Descargar reporte general de vacaciones en excel.

src/main/java/com/primefactorsolutions/views/RequestsListView.java

@@ -5,19 +5,33 @@ import com.primefactorsolutions.service.EmployeeService;
 import com.primefactorsolutions.service.TeamService;
 import com.primefactorsolutions.service.TimeOffRequestService;
 import com.primefactorsolutions.service.VacationService;
+import com.vaadin.flow.component.UI;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.combobox.ComboBox;
+import com.vaadin.flow.component.dialog.Dialog;
+import com.vaadin.flow.component.html.Anchor;
+import com.vaadin.flow.component.html.Span;
 import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
+import com.vaadin.flow.server.StreamRegistration;
+import com.vaadin.flow.server.StreamResource;
 import com.vaadin.flow.spring.annotation.SpringComponent;
 import jakarta.annotation.security.PermitAll;
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.springframework.context.annotation.Scope;
 import org.vaadin.firitin.components.grid.PagingGrid;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.time.DayOfWeek;
 import java.time.LocalDate;
 import java.time.Period;
+import java.time.temporal.WeekFields;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -67,7 +81,6 @@ public class RequestsListView extends BaseView {
         hl.add(createEmployeeFilter());
         hl.add(createTeamFilter());
         hl.add(createStateFilter());
-
         getCurrentPageLayout().add(hl);
     }
 
@@ -95,8 +108,9 @@ public class RequestsListView extends BaseView {
                 Notification.show("Seleccione una solicitud.", 3000, Notification.Position.MIDDLE);
             }
         });
+        Button downloadButton = new Button("Descargar reporte", event -> downloadReport());
         Button closeButton = new Button("Salir", event -> navigateToMainView());
-        return new HorizontalLayout(viewButton, closeButton);
+        return new HorizontalLayout(viewButton, downloadButton, closeButton);
     }
 
     private void refreshGeneralRequestGrid(final Employee employee,
@@ -419,4 +433,52 @@ public class RequestsListView extends BaseView {
     private void navigateToTimeOffRequestView(final UUID idEmployee) {
         getUI().ifPresent(ui -> ui.navigate("requests/" + idEmployee.toString()));
     }
+
+    private ByteArrayInputStream generateExcelReport(List<Employee> employees) {
+        try (Workbook workbook = new XSSFWorkbook()) {
+            Sheet sheet = workbook.createSheet("Reporte Horas Trabajadas");
+            Row headerRow = sheet.createRow(0);
+
+            String[] headers = {"Nombre", "Equipo", "Estado", "Total Horas"};
+            for (int i = 0; i < headers.length; i++) {
+                Cell cell = headerRow.createCell(i);
+                cell.setCellValue(headers[i]);
+            }
+
+            int rowIndex = 1;
+            for (Employee employee : employees) {
+                Row row = sheet.createRow(rowIndex++);
+                row.createCell(0).setCellValue(getEmployeeFullName(employee));
+                row.createCell(1).setCellValue(getTeamName(employee));
+                row.createCell(2).setCellValue(getEmployeeStatus(employee));
+                row.createCell(3).setCellValue(getGeneralTotal(employee));
+            }
+
+            try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
+                workbook.write(out);
+                return new ByteArrayInputStream(out.toByteArray());
+            }
+        } catch (IOException e) {
+            throw new UncheckedIOException("Error al generar el archivo Excel", e);
+        }
+    }
+
+    private StreamResource generateGeneralVacationReport() {
+        List<Employee> employees = employeeService.findAllEmployees();
+
+        ByteArrayInputStream excelStream = generateExcelReport(employees);
+
+        return new StreamResource("reporte_general_de_vacaciones_" + LocalDate.now() + ".xlsx",
+                () -> excelStream);
+    }
+
+    private void downloadReport() {
+        StreamResource resource = generateGeneralVacationReport();
+        getUI().ifPresent(ui -> openDocumentStream(resource, ui));
+    }
+
+    private void openDocumentStream(final StreamResource resource, final UI ui) {
+        StreamRegistration registration = ui.getSession().getResourceRegistry().registerResource(resource);
+        ui.getPage().open(registration.getResourceUri().toString());
+    }
 }