feat: update default comment sorter (#3149)

#### What type of PR is this?

/kind feature
/kind improvement

#### What this PR does / why we need it:

Update comments default sorter for console

#### Which issue(s) this PR fixes:

Fixes #3138 

#### Special notes for your reviewer:

#### Does this PR introduce a user-facing change?

```release-note
修改评论列表默认排序规则：依据最后回复时间及评论创建时间进行排序
```

src/main/java/run/halo/app/content/comment/CommentSorter.java

@@ -3,6 +3,7 @@ package run.halo.app.content.comment;
 import java.time.Instant;
 import java.util.Comparator;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.function.Function;
 import org.springframework.util.comparator.Comparators;
 import run.halo.app.core.extension.content.Comment;
@@ -65,9 +66,13 @@ public enum CommentSorter {
     }
 
     static Comparator<Comment> defaultCommentComparator() {
-        Function<Comment, Instant> lastReplyTime =
-            comment -> comment.getStatusOrDefault().getLastReplyTime();
-        return Comparator.comparing(lastReplyTime, Comparators.nullsLow())
+        Function<Comment, Instant> comparatorFunc =
+            comment -> {
+                Instant lastReplyTime = comment.getStatusOrDefault().getLastReplyTime();
+                return Optional.ofNullable(
+                    lastReplyTime).orElse(comment.getMetadata().getCreationTimestamp());
+            };
+        return Comparator.comparing(comparatorFunc, Comparators.nullsLow())
             .thenComparing(name);
     }
 }

src/test/java/run/halo/app/content/comment/CommentSorterTest.java

@@ -3,6 +3,7 @@ package run.halo.app.content.comment;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
 import org.junit.jupiter.api.Test;
@@ -99,6 +100,23 @@ class CommentSorterTest {
         assertThat(commentNames).isEqualTo(List.of("B", "A", "C"));
     }
 
+    @Test
+    void sortByDefaultDesc() {
+        Comparator<Comment> defaultComparator = CommentSorter.defaultCommentComparator().reversed();
+        List<String> commentNames = comments().stream()
+            .sorted(defaultComparator)
+            .map(comment -> comment.getMetadata().getName())
+            .toList();
+        assertThat(commentNames).isEqualTo(List.of("B", "A", "C"));
+
+
+        List<String> commentList = commentsIncludeNoReply().stream()
+            .sorted(defaultComparator)
+            .map(comment -> comment.getMetadata().getName())
+            .toList();
+        assertThat(commentList).isEqualTo(List.of("D", "E", "B", "A", "C"));
+    }
+
     List<Comment> comments() {
         final Instant now = Instant.now();
         Comment commentA = new Comment();
@@ -136,4 +154,33 @@ class CommentSorterTest {
 
         return List.of(commentA, commentB, commentC);
     }
+
+    List<Comment> commentsIncludeNoReply() {
+
+        final Instant now = Instant.now();
+        Comment commentD = new Comment();
+        commentD.setMetadata(new Metadata());
+        commentD.getMetadata().setName("D");
+
+        commentD.getMetadata().setCreationTimestamp(now.plusSeconds(50));
+
+        commentD.setSpec(new Comment.CommentSpec());
+        commentD.setStatus(new Comment.CommentStatus());
+
+        Comment commentE = new Comment();
+        commentE.setMetadata(new Metadata());
+        commentE.getMetadata().setName("E");
+
+        commentE.getMetadata().setCreationTimestamp(now.plusSeconds(20));
+
+        commentE.setSpec(new Comment.CommentSpec());
+        commentE.setStatus(new Comment.CommentStatus());
+
+        List<Comment> comments = new ArrayList<>(comments());
+        comments.add(commentD);
+        comments.add(commentE);
+
+        return comments;
+
+    }
 }