#define ADDR_ASSERTS

using ImGuiNET;
using System.Numerics;
using SharpPluginLoader.Core;
using SharpPluginLoader.Core.Entities;
using SharpPluginLoader.Core.IO;
using SharpPluginLoader.Core.View;
using SharpPluginLoader.Core.Memory;
using SharpPluginLoader.Core.Actions;
using SharpPluginLoader.Core.Components;
using SharpPluginLoader.Core.Configuration;
#if ADDR_ASSERTS
using System.Diagnostics;
#endif

// @TODO:
//  - targetCamera -> targetPlayerCamera
//  - UI button to disable fragile workarounds.
//  - Manully set freecam viewport index.
//  - Save direct camera offsets as preset.
//  - Ability to disable more inputs in freecam.
/*
PadDown = 0x198, PadOld = 0x19C, PadTrg = 0x1A0, PadRel = 0x1A4, PadChg = 0x1A8
uint PadDown = MemoryUtil.Read<uint>(sMhSteamController.Instance + 0x198);
MemoryUtil.WriteBytes(sMhSteamController.Instance + 0x198, BitConverter.GetBytes(PadRel));
*/
// Known Issues:
//  - Leaving dialoge when vp.Camera.Up is slightly off will not apply camera offsets when it should.
//   - Test Case: Go up to the handler with the camera left of the player. Talk to her and click Post a New Quest.
//     Then after the open book animation, leave the dialoge and the camera should jump.
//  - Getting up from cart doesn't apply offsets when it should.
//  - Greatly increasing FOV to mitigate culling when camera is rolled causes issues.
//   - HUD overlays misplaced.
//   - Other various hard to explain graphical errors.
//  - Offsetting the camera too much can easily break culling if the camera is behind the ground/wall/ceiling.

namespace MHWNewCamera
{
    public unsafe class Plugin : IPlugin
    {
        public string Name => "MHW New Camera";
        public string Author => "Akon City Software";

        private const double DEFAULT_FOV = 60.0;

        private bool modDisabled = false;
        private bool modToggleDisabled = false;

        private float cameraSpeed;
        private float cameraZoomSpeed;
        private float cameraSpeedModifier;
        private float cameraSensitivity;
        private int stickDeadzone;
        private double cameraPitchLimit;

        private double cameraFov = DEFAULT_FOV;
        private float cameraForward = 0.0f;
        private float cameraLeft = 0.0f;
        private float cameraXOffset = 0.0f;
        private float cameraYOffset = 0.0f;
        private float cameraZOffset = 0.0f;
        private double cameraPitch = 0.0;
        private double cameraYaw = 0.0;
        private double cameraRoll = 0.0;

        private double? preZoomFov = null;
        private double? preZoomRoll = null;

        private bool freeCamera = false;
        private bool toggleFreeCamera = false;
        private bool unlockMovementHeld = false;
        private bool unlockMovementToggled = false;

        private bool offsetPerspective = false;
        private bool toggleOffsetPerspective = false;
        private Camera? targetCamera = null;
        private Player? lastPlayer = null;
        private float previousFov = -1.0f;
        private int previousCameraAnimState = 0;
        private bool changeAfterMapOpened = true;
        private bool changeAfterGetUp = true;
        private bool changeAfterInsideTent = true;
        private float? resetFovInView = null;

        private delegate void CalculateCameraDelegate(nint unknownPtr);
        private Hook<CalculateCameraDelegate>? calculateCameraHook;

        private delegate void CalculateViewDelegate(nint unknownPtr);
        private Hook<CalculateViewDelegate>? calculateViewHook;

        private delegate float CalculateMovementDelegate(int stickValue);
        private Hook<CalculateMovementDelegate>? calculateMovementHook;

        private bool disableCollision = false;
        private bool disableExtraCollision = false;
        private bool disableGravity = false;
        private bool disableExtraGravity = false;
        private Patch disableXCollision;
        private Patch disableYCollision;
        private Patch disableSecondaryYCollision;
        private Patch disableZCollision;
        private Patch disableExtraYCollision;
        private Patch disableGravityYUpdate;
        private Patch disableGravityXZUpdate;
        /*
        private Patch disableRotationGravity;
        private Patch disableRotationGravity2;
        private Patch disableRotationGravity3;
        private Patch disableRotationGravity4;
        private Patch disableRotationGravity5;
        */
        private Patch disableGravityEval;

        private void disableCollisionEnable()
        {
            disableXCollision.Enable();
            disableYCollision.Enable();
            disableSecondaryYCollision.Enable();
            disableZCollision.Enable();
        }

        private void disableCollisionDisable()
        {
            disableXCollision.Disable();
            disableYCollision.Disable();
            disableSecondaryYCollision.Disable();
            disableZCollision.Disable();
        }

        private void disableExtraCollisionEnable()
        {
            disableExtraYCollision.Enable();
        }

        private void disableExtraCollisionDisable()
        {
            disableExtraYCollision.Disable();
        }

        private void disableGravityEnable()
        {
            disableGravityYUpdate.Enable();
        }

        private void disableGravityDisable()
        {
            disableGravityYUpdate.Disable();
        }

        private void disableExtraGravityEnable()
        {
            disableGravityEval.Enable();
            /*
            disableRotationGravity.Enable();
            disableRotationGravity2.Enable();
            disableRotationGravity3.Enable();
            disableRotationGravity4.Enable();
            disableRotationGravity5.Enable();
            disableGravityXZUpdate.Enable();
            */
        }

        private void disableExtraGravityDisable()
        {
            disableGravityEval.Disable();
            /*
            disableRotationGravity.Disable();
            disableRotationGravity2.Disable();
            disableRotationGravity3.Disable();
            disableRotationGravity4.Disable();
            disableRotationGravity5.Disable();
            disableGravityXZUpdate.Disable();
            */
        }

        private string typedPresetName = "";

        private static readonly MtObject sMhSteamController = SingletonManager.GetSingleton("sMhSteamController")!;

        public void OnLoad()
        {
            Config config = ConfigManager.GetConfig<Config>(this);

            Config.Settings settings = config.CameraSettings;
            cameraSpeed = settings.CameraSpeed;
            cameraZoomSpeed = settings.CameraZoomSpeed;
            cameraSpeedModifier = settings.CameraSpeedModifier;
            cameraSensitivity = settings.CameraSensitivity;
            stickDeadzone = settings.StickDeadzone;
            cameraPitchLimit = settings.CameraPitchLimit;

            toggleOffsetPerspective = config.PerspectiveCameraEnabled;
            if (config.Selected != "")
            {
                Config.Preset preset = config.Presets[config.Selected];
                cameraFov = preset.FOV;
                cameraForward = preset.Forward;
                cameraLeft = preset.Left;
                cameraYOffset = preset.Up;
                cameraRoll = preset.Roll;
            }

            ConfigManager.SaveConfig<Config>(this);

            // Asserts based on version 15.23.00.

