seperated cli & some work for options

ModpackUpdater.Apps.Client.Gui/AppUpdater.cs

@@ -0,0 +1,82 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using Pilz.Extensions;
+using System.Reflection;
+
+namespace ModpackUpdater.Apps.Client.Gui;
+
+public class AppUpdater(string updateUrl)
+{
+    private class UpdateInfo
+    {
+        [JsonConverter(typeof(VersionConverter))]
+        public Version Version { get; set; }
+        public string DownloadUrl { get; set; }
+    }
+
+    private readonly HttpClient httpClient = new();
+    private UpdateInfo info;
+
+    public async Task<bool> Check()
+    {
+        var hasUpdate = false;
+
+        try
+        {
+            var appVersion = Assembly.GetExecutingAssembly().GetAppVersion().Version;
+            var result = await httpClient.GetStringAsync(updateUrl);
+            info = JsonConvert.DeserializeObject<UpdateInfo>(result);
+
+            if (info is not null && info.Version > appVersion)
+                hasUpdate = true;
+        }
+        catch
+        {
+        }
+
+        return hasUpdate;
+    }
+
+    public async Task Install()
+    {
+        var client = new HttpClient();
+        var tempFileName = Path.GetTempFileName();
+        var appFileName = Environment.ProcessPath;
+        var oldFileName = appFileName + ".old";
+
+        // Delete old file
+        try
+        {
+            File.Delete(oldFileName);
+        }
+        catch
+        {
+        }
+
+        // Download the new file
+        using (var tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite))
+        {
+            Stream? downloadStream = null;
+            try
+            {
+                var url = info?.DownloadUrl;
+                downloadStream = await client.GetStreamAsync(url);
+                await downloadStream.CopyToAsync(tempFileStream);
+            }
+            catch
+            {
+            }
+            finally
+            {
+                downloadStream?.Dispose();
+            }
+        }
+
+        // Replace current application file with new file
+        if (!string.IsNullOrWhiteSpace(appFileName))
+        {
+            File.Move(appFileName, oldFileName, true);
+            File.Move(tempFileName, appFileName);
+        }
+    }
+}