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using System;

using UnityEngine.InputSystem;

using UnityEngine.InputSystem.LowLevel;

using UnityEngine.InputSystem.EnhancedTouch;

namespace Unity.RenderStreaming

{

enum KeyboardEventType

{

KeyUp = 0,

KeyDown = 1,

}

enum EventType

{

Keyboard = 0,

Mouse = 1,

MouseWheel = 2,

Touch = 3,

ButtonClick = 4

}

public static class RemoteInput

{

public static Keyboard Keyboard { get; private set; }

public static Mouse RemoteMouse { get; private set; }

public static Touchscreen RemoteTouch { get; private set; }

public static Action<int> ActionButtonClick;

static UnityEngine.Vector2Int m_prevMousePos;

static bool m_isInitialized = false;

public static void Initialize()

{

Keyboard = InputSystem.AddDevice<Keyboard>();

RemoteMouse = InputSystem.AddDevice<Mouse>();

EnhancedTouchSupport.Enable();

RemoteTouch = InputSystem.AddDevice<Touchscreen>();

m_isInitialized = true;

}

//---------------------------------------------------------------------------------------------------------------------

public static void Destroy()

{

InputSystem.RemoveDevice(RemoteMouse);

InputSystem.RemoveDevice(Keyboard);

EnhancedTouchSupport.Disable();

InputSystem.RemoveDevice(RemoteTouch);

RemoteMouse = null;

Keyboard = null;

RemoteTouch = null;

m_isInitialized = false;

}

//---------------------------------------------------------------------------------------------------------------------

public static void ProcessInput(byte[] bytes)

{

switch ((EventType)bytes[0])

{

case EventType.Keyboard:

var type = (KeyboardEventType)bytes[1];

var repeat = bytes[2] == 1;

var key = bytes[3];

var character = (char)bytes[4];

ProcessKeyEvent(type, repeat, key, character);

break;

case EventType.Mouse:

var deltaX = BitConverter.ToInt16(bytes, 1);

var deltaY = BitConverter.ToInt16(bytes, 3);

var button = bytes[5];

ProcessMouseMoveEvent(deltaX, deltaY, button);

break;

case EventType.MouseWheel:

var scrollX = BitConverter.ToSingle(bytes, 1);

var scrollY = BitConverter.ToSingle(bytes, 5);

ProcessMouseWheelEvent(scrollX, scrollY);

break;

case EventType.Touch:

var length = bytes[1];

var index = 2;

var touches = new TouchState[length];

for (int i = 0; i < length; i++)

{

const int INPUTSYSTEM_ZERO_ID_GUARD = 128; //ID 0 is reserved by inputsystem

int identifier = BitConverter.ToInt32(bytes, index) + INPUTSYSTEM_ZERO_ID_GUARD;

index += 4;

var phase = (UnityEngine.InputSystem.TouchPhase)bytes[index];

index += 1;

var pageX = BitConverter.ToInt16(bytes, index);

index += 2;

var pageY = BitConverter.ToInt16(bytes, index);

index += 2;

var force = BitConverter.ToSingle(bytes, index);

index += 4;

touches[i] = new TouchState

{

touchId = identifier,

phase = phase,

position = new UnityEngine.Vector2Int(pageX, pageY),

pressure = force

};

}

ProcessTouchMoveEvent(touches);

if (Touch.activeTouches.Count > length)

{

ChangeEndStateUnusedTouches(touches);

}

break;

case EventType.ButtonClick:

var elementId = BitConverter.ToInt16(bytes, 1);

ProcessButtonClickEvent(elementId);

break;

}

}

public static void Reset()

{

if (!m_isInitialized)

return;

InputSystem.QueueStateEvent(RemoteMouse, new MouseState());

InputSystem.QueueStateEvent(Keyboard, new KeyboardState());

InputSystem.QueueStateEvent(RemoteTouch, new TouchState());

InputSystem.Update();

}

static void ProcessKeyEvent(KeyboardEventType state, bool repeat, byte keyCode, char character)

{

switch(state)

{

case KeyboardEventType.KeyDown:

if (!repeat)

{

InputSystem.QueueStateEvent(Keyboard, new KeyboardState((Key)keyCode));

}

if(character != 0)

{

InputSystem.QueueTextEvent(Keyboard, character);

}

break;

case KeyboardEventType.KeyUp:

InputSystem.QueueStateEvent(Keyboard, new KeyboardState());

break;

}

}

static void ProcessMouseMoveEvent(short x, short y, byte button)

{

UnityEngine.Vector2Int pos = new UnityEngine.Vector2Int(x, y);

UnityEngine.Vector2Int delta = pos- m_prevMousePos;

InputSystem.QueueStateEvent(RemoteMouse, new MouseState {

position = pos,

delta = delta,

buttons = button

});

m_prevMousePos = pos;

}

static void ProcessMouseWheelEvent(float scrollX, float scrollY)

{

InputSystem.QueueStateEvent(RemoteMouse, new MouseState { scroll = new UnityEngine.Vector2(scrollX, scrollY) });

}

static void ProcessTouchMoveEvent(TouchState[] touches)

{

for (var i = 0; i < touches.Length; i++)

{

InputSystem.QueueStateEvent(RemoteTouch, touches[i]);

}

}

static void ChangeEndStateUnusedTouches(TouchState[] touches)

{

int touchCount = Touch.activeTouches.Count;

for (var i = 0; i < touchCount; i++)

{

int touchId = Touch.activeTouches[i].touchId;

if (!Array.Exists(touches, v => v.touchId == touchId))

{

if (Touch.activeTouches[i].phase == TouchPhase.Ended)

{

continue;

}

InputSystem.QueueStateEvent(RemoteTouch, new TouchState

{

touchId = touchId,

phase = TouchPhase.Ended,

position = Touch.activeTouches[i].screenPosition

});

}

}

}

static void ProcessButtonClickEvent(int elementId)

{

if (ActionButtonClick != null)

{

ActionButtonClick(elementId);

}

}

}

}