using UnityEngine;
using Platformer.Core;

namespace EerieVillage.Skills
{
    /// <summary>
    /// 액티브 스킬 런타임 구현체. ActiveSkillData.Category 기준 단일 클래스.
    /// BT12-Dev v1 §4-2 정합.
    /// - OnTime: Tick()에서 쿨다운 감산 → Fire()
    /// - OnHit·OnKill: PlayerSkillInventory 이벤트 핸들러에서 Fire() 직접 호출
    /// - F(SpecialJudge): Fire() 내 확률 판정 선행
    /// Phase 2-B에서 SkillFireEvent.Execute에 카테고리별 실 발동기 연결 예정.
    /// </summary>
    public class ActiveSkillRuntime : IActiveSkill
    {
        // --- ISkillRuntime ---
        public SkillDataAsset Data => ActiveData;
        public int StackLevel { get; private set; } = 1;

        // --- IActiveSkill ---
        public float BaseCooldown => ActiveData.BaseCooldown;

        /// <summary>
        /// 실제 쿨다운 = BaseCooldown * CooldownMultiplier(P06) / StackLevelFactor.
        /// 하드캡 0.5s (balance/01 v0.2 §9).
        /// </summary>
        public float EffectiveCooldown =>
            Mathf.Max(
                BaseCooldown * _inventory.Stats.CooldownMultiplier / StackLevelFactor(StackLevel),
                0.5f
            );

        public float CooldownRemaining { get; private set; } = 0f;
        public ActiveTrigger Trigger => ActiveData.Trigger;

        // --- 내부 ---
        public ActiveSkillData ActiveData { get; private set; }
        private PlayerSkillInventory _inventory;

        public ActiveSkillRuntime(ActiveSkillData data)
        {
            ActiveData = data;
        }

        public void OnEquip(PlayerSkillInventory inventory)
        {
            _inventory = inventory;
            CooldownRemaining = ActiveData.BaseCooldown;  // 첫 발동은 주기 후
        }

        public void OnUnequip()
        {
            // OnHit·OnKill 이벤트 구독 해제 — Phase 2-D 인벤토리 통합 시 구현
        }

        public void Upgrade()
        {
            if (StackLevel < ActiveData.maxLevel && StackLevel < 5)
                StackLevel++;
            // Lv.5 도달 시 각성 조건 1 충족 — Phase 2-D AwakeningManager 연결 예정
        }

        /// <summary>
        /// PlayerSkillInventory.Update가 매 프레임 호출.
        /// OnTime 트리거만 처리 (OnHit·OnKill은 인벤토리 이벤트 핸들러에서 Fire() 직접 호출).
        /// </summary>
        public void Tick(float deltaTime)
        {
            if (Trigger != ActiveTrigger.OnTime) return;

            CooldownRemaining -= deltaTime;
            if (CooldownRemaining <= 0f)
            {
                Fire();
                // 누적 오버플로 방지 (BT7-Dev PlayerAttackTicker와 동일 패턴)
                CooldownRemaining += EffectiveCooldown;
                CooldownRemaining = Mathf.Max(CooldownRemaining, 0f);
            }
        }

        /// <summary>
        /// 스킬 효과 Dispatch. SkillFireEvent를 Simulation에 Schedule.
        /// F(SpecialJudge) 카테고리는 확률 판정 선행.
        /// Phase 2-B에서 SkillFireEvent.Execute에 실 발동기 연결.
        /// </summary>
        public void Fire()
        {
            // F 카테고리 확률 판정
            if (ActiveData.Category == ActiveCategory.SpecialJudge)
            {
                if (Random.value > ActiveData.FireProbability) return;
            }

            var ev = Simulation.Schedule<SkillFireEvent>();
            ev.Runtime = this;
            ev.Inventory = _inventory;
        }

        /// <summary>
        /// StackLevel에 따른 대미지 팩터 (balance/01 v0.2 §3).
        /// Lv.1=1.0 · Lv.2=1.2 · Lv.3=1.4 · Lv.4=1.6 · Lv.5=2.0
        /// </summary>
        public static float StackLevelFactor(int lv)
        {
            return lv switch
            {
                1 => 1.0f,
                2 => 1.2f,
                3 => 1.4f,
                4 => 1.6f,
                5 => 2.0f,
                _ => 1.0f
            };
        }

        /// <summary>
        /// 유효 대미지 산출 (balance/01 v0.2 §3 대미지 공식).
        /// effectiveDamage = BaseDamage * DamageMultiplier * StackLevelFactor * AttributeMultiplier
        /// </summary>
        public int CalculateEffectiveDamage()
        {
            if (_inventory == null) return ActiveData.BaseDamage;

            var stats = _inventory.Stats;
            float attrMult = 1.0f;
            if (ActiveData.AttributeTags != AttributeTag.None &&
                stats.AttributeMultiplier.TryGetValue(ActiveData.AttributeTags, out float v))
            {
                attrMult = v;
            }

            return Mathf.RoundToInt(
                ActiveData.BaseDamage *
                stats.DamageMultiplier *
                StackLevelFactor(StackLevel) *
                attrMult
            );
        }
    }
}