using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;

public class Arrow : MonoBehaviour
{
    private Rigidbody newRigidbody;
    public Vector3 shootOutPosition;
    public float flyTime = 0;
    public bool isHit = false;
    public RaycastHit raycastHit;
    public RaycastHit raycastHit1;
    private float mySpeed = 0;
    public bool simulatedParabola = false; //模拟抛物线 
    public ArmBow armBow;
    public static float speed = GameMgr.RealSizeToGameSize(60);

    void Awake()
    {
        GameMgr.ins.gameMode.PauseTimeCounting(this);
    }

    void Start()
    {
        newRigidbody = this.gameObject.AddComponent<Rigidbody>();

        mySpeed = speed;
        if (GameAssistUI.ins) {
            mySpeed *= (1 + GameAssistUI.ins.shootScaleValue);
        } 

        if (raycastHit.transform && raycastHit.transform.gameObject.name == "TargetBody") {
            //把瞄准点画成红圈，渲染在靶子上
            Transform redCircle = TargetBody.ins.transform.Find("RedCircle");
            redCircle.gameObject.SetActive(true);
            redCircle.transform.position = -redCircle.transform.forward * 0.001f + raycastHit.point;
        }
        //目标落点在靶子时，调整仰角，走Update模式
        if (raycastHit1.transform && raycastHit1.transform.gameObject.name == "TargetBody") {
            ApplyParabolaAngle(raycastHit1.point);   
            //有几率进入抛物线观看镜头         
            float distance = TargetBody.ins.GetDistance();
            if (Mathf.RoundToInt(distance) >= 50) {
                if (Random.value < 0.5) simulatedParabola = true;
            }
        } else {
            //目标落点不在靶子，瞄准点在靶子时，调整仰角，走物理模式
            if (raycastHit.transform && raycastHit.transform.gameObject.name == "TargetBody") {
                ApplyParabolaAngle(raycastHit.point);      
                if (hasParabolaAngle) {
                    hasParabolaAngle = false;
                    float angleX = parabolaAngleInRadius / Mathf.PI * 180;
                    Vector3 eulerAngle = this.transform.eulerAngles;
                    eulerAngle.x = -angleX;
                    this.transform.eulerAngles = eulerAngle;
                }      
            }
        }

        newRigidbody.velocity = this.transform.forward * mySpeed;
        newRigidbody.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;

        Transform cameraTF = this.transform.Find("Camera");
        cameraTF.gameObject.SetActive(true);
        cameraTF.gameObject.AddComponent<ArrowCamera>().arrow = this;

        this.activeEffectTrail(true);

        //如果有自动调整发射角，则禁用物理运动
        if (hasParabolaAngle) {
            this.GetComponent<BoxCollider>().enabled = false;
            Destroy(newRigidbody);
        }
    }


    bool hasParabolaAngle = false;
    float parabolaAngleInRadius = 0;
    void ApplyParabolaAngle(Vector3 destination)
    {
        float deltaX = Vector2.Distance(
            new Vector2(destination.x, destination.z), 
            new Vector2(this.transform.position.x, this.transform.position.z)
        );
        float deltaY = destination.y - this.transform.position.y;
        float a = 0.5f * Physics.gravity.y * Mathf.Pow(deltaX, 2) / Mathf.Pow(this.mySpeed, 2);
        float b = deltaX;
        float c = a - deltaY;
        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);
            parabolaAngleInRadius = Mathf.Min(Mathf.Atan(res1), Mathf.Atan(res2));
        }   
    }

    void OnDestroy() {
        GameMgr.ins.gameMode.ResumeTimeCounting(this);
        if (this.newRigidbody) 
        {
            Destroy(this.newRigidbody);
        }
    }

    Vector3 position;
    Quaternion rotation;

    void FixedUpdate()
    {
        if (newRigidbody) {
            transform.forward = newRigidbody.velocity.normalized;
        }
        if (!isHit && flyTime >= 0) {
            flyTime += Time.deltaTime;
            this.position = this.transform.position;
            this.rotation = this.transform.rotation;
            if (flyTime > 14) {
                Destroy(gameObject);
                GameMgr.ins.gameMode.HitTarget(0);
                AudioMgr.ins.PlayCheer(false);
                nextShoot();
            }
            this.UpdateRotate();
        }
        // this.UpdateShake();
    }

