using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
/* 弓对象 */
public class ArmBow : MonoBehaviour
{
    [SerializeField] AnimationPlayer AP_arm;
    [SerializeField] AnimationPlayer AP_bow;
    [SerializeField] GameObject arrow;
    BowCamera _bowCamera;
    BowCamera bowCamera {
        get {
            if (!_bowCamera) _bowCamera = GetComponentInParent<BowCamera>();
            return _bowCamera; 
        }
    }
    //有效射击目标集合，可以理解为射中集合中的目标才能得分
    public HashSet<TargetBody> validTargets = new HashSet<TargetBody>();
    
    //射箭姿态记录索引倒退数，根据射击难度制造误差
    [NonSerialized] public int shootBackTime = 0;
    [NonSerialized] public float shootOffsetAngleScale = 0;

    bool canShoot = false;
    bool pulling = false;
    bool readying = false;

    //禁止准备的外部接口
    [NonSerialized] public bool banReady = false;
    //禁止射击的外部接口
    [NonSerialized] public bool banShoot = false;

    //九轴姿态记录
    // [NonSerialized] public Quaternion[] recordRotations = new Quaternion[100];
    // float[] recordRotationVars = new float[99];
    // [NonSerialized] public int recordCount = 0;

    //过去几帧的镜头值记录
    Quaternion[] cameraRotations = new Quaternion[6];
    int cameraRotationHasRecordCount = 0;

    public static ArmBow ins;

    void Awake()
    {
        ins = this;
        //initdata
        int currentShootLevel = LoginMgr.myUserInfo.shootLevel;
        shootBackTime = new int[]{0, 2, 5}[currentShootLevel];
        shootOffsetAngleScale = new float[]{0, 7.5f, 10f}[currentShootLevel];
    }

    void Start()
    {
        this.readyShoot();
    }

    void FixedUpdate()
    {
        if (this.canShoot)
        {
            if (DebugBowPower.ins) DebugBowPower.ins.DoUpdate();
        }
        // 记录一些旋转角---start
        if (this.bowCamera) {
            for (int i = cameraRotations.Length - 1; i > 0 ; i--) {
                cameraRotations[i] = cameraRotations[i - 1];
            }
            cameraRotations[0] = this.bowCamera.transform.rotation;
            cameraRotationHasRecordCount++;
        }
        // 记录一些旋转角---end
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Q)) 
        {
            this.ADS_fire();
        }
        if (this.pulling) {
            this.bowCamera.updateFollowPullBow();
        } 
        else if (!this.canShoot)
        {
            this.bowCamera.updateGiveUpPullBow();
        }
    }

    void onComplete(AnimationPlayerCompleteResult res) {
        if (res.index == 0) {
            this.readying = true;
            this.idle();
            this.Invoke("idleToADS", 0.1f);
        }
        else if (res.index == 2) {
            this.ADS_idle();
        }
    }

    public void ready() {
        if (banReady) return;
        GameMgr.ins.gameMode.PauseTimeCounting(this);
        GameMgr.ins.gameMode.onBowReady();
        this.arrow.SetActive(true);
        AP_arm.play(0, WrapMode.Once);
        AP_bow.play(0, WrapMode.Once);
        AP_arm.completeCallback = onComplete;
        this.pulling = false;
        this.canShoot = false;
    }

    void idle() {
        AP_arm.play(1, WrapMode.Loop);
        AP_bow.play(1, WrapMode.Loop);
        AP_arm.completeCallback = null;
        this.pulling = false;
        this.canShoot = false;
        if (DebugBowPower.ins) DebugBowPower.ins.Init();
    }

    public void idleToADS() {
        AP_arm.play(2, WrapMode.Once);
        AP_bow.play(2, WrapMode.Once);
        AP_arm.completeCallback = onComplete;
        this.pulling = true;
        this.canShoot = false;
    }

    void ADS_idle() {
        GameMgr.ins.gameMode.ResumeTimeCounting(this);
        this.canShoot = true;
        this.pulling = false;
        if (DebugBowPower.ins) DebugBowPower.ins.PullFinish();
    }

    public void ADS_fire() {
        if (!canShoot || banShoot || GameMgr.ins.gamePause) return;
        GameMgr.ins.gameMode.onBowShoot();
        this.pulling = false;
        this.canShoot = false;
        this.readying = false;
        AP_bow.play(0, WrapMode.Once);
        this.arrow.SetActive(false);
        shoot();
    }

    public void readyShoot() {
        this.bowCamera.SetCameraFieldOfViewRecord(60);
        this.ready();
    }

