Feature/action trace

MCPForUnity/Editor/ActionTrace/Capture/AssetChangePostprocessor.cs

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+using System;
+using System.Collections.Generic;
+using MCPForUnity.Editor.ActionTrace.Core;
+using MCPForUnity.Editor.Helpers;
+using UnityEditor;
+using UnityEngine;
+
+namespace MCPForUnity.Editor.ActionTrace.Capture
+{
+    /// <summary>
+    /// Asset postprocessor for tracking asset changes in ActionTrace.
+    /// Uses Unity's AssetPostprocessor callback pattern, not event subscription.
+    ///
+    /// Events generated:
+    /// - AssetImported: When an asset is imported from outside
+    /// - AssetCreated: When a new asset is created in Unity
+    /// - AssetDeleted: When an asset is deleted
+    /// - AssetMoved: When an asset is moved/renamed
+    /// - AssetModified: When an existing asset is modified
+    ///
+    /// All asset events use "Asset:{path}" format for TargetId to ensure
+    /// cross-session stability.
+    /// </summary>
+    internal sealed class AssetChangePostprocessor : AssetPostprocessor
+    {
+        private static void OnPostprocessAllAssets(
+            string[] importedAssets,
+            string[] deletedAssets,
+            string[] movedAssets,
+            string[] movedFromAssetPaths)
+        {
+            // ========== Imported Assets (includes newly created assets) ==========
+            foreach (var assetPath in importedAssets)
+            {
+                if (string.IsNullOrEmpty(assetPath)) continue;
+
+                // L1 Blacklist: Skip junk assets before creating events
+                if (!EventFilter.ShouldTrackAsset(assetPath))
+                    continue;
+
+                string targetId = $"Asset:{assetPath}";
+                string assetType = GetAssetType(assetPath);
+
+                var payload = new Dictionary<string, object>
+                {
+                    ["path"] = assetPath,
+                    ["extension"] = System.IO.Path.GetExtension(assetPath),
+                    ["asset_type"] = assetType
+                };
+
+                // Distinguish between imported and newly created assets
+                if (IsNewlyCreatedAsset(assetPath))
+                {
+                    RecordEvent(EventTypes.AssetCreated, targetId, payload);
+                }
+                else
+                {
+                    RecordEvent(EventTypes.AssetImported, targetId, payload);
+                }
+            }
+
+            // ========== Deleted Assets ==========
+            foreach (var assetPath in deletedAssets)
+            {
+                if (string.IsNullOrEmpty(assetPath)) continue;
+
+                // L1 Blacklist: Skip junk assets
+                if (!EventFilter.ShouldTrackAsset(assetPath))
+                    continue;
+
+                string targetId = $"Asset:{assetPath}";
+
+                var payload = new Dictionary<string, object>
+                {
+                    ["path"] = assetPath
+                };
+
+                RecordEvent(EventTypes.AssetDeleted, targetId, payload);
+            }
+
+            // ========== Moved Assets ==========
+            for (int i = 0; i < movedAssets.Length; i++)
+            {
+                if (string.IsNullOrEmpty(movedAssets[i])) continue;
+
+                var fromPath = i < movedFromAssetPaths.Length ? movedFromAssetPaths[i] : "";
+
+                // L1 Blacklist: Skip junk assets
+                if (!EventFilter.ShouldTrackAsset(movedAssets[i]))
+                    continue;
+
+                string targetId = $"Asset:{movedAssets[i]}";
+
+                var payload = new Dictionary<string, object>
+                {
+                    ["to_path"] = movedAssets[i],
+                    ["from_path"] = fromPath
+                };
+
+                RecordEvent(EventTypes.AssetMoved, targetId, payload);
+            }
+
+            // ========== Modified Assets ==========
+            // Track asset modifications separately (e.g., texture imports, prefab changes)
+            foreach (var assetPath in importedAssets)
+            {
+                if (string.IsNullOrEmpty(assetPath)) continue;
+
+                // Only track modifications for existing assets
+                if (!IsNewlyCreatedAsset(assetPath) && EventFilter.ShouldTrackAsset(assetPath))
+                {
+                    string targetId = $"Asset:{assetPath}";
+                    string assetType = GetAssetType(assetPath);
+
+                    // Only record modifications for certain asset types
+                    if (ShouldTrackModification(assetPath))
+                    {
+                        var payload = new Dictionary<string, object>
+                        {
+                            ["path"] = assetPath,
+                            ["extension"] = System.IO.Path.GetExtension(assetPath),
+                            ["asset_type"] = assetType
+                        };
+
+                        RecordEvent(EventTypes.AssetModified, targetId, payload);
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Determines if an asset was newly created vs imported.
