using Ryujinx.Common;
using Ryujinx.Common.Configuration.Hid;
using Ryujinx.Common.Configuration.Hid.Controller;
using Ryujinx.Common.Configuration.Hid.Controller.Motion;
using Ryujinx.Common.Logging;
using Ryujinx.HLE.HOS.Services.Hid;
using System;
using System.Buffers;
using System.Collections.Concurrent;
using System.Numerics;
using System.Runtime.CompilerServices;
using CemuHookClient = Ryujinx.Input.Motion.CemuHook.Client;
using ConfigControllerType = Ryujinx.Common.Configuration.Hid.ControllerType;

namespace Ryujinx.Input.HLE
{
    public class NpadController : IDisposable
    {
        private class HLEButtonMappingEntry
        {
            public readonly GamepadButtonInputId DriverInputId;
            public readonly ControllerKeys HLEInput;

            public HLEButtonMappingEntry(GamepadButtonInputId driverInputId, ControllerKeys hleInput)
            {
                DriverInputId = driverInputId;
                HLEInput = hleInput;
            }
        }

        private static readonly HLEButtonMappingEntry[] _hleButtonMapping =
        [
            new(GamepadButtonInputId.A, ControllerKeys.A),
            new(GamepadButtonInputId.B, ControllerKeys.B),
            new(GamepadButtonInputId.X, ControllerKeys.X),
            new(GamepadButtonInputId.Y, ControllerKeys.Y),
            new(GamepadButtonInputId.LeftStick, ControllerKeys.LStick),
            new(GamepadButtonInputId.RightStick, ControllerKeys.RStick),
            new(GamepadButtonInputId.LeftShoulder, ControllerKeys.L),
            new(GamepadButtonInputId.RightShoulder, ControllerKeys.R),
            new(GamepadButtonInputId.LeftTrigger, ControllerKeys.Zl),
            new(GamepadButtonInputId.RightTrigger, ControllerKeys.Zr),
            new(GamepadButtonInputId.DpadUp, ControllerKeys.DpadUp),
            new(GamepadButtonInputId.DpadDown, ControllerKeys.DpadDown),
            new(GamepadButtonInputId.DpadLeft, ControllerKeys.DpadLeft),
            new(GamepadButtonInputId.DpadRight, ControllerKeys.DpadRight),
            new(GamepadButtonInputId.Minus, ControllerKeys.Minus),
            new(GamepadButtonInputId.Plus, ControllerKeys.Plus),

            new(GamepadButtonInputId.SingleLeftTrigger0, ControllerKeys.SlLeft),
            new(GamepadButtonInputId.SingleRightTrigger0, ControllerKeys.SrLeft),
            new(GamepadButtonInputId.SingleLeftTrigger1, ControllerKeys.SlRight),
            new(GamepadButtonInputId.SingleRightTrigger1, ControllerKeys.SrRight)
        ];

        private class HLEKeyboardMappingEntry
        {
            public readonly Key TargetKey;
            public readonly byte Target;

            public HLEKeyboardMappingEntry(Key targetKey, byte target)
            {
                TargetKey = targetKey;
                Target = target;
            }
        }

        private static readonly HLEKeyboardMappingEntry[] _keyMapping =
        [
            new(Key.A, 0x4),
            new(Key.B, 0x5),
            new(Key.C, 0x6),
            new(Key.D, 0x7),
            new(Key.E, 0x8),
            new(Key.F, 0x9),
            new(Key.G, 0xA),
            new(Key.H, 0xB),
            new(Key.I, 0xC),
            new(Key.J, 0xD),
            new(Key.K, 0xE),
            new(Key.L, 0xF),
            new(Key.M, 0x10),
            new(Key.N, 0x11),
            new(Key.O, 0x12),
            new(Key.P, 0x13),
            new(Key.Q, 0x14),
            new(Key.R, 0x15),
            new(Key.S, 0x16),
            new(Key.T, 0x17),
            new(Key.U, 0x18),
            new(Key.V, 0x19),
            new(Key.W, 0x1A),
            new(Key.X, 0x1B),
            new(Key.Y, 0x1C),
            new(Key.Z, 0x1D),

            new(Key.Number1, 0x1E),
            new(Key.Number2, 0x1F),
            new(Key.Number3, 0x20),
            new(Key.Number4, 0x21),
            new(Key.Number5, 0x22),
            new(Key.Number6, 0x23),
            new(Key.Number7, 0x24),
            new(Key.Number8, 0x25),
            new(Key.Number9, 0x26),
            new(Key.Number0, 0x27),

