using UnityEngine;

[RequireComponent(typeof(LineRenderer))]
public class ChaseLaserBeam : MonoBehaviour
{
    [Header("Laser Setup")]
    public Transform laserOrigin;
    public float maxDistance = 20f;
    public LayerMask collisionMask;
    public Color laserColor = Color.red;
    public float laserWidth = 0.05f;

    [Header("Visuals")]
    public float scrollSpeed = 1f;
    public float emissionStrength = 5f;

    [Header("Performance")]
    public float updateRate = 0.02f;

    private LineRenderer line;
    private Vector3 laserStart, laserEnd;

    void Awake()
    {
        line = GetComponent<LineRenderer>();
        SetupLaserRenderer();
    }

    void OnEnable()
    {
        line.enabled = true;
        InvokeRepeating(nameof(UpdateLaser), 0f, updateRate);
    }

    void OnDisable()
    {
        CancelInvoke(nameof(UpdateLaser));
        if (line != null)
            line.enabled = false;
    }

    void UpdateLaser()
    {
        laserStart = laserOrigin ? laserOrigin.position : transform.position;
        Vector3 direction = transform.forward;

        if (Physics.Raycast(laserStart, direction, out RaycastHit hit, maxDistance, collisionMask))
        {
            laserEnd = hit.point;

            if (hit.collider.CompareTag("Player"))
            {
                Debug.Log("⚠️ Player hit by chase laser!");

                ChasePlayerController player = hit.collider.GetComponent<ChasePlayerController>();
                if (player != null && !player.waitingForGameOver)
                {
                    player.moveSpeed = 0;
                    player.waitingForGameOver = true;
                    player.StartCoroutine(player.PlayStateAndGameOver(player.fallingStateName, player.fallingShortHash));
                }
                // TODO: Trigger player damage or effects
            }
        }
        else
        {
            laserEnd = laserStart + direction * maxDistance;
        }

        line.enabled = true; // Force enabled in case something disables it
        line.SetPosition(0, laserStart);
        line.SetPosition(1, laserEnd);
    }

    void SetupLaserRenderer()
    {
        line.useWorldSpace = true;
        line.positionCount = 2;
        line.loop = false;
        line.widthMultiplier = laserWidth;
        line.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
        line.receiveShadows = false;

        // Try using custom emissive shader
        Shader laserShader = Shader.Find("Custom/EmissiveLaser");
        if (laserShader != null)
        {
            Material laserMat = new Material(laserShader);
            laserMat.SetColor("_Color", laserColor);
            laserMat.SetFloat("_Emission", emissionStrength);
            laserMat.SetFloat("_ScrollSpeed", scrollSpeed);
            line.material = laserMat;
        }
        else
        {
            // Fallback shader
            Material fallback = new Material(Shader.Find("Sprites/Default"));
            fallback.color = laserColor;
            line.material = fallback;
        }

        line.startColor = laserColor;
        line.endColor = laserColor;
    }
}