From a55678e5ef8819787cd55d6e448ca16a3f211401 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Wed, 8 Mar 2023 23:25:01 +0100
Subject: [PATCH] Using Html/Pdf Initializer

---
 WGneu/App.xaml                     |  1 +
 WGneu/App.xaml.cs                  | 21 ++++++++++++++++
 WGneu/Documents/Document.cshtml.cs |  2 +-
 WGneu/Documents/Html.cs            | 31 +++++++++++++++++++++++
 WGneu/Documents/Pdf.cs             | 40 +++++++++---------------------
 WGneu/Documents/Template.cs        |  2 +-
 WGneu/Windows/MainWindow.xaml      |  4 +--
 WGneu/Windows/MainWindow.xaml.cs   |  4 ++-
 8 files changed, 72 insertions(+), 33 deletions(-)
 create mode 100644 WGneu/Documents/Html.cs

diff --git a/WGneu/App.xaml b/WGneu/App.xaml
index eb0d788..3e2bd20 100644
--- a/WGneu/App.xaml
+++ b/WGneu/App.xaml
@@ -3,6 +3,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:local="clr-namespace:WGneu"
              StartupUri="Windows\MainWindow.xaml"
+             Startup="App_Startup"
              xmlns:ui="http://schemas.modernwpf.com/2019">
     <Application.Resources>
         <!--<ResourceDictionary>
diff --git a/WGneu/App.xaml.cs b/WGneu/App.xaml.cs
index 98b8ba0..91a3ace 100644
--- a/WGneu/App.xaml.cs
+++ b/WGneu/App.xaml.cs
@@ -5,11 +5,32 @@ using System.Data;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
+using System.Windows.Controls;
 
 namespace WGneu {
     public partial class App : Application {
+
+        public static bool IsPrintingReady => Documents.Html.IsReady && Documents.Pdf.IsReady;
+
         public App() : base() {
             System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
         }
+
+        public void App_Startup(object sender, EventArgs e) {
+            Task.Run(() => Documents.Html.Init(PrintingReadyChanged));
+            Task.Run(() => Documents.Pdf.Init(PrintingReadyChanged));
+        }
+
+        private void PrintingReadyChanged() {
+            Dispatcher.BeginInvoke(App_PrintingReadyChanged, this, new EventArgs());
+        }
+
+        private void App_PrintingReadyChanged(object sender, EventArgs e) {
+            foreach (Window w in Windows) {
+                foreach (var b in Utils.FindVisualChilds<Button>(w).Where(b => "Print".Equals(b.Tag))) {
+                    b.IsEnabled = IsPrintingReady;
+                }
+            }
+        }
     }
 }
diff --git a/WGneu/Documents/Document.cshtml.cs b/WGneu/Documents/Document.cshtml.cs
index 26d19fb..80325bd 100644
--- a/WGneu/Documents/Document.cshtml.cs
+++ b/WGneu/Documents/Document.cshtml.cs
@@ -31,7 +31,7 @@ namespace WGneu.Documents {
 
         private async Task<string> Render() {
             if (this is BusinessLetter bl) {
-                return await Pdf.CompileRenderAsync("BusinessLetter.cshtml", bl);
+                return await Html.CompileRenderAsync("BusinessLetter", bl);
             }
             throw new InvalidOperationException();
         }
diff --git a/WGneu/Documents/Html.cs b/WGneu/Documents/Html.cs
new file mode 100644
index 0000000..e233994
--- /dev/null
+++ b/WGneu/Documents/Html.cs
@@ -0,0 +1,31 @@
+using RazorLight;
+using RazorLight.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WGneu.Documents {
+    public static class Html {
+        private static RazorLightEngine? Engine = null;
+        public static bool IsReady => Engine != null;
+
+        public static async Task Init(Action evtHandler) {
+            var e = new RazorLightEngineBuilder()
+                .UseFileSystemProject(@"C:\Users\Lorenz\source\repos\WGneu\WGneu\Documents")
+                .UseMemoryCachingProvider()
+                .Build();
+
+            await e.CompileTemplateAsync("BusinessLetter");
+
+            Engine = e;
+            evtHandler();
+        }
+
+        public static async Task<string> CompileRenderAsync(string key, object model) {
+            if (Engine == null) throw new InvalidOperationException("The razor engine has not been initialized yet");
+            return await Engine.CompileRenderAsync(key, model);
+        }
+    }
+}
diff --git a/WGneu/Documents/Pdf.cs b/WGneu/Documents/Pdf.cs
index 5151698..1f82a14 100644
--- a/WGneu/Documents/Pdf.cs
+++ b/WGneu/Documents/Pdf.cs
@@ -16,35 +16,19 @@ namespace WGneu.Documents {
     public static class Pdf {
 
         private static readonly string CHROMIUM = @"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe";
-        private static IBrowser? _Browser = null;
-        private static RazorLightEngine? _Engine = null;
+        private static IBrowser? Browser = null;
+        public static bool IsReady => Browser != null;
 
