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

public class WarUnit : MonoBehaviour
{
    public Action<WarUnit> DelDie;
    public Action<int> DelHurt;
    public Action<WarUnit, int> DelSplash;

    public bool IsDead => mCurHp <= 0;

    public Transform AtkTrans;
    public Transform HitTrans;

    public BlockType BType;
    public int Level;
    public int GroupID;

    public GroupType Group;
    public GroupManager AgainstGroup;

    [Header("Base Attributes")]
    public int MaxHP = 5;
    public int Damage = 1;

    public float MoveSpeed = 30;

    public AttackType AtkType = AttackType.Near;
    public float AtkDistance = 0;

    public int AtkArea = 0;
    public float AtkInterval = 1;
    
    protected int mCurHp;
    protected Transform mTrans;

    private void Awake()
    {
        mTrans = transform;

        AwakeInit();
    }

    protected virtual void AwakeInit()
    {

    }

    public virtual void InitAttr(WarUnitAttr pAttr)
    {
        MaxHP = pAttr.MaxHP;
        Damage = pAttr.Damage;

        MoveSpeed = pAttr.MoveSpeed;

        AtkType = pAttr.AtkType;
        AtkDistance = pAttr.AtkDistance;

        AtkArea = pAttr.AtkArea;
        AtkInterval = pAttr.AtkInterval;
        
        mCurHp = MaxHP;
    }

    public virtual Vector3 RelativePos(Vector3 pRefPos = default)
    {
        return mTrans.position;
    }

    public int Hurt(int pDamage, bool pSplash = true)
    {
        if (mCurHp <= 0)
            return 0;

        int tRealDamage = Mathf.Min(pDamage, mCurHp);

        mCurHp -= pDamage;
        int tOverlapDamage = mCurHp >= 0 ? 0 : Mathf.Abs(mCurHp);
        mCurHp = Mathf.Max(0, mCurHp);
        HandleHurt(pDamage);

        DelHurt?.Invoke(tRealDamage);
        if (mCurHp <= 0)
        {
            Die();
        }

        if (tOverlapDamage > 0 && pSplash)
        {
            DelSplash?.Invoke(this, tOverlapDamage);
        }

        return tOverlapDamage;
    }

    protected virtual void HandleHurt(int pDamage)
    {

    }

    public void Die()
    {
        mCurHp = 0;
        HandleDie();

        DelDie?.Invoke(this);
        DelDie = null;
    }

    protected virtual void HandleDie()
    {

    }
}

public enum GroupType
{
    Player,
    Enemy
}

public enum AttackType
{
    Near,
    Far
}

public class WarUnitAttr
{
    public int MaxHP = 5;
    public int Damage = 1;

    public float MoveSpeed = 30;

    public AttackType AtkType = AttackType.Near;
    public float AtkDistance = 0;

    public int AtkArea = 0;
    public float AtkInterval = 1;
}