using System;
using UnityEngine;

public class MoveWithCurve : MonoBehaviour
{
    [HideInInspector]
    public Vector3 EndPoint = new Vector3();
    [Tooltip("x轴路线形状 起始和结尾 点值必须为0")]
    public AnimationCurve CurveX;
    [Tooltip("y轴路线形状 起始和结尾 点值必须为0")]
    public AnimationCurve CurveY;
    [Tooltip("z轴路线形状 起始和结尾 点值必须为0")]
    public AnimationCurve CurveZ;
    [Tooltip("y轴运动速度 结尾点值必须为1")]
    public AnimationCurve CurveSpeedY;
    [Tooltip("z轴运动速度 结尾点值必须为1")]
    public AnimationCurve CurveSpeedZ;
    [Tooltip("弧度缩放系数")]
    public float RadianScale     = 1f;
    
    private float _duration      = 0.5f;
    private float _elapsedTime   = 0f;
    private Vector3 _startPoint  = Vector3.zero;

    private bool _begin          = false;
    private Action _effectOver;

    public void Begin(Action callBack)
    {
        _begin = true;
        _elapsedTime = 0;
        _effectOver = callBack;
    }

    void Start()
    {
  
        if (CurveX.length > 0)
        {
            float startTime = CurveX.keys[0].time;
            float endTime = CurveX.keys[CurveX.length - 1].time;
            _duration = endTime - startTime;
        }

        Update();
    }

    public void SetStartPosition(Vector3 value)
    {
        _startPoint = value;
    }
    
    void Update()
    {
        if (!_begin) return;
        _elapsedTime += Time.deltaTime;
        if (_elapsedTime > _duration)
        {
            _elapsedTime = _duration;
            _begin = false;
            _effectOver?.Invoke();
        }

        Vector3 l = Vector3.Lerp(_startPoint, EndPoint, _elapsedTime/_duration);
        float speedY = CurveSpeedY != null?CurveSpeedY.Evaluate(_elapsedTime):1;
        float speedZ = CurveSpeedZ != null?CurveSpeedZ.Evaluate(_elapsedTime):1;
        // 使用曲线计算位置

        float newX = CurveX.Evaluate(_elapsedTime) * RadianScale + l.x;
        float newY = CurveY.Evaluate(_elapsedTime) * RadianScale * speedY + l.y;
        float newZ = CurveZ.Evaluate(_elapsedTime) * RadianScale * speedZ + l.z;
        transform.position = new Vector3(newX, newY, newZ);
    }
    

}