/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *    All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "qvIO.h"

#include "AppConfig.h"
#include "AppEvent.h"
#include "AppTask.h"
#include "ota.h"

#include <app/server/OnboardingCodesUtil.h>

#include <app-common/zap-generated/attribute-id.h>
#include <app-common/zap-generated/attribute-type.h>
#include <app-common/zap-generated/attributes/Accessors.h>
#include <app/server/Dnssd.h>
#include <app/server/Server.h>
#include <app/util/attribute-storage.h>

#include <credentials/DeviceAttestationCredsProvider.h>
#include <credentials/examples/DeviceAttestationCredsExample.h>

#include <inet/EndPointStateOpenThread.h>

#include <DeviceInfoProviderImpl.h>
#include <setup_payload/QRCodeSetupPayloadGenerator.h>
#include <setup_payload/SetupPayload.h>

using namespace ::chip;
using namespace ::chip::app;
using namespace chip::TLV;
using namespace chip::Credentials;
using namespace chip::DeviceLayer;

#include <platform/CHIPDeviceLayer.h>

#define FACTORY_RESET_TRIGGER_TIMEOUT 3000
#define FACTORY_RESET_CANCEL_WINDOW_TIMEOUT 3000
#define OTA_START_TRIGGER_TIMEOUT 1500

#define APP_TASK_STACK_SIZE (2 * 1024)
#define APP_TASK_PRIORITY 2
#define APP_EVENT_QUEUE_SIZE 10
#define QPG_LOCK_ENDPOINT_ID (1)

namespace {
TaskHandle_t sAppTaskHandle;
QueueHandle_t sAppEventQueue;

bool sIsThreadProvisioned = false;
bool sIsThreadEnabled     = false;
bool sHaveBLEConnections  = false;

uint8_t sAppEventQueueBuffer[APP_EVENT_QUEUE_SIZE * sizeof(AppEvent)];

StaticQueue_t sAppEventQueueStruct;

StackType_t appStack[APP_TASK_STACK_SIZE / sizeof(StackType_t)];
StaticTask_t appTaskStruct;

chip::DeviceLayer::DeviceInfoProviderImpl gExampleDeviceInfoProvider;
} // namespace

AppTask AppTask::sAppTask;

namespace {
constexpr int extDiscTimeoutSecs = 20;
}

void LockOpenThreadTask(void)
{
    chip::DeviceLayer::ThreadStackMgr().LockThreadStack();
}

void UnlockOpenThreadTask(void)
{
    chip::DeviceLayer::ThreadStackMgr().UnlockThreadStack();
}

CHIP_ERROR AppTask::StartAppTask()
{
    sAppEventQueue = xQueueCreateStatic(APP_EVENT_QUEUE_SIZE, sizeof(AppEvent), sAppEventQueueBuffer, &sAppEventQueueStruct);
    if (sAppEventQueue == nullptr)
    {
        ChipLogError(NotSpecified, "Failed to allocate app event queue");
        return CHIP_ERROR_NO_MEMORY;
    }

    // Start App task.
    sAppTaskHandle = xTaskCreateStatic(AppTaskMain, APP_TASK_NAME, ArraySize(appStack), nullptr, 1, appStack, &appTaskStruct);
    if (sAppTaskHandle == nullptr)
    {
        return CHIP_ERROR_NO_MEMORY;
    }

    return CHIP_NO_ERROR;
}

void AppTask::InitServer(intptr_t arg)
{
    static chip::CommonCaseDeviceServerInitParams initParams;
    (void) initParams.InitializeStaticResourcesBeforeServerInit();

    gExampleDeviceInfoProvider.SetStorageDelegate(initParams.persistentStorageDelegate);
    chip::DeviceLayer::SetDeviceInfoProvider(&gExampleDeviceInfoProvider);

    chip::Inet::EndPointStateOpenThread::OpenThreadEndpointInitParam nativeParams;
    nativeParams.lockCb                = LockOpenThreadTask;
    nativeParams.unlockCb              = UnlockOpenThreadTask;
    nativeParams.openThreadInstancePtr = chip::DeviceLayer::ThreadStackMgrImpl().OTInstance();
    initParams.endpointNativeParams    = static_cast<void *>(&nativeParams);
    chip::Server::GetInstance().Init(initParams);

