Reading / writing user id based on os username

Juliet/src/Engine/user.cpp

@@ -8,6 +8,11 @@
 #include <Core/Thread/ThreadContext.h>
 #include <Engine/Engine.h>
 
+namespace
+{
+    UserID local_user_id = 0U;
+}
+
 void initialize_user_system()
 {
     // Project needs a user.ini file with all users
@@ -29,26 +34,61 @@ void initialize_user_system()
         IOStream* stream = IOFromFile(temp.Arena, user_system_path.FullPath, ConstString("w+"));
         Archive   ar     = { .arena = temp.Arena, .loading = false, .stream = stream };
 
-        uint8 id = 1;
+        UserID id = 1;
         serialize(ar, username, crc32(username), id);
+        local_user_id = id;
 
         IOClose(stream);
     }
     else
     {
-        ByteBuffer user_file = LoadFile(temp.Arena, user_system_path.FullPath);
-
-        ParsedArchive parsed_archive = tokenize_archive(temp.Arena, user_file);
-
-        Archive ar = { .arena = temp.Arena, .loading = true, .base = parsed_archive };
-
-        if (ArchivePropertyNode* prop = find_property(&parsed_archive, crc32(username)))
+        NonNullPtr<IOStream> stream    = IOFromFile(temp.Arena, user_system_path.FullPath, ConstString("r+"));
+        size_t               file_size = IOSize(stream);
+        if (file_size == 0)
         {
-            // User exists lets read
-            uint8 user_id = 0;
-            read_prop(ar, prop->value, user_id);
-            Assert(user_id != 0);
+            Archive ar = { .arena = temp.Arena, .loading = false, .stream = stream };
+            UserID  id = 1;
+            serialize(ar, username, crc32(username), id);
+            local_user_id = id;
         }
+        else
+        {
+            Byte* content = (Byte*)ArenaPushSize(temp.Arena, file_size, 8, true JULIET_DEBUG_PARAM("File Content"));
+            IORead(stream, content, file_size);
+
+            ByteBuffer user_file = { content, file_size };
+
+            ParsedArchive parsed_archive = tokenize_archive(temp.Arena, user_file);
+
+            if (ArchivePropertyNode* prop = find_property(&parsed_archive, crc32(username)))
+            {
+                Archive ar = { .arena = temp.Arena, .loading = true, .base = parsed_archive };
+
+                // User exists lets read
+                read_prop(ar, prop->value, local_user_id);
+                Assert(local_user_id != 0);
+            }
+            else
+            {
+                // User do not exist lets create it
+                Archive ar = { .arena = temp.Arena, .loading = false, .stream = stream };
+
+                // Read all users and take biggest id + 1
+                uint8 biggest_id = 0;
+                auto* nodes      = parsed_archive.nodes;
+                for (index_t idx = 0; idx < parsed_archive.property_count; ++idx)
+                {
+                    uint8 id = 0;
+                    read_prop(ar, nodes[idx].value, id);
+                    biggest_id = Max<uint8>(biggest_id, id + 1);
+                }
+
+                serialize(ar, username, crc32(username), biggest_id);
+                local_user_id = biggest_id;
+            }
+        }
+
+        IOClose(stream);
     }
 
     scratch_end(temp);
@@ -58,5 +98,5 @@ void shutdown_user_system() {}
 
 uint8 get_local_user_id()
 {
-    return 0u;
+    return local_user_id;
 }