            // Hook where we can adjust the camera position.
            nint addr = PatternScanner.FindFirst(Pattern.FromString("48 8B C4 55 41 57 48 81 EC D8 00 00 00 44 0F 29 40 B8 45 33 FF ?? ?? ?? ?? ?? ?? ?? ?? ?? 48 8B E9"));
#if ADDR_ASSERTS
            Trace.Assert(addr == 0x141fa5380);
#endif
            calculateCameraHook = Hook.Create<CalculateCameraDelegate>(addr, CalculateCameraHook);

            // Hook where we can directly modify the view matrix.
            addr = PatternScanner.FindFirst(Pattern.FromString("48 89 5C 24 08 48 89 6C 24 10 48 89 74 24 18 48 89 7C 24 20 41 54 41 56 41 57 48 81 EC 90 00 00 00 ?? ?? ?? ?? ?? ?? ?? 48 8B F9"));
#if ADDR_ASSERTS
            Trace.Assert(addr == 0x14228eb60);
#endif
            calculateViewHook = Hook.Create<CalculateViewDelegate>(addr, CalculateViewHook);

            // Hook where we can adjust the analog stick value the game uses.
            addr = PatternScanner.FindFirst(Pattern.FromString("66 0F 6E C1 0F 5B C0 85 C9 78 11"));
#if ADDR_ASSERTS
            Trace.Assert(addr == 0x142107cb0);
#endif
            calculateMovementHook = Hook.Create<CalculateMovementDelegate>(addr, CalculateMovementHook);

            unchecked
            {
                // Noop collision checks.
                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 06 F3 0F 10 48 04 F3 0F 58 4E 04 F3 0F 11 4E 04 F3 0F 10 40 08 F3 0F 58 46 08 F3 0F 11 46 08 44 8B AF E0 0B 00 00"));
#if ADDR_ASSERTS
                Trace.Assert(addr == 0x141c001b5);
#endif
                disableXCollision = new Patch(addr, [0x90, 0x90, 0x90, 0x90]);
#if ADDR_ASSERTS
                Trace.Assert(addr + 0xe == 0x141c001c3);
#endif
                disableYCollision = new Patch(addr + 0xe, [0x90, 0x90, 0x90, 0x90, 0x90]);
#if ADDR_ASSERTS
                Trace.Assert(addr + 0x1d == 0x141c001d2);
#endif
                disableZCollision = new Patch(addr + 0x1d, [0x90, 0x90, 0x90, 0x90, 0x90]);

                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 46 04 F3 0F 10 46 08 F3 0F 5C C2 F3 0F 11 46 08 ?? ?? F3 0F"));
#if ADDR_ASSERTS
                Trace.Assert(addr == 0x141c000d2);
#endif
                disableSecondaryYCollision = new Patch(addr, [0x90, 0x90, 0x90, 0x90, 0x90]);

                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 46 04 F3 0F 10 58 08 F3 0F 58 5E 08 F3 0F 11 5E 08 44 8B 87 D0 0B 00 00 41 F6 C0 03"));
#if ADDR_ASSERTS
                Trace.Assert(addr == 0x141bfff90);
#endif
                disableExtraYCollision = new Patch(addr, [0x90, 0x90, 0x90, 0x90, 0x90]);

                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 83 80 00 00 00 F3 0F 11 8B 84 00 00 00 F3 0F 11 93 88 00 00 00 89 B3 8C 00 00 00 8B 83 A4 01 00 00 C1 E8 05 44 0F 29 A4 24 D0 01 00 00 44 0F 29 B4 24 B0 01 00 00 A8 01"));
#if ADDR_ASSERTS
                Trace.Assert(addr + 0x8 == 0x1413259ed);
#endif
                disableGravityYUpdate = new Patch(addr + 0x8, [
                    0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                ]);
                disableGravityXZUpdate = new Patch(addr, [
                    0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                    0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, // Will already be applied.
                    0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
                ]);

                /*
                // <PLAYER>+0xac0

                // 141325C19 - F3 0F11 83 80000000  - movss [rbx+00000080],xmm0
                // 141325C36 - F3 0F11 83 84000000  - movss [rbx+00000084],xmm0
                // 141325C54 - F3 0F11 83 88000000  - movss [rbx+00000088],xmm0
                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 59 DB F3 0F 59 D2 F3 0F 11 83 80 00 00 00 F3 0F 58 E3 F3 0F 10 83 84 00 00 00 F3 41 0F 5C C4 F3 0F 58 E2 F3 0F 11 83 84 00 00 00 F3 0F 10 83 88 00 00 00 F3 41 0F 5C C5 44 0F 28 AC 24 C0 01 00 00 F3 0F 11 83 88 00 00 00"));
#if ADDR_ASSERTS
                Trace.Assert(addr + 0x8 == 0x141325c19);
#endif
                disableRotationGravity = new Patch(addr + 0x8, [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]);
                disableRotationGravity2 = new Patch(addr + 0x25, [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]);
                disableRotationGravity3 = new Patch(addr + 0x43, [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]);

