#if UNITY_EDITOR
using System.IO;
using UnityEditor;
using UnityEngine;

/// <summary>
/// Editor utility that builds ready-to-use materials from the Rainbow-Cats
/// "Unity Dissolve HDR Shaders" pack. We resolve shaders through Shader.Find so
/// Unity fills in each graph's real fileID + default property values — hand-writing
/// a .mat's shader reference is error-prone and usually ends in a pink material.
/// Menu: Tools > Rainbow Dissolve > Create Materials
/// </summary>
public static class RainbowDissolveMaterialCreator
{
    // Shader Graph registers its shader name as "<m_Path>/<asset file name>".
    private const string DissolveUrpShaderName = "Shader Graphs/Dissolve Lit URP Shader";
    private const string OutlineUrpShaderName = "Shader Graphs/HDR Outline Lit URP Shader";
    private const string DissolveHdrpShaderName = "Shader Graphs/Dissolve Lit HDRP Shader";

    private const string OutputFolder = "Assets/Rainbow-Cats-Unity-Dissolve-HDR-Shaders-main/Materials";

    [MenuItem("Tools/Rainbow Dissolve/Create Materials")]
    public static void CreateMaterials()
    {
        EnsureFolder(OutputFolder);

        // URP shaders (this project is URP 17). HDRP variant is created only if that
        // shader compiles in the current pipeline, otherwise it would be pink.
        CreateMaterial(DissolveUrpShaderName, "M_Dissolve_URP");
        CreateMaterial(OutlineUrpShaderName, "M_HDROutline_URP");
        CreateMaterial(DissolveHdrpShaderName, "M_Dissolve_HDRP");

        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }

    private static void CreateMaterial(string shaderName, string materialName)
    {
        Shader shader = Shader.Find(shaderName);
        if (shader == null)
        {
            Debug.LogWarning($"[RainbowDissolve] Shader not found: \"{shaderName}\". " +
                             "Skipped (likely a different render pipeline or the graph hasn't imported yet).");
            return;
        }

        string path = $"{OutputFolder}/{materialName}.mat";
        var material = new Material(shader) { name = materialName };
        AssetDatabase.CreateAsset(material, AssetDatabase.GenerateUniqueAssetPath(path));
        Debug.Log($"[RainbowDissolve] Created material {path} using shader \"{shaderName}\".", material);
    }

    private static void EnsureFolder(string assetFolder)
    {
        if (AssetDatabase.IsValidFolder(assetFolder))
        {
            return;
        }

        string parent = Path.GetDirectoryName(assetFolder).Replace('\\', '/');
        string leaf = Path.GetFileName(assetFolder);
        if (!AssetDatabase.IsValidFolder(parent))
        {
            EnsureFolder(parent);
        }

        AssetDatabase.CreateFolder(parent, leaf);
    }
}
#endif