using BumpCombat.Player;
using BumpCombat.Core;
using System;
using System.Globalization;
using UnityEngine;

namespace BumpCombat.Progression
{
    [CreateAssetMenu(
        fileName = "ModifierDefinition",
        menuName = "BumpCombat/Progression/Modifier Definition")]
    public sealed class ModifierDefinition : ScriptableObject
    {
        [SerializeField] private string modifierId;
        [SerializeField] private string displayName;
        [SerializeField] private CharacterStat stat;
        [SerializeField] private ModifierOperation operation;
        [SerializeField] private float value;
        [SerializeField, Min(1)] private int maximumStacks = 1;
        [SerializeField, Min(0f)] private float healOnApply;

        public string ModifierId => modifierId;
        public string DisplayName => displayName;
        public CharacterStat Stat => stat;
        public ModifierOperation Operation => operation;
        public float Value => value;
        public int MaximumStacks => maximumStacks;
        public float HealOnApply => healOnApply;

        public string GetKoreanDisplayName()
        {
            return $"{GetKoreanStatName(stat)} 강화";
        }

        public string GetKoreanEffectDescription(float effectMultiplier)
        {
            string statName = GetKoreanStatName(stat);
            string effectValue = operation == ModifierOperation.Flat
                ? FormatSignedValue(value * effectMultiplier)
                : $"{FormatSignedValue(value * effectMultiplier * 100f)}%";
            string description = $"{statName} {effectValue}";
            if (healOnApply > 0f)
            {
                description += $"\n즉시 체력 회복 {FormatSignedValue(healOnApply * effectMultiplier)}";
            }

            return description + "\n선택하면 즉시 적용됩니다.";
        }

        private static string GetKoreanStatName(CharacterStat targetStat)
        {
            switch (targetStat)
            {
                case CharacterStat.CollisionDamage: return "몸통박치기 피해";
                case CharacterStat.MoveSpeed: return "이동 속도";
                case CharacterStat.MaxHealth: return "최대 체력";
                case CharacterStat.Armor: return "방어력";
                case CharacterStat.LifeSteal: return "생명력 흡수";
                case CharacterStat.ExperienceGain: return "경험치 획득량";
                case CharacterStat.ExperiencePickupRange: return "경험치 획득 범위";
                case CharacterStat.ArtifactGaugeGain: return "유물 게이지 획득량";
                case CharacterStat.IncomingDamage: return "받는 피해";
                case CharacterStat.AttackDamage: return "공격 피해";
                default: return "능력치";
            }
        }

        private static string FormatSignedValue(float amount)
        {
            if (Mathf.Approximately(amount, 0f))
            {
                return "0";
            }

            string formatted = amount.ToString("0.##", CultureInfo.InvariantCulture);
            return amount > 0f ? $"+{formatted}" : formatted;
        }

        public bool CanApply(PlayerStats playerStats)
        {
            return CanApplyToModel(playerStats);
        }

        public bool CanApplyToModel(CharacterModel model)
        {
            return model != null
                && model.GetStackCount(modifierId, stat) < maximumStacks;
        }

        public bool TryApply(
            PlayerStats playerStats,
            PlayerHealth playerHealth)
        {
            Action<float> heal = playerHealth == null
                ? null
                : amount => playerHealth.Heal(amount);
            return TryApplyToModel(playerStats, heal);
        }

        public bool TryApplyToModel(
            CharacterModel model,
            Action<float> heal)
        {
            return TryApplyToModel(model, heal, 1f);
        }

        public bool TryApplyToModel(
            CharacterModel model,
            Action<float> heal,
            float effectMultiplier)
        {
            if (float.IsNaN(effectMultiplier)
                || float.IsInfinity(effectMultiplier)
                || effectMultiplier < 0f)
            {
                return false;
            }

            if (!CanApplyToModel(model)
                || !model.AddModifier(new StatModifier(
                    modifierId,
                    stat,
                    operation,
                    value * effectMultiplier,
                    maximumStacks)))
            {
                return false;
            }

            if (healOnApply > 0f && heal != null)
            {
                heal(healOnApply * effectMultiplier);
            }
            return true;
        }

#if UNITY_EDITOR
        public void Configure(
            string id,
            string label,
            CharacterStat targetStat,
            ModifierOperation modifierOperation,
            float modifierValue,
            int maxStacks,
            float immediateHeal = 0f)
        {
            modifierId = id;
            displayName = label;
            stat = targetStat;
            operation = modifierOperation;
            value = modifierValue;
            maximumStacks = Mathf.Max(1, maxStacks);
            healOnApply = Mathf.Max(0f, immediateHeal);
        }
#endif
    }
}