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

namespace Continentis.Mods.Basic.Buffs
{
    /// <summary>
    /// 复仇（骑士）：必须先持有此 Buff，之后每次被攻击叠加 1 层。
    /// 使用攻击类卡牌时，消耗所有层数对所有目标各造成等量的额外物理伤害。
    /// </summary>
    public class Vengeance : CharacterCombatBuffBase
    {
        public Vengeance()
        {
            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);

            // 被攻击时叠层（过滤响应式和生命移除，防止递归）
            this.eventSubmodule.onGetAttacked.Add("Vengeance_Stack", new PrioritizedAction<AttackResult>(result =>
            {
                if (result.context.HasAnyTag(AttackTags.Reactive, AttackTags.HpRemoval)) return;
                unitedStackSubmodule.AddStack(1);
                iconSubmodule.Update();
            }));

            // 打出攻击类卡牌时消耗所有层数造成额外伤害
            this.eventSubmodule.onAfterPlayCard.Add("Vengeance_Consume",
                new PrioritizedAction<CardInstance, List<CharacterBase>>(OnAfterPlayCard));
        }

        private void OnAfterPlayCard(CardInstance playedCard, List<CharacterBase> targets)
        {
            if (!playedCard.HasKeyword("Attack")) return;
            if (unitedStackSubmodule.stackAmount <= 0) return;

            int bonus = unitedStackSubmodule.stackAmount;
            unitedStackSubmodule.ModifyStack(-bonus);
            iconSubmodule.Update();

            var ctx = new AttackContext()
                .WithTag(AttackTags.Reactive)
                .WithTag(AttackTags.GuaranteedHit)
                .WithDamageKeywords("Physics");

            foreach (CharacterBase target in targets)
            {
                EnqueueReaction(Cmd.Do(() => attachedCharacter.Attack(target, bonus, ctx)));
            }
        }

        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;
        }
    }
}