Feature/routes export (#29)

Co-authored-by: gorbenko.pavel <gorbenko.pavel@tansu.kz>
Reviewed-on: http://git.tnsu.kz/gorbenko.pavel/tnsu-approval-route/pulls/29

backend/Tnsu.ApprovalRoute.Api/Controllers/ReportsController.cs

@@ -15,7 +15,7 @@ namespace Tnsu.ApprovalRoute.Api.Controllers;
 [ApiController]
 [Authorize(Policy = AuthPolicies.Any)]
 [Route("api/reports")]
-public sealed class ReportsController(VacancyReportService vacancies) : ControllerBase
+public sealed class ReportsController(VacancyReportService vacancies, RouteExportService routeExport) : ControllerBase
 {
     private const string XlsxContentType =
         "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
@@ -51,4 +51,27 @@ public sealed class ReportsController(VacancyReportService vacancies) : Controll
 
         return File(file, XlsxContentType);
     }
+
+    /// <summary>
+    /// Выгрузка маршрутов согласования выбранных типов заявок в xlsx (лист на тип).
+    /// POST — потому что в теле список id типов (см. RouteExportService).
+    /// </summary>
+    [HttpPost("routes")]
+    [Produces(XlsxContentType)]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    public async Task<IActionResult> Routes([FromBody] RouteExportRequest request, CancellationToken ct = default)
+    {
+        var result = await routeExport.BuildAsync(request.RequestTypeIds, ct);
+        if (result.IsFailed)
+            return BadRequest(new { errors = result.Errors.Select(e => e.Message) });
+
+        var file = result.Value;
+
+        var disposition = new ContentDispositionHeaderValue("attachment");
+        disposition.SetHttpFileName(file.FileName);
+        Response.Headers.ContentDisposition = disposition.ToString();
+
+        return File(file.Content, XlsxContentType);
+    }
 }