From 540baa40d0d32d87fbba0ad351ff534fd43f2749 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 7 Mar 2020 23:58:21 +0800
Subject: ...

---
 .../Resources/Services/TimelineService.Designer.cs |  9 ++++++++
 Timeline/Resources/Services/TimelineService.resx   |  3 +++
 Timeline/Services/TimelineService.cs               | 24 +++++++++++++++++++++-
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/Timeline/Resources/Services/TimelineService.Designer.cs b/Timeline/Resources/Services/TimelineService.Designer.cs
index 3ee5959f..f4d41fb8 100644
--- a/Timeline/Resources/Services/TimelineService.Designer.cs
+++ b/Timeline/Resources/Services/TimelineService.Designer.cs
@@ -69,6 +69,15 @@ namespace Timeline.Resources.Services {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Unknown post content type &quot;{0}&quot; is saved in database..
+        /// </summary>
+        internal static string ExceptionDatabaseUnknownContentType {
+            get {
+                return ResourceManager.GetString("ExceptionDatabaseUnknownContentType", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to The owner username of personal timeline is of bad format..
         /// </summary>
diff --git a/Timeline/Resources/Services/TimelineService.resx b/Timeline/Resources/Services/TimelineService.resx
index e0d76c9a..7df55fdf 100644
--- a/Timeline/Resources/Services/TimelineService.resx
+++ b/Timeline/Resources/Services/TimelineService.resx
@@ -120,6 +120,9 @@
   <data name="ExceptionChangeMemberUsernameBadFormat" xml:space="preserve">
     <value>The number {0} username is invalid.</value>
   </data>
+  <data name="ExceptionDatabaseUnknownContentType" xml:space="preserve">
+    <value>Unknown post content type "{0}" is saved in database.</value>
+  </data>
   <data name="ExceptionFindTimelineUsernameBadFormat" xml:space="preserve">
     <value>The owner username of personal timeline is of bad format.</value>
   </data>
diff --git a/Timeline/Services/TimelineService.cs b/Timeline/Services/TimelineService.cs
index edd0a0ab..ff2532ea 100644
--- a/Timeline/Services/TimelineService.cs
+++ b/Timeline/Services/TimelineService.cs
@@ -432,10 +432,20 @@ namespace Timeline.Services
                 if (entity.Content != null) // otherwise it is deleted
                 {
                     var author = Mapper.Map<UserInfo>(await UserService.GetUserById(entity.AuthorId));
+
+                    var type = entity.ContentType;
+
+                    ITimelinePostContent content = type switch
+                    {
+                        TimelinePostContentTypes.Text => new TextTimelinePostContent(entity.Content),
+                        TimelinePostContentTypes.Image => new ImageTimelinePostContent(entity.Content),
+                        _ => throw new DatabaseCorruptedException(string.Format(CultureInfo.InvariantCulture, ExceptionDatabaseUnknownContentType, type))
+                    };
+
                     posts.Add(new TimelinePostInfo
                     {
                         Id = entity.LocalId,
-                        Content = entity.Content,
+                        Content = content,
                         Author = author,
                         Time = entity.Time,
                         LastUpdated = entity.LastUpdated
@@ -544,10 +554,22 @@ namespace Timeline.Services
             if (post == null)
                 throw new TimelinePostNotExistException(id);
 
+            string? dataTag = null;
+
+            if (post.ContentType == TimelinePostContentTypes.Image)
+            {
+                dataTag = post.Content;
+            }
+
             post.Content = null;
             post.LastUpdated = Clock.GetCurrentTime();
 
             await Database.SaveChangesAsync();
+
+            if (dataTag != null)
+            {
+                await DataManager.FreeEntry(dataTag);
+            }
         }
 
         public async Task ChangeProperty(string name, TimelinePatchRequest newProperties)
-- 
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