using System;
using UnityEngine;
using UnityEngine.EventSystems;
/* 弓的相机 */
public class BowCamera : MonoBehaviour
{
    //相机组件
    Camera _cameraComp;
    Camera cameraComp {
        get {
            if (!_cameraComp) _cameraComp = GetComponent<Camera>();
            return _cameraComp;
        }
    }
    //控制的手臂弓
    ArmBow _armBow;
    ArmBow armBow {
        get {
            if (!_armBow) _armBow = GetComponentInChildren<ArmBow>();
            return _armBow;
        }
    }
    //本地欧拉角记录值
    Vector3 localEulerAngles;
    //触摸检测器
    JC.Unity.TouchChecker touchChecker = new JC.Unity.TouchChecker();
    //触摸模式开关
    private static bool _isTouchMode = true;
    public static bool isTouchMode {
        get {
            if (CommonConfig.isReleaseVersion) return false;
            return _isTouchMode;
        }
        set {
            _isTouchMode = value;
        }
    }
    //禁止逻辑，只用于同步状态和渲染，目前用于联机
    [NonSerialized] public bool banLogic = false;
    private static BowCamera _ins;
    public static BowCamera ins {
        get {
            if (!_ins) {
                _ins = GameObject.FindObjectOfType<BowCamera>();
            }
            return _ins;
        }
    }

    void Awake() {
        _ins = this;
        localEulerAngles = transform.localEulerAngles;
        RecordDefaultCameraFieldOfView();
        if (UserSettings.ins.bowCameraFixed && !CommonConfig.isReleaseVersion) {
            bowCameraFixed = new BowCameraFixed(this);
        }
    }

    void Start() {
        touchChecker.onMoved += delegate(Touch t, bool isOnUI) {
            if (banLogic) return;
            if (isOnUI) return;
            //触摸控制镜头和拉弓射箭
            this.localEulerAngles.x = Mathf.Clamp(this.localEulerAngles.x - t.deltaPosition.y * Time.deltaTime * 5, -80, 80);
            this.localEulerAngles.y = Mathf.Clamp(this.localEulerAngles.y + t.deltaPosition.x * Time.deltaTime * 5, -90, 90);   
            this.transform.localEulerAngles = this.localEulerAngles; 
        };
        touchChecker.onEnded += delegate(Touch t, bool isOnUI) {
            if (banLogic) return;
            if (!isOnUI) armBow.ADS_fire();
        };
    }

    void Update()
    {   
        //更新相机视野
        if (cameraComp && !banCameraFieldOfView) {
            cameraComp.fieldOfView = cameraFieldOfView;
        }

        if (banLogic) return;

        //满足以下条件则阻止控制输入
        if (GameMgr.ins.gameOver) {
           return;
        }

        if (GameMgr.debugInEditor) {
            //鼠标控制镜头和拉弓射箭
            this.localEulerAngles.x = Mathf.Clamp(this.localEulerAngles.x - 2f * Input.GetAxis("Mouse Y"), -80, 80);
            this.localEulerAngles.y = Mathf.Clamp(this.localEulerAngles.y + 2f * Input.GetAxis("Mouse X"), -90, 90);   
            this.transform.localEulerAngles = this.localEulerAngles; 
            if (EventSystem.current.IsPointerOverGameObject()) return;
        }
        else if (isTouchMode) {
            touchChecker.Update();
        } else {
            if (SB_EventSystem.ins && SB_EventSystem.ins.simulateMouseIsAwaked) return;
            //需要-镜头看向九轴姿态虚拟节点
            needLookAtPoint = true;
        }
    }

    //需要-镜头看向九轴姿态虚拟节点?
    bool needLookAtPoint = false; 
    //镜头旋转转换比值
    float[] _bowRotateConvertRate = null;
    float bowRotateConvertRate {
        get {
            if (_bowRotateConvertRate == null) {
                _bowRotateConvertRate = new float[]{ UserSettings.ins.bowRotateConvert.GetRate() };
            }
            return _bowRotateConvertRate[0];
        }
    }
    void LateUpdate() {
        if (needLookAtPoint) {
            needLookAtPoint = false;
            //镜头看向九轴姿态虚拟节点
            this.transform.LookAt(CameraToLook.ins.point);
            if (!CommonConfig.isReleaseVersion) {
                //镜头旋转比值转换
                Vector3 localEulerAngles = this.transform.localEulerAngles;
                float angleY = localEulerAngles.y;
                if (angleY < 180) {
                    angleY = Mathf.Clamp(angleY * bowRotateConvertRate, 0, 90);
                } else {
                    angleY = Mathf.Clamp((angleY - 360) * bowRotateConvertRate, -90, 0);
                }
                localEulerAngles.y = angleY;
                this.transform.localEulerAngles = localEulerAngles;
            }
        }
        onAfterLateUpdate?.Invoke();
    }
    Action onAfterLateUpdate;