            new(Key.Enter,        0x28),
            new(Key.Escape,       0x29),
            new(Key.BackSpace,    0x2A),
            new(Key.Tab,          0x2B),
            new(Key.Space,        0x2C),
            new(Key.Minus,        0x2D),
            new(Key.Plus,         0x2E),
            new(Key.BracketLeft,  0x2F),
            new(Key.BracketRight, 0x30),
            new(Key.BackSlash,    0x31),
            new(Key.Tilde,        0x32),
            new(Key.Semicolon,    0x33),
            new(Key.Quote,        0x34),
            new(Key.Grave,        0x35),
            new(Key.Comma,        0x36),
            new(Key.Period,       0x37),
            new(Key.Slash,        0x38),
            new(Key.CapsLock,     0x39),

            new(Key.F1,  0x3a),
            new(Key.F2,  0x3b),
            new(Key.F3,  0x3c),
            new(Key.F4,  0x3d),
            new(Key.F5,  0x3e),
            new(Key.F6,  0x3f),
            new(Key.F7,  0x40),
            new(Key.F8,  0x41),
            new(Key.F9,  0x42),
            new(Key.F10, 0x43),
            new(Key.F11, 0x44),
            new(Key.F12, 0x45),

            new(Key.PrintScreen, 0x46),
            new(Key.ScrollLock,  0x47),
            new(Key.Pause,       0x48),
            new(Key.Insert,      0x49),
            new(Key.Home,        0x4A),
            new(Key.PageUp,      0x4B),
            new(Key.Delete,      0x4C),
            new(Key.End,         0x4D),
            new(Key.PageDown,    0x4E),
            new(Key.Right,       0x4F),
            new(Key.Left,        0x50),
            new(Key.Down,        0x51),
            new(Key.Up,          0x52),

            new(Key.NumLock,        0x53),
            new(Key.KeypadDivide,   0x54),
            new(Key.KeypadMultiply, 0x55),
            new(Key.KeypadSubtract, 0x56),
            new(Key.KeypadAdd,      0x57),
            new(Key.KeypadEnter,    0x58),
            new(Key.Keypad1,        0x59),
            new(Key.Keypad2,        0x5A),
            new(Key.Keypad3,        0x5B),
            new(Key.Keypad4,        0x5C),
            new(Key.Keypad5,        0x5D),
            new(Key.Keypad6,        0x5E),
            new(Key.Keypad7,        0x5F),
            new(Key.Keypad8,        0x60),
            new(Key.Keypad9,        0x61),
            new(Key.Keypad0,        0x62),
            new(Key.KeypadDecimal,  0x63),

            new(Key.F13, 0x68),
            new(Key.F14, 0x69),
            new(Key.F15, 0x6A),
            new(Key.F16, 0x6B),
            new(Key.F17, 0x6C),
            new(Key.F18, 0x6D),
            new(Key.F19, 0x6E),
            new(Key.F20, 0x6F),
            new(Key.F21, 0x70),
            new(Key.F22, 0x71),
            new(Key.F23, 0x72),
            new(Key.F24, 0x73),

            new(Key.ControlLeft,  0xE0),
            new(Key.ShiftLeft,    0xE1),
            new(Key.AltLeft,      0xE2),
            new(Key.WinLeft,      0xE3),
            new(Key.ControlRight, 0xE4),
            new(Key.ShiftRight,   0xE5),
            new(Key.AltRight,     0xE6),
            new(Key.WinRight,     0xE7)
        ];

        private static readonly HLEKeyboardMappingEntry[] _keyModifierMapping =
        [
            new(Key.ControlLeft,  0),
            new(Key.ShiftLeft,    1),
            new(Key.AltLeft,      2),
            new(Key.WinLeft,      3),
            new(Key.ControlRight, 4),
            new(Key.ShiftRight,   5),
            new(Key.AltRight,     6),
            new(Key.WinRight,     7),
            new(Key.CapsLock,     8),
            new(Key.ScrollLock,   9),
            new(Key.NumLock,      10)
        ];

        private MotionInput _leftMotionInput;
        private MotionInput _rightMotionInput;

        private IGamepad _gamepad;
        private InputConfig _config;

        public IGamepadDriver GamepadDriver { get; private set; }
        public GamepadStateSnapshot State { get; private set; }

        public string Id { get; private set; }

        private readonly CemuHookClient _cemuHookClient;

        public NpadController(CemuHookClient cemuHookClient)
        {
            State = default;
            Id = null;
            _cemuHookClient = cemuHookClient;
        }

        public bool UpdateDriverConfiguration(IGamepadDriver gamepadDriver, InputConfig config)
        {
            GamepadDriver = gamepadDriver;

