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

public class BulletObject : MonoBehaviour
{
    private bool initialied = false;

    [SerializeField] private Vector2 startPos;
    private Vector2 midPos;
    private float percent = 0;
    private float percentSpeed = 0;
    [SerializeField] private float speed = 25;


    private Vector2 lastTargetPos;



    // Update is called once per frame
    void FixedUpdate()
    {
        if (initialied )
        {
            percent += percentSpeed * Time.deltaTime;
            if (percent >= 1)
            {
                percent = 1;
            }
            transform.position = UnityExpandFunction.Bezier(percent, startPos, midPos, lastTargetPos);
        }
        if(transform.position==new Vector3(lastTargetPos.x, lastTargetPos.y,0))
        {
            Destroy(this.gameObject);
        }
      
    }
    public void Init(GameObject parent)
    {
        GameObject player = GameObject.FindGameObjectWithTag("Player");
        if(player!=null)
        {
            lastTargetPos = player.transform.position;

            startPos = parent.transform.position+new Vector3(Random.Range(0,2), Random.Range(0, 2),0);

            midPos = GetMiddlePostion(parent.transform.position, lastTargetPos);

            percentSpeed = speed / (lastTargetPos - startPos).magnitude;

            transform.position = startPos;

            percent = 0;
            initialied = true;
        }
    }


    /// <summary>
    /// 中心点
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <returns></returns>
    private Vector2 GetMiddlePostion(Vector2 a, Vector2 b)
    {
        Vector2 m = Vector2.Lerp(a,b,0.1f);
        Vector2 normal = Vector2.Perpendicular(a-b).normalized;

        float rd = Random.Range(-2f,2f);
        float curveRatio = 15f;//偏移值

        return m + (a - b).normalized * curveRatio * rd * normal;
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.CompareTag("Player"))
        {
            if (collision.gameObject.GetComponentInChildren<CombaSystem>()._animator.CheckAnimationTag("Roll"))
                return;
            Debug.Log("击中");
            collision.gameObject.GetComponentInChildren<CombaSystem>().TakeDamage(20);
        }
    }
}