                // 1425D94E4 - F3 0F11 86 C0000000  - movss [rsi+000000C0],xmm0
                // 1425D94F4 - F3 0F11 86 C8000000  - movss [rsi+000000C8],xmm0
                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 86 C0 00 00 00 F3 0F 10 85 48 02 00 00 F3 0F 11 86 C8 00 00 00 F3 0F 10 85 50 02 00 00 F3 0F 11 8E C4 00 00 00 F3 0F 10 8D 54 02 00 00 89 BE CC 00 00 00 F3 0F 11 86 D0 00 00 00 F3 0F 10 85 58 02 00 00 F3 0F 11 86 D8 00 00 00 F3 0F 10 85 68 02 00 00"));
#if ADDR_ASSERTS
                Trace.Assert(addr == 0x1425D94E4);
#endif
                disableRotationGravity4 = new Patch(addr, [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]);
                disableRotationGravity5 = new Patch(addr + 0x10, [0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90]);
                */

                // Stop falling from moving player.
                // 141BFFEFC - F3 0F11 7E 04  - movss [rsi+04],xmm7
                //
                // Instance (of many?) of Y position evaluation for falling?
                // 141325E2A - 44 0F2F 9B 80010000  - comiss xmm11,[rbx+00000180]

                // 141BFFF75 - E8 965872FF           - call MonsterHunterWorld.exe+1325810
                addr = PatternScanner.FindFirst(Pattern.FromString("F3 0F 11 97 54 15 00 00 F3 0F 11 8F 58 15 00 00 F3 0F 10 47 68 F3 0F 5E D8 44 89 B7 6C 15 00 00 F3 0F 5E D0 F3 0F 5E C8 F3 0F 11 9F 60 15 00 00 F3 0F 11 97 64 15 00 00 F3 0F 11 8F 68 15 00 00"));
#if ADDR_ASSERTS
                Trace.Assert(addr + 0x40 == 0x141BFFF75);
#endif
                disableGravityEval = new Patch(addr + 0x40, [0x90, 0x90, 0x90, 0x90, 0x90]);
            }
        }

        // These "assume" functions are really scuffed and almost certainly could have
        // more proper checks, I just haven't gotten around to it.

        // Quest board menu.
        private static bool assumeInQuestBoard(float fov)
        {
            return fov == 20.000038f || fov == 20.017189f || fov == 20.00004f;
        }

        private bool assumeOnRails(Viewport vp, Camera camera)
        {
            // 1. Seasonal gathering hub cutscene.
            // 2. Zoom into quest board or the handler's book.
            // 3. Leaving tent.
            // 4. Getting up from carting.
            // 5. Leaving dialoge with NPC.
            // Checking Up.Y != 1.0f is an attempt to include only #2.
            return vp.Camera != null && vp.Camera.Instance != camera.Instance && vp.Camera.FarClip == 4000000 &&
                vp.Camera.Fix && vp.Camera.Up.Y != 1.0f;
        }

        private bool assumeInOpenMap(float fov)
        {
            if (fov == 50.942066f)
            {
                if (!changeAfterMapOpened)
                {
                    return true;
                }
                // Assume the camera's FOV could end up at 50.942066 during normal gameplay.
                // Try to mitigate that by tracking the triggers for opening the map
                // (press and quickly release select or press A at departure location).
                if (Input.IsReleased(Button.Share) || Input.IsPressed(Button.Cross))
                {
                    changeAfterMapOpened = false;
                    return true;
                }
            }

            if (!changeAfterMapOpened) changeAfterMapOpened = true;

            return false;
        }

        private bool assumeInCanteen(float fov, float previousFov)
        {
            if (fov == 50.0f)
            {
                if (!changeAfterGetUp)
                {
                    return true;
                }
                // Assume that FOV will be greater than or equal to 51.0 before sitting at the canteen.
                // Also, assume that if FOV is equal to 50.0 in a different situation, previousFov
                // will be less than 51.0 because it would have been lowering last frame.
                // This is easily the most fragile check here.
                if (previousFov >= 51.0f)
                {
                    if (Input.IsPressed(Button.Cross) || (Input.IsDown(Button.Triangle) || Input.IsReleased(Button.Triangle)))
                    {
                        changeAfterGetUp = false;
                        return true;
                    }
                }
            }

            if (!changeAfterGetUp) changeAfterGetUp = true;

            return false;
        }

        private bool assumeInEnterTent(Camera camera, int animState)
        {
            if (camera.Up.Y != 1.0f && animState == 5)
            {
                if (!changeAfterInsideTent)
                {
                    return true;
                }
                // This is possible to trip if you spam A while loading into a level before
                // seeing the wingdrake animation.
                if (previousCameraAnimState != 5)
                {
                    if (Input.IsPressed(Button.Cross))
                    {
                        changeAfterInsideTent = false;
                        return true;
                    }
                }
            }

            if (!changeAfterInsideTent) changeAfterInsideTent = true;

            return false;
        }

        private void maybeSetFovForCulling(Viewport vp, Camera camera)
        {
            /* I don't think this would be correct. As of now I'm pretty sure roll is only
             * considered after this point, in CalculateViewHook.
            if (cameraRoll == 90.0 || cameraRoll == 270.0)
            {
                camera.AspectRatio = vp.Region.Height / (float)vp.Region.Width;
            }
            */
            if (cameraRoll != 0.0 && camera.FieldOfView < 130.0f)
            {
                // The closer the FOV is to 180, the more odd behavior occurs.
                // 130 seems like a OK default for when the camera is rolled.
                // This will break HUD overlays like "!" on top of NPCs and the tent exit cutscene.
                resetFovInView = camera.FieldOfView;
                camera.FieldOfView = 130.0f;
            }
            /*
            else if (camera.FieldOfView < 60.0f)
            {
                resetFovInView = camera.FieldOfView;
                camera.FieldOfView = 60.0f;
            }
            */
        }

        private void setPerspective(Camera camera, Vector3 pos, Quaternion forward)
        {
            Quaternion left = forward * Quaternion.CreateFromRotationMatrix(Matrix4x4.CreateRotationY(Single.DegreesToRadians(180.0f)));
            pos.X += forward.X * cameraForward;
            pos.Y += forward.Y * cameraForward;
            pos.Z += forward.Z * cameraForward;
            pos.X -= left.X * cameraLeft;
            pos.Z -= left.Z * cameraLeft;
            pos.X += cameraXOffset;
            pos.Y += cameraYOffset;
            pos.Z += cameraZOffset;
            camera.Position = pos;
        }

        private static Quaternion getForward(Vector3 pos, Vector3 target)
        {
            return new Quaternion(target.X - pos.X, target.Y - pos.Y, target.Z - pos.Z, 0.0f);
        }