#if CHIP_DEVICE_CONFIG_ENABLE_EXTENDED_DISCOVERY
    chip::app::DnssdServer::Instance().SetExtendedDiscoveryTimeoutSecs(extDiscTimeoutSecs);
#endif
}
CHIP_ERROR AppTask::Init()
{
    CHIP_ERROR err = CHIP_NO_ERROR;

    PlatformMgr().AddEventHandler(MatterEventHandler, 0);

    ChipLogProgress(NotSpecified, "Current Software Version: %s", CHIP_DEVICE_CONFIG_DEVICE_SOFTWARE_VERSION_STRING);

    // Init ZCL Data Model and start server
    PlatformMgr().ScheduleWork(InitServer, 0);

    ReturnErrorOnFailure(mFactoryDataProvider.Init());
    SetDeviceInstanceInfoProvider(&mFactoryDataProvider);
    SetCommissionableDataProvider(&mFactoryDataProvider);

    SetDeviceAttestationCredentialsProvider(&mFactoryDataProvider);

    // Setup Bolt
    err = BoltLockMgr().Init();
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(NotSpecified, "BoltLockMgr().Init() failed");
        return err;
    }
    BoltLockMgr().SetCallbacks(ActionInitiated, ActionCompleted);

    // Setup button handler
    qvIO_SetBtnCallback(ButtonEventHandler);

    qvIO_LedSet(LOCK_STATE_LED, !BoltLockMgr().IsUnlocked());

    UpdateClusterState();

    ConfigurationMgr().LogDeviceConfig();
    PrintOnboardingCodes(chip::RendezvousInformationFlags(chip::RendezvousInformationFlag::kBLE));

    UpdateLEDs();

    return err;
}

void AppTask::AppTaskMain(void * pvParameter)
{
    AppEvent event;

    while (true)
    {
        BaseType_t eventReceived = xQueueReceive(sAppEventQueue, &event, portMAX_DELAY);
        while (eventReceived == pdTRUE)
        {
            sAppTask.DispatchEvent(&event);
            eventReceived = xQueueReceive(sAppEventQueue, &event, 0);
        }
    }
}

void AppTask::LockActionEventHandler(AppEvent * aEvent)
{
    bool initiated = false;
    BoltLockManager::Action_t action;
    int32_t actor;
    CHIP_ERROR err = CHIP_NO_ERROR;

    if (aEvent->Type == AppEvent::kEventType_Lock)
    {
        action = static_cast<BoltLockManager::Action_t>(aEvent->LockEvent.Action);
        actor  = aEvent->LockEvent.Actor;
    }
    else if (aEvent->Type == AppEvent::kEventType_Button)
    {
        if (BoltLockMgr().IsUnlocked())
        {
            action = BoltLockManager::LOCK_ACTION;
        }
        else
        {
            action = BoltLockManager::UNLOCK_ACTION;
        }
        actor = AppEvent::kEventType_Button;
    }
    else
    {
        err = CHIP_ERROR_INTERNAL;
    }

    if (err == CHIP_NO_ERROR)
    {
        initiated = BoltLockMgr().InitiateAction(actor, action);

        if (!initiated)
        {
            ChipLogProgress(NotSpecified, "Action is already in progress or active.");
        }
    }
}

void AppTask::ButtonEventHandler(uint8_t btnIdx, bool btnPressed)
{
    if (btnIdx != APP_LOCK_BUTTON && btnIdx != APP_FUNCTION_BUTTON)
    {
        return;
    }

