using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class RainbowColor : MonoBehaviour
{
    [SerializeField] private float _hueShiftSpeed = 0.1f;
    [SerializeField, Range(0,1)] private float _saturation = 1f;
    [SerializeField, Range(0,1)] private float _value = 1f;
    private Image _button;

    public bool GoRainbow;

    void Start()
    {
        _button = GetComponent<Image>();
    }
    void Update()
    {
        if (!GoRainbow) return;

        float amountToShift = _hueShiftSpeed * 0.01f;
        Color newColor = ShiftHueBy(_button.color, amountToShift);
        _button.color = newColor;
    }

    private Color ShiftHueBy(Color color, float amount)
    {
        Color.RGBToHSV(color, out float hue, out float sat, out float val);
        hue += amount;
        sat = _saturation;
        val = _value;
        return Color.HSVToRGB(hue, sat, val);
    }
}