feat: introduce AfkStateChangeEvent for AFK state tracking

- Added `AfkStateChangeEvent` to track player AFK state changes.
- Updated player implementation to use `AtomicBoolean` for thread-safe AFK state management.
- Integrated `AfkStateChangeEvent` posting in AFK state update logic across client and standalone modules.

Author: twisti-dev

surf-cloud-api/surf-cloud-api-common/src/main/kotlin/dev/slne/surf/cloud/api/common/event/player/afk/AfkStateChangeEvent.kt

@@ -0,0 +1,7 @@
+package dev.slne.surf.cloud.api.common.event.player.afk
+
+import dev.slne.surf.cloud.api.common.event.player.CloudPlayerEvent
+import dev.slne.surf.cloud.api.common.player.CloudPlayer
+
+class AfkStateChangeEvent(val isAfk: Boolean, source: Any, player: CloudPlayer) :
+    CloudPlayerEvent(source, player)

surf-cloud-core/surf-cloud-core-client/src/main/kotlin/dev/slne/surf/cloud/core/client/netty/network/ClientRunningPacketListenerImpl.kt

@@ -3,6 +3,7 @@ package dev.slne.surf.cloud.core.client.netty.network
 import com.google.common.flogger.StackSize
 import dev.slne.surf.cloud.api.common.event.offlineplayer.punishment.CloudPlayerPunishEvent
 import dev.slne.surf.cloud.api.common.event.offlineplayer.punishment.CloudPlayerPunishmentUpdatedEvent
+import dev.slne.surf.cloud.api.common.event.player.afk.AfkStateChangeEvent
 import dev.slne.surf.cloud.api.common.netty.network.ConnectionProtocol
 import dev.slne.surf.cloud.api.common.netty.network.protocol.respond
 import dev.slne.surf.cloud.api.common.netty.packet.NettyPacket
@@ -274,6 +275,7 @@ class ClientRunningPacketListenerImpl(
         playerManagerImpl.getPlayer(packet.uuid)?.let { player ->
             require(player is ClientCloudPlayerImpl<*>) { "Player $player is not a client player" }
             player.afk = packet.isAfk
+            AfkStateChangeEvent(packet.isAfk, this, player).postAndForget()
         }
     }
 

surf-cloud-standalone/src/main/kotlin/dev/slne/surf/cloud/standalone/player/StandaloneCloudPlayerImpl.kt

@@ -1,5 +1,6 @@
 package dev.slne.surf.cloud.standalone.player
 
+import dev.slne.surf.cloud.api.common.event.player.afk.AfkStateChangeEvent
 import dev.slne.surf.cloud.api.common.netty.network.protocol.await
 import dev.slne.surf.cloud.api.common.netty.network.protocol.awaitOrThrow
 import dev.slne.surf.cloud.api.common.netty.packet.NettyPacket
@@ -51,6 +52,7 @@ import java.time.ZonedDateTime
 import java.time.temporal.ChronoUnit
 import java.util.*
 import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
 
@@ -88,8 +90,7 @@ class StandaloneCloudPlayerImpl(uuid: UUID, name: String, val ip: Inet4Address)
     private val ppdcMutex = Mutex()
     private var firstSeenCache: ZonedDateTime? = null
 
-    var afk = false
-        private set
+    private val afk = AtomicBoolean(false)
 
     var sessionStartTime: ZonedDateTime = ZonedDateTime.now()
 
@@ -105,7 +106,7 @@ class StandaloneCloudPlayerImpl(uuid: UUID, name: String, val ip: Inet4Address)
     }
 
     override fun isAfk(): Boolean {
-        return afk
+        return afk.get()
     }
 
     override suspend fun currentSessionDuration(): Duration {
@@ -114,15 +115,15 @@ class StandaloneCloudPlayerImpl(uuid: UUID, name: String, val ip: Inet4Address)
     }
 
     fun updateAfkStatus(newValue: Boolean) {
-        if (newValue == afk) return
-        afk = newValue
+        if (!afk.compareAndSet(!newValue, newValue)) return
 
-        nettyServer.connection.broadcast(UpdateAFKStatePacket(uuid, afk))
+        nettyServer.connection.broadcast(UpdateAFKStatePacket(uuid, newValue))
+        AfkStateChangeEvent(newValue, this, this).postAndForget()
 
         sendText {
             appendPrefix()
             info("Du bist nun ")
-            if (afk) {
+            if (newValue) {
                 info("AFK und erhältst keine weiteren Paychecks.")
             } else {
                 info("nicht mehr AFK.")