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src/Services/ModResourceService.cs

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+using System.Collections.Generic;
+using System.IO;
+using Cthangover.Core.Factories.Impls;
+using Cthangover.Core.Mods;
+using Cthangover.Core.Mods.Resolvers;
+using Godot;
+
+namespace Cthangover.Tools.Services
+{
+    /// <summary>
+    /// Static service for discovering and loading mod background resources.
+    /// Queries <see cref="Files.Collect"/> for files under
+    /// <c>"backgrounds"</c>, strips extensions to produce IDs, and loads textures
+    /// via <see cref="BackgroundFactory"/>. Used by the light editor, interactive
+    /// editor, and scenario editor to populate background selection lists and
+    /// render previews.
+    /// </summary>
+    public static class ModResourceService
+    {
+        /// <summary>
+        /// Returns all unique background IDs (filenames without extension) from
+        /// the <c>"backgrounds"</c> file collection across all installed mods.
+        /// </summary>
+        public static List<string> GetBackgroundIds()
+        {
+            var ids = new List<string>();
+            var files = Files.Collect("backgrounds");
+            var exts = GetExt();
+            
+            foreach (var kvp in files)
+            {
+                var id = kvp.Key;
+                var ext = Path.GetExtension(id);
+                if (!string.IsNullOrWhiteSpace(id) && exts.Contains(ext.ToLower()))
+                {
+                    var cleanId = id.Substring(0, id.LastIndexOf('.'));
+                    if (!cleanId.EndsWith("_albedo") && !cleanId.EndsWith("_depth"))
+                        ids.Add(cleanId);
+                }
+            }
+            
+            return ids;
+        }
+
+        private static HashSet<string> GetExt()
+        {
+            var set = new HashSet<string>();
+            foreach (var ext in ModConfig.Instance.TextureExtensions)
+            {
+                if(string.IsNullOrWhiteSpace(ext))
+                    continue;
+                set.Add(ext.ToLower());
+            }
+            return set;
+        }
+        
+        /// <summary>
+        /// Loads a background texture by ID via <see cref="BackgroundFactory.Instance.Get"/>.
+        /// Returns <c>null</c> on any error (missing resource, load failure).
+        /// </summary>
+        public static Texture2D LoadBackgroundTexture(string id)
+        {
+            try
+            {
+                return BackgroundFactory.Instance.Get(id);
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}