using System;
using System.Collections;
using TMPro;
using UnityEngine;
using UnityEngine.PlayerLoop;

namespace Comp
{
    public class MissText : MonoBehaviour
    {
        private Transform _targetObject; // 目标物体

        private const float Speed = 0.3f; // 移动速度

        private const float High = 0.7f;

        // 淡出相关

        private TextMeshPro _textMeshPro;

        private const float FadeTime = 1f;

        private float _timePassed = 0f;

        public void SetTarget(Transform transform)
        {
            _targetObject = transform;
            var position = transform.position;
            this.transform.position = new Vector3(position.x, High, position.z);
        }

        private void Start()
        {
            _textMeshPro = GetComponent<TextMeshPro>();
        }

        public void FixedUpdate()
        {
            if (_targetObject != null)
            {
                var position = _targetObject.position;
                var position1 = transform.position;
                transform.Translate(new Vector3(position.x - position1.x,
                    Vector3.up.y * (Speed * Time.deltaTime), position.z - position1.z));
            }

            // 计算当前已经过去的时间
            _timePassed += Time.deltaTime;
            // 计算当前的透明度
            float alpha = Mathf.Lerp(1f, 0f, _timePassed / FadeTime);
            _textMeshPro.alpha = alpha;
            // 如果透明度已经为0，就销毁游戏对象
            if (alpha <= 0f)
            {
                Destroy(gameObject);
            }
        }
    }
}