using System;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.Serialization;

public interface IResettableSettingValue{
    public void Verify();
    public void SmoothAndEase();
    public void Initialize();
}

[Serializable]
public class SettingValue<T> : IResettableSettingValue{
    [HorizontalGroup("Settings", width: .3f), VerticalGroup("Settings/Value"), BoxGroup("Settings/Value/Value"), LabelText("Target")]
        public T targetValue;
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Value"), BoxGroup("Settings/Value/Value"), LabelText("Current")]
        public T currentValue;
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Smoothing"), BoxGroup("Settings/Smoothing/Smoothing"), LabelText("Target"), ShowIf("@IsSmoothable()")]
        public float targetSmoothing; // Smoothing changes how fast the value is changed.
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Easing"), BoxGroup("Settings/Easing/Easing"), LabelText("Target"), ShowIf("@IsSmoothable()")]
        public float targetEasing; // Easing changes how fast smoothing is changed, when given a new value.
    
    public T Value{
        get => currentValue;
        set{
            if (IsSmoothable()) {
                targetValue = value;        
            } else {
                currentValue = value;
                targetValue = value;
            }
        }
    }

    [HorizontalGroup("Settings"), VerticalGroup("Settings/Smoothing"), BoxGroup("Settings/Smoothing/Smoothing"), LabelText("Current"), ShowIf("@IsSmoothable()")]
    public float currentSmoothing;
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Value"), BoxGroup("Settings/Value/Value"), LabelText("Default")]
    public T defaultValue;
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Smoothing"), BoxGroup("Settings/Smoothing/Smoothing"), LabelText("Default"), ShowIf("@IsSmoothable()")]
    public float defaultSmoothing;
    [HorizontalGroup("Settings"), VerticalGroup("Settings/Easing"), BoxGroup("Settings/Easing/Easing"), LabelText("Default"), ShowIf("@IsSmoothable()")]
    public float defaultEasing;

    private float refVelFloat; // For use with SmoothDamp
    private Vector3 refVelV3; // For use with SmoothDamp
    private Vector2 refVelV2; // For use with SmoothDamp

    private bool verified;

    bool IsSmoothable(){
        return (typeof(T) == typeof(float) || typeof(T) == typeof(Vector2) || typeof(T) == typeof(Vector3) || typeof(T) == typeof(Vector4) || typeof(T) == typeof(Quaternion) );
    } 
    
    public SettingValue(T initValue, float defaultEasing = 2f, float defaultSmoothing = 1f){
        targetValue = initValue;
        
        defaultValue = initValue;
        
        this.defaultSmoothing = defaultSmoothing;
        this.defaultEasing = defaultEasing;
        
        targetEasing = defaultEasing;
        targetSmoothing = defaultSmoothing;
        
        currentSmoothing = targetSmoothing;
        currentValue = targetValue;
        
        refVelFloat = 0;
        refVelV3 = default;
        refVelV2 = default;
    }

    public void Verify(){
        if (targetValue.Equals(currentValue) == false) {
            Debug.LogWarning($"A SettingValue ({this}) doesn't have its current and target value matching. This should have been set!");
        }

        verified = true;
    }

    public void SmoothAndEase(){
        if (!verified) {
            Debug.LogWarning($"A SettingValue ({this}) wasn't verified before being smoothed and eased. What's up with that?");
        }
        
        currentSmoothing = Mathf.MoveTowards(currentSmoothing, targetSmoothing, targetEasing * targetEasing * Time.deltaTime);
        
        if (typeof(T) == typeof(float)) {
            currentValue = (T)(object)Mathf.SmoothDamp((float)(object)currentValue, (float)(object)targetValue, ref refVelFloat, currentSmoothing * Time.deltaTime);
        } 
        
        if (typeof(T) == typeof(Vector2)) {
            currentValue = (T)(object)Vector2.SmoothDamp((Vector2)(object)currentValue, (Vector2)(object)targetValue, ref refVelV2, currentSmoothing * currentSmoothing * Time.deltaTime);
        } 
        
        if (typeof(T) == typeof(Vector3)) {
            currentValue = (T)(object)Vector3.SmoothDamp((Vector3)(object)currentValue, (Vector3)(object)targetValue, ref refVelV3, currentSmoothing * currentSmoothing * Time.deltaTime);
        } 
        
        if (typeof(T) == typeof(Vector4) || typeof(T) == typeof(Quaternion)) {
            // I have... zero clue if this will work. There is no Vector4 or Quaternion SmoothDamp
            Vector3 v3value = Vector3.SmoothDamp((Vector4)(object)currentValue, (Vector4)(object)targetValue, ref refVelV3, currentSmoothing * currentSmoothing * Time.deltaTime);
            float v4value = Mathf.SmoothDamp(((Vector4)(object)currentValue).z, ((Vector4)(object)targetValue).z, ref refVelFloat, currentSmoothing * currentSmoothing * Time.deltaTime);
            
            currentValue = (T)(object)new Vector4(v3value.x, v3value.y, v3value.z, v4value);
        }
    }
    
    public void Initialize(){
        currentValue = targetValue;
        defaultValue = targetValue;
        defaultSmoothing = targetSmoothing;
        defaultEasing = targetEasing;
        currentSmoothing = targetSmoothing;
    }
}