using System.Collections;
using UnityEngine;
#if DOTWEEN
using DG.Tweening;
#endif

namespace EndingSystem
{
    public class EndingLightController : MonoBehaviour
    {
        [Header("Light Reference")]
        public Light targetLight;

        [Header("Animation Settings")]
        [Tooltip("The final intensity of the light when fully turned on")]
        public float targetIntensity = 5f;
        [Tooltip("How long it takes for the light to reach target intensity")]
        public float fadeDuration = 3f;

#if DOTWEEN
        [Header("DOTween")]
        public Ease fadeEase = Ease.InOutSine;
        private Tween currentTween;
#endif

        private void Awake()
        {
            if (targetLight != null)
            {
                targetLight.intensity = 0f;
                targetLight.enabled = true;
            }
        }

        public void TurnOnLight(bool useUnscaledTime = false)
        {
            if (targetLight != null)
            {
#if DOTWEEN
                PlayFade(useUnscaledTime);
#else
                StartCoroutine(FadeLightCoroutine());
#endif
            }
        }

#if DOTWEEN
        private void OnDisable()
        {
            if (currentTween != null)
            {
                currentTween.Kill(false);
                currentTween = null;
            }
        }

        private void PlayFade(bool useUnscaledTime)
        {
            if (currentTween != null)
            {
                currentTween.Kill(false);
                currentTween = null;
            }

            float duration = Mathf.Max(0.0001f, fadeDuration);
            currentTween = DOTween.To(() => targetLight.intensity, v => targetLight.intensity = v, targetIntensity, duration)
                .SetEase(fadeEase)
                .SetTarget(targetLight)
                .SetUpdate(useUnscaledTime);
        }
#endif

        private IEnumerator FadeLightCoroutine()
        {
            float t = 0f;
            float startIntensity = targetLight.intensity;
            
            while (t < 1f)
            {
                t += Time.deltaTime / fadeDuration;
                targetLight.intensity = Mathf.Lerp(startIntensity, targetIntensity, t);
                yield return null;
            }
            
            targetLight.intensity = targetIntensity;
        }
    }
}