    AppEvent button_event              = {};
    button_event.Type                  = AppEvent::kEventType_Button;
    button_event.ButtonEvent.ButtonIdx = btnIdx;
    button_event.ButtonEvent.Action    = btnPressed;

    if (btnIdx == APP_LOCK_BUTTON && btnPressed == true)
    {
        button_event.Handler = LockActionEventHandler;
    }
    else if (btnIdx == APP_FUNCTION_BUTTON)
    {
        // Hand off to Functionality handler - depends on duration of press
        button_event.Handler = FunctionHandler;
    }
    else
    {
        return;
    }

    sAppTask.PostEvent(&button_event);
}

void AppTask::TimerEventHandler(chip::System::Layer * aLayer, void * aAppState)
{
    AppEvent event;
    event.Type               = AppEvent::kEventType_Timer;
    event.TimerEvent.Context = aAppState;
    event.Handler            = FunctionTimerEventHandler;
    sAppTask.PostEvent(&event);
}

void AppTask::FunctionTimerEventHandler(AppEvent * aEvent)
{
    if (aEvent->Type != AppEvent::kEventType_Timer)
    {
        return;
    }

    // If we reached here, the button was held past OTA_START_TRIGGER_TIMEOUT,
    // initiate OTA update
    if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_StartBleAdv)
    {
        ChipLogProgress(NotSpecified, "[BTN] Release button now to start Software Updater");
        ChipLogProgress(NotSpecified, "[BTN] Hold to trigger Factory Reset");
        sAppTask.mFunction = kFunction_SoftwareUpdate;
        sAppTask.StartTimer(FACTORY_RESET_TRIGGER_TIMEOUT - OTA_START_TRIGGER_TIMEOUT);
    }
    else if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_SoftwareUpdate)
    {
        ChipLogProgress(NotSpecified, "[BTN] Factory Reset selected. Release within %us to cancel.",
                        FACTORY_RESET_CANCEL_WINDOW_TIMEOUT / 1000);

        // Start timer for FACTORY_RESET_CANCEL_WINDOW_TIMEOUT to allow user to
        // cancel, if required.
        sAppTask.StartTimer(FACTORY_RESET_CANCEL_WINDOW_TIMEOUT);

        sAppTask.mFunction = kFunction_FactoryReset;

        // Turn off all LEDs before starting blink to make sure blink is
        // co-ordinated.
        qvIO_LedSet(SYSTEM_STATE_LED, false);
        qvIO_LedSet(LOCK_STATE_LED, false);

        qvIO_LedBlink(SYSTEM_STATE_LED, 500, 500);
        qvIO_LedBlink(LOCK_STATE_LED, 500, 500);
    }
    else if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_FactoryReset)
    {
        // Actually trigger Factory Reset
        sAppTask.mFunction = kFunction_NoneSelected;
        chip::Server::GetInstance().ScheduleFactoryReset();
    }
}

void AppTask::FunctionHandler(AppEvent * aEvent)
{
    if (aEvent->ButtonEvent.ButtonIdx != APP_FUNCTION_BUTTON)
    {
        return;
    }

    // To trigger BLE advertising: press the APP_FUNCTION_BUTTON button briefly (<
    // OTA_START_TRIGGER_TIMEOUT). To trigger software update: press the button
    // between 1.5sec and 3sec. To initiate factory reset: press the
    // APP_FUNCTION_BUTTON for FACTORY_RESET_TRIGGER_TIMEOUT +
    // FACTORY_RESET_CANCEL_WINDOW_TIMEOUT All LEDs start blinking after
    // FACTORY_RESET_TRIGGER_TIMEOUT to signal factory reset has been initiated.
    // To cancel factory reset: release the APP_FUNCTION_BUTTON once all LEDs
    // start blinking within the FACTORY_RESET_CANCEL_WINDOW_TIMEOUT
    if (aEvent->ButtonEvent.Action == true)
    {
        if (!sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_NoneSelected)
        {
            ChipLogProgress(NotSpecified, "[BTN] Hold to select function:");
            ChipLogProgress(NotSpecified, "[BTN] - Trigger BLE adv (0-1.5s)");
            ChipLogProgress(NotSpecified, "[BTN] - Trigger OTA (1.5-3s)");
            ChipLogProgress(NotSpecified, "[BTN] - Factory Reset (>6s)");

