using System.Collections;
using UnityEngine;
using UnityEngine.VFX;

namespace Beyond
{
    [CreateAssetMenu(menuName = "Magic/Spells/Scan")]
    public class ScanSpell : SpellDefinition
    {
        public GameObject effectPrefab;
        public float maxRange = 50f;
        public float scanDuration = 2f; // time for wave to travel
        public float startDelay = 0.6f;

        public override void Cast(MagicAttacks caster, Transform target)
        {
            caster.StartCoroutine(CastRoutine(caster));
        }

        private IEnumerator CastRoutine(MagicAttacks caster)
        {
            yield return new WaitForSeconds(startDelay);
            // Instantiate visual
            GameObject instance = Instantiate(effectPrefab, caster.transform.position, Quaternion.identity);
            VisualEffect vfx = instance.GetComponent<VisualEffect>();
            if (vfx) vfx.Play();

            // Shader Logic
            float speed = maxRange / scanDuration;
            float timer = 0f;

            while (timer < scanDuration)
            {
                Shader.SetGlobalFloat("_WaveTime", speed * timer);
                timer += Time.deltaTime;
                yield return null;
            }
            Shader.SetGlobalFloat("_WaveTime", 0f);

            // Detection Logic
            int mask = 1 << LayerMask.NameToLayer("Triggers") | 1 << LayerMask.NameToLayer("HiddenObject");
            var colliders = Physics.OverlapSphere(caster.transform.position, maxRange, mask);
            foreach (var c in colliders)
            {
                var h = c.gameObject.GetComponent<IScannable>();
                if (h != null) h.OnScanned();
            }

            Destroy(instance);
        }
    }
}