        // If freeCamera (camera.Move = false), this hook won't run.
        private void CalculateCameraHook(nint unknownPtr)
        {
            if (modDisabled)
            {
                calculateCameraHook!.Original(unknownPtr);
                return;
            }

            Viewport vp = CameraSystem.MainViewport;
            Camera? camera = offsetPerspective ? targetCamera : vp.Camera;
            if (camera == null) return;

            bool applyPerspective = offsetPerspective;
            if (offsetPerspective)
            {
                int cameraAnimState = MemoryUtil.Read<int>(camera.Instance + 0x240);
                applyPerspective = camera.Fix && camera.Move;
                applyPerspective &= !assumeOnRails(vp, camera);
                applyPerspective &= !assumeInQuestBoard(camera.FieldOfView);
                applyPerspective &= !assumeInOpenMap(camera.FieldOfView);
                applyPerspective &= !assumeInCanteen(camera.FieldOfView, previousFov);
                applyPerspective &= !assumeInEnterTent(camera, cameraAnimState);
                previousCameraAnimState = cameraAnimState;
            }

            previousFov = camera.FieldOfView;

            calculateCameraHook!.Original(unknownPtr);

            if (applyPerspective)
            {
                Quaternion forward = Quaternion.Normalize(getForward(camera.Position, camera.Target));
                setPerspective(camera, camera.Position, forward);
                camera.FieldOfView = (float)((cameraFov * previousFov) / 60.0);
            }

            if (toggleFreeCamera && !freeCamera)
            {
                freeCamera = true;
                camera.Move = false;
                preZoomFov = cameraFov;
                preZoomRoll = cameraRoll;
                if (applyPerspective)
                {
                    cameraFov = camera.FieldOfView;
                }
                // Camera position might have changed.
                Quaternion forward = Quaternion.Normalize(getForward(camera.Position, camera.Target));
                cameraPitch = Double.RadiansToDegrees(Math.Asin(forward.Y));
                cameraYaw = Double.RadiansToDegrees(Math.Atan2(forward.Z, forward.X));
            }

            if (applyPerspective) maybeSetFovForCulling(vp, camera);
        }

        private void CalculateViewHook(nint unknownPtr)
        {
            if (modDisabled)
            {
                calculateViewHook!.Original(unknownPtr);
                return;
            }

            Viewport vp = CameraSystem.MainViewport;
            bool notFreecam = offsetPerspective && !freeCamera;
            Camera? camera = notFreecam ? targetCamera : vp.Camera;

            bool updateView = freeCamera || offsetPerspective;
            if (resetFovInView != null && updateView && camera != null)
            {
                camera.FieldOfView = (float)resetFovInView;
                resetFovInView = null;
            }

            calculateViewHook!.Original(unknownPtr);

            if (updateView && cameraRoll != 0.0)
            {
                Matrix4x4 rollRotation = Matrix4x4.CreateRotationZ((float)Double.DegreesToRadians(cameraRoll));
                vp.ViewMatrix *= rollRotation;
            }
        }

        private float CalculateMovementHook(int stickValue)
        {
            if (!modDisabled && freeCamera && !(unlockMovementHeld || unlockMovementToggled))
            {
                stickValue = 0;
            }
            return calculateMovementHook!.Original(stickValue);
        }

        private void disableAllHooks()
        {
            if (disableExtraGravity)
            {
                disableExtraGravity = false;
                disableExtraGravityDisable();
            }
            if (disableGravity)
            {
                disableGravity = false;
                disableGravityDisable();
            }
            if (disableExtraCollision)
            {
                disableExtraCollision = false;
                disableExtraCollisionDisable();
            }
            if (disableCollision)
            {
                disableCollision = false;
                disableCollisionDisable();
            }
        }

        public void OnImGuiRender()
        {
            Config config = ConfigManager.GetConfig<Config>(this);
            float width = ImGui.GetWindowWidth();

            if (ImGui.Checkbox("Disable Mod", ref modDisabled))
            {
                if (modDisabled)
                {
                    disableAllHooks();
                    if (freeCamera)
                    {
                        freeCamera = false;
                        if (preZoomRoll != null)
                        {
                            cameraRoll = (double)preZoomRoll;
                            preZoomRoll = null;
                        }
                    }
                    for (int i = 0; i < 8; i++)
                    {
                        Viewport vp = CameraSystem.GetViewport(i);
                        if (vp.Camera != null) vp.Camera.Move = true;
                    }
                    Player? player = Player.MainPlayer;
                    if (player != null)
                    {
                        player.Rotation.X = 0.0f;
                        player.Rotation.Z = 0.0f;
                    }
                }
            }
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Try to disable as much of the mod as possible.");
                ImGui.EndTooltip();
            }
            if (modDisabled) return;
            ImGui.Checkbox("Disable Toggle Bind", ref modToggleDisabled);
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Disable button combination (Hold RStick + Press LT) for toggling free camera.");
                ImGui.EndTooltip();
            }

            ImGui.Checkbox("Enable Free Camera", ref toggleFreeCamera);
            if (toggleFreeCamera)
            {
                ImGui.PushItemFlag(ImGuiItemFlags.Disabled, true);
                ImGui.PushStyleVar(ImGuiStyleVar.Alpha, ImGui.GetStyle().Alpha * 0.5f);
            }
            if (ImGui.Checkbox("Enable Perspective Camera", ref toggleOffsetPerspective))
            {
                // Take the opposite because it's yet to be toggled.
                config.PerspectiveCameraEnabled = !offsetPerspective;
                ConfigManager.SaveConfig<Config>(this);
            }
            if (toggleFreeCamera)
            {
                ImGui.PopItemFlag();
                ImGui.PopStyleVar();
            }

