                        &mockStateCallback),
              OT_ERROR_NONE);

    // The dataset is saved, since its Active Timestamp is newer than the local one.
    SaveActiveDatasetFromNetwork(dataset, 200);

    fakePlatform.GoInMs(10000);
}

// Unlike `DatasetManager::Save()`, saving through the public API updates the local dataset even
// when the Active Timestamp is older than the local one, and therefore always signals the change.
TEST(otDatasetSetActiveTlvs, shouldTriggerStateCallbackEvenWhenTimestampIsOlder)
{
    FakePlatform fakePlatform;

    typedef MockCallback<void, otChangedFlags> MockStateCallback;

    MockStateCallback mockStateCallback;

    SaveLocalActiveDataset(100);

    // Let the event from the initial save be dispatched before registering the callback.
    fakePlatform.GoInMs(1000);

    EXPECT_CALL(mockStateCallback, Call).Times(AnyNumber());

    EXPECT_CALL(mockStateCallback, Call(Truly([](otChangedFlags aChangedFlags) -> bool {
                    return (aChangedFlags & OT_CHANGED_ACTIVE_DATASET);
                })))
        .Times(AtLeast(1));

    EXPECT_EQ(otSetStateChangedCallback(FakePlatform::CurrentInstance(), MockStateCallback::CallWithContext,
                                        &mockStateCallback),
              OT_ERROR_NONE);

    SaveLocalActiveDataset(50);

    fakePlatform.GoInMs(10000);
}