feat(ui): add collection sorting menu and sort method selection

app/src/main/java/ru/project/model/SortMethod.java

@@ -0,0 +1,6 @@
+package ru.project.model;
+
+public enum SortMethod {
+  NORMAL,
+  PARITY
+}

app/src/main/java/ru/project/ui/menu/MainMenu.java

@@ -14,11 +14,13 @@ public class MainMenu extends BaseModalWindow {
   private final ActionListBox menu;
 
   private final BaseModalWindow createCollectionMenu;
+  private final BaseModalWindow sortCollectionMenu;
 
   public MainMenu(WindowBasedTextGUI gui, AppState state) {
     super("Главное меню", gui);
 
     this.createCollectionMenu = new CreateCollectionMenu(gui, state);
+    this.sortCollectionMenu = new SortCollectionMenu(gui, state);
 
     menu = new ActionListBox();
 
@@ -57,8 +59,7 @@ public class MainMenu extends BaseModalWindow {
   }
 
   private void sortCollection() {
-    // TODO
+    sortCollectionMenu.showModal();
-    MessageWindow.showModal(gui, "Не реализовано.");
   }
 
   private void searchCollection() {

app/src/main/java/ru/project/ui/menu/SortCollectionMenu.java

@@ -0,0 +1,101 @@
+package ru.project.ui.menu;
+
+import com.googlecode.lanterna.gui2.Button;
+import com.googlecode.lanterna.gui2.Label;
+import com.googlecode.lanterna.gui2.LinearLayout;
+import com.googlecode.lanterna.gui2.Panel;
+import com.googlecode.lanterna.gui2.WindowBasedTextGUI;
+import ru.project.model.AppState;
+import ru.project.model.SortMethod;
+import ru.project.ui.base.BaseModalWindow;
+import ru.project.ui.window.MessageWindow;
+import ru.project.ui.window.SortMethodSelectionWindow;
+
+public class SortCollectionMenu extends BaseModalWindow {
+
+  private final AppState state;
+
+  private final Label sortMethodLabel;
+  private final SortMethodSelectionWindow sortMethodSelectionWindow;
+
+  private SortMethod selectedSortMethod;
+
+  public SortCollectionMenu(WindowBasedTextGUI gui, AppState state) {
+
+    super("Меню сортировки текущей коллекции", gui);
+
+    this.state = state;
+    this.selectedSortMethod = SortMethod.NORMAL;
+
+    Panel panel = new Panel();
+    panel.setLayoutManager(new LinearLayout());
+
+    this.sortMethodLabel = new Label("Способ сортировки: " + getSortMethodName(selectedSortMethod));
+
+    this.sortMethodSelectionWindow =
+        new SortMethodSelectionWindow(
+            gui,
+            sortMethod -> {
+              selectedSortMethod = sortMethod;
+
+              sortMethodLabel.setText(
+                  "Способ сортировки: " + getSortMethodName(selectedSortMethod));
+            });
+
+    panel.addComponent(sortMethodLabel);
+
+    panel.addComponent(new Button("Выбрать способ сортировки", this::selectSortMethod));
+
+    panel.addComponent(
+        new Button("Настроить текущий способ сортировки", this::setupCurrentSortMethod));
+
+    panel.addComponent(new Button("Сортировать текущую коллекцию", this::sortCurrentCollection));
+
+    panel.addComponent(new Button("Выйти", this::close));
+
+    setComponent(panel);
+  }
+
+  private void setupCurrentSortMethod() {
+    MessageWindow.showModal(gui, "Настройка способа сортировки пока не реализована.");
+  }
+
+  private void selectSortMethod() {
+    sortMethodSelectionWindow.showModal();
+  }
+
+  private void sortCurrentCollection() {
+    if (state.getMainCollection() == null || state.getMainCollection().isEmpty()) {
+
+      MessageWindow.showModal(gui, "Текущая коллекция пуста.");
+      return;
+    }
+
+    switch (selectedSortMethod) {
+      case NORMAL:
+        sortNormally();
+        break;
+
+      case PARITY:
+        sortByParity();
+        break;
+    }
+  }
+
+  private void sortNormally() {
+    // TODO
+    MessageWindow.showModal(gui, "Обычная сортировка не реализована.");
+  }
+
+  private void sortByParity() {
+    // TODO
+    MessageWindow.showModal(gui, "Сортировка по чётности не реализована.");
+  }
+
+  private String getSortMethodName(SortMethod sortMethod) {
+    return switch (sortMethod) {
+      case NORMAL -> "Обычная сортировка";
+      case PARITY -> "Сортировка по чётности";
+    };
+  }
+}

app/src/main/java/ru/project/ui/window/SortMethodSelectionWindow.java

@@ -0,0 +1,33 @@
+package ru.project.ui.window;
+
+import com.googlecode.lanterna.gui2.ActionListBox;
+import com.googlecode.lanterna.gui2.WindowBasedTextGUI;
+import java.util.function.Consumer;
+import ru.project.model.SortMethod;
+import ru.project.ui.base.BaseModalWindow;
+
+public class SortMethodSelectionWindow extends BaseModalWindow {
+
+  private final Consumer<SortMethod> onSortMethodSelected;
+
+  public SortMethodSelectionWindow(
+      WindowBasedTextGUI gui, Consumer<SortMethod> onSortMethodSelected) {
+
+    super("Выбрать способ сортировки", gui);
+
+    this.onSortMethodSelected = onSortMethodSelected;
+
+    ActionListBox menu = new ActionListBox();
+
+    menu.addItem("Обычная сортировка", () -> selectSortMethod(SortMethod.NORMAL));
+
+    menu.addItem("Сортировка по чётности", () -> selectSortMethod(SortMethod.PARITY));
+
+    setComponent(menu);
+  }
+
+  private void selectSortMethod(SortMethod sortMethod) {
+    onSortMethodSelected.accept(sortMethod);
+    close();
+  }
+}