using UnityEngine;

[ExecuteAlways]
public class MercuryAtmosphereSystem : MonoBehaviour
{
    public float mercuryRadiusUnits = 2.4395f;
    public float heightMultiplier = 8f;

    void OnEnable()
    {
        if (!Application.isPlaying && transform.childCount == 0)
            BuildLayers();
    }

    [ContextMenu("Перебудувати шари")]
    public void BuildLayers()
    {
        for (int i = transform.childCount - 1; i >= 0; i--)
        {
            Transform child = transform.GetChild(i);
            if (child.name.StartsWith("Layer_"))
            {
                if (Application.isPlaying) Destroy(child.gameObject);
                else DestroyImmediate(child.gameObject);
            }
        }

        CreateLayer();
    }

    void CreateLayer()
    {
        float radiusUnits = mercuryRadiusUnits + (2000f / 1000f) * heightMultiplier;

        GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        obj.name = "Layer_Exosphere";
        obj.transform.parent = this.transform;
        obj.transform.localPosition = Vector3.zero;
        obj.transform.localScale = Vector3.one * radiusUnits * 2f;

        if (Application.isPlaying) Destroy(obj.GetComponent<Collider>());
        else DestroyImmediate(obj.GetComponent<Collider>());

        Material mat = new Material(Shader.Find("Custom/AtmosphereLayer"));
        mat.SetColor("_RimColor", new Color(1f, 0.75f, 0.2f));
        mat.SetColor("_CoreColor", new Color(0.8f, 0.4f, 0.0f));
        mat.SetFloat("_RimPower", 1.8f);
        mat.SetFloat("_RimIntensity", 4f);
        mat.SetFloat("_CoreIntensity", 0.8f);
        mat.SetFloat("_PulseSpeed", 0.5f);
        mat.SetFloat("_PulseStrength", 0.3f);

        obj.GetComponent<Renderer>().material = mat;
    }

    public void SetIntensity(float level)
    {
        Transform layer = transform.Find("Layer_Exosphere");
        if (layer == null) return;

        Renderer r = layer.GetComponent<Renderer>();
        if (r == null) return;

        r.material.SetFloat("_RimIntensity", Mathf.Lerp(0f, 4f, level));
        r.material.SetFloat("_CoreIntensity", Mathf.Lerp(0f, 0.8f, level));
    }
}