From 017bbd99ddccc7025a6657f267b3b679ad71b154 Mon Sep 17 00:00:00 2001
From: Flaky <git@flaky.blue>
Date: Sat, 10 Jan 2026 16:32:13 +0000
Subject: [PATCH] implement exporting

---
 UI/ViewModels/MainWindowViewModel.cs | 22 ++++++++++++++++++++++
 UI/Views/MainWindow.axaml            |  4 ++--
 UI/Views/MainWindow.axaml.cs         | 28 +++++++++++++++++++++++++++-
 3 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/UI/ViewModels/MainWindowViewModel.cs b/UI/ViewModels/MainWindowViewModel.cs
index cf616b0..60f5349 100644
--- a/UI/ViewModels/MainWindowViewModel.cs
+++ b/UI/ViewModels/MainWindowViewModel.cs
@@ -1,11 +1,14 @@
 using System;
 using System.Collections.ObjectModel;
 using System.Diagnostics;
+using System.IO;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
 using CommunityToolkit.Mvvm.ComponentModel;
+using TagHierarchyManager.Common;
+using TagHierarchyManager.Exporters;
 using TagHierarchyManager.Models;
 using TagHierarchyManager.UI.Assets;
 using TagHierarchyManager.UI.Views;
@@ -104,6 +107,25 @@ public partial class MainWindowViewModel : ViewModelBase
         }
     }
 
+    private static IExporter PickExporterFromFileExt(string path)
+    {
+        string fileExt = Path.GetExtension(path);
+
+        // ReSharper disable once ConvertIfStatementToReturnStatement
+        if (fileExt == FileTypes.MusicBeeTagHierarchyTemplate.FileExtension) return new MusicBeeTagHierarchyExporter();
+
+        throw new NotSupportedException($"File extension '{fileExt}' is not supported.");
+    }
+    
+    public async Task ExportAsync(string path)
+    {
+        IExporter exporter = PickExporterFromFileExt(path);
+        this.StatusBlockText = "Exporting...";
+        string exportContent = exporter.ExportDatabase(this.Database);
+        await File.WriteAllTextAsync(path, exportContent);
+        this.StatusBlockText = "Export complete.";
+    }
+
     private void TagDatabase_TagAdded(object? sender, Tag _) => this.OnPropertyChanged(nameof(TotalTags));
     private void TagDatabase_TagDeleted(object? sender, (int id, string name) _) => this.OnPropertyChanged(nameof(TotalTags));
 
diff --git a/UI/Views/MainWindow.axaml b/UI/Views/MainWindow.axaml
index 9f1a1c0..addc3fd 100644
--- a/UI/Views/MainWindow.axaml
+++ b/UI/Views/MainWindow.axaml
@@ -12,9 +12,9 @@
     <!--
     TODO:
     - Import
-    - Export
     - Database settings
     - Search
+    - Error
     -->
     <Window.Styles>
         <!-- Target buttons with the 'delete-button' class -->
@@ -30,7 +30,7 @@
                 <Separator/>
                 <MenuItem Name="MenuItemOpen" Header="{x:Static assets:Resources.MenuItemOpen}" Click="MenuItemOpen_Click"/>
                 <Separator/>
-                <MenuItem Header="{x:Static assets:Resources.MenuItemExport}"/>
+                <MenuItem Header="{x:Static assets:Resources.MenuItemExport}" Click="MenuItemExport_Click"/>
                 <MenuItem Header="{x:Static assets:Resources.MenuItemQuit}" Click="MenuItemQuit_Click"/>
             </MenuItem>
             <MenuItem Header="{x:Static assets:Resources.MenuDatabase}">
diff --git a/UI/Views/MainWindow.axaml.cs b/UI/Views/MainWindow.axaml.cs
index 873fb24..b080d27 100644
--- a/UI/Views/MainWindow.axaml.cs
+++ b/UI/Views/MainWindow.axaml.cs
@@ -22,6 +22,11 @@ public partial class MainWindow : Window
         Patterns = ["*.thdb"]
     };
     
+    private static FilePickerFileType MusicBeeTagHierarchy { get; } = new("MusicBee tag hierarchy template")
+    {
+        Patterns = ["*.txt"]
+    };
+    
     public void OpenAboutWindow(object? sender, RoutedEventArgs e) => new AboutWindow().ShowDialog(this);
     public void MenuItemQuit_Click(object? sender, RoutedEventArgs e) => this.Close();
     
@@ -49,13 +54,14 @@ public partial class MainWindow : Window
     
     public async void MenuItemNew_Click(object? sender, RoutedEventArgs e)
     {
+        if (this.ViewModel.Database is null) return;
         try
         {
             var file = await this.StorageProvider.SaveFilePickerAsync(
                 new FilePickerSaveOptions
                 {
                     Title = "Create a new tag database...",
-                    FileTypeChoices = [TagDatabaseFileType]
+                    FileTypeChoices = [MusicBeeTagHierarchy]
                 });
             if (file == null) return;
             var path = file.TryGetLocalPath();
@@ -66,6 +72,26 @@ public partial class MainWindow : Window
             throw; // TODO handle exception
         }
     }
+    
+    public async void MenuItemExport_Click(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            var file = await this.StorageProvider.SaveFilePickerAsync(
+                new FilePickerSaveOptions
+                {
+                    Title = "Export tag database...",
+                    FileTypeChoices = [MusicBeeTagHierarchy]
+                });
+            if (file == null) return;
+            var path = file.TryGetLocalPath();
+            await this.ViewModel.ExportAsync(path);
+        }
+        catch (Exception ex)
+        {
+            throw; // TODO handle exception
+        }
+    }
 
     public async void ButtonSave_Click(object? sender, RoutedEventArgs e)
     {
-- 
2.51.2