8 files changed, 47 insertions, 7 deletions

diff --git a/client/src/app/shared/video/sort-field.type.ts b/client/src/app/shared/video/sort-field.type.ts
index d1088d244..65b24d946 100644
--- a/client/src/app/shared/video/sort-field.type.ts
+++ b/client/src/app/shared/video/sort-field.type.ts
@@ -5,3 +5,6 @@ export type VideoSortField = 'name' | '-name'
                       | 'views' | '-views'
                       | 'likes' | '-likes'
                       | 'trending' | '-trending'
+
+export type CommentSortField = 'createdAt' | '-createdAt'
+                          | 'totalReplies' | '-totalReplies'
diff --git a/client/src/app/videos/+video-watch/comment/video-comment.service.ts b/client/src/app/videos/+video-watch/comment/video-comment.service.ts
index 550d42fa8..72fbf5d25 100644
--- a/client/src/app/videos/+video-watch/comment/video-comment.service.ts
+++ b/client/src/app/videos/+video-watch/comment/video-comment.service.ts
@@ -12,7 +12,7 @@ import {
 import { environment } from '../../../../environments/environment'
 import { RestExtractor, RestService } from '../../../shared/rest'
 import { ComponentPagination } from '../../../shared/rest/component-pagination.model'
-import { VideoSortField } from '../../../shared/video/sort-field.type'
+import { CommentSortField } from '../../../shared/video/sort-field.type'
 import { VideoComment } from './video-comment.model'
 
 @Injectable()
@@ -51,7 +51,7 @@ export class VideoCommentService {
   getVideoCommentThreads (parameters: {
     videoId: number | string,
     componentPagination: ComponentPagination,
-    sort: VideoSortField
+    sort: CommentSortField
   }): Observable<ResultList<VideoComment>> {
     const { videoId, componentPagination, sort } = parameters
 
diff --git a/client/src/app/videos/+video-watch/comment/video-comments.component.html b/client/src/app/videos/+video-watch/comment/video-comments.component.html
index 5fabb7dfe..e284eab0a 100644
--- a/client/src/app/videos/+video-watch/comment/video-comments.component.html
+++ b/client/src/app/videos/+video-watch/comment/video-comments.component.html
@@ -10,6 +10,16 @@
     </div>
 
     <my-feed [syndicationItems]="syndicationItems"></my-feed>
+
+    <div ngbDropdown class="d-inline-block ml-4">
+      <button class="btn btn-sm btn-outline-secondary" id="dropdownSortComments" ngbDropdownToggle i18n>
+        Sort by
+      </button>
+      <div ngbDropdownMenu aria-labelledby="dropdownSortComments">
+        <button (click)="handleSortChange('-createdAt')" ngbDropdownItem i18n>Most recent first (default)</button>
+        <button (click)="handleSortChange('-totalReplies')" ngbDropdownItem i18n>Most replies first</button>
+      </div>
+    </div>
   </div>
 
   <ng-template [ngIf]="video.commentsEnabled === true">
diff --git a/client/src/app/videos/+video-watch/comment/video-comments.component.scss b/client/src/app/videos/+video-watch/comment/video-comments.component.scss
index dde10b068..9e3682295 100644
--- a/client/src/app/videos/+video-watch/comment/video-comments.component.scss
+++ b/client/src/app/videos/+video-watch/comment/video-comments.component.scss
@@ -23,6 +23,12 @@
   margin-right: 0;
 }
 
+#dropdownSortComments {
+  font-weight: 600;
+  text-transform: uppercase;
+  border: none;
+}
+
 my-feed {
   display: inline-block;
   margin-left: 5px;
diff --git a/client/src/app/videos/+video-watch/comment/video-comments.component.ts b/client/src/app/videos/+video-watch/comment/video-comments.component.ts
index e81401553..974c61d6c 100644
--- a/client/src/app/videos/+video-watch/comment/video-comments.component.ts
+++ b/client/src/app/videos/+video-watch/comment/video-comments.component.ts
@@ -6,7 +6,7 @@ import { VideoCommentThreadTree } from '../../../../../../shared/models/videos/v
 import { AuthService } from '../../../core/auth'
 import { ComponentPagination, hasMoreItems } from '../../../shared/rest/component-pagination.model'
 import { User } from '../../../shared/users'
-import { VideoSortField } from '../../../shared/video/sort-field.type'
+import { CommentSortField } from '../../../shared/video/sort-field.type'
 import { VideoDetails } from '../../../shared/video/video-details.model'
 import { VideoComment } from './video-comment.model'
 import { VideoCommentService } from './video-comment.service'
@@ -28,7 +28,7 @@ export class VideoCommentsComponent implements OnInit, OnChanges, OnDestroy {
 
