using System.Collections.Generic;
using Continentis.MainGame;
using Continentis.MainGame.Card;
using Continentis.MainGame.Character;
using SLSUtilities.General;

namespace Continentis.Mods.Basic.Buffs
{
    /// <summary>
    /// 魔力外溢/奥术充能（法师）：必须先持有此 Buff，之后每次打出带 Magic 关键词的卡牌自动叠 1 层。
    /// 层数可被特定卡牌消耗以触发爆发效果；本 Buff 不自动消耗。
    /// </summary>
    public class ArcaneCharge : CharacterCombatBuffBase
    {
        public ArcaneCharge()
        {
            Initialize(BuffType.Positive, BuffDispelLevel.Strong);

            this.contentSubmodule = new ContentSubmodule(this)
                .AddParameterGetter("Stack", () => unitedStackSubmodule.stackAmount.ToString());

            this.iconSubmodule = new IconSubmodule(this).SetTextFunctions("Stack");

            // 初始 0 层；层数完全由事件驱动累积
            this.unitedStackSubmodule = new UnitedStackSubmodule(this, 0);

            this.eventSubmodule = new EventSubmodule(this);

            // 打出 Magic 关键词卡牌后叠 1 层
            this.eventSubmodule.onAfterPlayCard.Add("ArcaneCharge_Stack",
                new PrioritizedAction<CardInstance, List<CharacterBase>>(OnAfterPlayCard));
        }

        private void OnAfterPlayCard(CardInstance playedCard, List<CharacterBase> targets)
        {
            if (!playedCard.HasKeyword("Magic")) return;
            unitedStackSubmodule.AddStack(1);
            iconSubmodule.Update();
        }

        /// <summary>
        /// 消耗指定数量的层数。供卡牌逻辑调用。
        /// 返回实际消耗的层数（受当前层数上限约束）。
        /// </summary>
        public int ConsumeStacks(int amount)
        {
            int actual = System.Math.Min(amount, unitedStackSubmodule.stackAmount);
            unitedStackSubmodule.ReduceStack(actual);
            iconSubmodule.Update();
            return actual;
        }

        /// <summary>消耗全部层数并返回消耗量。</summary>
        public int ConsumeAllStacks()
        {
            int amount = unitedStackSubmodule.stackAmount;
            unitedStackSubmodule.ModifyStack(-amount);
            iconSubmodule.Update();
            return amount;
        }

        public override bool OnBuffApply(out CharacterCombatBuffBase existingBuff)
        {
            MainGameManager.Instance.basePrefabs.GenerateInfoText(
                contentSubmodule.displayName, attachedCharacter.characterView);

            // 若已存在则保留现有实例（不重置层数，不二次叠加）
            if (FindExistingSameBuff(out existingBuff))
            {
                return false;
            }

            existingBuff = null;
            return true;
        }
    }
}