using System;
using UnityEngine;

public class PlayerHealthController : MonoBehaviour
{
    public static PlayerHealthController Instance { get; private set; }

    [SerializeField] private int maxHealth = 100;
    private int currentHealth;

    public event Action<int, int> OnHealthChanged;
    public event Action OnPlayerDied;

    public int CurrentHealth => currentHealth;
    public int MaxHealth => maxHealth;
    public bool IsDead => currentHealth <= 0;

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
        }
    }

    private void Start()
    {
        currentHealth = maxHealth;
        OnHealthChanged?.Invoke(currentHealth, maxHealth);
    }

    public void TakeDamage(int damageAmount)
    {
        if (currentHealth <= 0) return;

        currentHealth = Mathf.Max(0, currentHealth - damageAmount);
        OnHealthChanged?.Invoke(currentHealth, maxHealth);

        if (currentHealth <= 0)
        {
            Die();
        }
    }

    public void Heal(int healAmount)
    {
        if (currentHealth <= 0) return;

        currentHealth = Mathf.Min(maxHealth, currentHealth + healAmount);
        OnHealthChanged?.Invoke(currentHealth, maxHealth);
    }

    private void Die()
    {
        OnPlayerDied?.Invoke();
        if (UIController.Instance != null)
        {
            UIController.Instance.ShowGameOverScreen();
        }
    }
}