using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;


/// <summary>
/// 敌人的基类，包含一些基本的功能和事件的虚函数
/// </summary>
public class Enemy : MonoBehaviour
{
    //   _____       _     _ _      
    //  |  __ \     | |   | (_)     
    //  | |__) |   _| |__ | |_  ___ 
    //  |  ___/ | | | '_ \| | |/ __|
    //  | |   | |_| | |_) | | | (__ 
    //  |_|    \__,_|_.__/|_|_|\___|

    /// <summary>
    /// 生命值上限
    /// </summary>
    [FoldoutGroup("属性")][Header("生命值上限")]
    public float HP;

    /// <summary>
    /// 攻击力
    /// </summary>
    [FoldoutGroup("属性")][Header("攻击力")]
    public float ATK;

    /// <summary>
    /// 速度
    /// </summary>
    [FoldoutGroup("属性")][Header("移动速度")]
    public float speed;
    /// <summary>
    /// 打死后掉多少金币
    /// </summary>
    [FoldoutGroup("属性")][Header("掉落金币数")]
    public int coin;

    /// <summary>
    /// 怪物拥有的几种状态
    /// </summary>
    public enum State{wander,seek,atk,dead};
    /// <summary>
    /// 此时怪物能否被攻击
    /// </summary>
    [FoldoutGroup("状态")][Header("当前是否能被攻击")][ReadOnly]
    public bool canBeHit = true;

    //   _____      _            _       
    //  |  __ \    (_)          | |      
    //  | |__) | __ ___   ____ _| |_ ___ 
    //  |  ___/ '__| \ \ / / _` | __/ _ \
    //  | |   | |  | |\ V / (_| | ||  __/
    //  |_|   |_|  |_| \_/ \__,_|\__\___|

    /// <summary>
    /// 当前生命值
    /// </summary>
    [ReadOnly][SerializeField][ProgressBar(0,10,0.15f,0.47f,0.74f)][FoldoutGroup("状态")]
    protected float HPLeft;

    /// <summary>
    /// 当前状态
    /// </summary>
    [EnumPaging][SerializeField][ReadOnly][Header("当前状态")][FoldoutGroup("状态")]
    protected State state;

    //   ______               _   
    //  |  ____|             | |  
    //  | |____   _____ _ __ | |_ 
    //  |  __\ \ / / _ \ '_ \| __|
    //  | |___\ V /  __/ | | | |_ 
    //  |______\_/ \___|_| |_|\__|

    /// <summary>
    /// 当怪物死的时候Call这个函数
    /// </summary>
    protected virtual void OnDead(){}

    /// <summary>
    /// 当怪物触碰到玩家的时候Call这个
    /// </summary>
    protected virtual void OnTouchThePlayer(MyPlayer player){}

    /// <summary>
    /// 当怪物被打的时候触发
    /// </summary>
    /// <param name="hitMethod">攻击方式，枚举类型，具体看MyPlayer</param>
    /// <param name="hitDir">受击方向，-1左，1右</param>
    public virtual void OnBeHit(MyPlayer.AtkMethod hitMethod,int hitDir){}

    /// <summary>
    /// 当怪物发现玩家的时候Call这个
    /// </summary>
    protected virtual void OnFindThePlayer(Transform target){}
    /// <summary>
    /// 当怪物着地的时候触发一次
    /// </summary>
    protected virtual void OnRetouchedTheGround(){}

    //   _   _                            _ 
    //  | \ | |                          | |
    //  |  \| | ___  _ __ _ __ ___   __ _| |
    //  | . ` |/ _ \| '__| '_ ` _ \ / _` | |
    //  | |\  | (_) | |  | | | | | | (_| | |
    //  |_| \_|\___/|_|  |_| |_| |_|\__,_|_|   
    
    /// <summary>
    /// 看看死了没
    /// </summary>
    protected bool CheckDead(){return !(HPLeft > 0);}


    //    _____      _ _ _     _             
    //   / ____|    | | (_)   (_)            
    //  | |     ___ | | |_ ___ _  ___  _ __  
    //  | |    / _ \| | | / __| |/ _ \| '_ \ 
    //  | |___| (_) | | | \__ \ | (_) | | | |
    //   \_____\___/|_|_|_|___/_|\___/|_| |_|                                  
    protected void OnCollisionEnter2D(Collision2D other)//当有物体碰上
    {
        if(other.collider.gameObject.TryGetComponent<MyPlayer>(out MyPlayer player))
            {OnTouchThePlayer(player);}//如果创到的是玩家，则Call事件
        //如果被镰刀创到，Call一下OnBeHit事件，传入攻击方式和攻击来袭方向
        else if(other.collider.gameObject.TryGetComponent<Sickle>(out Sickle sickle))
            {OnBeHit(MyPlayer.AtkMethod.镰刀, 
             (transform.position.x - 
              sickle.transform.position.x > 0) ? -1 : 1);
              Destroy(sickle.gameObject);}
        else if(other.gameObject.tag == "地面")
            {OnRetouchedTheGround();}
    }
    protected virtual void OnTriggerEnter2D(Collider2D other)
    {
        if(other.gameObject.TryGetComponent<MyPlayer>(out MyPlayer player))
            {OnFindThePlayer(other.transform);}//如果监视范围出现玩家，则Call事件
    }
}