            ImGui.PushID("Perspective");
            float singleFov = (float)cameraFov;
            if (ImGui.DragFloat("Field of View", ref singleFov, 0.4f, 1.0f, 179.0f))
            {
                cameraFov = singleFov;
            }
            ImGui.DragFloat("Forward", ref cameraForward, 0.4f);
            ImGui.DragFloat("Left", ref cameraLeft, 0.4f);
            ImGui.DragFloat("Up", ref cameraYOffset, 0.4f);
            if (ImGui.Button("Default"))
            {
                cameraFov = DEFAULT_FOV;
                cameraForward = 0.0f;
                cameraLeft = 0.0f;
                cameraXOffset = 0.0f;
                cameraYOffset = 0.0f;
                cameraZOffset = 0.0f;
                config.Selected = "";
                ConfigManager.SaveConfig<Config>(this);
            }
            ImGui.SameLine();
            if (ImGui.Button("Save"))
            {
                string name = typedPresetName;
                if (name != "")
                {
                    Config.Preset preset = new Config.Preset();
                    preset.FOV = cameraFov;
                    preset.Forward = cameraForward;
                    preset.Left = cameraLeft;
                    preset.Up = cameraYOffset;
                    preset.Roll = cameraRoll;
                    if (config.Presets.ContainsKey(name))
                    {
                        config.Presets[name] = preset;
                    }
                    else
                    {
                        config.Presets.Add(name, preset);
                    }
                    config.Selected = name;
                    ConfigManager.SaveConfig<Config>(this);
                }
            }
            ImGui.SameLine();
            if (ImGui.Button("Delete"))
            {
                if (config.Selected != "")
                {
                    config.Presets.Remove(config.Selected);
                    config.Selected = "";
                    ConfigManager.SaveConfig<Config>(this);
                }
            }
            ImGui.SameLine();
            ImGui.PushItemWidth(width * 0.2f);
            ImGui.InputText("##Preset Name", ref typedPresetName, 99);
            ImGui.SameLine();
            if (ImGui.BeginCombo("##Preset", config.Selected))
            {
                Dictionary<string, Config.Preset>.KeyCollection presetKeys = config.Presets.Keys;
                for (int i = 0; i < presetKeys.Count; i++)
                {
                    string presetKey = presetKeys.ElementAt(i);
                    bool isSelected = presetKey == config.Selected;
                    if (ImGui.Selectable(presetKey, isSelected))
                    {
                        config.Selected = presetKey;
                        ConfigManager.SaveConfig<Config>(this);
                        Config.Preset preset = config.Presets[config.Selected];
                        cameraFov = preset.FOV;
                        cameraForward = preset.Forward;
                        cameraLeft = preset.Left;
                        cameraYOffset = preset.Up;
                        cameraRoll = preset.Roll;
                    }
                    if (isSelected) ImGui.SetItemDefaultFocus();
                }
                ImGui.EndCombo();
            }
            ImGui.PopItemWidth();
            ImGui.PopID();

            ImGui.PushID("Settings");
            ImGui.DragFloat("Camera Speed", ref cameraSpeed, 0.01f, 0.0f);
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Movement speed in freecam.");
                ImGui.EndTooltip();
            }
            ImGui.DragFloat("Zoom Speed", ref cameraZoomSpeed, 0.01f, 0.0f);
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Rate of camera zoom.");
                ImGui.EndTooltip();
            }
            ImGui.DragFloat("Speed Modifier", ref cameraSpeedModifier, 0.01f, 0.0f);
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Value to multiply speed by when L2 is held.");
                ImGui.EndTooltip();
            }
            ImGui.DragFloat("Camera Sensitivity", ref cameraSensitivity, 0.0025f, 0.0f);
            if (ImGui.BeginItemTooltip())
            {
                ImGui.Text("Camera look sensitivity in freecam.");
                ImGui.EndTooltip();
            }
            ImGui.InputInt("Stick Deadzone", ref stickDeadzone, 10);
            if (ImGui.Button("Default"))
            {
                cameraSpeed = Config.Settings.DEFAULT_SPEED;
                cameraZoomSpeed = Config.Settings.DEFAULT_ZOOM_SPEED;
                cameraSpeedModifier = Config.Settings.DEFAULT_SPEED_MODIFIER;
                cameraSensitivity = Config.Settings.DEFAULT_SENSITIVITY;
                stickDeadzone = Config.Settings.DEFAULT_DEADZONE;
                cameraPitchLimit = Config.Settings.DEFAULT_PITCH_LIMIT;
            }
            ImGui.SameLine();
            if (ImGui.Button("Reset"))
            {
                Config.Settings settings = config.CameraSettings;
                cameraSpeed = settings.CameraSpeed;
                cameraZoomSpeed = settings.CameraZoomSpeed;
                cameraSpeedModifier = settings.CameraSpeedModifier;
                cameraSensitivity = settings.CameraSensitivity;
                stickDeadzone = settings.StickDeadzone;
                cameraPitchLimit = settings.CameraPitchLimit;
            }
            ImGui.SameLine();
            if (ImGui.Button("Save"))
            {
                Config.Settings settings = config.CameraSettings;
                settings.CameraSpeed = cameraSpeed;
                settings.CameraZoomSpeed = cameraZoomSpeed;
                settings.CameraSpeedModifier = cameraSpeedModifier;
                settings.CameraSensitivity = cameraSensitivity;
                settings.StickDeadzone = stickDeadzone;
                settings.CameraPitchLimit = cameraPitchLimit;
                config.CameraSettings = settings;
                ConfigManager.SaveConfig<Config>(this);
            }
            ImGui.PopID();

