using Continentis.MainGame;
using Continentis.MainGame.Character;
using SLSUtilities.General;
using UnityEngine;

namespace Continentis.Mods.Basic.Buffs
{
    /// <summary>
    /// 流血：受到攻击时，额外受到等同于层数的伤害（响应式，不会递归触发）。
    /// 每次行动开始时层数减半（至少减 1）。
    /// </summary>
    public sealed class Bleed : CharacterCombatBuffBase
    {
        public Bleed(int stack)
        {
            Initialize(BuffType.Negative, BuffDispelLevel.Basic);
            
            this.contentSubmodule = new ContentSubmodule(this)
                .AddParameterGetter("Stack", () => unitedStackSubmodule.stackAmount.ToString());
            
            this.iconSubmodule = new IconSubmodule(this);
            
            this.unitedStackSubmodule = new UnitedStackSubmodule(this, stack);
            
            this.eventSubmodule = new EventSubmodule(this);
            this.eventSubmodule.onActionStart.Add("Bleed", new PrioritizedAction(OnActionStart));
            this.eventSubmodule.onGetAttacked.Add("Bleed", new PrioritizedAction<AttackResult>(OnGetAttacked));
        }
        
        private void OnGetAttacked(AttackResult result)
        {
            // 响应式 / 生命移除 / 反弹伤害不触发流血
            if (result.context.HasAnyTag(AttackTags.Reactive, AttackTags.HpRemoval, AttackTags.Reflected))
                return;

            int stackAmount = unitedStackSubmodule.stackAmount;
            var ctx = new AttackContext().WithTag(AttackTags.Reactive).WithTag(AttackTags.GuaranteedHit);
            attachedCharacter.Attack(attachedCharacter, stackAmount, ctx);
        }
        
        private void OnActionStart()
        {
            int reducedStack = Mathf.Max(1, Mathf.FloorToInt(unitedStackSubmodule.stackAmount * 0.5f));
            unitedStackSubmodule.ReduceStack(reducedStack);
            iconSubmodule.Update();
        }

        public override bool OnBuffApply(out CharacterCombatBuffBase existingBuff)
        {
            MainGameManager.Instance.basePrefabs.GenerateInfoText("Bleed", attachedCharacter.characterView);
            
            if (FindExistingSameBuff(out existingBuff))
            {
                existingBuff.unitedStackSubmodule.AddStack(this.unitedStackSubmodule.stackAmount);
                return false;
            }
            
            return true;
        }
    }
}