using System.Globalization;
using Events.FilesAPI.Infrastructure.Files;
using Events.FilesAPI.Infrastructure.Options;
using Microsoft.Extensions.Options;

namespace Events.FilesAPI.Features.Certificates.Download;

public sealed class CertificateFileLocator(
  IHostEnvironment hostEnvironment,
  IOptions<GeneratedFilesOptions> generatedFilesOptions)
{
  public GeneratedFileReference? TryGet(int eventId, int personId)
  {
    string rootPath = Path.IsPathRooted(generatedFilesOptions.Value.OutputPath)
      ? generatedFilesOptions.Value.OutputPath
      : Path.GetFullPath(Path.Combine(hostEnvironment.ContentRootPath, generatedFilesOptions.Value.OutputPath));

    string certificatePath = Path.Combine(
      rootPath,
      eventId.ToString(CultureInfo.InvariantCulture),
      $"{eventId}-{personId}.pdf");

    if (!File.Exists(certificatePath))
      return null;

    return new GeneratedFileReference
    {
      FileName = Path.GetFileName(certificatePath),
      PhysicalPath = certificatePath
    };
  }
}