using System.Collections.Generic;

using UnityEngine;

using Colosseum.Abnormalities;

namespace Colosseum.Skills
{
    /// <summary>
    /// 단일 슬롯에서 사용할 스킬과 장착된 젬 조합입니다.
    /// </summary>
    [System.Serializable]
    public class SkillLoadoutEntry
    {
        private const int DefaultGemSlotCount = 2;

        [Tooltip("이 슬롯의 기반 스킬")]
        [SerializeField] private SkillData baseSkill;
        [Tooltip("기반 스킬에 장착된 젬")]
        [SerializeField] private SkillGemData[] socketedGems = new SkillGemData[DefaultGemSlotCount];

        public SkillData BaseSkill => baseSkill;
        public IReadOnlyList<SkillGemData> SocketedGems => socketedGems;

        public static SkillLoadoutEntry CreateTemporary(SkillData skill)
        {
            SkillLoadoutEntry entry = new SkillLoadoutEntry();
            entry.SetBaseSkill(skill);
            entry.EnsureGemSlotCapacity();
            return entry;
        }

        public SkillLoadoutEntry CreateCopy()
        {
            SkillLoadoutEntry copy = new SkillLoadoutEntry();
            copy.baseSkill = baseSkill;
            copy.socketedGems = new SkillGemData[socketedGems != null ? socketedGems.Length : DefaultGemSlotCount];

            if (socketedGems != null)
            {
                for (int i = 0; i < socketedGems.Length; i++)
                {
                    copy.socketedGems[i] = socketedGems[i];
                }
            }

            return copy;
        }

        public void EnsureGemSlotCapacity(int slotCount = -1)
        {
            if (slotCount < 0)
            {
                slotCount = baseSkill != null ? baseSkill.MaxGemSlotCount : DefaultGemSlotCount;
            }

            slotCount = Mathf.Max(0, slotCount);
            if (socketedGems != null && socketedGems.Length == slotCount)
                return;

            SkillGemData[] resized = new SkillGemData[slotCount];
            if (socketedGems != null)
            {
                int copyCount = Mathf.Min(socketedGems.Length, resized.Length);
                for (int i = 0; i < copyCount; i++)
                {
                    resized[i] = socketedGems[i];
                }
            }

            socketedGems = resized;
        }

        public void SetBaseSkill(SkillData skill)
        {
            baseSkill = skill;
            EnsureGemSlotCapacity();
        }

        public void SetGem(int slotIndex, SkillGemData gem)
        {
            EnsureGemSlotCapacity();
            if (slotIndex < 0 || slotIndex >= socketedGems.Length)
                return;

            socketedGems[slotIndex] = gem;
        }

        public SkillGemData GetGem(int slotIndex)
        {
            EnsureGemSlotCapacity();
            if (slotIndex < 0 || slotIndex >= socketedGems.Length)
                return null;

            return socketedGems[slotIndex];
        }

        public float GetResolvedManaCost()
        {
            if (baseSkill == null)
                return 0f;

            float resolved = baseSkill.ManaCost;
            if (socketedGems == null)
                return resolved;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null)
                    continue;

                resolved *= gem.ManaCostMultiplier;
            }

            return resolved;
        }

        public float GetResolvedCooldown()
        {
            if (baseSkill == null)
                return 0f;

            float resolved = baseSkill.Cooldown;
            if (socketedGems == null)
                return resolved;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null)
                    continue;

                resolved *= gem.CooldownMultiplier;
            }

            return resolved;
        }

        public float GetResolvedAnimationSpeed()
        {
            if (baseSkill == null)
                return 0f;

            float resolved = baseSkill.AnimationSpeed;
            if (socketedGems == null)
                return resolved;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null)
                    continue;

                resolved *= gem.CastSpeedMultiplier;
            }

            return Mathf.Max(0.05f, resolved);
        }

        public float GetResolvedDamageMultiplier()
        {
            return GetResolvedScalarMultiplier(gem => gem.DamageMultiplier);
        }

        public float GetResolvedHealMultiplier()
        {
            return GetResolvedScalarMultiplier(gem => gem.HealMultiplier);
        }

        public float GetResolvedShieldMultiplier()
        {
            return GetResolvedScalarMultiplier(gem => gem.ShieldMultiplier);
        }

        public float GetResolvedThreatMultiplier()
        {
            return GetResolvedScalarMultiplier(gem => gem.ThreatMultiplier);
        }

        public int GetResolvedRepeatCount()
        {
            if (baseSkill == null)
                return 0;

            int resolved = 1;
            if (socketedGems == null)
                return resolved;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null)
                    continue;

                resolved += gem.AdditionalRepeatCount;
            }

            return Mathf.Max(1, resolved);
        }

        public void CollectCastStartEffects(List<SkillEffect> destination)
        {
            if (destination == null)
                return;

            if (baseSkill != null && baseSkill.CastStartEffects != null)
            {
                for (int i = 0; i < baseSkill.CastStartEffects.Count; i++)
                {
                    SkillEffect effect = baseSkill.CastStartEffects[i];
                    if (effect != null)
                        destination.Add(effect);
                }
            }

