using System.Collections.Generic;
using System.Linq;
using Continentis.MainGame.Card;
using Continentis.MainGame.UI;
using SLSFramework.General;
using UnityEngine;

namespace Continentis.MainGame.Character
{
    public abstract partial class CharacterCombatBuffBase : CharacterBuffBase
    {
        public CardLogicBase sourceCard;
        
        /// <summary>
        /// 行动计数，每次行动开始时计数-1。
        /// </summary>
        public CountSubmodule actionCountSubmodule;
        /// <summary>
        /// 回合计数，每回合开始时计数-1。
        /// </summary>
        public CountSubmodule roundCountSubmodule;
        /// <summary>
        /// 首次行动计数，仅在角色本回合首次行动时计数-1。
        /// </summary>
        public CountSubmodule roundFirstActionCountSubmodule;
        
        public UnitedStackSubmodule unitedStackSubmodule;
        public IndependentStackSubmodule independentStackSubmodule;
        public CoreAttributeSubmodule coreAttributeSubmodule;
        public GeneralAttributeSubmodule generalAttributeSubmodule;
        public StatusSubmodule statusSubmodule;
    }

    public partial class CharacterCombatBuffBase
    {
        public sealed override bool OnBuffApply(out BuffBase<CharacterBase> existingBuff)
        {
            throw new System.NotImplementedException("请使用类型约束更强的OnBuffApply方法");
        }

        public abstract bool OnBuffApply(out CharacterCombatBuffBase existingBuff);
        public override void OnAfterFirstApply()
        {
            statusSubmodule?.AddStatus();
            attachedCharacter.combatBuffSubmodule.buffList.Exclude(this).For(buff => buff.eventSubmodule?.onOtherBuffFirstApplied.Invoke(this));
        }
        
        public override void OnBuffRemove()
        {
            RefreshAttributes();
            statusSubmodule?.RemoveStatus();
            iconSubmodule?.Remove();
        }
    }

    public partial class CharacterCombatBuffBase
    {
        protected bool FindExistingSameBuff<T>(out T existingBuff) where T : CharacterBuffBase
        {
            bool result = FindExistingSameBuffs(out List<T> existingBuffs, attachedCharacter.combatBuffSubmodule.buffList);
            existingBuff = result ? existingBuffs[0] : null;
            return result;
        }
        
        protected bool FindExistingSameBuffs<T>(out List<T> existingBuffs) where T : CharacterBuffBase
        {
            bool result = FindExistingSameBuffs(out existingBuffs, attachedCharacter.combatBuffSubmodule.buffList);
            return result;
        }
        
        public override void Apply(CharacterBase attachedCharacter, CharacterBase sourceCharacter = null)
        {
            this.Apply(attachedCharacter, sourceCharacter, null);
        }

        public void Apply(CharacterBase attachedCharacter, CharacterBase sourceCharacter = null, CardLogicBase sourceCard = null)
        {
            this.attachedCharacter = attachedCharacter;
            this.sourceCharacter = sourceCharacter;
            this.sourceCard = sourceCard;

            if (OnBuffApply(out CharacterCombatBuffBase existingBuff))
            {
                this.attachedCharacter.combatBuffSubmodule.buffList.AddByPriority(this);

                OnAfterFirstApply();

                if (iconSubmodule != null)
                {
                    (attachedCharacter.characterView.hudContainer.enablingHUDs["CharacterBuffCollection"] as HUD_CharacterBuffCollection)
                        ?.AddBuffIcon(this);
                }
            }
            else
            {
                existingBuff.iconSubmodule?.Update();
            }
            
            attachedCharacter.combatBuffSubmodule.buffList.Exclude(this).For(buff => buff.eventSubmodule?.onOtherBuffApplied.Invoke(this));
            RefreshAttributes();
            iconSubmodule?.Update();
            attachedCharacter.deckSubmodule.GetAllCards().ForEach(card => card.RefreshCardAttributes());
        }

        public override void Remove()
        {
            OnBuffRemove();
            
            if (iconSubmodule != null)
            {
                (attachedCharacter.characterView.hudContainer.enablingHUDs["CharacterBuffCollection"] as HUD_CharacterBuffCollection)
                    ?.RemoveBuffIcon(this);
            }
            
            this.attachedCharacter.combatBuffSubmodule.buffList.Remove(this);
            attachedCharacter.deckSubmodule.GetAllCards().ForEach(card => card.RefreshCardAttributes());
            attachedCharacter.combatBuffSubmodule.buffList.Exclude(this).For(buff => buff.eventSubmodule?.onOtherBuffRemoved.Invoke(this));
        }

        public override void UntriggerRemove()
        {
            this.attachedCharacter.combatBuffSubmodule.buffList.Remove(this);
            attachedCharacter.deckSubmodule.GetAllCards().ForEach(card => card.RefreshCardAttributes());
        }
        
        /// <summary>
        /// 检查并处理专注类Buff的添加逻辑。
        /// 如果已有相同Buff存在，则返回true，并通过out参数返回该Buff。
        /// 如果没有相同Buff存在，则返回false，并在必要时移除优先级最低的专注类Buff以腾出空间。
        /// </summary>
        /// <param name="existingBuff"></param>
        /// <returns></returns>
        public bool FocusingCheck(out CharacterCombatBuffBase existingBuff)
        {
            if (buffType != BuffType.Focusing)
            {
                Debug.LogError("FocusingCheck只能用于专注类Buff");
                existingBuff = null;
                return false;
            }
            
            // 移除超出上限的专注类Buff
            List<CharacterCombatBuffBase> focusingBuffs =
                attachedCharacter.combatBuffSubmodule.buffList.Where(buff => buff.buffType == BuffType.Focusing).ToList();
            focusingBuffs.Sort();
            int maximumFocusingBuffAmount = attachedCharacter.GetAttribute("MaximumFocusingBuffAmount", 1);
            for (int i = maximumFocusingBuffAmount; i < focusingBuffs.Count; i++)
            {
                focusingBuffs[i].Remove();
            }

            // 检查是否已有相同Buff存在
            if (FindExistingSameBuff(out existingBuff))
            {
                return true;
            }
            
            // 如果没有相同Buff存在但已达上限，则移除优先级最低的专注类Buff（将由新Buff替代）
            if(focusingBuffs.Count >= maximumFocusingBuffAmount)
            {
                CharacterCombatBuffBase lowestPriorityBuff = focusingBuffs[focusingBuffs.Count - 1];
                lowestPriorityBuff.Remove();
            }
            
            return false;
        }
    }

    public partial class CharacterCombatBuffBase
    {
        private void RefreshAttributes()
        {
            if (coreAttributeSubmodule != null)
            {
                coreAttributeSubmodule.RefreshAllModifiedAttributes();
            }
            else
            {
                generalAttributeSubmodule?.RefreshAllModifiedAttributes();
            }
        }
    }
}