SpigotCore_Main/src/de/steamwar/sql/Elo.java

@@ -23,7 +23,11 @@ public class Elo {
     private Elo(){}
 
     public static int getElo(int userId, String gameMode){
-        return Provider.impl.getElo(userId, gameMode);
+        return Provider.impl.getCurrentElo(userId, gameMode);
+    }
+
+    public static int getElo(int season, int userId, String gameMode){
+        return Provider.impl.getElo(season, userId, gameMode);
     }
 
     public static void setElo(int userId, String gameMode, int elo){

SpigotCore_Main/src/de/steamwar/sql/Provider.java

@@ -39,7 +39,26 @@ public interface Provider {
     List<CheckedSchematic> getLastDeclinedOfNode(int node);
     List<CheckedSchematic> getLastDelined(int schemOwner);
 
-    int getElo(int userId, String gameMode);
+    int getCurrentSeason(); // returns -1 is in standalone mode
+    default String convertSeasonNumberToString(int season) {
+        if (season == -1) return "";
+        int yearSeason = season % 3;
+        int year = (season - yearSeason) / 3;
+        return String.format("%d-%d", year, yearSeason);
+    }
+    default int convertSeasonStringToNumber(String season) {
+        if (season.isEmpty()) return -1;
+        String[] split = season.split("-");
+        try {
+            return Integer.parseInt(split[0]) * 3 + Integer.parseInt(split[1]);
+        } catch (NumberFormatException e) {
+            return -1;
+        }
+    }
+    default int getCurrentElo(int userId, String gameMode) {
+        return getElo(getCurrentSeason(), userId, gameMode);
+    }
+    int getElo(int season, int userId, String gameMode);
     void setElo(int userId, String gameMode, int elo);
 
     Event getEvent(int eventID);

SpigotCore_Main/src/de/steamwar/sql/SQLProvider.java

@@ -78,20 +78,27 @@ public class SQLProvider implements Provider {
         return new CheckedSchematic(rs.getInt("NodeId"), rs.getInt("Validator"), rs.getTimestamp("StartTime"), rs.getTimestamp("EndTime"), rs.getString("DeclineReason"));
     }
 
-    private static final Statement getElo = new Statement("SELECT Elo FROM Elo WHERE UserID = ? AND GameMode = ?");
     @Override
-    public int getElo(int userId, String gameMode) {
+    public int getCurrentSeason() {
+        Calendar calendar = Calendar.getInstance();
+        int yearIndex = calendar.get(Calendar.MONTH) / 3;
+        return (calendar.get(Calendar.YEAR) * 3 + yearIndex);
+    }
+
+    private static final Statement getElo = new Statement("SELECT Elo FROM Elo WHERE UserID = ? AND GameMode = ? AND Season = ?");
+    @Override
+    public int getElo(int season, int userId, String gameMode) {
         return getElo.select(rs -> {
             if(rs.next())
                 return rs.getInt("Elo");
             return 1000;
-        }, userId, gameMode);
+        }, userId, gameMode, season);
     }
 
-    private static final Statement setElo = new Statement("INSERT INTO Elo (UserID, GameMode, Elo) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE Elo = VALUES(Elo)");
+    private static final Statement setElo = new Statement("UPDATE Elo SET Elo = ? WHERE Season = ? AND UserID = ? AND GameMode = ?");
     @Override
     public void setElo(int userId, String gameMode, int elo) {
-        setElo.update(userId, gameMode, elo);
+        setElo.update(elo, getCurrentSeason(), userId, gameMode);
     }
 
     private static final Statement getEvent = new Statement("SELECT * FROM Event WHERE EventID = ?");

SpigotCore_Main/src/de/steamwar/sql/Season.java

@@ -0,0 +1,36 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.sql;
+
+public class Season {
+    private Season() {}
+
+    public static int getSeason() {
+        return Provider.impl.getCurrentSeason();
+    }
+
+    public static String convertSeasonToString(int season){
+        return Provider.impl.convertSeasonNumberToString(season);
+    }
+
+    public static int convertSeasonToNumber(String season){
+        return Provider.impl.convertSeasonStringToNumber(season);
+    }
+}

SpigotCore_Main/src/de/steamwar/sql/StandaloneProvider.java

@@ -65,7 +65,12 @@ public class StandaloneProvider implements Provider {
     }
 
     @Override
-    public int getElo(int userId, String gameMode) {
+    public int getCurrentSeason() {
+        return -1;
+    }
+
+    @Override
+    public int getElo(int season, int userId, String gameMode) {
         return 1000;
     }