Refactor to enable separate delete logic for the initial post

view/src/main/java/se/su/dsv/scipro/forum/ForumThread.java

@@ -6,7 +6,14 @@ import se.su.dsv.scipro.forum.dataobjects.ForumPost;
 import se.su.dsv.scipro.system.User;
 
 public interface ForumThread<A> extends IClusterable {
-    List<ForumPost> getPosts(A a);
+    /**
+     * @param a the context of the thread
+     * @return the initial post of the thread
+     */
+    Optional<ForumPost> getInitialPost(A a);
+
+    List<ForumPost> getReplies(A a);
+
     ForumPost reply(A a, User poster, String content, Set<Attachment> attachments);
     String getSubject(A a);
     void setRead(User user, A a);

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ForumPostPanel.java

@@ -23,7 +23,7 @@ public class ForumPostPanel extends Border {
     public static final String ATTACHMENT = "attachment";
 
     public ForumPostPanel(String id, final IModel<ForumPost> model) {
-        super(id);
+        super(id, model);
         addToBorder(new UserLinkPanel(POSTED_BY, LambdaModel.of(model, ForumPost::getPostedBy, ForumPost::setPostedBy)));
         addToBorder(
             new WebMarkupContainer("postedBySystem") {

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ProjectForumThread.java

@@ -17,8 +17,14 @@ public class ProjectForumThread implements ForumThread<ProjectThread> {
     }
 
     @Override
-    public List<ForumPost> getPosts(final ProjectThread projectThread) {
-        return projectForumService.getPosts(projectThread);
+    public Optional<ForumPost> getInitialPost(ProjectThread projectThread) {
+        return projectForumService.getPosts(projectThread).stream().findFirst();
+    }
+
+    @Override
+    public List<ForumPost> getReplies(final ProjectThread projectThread) {
+        List<ForumPost> posts = projectForumService.getPosts(projectThread);
+        return posts.subList(1, posts.size());
     }
 
     @Override

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ViewForumThreadPanel.html

@@ -19,6 +19,7 @@
         <div wicket:id="topReplyPanel"></div>
         <!-- POST LIST-->
         <div class="d-flex flex-column-reverse">
+            <wicket:container wicket:id="initialPost"></wicket:container>
             <wicket:container wicket:id="postList">
                 <wicket:container wicket:id="post">
                     <button wicket:id="delete" class="btn btn-sm btn-outline-danger ms-auto">Delete</button>

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ViewForumThreadPanel.java

@@ -13,6 +13,7 @@ import org.apache.wicket.markup.html.list.ListView;
 import org.apache.wicket.markup.html.panel.GenericPanel;
 import org.apache.wicket.model.IModel;
 import org.apache.wicket.model.LoadableDetachableModel;
+import se.su.dsv.scipro.components.OrNullModel;
 import se.su.dsv.scipro.forum.ForumThread;
 import se.su.dsv.scipro.forum.dataobjects.ForumPost;
 import se.su.dsv.scipro.session.SciProSession;
@@ -54,6 +55,13 @@ public class ViewForumThreadPanel<A> extends GenericPanel<A> {
     }
 
     private void addPostList() {
+        wrapper.add(new ForumPostPanel("initialPost", new OrNullModel<>(getModel().map(forumThread::getInitialPost))) {
+            @Override
+            protected void onConfigure() {
+                super.onConfigure();
+                setVisible(getDefaultModelObject() != null);
+            }
+        });
         wrapper.add(
             new ListView<>(POST_LIST, new PostProvider()) {
                 @Override
@@ -122,7 +130,7 @@ public class ViewForumThreadPanel<A> extends GenericPanel<A> {
 
         @Override
         protected List<ForumPost> load() {
-            List<ForumPost> posts = forumThread.getPosts(getModelObject());
+            List<ForumPost> posts = forumThread.getReplies(getModelObject());
             posts.sort(Comparator.comparing(ForumPost::getDateCreated));
             return posts;
         }

view/src/main/java/se/su/dsv/scipro/group/GroupForumThread.java

@@ -17,8 +17,14 @@ public class GroupForumThread implements ForumThread<GroupThread> {
     }
 
     @Override
-    public List<ForumPost> getPosts(final GroupThread groupThread) {
-        return groupForumService.getPosts(groupThread);
+    public Optional<ForumPost> getInitialPost(GroupThread groupThread) {
+        return groupForumService.getPosts(groupThread).stream().findFirst();
+    }
+
+    @Override
+    public List<ForumPost> getReplies(final GroupThread groupThread) {
+        List<ForumPost> posts = groupForumService.getPosts(groupThread);
+        return posts.subList(1, posts.size());
     }
 
     @Override

view/src/main/java/se/su/dsv/scipro/reviewer/ReviewerInteractionForumThread.java

@@ -18,7 +18,12 @@ public class ReviewerInteractionForumThread implements ForumThread<Project>, ICl
     }
 
     @Override
-    public List<ForumPost> getPosts(final Project project) {
+    public Optional<ForumPost> getInitialPost(Project project) {
+        return Optional.empty();
+    }
+
+    @Override
+    public List<ForumPost> getReplies(final Project project) {
         return reviewerInteractionService.getPosts(project);
     }