using System;
using System.Collections.Generic;
using UnityEngine;

public class Health : MonoBehaviour
{
    public float Hp { get; private set; }
    public float MaxHp { get; private set; }
    public float HpPercent => Hp / MaxHp;

    public event Action<float> HealthChanged;
    public event Action<float> Damaged;
    //public event Action<float> Healed;
    public event Action<Vector3> Died;
    public bool Alive { get; private set; }

    private bool Initialized = false;
    private List<Hitbox> CachedHitboxes;

    public void Initialize(float maxHp, List<Hitbox> hitboxes)
    {
        if(Initialized) return;

        Hp = maxHp;
        MaxHp = maxHp;
        Alive = true;

        CachedHitboxes = hitboxes;
        SubscribeOnHitBoxes();

        Initialized = true; 
    }

    private void SubscribeOnHitBoxes()
    {
        foreach(var hitbox in CachedHitboxes)
            hitbox.OnDamage += TakeDamage;
    }
    private void UnsubscribeFromHitboxes() 
    {
        if(CachedHitboxes == null) return;
        foreach (var hitbox in CachedHitboxes) 
            hitbox.OnDamage -= TakeDamage; 
    }


    private void TakeDamage(float damage, Vector3 damagePosition)
    {
        if (!Initialized) return;
        if (!Alive) return;
        if (damage <= 0) return;

        float oldHp = Hp;
        Hp = Math.Clamp(Hp - damage, 0, MaxHp);

        float consumedDamage = oldHp - Hp;

        if (Hp <= 0)
        {
            Alive = false;
            UnsubscribeFromHitboxes();
            Died?.Invoke(damagePosition);
        }

        Damaged?.Invoke(consumedDamage);
        HealthChanged?.Invoke(Hp);
    }

    private void OnDestroy()
    {
        UnsubscribeFromHitboxes();
    }
}