    //---------------相机视野的相关操作---------------------

    //视野值记录
    float cameraFieldOfView = 60;
    [NonSerialized] public float defaultCameraFieldOfView = 60;
    private void RecordDefaultCameraFieldOfView() {
        defaultCameraFieldOfView = cameraComp.fieldOfView;
        cameraFieldOfView = defaultCameraFieldOfView;
    }
    //禁止相机视野改变
    [NonSerialized] public bool banCameraFieldOfView = false;
    
    public void SetCameraFieldOfView(float value) {
        cameraComp.fieldOfView = value;
    }

    public void SetCameraFieldOfViewRecord(float value) {
        cameraFieldOfView = value;
    }

    //拉弓时的相机视野值变化
    public void updateFollowPullBow() {
        // if (cameraFieldOfView > 40) {
        //     cameraFieldOfView -= 20 * Time.deltaTime;
        // } else {
        //     cameraFieldOfView = 40;
        // }
    }

    //松开拉弓时的相机视野值变化
    public void updateGiveUpPullBow() {
        // if (cameraFieldOfView < 60) {
        //     cameraFieldOfView += 20 * Time.deltaTime;
        // } else {
        //     cameraFieldOfView = 60;
        // }
    }

    // 2022-04-28
    // ------ 添加固定镜头选项后，新增的API ------
    bool isArrowFollowing = false;
    public void SetArrowFollowing(bool value) {
        isArrowFollowing = value;
        cameraComp.enabled = !isArrowFollowing;
        AutoSwitchCamera();
    }
    bool isScaleAimDisplaying = false;
    public void SetScaleAimDisplaying(bool value) {
        isScaleAimDisplaying = value;
        AutoSwitchCamera();
    }

    void AutoSwitchCamera() {
        if (bowCameraFixed == null) {
            cameraComp.enabled = !isArrowFollowing;
        } else {
            bowCameraFixed.gameObject.SetActive(!isScaleAimDisplaying && !isArrowFollowing);
            cameraComp.enabled = isScaleAimDisplaying && !isArrowFollowing;
        }
    }

    public Camera GetRenderCamera() {
        if (bowCameraFixed == null) {
            return cameraComp;
        } else {
            if (bowCameraFixed.gameObject.activeSelf) {
                return bowCameraFixed.camera;
            } else {
                return cameraComp;
            }
        }
    }

    BowCameraFixed bowCameraFixed = null;
    public class BowCameraFixed {
        public GameObject gameObject;
        public Transform transform;
        public Camera camera;
        private UnityStandardAssets.ImageEffects.Blur blur;
        //bowCameraComponent
        BowCamera bowCamera;
        private Camera targetCamera;
        private UnityStandardAssets.ImageEffects.Blur targetBlur;

        public BowCameraFixed(BowCamera bowCamera) {
            this.bowCamera = bowCamera;
            gameObject = new GameObject("BowCameraFixed");
            transform = gameObject.transform;
            //复制Camera组件
            targetCamera = bowCamera.cameraComp;
            camera = gameObject.AddComponent<Camera>();
            camera.tag = "MainCamera";
            camera.clearFlags = targetCamera.clearFlags;
            camera.backgroundColor = targetCamera.backgroundColor;
            camera.cullingMask = targetCamera.cullingMask;
            camera.fieldOfView = targetCamera.fieldOfView;
            camera.nearClipPlane = targetCamera.nearClipPlane;
            camera.depth = targetCamera.depth + 0.1f;
            camera.renderingPath = targetCamera.renderingPath;
            //复制Blur组件
            targetBlur = bowCamera.GetComponent<UnityStandardAssets.ImageEffects.Blur>();
            if (targetBlur) {
                blur = gameObject.AddComponent<UnityStandardAssets.ImageEffects.Blur>();
                blur.enabled = targetBlur.enabled;
                blur.blurShader = targetBlur.blurShader;
                blur.blurSpread = targetBlur.blurSpread;
                blur.iterations = targetBlur.iterations;
            }
            //设置Transform属性
            transform.parent = bowCamera.transform.parent;
            transform.localPosition = bowCamera.transform.localPosition;
            transform.localScale = bowCamera.transform.localScale;
            transform.localRotation = Quaternion.identity;
            //监听和驱动LateUpdate
            bowCamera.onAfterLateUpdate += LateUpdate;
            //切换镜头
            bowCamera.AutoSwitchCamera();
        } 

        void LateUpdate() {
            if (gameObject.activeSelf) {
                CrossHair.ins.UpdatePostionWhenFixedCamera();
            }
            if (blur) {
                blur.enabled = targetBlur.enabled;
                if (blur.enabled) {
                    blur.blurShader = targetBlur.blurShader;
                    blur.blurSpread = targetBlur.blurSpread;
                    blur.iterations = targetBlur.iterations;
                }
            }
        }
    }
}