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

// Code sourced from Jason Welmann's tutorial "Health Bars in Unity3D - Quick, Clean, Easy" https://www.youtube.com/watch?v=CA2snUe7ARM&ab_channel=JasonWeimann
public class HealthBar : MonoBehaviour
{
    [SerializeField]
    private Image foregroundImage;
    [SerializeField]
    private float updateSpeedSeconds = 0.5f;

    private void Awake()
    {
        GetComponentInParent<Enemy>().OnHealthChanged += HandleHealthChanged;
    }

    private void HandleHealthChanged(float pct)
    {
        StartCoroutine(ChangeToPct(pct));
    }

    private IEnumerator ChangeToPct(float pct)
    {
        float preChangePct = foregroundImage.fillAmount;
        float elapsed = 0f;

        while (elapsed < updateSpeedSeconds)
        {
            elapsed += Time.deltaTime;
            foregroundImage.fillAmount = Mathf.Lerp(preChangePct, pct, elapsed / updateSpeedSeconds);
            yield return null;
        }

        foregroundImage.fillAmount = pct;
    }

    private void LateUpdate()
    {
        transform.LookAt(GameObject.Find("OmniCharacterController/CameraSetupParent/CameraSetupRootOffset/[CameraRig]/Camera").transform);
        transform.Rotate(0, 180, 0);
    }

}