OldBlueWater/BlueWater/Assets/02.Scripts/Ui/HpSlider.cs

using System.Collections;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.UI;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class HpSlider : MonoBehaviour
    {
        [SerializeField] private Transform target;
        [SerializeField] private Slider slider;
        [SerializeField] private Slider damageEffectSlider;
        [SerializeField] private float duration = 2f;
        [SerializeField] private Vector3 offset = Vector3.up;

        [Button("셋팅 초기화")]
        private void Init()
        {
            slider = GetComponent<Slider>();
            damageEffectSlider = transform.Find("Fill Area/Background/DamageEffectSlider").GetComponent<Slider>();
        }

        private void Update()
        {
            if (!target) return;

            transform.position = target.TransformPoint(offset);
        }

        public void SetHpSlider(Transform target, float maxHp)
        {
            if (!slider || !damageEffectSlider) return;

            this.target = target;
            
            slider.maxValue = maxHp;
            damageEffectSlider.maxValue = maxHp;

            slider.value = maxHp;
            damageEffectSlider.value = maxHp;

            SetActiveHpSlider(true);
        }
        
        public void UpdateHpSlider(float value)
        {
            if (!slider || !damageEffectSlider) return;
            
            StartCoroutine(DamageEffect(value));
        }
        
        private IEnumerator DamageEffect(float value)
        {
            var previousHp = slider.value;
            var tick = (previousHp - value) / duration;
            
            slider.value = value;
            
            while (damageEffectSlider.value > value)
            {
                damageEffectSlider.value -= tick * Time.deltaTime;
                yield return null;
            }

            damageEffectSlider.value = value;
        }

        public void SetActiveHpSlider(bool value) => gameObject.SetActive(value);
    }
}