using UnityEngine;
using UnityEngine.InputSystem;

namespace KirbyAdventures
{
    public class LightAbility : MonoBehaviour
    {
        public float Range = 18f;
        public float Cooldown = 0.75f;
        public Transform Origin;
        public LayerMask HitMask = ~0;

        float _nextReadyTime;
        LineRenderer _line;
        float _flashUntil;

        void Awake()
        {
            _line = gameObject.AddComponent<LineRenderer>();
            _line.positionCount = 2;
            _line.startWidth = 0.08f;
            _line.endWidth = 0.02f;
            _line.material = new Material(Shader.Find("Sprites/Default"));
            _line.startColor = new Color(1f, 0.95f, 0.6f, 1f);
            _line.endColor = new Color(1f, 0.85f, 0.2f, 0.2f);
            _line.enabled = false;
        }

        void Update()
        {
            if (GameFlow.Instance != null && (GameFlow.Instance.IsPaused || GameFlow.Instance.HasWon))
                return;

            if (_line.enabled && Time.time > _flashUntil)
                _line.enabled = false;

            bool unlocked = GameFlow.Instance == null || GameFlow.Instance.LightAbilityUnlocked;
            if (!unlocked) return;
            if (Time.time < _nextReadyTime) return;

            var mouse = Mouse.current;
            var kb = Keyboard.current;
            bool fire = (mouse != null && mouse.leftButton.wasPressedThisFrame) ||
                        (kb != null && kb.eKey.wasPressedThisFrame);
            if (fire)
                Fire();
        }

        void Fire()
        {
            _nextReadyTime = Time.time + Cooldown;

            Transform origin = Origin != null ? Origin : transform;
            Vector3 start = origin.position + Vector3.up * 1.0f;
            Vector3 dir = origin.forward;
            if (Camera.main != null)
                dir = Camera.main.transform.forward;

            Vector3 end = start + dir * Range;
            if (Physics.Raycast(start, dir, out RaycastHit hit, Range, HitMask, QueryTriggerInteraction.Collide))
            {
                end = hit.point;
                var reactive = hit.collider.GetComponentInParent<ILightReactive>();
                reactive?.OnHitByLight(hit.point, dir);
            }

            _line.SetPosition(0, start);
            _line.SetPosition(1, end);
            _line.enabled = true;
            _flashUntil = Time.time + 0.12f;
        }
    }
}