Update from Git Manager GUI

src/main/java/de/velocityfall/manager/GameManager.java

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+package de.velocityfall.manager;
+
+import de.velocityfall.VelocityFall;
+import de.velocityfall.utils.StatsHandler;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.Sound;
+import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitRunnable;
+
+public class GameManager {
+
+    public static void startArenaCountdown(String arenaName) {
+        VelocityFall plugin = VelocityFall.getInstance();
+        if (plugin.getGameStartedMap().getOrDefault(arenaName, false)) return;
+
+        new BukkitRunnable() {
+            int timeLeft = plugin.getConfig().getInt("BeforeGameCD", 15);
+
+            @Override
+            public void run() {
+                int playerCount = (int) plugin.getPlayerArenaMap().values().stream().filter(arenaName::equals).count();
+
+                if (playerCount < 1) {
+                    cancel();
+                    return;
+                }
+
+                if (timeLeft <= 5 && timeLeft > 0) {
+                    broadcast(arenaName, "§aSpiel startet in §e" + timeLeft + "...");
+                }
+
+                if (timeLeft <= 0) {
+                    plugin.getGameStartedMap().put(arenaName, true);
+                    plugin.getArenaPlayersCountMap().put(arenaName, playerCount);
+
+                    plugin.getSignManager().updateSign(arenaName);
+
+                    broadcast(arenaName, "§6§lDAS SPIEL BEGINNT!");
+
+                    Location spawn = plugin.getArenaManager().getArenaConfig().getLocation("Arenas." + arenaName + ".Spawn");
+
+                    plugin.getPlayerArenaMap().forEach((p, a) -> {
+                        if (arenaName.equals(a)) {
+                            if (spawn != null) p.teleport(spawn);
+                            p.setGameMode(GameMode.ADVENTURE);
+                            p.setAllowFlight(false);
+                            p.playSound(p.getLocation(), Sound.ENTITY_GENERIC_EXPLODE, 1f, 1f);
+                        }
+                    });
+                    cancel();
+                }
+                timeLeft--;
+            }
+        }.runTaskTimer(plugin, 0L, 20L);
+    }
+
+    public static void startCountdown(String arenaName) {
+        startArenaCountdown(arenaName);
+    }
+
+    public static void checkForWinner(String arenaName) {
+        VelocityFall plugin = VelocityFall.getInstance();
+        var countMap = plugin.getArenaPlayersCountMap();
+        int remaining = countMap.getOrDefault(arenaName, 0);
+
+        if (remaining != 1) return;
+
+        var arenaPlayers = VelocityFall.getArenaPlayers(arenaName);
+        if (arenaPlayers.isEmpty()) return;
+
+        Player winner = arenaPlayers.get(0);
+
+        winner.sendMessage(VelocityFall.prefix + ChatColor.translateAlternateColorCodes('&',
+                plugin.getMessages().getMessagesConfig().getString("WinMessage", "&aDu hast gewonnen!")));
+
+        StatsHandler.addWin(winner.getUniqueId().toString());
+
+        plugin.ingameArenas.remove(arenaName);
+        plugin.ingamePlayers.remove(winner);
+        plugin.getPlayerArenaMap().remove(winner);
+        countMap.remove(arenaName);
+        plugin.getGameStartedMap().remove(arenaName);
+        winner.setScoreboard(Bukkit.getScoreboardManager().getNewScoreboard());
+
+        resetArena(arenaName);
+
+        plugin.getSignManager().updateSign(arenaName);
+    }
+
+    public static void resetArena(String arenaName) {
+        VelocityFall plugin = VelocityFall.getInstance();
+
+        plugin.getArenaBlocksMap().forEach((block, matName) -> block.setType(Material.valueOf(matName)));
+        plugin.getArenaBlocksMap().clear();
+
+        plugin.getGameStartedMap().put(arenaName, false);
+        plugin.getArenaPlayersCountMap().remove(arenaName);
+
+        Location lobby = plugin.getArenaManager().getArenaConfig().getLocation("Arenas." + arenaName + ".Lobby");
+
+        plugin.getPlayerArenaMap().entrySet().removeIf(e -> {
+            if (arenaName.equals(e.getValue())) {
+                Player p = e.getKey();
+                p.setGameMode(GameMode.SURVIVAL);
+                p.getInventory().clear();
+                if (lobby != null) p.teleport(lobby);
+                plugin.ingamePlayers.remove(p);
+                return true;
+            }
+            return false;
+        });
+
+        plugin.getSignManager().updateSign(arenaName);
+    }
+
+    private static void broadcast(String arena, String msg) {
+        VelocityFall plugin = VelocityFall.getInstance();
+        plugin.getPlayerArenaMap().forEach((player, a) -> {
+            if (arena.equals(a)) player.sendMessage(VelocityFall.prefix + msg);
+        });
+    }
+}