DiunaBI/src/Backend/DiunaBI.Infrastructure/Services/GoogleSheetsHelper.cs

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($"[GoogleSheetsHelper] Original JSON length: {json.Length}");
        Console.WriteLine($"[GoogleSheetsHelper] First 200 chars: {json.Substring(0, Math.Min(200, json.Length))}");

        // Replace literal \n with actual newlines
        json = json.Replace("\\n", "\n");

        Console.WriteLine($"[GoogleSheetsHelper] After replacement, first 200 chars: {json.Substring(0, Math.Min(200, json.Length))}");

        try
        {
            return GoogleCredential.FromJson(json).CreateScoped(Scopes);
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[GoogleSheetsHelper] ERROR parsing JSON: {ex.Message}");
            Console.WriteLine($"[GoogleSheetsHelper] JSON being parsed: {json}");
            throw;
        }
#endif
    }
}