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

//战士敌军类
//带有武器的战士可以使用
//用于一般敌人，小boss身上
//会攻击，血量低于一定值时会奔跑
//拥有攻击间隔及攻击力属性，攻击玩家后不会消失，玩家躲开后会继续追击玩家
public class GhostWarrior : Hurtable
{
    //数值相关
    //是否碰到玩家
    public bool isTouched;
    //是否死亡
    public bool isDeath;
    //是否暂停
    public bool isPause;
    //怪物的状态(0为行走,1为站立,2为跑步,3为攻击,4为死亡)
    private int status;
    //怪物的各项属性值(攻击力，护甲值，行走速度，奔跑速度)
    public int atk;
    public int def;
    public float runningSpeed;
    public float walkingSpeed;
    //显示或与玩家相关
    private GameObject Player;
    private Player playerScript;
    private float distancePE_;
    //敌人发动攻击时离玩家的距离
    private float standTimer;
    public float attackDistace;
    //玩家所持盾
    private LightShield playerShield_;
    //判断攻击对象是不是玩家(不是玩家就是盾牌)
    private bool isAttackedPlayer;
    //敌人最大生命值
    private float maxHp;
    //死亡特效
    public GameObject deathEffect_;
    //动作
    public Animator warriorAnime_;
    //判断敌人是否愤怒
    private bool isAngry;

    //攻击间隔（以秒计）(攻击过程中进行判定)
    public float nextAttackTimer;
    //攻击过程中的计时器
    public float attackTimer;
    public float attackEndTimer;
    //是否处于攻击状态
    private bool isAttacking_;
    //是否命中玩家
    private bool isHitPlayer;
    //是否被防御(攻击判定圈里有检测到盾牌)
    private bool isDefended;

    // Use this for initialization
    void Start()
    {
        Player = GameObject.FindGameObjectWithTag("Player");
        playerScript = Player.GetComponent<Player>();
        hitEvent.AddListener(GhostAttacked_);
        deathEvent.AddListener(GhostDeath_);
        status = 0;
        standTimer = 0.3f;
        isAttackedPlayer = false;
        myself_1.GetComponent<NavMeshAgent>().speed = walkingSpeed;
        maxHp = hp;
        warriorAnime_.SetBool("walk", true);
        myself_1.GetComponent<BoxCollider>().enabled = false;
        isDefended = false;
    }

    // Update is called once per frame
    void Update()
    {
        distancePE_ = CaculatePlayerDistance();
        if (!isDeath)
        {
            GhostAlive_();
        }
        //生气了之后2倍速奔跑
        if (hp <= maxHp / 2 && !isAngry)
        {
            isAngry = true;
            warriorAnime_.SetBool("walk", false);
            warriorAnime_.SetBool("run", true);
            myself_1.GetComponent<NavMeshAgent>().speed = walkingSpeed * 2;
        }

        //敌人攻击相关判定
        if (isAttacking_ && isTouched) {
            isHitPlayer = true;
            isTouched = false;
        }
        if (isHitPlayer) {
            if (isAttackedPlayer)
            {
                //warriorAnime_.SetBool("attack", true);
                if (isDefended)
                {
                    playerShield_.shieldHit();
                }
                else {
                    playerScript.Hurted(atk);
                }
                isHitPlayer = false;
            }
        }
        
    }

    //敌人行为相关
    private void GhostBirth_()
    {

    }
    //原地不动
    private void GhostStand_()
    {
        myself_1.GetComponent<NavMeshAgent>().destination = myself_1.transform.position;
        warriorAnime_.SetBool("walk", false);
        warriorAnime_.SetBool("run", false);
    }
    //行走
    private void GhostWalk_()
    {
        //myself_1.transform.position += new Vector3(0, 0, Mathf.Sin(distancePE_) * 0.01f);
        myself_1.GetComponent<NavMeshAgent>().destination = Player.transform.position + Player.GetComponent<CapsuleCollider>().center;
    }
    //跑(这里的跑指最后的冲刺)
    private void GhostRun_()
    {
        myself_1.GetComponent<NavMeshAgent>().speed = runningSpeed;
        warriorAnime_.SetBool("run", true);
        GhostWalk_();
    }
    //攻击玩家
    private void GhostAttack_()
    {
        isHitPlayer = false;
        StartCoroutine(AttackAction());
        /*if (isAttackedPlayer)
        {
            //warriorAnime_.SetBool("attack", true);
            playerScript.Hurted(atk);
        }*/
    }
    //受到攻击
    private void GhostAttacked_()
    {
        myself_1.GetComponentInChildren<Renderer>().material.color = new Vector4(1.0f, hp / maxHp, hp / maxHp, 1.0f);
    }
    //死亡
    private void GhostDeath_()
    {
        status = 4;
        isDeath = true;
        Instantiate(deathEffect_);
        deathEffect_.transform.position = myself_1.transform.position;
        int criticalRandom = Random.Range(0, 3);
        if (criticalRandom > 1)
        {
            playerScript.speedUp();
        }
        Destroy(myself_1);
    }

    //判断距离相关(计算敌人与玩家的距离)
    private float CaculatePlayerDistance()
    {
        float posX = myself_1.transform.position.x;
        float posZ = myself_1.transform.position.z;
        Vector3 playerPos = Player.transform.position + Player.GetComponent<CapsuleCollider>().center;
        float playerX = playerPos.x;
        float playerZ = playerPos.z;
        float distancePE = Mathf.Sqrt((playerX - posX) * (playerX - posX) + (playerZ - posZ) * (playerZ - posZ));
        return distancePE;
    }

    //怪物活着的时候该做的事情
    private void GhostAlive_()
    {
        if (status == 0 && distancePE_ > attackDistace)
        {
            GhostWalk_();
        }
        else if (status == 0 && distancePE_ <= attackDistace)
        {
            GhostStand_();
            status = 1;
            GhostAttack_();
        }
    }


    private void OnCollisionEnter(Collision collision)
    {
        if (collision.collider.gameObject.tag == "shield")
        {
            isDefended = true;
            isTouched = true;
            playerShield_ = GameObject.FindGameObjectWithTag("shield").GetComponent<LightShield>();
        }
        else if(collision.collider.gameObject.tag == "Player")
        {
            isAttackedPlayer = true;
            isTouched = true;
        }
    }

    IEnumerator AttackAction() {
        warriorAnime_.SetBool("attack",true);
        yield return new WaitForSeconds(attackTimer) ;
        isDefended = false;
        myself_1.GetComponent<BoxCollider>().enabled = true;
        isAttacking_ = true;
        yield return new WaitForSeconds(attackEndTimer);
        isAttacking_ = false;
        isDefended = false;
        myself_1.GetComponent<BoxCollider>().enabled = false;
        warriorAnime_.SetBool("attack",false);
        yield return new WaitForSeconds(nextAttackTimer);
        status = 0;
    }
}