using UnityEngine;

[ExecuteAlways]
public class AdjustableGlowOrb : MonoBehaviour
{
    [SerializeField] private Color glowColor = new Color(0.1f, 0.65f, 1f, 1f);
    [SerializeField, Min(0f)] private float emissionIntensity = 2.5f;
    [SerializeField, Range(0f, 1f)] private float haloAlpha = 0.25f;
    [SerializeField] private Renderer targetRenderer;
    [Tooltip("光晕等附属渲染器，留空时自动收集子级（排除主体球）")]
    [SerializeField] private Renderer[] haloRenderers;

    private MaterialPropertyBlock propertyBlock;

    private void OnEnable()
    {
        ApplyVisuals();
    }

    private void OnValidate()
    {
        ApplyVisuals();
    }

    public void SetGlowColor(Color color)
    {
        glowColor = color;
        ApplyVisuals();
    }

    public Color GetGlowColor() => glowColor;

    private void ApplyVisuals()
    {
        if (targetRenderer == null)
        {
            targetRenderer = GetComponent<Renderer>();
        }

        if (haloRenderers == null || haloRenderers.Length == 0)
        {
            haloRenderers = GetComponentsInChildren<Renderer>(true);
            for (int i = 0; i < haloRenderers.Length; i++)
            {
                if (haloRenderers[i] == targetRenderer)
                {
                    haloRenderers[i] = null;
                }
            }
        }

        if (targetRenderer != null)
        {
            propertyBlock ??= new MaterialPropertyBlock();
            targetRenderer.GetPropertyBlock(propertyBlock);
            Color emission = glowColor * emissionIntensity;
            propertyBlock.SetColor("_BaseColor", glowColor);
            propertyBlock.SetColor("_Color", glowColor);
            propertyBlock.SetColor("_EmissionColor", emission);
            targetRenderer.SetPropertyBlock(propertyBlock);
        }

        if (haloRenderers == null) return;
        propertyBlock ??= new MaterialPropertyBlock();
        Color haloTint = new Color(glowColor.r, glowColor.g, glowColor.b, haloAlpha);
        foreach (Renderer halo in haloRenderers)
        {
            if (halo == null) continue;
            halo.GetPropertyBlock(propertyBlock);
            // Legacy Shaders/Particles/Additive 用 _TintColor 作为颜色入口
            propertyBlock.SetColor("_TintColor", haloTint);
            propertyBlock.SetColor("_Color", haloTint);
            halo.SetPropertyBlock(propertyBlock);
        }
    }
}