From c0f4a8e212a47f2cff1dc7161dfbea62913fa483 Mon Sep 17 00:00:00 2001
From: delvh <dev.lh@web.de>
Date: Thu, 16 Jul 2020 17:47:59 +0200
Subject: [PATCH] Warned user on group creation if he already has a Group with
 that name

---
 .../ui/controller/GroupCreationScene.java     | 46 +++++++++++++++++--
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java b/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
index e6ca29a..88f66d7 100644
--- a/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
+++ b/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
@@ -16,6 +16,8 @@ import envoy.client.ui.ClearableTextField;
 import envoy.client.ui.SceneContext;
 import envoy.client.ui.listcell.ContactControl;
 import envoy.client.ui.listcell.ListCellFactory;
+import envoy.data.Contact;
+import envoy.data.Group;
 import envoy.data.User;
 import envoy.event.EventBus;
 import envoy.event.GroupCreation;
@@ -50,6 +52,8 @@ public class GroupCreationScene {
 
 	private SceneContext sceneContext;
 
+	private LocalDB localDB;
+
 	private static final EventBus eventBus = EventBus.getInstance();
 
 	@FXML
@@ -66,7 +70,8 @@ public class GroupCreationScene {
 	 * @since Envoy Client v0.1-beta
 	 */
 	public void initializeData(SceneContext sceneContext, LocalDB localDB) {
-		this.sceneContext = sceneContext;
+		this.sceneContext	= sceneContext;
+		this.localDB		= localDB;
 		Platform.runLater(() -> userList.getItems()
 			.addAll(localDB.getChats()
 				.stream()
@@ -109,14 +114,47 @@ public class GroupCreationScene {
 		if (!Bounds.isValidContactName(name)) {
 			new Alert(AlertType.ERROR, "The entered group name is not valid (" + Bounds.CONTACT_NAME_PATTERN + ")").showAndWait();
 			groupNameField.getTextField().clear();
+		} else if (groupNameAlreadyPresent(name)) {
+			final var alert = new Alert(AlertType.WARNING, "You already have a group  with that name.", ButtonType.OK, ButtonType.CANCEL);
+			alert.setTitle("Create Group?");
+			alert.setHeaderText("Proceed?");
+			alert.showAndWait().filter(btn -> btn == ButtonType.OK).ifPresent(btn -> createGroup(name));
 		} else {
-			eventBus.dispatch(new SendEvent(
-					new GroupCreation(name, userList.getSelectionModel().getSelectedItems().stream().map(User::getID).collect(Collectors.toSet()))));
 			new Alert(AlertType.INFORMATION, String.format("Group '%s' successfully created.", name)).showAndWait();
-			sceneContext.pop();
+			createGroup(name);
 		}
 	}
 
+	/**
+	 * Creates a new group with the given name and all selected members.<br>
+	 * Additionally pops the scene automatically.
+	 *
+	 * @param name the chosen group name
+	 * @since Envoy Client v0.1-beta
+	 */
+	private void createGroup(String name) {
+		eventBus.dispatch(new SendEvent(
+				new GroupCreation(name, userList.getSelectionModel().getSelectedItems().stream().map(User::getID).collect(Collectors.toSet()))));
+		sceneContext.pop();
+	}
+
+	/**
+	 * Returns true if the proposed group name is already present in the users
+	 * {@code LocalDB}.
+	 *
+	 * @param newName the chosen group name
+	 * @return true if this name is already present
+	 * @since Envoy Client v0.1-beta
+	 */
+	public boolean groupNameAlreadyPresent(String newName) {
+		return localDB.getChats()
+			.stream()
+			.map(Chat::getRecipient)
+			.filter(Group.class::isInstance)
+			.map(Contact::getName)
+			.anyMatch(groupName -> groupName.equals(newName));
+	}
+
 	@FXML
 	private void backButtonClicked() { sceneContext.pop(); }
 }