Tweak.x

#include <UIKit/UIKit.h>

@interface UIContextMenuConfiguration (Private)
@property (nonatomic, copy) UIContextMenuActionProvider actionProvider;
@end

@interface CKConversation : NSObject
-(NSString *)displayName;
-(void)setDisplayName:(NSString *)arg1;
-(BOOL)isGroupConversation;
@end

@interface CKConversationListCollectionViewController : UICollectionViewController
-(CKConversation*)conversationAtIndexPath:(NSIndexPath*)path;
@end

%hook CKConversationListCollectionViewController

-(UIContextMenuConfiguration*)collectionView:(UICollectionView*)view contextMenuConfigurationForItemAtIndexPath:(NSIndexPath *)indexPath point:(CGPoint)point {
	UIContextMenuConfiguration* config = %orig();

	CKConversation* conversation = [self conversationAtIndexPath:indexPath];
	
	if ([conversation isGroupConversation]) {
		UIContextMenuActionProvider originalBlock = config.actionProvider;

		config.actionProvider = ^UIMenu*(NSArray<UIMenuElement*>* actions) { 
			UIMenu* actionMenu = originalBlock(actions);
			NSMutableArray* children = [NSMutableArray arrayWithArray:actionMenu.children];

			UIAction* renameAction = [UIAction
				actionWithTitle:@"Change Group Name"
				image:nil
				identifier:nil
				handler:^(UIAction* action) {
					UIAlertController* alertController = [UIAlertController
						alertControllerWithTitle:@"New Group Name"
						message:@"Leave blank to remove the name"
						preferredStyle:UIAlertControllerStyleAlert
					];
					
					[alertController addTextFieldWithConfigurationHandler:nil];
					alertController.textFields[0].text = [conversation displayName];

					UIAlertAction* cancel = [UIAlertAction
						actionWithTitle:@"Cancel"
						style:UIAlertActionStyleCancel
						handler:nil
					];
					
					UIAlertAction* ok = [UIAlertAction
						actionWithTitle:@"OK"
						style:UIAlertActionStyleDefault
						handler:^(UIAlertAction* alertAction){
							UITextField* textField = alertController.textFields[0];
							[conversation setDisplayName:textField.text];
							[self.collectionView reloadData];
						}
					];

					[alertController addAction:cancel];
					[alertController addAction:ok];
					alertController.preferredAction = ok;

					[self presentViewController:alertController animated:YES completion:nil];
				}
			];

			[children addObjectsFromArray:@[renameAction]];
			return [actionMenu menuByReplacingChildren:children];
		};
	}

	return config;
}

%end