Create raw handlers in plugin listener overloads

game/src/main/kotlin/org/apollo/game/plugin/kotlin/KotlinMessageHandler.kt

@@ -7,19 +7,6 @@ import org.apollo.game.plugin.PluginContext
 import org.apollo.net.message.Message
 import kotlin.reflect.KClass
 
-class KotlinMessageHandler<F : Message, T : ListenableContext>(
-    world: World,
-    private val listenable: MessageListenable<F, T>,
-    private val callback: T.() -> Unit
-) : MessageHandler<F>(world) {
-
-    override fun handle(player: Player, message: F) {
-        val context = listenable.createContext(player, message)
-        context?.callback()
-    }
-
-}
-
 /**
  * A handler for [Message]s.
  */

game/src/main/kotlin/org/apollo/game/plugin/kotlin/KotlinPluginScript.kt

@@ -20,35 +20,35 @@ abstract class KotlinPluginScript(var world: World, val context: PluginContext)
 
     private var stopListener: (World) -> Unit = { _ -> }
 
-    fun <T : Any, C : ListenableContext> on(listenable: Listenable<T, C>, callback: C.() -> Unit) {
+    fun <T : Any, C : ListenableContext, I : PredicateContext> on(
+        listenable: Listenable<T, C, I>,
+        callback: C.() -> Unit
+    ) {
+        registerListener(listenable, null, callback)
+    }
+
+    internal fun <T : Any, C : ListenableContext, I : PredicateContext> registerListener(
+        listenable: Listenable<T, C, I>,
+        predicateContext: I?,
+        callback: C.() -> Unit
+    ) {
         // Smart-casting/type-inference is completely broken in this function in intelliJ, so assign to otherwise
         // pointless `l` values for now.
 
         return when (listenable) {
             is MessageListenable -> {
                 @Suppress("UNCHECKED_CAST")
-                val l = listenable as MessageListenable<Message, C>
+                val l = listenable as MessageListenable<Message, C, I>
 
-                val handler = KotlinMessageHandler(world, l, callback)
+                val handler = l.createHandler(world, predicateContext, callback)
                 context.addMessageHandler(l.type.java, handler)
             }
-            is PlayerEventListenable -> {
-                @Suppress("UNCHECKED_CAST")
-                val l = listenable as PlayerEventListenable<PlayerEvent, C>
-
-                world.listenFor(l.type.java) { event ->
-                    val context = l.createContext(event)
-                    context?.callback()
-                }
-            }
             is EventListenable -> {
                 @Suppress("UNCHECKED_CAST")
-                val l = listenable as EventListenable<Event, C>
+                val l = listenable as EventListenable<Event, C, I>
 
-                world.listenFor(l.type.java) { event ->
-                    val context = l.createContext(event)
-                    context?.callback()
-                }
+                val handler = l.createHandler(world, predicateContext, callback)
+                world.listenFor(l.type.java, handler)
             }
         }
     }

game/src/main/kotlin/org/apollo/game/plugin/kotlin/Listenable.kt

@@ -1,32 +1,27 @@
 package org.apollo.game.plugin.kotlin
 
-import org.apollo.game.model.entity.Player
+import org.apollo.game.message.handler.MessageHandler
+import org.apollo.game.model.World
 import org.apollo.game.model.event.Event
-import org.apollo.game.model.event.PlayerEvent
+import org.apollo.game.model.event.EventListener
 import org.apollo.net.message.Message
 import kotlin.reflect.KClass
 
 /**
  * A game occurrence that can be listened to.
  */
-sealed class Listenable<T : Any, C : ListenableContext> {
+sealed class Listenable<T : Any, C : ListenableContext, P : PredicateContext> {
     abstract val type: KClass<T>
 }
 
-abstract class EventListenable<T : Event, C : ListenableContext> : Listenable<T, C>() {
-    abstract fun createContext(event: T): C?
+abstract class EventListenable<T : Event, C : ListenableContext, P : PredicateContext> : Listenable<T, C, P>() {
+
+    abstract fun createHandler(world: World, predicateContext: P?, callback: C.() -> Unit): EventListener<T>
+
 }
 
-abstract class MessageListenable<T : Message, C : ListenableContext> : Listenable<T, C>() {
-    abstract fun createContext(player: Player, message: T): C?
+abstract class MessageListenable<T : Message, C : ListenableContext, P : PredicateContext> : Listenable<T, C, P>() {
+
+    abstract fun createHandler(world: World, predicateContext: P?, callback: C.() -> Unit): MessageHandler<T>
+
 }
-
-abstract class PlayerEventListenable<T : PlayerEvent, C : ListenableContext> : EventListenable<T, C>() {
-
-    abstract fun createContext(player: Player, event: T): C?
-
-    final override fun createContext(event: T): C? {
-        return createContext(event.player, event)
-    }
-
-}

game/src/main/kotlin/org/apollo/game/plugin/kotlin/ListenableContext.kt

@@ -12,4 +12,6 @@ interface ListenableContext
  */
 interface PlayerContext : ListenableContext {
     val player: Player
-}
+}
+
+interface PredicateContext

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/ButtonClick.kt

@@ -1,10 +1,13 @@
 package org.apollo.game.plugin.kotlin.message
 
+import org.apollo.game.message.handler.MessageHandler
 import org.apollo.game.message.impl.ButtonMessage
+import org.apollo.game.model.World
 import org.apollo.game.model.entity.Player
 import org.apollo.game.plugin.kotlin.KotlinPluginScript
 import org.apollo.game.plugin.kotlin.MessageListenable
 import org.apollo.game.plugin.kotlin.PlayerContext
+import org.apollo.game.plugin.kotlin.PredicateContext
 
