using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class Rabbit : TargetAnimal
{
    //动画播放器
    AnimationPlayer ap;
    //寻路代理
    NavMeshAgent agent;
    //血量
    [System.NonSerialized] public int hp = 1;
    //猎人的变换组件
    Transform hunterT {
        get {
            return ArmBow.ins.transform;
        }
    }
    GrassAreaRecorder grassAreaRecorder {
        get {
            return GrassAreaRecorder.ins;
        }
    }
    [SerializeField] Material[] materials;

    public void ChangeColorByType(int type) {
        GetComponentInChildren<SkinnedMeshRenderer>().material = materials[type - 1];
    }

    void Awake()
    {
        ap = GetComponent<AnimationPlayer>();
        agent = GetComponent<NavMeshAgent>();
        ap.completeCallback = onAniComplete;
    }

    void Start()
    {
        //不同个体动画播放速度差异化
        ap.speed = Random.value * 0.2f + 0.8f;
        //初始动画
        playAniForIdle();
        //初始化自动策略
        InitAutoStrategy();
    }

    void Update()
    {
        //寻路过程监测
        if (HasCloseToDestination()) {
            OnReachDestination();
        } else {
            OnMovingToDestination();
        }
        UpdateAction();
        UpdateActionTime();
        UpdateAutoStrategy();
        //输入监听
        if (Input.GetKeyDown(KeyCode.D)) {
            RandomMove();
        }
    }

    public void Disappear() {
        Destroy(this.gameObject);
    }

    public override void OnHit(Arrow arrow, Vector3 hitPoint, string partName)
    {
        arrow.Head().position = hitPoint + arrow.transform.forward * 0.1f;
        arrow.Hit();
        if (partName == "Leg") hp -= 1;
        else if (partName == "Body") hp -= 2;
        else if (partName == "Head") hp -= 3;
        if (hp <= 0) {
            Die();
        } else {
            Hurt();
        }
    }

    void Die() {
        if (dead) return;
        dead = true;
        this.agent.enabled = false;
        PuaseAutoStrategy();
        onDie?.Invoke(this);
        AudioMgr.ins.PlayAnimalEffect("RabbitDie", AudioMgr.GetAudioSource(this.gameObject));
    }

    void Hurt() {
        RunAwayFromHunter();
        PuaseAutoStrategy();
        addHurtFlag();
        AudioMgr.ins.PlayAnimalEffect("RabbitHurt", AudioMgr.GetAudioSource(this.gameObject));
    }
    Queue<int> hurtFlagList = new Queue<int>();
    void addHurtFlag() {
        hurtFlagList.Enqueue(0);
        Invoke("clearOneHurtFlag", 5);
    }
    void clearOneHurtFlag() {
        if (hurtFlagList.Count > 0) {
            hurtFlagList.Dequeue();
            if (hurtFlagList.Count == 0) {
                OnHurtFlagTimeOut();
            }
        }
    }
    void OnHurtFlagTimeOut() {
        if (!dead) {
            ResumeAutoStrategy();
        }
    }

    //是否已经死亡
    bool dead = false;
    //是否处于移动状态
    bool _moving = false;
    bool moving {
        get {
            return _moving;
        }
        set {
            if (_moving && !value) {
                movingTime = 0;

            }
            if (!_moving && value) stayingTime = 0;
            _moving = value;
        }
    }
    //实时记录“单次移动的持续时间”
    float movingTime = 0;
    //实时停留时间
    float stayingTime = 0;
    //启动寻路
    void SetDestination(Vector3 pos) {
        moving = true;
        this.agent.destination = pos;
    }
    //寻路过程
    void OnMovingToDestination() {
        if (!moving) return;
    }
    //寻路结束
    void OnReachDestination() {
        if (!moving) return;
        moving = false;
    }
    //是否已经接近目的地（寻路完成判断）
    bool HasCloseToDestination() {
        if (!moving) return true;
        if (movingTime > 0.1) {
            if (this.agent.velocity.magnitude < 0.05f) {
                return true;
            }
        }
        return false;
    }
    //更新动作
    void UpdateAction() {
        if (dead) {
            if (!isAniDie()) playAniDie();
        } else if (moving) {
            if (!isAniJump()) playAniJump();
        } else {
            if (!IsAniForIdle()) {
                playAniForIdle();
            }
        }
    }
    //记录动作时间
    void UpdateActionTime() {
        if (moving) {
            movingTime += Time.deltaTime;
        } else {
            stayingTime += Time.deltaTime;
        }
    }