            if (socketedGems == null)
                return;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null || gem.CastStartEffects == null)
                    continue;

                for (int j = 0; j < gem.CastStartEffects.Count; j++)
                {
                    SkillEffect effect = gem.CastStartEffects[j];
                    if (effect != null)
                        destination.Add(effect);
                }
            }
        }

        public void CollectCastStartAbnormalities(List<AbnormalityData> destination)
        {
            if (destination == null || socketedGems == null)
                return;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null || gem.SelfAbnormalities == null)
                    continue;

                for (int j = 0; j < gem.SelfAbnormalities.Count; j++)
                {
                    AbnormalityData abnormality = gem.SelfAbnormalities[j];
                    if (abnormality != null)
                        destination.Add(abnormality);
                }
            }
        }

        public void CollectTriggeredEffects(Dictionary<int, List<SkillEffect>> destination)
        {
            if (destination == null)
                return;

            if (baseSkill != null && baseSkill.Effects != null)
            {
                for (int i = 0; i < baseSkill.Effects.Count; i++)
                {
                    SkillEffect effect = baseSkill.Effects[i];
                    if (effect == null)
                        continue;

                    AddTriggeredEffect(destination, i, effect);
                }
            }

            if (socketedGems == null)
                return;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null || gem.TriggeredEffects == null)
                    continue;

                for (int j = 0; j < gem.TriggeredEffects.Count; j++)
                {
                    SkillGemTriggeredEffectEntry entry = gem.TriggeredEffects[j];
                    if (entry == null || entry.Effects == null)
                        continue;

                    for (int k = 0; k < entry.Effects.Count; k++)
                    {
                        SkillEffect effect = entry.Effects[k];
                        if (effect == null)
                            continue;

                        AddTriggeredEffect(destination, entry.TriggerIndex, effect);
                    }
                }
            }
        }

        public void CollectTriggeredAbnormalities(Dictionary<int, List<AbnormalityData>> destination)
        {
            if (destination == null || socketedGems == null)
                return;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null || gem.OnHitAbnormalities == null)
                    continue;

                for (int j = 0; j < gem.OnHitAbnormalities.Count; j++)
                {
                    SkillGemTriggeredAbnormalityEntry entry = gem.OnHitAbnormalities[j];
                    if (entry == null || entry.Abnormalities == null)
                        continue;

                    for (int k = 0; k < entry.Abnormalities.Count; k++)
                    {
                        AbnormalityData abnormality = entry.Abnormalities[k];
                        if (abnormality == null)
                            continue;

                        AddTriggeredAbnormality(destination, entry.TriggerIndex, abnormality);
                    }
                }
            }
        }

        private static void AddTriggeredEffect(Dictionary<int, List<SkillEffect>> destination, int triggerIndex, SkillEffect effect)
        {
            if (!destination.TryGetValue(triggerIndex, out List<SkillEffect> effectList))
            {
                effectList = new List<SkillEffect>();
                destination.Add(triggerIndex, effectList);
            }

            effectList.Add(effect);
        }

        private static void AddTriggeredAbnormality(Dictionary<int, List<AbnormalityData>> destination, int triggerIndex, AbnormalityData abnormality)
        {
            if (!destination.TryGetValue(triggerIndex, out List<AbnormalityData> abnormalityList))
            {
                abnormalityList = new List<AbnormalityData>();
                destination.Add(triggerIndex, abnormalityList);
            }

            abnormalityList.Add(abnormality);
        }

        private float GetResolvedScalarMultiplier(System.Func<SkillGemData, float> selector)
        {
            if (baseSkill == null)
                return 1f;

            float resolved = 1f;
            if (socketedGems == null)
                return resolved;

            for (int i = 0; i < socketedGems.Length; i++)
            {
                SkillGemData gem = socketedGems[i];
                if (gem == null)
                    continue;

                resolved *= Mathf.Max(0f, selector(gem));
            }

            return resolved;
        }
    }

    /// <summary>
    /// 현재 시전 중인 스킬 로드아웃의 젬 보정값을 안전하게 조회하는 유틸리티입니다.
    /// </summary>
    public static class SkillRuntimeModifierUtility
    {
        public static float GetDamageMultiplier(GameObject caster)
        {
            return GetCurrentLoadout(caster)?.GetResolvedDamageMultiplier() ?? 1f;
        }

        public static float GetHealMultiplier(GameObject caster)
        {
            return GetCurrentLoadout(caster)?.GetResolvedHealMultiplier() ?? 1f;
        }

        public static float GetShieldMultiplier(GameObject caster)
        {
            return GetCurrentLoadout(caster)?.GetResolvedShieldMultiplier() ?? 1f;
        }

        public static float GetThreatMultiplier(GameObject caster)
        {
            return GetCurrentLoadout(caster)?.GetResolvedThreatMultiplier() ?? 1f;
        }

        private static SkillLoadoutEntry GetCurrentLoadout(GameObject caster)
        {
            if (caster == null)
                return null;

            SkillController skillController = caster.GetComponent<SkillController>();
            if (skillController == null)
                return null;

            return skillController.CurrentLoadoutEntry;
        }
    }
}