2 files changed, 32 insertions, 1 deletions
diff --git a/BackEnd/Timeline/Services/Api/ITimelineBookmarkService1.cs b/BackEnd/Timeline/Services/Api/ITimelineBookmarkService1.cs
index f9ee4c15..0339e94a 100644
--- a/BackEnd/Timeline/Services/Api/ITimelineBookmarkService1.cs
+++ b/BackEnd/Timeline/Services/Api/ITimelineBookmarkService1.cs
@@ -10,6 +10,8 @@ namespace Timeline.Services.Api
 
         Task<TimelineBookmark> GetBookmarkAsync(long userId, long timelineId);
 
+        Task<TimelineBookmark> GetBookmarkAtAsync(long userId, int position);
+
         Task<TimelineBookmark> AddBookmarkAsync(long userId, long timelineId, int? position = null);
 
         Task DeleteBookmarkAsync(long userId, long timelineId);
diff --git a/BackEnd/Timeline/Services/Api/TimelineBookmarkService1.cs b/BackEnd/Timeline/Services/Api/TimelineBookmarkService1.cs
index f047a12d..4b52d61c 100644
--- a/BackEnd/Timeline/Services/Api/TimelineBookmarkService1.cs
+++ b/BackEnd/Timeline/Services/Api/TimelineBookmarkService1.cs
@@ -29,6 +29,15 @@ namespace Timeline.Services.Api
             var user = await _userService.GetUserAsync(userId);
             var timeline = await _timelineService.GetTimelineAsync(timelineId);
 
+            if (await _databaseContext.BookmarkTimelines.AnyAsync(b => b.UserId == userId && b.TimelineId == timelineId))
+            {
+                throw new EntityAlreadyExistException(EntityTypes.BookmarkTimeline, new Dictionary<string, object>
+                {
+                    {"user-id", userId },
+                    {"timeline-id", timelineId }
+                });
+            }
+
             var count = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId).CountAsync();
 
             if (position.HasValue)
@@ -92,7 +101,8 @@ namespace Timeline.Services.Api
         public async Task<TimelineBookmark> GetBookmarkAsync(long userId, long timelineId)
         {
             var user = await _userService.GetUserAsync(userId);
-            var timeline = await _timelineService.GetTimelineAsync(timelineId); var entity = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId && b.TimelineId == timelineId).SingleOrDefaultAsync();
+            var timeline = await _timelineService.GetTimelineAsync(timelineId);
+            var entity = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId && b.TimelineId == timelineId).SingleOrDefaultAsync();
 
             if (entity is null)
             {
@@ -106,6 +116,25 @@ namespace Timeline.Services.Api
             return new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, (int)entity.Rank);
         }
 
+        public async Task<TimelineBookmark> GetBookmarkAtAsync(long userId, int position)
+        {
+            var user = await _userService.GetUserAsync(userId);
+            var entity = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId && b.Rank == position).SingleOrDefaultAsync();
+
+            if (entity is null)
+            {
+                throw new EntityNotExistException(EntityTypes.BookmarkTimeline, new Dictionary<string, object>
+                {
+                    { "user-id", userId },
+                    { "position", position }
+                });
+            }
+
+            var timeline = await _timelineService.GetTimelineAsync(entity.TimelineId);
+
+            return new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, (int)entity.Rank);
+        }
+
         public async Task<Page<TimelineBookmark>> GetBookmarksAsync(long userId, int page, int pageSize)
         {
             if (page <= 0) throw new ArgumentOutOfRangeException(nameof(page));