            _gamepad?.Dispose();

            Id = config.Id;
            _gamepad = GamepadDriver.GetGamepad(Id);

            UpdateUserConfiguration(config);

            return _gamepad != null;
        }

        public void UpdateUserConfiguration(InputConfig config)
        {
            if (config is StandardControllerInputConfig controllerConfig)
            {
                bool needsMotionInputUpdate = _config is not StandardControllerInputConfig oldControllerConfig ||
                    ((oldControllerConfig.Motion.EnableMotion != controllerConfig.Motion.EnableMotion) &&
                    (oldControllerConfig.Motion.MotionBackend != controllerConfig.Motion.MotionBackend));

                if (needsMotionInputUpdate)
                {
                    UpdateMotionInput(controllerConfig.Motion);
                }
            }
            else
            {
                // Non-controller doesn't have motions.
                _leftMotionInput = null;
            }

            _config = config;

            _gamepad?.SetConfiguration(config);
        }

        private void UpdateMotionInput(MotionConfigController motionConfig)
        {
            if (motionConfig.MotionBackend != MotionInputBackendType.CemuHook)
            {
                _leftMotionInput = new MotionInput();
                _rightMotionInput = new MotionInput();
            }
            else
            {
                _leftMotionInput = null;
                _rightMotionInput = null;
            }
        }

        public void Update()
        {
            // _gamepad may be altered by other threads
            IGamepad gamepad = _gamepad;

            if (gamepad != null && GamepadDriver != null)
            {
                State = gamepad.GetMappedStateSnapshot();

                if (_config is StandardControllerInputConfig controllerConfig && controllerConfig.Motion.EnableMotion)
                {
                    if (controllerConfig.Motion.MotionBackend == MotionInputBackendType.GamepadDriver)
                    {
                        if ((gamepad.Features & GamepadFeaturesFlag.Motion) != 0)
                        {
                            Vector3 accelerometer = gamepad.GetMotionData(MotionInputId.Accelerometer);
                            Vector3 gyroscope = gamepad.GetMotionData(MotionInputId.Gyroscope);

                            accelerometer = new Vector3(accelerometer.X, -accelerometer.Z, accelerometer.Y);
                            gyroscope = new Vector3(gyroscope.X, -gyroscope.Z, gyroscope.Y);

                            _leftMotionInput.Update(accelerometer, gyroscope, (ulong)PerformanceCounter.ElapsedNanoseconds / 1000, controllerConfig.Motion.Sensitivity, (float)controllerConfig.Motion.GyroDeadzone);

                            if (controllerConfig.ControllerType == ConfigControllerType.JoyconPair)
                            {
                                if (gamepad.Id == "JoyConPair")
                                {
                                    Vector3 rightAccelerometer = gamepad.GetMotionData(MotionInputId.SecondAccelerometer);
                                    Vector3 rightGyroscope = gamepad.GetMotionData(MotionInputId.SecondGyroscope);

                                    rightAccelerometer = new Vector3(rightAccelerometer.X, -rightAccelerometer.Z, rightAccelerometer.Y);
                                    rightGyroscope = new Vector3(rightGyroscope.X, -rightGyroscope.Z, rightGyroscope.Y);

                                    _rightMotionInput.Update(rightAccelerometer, rightGyroscope, (ulong)PerformanceCounter.ElapsedNanoseconds / 1000, controllerConfig.Motion.Sensitivity, (float)controllerConfig.Motion.GyroDeadzone);
                                }
                                else
                                {
                                    _rightMotionInput = _leftMotionInput;
                                }
                            }
                        }
                    }
                    else if (controllerConfig.Motion.MotionBackend == MotionInputBackendType.CemuHook && controllerConfig.Motion is CemuHookMotionConfigController cemuControllerConfig)
                    {
                        int clientId = (int)controllerConfig.PlayerIndex;

                        // First of all ensure we are registered
                        _cemuHookClient.RegisterClient(clientId, cemuControllerConfig.DsuServerHost, cemuControllerConfig.DsuServerPort);

