using System.Collections;
using System.Collections.Generic;
//using UnityEditor.PackageManager;
using UnityEngine;
using UnityEngine.Events;

public class HealthSystem : MonoBehaviour
{
    private StatusEffects statusEffects;
    private float hp;
    private bool dead = false;

    [SerializeField]
    private List<string> bannedTags;

    [SerializeField]
    private UnityEvent OnDamageTaken;

    [SerializeField]
    private UnityEvent OnRegenerate;

    [SerializeField]
    private UnityEvent OnDeath;

    private UpdateManager updateManager;

    private IUpdatable[] updatables;

    public bool immortal = false;

    void Start()
    {
        statusEffects = GetComponent<StatusEffects>();
        updatables = GetComponents<IUpdatable>();
        if (statusEffects == null)
        {
            Debug.LogWarning("No status efffect script in this object!");
            return;
        }
        hp = statusEffects.maxHp;
        GameObject t = GameObject.Find("UpdateManager");
        if (t)
        {
            updateManager = t.GetComponent<UpdateManager>();
        }
        
    }

    public float GetHealth() { return hp; }
    public void EditHealth(float value)
    {
        hp = value;
    }
    public void TakeDamage(float value, GameObject source)
    {
        if(value < 0)
        {
            Debug.LogError("Take damage only accepts positive values");
            return;
        }
        if (immortal) return;
        foreach(string t in bannedTags)
        {
            if (source)
            {
                if (t == source.tag) return;
            }
        }
        if(statusEffects.shield > 0)
        {
            if(statusEffects.shield >= value )
                statusEffects.shield -= value;
            else
            {
                hp += statusEffects.shield - value;
                statusEffects.shield = 0;
            }
        }
        else { hp -= value; }
        if(hp <= 0)
        {
            Die();
        }
        OnDamageTaken.Invoke();        
    }
    public void Die()
    {
        dead = true;
        //Debug.Log("The player went to sleep... Forever.");
        OnDeath.Invoke();
    }

    public void Destroy()
    {
        if (updateManager != null)
        {
            foreach (IUpdatable i in updatables)
            {
                updateManager.RemoveFromList(i);
            }
        }
        Destroy(gameObject);
    }
    public void Regenerate(float value)
    {
        if (value < 0)
        {
            Debug.LogError("Regenerate only accepts positive values");
            return;
        }
        hp += value;
        OnRegenerate.Invoke();
    }

    public float GetHealthPercentage()
    {

        return (hp / statusEffects.maxHp);
    }

    public float GetMaxHealth()
    {
        return statusEffects.maxHp;
    }
}