    float willStayTime;
    float willMoveTime;  
    bool autoMoving = false;
    float autoMovingTime;
    bool autoStrategy = true;
    //自动策略的更新逻辑
    void UpdateAutoStrategy() {
        if (!autoStrategy) return;
        if (stayingTime > willStayTime) {
            autoMoving = true;
            RandomMove();
            RandomWillStayTime();
        } 
        if (autoMoving) {
            if (moving) {
                autoMovingTime += Time.deltaTime;
            } else if (autoMovingTime < willMoveTime) {
                RandomMove();
            } else if (autoMovingTime >= willMoveTime) {
                Stay();
                RandomWillMoveTime();
                autoMoving = false;
                autoMovingTime = 0;
            }
        }
    }
    void InitAutoStrategy() {
        autoStrategy = true;
        this.willStayTime = 1 + Random.value * 4;
        RandomWillMoveTime();
    }
    void PuaseAutoStrategy() {
        this.autoStrategy = false;
    }
    void ResumeAutoStrategy() {
        this.autoStrategy = true;
        RandomWillStayTime();
        RandomWillMoveTime();
        this.autoMoving = false;
        this.autoMovingTime = 0;
    }
    void RandomWillStayTime() {
        this.willStayTime = Random.value * 3 + 5;
    }
    void RandomWillMoveTime() {
        this.willMoveTime = Random.value * 2 + 3;
    }
    

    //逃跑远离猎人
    void RunAwayFromHunter() 
    {
        Vector3 backVec = GetPointerHunterToMe();
        SetDestination(transform.position + backVec.normalized * 5);
    }

    //获取猎人到我的位移向量
    Vector3 GetPointerHunterToMe() {
        Vector3 hunterPos = hunterT.position;
        Vector3 myPos = transform.position;
        hunterPos.y = myPos.y;
        return myPos - hunterPos;
    }

    //随机移动
    void RandomMove() {
        if (Random.value < 0.5) {
            SetDestination(grassAreaRecorder.randomOneValidAreaPoint());
        } else {
            Vector3 newDir = Quaternion.AngleAxis(Random.value * 180, Vector3.up) * this.transform.parent.forward;
            Vector3 newPos = this.transform.parent.position + newDir.normalized * 10 * Random.value;
            SetDestination(newPos);
        }
    }

    //停留
    void Stay() {
        if (moving) {
            this.agent.destination = this.agent.nextPosition;
            OnReachDestination();
        }
    }

    //当前动画索引
    int curAnimIndex = 0;
    void playAniEat() {
        ap.play(curAnimIndex = 2, WrapMode.Loop);
    }
    bool isAniEat() {
        return curAnimIndex == 2;
    }
    void playAniDie() {
        ap.play(curAnimIndex = 4, WrapMode.Once);
    }
    bool isAniDie() {
        return curAnimIndex == 4;
    }
    void playAniJump() {
        ap.play(curAnimIndex = 3, WrapMode.Loop);
    }
    bool isAniJump() {
        return curAnimIndex == 3;
    }

    void onAniComplete(AnimationPlayerCompleteResult res) {
        if (res.index == 4) {
            Invoke("Disappear", 2);
        }
    }

    bool IsAniForIdle() {
        return curAnimIndex == 0 || curAnimIndex == 2;
    }

    void playAniForIdle() {
        if (grassAreaRecorder.isInValidArea(this.transform.position)) {
            curAnimIndex = 0;
        } else {
            curAnimIndex = 2;
        }
        ap.play(curAnimIndex, WrapMode.Loop);
    }

    //委托
    public System.Action<Rabbit> onDie;
}