                        // Then request and retrieve the data
                        _cemuHookClient.RequestData(clientId, cemuControllerConfig.Slot);
                        _cemuHookClient.TryGetData(clientId, cemuControllerConfig.Slot, out _leftMotionInput);

                        if (controllerConfig.ControllerType == ConfigControllerType.JoyconPair)
                        {
                            if (!cemuControllerConfig.MirrorInput)
                            {
                                _cemuHookClient.RequestData(clientId, cemuControllerConfig.AltSlot);
                                _cemuHookClient.TryGetData(clientId, cemuControllerConfig.AltSlot, out _rightMotionInput);
                            }
                            else
                            {
                                _rightMotionInput = _leftMotionInput;
                            }
                        }
                    }
                }
            }
            else
            {
                // Reset states
                State = default;
                _leftMotionInput = null;
                _rightMotionInput = null;
            }
        }

        public GamepadInput GetHLEInputState()
        {
            GamepadInput state = new();

            // First update all buttons
            foreach (HLEButtonMappingEntry entry in _hleButtonMapping)
            {
                if (State.IsPressed(entry.DriverInputId))
                {
                    state.Buttons |= entry.HLEInput;
                }
            }

            if (_gamepad is IKeyboard)
            {
                (float leftAxisX, float leftAxisY) = State.GetStick(StickInputId.Left);
                (float rightAxisX, float rightAxisY) = State.GetStick(StickInputId.Right);

                state.LStick = new JoystickPosition
                {
                    Dx = ClampAxis(leftAxisX),
                    Dy = ClampAxis(leftAxisY),
                };

                state.RStick = new JoystickPosition
                {
                    Dx = ClampAxis(rightAxisX),
                    Dy = ClampAxis(rightAxisY),
                };
            }
            else if (_config is StandardControllerInputConfig controllerConfig)
            {
                (float leftAxisX, float leftAxisY) = State.GetStick(StickInputId.Left);
                (float rightAxisX, float rightAxisY) = State.GetStick(StickInputId.Right);

                state.LStick = ClampToCircle(ApplyDeadzone(leftAxisX, leftAxisY, controllerConfig.DeadzoneLeft), controllerConfig.RangeLeft);
                state.RStick = ClampToCircle(ApplyDeadzone(rightAxisX, rightAxisY, controllerConfig.DeadzoneRight), controllerConfig.RangeRight);
            }

            return state;
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static JoystickPosition ApplyDeadzone(float x, float y, float deadzone)
        {
            float magnitudeClamped = Math.Min(MathF.Sqrt(x * x + y * y), 1f);

            if (magnitudeClamped <= deadzone)
            {
                return new JoystickPosition { Dx = 0, Dy = 0 };
            }

            return new JoystickPosition
            {
                Dx = ClampAxis((x / magnitudeClamped) * ((magnitudeClamped - deadzone) / (1 - deadzone))),
                Dy = ClampAxis((y / magnitudeClamped) * ((magnitudeClamped - deadzone) / (1 - deadzone))),
            };
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static short ClampAxis(float value)
        {
            if (Math.Sign(value) < 0)
            {
                return (short)Math.Max(value * -short.MinValue, short.MinValue);
            }

            return (short)Math.Min(value * short.MaxValue, short.MaxValue);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static JoystickPosition ClampToCircle(JoystickPosition position, float range)
        {
            Vector2 point = new Vector2(position.Dx, position.Dy) * range;

            if (point.Length() > short.MaxValue)
            {
                point = point / point.Length() * short.MaxValue;
            }

            return new JoystickPosition
            {
                Dx = (int)point.X,
                Dy = (int)point.Y,
            };
        }

        public SixAxisInput GetHLEMotionState(bool isJoyconRightPair = false)
        {
            float[] orientationForHLE = new float[9];
            Vector3 gyroscope;
            Vector3 accelerometer;
            Vector3 rotation;

            MotionInput motionInput = _leftMotionInput;

            if (isJoyconRightPair)
            {
                if (_rightMotionInput == null)
                {
                    return default;
                }

                motionInput = _rightMotionInput;
            }

            if (motionInput != null)
            {
                gyroscope = Truncate(motionInput.Gyroscrope * 0.0027f, 3);
                accelerometer = Truncate(motionInput.Accelerometer, 3);
                rotation = Truncate(motionInput.Rotation * 0.0027f, 3);

