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

namespace Events.FilesAPI.Features.RegistrationsExcel;

[ApiController]
[Route("Events")]
public class DownloadRegistrationsExcelController : ControllerBase
{
  private const string XlsxContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

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

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

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