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

namespace Continentis.Mods.Basic.Buffs
{
    /// <summary>
    /// 风蚀（Wind 元素）：行动开始时移除目标 [层数×2] 点格挡，然后层数 -1。
    /// 定位：反格挡，与 Firm（格挡积累）形成元素克制。
    /// </summary>
    public sealed class Erosion : CharacterCombatBuffBase
    {
        public Erosion(int stack)
        {
            Initialize(BuffType.Negative, BuffDispelLevel.Basic);

            this.contentSubmodule = new ContentSubmodule(this)
                .AddParameterGetter("Stack",       () => unitedStackSubmodule.stackAmount.ToString())
                .AddParameterGetter("BlockRemoval", () => (unitedStackSubmodule.stackAmount * 2).ToString());

            this.iconSubmodule = new IconSubmodule(this);

            this.unitedStackSubmodule = new UnitedStackSubmodule(this, stack);

            this.eventSubmodule = new EventSubmodule(this);
            this.eventSubmodule.onActionStart.Add("Erosion", new PrioritizedAction(OnActionStart));
        }

        private void OnActionStart()
        {
            int blockRemoval = unitedStackSubmodule.stackAmount * 2;
            // 负值减少格挡，Clamp 至 0
            attachedCharacter.ModifyAndClampAttribute(CharacterAttributes.Block, -blockRemoval);

            unitedStackSubmodule.ReduceStack(1);
            iconSubmodule.Update();
        }

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

            if (FindExistingSameBuff(out existingBuff))
            {
                existingBuff.unitedStackSubmodule.AddStack(this.unitedStackSubmodule.stackAmount);
                return false;
            }

            return true;
        }
    }
}