using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using UnityEngine.SceneManagement;
/* 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.GetComponent<Camera>().enabled = false;
    }

    void Start()
    {
        if (SceneManager.GetActiveScene().name == "Game") {
            if (arrow.canUseSideCamera) {
                arrowCameraTemplate = new ArrowCameraTemplate2(this);
            } else {
                arrowCameraTemplate = new ArrowCameraTemplate1(this);  
            }
        } else if (SceneManager.GetActiveScene().name == "Demo_Day") {
            arrowCameraTemplate = new ArrowCameraTemplate3(this);  
        }
    }

    void OnDestroy()
    {
        try
        {
            BowCamera.ins.GetComponent<Camera>().enabled = true;
        }
        catch (System.Exception) {}
    }

    void FixedUpdate()
    {
        arrowCameraTemplate.Update(); 
    }
}
/* 模板3：跟着箭飞_打猎场景 */
class ArrowCameraTemplate3 : ArrowCameraTemplate 
{
    public ArrowCameraTemplate3(ArrowCamera arrowCamera)  : base(arrowCamera) {
        this.arrowCamera.arrow.activeEffectCyclone(true);
    }
    
    private bool cameraMoveFinish = false;

    Vector3 cameraToRunPosition = new Vector3(0.4f, 0.5f, -1 - Mathf.Clamp(Arrow.speed / 20 * 6, 0, 6));
    Vector3 cameraFinalPosition = new Vector3(0.4f, 0.8f, -5f);

    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 * 6);
            float d = Vector3.Distance(cameraPosition, cameraFinalPosition);
            if (d < 0.001f) {
                cameraMoveFinish = true;
                Sequence seq = DOTween.Sequence();
                seq.AppendInterval(1f);
                seq.AppendCallback(delegate() {
                    this.arrowCamera.arrow.nextShoot();
                    this.arrowCamera.arrow.enabled = false;
                    GameObject.Destroy(container?container:this.arrowCamera.gameObject);
                });
            }
        } else {
            cameraPosition = Vector3.Lerp(cameraPosition, cameraToRunPosition, Time.deltaTime * 6);
            cameraT.LookAt(this.arrowCamera.arrow.Head());
        }
        cameraT.localPosition = cameraPosition;
        
    }
    GameObject container = null;
    public override void beforeHit() {
        //把镜头从箭中移除，放到一个固定的容器里，免得随着动物抖动
        if (!container) {
            container = new GameObject("CameraContainer");
            container.transform.position = this.arrowCamera.arrow.transform.position;
            container.transform.rotation = this.arrowCamera.arrow.transform.rotation;
            this.arrowCamera.transform.SetParent(container.transform);
        }
    }
}
/* 模板2：从侧面看箭飞 */
class ArrowCameraTemplate2 : ArrowCameraTemplate 
{
    public ArrowCameraTemplate2(ArrowCamera arrowCamera)  : base(arrowCamera) {
        this.arrowCamera.transform.parent = null;
        arrowCamera.transform.localPosition = new Vector3(8.33f, 2.45f, 6.4f);
        arrowCamera.transform.localEulerAngles = new Vector3(0, -42, 0);
    }

    bool isHit = false;
    public override void Update() {
        if (!isHit) {
            isHit = arrowCamera.arrow.isHit;
            if (isHit) {
                this.arrowCamera.transform.SetParent(this.arrowCamera.arrow.transform);
                arrowCamera.transform.localPosition = new Vector3(-0.6f, 0.1f, -0.8f);
                arrowCamera.transform.LookAt(this.arrowCamera.arrow.Head());
                Sequence seq = DOTween.Sequence();
                seq.PrependInterval(2.2f);
                seq.AppendCallback(delegate() {
                    this.arrowCamera.arrow.nextShoot();
                    this.arrowCamera.arrow.enabled = false;
                    GameObject.Destroy(this.arrowCamera.gameObject);
                });
                return;
            }
        }
        if (!arrowCamera.arrow) {
            GameObject.Destroy(this.arrowCamera.gameObject);
        }
    }
}
/* 模板1：跟着箭飞 */
class ArrowCameraTemplate1 : ArrowCameraTemplate 
{
    public ArrowCameraTemplate1(ArrowCamera arrowCamera)  : base(arrowCamera) {
        this.arrowCamera.arrow.activeEffectCyclone(true);
    }
    
    /**相机移动 */
    private bool cameraMoveFinish = false;
    //相机的位置xyz变化 【每秒变化量，最小值，最大值】
    private float[] cpcs = {
        //运动中
        6, 0, 0.4f,
        6, 0, 0.2f,
        -18f, -1 - Mathf.Clamp(Arrow.speed / 20 * 6, 0, 6), 0,
        //击中后
        -3.5f, -0.6f, 0.4f,
        -3.5f, 0.1f, 0.2f,
        30, -1 - Mathf.Clamp(Arrow.speed / 20 * 6, 0, 6), -0.8f
    };

    public override void Update() {
        if (cameraMoveFinish) {
            return;
        }
        Transform cameraT = this.arrowCamera.transform;
        Vector3 cameraPosition = cameraT.localPosition;
        if (this.arrowCamera.arrow.isHit) {
            cameraPosition.x = Mathf.Clamp(cameraPosition.x + this.cpcs[9] * Time.deltaTime, this.cpcs[10], this.cpcs[11]);
            cameraPosition.y = Mathf.Clamp(cameraPosition.y + this.cpcs[12] * Time.deltaTime, this.cpcs[13], this.cpcs[14]);
            cameraPosition.z = Mathf.Clamp(cameraPosition.z + this.cpcs[15] * Time.deltaTime, this.cpcs[16], this.cpcs[17]);
            float d = Vector3.Distance(cameraPosition, new Vector3(
                this.cpcs[9] < 0 ? this.cpcs[10]: this.cpcs[11], 
                this.cpcs[12] < 0 ? this.cpcs[13]: this.cpcs[14], 
                this.cpcs[15] < 0 ? this.cpcs[16]: this.cpcs[17]
            ));
            if (d < 0.001f) {
                cameraMoveFinish = true;
                Sequence seq = DOTween.Sequence();
                seq.AppendInterval(2.2f);
                seq.AppendCallback(delegate() {
                    this.arrowCamera.arrow.nextShoot();
                    this.arrowCamera.arrow.enabled = false;
                    GameObject.Destroy(this.arrowCamera.gameObject);
                });
            }
        } else {
            cameraPosition.x = Mathf.Clamp(cameraPosition.x + this.cpcs[0] * Time.deltaTime, this.cpcs[1], this.cpcs[2]);
            cameraPosition.y = Mathf.Clamp(cameraPosition.y + this.cpcs[3] * Time.deltaTime, this.cpcs[4], this.cpcs[5]);
            cameraPosition.z = Mathf.Clamp(cameraPosition.z + this.cpcs[6] * Time.deltaTime, this.cpcs[7], this.cpcs[8]);
        }
        cameraT.localPosition = cameraPosition;
        cameraT.LookAt(this.arrowCamera.arrow.Head());
    }
}
public class ArrowCameraTemplate {
    public ArrowCamera arrowCamera;
    public ArrowCameraTemplate(ArrowCamera arrowCamera)
    {
        this.arrowCamera = arrowCamera;
    }
    public virtual void Update() {}
    public virtual void beforeHit() {}
}