using UnityEngine;
using DG.Tweening;

/* 拍摄箭飞行的摄像机 */
public class ArrowCamera : MonoBehaviour
{
    [System.NonSerialized] public Arrow arrow;
    [System.NonSerialized] public ArrowCameraTemplate arrowCameraTemplate;

    void Awake()
    {
        BowCamera.ins.SetArrowFollowing(true);
    }

    void Start()
    {
       arrowCameraTemplate = new ArrowCameraTemplate1(this);  
    }

    void OnDestroy()
    {
        try { BowCamera.ins.SetArrowFollowing(false); } catch (System.Exception) {}
    }

    void FixedUpdate()
    {
        arrowCameraTemplate.Update(); 
    }
}
/* 模板1：跟着箭飞 */
class ArrowCameraTemplate1 : ArrowCameraTemplate 
{
    public ArrowCameraTemplate1(ArrowCamera arrowCamera)  : base(arrowCamera) {
        this.arrowCamera.arrow.activeEffectCyclone(true);
    }
    
    private bool cameraMoveFinish = false;
    Vector3 cameraToRunPosition = new Vector3(0.4f, 0.3f, -1 - Mathf.Clamp(Arrow.speed / 20 * 6, 0, 6));
    Vector3 cameraFinalPosition = new Vector3(-0.3f, 0.2f, -1.3f);

    public override void Update() {
        if (cameraMoveFinish) {
            return;
        }
        Transform cameraT = this.arrowCamera.transform;
        Vector3 cameraPosition = cameraT.localPosition;
        if (this.arrowCamera.arrow.isHit) {
            cameraPosition = Vector3.Lerp(cameraPosition, cameraFinalPosition, Time.deltaTime * 8);
            float d = Vector3.Distance(cameraPosition, cameraFinalPosition);
            if (d < 0.001f) {
                cameraMoveFinish = true;
                Sequence seq = DOTween.Sequence();
                seq.AppendInterval(2.2f);
                seq.AppendCallback(delegate() {
                    this.arrowCamera.arrow.nextShoot();
                    GameObject.Destroy(this.arrowCamera.gameObject);
                });
            }
        } else {
            cameraPosition = Vector3.Lerp(cameraPosition, cameraToRunPosition, Time.deltaTime * 6);
        }
        cameraT.LookAt(this.arrowCamera.arrow.Head());
        cameraT.localPosition = cameraPosition;
    }
}
public class ArrowCameraTemplate {
    public ArrowCamera arrowCamera;
    public ArrowCameraTemplate(ArrowCamera arrowCamera)
    {
        this.arrowCamera = arrowCamera;
    }
    public virtual void Update() {}
    public virtual void beforeHit() {}
    public virtual void SendMsg(int id, object msg) {}
}