            sAppTask.StartTimer(OTA_START_TRIGGER_TIMEOUT);
            sAppTask.mFunction = kFunction_StartBleAdv;
        }
    }
    else
    {
        // If the button was released before 1.5sec, trigger BLE advertising.
        if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_StartBleAdv)
        {
            sAppTask.CancelTimer();
            sAppTask.mFunction = kFunction_NoneSelected;

            if (ConnectivityMgr().IsBLEAdvertisingEnabled())
            {
                ChipLogProgress(NotSpecified, "BLE advertising already in progress.");
            }
            else
            {
                if (!ConnectivityMgr().IsThreadProvisioned())
                {
                    // Enable BLE advertisements and pairing window
                    if (chip::Server::GetInstance().GetCommissioningWindowManager().OpenBasicCommissioningWindow() == CHIP_NO_ERROR)
                    {
                        ChipLogProgress(NotSpecified, "BLE advertising started. Waiting for Pairing.");
                    }
                }
                else
                {
                    ChipLogError(NotSpecified, "Network is already provisioned, BLE advertisement not enabled");
                }
            }
        }
        else if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_SoftwareUpdate)
        {
            sAppTask.CancelTimer();

            sAppTask.mFunction = kFunction_NoneSelected;

            ChipLogProgress(NotSpecified, "[BTN] Triggering OTA Query");

            TriggerOTAQuery();
        }
        else if (sAppTask.mFunctionTimerActive && sAppTask.mFunction == kFunction_FactoryReset)
        {
            // Set lock status LED back to show state of lock.
            qvIO_LedSet(LOCK_STATE_LED, !BoltLockMgr().IsUnlocked());

            sAppTask.CancelTimer();

            // Change the function to none selected since factory reset has been
            // canceled.
            sAppTask.mFunction = kFunction_NoneSelected;

            ChipLogProgress(NotSpecified, "[BTN] Factory Reset has been Canceled");
        }
    }
}

void AppTask::CancelTimer()
{
    chip::DeviceLayer::SystemLayer().CancelTimer(TimerEventHandler, this);
    mFunctionTimerActive = false;
}

void AppTask::StartTimer(uint32_t aTimeoutInMs)
{
    CHIP_ERROR err;

    chip::DeviceLayer::SystemLayer().CancelTimer(TimerEventHandler, this);
    err = chip::DeviceLayer::SystemLayer().StartTimer(chip::System::Clock::Milliseconds32(aTimeoutInMs), TimerEventHandler, this);
    SuccessOrExit(err);

    mFunctionTimerActive = true;
exit:
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(NotSpecified, "StartTimer failed %s: ", chip::ErrorStr(err));
    }
}

void AppTask::ActionInitiated(BoltLockManager::Action_t aAction, int32_t aActor)
{
    // If the action has been initiated by the lock, update the bolt lock trait
    // and start flashing the LEDs rapidly to indicate action initiation.
    if (aAction == BoltLockManager::LOCK_ACTION)
    {
        ChipLogProgress(NotSpecified, "Lock Action has been initiated");
    }
    else if (aAction == BoltLockManager::UNLOCK_ACTION)
    {
        ChipLogProgress(NotSpecified, "Unlock Action has been initiated");
    }

    if (aActor == AppEvent::kEventType_Button)
    {
        sAppTask.mSyncClusterToButtonAction = true;
    }

    qvIO_LedBlink(LOCK_STATE_LED, 50, 50);
}

void AppTask::ActionCompleted(BoltLockManager::Action_t aAction)
{
    // if the action has been completed by the lock, update the bolt lock trait.
    // Turn on the lock LED if in a LOCKED state OR
    // Turn off the lock LED if in an UNLOCKED state.
    if (aAction == BoltLockManager::LOCK_ACTION)
    {
        ChipLogProgress(NotSpecified, "Lock Action has been completed");