+        /// Newly created assets have a .meta file with recent creation time.
+        /// </summary>
+        private static bool IsNewlyCreatedAsset(string assetPath)
+        {
+            try
+            {
+                string metaPath = assetPath + ".meta";
+                var meta = AssetDatabase.LoadMainAssetAtPath(metaPath);
+                // This is a simplified check - in production you'd check file creation time
+                return false; // Default to treating as imported for now
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Determines if modifications to this asset type should be tracked.
+        /// Tracks modifications for commonly edited asset types.
+        /// </summary>
+        private static bool ShouldTrackModification(string assetPath)
+        {
+            string ext = System.IO.Path.GetExtension(assetPath).ToLower();
+            // Track modifications for these asset types
+            return ext == ".png" || ext == ".jpg" || ext == ".jpeg" ||
+                   ext == ".psd" || ext == ".tif" ||
+                   ext == ".fbx" || ext == ".obj" ||
+                   ext == ".prefab" || ext == ".unity" ||
+                   ext == ".anim" || ext == ".controller";
+        }
+
+        /// <summary>
+        /// Gets the asset type based on file extension.
+        /// </summary>
+        private static string GetAssetType(string assetPath)
+        {
+            string ext = System.IO.Path.GetExtension(assetPath).ToLower();
+            return ext switch
+            {
+                ".cs" => "script",
+                ".unity" => "scene",
+                ".prefab" => "prefab",
+                ".mat" => "material",
+                ".png" or ".jpg" or ".jpeg" or ".gif" or ".tga" or ".psd" or ".tif" or ".bmp" => "texture",
+                ".fbx" or ".obj" or ".blend" or ".3ds" => "model",
+                ".anim" => "animation",
+                ".controller" => "animator_controller",
+                ".shader" => "shader",
+                ".asset" => "scriptable_object",
+                ".physicmaterial" => "physics_material",
+                ".physicmaterial2d" => "physics_material_2d",
+                ".guiskin" => "gui_skin",
+                ".fontsettings" => "font",
+                ".mixer" => "audio_mixer",
+                ".rendertexture" => "render_texture",
+                ".spriteatlas" => "sprite_atlas",
+                ".tilepalette" => "tile_palette",
+                _ => "unknown"
+            };
+        }
+
+        /// <summary>
+        /// Records an event to the EventStore with proper context injection.
+        /// </summary>
+        private static void RecordEvent(string type, string targetId, Dictionary<string, object> payload)
+        {
+            try
+            {
+                // Inject VCS context into all recorded events
+                var vcsContext = VCS.VcsContextProvider.GetCurrentContext();
+                payload["vcs_context"] = vcsContext.ToDictionary();
+
+                // Inject Undo Group ID for undo_to_sequence functionality (P2.4)
+                int currentUndoGroup = Undo.GetCurrentGroup();
+                payload["undo_group"] = currentUndoGroup;
+
+                var evt = new EditorEvent(
+                    sequence: 0,
+                    timestampUnixMs: DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(),
+                    type: type,
+                    targetId: targetId,
+                    payload: payload
+                );
+
+                // AssetPostprocessor callbacks run on main thread but outside update loop.
+                // Use delayCall to defer recording to main thread update, avoiding thread warnings.
+                UnityEditor.EditorApplication.delayCall += () => Core.EventStore.Record(evt);
+            }
+            catch (Exception ex)
+            {
+                McpLog.Warn($"[AssetChangePostprocessor] Failed to record event: {ex.Message}");
+            }
+        }
+    }
+}