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

@@ -8,6 +8,8 @@ import com.primefactorsolutions.service.VacationService;
 import com.vaadin.flow.component.ClickEvent;
 import com.vaadin.flow.component.Component;
 import com.vaadin.flow.component.ComponentEventListener;
+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.contextmenu.MenuItem;
 import com.vaadin.flow.component.icon.VaadinIcon;
@@ -17,13 +19,23 @@ import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.function.ValueProvider;
 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;
 
@@ -61,6 +73,8 @@ public class RequestsListView extends BaseView {
 
     private void initializeView() {
         requestService.updateRequestStatuses();
+        Button downloadButton = new Button("Descargar reporte", event -> downloadReport());
+        getCurrentPageLayout().add(downloadButton);
         setupFilters();
         setupRequestGrid();
         getCurrentPageLayout().add(requestGrid);
@@ -71,7 +85,6 @@ public class RequestsListView extends BaseView {
         hl.add(createEmployeeFilter());
         hl.add(createTeamFilter());
         hl.add(createStateFilter());
-
         getCurrentPageLayout().add(hl);
     }
 
@@ -414,4 +427,51 @@ 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());
+    }
 }