   comments: VideoComment[] = []
   highlightedThread: VideoComment
-  sort: VideoSortField = '-createdAt'
+  sort: CommentSortField = '-createdAt'
   componentPagination: ComponentPagination = {
     currentPage: 1,
     itemsPerPage: 10,
@@ -152,6 +152,13 @@ export class VideoCommentsComponent implements OnInit, OnChanges, OnDestroy {
     this.viewReplies(commentTree.comment.id)
   }
 
+  handleSortChange (sort: CommentSortField) {
+    if (this.sort === sort) return
+
+    this.sort = sort
+    this.resetVideo()
+  }
+
   handleTimestampClicked (timestamp: number) {
     this.timestampClicked.emit(timestamp)
   }
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 79fcd0edf..1b7b94d74 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -46,7 +46,7 @@ const SORTABLE_COLUMNS = {
   VIDEO_ABUSES: [ 'id', 'createdAt', 'state' ],
   VIDEO_CHANNELS: [ 'id', 'name', 'updatedAt', 'createdAt' ],
   VIDEO_IMPORTS: [ 'createdAt' ],
-  VIDEO_COMMENT_THREADS: [ 'createdAt' ],
+  VIDEO_COMMENT_THREADS: [ 'createdAt', 'totalReplies' ],
   VIDEO_RATES: [ 'createdAt' ],
   BLACKLISTS: [ 'id', 'name', 'duration', 'views', 'likes', 'dislikes', 'uuid', 'createdAt' ],
   FOLLOWERS: [ 'createdAt', 'state', 'score' ],
diff --git a/server/models/utils.ts b/server/models/utils.ts
index b53a52a05..4199cc443 100644
--- a/server/models/utils.ts
+++ b/server/models/utils.ts
@@ -22,6 +22,19 @@ function getSort (value: string, lastSort: OrderItem = [ 'id', 'ASC' ]): OrderIt
   return [ [ finalField, direction ], lastSort ]
 }
 
+function getCommentSort (value: string, lastSort: OrderItem = [ 'id', 'ASC' ]): OrderItem[] {
+  const { direction, field } = buildDirectionAndField(value)
+
+  if (field === 'totalReplies') {
+    return [
+      [ Sequelize.literal('"totalReplies"'), direction ],
+      lastSort
+    ]
+  }
+
+  return getSort(value, lastSort)
+}
+
 function getVideoSort (value: string, lastSort: OrderItem = [ 'id', 'ASC' ]): OrderItem[] {
   const { direction, field } = buildDirectionAndField(value)
 
@@ -167,6 +180,7 @@ export {
   SortType,
   buildLocalAccountIdsIn,
   getSort,
+  getCommentSort,
   getVideoSort,
   getBlacklistSort,
   createSimilarityAttribute,
diff --git a/server/models/video/video-comment.ts b/server/models/video/video-comment.ts
index 869a42afe..28f011b03 100644
--- a/server/models/video/video-comment.ts
+++ b/server/models/video/video-comment.ts
@@ -6,7 +6,7 @@ import { isActivityPubUrlValid } from '../../helpers/custom-validators/activityp
 import { CONSTRAINTS_FIELDS, WEBSERVER } from '../../initializers/constants'
 import { AccountModel } from '../account/account'
 import { ActorModel } from '../activitypub/actor'
-import { buildBlockedAccountSQL, buildLocalAccountIdsIn, getSort, throwIfNotValid } from '../utils'
+import { buildBlockedAccountSQL, buildLocalAccountIdsIn, getCommentSort, throwIfNotValid } from '../utils'
 import { VideoModel } from './video'
 import { VideoChannelModel } from './video-channel'
 import { getServerActor } from '../../helpers/utils'
@@ -259,7 +259,7 @@ export class VideoCommentModel extends Model<VideoCommentModel> {
     const query = {
       offset: start,
       limit: count,
-      order: getSort(sort),
+      order: getCommentSort(sort),
       where: {
         videoId,
         inReplyToCommentId: null,