Fixed invisible file attachments in assistant plugins & allow file attachment component (#877)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/PluginSystem/Assistants/DataModel/AssistantFileAttachments.cs

@@ -0,0 +1,66 @@
+using System.Text;
+using AIStudio.Assistants.Dynamic;
+
+namespace AIStudio.Tools.PluginSystem.Assistants.DataModel;
+
+internal sealed class AssistantFileAttachment : StatefulAssistantComponentBase
+{
+    public override AssistantComponentType Type => AssistantComponentType.FILE_ATTACHMENTS;
+    public override Dictionary<string, object> Props { get; set; } = new();
+    public override List<IAssistantComponent> Children { get; set; } = new();
+
+    public string Heading
+    {
+        get => AssistantComponentPropHelper.ReadString(this.Props, nameof(this.Heading));
+        set => AssistantComponentPropHelper.WriteString(this.Props, nameof(this.Heading), value);
+    }
+
+    public bool CatchAllDocuments
+    {
+        get => AssistantComponentPropHelper.ReadBool(this.Props, nameof(this.CatchAllDocuments), true);
+        set => AssistantComponentPropHelper.WriteBool(this.Props, nameof(this.CatchAllDocuments), value);
+    }
+
+    public bool UseSmallForm
+    {
+        get => AssistantComponentPropHelper.ReadBool(this.Props, nameof(this.UseSmallForm));
+        set => AssistantComponentPropHelper.WriteBool(this.Props, nameof(this.UseSmallForm), value);
+    }
+
+    public string Class
+    {
+        get => AssistantComponentPropHelper.ReadString(this.Props, nameof(this.Class));
+        set => AssistantComponentPropHelper.WriteString(this.Props, nameof(this.Class), value);
+    }
+
+    public string Style
+    {
+        get => AssistantComponentPropHelper.ReadString(this.Props, nameof(this.Style));
+        set => AssistantComponentPropHelper.WriteString(this.Props, nameof(this.Style), value);
+    }
+
+    #region Implementation of IStatefulAssistantComponent
+
+    public override void InitializeState(AssistantState state)
+    {
+        if (!state.FileAttachments.ContainsKey(this.Name))
+            state.FileAttachments[this.Name] = new FileAttachmentState();
+    }
+
+    public override string UserPromptFallback(AssistantState state)
+    {
+        state.FileAttachments.TryGetValue(this.Name, out var fileState);
+
+        if (fileState == null || fileState.DocumentPaths.Count == 0)
+            return this.BuildAuditPromptBlock(null);
+
+        var builder = new StringBuilder();
+
+        foreach (var attachment in fileState.DocumentPaths.OrderBy(static attachment => attachment.FilePath, StringComparer.Ordinal))
+            builder.AppendLine(attachment.FilePath);
+
+        return this.BuildAuditPromptBlock(builder.ToString());
+    }
+
+    #endregion
+}