ProtectedPlayerManager adjustments and AFK timer.

- No longer adding a player that might not exist to then instantly remove them if they don't.
- Updated method calls to match new ones in ProtectedPlayer.
- Updated packet names to new ones.
- Grace period timer no longer cancels the timer but itself instead.
- Created new method for starting the afk timer for a player, starting a new afk timer whenever a player becomes active.

src/main/java/dev/micle/loginprotection/data/ProtectedPlayerManager.java

@@ -2,7 +2,8 @@ package dev.micle.loginprotection.data;
 
 import dev.micle.loginprotection.LoginProtection;
 import dev.micle.loginprotection.network.NetworkManager;
-import dev.micle.loginprotection.network.ServerPlayerStatePacket;
+import dev.micle.loginprotection.network.server.PlayerStatePacket;
+import dev.micle.loginprotection.network.server.RequestLastInputTickPacket;
 import dev.micle.loginprotection.setup.Config;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.effect.MobEffectInstance;
@@ -36,14 +37,12 @@ public class ProtectedPlayerManager {
         if (getPlayer(playerUUID) != null) {
             return;
         }
-        protectedPlayers.add(new ProtectedPlayer(playerUUID, ProtectedPlayer.State.JOINING));
         try {
-            NetworkManager.getChannel().sendTo(new ServerPlayerStatePacket(ProtectedPlayer.State.JOINING),
+            protectedPlayers.add(new ProtectedPlayer(playerUUID, ProtectedPlayer.State.JOINING));
+            NetworkManager.getChannel().sendTo(new PlayerStatePacket(ProtectedPlayer.State.JOINING),
                     LoginProtection.getProxy().getServer().getPlayerList().getPlayer(playerUUID).connection.getConnection(),
                     NetworkDirection.PLAY_TO_CLIENT);
-        } catch (NullPointerException e) {
-            removePlayer(playerUUID);
-        }
+        } catch (NullPointerException ignored) {}
     }
 
     /**
@@ -70,7 +69,7 @@ public class ProtectedPlayerManager {
             return;
         }
 
-        player.getGracePeriodTimer().cancel();
+        player.getTimer().cancel();
         protectedPlayers.remove(player);
     }
 
@@ -93,49 +92,79 @@ public class ProtectedPlayerManager {
             if (currentState.equals(ProtectedPlayer.State.JOINING) || currentState.equals(ProtectedPlayer.State.AFK)) {
                 // JOINING, AFK -> ACTIVE
                 protectedPlayer.setState(ProtectedPlayer.State.ACTIVE);
-                protectedPlayer.setLastInputTick(player.tickCount);
                 if (Config.Server.POST_GRACE_ENABLED.get()) {
                     startGracePeriod(playerUUID);
                 } else {
                     applyPostEffects(playerUUID);
                 }
+                startAfkTimer(playerUUID, Config.Server.AFK_TIME_THRESHOLD.get() * 1000);
             } else {
                 // ACTIVE -> AFK
                 protectedPlayer.setState(ProtectedPlayer.State.AFK);
             }
 
             // Send state packet to player
-            NetworkManager.getChannel().sendTo(new ServerPlayerStatePacket(protectedPlayer.getState()),
+            NetworkManager.getChannel().sendTo(new PlayerStatePacket(protectedPlayer.getState()),
                     player.connection.getConnection(),
                     NetworkDirection.PLAY_TO_CLIENT);
         }
     }
 
+    public static void startAfkTimer(UUID playerUUID, long delay) {
+        ProtectedPlayer player = getPlayer(playerUUID);
+        if (player == null) {
+            return;
+        }
+
+        // Create scheduled task
+        // Todo: Make task period change according to the last input tick of a player
+        player.setAfkTimerTask(new TimerTask() {
+            @Override
+            public void run() {
+                if (!player.getState().equals(ProtectedPlayer.State.ACTIVE)) {
+                    this.cancel();
+                    return;
+                }
+
+                try {
+                    // Send request for list input tick packet to player
+                    NetworkManager.getChannel().sendTo(new RequestLastInputTickPacket(),
+                            LoginProtection.getProxy().getServer().getPlayerList().getPlayer(playerUUID).connection.getConnection(),
+                            NetworkDirection.PLAY_TO_CLIENT);
+                } catch (NullPointerException e) {
+                    removePlayer(playerUUID);
+                }
+            }
+        }, delay);
+    }
+
     /**
      * Starts the grace period counter for a player.
      * @param playerUUID UUID of player to start the grace period for.
      */
     private static void startGracePeriod(UUID playerUUID) {
         ProtectedPlayer player = getPlayer(playerUUID);
-        if (player == null) return;
+        if (player == null) {
+            return;
+        }
 
         // Set grace period length
         player.setGracePeriod(Config.Server.POST_GRACE_DURATION.get());
 
         // Create scheduled task
-        player.getGracePeriodTimer().schedule(new TimerTask() {
+        player.setGracePeriodTimerTask(new TimerTask() {
             @Override
             public void run() {
                 player.setGracePeriod(player.getGracePeriodTimeRemaining() - 1);
                 if (player.getGracePeriodTimeRemaining() == 0) {
                     applyPostEffects(playerUUID);
-                    player.getGracePeriodTimer().cancel();
+                    this.cancel();
                     if (!Config.Server.AFK_PROTECTION_ENABLED.get()) {
                         ProtectedPlayerManager.removePlayer(playerUUID);
                     }
                 }
             }
-        }, 1000, 1000);
+        });
     }
 
     /**