-        public static void Init() {
-            var b = Browser;
-            var e = Engine;
-        }
-
-        private static IBrowser Browser {
-            get {
-                _Browser ??= Puppeteer.LaunchAsync(new LaunchOptions {
-                    Headless = true,
-                    ExecutablePath = CHROMIUM,
-                }).GetAwaiter().GetResult();
-                return _Browser;
-            }
-        }
-
-        private static RazorLightEngine Engine {
-            get {
-                _Engine ??= new RazorLightEngineBuilder()
-                    .UseFileSystemProject(@"C:\Users\Lorenz\source\repos\WGneu\WGneu\Documents")
-                    .UseMemoryCachingProvider()
-                    .Build();
-                return _Engine;
-            }
+        public static async Task Init(Action evtHandler) {
+            Browser = await Puppeteer.LaunchAsync(new LaunchOptions {
+                Headless = true,
+                ExecutablePath = CHROMIUM,
+            });
+            evtHandler();
         }
 
         public static async Task Convert(string path_html, string path_pdf) {
+            if (Browser == null) throw new InvalidOperationException("The puppeteer engine has not been initialized yet");
             using var page = await Browser.NewPageAsync();
             await page.GoToAsync("file://" + path_html);
             await page.WaitForFunctionAsync("() => window.finished");
@@ -68,13 +52,13 @@ namespace WGneu.Documents {
             doc.Save(path);
         }
 
-        public static void Display(string title, string path) {
+        public static void Show(string path, string title) {
             var w = new DocumentViewerWindow(title, path);
             w.Show();
         }
 
-        public static async Task<string> CompileRenderAsync(string key, object model) {
-            return await Engine.CompileRenderAsync(key, model);
+        public static void Print(string path) {
+            // TODO print pdf
         }
     }
 }
diff --git a/WGneu/Documents/Template.cs b/WGneu/Documents/Template.cs
index f0ffb7a..e0b4a9c 100644
--- a/WGneu/Documents/Template.cs
+++ b/WGneu/Documents/Template.cs
@@ -16,7 +16,7 @@ namespace WGneu.Documents {
         public static async void Test() {
             await Pdf.Convert(ROOT + "din-5008.html", ROOT + "test.pdf");
             Pdf.UpdateMetadata(ROOT + "test.pdf", "Test Dokument", "Winzergenossenschaft für Matzen und Umgebung reg. Gen.m.b.H.");
-            Pdf.Display("Test-Dokument", ROOT + "test.pdf");
+            Pdf.Show(ROOT + "test.pdf", "Test-Dokument");
         }
 
         public static async void Generate(WgContext c) {
diff --git a/WGneu/Windows/MainWindow.xaml b/WGneu/Windows/MainWindow.xaml
index a831070..f2bcfe5 100644
--- a/WGneu/Windows/MainWindow.xaml
+++ b/WGneu/Windows/MainWindow.xaml
@@ -18,7 +18,7 @@
     <Grid>
         <ComboBox HorizontalAlignment="Left" Margin="175,149,0,0" VerticalAlignment="Top" Width="120" ItemsSource="{Binding Source={StaticResource countryViewSource}}" ItemTemplate="{StaticResource asdf}" SelectionChanged="ComboBox_SelectionChanged" IsEditable="True"/>
         <Button x:Name="Button2" Content="Mitglieder" Margin="472,182,178,0" VerticalAlignment="Top" Click="Button2_Click"/>
-        <Button x:Name="Button3" Content="Print" Margin="425,255,225,0" VerticalAlignment="Top" Click="Button3_Click"/>
-        <Button x:Name="Button4" Content="Generate" Margin="425,300,225,0" VerticalAlignment="Top" Click="Button4_Click"/>
+        <Button x:Name="Button3" Content="Print" Margin="425,255,225,0" VerticalAlignment="Top" Click="Button3_Click" Tag="Print"/>
+        <Button x:Name="Button4" Content="Generate" Margin="425,300,225,0" VerticalAlignment="Top" Click="Button4_Click" Tag="Print"/>
     </Grid>
 </Window>
diff --git a/WGneu/Windows/MainWindow.xaml.cs b/WGneu/Windows/MainWindow.xaml.cs
index f2a2195..0e02a54 100644
--- a/WGneu/Windows/MainWindow.xaml.cs
+++ b/WGneu/Windows/MainWindow.xaml.cs
@@ -22,6 +22,7 @@ namespace WGneu.Windows {
     public partial class MainWindow : Window {
         private readonly WgContext _context = new WgContext();
         private CollectionViewSource countryViewSource;
+
         public MainWindow() {
             InitializeComponent();
             countryViewSource = (CollectionViewSource)FindResource("countryViewSource");
@@ -29,8 +30,9 @@ namespace WGneu.Windows {
 
         private void Window_Loaded(object sender, RoutedEventArgs e) {
             _context.Countries.Load();
-            Documents.Pdf.Init();
             countryViewSource.Source = _context.Countries.Local.ToObservableCollection();
+            Button3.IsEnabled = App.IsPrintingReady;
+            Button4.IsEnabled = App.IsPrintingReady;
         }
 
         protected override void OnClosing(CancelEventArgs e) {