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

public class Bar : MonoBehaviour
{
    [SerializeField] private float _speed;
    [SerializeField] private ParticleSystem _flameEffect;
    [SerializeField] private Image _fillImage;
    [SerializeField] private Gradient _gradient;

    private Slider _slider;
    private float _value;
    private bool _isFlameStop = true;

    private void Start()
    {
        _slider = GetComponent<Slider>();
        _slider.onValueChanged.AddListener(ValueChanged);
        _value = _slider.value;
        _fillImage.color = _gradient.Evaluate(0f);
    }

    public void ChangeValue(float value)
    {
        _value = value;
        ChangeColor();
        MoveSlider();
    }

    private void ChangeColor()
    {
        _fillImage.color = _gradient.Evaluate(1f - _slider.normalizedValue);
    }

    private void MoveSlider()
    {
        if (_slider.normalizedValue <= 0.01f)
        {
            HideSlider();
            return;
        }
        _slider.value = Mathf.MoveTowards(_slider.value, _value, _speed);
    }

    private void HideSlider()
    {
        _flameEffect.Stop();
        _fillImage.color = Color.black;
    }

    private void ValueChanged(float value)
    {
        if (_isFlameStop)
        {
            _flameEffect.Play();
            _isFlameStop = !_isFlameStop;
        }
    }
}