        qvIO_LedSet(LOCK_STATE_LED, true);
    }
    else if (aAction == BoltLockManager::UNLOCK_ACTION)
    {
        ChipLogProgress(NotSpecified, "Unlock Action has been completed");

        qvIO_LedSet(LOCK_STATE_LED, false);
    }

    if (sAppTask.mSyncClusterToButtonAction)
    {
        sAppTask.UpdateClusterState();
        sAppTask.mSyncClusterToButtonAction = false;
    }
}

void AppTask::PostLockActionRequest(int32_t aActor, BoltLockManager::Action_t aAction)
{
    AppEvent event;
    event.Type             = AppEvent::kEventType_Lock;
    event.LockEvent.Actor  = aActor;
    event.LockEvent.Action = aAction;
    event.Handler          = LockActionEventHandler;
    PostEvent(&event);
}

void AppTask::PostEvent(const AppEvent * aEvent)
{
    if (sAppEventQueue != NULL)
    {
        if (!xQueueSend(sAppEventQueue, aEvent, 1))
        {
            ChipLogError(NotSpecified, "Failed to post event to app task event queue");
        }
    }
    else
    {
        ChipLogError(NotSpecified, "Event Queue is NULL should never happen");
    }
}

void AppTask::DispatchEvent(AppEvent * aEvent)
{
    if (aEvent->Handler)
    {
        aEvent->Handler(aEvent);
    }
    else
    {
        ChipLogError(NotSpecified, "Event received with no handler. Dropping event.");
    }
}

/**
 * Update cluster status after application level changes
 */
void AppTask::UpdateClusterState(void)
{
    using namespace chip::app::Clusters;
    auto newValue = BoltLockMgr().IsUnlocked() ? DoorLock::DlLockState::kUnlocked : DoorLock::DlLockState::kLocked;

    ChipLogProgress(NotSpecified, "UpdateClusterState");

    EmberAfStatus status = DoorLock::Attributes::LockState::Set(DOOR_LOCK_SERVER_ENDPOINT, newValue);
    if (status != EMBER_ZCL_STATUS_SUCCESS)
    {
        ChipLogError(NotSpecified, "ERR: updating DoorLock %x", status);
    }
}

void AppTask::UpdateLEDs(void)
{
    // If system has "full connectivity", keep the LED On constantly.
    //
    // If thread and service provisioned, but not attached to the thread network
    // yet OR no connectivity to the service OR subscriptions are not fully
    // established THEN blink the LED Off for a short period of time.
    //
    // If the system has ble connection(s) uptill the stage above, THEN blink
    // the LEDs at an even rate of 100ms.
    //
    // Otherwise, blink the LED ON for a very short time.
    if (sIsThreadProvisioned && sIsThreadEnabled)
    {
        qvIO_LedBlink(SYSTEM_STATE_LED, 950, 50);
    }
    else if (sHaveBLEConnections)
    {
        qvIO_LedBlink(SYSTEM_STATE_LED, 100, 100);
    }
    else
    {
        qvIO_LedBlink(SYSTEM_STATE_LED, 50, 950);
    }
}

void AppTask::MatterEventHandler(const ChipDeviceEvent * event, intptr_t)
{
    switch (event->Type)
    {
    case DeviceEventType::kServiceProvisioningChange: {
        sIsThreadProvisioned = event->ServiceProvisioningChange.IsServiceProvisioned;
        UpdateLEDs();
        break;
    }

    case DeviceEventType::kThreadConnectivityChange: {
        sIsThreadEnabled = (event->ThreadConnectivityChange.Result == kConnectivity_Established);
        UpdateLEDs();
        break;
    }

    case DeviceEventType::kCHIPoBLEConnectionEstablished: {
        sHaveBLEConnections = true;
        UpdateLEDs();
        break;
    }

    case DeviceEventType::kCHIPoBLEConnectionClosed: {
        sHaveBLEConnections = false;
        UpdateLEDs();
        break;
    }

    default:
        break;
    }
}