/**
 * @file
 *
 * @author  Mamadou Babaei <mamadou@senseglove.com>
 *
 * @section LICENSE
 *
 * (The MIT License)
 *
 * Copyright (c) 2020 - 2026 SenseGlove
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * @section DESCRIPTION
 *
 *
 */


#pragma once

#include "HeadMountedDisplayTypes.h"
#include "IHandTracker.h"
#include "IInputDevice.h"
#include "IOpenXRExtensionPlugin.h"
#include "Math/MathFwd.h"
#include "Templates/UniquePtr.h"
#include "UObject/NameTypes.h"
#include "XRMotionControllerBase.h"

#include "SGBuildHacks/SGPlatform.h"

struct SENSEGLOVETRACKING_API FSGXRHandState;

class SENSEGLOVETRACKING_API FSGXRTracker final : public IOpenXRExtensionPlugin,
                                                  public IInputDevice,
                                                  public FXRMotionControllerBase,
                                                  public IHandTracker
{
public:
    static bool GetMotionControllerState(
        UObject* WorldContextObject,
        EXRSpaceType XRSpaceType, EControllerHand Hand, EXRControllerPoseType XRControllerPoseType,
        FXRMotionControllerState& OutMotionControllerState);
    static bool GetHandTrackingState(
        UObject* WorldContextObject,
        EXRSpaceType XRSpaceType, EControllerHand Hand,
        FXRHandTrackingState& OutHandTrackingState);

private:
    struct FImpl;

    struct FImplDeleter
    {
        void operator()(const FImpl* P) const;
    };

    TUniquePtr<FImpl, FImplDeleter> Pimpl;
    FImplDeleter PimplDeleter;

private:
    FSGXRTracker() = delete;

public:
    FSGXRTracker(const TSharedRef<FGenericApplicationMessageHandler>& InMessageHandler);

public:
    /**
     * The copy constructor.
     */
    FSGXRTracker(const FSGXRTracker& Rhs) = delete;

    /**
     * The move constructor.
     */
    FSGXRTracker(FSGXRTracker&& Rhs) SG_NOEXCEPT;

public:
    /**
     * The destructor.
     */
    virtual ~FSGXRTracker() override;

public:
    /**
     * The copy assignment operator.
     */
    FSGXRTracker& operator=(const FSGXRTracker& Rhs) = delete;

    /**
     * The move assignment operator.
     */
    FSGXRTracker& operator=(FSGXRTracker&& Rhs) SG_NOEXCEPT;

public:
    bool IsHandTrackingSupportedByDevice() const;

    const FSGXRHandState& GetLeftHandState() const;
    const FSGXRHandState& GetRightHandState() const;

public:
    // The IOpenXRExtensionPlugin interface.

    virtual FString GetDisplayName() override;
    virtual bool GetRequiredExtensions(TArray<const ANSICHAR*>& OutExtensions) override;
    virtual const void* OnGetSystem(XrInstance InInstance, const void* InNext) override;
    virtual const void* OnCreateSession(XrInstance InInstance, XrSystemId InSystem, const void* InNext) override;
    virtual const void* OnBeginSession(XrSession InSession, const void* InNext) override;
    virtual void UpdateDeviceLocations(XrSession InSession, XrTime DisplayTime, XrSpace TrackingSpace) override;

public:
    // The IMotionController interface.

    virtual bool GetControllerOrientationAndPosition(const int32 ControllerIndex, const FName MotionSource,
                                                     FRotator& OutOrientation, FVector& OutPosition,
                                                     float WorldToMetersScale) const override;
    virtual ETrackingStatus GetControllerTrackingStatus(const int32 ControllerIndex,
                                                        const FName MotionSource) const override;
    virtual FName GetMotionControllerDeviceTypeName() const override;
    virtual void EnumerateSources(TArray<FMotionControllerSource>& SourcesOut) const override;

public:
    // The IInputDevice interface.

    virtual void Tick(float DeltaTime) override;
    virtual void SendControllerEvents() override;
    virtual void SetMessageHandler(const TSharedRef<FGenericApplicationMessageHandler>& InMessageHandler) override;
    virtual bool Exec(UWorld* InWorld, const TCHAR* Cmd, FOutputDevice& Ar) override;
    virtual void SetChannelValue(int32 ControllerId, FForceFeedbackChannelType ChannelType, float Value) override;
    virtual void SetChannelValues(int32 ControllerId, const FForceFeedbackValues& Values) override;
    virtual bool SupportsForceFeedback(int32 ControllerId) override;
    virtual bool IsGamepadAttached() const override;

public:
    // The IHandTracker interface.

    virtual FName GetHandTrackerDeviceTypeName() const override;
    virtual bool IsHandTrackingStateValid() const override;
    virtual bool GetKeypointState(
        EControllerHand Hand,
        EHandKeypoint Keypoint, FTransform& OutTransform, float& OutRadius) const override;

    virtual bool GetAllKeypointStates(
        EControllerHand Hand,
        TArray<FVector>& OutPositions, TArray<FQuat>& OutRotations, TArray<float>& OutRadii,
        bool& OutIsTracked) const override;
};