// GroundMarkerPulse.cs
// Zweck: Pulsierender Bodenmarker (Skalierung + optionale Farb/Emission-Pulse).
using UnityEngine;

public class GroundMarkerPulse : MonoBehaviour
{
    [Header("Scale Pulse")]
    public float minScale = 0.8f;
    public float maxScale = 1.2f;
    public float pulseSpeed = 2f;

    [Header("Color Pulse (optional)")]
    public Color baseColor = Color.cyan;
    public Color pulseColor = Color.white;
    public float colorPulseStrength = 0.5f; // 0=kein Farb-Puls

    private Vector3 _initialScale;
    private Material _mat;
    private Color _originalMatColor;

    private void Start()
    {
        _initialScale = transform.localScale;

        var renderer = GetComponent<Renderer>();
        if (renderer != null)
        {
            _mat = renderer.material;          // eigene Instanz
            _originalMatColor = _mat.color;
            _mat.color = baseColor;
        }
    }

    private void Update()
    {
        // Skalenpuls
        float t = (Mathf.Sin(Time.time * pulseSpeed) + 1f) * 0.5f;
        float scaleFactor = Mathf.Lerp(minScale, maxScale, t);
        transform.localScale = new Vector3(
            _initialScale.x * scaleFactor,
            _initialScale.y,
            _initialScale.z * scaleFactor
        );

        // Farbpuls (optional)
        if (_mat != null && colorPulseStrength > 0f)
        {
            Color target = Color.Lerp(baseColor, pulseColor, t);
            _mat.color = Color.Lerp(baseColor, target, colorPulseStrength);

            if (_mat.IsKeywordEnabled("_EMISSION"))
                _mat.SetColor("_EmissionColor", target);
        }
    }
}