            ImGui.PushID("Debug");
            if (ImGui.CollapsingHeader("DEBUG"))
            {
                ImGui.PushID("Camera");
                if (targetCamera != null)
                {
                    ImGui.Text($"Target Camera: {targetCamera.Instance:x}");
                }
                ImGui.Text("Camera/Viewport:");
                Viewport vp;
                for (int i = 0; i < 8; i++)
                {
                    if (ImGui.CollapsingHeader($"Camera #{i}"))
                    {
                        ImGui.PushID($"Camera{i}");
                        vp = CameraSystem.GetViewport(i);
                        ImGui.Text($"Pointer: {vp.Instance:x}");
                        ImGui.Text($"Visible: {vp.Visible}");
                        ImGui.Text($"Region: {vp.Region.X} {vp.Region.Y} {vp.Region.Width} {vp.Region.Height}");
                        if (vp.Camera != null)
                        {
                            ImGui.InputFloat("X Offset", ref cameraXOffset);
                            ImGui.InputFloat("Y Offset", ref cameraYOffset);
                            ImGui.InputFloat("Z Offset", ref cameraZOffset);
                            var camera = vp.Camera;
                            ImGui.Text($"Camera Pointer: {camera.Instance:x}");
                            ImGui.DragFloat("FOV", ref camera.FieldOfView, 0.45f);
                            ImGui.Text($"Internal FOV: {previousFov}");
                            if (ImGui.BeginItemTooltip())
                            {
                                ImGui.Text("What the FOV would be if not set by us.");
                                ImGui.EndTooltip();
                            }
                            ImGui.InputFloat("Aspect Ratio", ref camera.AspectRatio);
                            ImGui.InputFloat("Far Clip", ref camera.FarClip);
                            ImGui.InputFloat("Near Clip", ref camera.NearClip);
                            ImGui.DragFloat3("Position", ref camera.Position, 0.45f);
                            ImGui.DragFloat3("Target", ref camera.Target, 0.45f);
                            ImGui.DragFloat3("Up", ref camera.Up, 0.45f);
                            ImGui.Text("Offset:");
                            float offsetForward = 0.0f;
                            if (ImGui.DragFloat("Forward", ref offsetForward, 0.45f))
                            {
                                Quaternion forward = getForward(camera.Position, camera.Target);
                                forward = Quaternion.Normalize(forward);
                                camera.Position.X += forward.X * offsetForward;
                                camera.Position.Y += forward.Y * offsetForward;
                                camera.Position.Z += forward.Z * offsetForward;
                            }
                            float offsetLeft = 0.0f;
                            if (ImGui.DragFloat("Left", ref offsetLeft, 0.45f))
                            {
                                Quaternion forward = getForward(camera.Position, camera.Target);
                                forward = Quaternion.Normalize(forward);
                                Quaternion left = forward * Quaternion.CreateFromRotationMatrix(Matrix4x4.CreateRotationY(Single.DegreesToRadians(180.0f)));
                                camera.Position.X += left.X * offsetLeft;
                                camera.Position.Z += left.Z * offsetLeft;
                            }
                            if (i == 0)
                            {
                                ImGui.Text("Rotation:");
                                double pitch = cameraPitch;
                                if (ImGui.InputDouble("Pitch", ref pitch, 0.25))
                                {
                                    cameraPitch = pitch;
                                }
                                double yaw = cameraYaw;
                                if (ImGui.InputDouble("Yaw", ref yaw, 0.25))
                                {
                                    cameraYaw = yaw;
                                }
                                float roll = (float)cameraRoll;
                                if (ImGui.DragFloat("Roll", ref roll, 0.25f))
                                {
                                    cameraRoll = roll;
                                    if (preZoomRoll != null)
                                    {
                                        preZoomRoll = roll;
                                    }
                                }
                                float pitchLimit = (float)cameraPitchLimit;
                                if (ImGui.InputFloat("Pitch Limit", ref pitchLimit, 0.0f, 0.0f, null, ImGuiInputTextFlags.EnterReturnsTrue))
                                {
                                    cameraPitchLimit = pitchLimit;
                                }
                            }
                            bool move = camera.Move;
                            if (ImGui.Checkbox("Move", ref move))
                            {
                                camera.Move = move;
                            }
                            ImGui.SameLine();
                            bool fix = camera.Fix;
                            if (ImGui.Checkbox("Fix", ref fix))
                            {
                                camera.Fix = fix;
                            }
                        }
                        ImGui.PopID();
                    }
                }
                ImGui.PopID();