                Matrix4x4 orientation = motionInput.GetOrientation();

                orientationForHLE[0] = Math.Clamp(orientation.M11, -1f, 1f);
                orientationForHLE[1] = Math.Clamp(orientation.M12, -1f, 1f);
                orientationForHLE[2] = Math.Clamp(orientation.M13, -1f, 1f);
                orientationForHLE[3] = Math.Clamp(orientation.M21, -1f, 1f);
                orientationForHLE[4] = Math.Clamp(orientation.M22, -1f, 1f);
                orientationForHLE[5] = Math.Clamp(orientation.M23, -1f, 1f);
                orientationForHLE[6] = Math.Clamp(orientation.M31, -1f, 1f);
                orientationForHLE[7] = Math.Clamp(orientation.M32, -1f, 1f);
                orientationForHLE[8] = Math.Clamp(orientation.M33, -1f, 1f);
            }
            else
            {
                gyroscope = new Vector3();
                accelerometer = new Vector3();
                rotation = new Vector3();
            }

            return new SixAxisInput
            {
                Accelerometer = accelerometer,
                Gyroscope = gyroscope,
                Rotation = rotation,
                Orientation = orientationForHLE,
            };
        }

        private static Vector3 Truncate(Vector3 value, int decimals)
        {
            float power = MathF.Pow(10, decimals);

            value.X = float.IsNegative(value.X) ? MathF.Ceiling(value.X * power) / power : MathF.Floor(value.X * power) / power;
            value.Y = float.IsNegative(value.Y) ? MathF.Ceiling(value.Y * power) / power : MathF.Floor(value.Y * power) / power;
            value.Z = float.IsNegative(value.Z) ? MathF.Ceiling(value.Z * power) / power : MathF.Floor(value.Z * power) / power;

            return value;
        }

        public static KeyboardInput GetHLEKeyboardInput(IGamepadDriver KeyboardDriver)
        {
            IKeyboard keyboard = KeyboardDriver.GetGamepad("0") as IKeyboard;

            KeyboardStateSnapshot keyboardState = keyboard.GetKeyboardStateSnapshot();

            KeyboardInput hidKeyboard = new()
            {
                Modifier = 0,
                Keys = new ulong[0x4],
            };

            foreach (HLEKeyboardMappingEntry entry in _keyMapping)
            {
                ulong value = keyboardState.IsPressed(entry.TargetKey) ? 1UL : 0UL;

                hidKeyboard.Keys[entry.Target / 0x40] |= (value << (entry.Target % 0x40));
            }

            foreach (HLEKeyboardMappingEntry entry in _keyModifierMapping)
            {
                int value = keyboardState.IsPressed(entry.TargetKey) ? 1 : 0;

                hidKeyboard.Modifier |= value << entry.Target;
            }

            return hidKeyboard;

        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                _gamepad?.Dispose();
            }
        }

        public void Dispose()
        {
            GC.SuppressFinalize(this);
            Dispose(true);
        }

        public void UpdateRumble(ConcurrentQueue<(VibrationValue, VibrationValue)> queue)
        {
            if (queue.TryDequeue(out (VibrationValue, VibrationValue) dualVibrationValue))
            {
                if (_config is StandardControllerInputConfig controllerConfig && controllerConfig.Rumble.EnableRumble)
                {
                    VibrationValue leftVibrationValue = dualVibrationValue.Item1;
                    VibrationValue rightVibrationValue = dualVibrationValue.Item2;

                    float low = Math.Min(1f, (float)((rightVibrationValue.AmplitudeLow * 0.85 + rightVibrationValue.AmplitudeHigh * 0.15) * controllerConfig.Rumble.StrongRumble));
                    float high = Math.Min(1f, (float)((leftVibrationValue.AmplitudeLow * 0.15 + leftVibrationValue.AmplitudeHigh * 0.85) * controllerConfig.Rumble.WeakRumble));

                    _gamepad?.Rumble(low, high, uint.MaxValue);

                    Logger.Debug?.Print(LogClass.Hid, $"Effect for {controllerConfig.PlayerIndex} " +
                        $"L.low.amp={leftVibrationValue.AmplitudeLow}, " +
                        $"L.high.amp={leftVibrationValue.AmplitudeHigh}, " +
                        $"R.low.amp={rightVibrationValue.AmplitudeLow}, " +
                        $"R.high.amp={rightVibrationValue.AmplitudeHigh} " +
                        $"--> ({low}, {high})");
                }
            }
        }
    }
}
