using System;
using System.Collections.Generic;
using SepCore.Definition;
using UnityEngine;

namespace SepCore.Components
{
    public class StatComponent : MonoBehaviour
    {
        private readonly Dictionary<StatType, List<modifier>> _statModifiers = new();
        private readonly Dictionary<StatType, Action<modifier, bool>> _statModifierCallbacks = new();

        public void OnInit()
        {
        }

        public void OnReset()
        {
            _statModifiers.Clear();
            _statModifierCallbacks.Clear();
        }

        public void AddModifier(modifier modifier)
        {
            if (!_statModifiers.TryGetValue(modifier.StatType, out var modifiers))
            {
                modifiers = new List<modifier>();
                _statModifiers.Add(modifier.StatType, modifiers);
            }
            modifiers.Add(modifier);

            if (_statModifierCallbacks.TryGetValue(modifier.StatType, out var callbacks))
                callbacks?.Invoke(modifier, true);
        }

        public void RemoveModifier(modifier modifier)
        {
            if (_statModifiers.TryGetValue(modifier.StatType, out var modifiers))
            {
                modifiers.Remove(modifier);
            }

            if (_statModifierCallbacks.TryGetValue(modifier.StatType, out var callbacks))
                callbacks?.Invoke(modifier, false);
        }

        public void Subscribe(StatType statType, Action<modifier, bool> callback)
        {
            if (!_statModifierCallbacks.TryAdd(statType, callback))
            {
                _statModifierCallbacks[statType] += callback;
            }
        }

        public void Unsubscribe(StatType statType, Action<modifier, bool> callback)
        {
            if (!_statModifierCallbacks.TryGetValue(statType, out var callbacks))
            {
                return;
            }

            callbacks -= callback;
            if (callbacks == null)
            {
                _statModifierCallbacks.Remove(statType);
            }
        }

        public StatProperty GetStat(StatType statType)
        {
            var result = new StatProperty();

            if (!_statModifiers.TryGetValue(statType, out var modifiers)) return result;

            foreach (var modifier in modifiers)
            {
                if (modifier.IsPercent) result.Percent += modifier.RealValue;
                else result.Value += modifier.RealValue;
            }

            return result;
        }

        public void UpdateStat(StatProperty stat, modifier modifier, bool isApply)
        {
            float coef = isApply ? 1f : -1f;
            if (modifier.IsPercent)
            {
                stat.Percent += modifier.RealValue * coef;
            }
            else
            {
                stat.Value += modifier.RealValue * coef;
            }
        }
    }
}