using System;
using OTG.Lab06.Core;
using UnityEngine;

namespace OTG.Lab06.Characters
{
    public sealed class PlayerStats : MonoBehaviour
    {
        [SerializeField] private float health = 100f;
        [SerializeField] private float mana = 100f;

        private ResourceStat healthStat;
        private ResourceStat manaStat;

        public event Action<float, float> HealthChanged;
        public event Action<float, float> ManaChanged;

        public float Health { get { EnsureInitialized(); return healthStat.Current; } }
        public float MaxHealth { get { EnsureInitialized(); return healthStat.Max; } }
        public float Mana { get { EnsureInitialized(); return manaStat.Current; } }
        public float MaxMana { get { EnsureInitialized(); return manaStat.Max; } }

        private void Awake()
        {
            EnsureInitialized();
        }

        private void Start()
        {
            HealthChanged?.Invoke(Health, MaxHealth);
            ManaChanged?.Invoke(Mana, MaxMana);
        }

        public void TakeDamage(float amount)
        {
            EnsureInitialized();
            healthStat.Subtract(amount);
        }

        public void Heal(float amount)
        {
            EnsureInitialized();
            healthStat.Add(amount);
        }

        public bool SpendMana(float amount)
        {
            EnsureInitialized();
            return manaStat.TrySpend(amount);
        }

        public void RestoreMana(float amount)
        {
            EnsureInitialized();
            manaStat.Add(amount);
        }

        private void EnsureInitialized()
        {
            if (healthStat != null && manaStat != null)
            {
                return;
            }

            healthStat = new ResourceStat(health);
            manaStat = new ResourceStat(mana);
            healthStat.Changed += (current, max) => HealthChanged?.Invoke(current, max);
            manaStat.Changed += (current, max) => ManaChanged?.Invoke(current, max);
        }
    }
}