using System;
using System.Collections.Generic;
using System.Linq;
using SLSUtilities.General;
using UnityEngine;

namespace Continentis.MainGame
{
    public enum BuffDispelLevel
    {
        Basic = 0, //弱驱散
        Strong = 10, //强驱散
        DeathOnly = 20, //不可驱散（死亡除外）
        Undispellable = 100 //不可驱散（包括死亡）
    }
        
    public enum BuffType
    {
        Positive,
        Negative,
        Neutral,
        Focusing
    }
    
    public abstract partial class BuffBase<T> : IPrioritized
    {
        public string identification;
        public BuffType buffType;
        public BuffDispelLevel dispelThreshold;
        public ContentSubmodule contentSubmodule;
        public int Priority { get; private set; }
        
        protected void Initialize(BuffType buffType, BuffDispelLevel dispelThreshold, int priority = 0)
        {
            this.buffType = buffType;
            this.dispelThreshold = dispelThreshold;
            this.Priority = priority + (buffType == BuffType.Focusing ? 10000 : 0);
        }
        
        protected void SetIdentification(string id)
        {
            this.identification = id;
        }
    }

    public partial class BuffBase<T>
    {
        protected bool FindExistingSameBuffs<T1, T2>(out List<T2> existingBuffs, List<T1> buffList) where T1 : BuffBase<T> where T2 : BuffBase<T>
        {
            existingBuffs = new List<T2>();
            //Debug.Log($"Searching for existing buff of type: {this.GetType()} in buff list of count: {buffList.Count}");
            foreach (T1 buff in buffList)
            {
                //Debug.Log($"existing buff type: {buff.GetType().AssemblyQualifiedName}, this buff type: {this.GetType().AssemblyQualifiedName}");
                if (buff.GetType() == this.GetType())
                {
                    //Debug.Log("Found existing buff of the same type.");
                    existingBuffs.Add(buff as T2);
                    //Debug.Log(existingBuff == null);
                }
                else
                {
                    //Debug.Log("Buff types do not match.");
                }
            }

            return existingBuffs.Count > 0;
        }
        
        public abstract void Apply(T attached);
        
        public abstract void Remove();

        public abstract void UntriggerRemove();
        
        public virtual void Dispel(BuffDispelLevel dispelLevel)
        {
            if (CanBeDispelled(dispelLevel))
            {
                OnBuffDispel();
                Remove();
            }
        }
    }
    
    public partial class BuffBase<T>
    {
        //Buff生命周期函数

        /// <summary>
        /// Buff被尝试添加到宿主时调用。
        /// 返回 true 表示这是一个全新的 Buff，框架将执行添加流程；
        /// 返回 false 表示已有同类 Buff 存在，框架将执行叠加/跳过流程。
        /// 子类必须实现此方法。
        /// </summary>
        public abstract bool OnBuffApply(out BuffBase<T> existingBuff);
        
        /// <summary>
        /// Buff首次成功添加到角色后调用。在OnBuffApply完成，且返回true之后调用。
        /// 如果Buff在被添加时，发现已有同类Buff存在，则不会调用此函数。
        /// </summary>
        public virtual void OnAfterFirstApply()
        {
            
        }
        
        /// <summary>
        /// Buff被驱散（移除）时调用，在OnBuffRemove之前调用。
        /// </summary>
        public virtual void OnBuffDispel()
        {
            
        }
        
        /// <summary>
        /// Buff被正常移除（包括驱散）时调用。在Buff生命周期结束时调用。
        /// UntriggerRemove不会调用此函数。但是UntriggerRemove通常情况下绝不会被调用。
        /// </summary>
        public virtual void OnBuffRemove()
        {
            
        }
    }
    
    public partial class BuffBase<T>
    {
        /// <summary>
        /// 判断该Buff能否被指定驱散等级的驱散效果驱散。
        /// </summary>
        protected bool CanBeDispelled(BuffDispelLevel dispelLevel)
        {
            return dispelLevel >= dispelThreshold;
        }
    }
    
}