                ImGui.PushID("Player");
                Player? player = Player.MainPlayer;
                if (player != null)
                {
                    ImGui.Separator();
                    ImGui.Text("Player:");
                    ImGui.Text($"Pointer: {player.Instance:x}");
                    ImGui.DragFloat3("Position", ref player.Position, 0.5f);
                    if (ImGui.Checkbox("Disable Collision", ref disableCollision))
                    {
                        if (disableCollision)
                        {
                            disableCollisionEnable();
                        }
                        else
                        {
                            if (disableExtraGravity)
                            {
                                disableExtraGravity = false;
                                disableExtraGravityDisable();
                            }
                            if (disableGravity)
                            {
                                disableGravity = false;
                                disableGravityDisable();
                            }
                            if (disableExtraCollision)
                            {
                                disableExtraCollision = false;
                                disableExtraCollisionDisable();
                            }
                            disableCollisionDisable();
                        }
                    }
                    if (!disableCollision)
                    {
                        ImGui.PushItemFlag(ImGuiItemFlags.Disabled, true);
                        ImGui.PushStyleVar(ImGuiStyleVar.Alpha, ImGui.GetStyle().Alpha * 0.5f);
                    }
                    if (ImGui.Checkbox("Disable Another Y Collision", ref disableExtraCollision))
                    {
                        if (disableExtraCollision)
                        {
                            disableExtraCollisionEnable();
                        }
                        else
                        {
                            if (disableExtraGravity)
                            {
                                disableExtraGravity = false;
                                disableExtraGravityDisable();
                            }
                            if (disableGravity)
                            {
                                disableGravity = false;
                                disableGravityDisable();
                            }
                            disableExtraCollisionDisable();
                        }
                    }
                    if (ImGui.BeginItemTooltip())
                    {
                        ImGui.Text("This will make your legs goofy, but it's needed to get on top of some things.");
                        ImGui.EndTooltip();
                    }
                    if (!disableCollision)
                    {
                        ImGui.PopItemFlag();
                        ImGui.PopStyleVar();
                    }
                    if (!disableExtraCollision)
                    {
                        ImGui.PushItemFlag(ImGuiItemFlags.Disabled, true);
                        ImGui.PushStyleVar(ImGuiStyleVar.Alpha, ImGui.GetStyle().Alpha * 0.5f);
                    }
                    if (ImGui.Checkbox("Disable Y Gravity", ref disableGravity))
                    {
                        if (disableGravity)
                        {
                            disableGravityEnable();
                        }
                        else
                        {
                            if (disableExtraGravity)
                            {
                                disableExtraGravity = false;
                                disableExtraGravityDisable();
                            }
                            disableGravityDisable();
                        }
                    }
                    if (ImGui.BeginItemTooltip())
                    {
                        ImGui.Text("Avoid falling when going too high (Y axis).");
                        ImGui.EndTooltip();
                    }
                    if (!disableExtraCollision)
                    {
                        ImGui.PopItemFlag();
                        ImGui.PopStyleVar();
                    }
                    if (!disableGravity)
                    {
                        ImGui.PushItemFlag(ImGuiItemFlags.Disabled, true);
                        ImGui.PushStyleVar(ImGuiStyleVar.Alpha, ImGui.GetStyle().Alpha * 0.5f);
                    }
                    if (ImGui.Checkbox("Disable More Gravity", ref disableExtraGravity))
                    {
                        if (disableExtraGravity)
                        {
                            disableExtraGravityEnable();
                        }
                        else
                        {
                            disableExtraGravityDisable();
                        }
                    }
                    if (ImGui.BeginItemTooltip())
                    {
                        ImGui.Text("This can stop you from starting to fall when going out of bounds and/or rotating.");
                        ImGui.EndTooltip();
                    }
                    if (!disableGravity)
                    {
                        ImGui.PopItemFlag();
                        ImGui.PopStyleVar();
                    }
                    Vector4 rotation;
                    rotation.X = player.Rotation.X;
                    rotation.Y = player.Rotation.Y;
                    rotation.Z = player.Rotation.Z;
                    rotation.W = player.Rotation.W;
                    if (ImGui.SliderFloat4("Rotation", ref rotation, -1.0f, 1.0f))
                    {
                        player.Rotation.X = rotation.X;
                        player.Rotation.Y = rotation.Y;
                        player.Rotation.Z = rotation.Z;
                        player.Rotation.W = rotation.W;
                    }
                    if (ImGui.Button("Reset"))
                    {
                        player.Rotation.X = 0.0f;
                        player.Rotation.Z = 0.0f;
                    }
                    Vector3 forward;
                    forward.X = player.Forward.X;
                    forward.Y = player.Forward.Y;
                    forward.Z = player.Forward.Z;
                    ImGui.DragFloat3("Forward", ref forward, 0.0f);
                    ActionInfo currentActionInfo = player.ActionController.CurrentAction;
                    SharpPluginLoader.Core.Actions.Action? currentAction = null;
                    if (currentActionInfo.ActionSet >= 0 && currentActionInfo.ActionSet <= 3)
                    {
                        ActionList actionList = player.ActionController.GetActionList(currentActionInfo.ActionSet);
                        if (currentActionInfo.ActionId >= 0 && currentActionInfo.ActionId < actionList.Count)
                        {
                            currentAction = actionList[currentActionInfo.ActionId];
                        }
                    }
                    AnimationLayerComponent? animationLayer = player.AnimationLayer;
                    AnimationId currentAnimation = player.CurrentAnimation;
                    ImGui.Text("Action/Animation:");
                    ImGui.Text($" Current: {currentAction}, {currentAnimation}");
                    if (animationLayer != null)
                    {
                        ImGui.Text($" Speed: {animationLayer.Speed:0.000}");
                        ImGui.Text($" Frame: {animationLayer.CurrentFrame:0.000}/{animationLayer.MaxFrame:0.000}");
                    }
                    if (currentAction != null)
                    {
                        ImGui.Text($" Active Time: {currentAction.ActiveTime}");
                        // An experiment to test potential animation error could be try to keep deltasec as consistent as possible.
                        ImGui.Text($" Delta Sec: {currentAction.DeltaSec}");
                    }
                    /*
                    // https://github.com/HunterPie/HunterPie/blob/fa73f81ed0cdc921a6cf63f96c0fcff3688d88c2/HunterPie.Integrations/Datasources/MonsterHunterWorld/Entity/Game/MHWGame.cs#L74
                    bool playerInMenu = false;
                    nint offset = MemoryUtil.Read<nint>(0x1451c4640);
                    if (offset != 0)
                    {
                        offset += 0x13FD0;
                        offset = MemoryUtil.Read<nint>(offset);
                        if (offset != 0)
                        {
                            offset += 0xB734;
                            playerInMenu = MemoryUtil.Read<int>(offset) == 1;
                        }
                    }
                    ImGui.Text($"In Menu: {playerInMenu}");
                    */
                    ImGui.Text($"Move: {player.Move}, Fix: {player.Fix}");
                }
                ImGui.PopID();

                ImGui.Separator();

                ImGui.PushID("Pad");
                ImGui.Text("Pad:");
                ImGui.Text($"Pointer: {sMhSteamController.Instance:x}");
                int PadRx = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b0);
                int PadRy = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b4);
                int PadLx = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b8);
                int PadLy = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1bc);
                byte PadRz = MemoryUtil.Read<byte>(sMhSteamController.Instance + 0x1c0);
                byte PadLz = MemoryUtil.Read<byte>(sMhSteamController.Instance + 0x1c1);
                ImGui.Text("Left Stick:");
                ImGui.Text($" X: {PadLx}");
                ImGui.Text($" Y: {PadLy}");
                ImGui.Text($" L2: {PadLz}");
                ImGui.Text("Right Stick:");
                ImGui.Text($" X: {PadRx}");
                ImGui.Text($" Y: {PadRy}");
                ImGui.Text($" R2: {PadRz}");
                ImGui.PopID();
            }
            ImGui.PopID();
        }

        public void OnUpdate(float deltaTime)
        {
            if (modDisabled) return;

            Viewport vp = CameraSystem.MainViewport;
            Camera? camera = vp.Camera;
            if (camera == null) return;