    void Update() {
        UpdateFlyWithoutPhysics();
    }

    float flyTimeWithoutPhysics = 0;
    void UpdateFlyWithoutPhysics() {
        if (!hasParabolaAngle || isHit) return;
        flyTimeWithoutPhysics += Time.deltaTime;
        Vector3 destination = raycastHit1.point;
        float deltaX = Mathf.Sqrt(
            Mathf.Pow(destination.x - shootOutPosition.x, 2) +
            Mathf.Pow(destination.z - shootOutPosition.z, 2)
        );
        float vx = Mathf.Cos(parabolaAngleInRadius) * mySpeed;
        float t = deltaX / vx;
        if (flyTimeWithoutPhysics < t) {
            t = flyTimeWithoutPhysics;
        }
        float vy = Mathf.Sin(parabolaAngleInRadius) * mySpeed + Physics.gravity.y * t;
        float dy = Mathf.Sin(parabolaAngleInRadius) * mySpeed * t + 0.5f * Physics.gravity.y * Mathf.Pow(t, 2);
        float dx = vx * t;
        Vector3 nextPosition = new Vector3(destination.x - shootOutPosition.x, 0, destination.z - shootOutPosition.z);
        nextPosition = nextPosition.normalized * dx;
        nextPosition.y = shootOutPosition.y + dy;
        this.transform.position = nextPosition;
        Vector3 eulerAngles = this.transform.eulerAngles;
        float angleX = Mathf.Atan(vy / vx) / Mathf.PI * 180;
        eulerAngles.x = -angleX;
        this.transform.eulerAngles = eulerAngles;
        //箭头到达目标点时，触发碰撞（之所以用以下，是因为箭的锚点在尾部，而箭的长度接近1.1）
        if (Vector3.Distance(nextPosition, destination) < 1.1f) {
            TargetBody.ins.Hit(this, destination);
        }
    }

    public void Hit() {
        gameObject.GetComponent<BoxCollider>().enabled = false;
        if (newRigidbody) {
            newRigidbody.useGravity = false;
            newRigidbody.velocity = Vector3.zero;
            Destroy(newRigidbody);
            newRigidbody = null;
        }
        isHit = true;
        // this.Shake();
        this.activeEffectCyclone(false);
        this.activeEffectBomb(true);
        this.activeEffectTrail(false);

        //最新一箭击中后会发光标记
        ArrowLightSick.RecoveryAll();
        this.GetComponentInChildren<ArrowLightSick>().Hit();
    }

    public Vector3 getHeadPosition() {
        return this.transform.Find("Head").position;
    }

    /**箭矢旋转 */
    private Vector3 rotateV3 = new Vector3(0, 0, 1400);
    private void UpdateRotate() {
        this.transform.Find("Head").Rotate(rotateV3 * Time.deltaTime, Space.Self);
    }

    /**箭矢震动 */
    private bool shaking = false;
    private float shakeTime = 0;
    private float shakeTimeMax = 0.5f;
    private float shakeRange = 5;
    private int shakeDirection = 1;
    private Vector3 shakeAngles = new Vector3();

    private void Shake() 
    {
        this.shaking = true;
        this.shakeTime = 0;
        this.shakeDirection = 1;
    }

    private void UpdateShake() 
    {
        if (!this.shaking) { 
            return;
        }
        Transform transform = this.transform.Find("Head").transform;
        float shakeRangeNow = (1 - this.shakeTime / this.shakeTimeMax) * this.shakeRange;
        if (shakeRangeNow <= 0) {//震动结束
            this.shaking = false;
            this.shakeAngles.x = 0;
        } else {
            this.shakeAngles.x = -this.shakeDirection * shakeRangeNow;
            this.shakeDirection *= -1;
        }
        transform.localEulerAngles = this.shakeAngles;
        this.shakeTime += Time.deltaTime;
    }

    //进入下一轮射击
    bool hasDoneNextShoot = false;
    public void nextShoot() {
        if (hasDoneNextShoot) return;
        hasDoneNextShoot = true;
        GameMgr.ins.gameMode.ResumeTimeCounting(this);
        if (!GameMgr.ins.gameMode.DoNextShoot()) return;
        this.armBow.readyShoot();

        //把瞄准点画成红圈，渲染在靶子上（取消）
        Transform redCircle = TargetBody.ins.transform.Find("RedCircle");
        redCircle.gameObject.SetActive(false);
        //最新一箭击中后会发光标记（取消）
        ArrowLightSick.RecoveryAll();
    }

    void OnCollisionEnter(Collision collision) {
        if ((1 << collision.gameObject.layer) != LayerMask.GetMask("Target")) 
        {
            this.Hit();
            GameMgr.ins.gameMode.HitTarget(0);
            AudioMgr.ins.PlayCheer(false);
        }
        this.transform.SetParent(collision.transform.parent);
    }

    public void activeEffectCyclone(bool value)
    {
        this.transform.Find("Head/EF_kuosanquan").gameObject.SetActive(value);
        if (!value) return;
        ParticleSystemRenderer ps = this.transform.Find("Head/EF_kuosanquan/kuosan").GetComponent<ParticleSystemRenderer>();
        ParticleSystemRenderer ps1 = this.transform.Find("Head/EF_kuosanquan/kuosan (1)").GetComponent<ParticleSystemRenderer>();
        DOTween.To(() => ps.minParticleSize, value => {
            ps.minParticleSize = value;
            ps.maxParticleSize = value;
        }, 0.4f, 0.6f);
        DOTween.To(() => ps1.minParticleSize, value => {
            ps1.minParticleSize = value;
            ps1.maxParticleSize = value;
        }, 0.8f, 0.6f);
    }

    void activeEffectBomb(bool value) 
    {
        this.transform.Find("Head/EF_baodian").gameObject.SetActive(value);
    }

    void activeEffectTrail(bool value)
    {
        this.transform.Find("EF_tuowei").gameObject.SetActive(value);
        this.transform.Find("EF_tuowei/Trail").GetComponent<TrailRenderer>().time = 1.6f / mySpeed;
    }
}