using System;
using UnityEngine;
using UnityEngine.UI;

namespace Comp
{
    public class CockHpComp : MonoBehaviour
    {
        // 血量条组件
        private Image _backgroundImage, _foregroundImage;

        private int _maxHp, _curHp;

        public int reduceHp; // 需要扣除的Hp
        
        private ParticleSystem _particleSystem;

        public int MaxHp
        {
            set
            {
                _maxHp = value;
                _curHp = _maxHp;
            }
        }

        private void ReduceCurHp(int hp)
        {
            _curHp -= hp;
            var hpPercent = (float)_curHp / _maxHp;
            if (hpPercent > 0.5f)
            {
                _foregroundImage.color = Color.green;
            }
            else if (hpPercent is >= 0.25f and <= 0.5f)
            {
                _foregroundImage.color = Color.yellow;
            }
            else
            {
                _foregroundImage.color = Color.red;
            }
            
            var backgroundSize = _backgroundImage.rectTransform.sizeDelta;
            var foregroundSize = _foregroundImage.rectTransform.sizeDelta;
            var newForegroundWidth = backgroundSize.x * hpPercent;
            _foregroundImage.rectTransform.sizeDelta = new Vector2(newForegroundWidth, foregroundSize.y);
            
            _particleSystem.Play(); // 播放粒子特效
        }
        
        private void Awake()
        {
            _particleSystem = GetComponentInChildren<ParticleSystem>();
        }

        private void Start()
        {
            // 获取血条的填充图片
            var images = GetComponentsInChildren<Image>();
            foreach (var image in images)
            {
                if (image.name == "Background")
                {
                    _backgroundImage = image;
                }

                if (image.name == "Foreground")
                {
                    _foregroundImage = image;
                }
            }
        }

        private void Update()
        {
            if (reduceHp != 0)
            {
                ReduceCurHp(reduceHp);
                reduceHp = 0;
            }
        }
    }
}