using System;
using System.Diagnostics;
using Godot;

namespace BITKit;
public partial class FreeLookCamera : Node3D,IVirtualCamera
{
    [Export]
    private int fov;
    [Export]
    private bool isEnabled;

    [Export] 
    private Curve wheelCurve;

    [Export(PropertyHint.Range,"0.32,8")]
    private float distance;

    [Export] private float maxDistance;

    [Export]
    private StringResource stringResource;
    
    private Vector3 rotation;
    private Vector3 position;
    void IActivable.SetActive(bool active) => isEnabled = active;
    int IVirtualCamera.FOV => fov;
    bool IVirtualCamera.IsEnabled => isEnabled;
    // ReSharper disable once ConvertToAutoProperty
    Vector3 IVirtualCamera.Rotation =>rotation ;
    // ReSharper disable once ConvertToAutoProperty
    Vector3 IVirtualCamera.Position => position;

    private Vector3 eulur;

    private bool isMoving;
    public override void _Ready()
    {
        eulur = Rotation;
        position = Position;
        CameraService.Register(this);
    }

    protected override void Dispose(bool disposing)
    {
        CameraService.UnRegister(this);
    }

    public override void _Process(double delta)
    {
        var _rot = Quaternion.FromEuler(eulur);
        var _dir = _rot * Vector3.Forward * distance;
        var newPos = Position - _dir;
        position = position.Lerp(newPos, 1);

        rotation = rotation.Lerp(eulur, 1);

        BITAppForGodot.AllowCursor.SetDisableElements(this,Input.IsMouseButtonPressed(MouseButton.Middle));

        isMoving = Input.IsKeyPressed(Key.Shift);
    }

    public override void _Input(InputEvent @event)
    {
        
        switch (@event)
        {
            case InputEventMouseMotion mouseMotion:
                if(Input.IsMouseButtonPressed(MouseButton.Middle) is false)break;
                if (isMoving)
                {
                    var velocity = mouseMotion.Relative;
                    Position +=
                        Quaternion.FromEuler(eulur) * 
                        new Vector3() 
                    {
                        X= -velocity.X,
                        Y = velocity.Y
                    } * (float)GetProcessDeltaTime();
                }
                else
                {
                    var mouseVelocity = mouseMotion.Relative /* 0.022f*/ * 1.81f * (float)GetProcessDeltaTime();
                    eulur.X -= mouseVelocity.Y;
                    eulur.Y -= mouseVelocity.X;
                    eulur.Y %= 360;

                    eulur.X = Math.Clamp(eulur.X, -80, 80);
                }
               
                break;
            case InputEventMouseButton mouseButton:
                var delta =(float) GetProcessDeltaTime() * wheelCurve.Sample(distance*0.1f);
                switch (mouseButton.ButtonIndex)
                {
                    case MouseButton.WheelUp:
                        distance -= delta;
                        break;
                    case MouseButton.WheelDown: 
                        distance += delta;
                        break;
                    default:
                        break;
                }
                distance = Math.Clamp(distance,0, maxDistance);
                break;
        }
    }
}