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

/**瞄准器负载检测 */
public class AimLoadChecker : MonoBehaviour
{
    [SerializeField] GameObject outTip;

    void Update()
    {
        bool needActiveOutTip = false;
        if (ArmBow.ins && ArmBow.ins.IsCanShoot() && TargetBody.ins) {
            RaycastHit ray = CrossHair.ins.GetRaycastHit();
            if (ray.transform && ray.transform.gameObject.name == "TargetBody") {
                float mySpeed = Arrow.speed;
                if (GameAssistUI.ins) {
                    mySpeed *= GameAssistUI.ins.shootScaleValue;
                } 
                Vector3 destination = ray.point;
                Vector3 startPoint = BowCamera.ins.transform.position;
                float deltaX = Mathf.Sqrt(
                    Mathf.Pow(destination.x - startPoint.x, 2) +
                    Mathf.Pow(destination.z - startPoint.z,2)
                );
                float deltaY = destination.y - startPoint.y;
                float a = 0.5f * Physics.gravity.y * Mathf.Pow(deltaX, 2) / Mathf.Pow(mySpeed, 2);
                float b = deltaX;
                float c = a - deltaY;
                bool hasParabolaAngle = Mathf.Pow(b, 2) - 4 * a * c >= 0;
                if (hasParabolaAngle) {
                    float res1 = (-b + Mathf.Pow(Mathf.Pow(b, 2) - 4*a*c, 0.5f)) / (2 * a);
                    float res2 = (-b - Mathf.Pow(Mathf.Pow(b, 2) - 4*a*c, 0.5f)) / (2 * a);
                    float parabolaAngle = Mathf.Min(Mathf.Atan(res1), Mathf.Atan(res2)) / Mathf.PI * 180;

                    needActiveOutTip = parabolaAngle > 5;               
                }
            }
        }
        ActiveOutTip(needActiveOutTip);
    }

    public void ActiveOutTip(bool value) 
    {
        if (outTip.activeSelf != value) {
            outTip.SetActive(value);
        }
    }
}