using System;
using OTGIntegrated.Core;
using OTGIntegrated.Talents;
using UnityEngine;

namespace OTGIntegrated.Stats
{
    public sealed class LevelSystem : MonoBehaviour
    {
        [Header("Progression")]
        public int level = 1;
        public int currentExp = 0;
        public int expToNextLevel = 100;

        private TalentManager talentManager;

        public event Action OnExperienceChanged;
        public event Action OnLevelChanged;

        public void Initialize(TalentManager talentManager)
        {
            this.talentManager = talentManager;
            level = Mathf.Max(1, level);
            currentExp = Mathf.Max(0, currentExp);
            expToNextLevel = Mathf.Max(1, expToNextLevel);
        }

        private void Update()
        {
            if (Input.GetKeyDown(KeyCode.X))
            {
                AddExperience(50);
            }
        }

        public void AddExperience(int amount)
        {
            if (amount <= 0)
            {
                return;
            }

            currentExp += amount;
            GameEvents.RaiseExperienceGained(amount);
            GameEvents.RaiseNotification($"Получено опыта: {amount}");

            while (currentExp >= expToNextLevel)
            {
                currentExp -= expToNextLevel;
                LevelUp();
            }

            OnExperienceChanged?.Invoke();
        }

        public void LevelUp()
        {
            level = Mathf.Max(1, level + 1);
            expToNextLevel = Mathf.Max(1, Mathf.RoundToInt(expToNextLevel * 1.25f + 25f));

            if (talentManager != null)
            {
                talentManager.AddTalentPoints(1);
            }

            GameEvents.RaiseLevelUp(level);
            GameEvents.RaiseNotification($"Уровень повышен: {level}");
            OnLevelChanged?.Invoke();
        }

        public float GetNormalizedExp()
        {
            return expToNextLevel <= 0 ? 0f : Mathf.Clamp01((float)currentExp / expToNextLevel);
        }

        public void SetProgress(int savedLevel, int savedExp, int savedExpToNext)
        {
            level = Mathf.Max(1, savedLevel);
            currentExp = Mathf.Max(0, savedExp);
            expToNextLevel = Mathf.Max(1, savedExpToNext);
            OnExperienceChanged?.Invoke();
            OnLevelChanged?.Invoke();
        }
    }
}