    void shoot() {
        // 筛选出一个稳定的发射角度
        // #region 
        //     bool useAxisData = false;//表示是否使用了九轴原始数据
        //     Quaternion absolute_rotation = this.bowCamera.transform.rotation;
        //     Quaternion final_rotation = this.bowCamera.transform.rotation;
        //     if (recordCount >= recordRotations.Length) {
        //         for (int i = 0; i < recordRotationVars.Length; i++) {
        //             recordRotationVars[i] = Quaternion.Angle(recordRotations[i], recordRotations[i + 1]);
        //         }
        //         int startCheckIndex = 5;
        //         int checkAfterCount = 5;
        //         float min_wave = float.MaxValue;
        //         for (int i = startCheckIndex; i < recordRotationVars.Length - checkAfterCount; i++)
        //         {
        //             float wave = 0;
        //             for (int j = i; j <= i + checkAfterCount; j++)
        //             {
        //                 wave += recordRotationVars[j];
        //             }
        //             if (wave < min_wave)
        //             {
        //                 min_wave = wave;
        //                 int best_rotation_index = i;
        //                 absolute_rotation = recordRotations[best_rotation_index];
        //                 best_rotation_index -= this.shootBackTime;
        //                 if (best_rotation_index < 0) best_rotation_index = 0;
        //                 final_rotation = recordRotations[best_rotation_index];
        //                 useAxisData = true;
        //             }
        //         }
        //         if (useAxisData) {//坐标轴换算，原始九轴数据直接用可能会出问题，比如相机的父节点Rotation不为identity时
        //             Quaternion baseQuat = GameMgr.ins.transform.rotation;
        //             absolute_rotation = baseQuat * absolute_rotation;
        //             final_rotation = baseQuat * final_rotation;
        //         }
        //     }
        // #endregion
        #region 
            Quaternion absolute_rotation = this.bowCamera.transform.rotation;
            Quaternion final_rotation = this.bowCamera.transform.rotation;
            if (cameraRotationHasRecordCount >= cameraRotations.Length) {
                absolute_rotation = cameraRotations[5];
                final_rotation = cameraRotations[5 - this.shootBackTime];
            }
        #endregion

        Quaternion oldCameraRotation = Camera.main.transform.rotation;
        Camera.main.transform.rotation = absolute_rotation;
        RaycastHit absoluteRay = CrossHair.ins.GetRaycastHit();
        Camera.main.transform.rotation = oldCameraRotation;
        
        Vector3 shootOutPosition = this.bowCamera.transform.position;
        Vector3 arrowEuler = absolute_rotation.eulerAngles;
        arrowEuler.z = 0; //绝对角可能是从原始九轴记录数组里取出来的，它的z可能不是0
        GameObject arrowCopy = GameObject.Instantiate(this.arrow, shootOutPosition, Quaternion.Euler(arrowEuler));

        Vector3 s1 = arrowCopy.transform.localScale;
        Vector3 s2 = bowCamera.transform.localScale;
        arrowCopy.transform.localScale = new Vector3(s1.x * s2.x, s1.y * s2.y, s1.z * s2.z);

        Arrow arrowComp = arrowCopy.AddComponent<Arrow>();
        arrowComp.armBow = this;
        arrowComp.shootOutPosition = shootOutPosition;
        arrowComp.absoluteRay = absoluteRay;
        arrowComp.offsetAngle = GameDebug.ins ? 
            GameDebug.ins.GetOffsetAngle() : 
            FormatAngle(Quaternion.Angle(absolute_rotation, final_rotation));
        arrowComp.finalAngleAfterOffset = final_rotation.eulerAngles;

        if (ShootCheck.ins && !GameMgr.debugInEditor && !BowCamera.isTouchMode) 
        {
            Arrow.speed = GameMgr.RealSizeToGameSize(ShootCheck.ins.shootSpeed);
        }

        arrowCopy.SetActive(true);  
        arrow.SetActive(false);

        GameEventCenter.ins.onBowArrowShootOut?.Invoke(this, arrowComp);

        AudioMgr.ins.PlayShoot(AudioMgr.GetAudioSource(arrowCopy));
        // this.gameObject.SetActive(false);
        if (AimHandler.ins) AimHandler.ins.BanControlObjRotate(true);
    }

    //因为Unity引擎的规则，向上时359~270度，向下是0~90度
    //为了方便数学运算，换算成 向上时0~90度，向下是0~-90度
    float FormatAngle(float value)
    {
        if (value > 180) value = 360 - value;
        else value = -value;
        return value;
    }

    public void OnEnable() 
    {
        AudioMgr.GetAudioSource(this.gameObject).clip = null;
    }

    public void Hide()
    {
        this.transform.localScale = Vector3.zero;
    }

    public void Show()
    {
        this.transform.localScale = new Vector3(1, 1, 1);
    }

    public bool IsCanShoot()
    {
        return canShoot;
    }

    public void mouseDown() 
    {
        if (!this.readying) return;
        if (this.pulling || this.canShoot) return;
        this.idleToADS();
    }

    public void mouseUp() 
    {
        if (!this.readying) return;
        if (this.pulling) {
            this.idle();
        } else if (this.canShoot) {
            this.ADS_fire();
        }
    }
}