Added the possibility to attach files to the chat (#585)

Co-authored-by: Thorsten Sommer

app/MindWork AI Studio/Tools/Services/PandocAvailabilityService.cs

@@ -0,0 +1,85 @@
+using AIStudio.Dialogs;
+using AIStudio.Tools.PluginSystem;
+
+using DialogOptions = AIStudio.Dialogs.DialogOptions;
+
+namespace AIStudio.Tools.Services;
+
+/// <summary>
+/// Service to check Pandoc availability and ensure installation.
+/// This service encapsulates the logic for checking if Pandoc is installed
+/// and showing the installation dialog if needed.
+/// </summary>
+public sealed class PandocAvailabilityService(RustService rustService, IDialogService dialogService, ILogger<PandocAvailabilityService> logger)
+{
+    private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(PandocAvailabilityService).Namespace, nameof(PandocAvailabilityService));
+
+    private RustService RustService => rustService;
+    
+    private IDialogService DialogService => dialogService;
+    
+    private ILogger<PandocAvailabilityService> Logger => logger;
+
+    private PandocInstallation? cachedInstallation;
+
+    /// <summary>
+    /// Checks if Pandoc is available and shows the installation dialog if needed.
+    /// </summary>
+    /// <param name="showSuccessMessage">Whether to show a success message if Pandoc is available.</param>
+    /// <param name="showDialog">Whether to show the installation dialog if Pandoc is not available.</param>
+    /// <returns>The Pandoc installation state.</returns>
+    public async Task<PandocInstallation> EnsureAvailabilityAsync(bool showSuccessMessage = false, bool showDialog = true)
+    {
+        // Check if Pandoc is available:
+        var pandocState = await Pandoc.CheckAvailabilityAsync(this.RustService, showMessages: false, showSuccessMessage: showSuccessMessage);
+
+        // Cache the result:
+        this.cachedInstallation = pandocState;
+
+        // If not available, show installation dialog:
+        if (!pandocState.IsAvailable && showDialog)
+        {
+            var dialogParameters = new DialogParameters<PandocDialog>
+            {
+                { x => x.ShowInitialResultInSnackbar, false },
+            };
+
+            var dialogReference = await this.DialogService.ShowAsync<PandocDialog>(TB("Pandoc Installation"), dialogParameters, DialogOptions.FULLSCREEN);
+            await dialogReference.Result;
+
+            // Re-check availability after dialog:
+            pandocState = await Pandoc.CheckAvailabilityAsync(this.RustService, showMessages: showSuccessMessage, showSuccessMessage: showSuccessMessage);
+            this.cachedInstallation = pandocState;
+
+            if (!pandocState.IsAvailable)
+            {
+                this.Logger.LogError("Pandoc is not available after installation attempt.");
+                await MessageBus.INSTANCE.SendError(new(Icons.Material.Filled.Cancel, TB("Pandoc may be required for importing files.")));
+            }
+        }
+
+        return pandocState;
+    }
+
+    /// <summary>
+    /// Checks if Pandoc is available without showing any dialogs or messages.
+    /// Uses cached result if available to avoid redundant checks.
+    /// </summary>
+    /// <returns>True if Pandoc is available, false otherwise.</returns>
+    public async Task<bool> IsAvailableAsync()
+    {
+        if (this.cachedInstallation.HasValue)
+            return this.cachedInstallation.Value.IsAvailable;
+
+        var pandocState = await Pandoc.CheckAvailabilityAsync(this.RustService, showMessages: false, showSuccessMessage: false);
+        this.cachedInstallation = pandocState;
+
+        return pandocState.IsAvailable;
+    }
+
+    /// <summary>
+    /// Clears the cached Pandoc installation state.
+    /// Useful when the installation state might have changed.
+    /// </summary>
+    public void ClearCache() => this.cachedInstallation = null;
+}