after refactor cleanup

DiunaBI.Infrastructure/Services/GoogleSheetsHelper.cs

@@ -0,0 +1,48 @@
+using Google.Apis.Auth.OAuth2;
+using Google.Apis.Services;
+using Google.Apis.Sheets.v4;
+
+namespace DiunaBI.Infrastructure.Services;
+
+public class GoogleSheetsHelper
+{
+    public SheetsService? Service { get; private set; }
+    private const string ApplicationName = "Diuna";
+    private static readonly string[] Scopes = [SheetsService.Scope.Spreadsheets];
+    public GoogleSheetsHelper()
+    {
+        InitializeService();
+    }
+    private void InitializeService()
+    {
+        var credential = GetCredentialsFromFile();
+        Service = new SheetsService(new BaseClientService.Initializer
+        {
+            HttpClientInitializer = credential,
+            ApplicationName = ApplicationName
+        });
+    }
+    private static GoogleCredential GetCredentialsFromFile()
+    {
+#if DEBUG
+        using var stream = new FileStream("client_secrets.Development.json", FileMode.Open, FileAccess.Read);
+        return GoogleCredential.FromStream(stream).CreateScoped(Scopes);
+#else
+        var json = Environment.GetEnvironmentVariable("GOOGLE_SERVICE_ACCOUNT_JSON");
+        if (string.IsNullOrWhiteSpace(json))
+            throw new InvalidOperationException("GOOGLE_SERVICE_ACCOUNT_JSON environment variable is not set.");
+
+        Console.WriteLine($"[GoogleSheetsHelper] Loading credentials from environment variable (length: {json.Length})");
+
+        try
+        {
+            return GoogleCredential.FromJson(json).CreateScoped(Scopes);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"[GoogleSheetsHelper] ERROR: Failed to parse credentials - {ex.Message}");
+            throw new InvalidOperationException("Failed to parse Google service account credentials. Ensure GOOGLE_SERVICE_ACCOUNT_JSON is properly formatted.", ex);
+        }
+#endif
+    }
+}