using Microsoft.AspNetCore.Mvc;
using Events.FilesAPI.Features.Certificates.Download;
using MediatR;

namespace Events.FilesAPI.Features.Certificates;

[ApiController]
[Route("Registrations")]
public class DownloadCertificateController : ControllerBase
{
  private const string PdfContentType = "application/pdf";

  [HttpGet("{id}/Certificate")]
  [ProducesResponseType(typeof(PhysicalFileResult), StatusCodes.Status200OK)]
  [ProducesResponseType(StatusCodes.Status404NotFound)]
  public async Task<IActionResult> DownloadCertificate(
    int id,
    [FromServices] IMediator mediator,
    CancellationToken cancellationToken)
  {
    DownloadCertificateResult result = await mediator.Send(new DownloadCertificateQuery(id), cancellationToken);
    if (!result.RegistrationFound)
      return Problem(statusCode: StatusCodes.Status404NotFound, detail: $"Invalid id = {id}");

    if (result.File == null)
      return Problem(statusCode: StatusCodes.Status404NotFound, detail: "Certificate could not be generated.");

    return PhysicalFile(result.File.PhysicalPath, PdfContentType, result.File.FileName);
  }
}