fix: dont have offline delegates be block producers

dont have offline delegates be block producers.

Usually this is not an issue since the top 50 are online, and offline delegates move to the bottom of the list, but if their is only 50 or a lot are offline, this will matter.

src/functions/block_verifiers_functions/block_verifiers_update_functions/block_verifiers_update_functions.c

@@ -884,6 +884,13 @@ int calculate_main_nodes_roles(void)
         goto start;
       }
 
+      // check if the delegate is offline and if so skip it
+      if (check_current_online_status(current_block_verifiers_list.block_verifiers_public_address[count2]) == 0)
+      {
+        goto start;
+      }
+
+
       if (main_nodes_count == 0)
       {
         // calculate the block_producer
@@ -1306,3 +1313,46 @@ int get_delegates_online_status(void)
   #undef MESSAGE
   #undef GET_DELEGATES_ONLINE_STATUS_ERROR
 }
+
+
+
+/*
+-----------------------------------------------------------------------------------------------------------
+Name: check_current_online_status
+Description: Checks the current online status for selecting the block producer
+Parameters:
+  DELEGATES_PUBLIC_ADDRESS - The delegates public address
+Return: 0 if an error has occured or the delegate is offline, 1 if the delegate is online
+-----------------------------------------------------------------------------------------------------------
+*/
+
+int check_current_online_status(const char* DELEGATES_PUBLIC_ADDRESS)
+{
+  // Variables
+  char data[SMALL_BUFFER_SIZE];
+  char data2[SMALL_BUFFER_SIZE];
+
+  // define macros
+  #define DATABASE_COLLECTION "delegates"
+
+  memset(data,0,sizeof(data));
+  memset(data2,0,sizeof(data2));
+
+  memcpy(data2,"{\"public_address\":\"",19);
+  memcpy(data2+19,DELEGATES_PUBLIC_ADDRESS,XCASH_WALLET_LENGTH);
+  memcpy(data2+117,"\"}",2);
+
+  if (read_document_field_from_collection(database_name,DATABASE_COLLECTION,data2,"online_status",data) == 0 || strncmp(data,"offline",BUFFER_SIZE) == 0)
+  {
+    return 0;
+  }
+
+  if (strncmp(data,"online",BUFFER_SIZE) == 0)
+  {
+    return 1;
+  }
+
+  return 0;
+
+  #undef DATABASE_COLLECTION
+}

src/functions/block_verifiers_functions/block_verifiers_update_functions/block_verifiers_update_functions.h

@@ -15,4 +15,5 @@ int add_round_statistics(void);
 int calculate_main_nodes_roles(void);
 void check_for_updates(void);
 int get_delegates_online_status(void);
-#endif
+int check_current_online_status(const char* DELEGATES_PUBLIC_ADDRESS);
+#endif