Documents: restructure Documents/ directory

Elwig/Helpers/Printing/Html.cs

@@ -0,0 +1,35 @@
+using RazorLight;
+using System;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Printing {
+    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(App.DataPath + "resources")
+                .UseMemoryCachingProvider()
+                .Build();
+
+            await e.CompileTemplateAsync("Document");
+            await e.CompileTemplateAsync("BusinessDocument");
+            await e.CompileTemplateAsync("BusinessLetter");
+            await e.CompileTemplateAsync("DeliveryNote");
+            await e.CompileTemplateAsync("CreditNote");
+            await e.CompileTemplateAsync("DeliveryJournal");
+            await e.CompileTemplateAsync("Letterhead");
+            await e.CompileTemplateAsync("DeliveryConfirmation");
+
+            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);
+        }
+    }
+}