            Player? player = Player.MainPlayer;
            if (player != null)
            {
                if (offsetPerspective && player != lastPlayer)
                {
                    // Update target camera on player change.
                    targetCamera = camera;
                    previousFov = -1.0f;
                }
                lastPlayer = player;
                if (toggleOffsetPerspective && !offsetPerspective)
                {
                    offsetPerspective = true;
                    targetCamera = camera;
                    previousFov = -1.0f;
                }
                else if (!toggleOffsetPerspective && offsetPerspective)
                {
                    offsetPerspective = false;
                    targetCamera = null;
                }
            }

            if (!modToggleDisabled && (!Input.IsPressed(Button.R3) && Input.IsDown(Button.R3)) && Input.IsPressed(Button.L2))
            {
                toggleFreeCamera = !toggleFreeCamera;
            }

            if (freeCamera)
            {
                if (!unlockMovementHeld && Input.IsPressed(Button.R2))
                {
                    unlockMovementHeld = true;
                }
                else if (unlockMovementHeld && Input.IsReleased(Button.R2))
                {
                    unlockMovementHeld = false;
                }

                if (unlockMovementHeld && Input.IsPressed(Button.L1))
                {
                    unlockMovementToggled = !unlockMovementToggled;
                }

                if (Input.IsDown(Button.R2))
                {
                    if (Input.IsDown(Button.L2))
                    {
                        if (unlockMovementHeld)
                        {
                            unlockMovementHeld = false;
                        }
                        if (unlockMovementToggled)
                        {
                            unlockMovementToggled = false;
                        }
                    }
                    else if (Input.IsReleased(Button.L2))
                    {
                        unlockMovementHeld = true;
                    }
                }

                if (Input.IsDown(Button.L2) && Input.IsDown(Button.R2))
                {
                    int PadLy = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1bc);
                    if (Math.Abs(PadLy) < stickDeadzone) PadLy = 0;
                    double adjustedZoomSpeed = cameraZoomSpeed * (deltaTime * cameraFov);
                    double Ly = PadLy / (Int16.MaxValue / adjustedZoomSpeed);
                    cameraFov = Math.Clamp(cameraFov - Ly, 1.0, 179.0);
                }
                else if (!(unlockMovementHeld || unlockMovementToggled))
                {
                    int PadLy = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1bc);
                    if (Math.Abs(PadLy) < stickDeadzone) PadLy = 0;
                    int PadLx = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b8);
                    if (Math.Abs(PadLx) < stickDeadzone) PadLx = 0;
                    double adjustedSpeed = cameraSpeed * (deltaTime * 100.0);
                    double Lx = PadLx / (Int16.MaxValue / adjustedSpeed);
                    double Ly = PadLy / (Int16.MaxValue / adjustedSpeed);
                    Quaternion forward = getForward(camera.Position, camera.Target);
                    double buttonOffset = adjustedSpeed / 2.0;
                    if (Input.IsDown(Button.L2))
                    {
                        buttonOffset *= cameraSpeedModifier;
                        Lx *= cameraSpeedModifier;
                        Ly *= cameraSpeedModifier;
                        forward.Y = 0.0f;
                    }
                    if (Input.IsDown(Button.Down))
                    {
                        camera.Position.Y -= (float)buttonOffset;
                    }
                    if (Input.IsDown(Button.Up))
                    {
                        camera.Position.Y += (float)buttonOffset;
                    }
                    if (Input.IsDown(Button.Left))
                    {
                        cameraRoll -= buttonOffset;
                    }
                    if (Input.IsDown(Button.Right))
                    {
                        cameraRoll += buttonOffset;
                    }
                    forward = Quaternion.Normalize(forward);
                    Quaternion left = forward * Quaternion.CreateFromRotationMatrix(Matrix4x4.CreateRotationY(Single.DegreesToRadians(180.0f)));
                    camera.Position.X += (float)(left.X * Lx);
                    camera.Position.Z += (float)(left.Z * Lx);
                    camera.Position.X += (float)(forward.X * Ly);
                    camera.Position.Y += (float)(forward.Y * Ly);
                    camera.Position.Z += (float)(forward.Z * Ly);
                }
                int PadRx = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b0);
                if (Math.Abs(PadRx) < stickDeadzone) PadRx = 0;
                int PadRy = MemoryUtil.Read<int>(sMhSteamController.Instance + 0x1b4);
                if (Math.Abs(PadRy) < stickDeadzone) PadRy = 0;
                double adjustedSensitivity = cameraSensitivity * (deltaTime * cameraFov);
                double Rx = PadRx / (Int16.MaxValue / adjustedSensitivity);
                double Ry = PadRy / (Int16.MaxValue / adjustedSensitivity);
                cameraYaw += Rx;
                cameraPitch = Math.Clamp(cameraPitch + Ry, -cameraPitchLimit, cameraPitchLimit);
                // This is the same value the game uses for the player camera. Oddly the in-game view mode
                // uses 1.0 like I did here before, which is really bad for precision.
                double dist = 700.0 - cameraForward;
                camera.Target.X = camera.Position.X + (float)(dist * Math.Cos(Double.DegreesToRadians(cameraPitch)) * Math.Cos(Double.DegreesToRadians(cameraYaw)));
                camera.Target.Y = camera.Position.Y + (float)(dist * Math.Sin(Double.DegreesToRadians(cameraPitch)));
                camera.Target.Z = camera.Position.Z + (float)(dist * Math.Cos(Double.DegreesToRadians(cameraPitch)) * Math.Sin(Double.DegreesToRadians(cameraYaw)));
                camera.FieldOfView = (float)cameraFov;
                if (!toggleFreeCamera)
                {
                    freeCamera = false;
                    camera.Move = true;
                    if (preZoomFov != null)
                    {
                        cameraFov = (double)preZoomFov;
                        preZoomFov = null;
                    }
                    if (preZoomRoll != null)
                    {
                        cameraRoll = (double)preZoomRoll;
                        preZoomRoll = null;
                    }
                }
                maybeSetFovForCulling(vp, camera);
            }
        }
    }
}