using UnityEngine;
using UnityEngine.UI;

public class HealthBar : MonoBehaviour
{
    [SerializeField] private GameObject container;
    [SerializeField] private Image healthBarFill;
    [SerializeField] private CanvasGroup canvasGroup;

    float lastHitTime;
    private float previousHealth = 1;
    private float normalizedHealth = 1;
    private const float MAX_TIME_ALLOWED = 3.0f;

    public bool ShowBar = true;

    private void Start()
    {
        container.SetActive(false);
    }

    public void SetHealth(float normalizedHealth)
    {
        healthBarFill.color = Color.Lerp(Color.red, Color.green, normalizedHealth);
        healthBarFill.fillAmount = normalizedHealth;
        this.normalizedHealth = normalizedHealth;
    }

    public GameObject GetContainer() => container;
    public CanvasGroup GetCanvasGroup() => canvasGroup;


    //rotate the healthbar so its always looking at the camera.
    private void Update()
    {
        if (Player.Instance != null && container.activeInHierarchy)
        {
            transform.rotation = Quaternion.LookRotation(Player.Instance.GetPlayerFirstPersonCameraPosition() - transform.position);
        }

        if (ShowBar)
        {
            //if the player has hit the enemy within the last 3 seconds. if they've not, disable it
            if (GotHit())
            {
                lastHitTime = Time.time;
                previousHealth = normalizedHealth;
            }

            container.SetActive(Time.time - lastHitTime <= MAX_TIME_ALLOWED);
        }

    }

    private bool GotHit()
    {
        return previousHealth != normalizedHealth;
    }
}