 /**
  * Registers a listener for [ButtonMessage]s that occur on the given [button] id.
@@ -20,21 +23,34 @@ fun KotlinPluginScript.on(
     button: Int,
     callback: ButtonClick.() -> Unit
 ) {
-    on(listenable) {
-        if (this.button == button) {
-            callback()
-        }
-    }
+    registerListener(listenable, ButtonPredicateContext(button), callback)
 }
 
 class ButtonClick(override val player: Player, val button: Int) : PlayerContext {
 
-    companion object : MessageListenable<ButtonMessage, ButtonClick>() {
-        override val type = ButtonMessage::class
+    companion object : MessageListenable<ButtonMessage, ButtonClick, ButtonPredicateContext>() {
 
-        override fun createContext(player: Player, message: ButtonMessage): ButtonClick {
-            return ButtonClick(player, message.widgetId)
+        override val type = ButtonMessage::class
+        
+        override fun createHandler(
+            world: World,
+            predicateContext: ButtonPredicateContext?,
+            callback: ButtonClick.() -> Unit
+        ): MessageHandler<ButtonMessage> {
+            return object : MessageHandler<ButtonMessage>(world) {
+
+                override fun handle(player: Player, message: ButtonMessage) {
+                    if (predicateContext == null || predicateContext.button == message.widgetId) {
+                        val context = ButtonClick(player, message.widgetId)
+                        context.callback()
+                    }
+                }
+
+            }
         }
+
     }
 
-}
+}
+
+class ButtonPredicateContext(val button: Int) : PredicateContext

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/action/ActionContext.kt

@@ -3,6 +3,7 @@ package org.apollo.game.plugin.kotlin.message.action
 import org.apollo.game.plugin.kotlin.KotlinPluginScript
 import org.apollo.game.plugin.kotlin.MessageListenable
 import org.apollo.game.plugin.kotlin.PlayerContext
+import org.apollo.game.plugin.kotlin.PredicateContext
 import org.apollo.net.message.Message
 
 /**
@@ -14,18 +15,16 @@ import org.apollo.net.message.Message
  * }
  * ```
  */
-inline fun <T : ActionContext, reified F : Message> KotlinPluginScript.on(
-    listenable: MessageListenable<F, T>,
+fun <T : ActionContext, F : Message> KotlinPluginScript.on(
+    listenable: MessageListenable<F, T, ActionPredicateContext>,
     option: String,
-    crossinline callback: T.() -> Unit
+    callback: T.() -> Unit
 ) {
-    on(listenable) {
-        if (this.option.equals(option, ignoreCase = true)) {
-            callback()
-        }
-    }
+    registerListener(listenable, ActionPredicateContext(option), callback)
 }
 
 interface ActionContext : PlayerContext {
     val option: String
 }
+
+open class ActionPredicateContext(open val option: String) : PredicateContext

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/action/obj/ObjectAction.kt

@@ -1,12 +1,60 @@
 package org.apollo.game.plugin.kotlin.message.action.obj
 
 import org.apollo.cache.def.ObjectDefinition
+import org.apollo.game.message.handler.MessageHandler
 import org.apollo.game.message.impl.ObjectActionMessage
+import org.apollo.game.model.World
 import org.apollo.game.model.entity.EntityType
 import org.apollo.game.model.entity.Player
 import org.apollo.game.model.entity.obj.GameObject
+import org.apollo.game.plugin.kotlin.KotlinPluginScript
+import org.apollo.game.plugin.kotlin.MessageListenable
 import org.apollo.game.plugin.kotlin.message.action.ActionContext
 
+/**
+ * Registers a listener for [ObjectActionMessage]s that occur on any of the given [InteractiveObject]s using the
+ * given [option] (case-insensitive).
+ *
+ * ```
+ * on(ObjectAction, option = "Open", objects = DOORS.toList()) {
+ *     player.sendMessage("You open the door.")
+ * }
+ * ```
+ */
+fun <T : InteractiveObject> KotlinPluginScript.on(
+    listenable: ObjectAction.Companion,
+    option: String,
+    objects: List<T>,
+    callback: ObjectAction<T>.() -> Unit
+) {
+    @Suppress("UNCHECKED_CAST") (callback as ObjectAction<*>.() -> Unit)
+    registerListener(listenable, ObjectActionPredicateContext(option, objects), callback)
+}
+
+/**
+ * Registers a listener for [ObjectActionMessage]s that occur on any of the given [InteractiveObject]s using the
+ * given [option] (case-insensitive).
+ *
+ * ```
+ * on(ObjectAction, option = "Open", objects = DOORS.toList()) {
+ *     player.sendMessage("You open the door.")
+ * }
+ * ```
+ */
+fun KotlinPluginScript.on(
+    listenable: ObjectAction.Companion,
+    option: String,
+    callback: ObjectAction<*>.() -> Unit
+) {
+    registerListener(listenable, ObjectActionPredicateContext(option, emptyList()), callback)
+}
+
+fun KotlinPluginScript.x() {
+    on(ObjectAction, "walk") {
+
+    }
+}
+
 /**
  * An interaction between a [Player] and an [interactive] [GameObject].
  */
@@ -17,44 +65,44 @@ class ObjectAction<T : InteractiveObject?>( // TODO split into two classes, one
     val interactive: T
 ) : ActionContext {
 
-    companion object : ObjectActionListenable() {
+    companion object : MessageListenable<ObjectActionMessage, ObjectAction<*>, ObjectActionPredicateContext<*>>() {
 
         override val type = ObjectActionMessage::class
 
-        override fun createContext(player: Player, message: ObjectActionMessage): ObjectAction<*>? {
-            return create<InteractiveObject>(player, message, objects = null)
-        }
+        override fun createHandler(
+            world: World,
+            predicateContext: ObjectActionPredicateContext<*>?,
+            callback: ObjectAction<*>.() -> Unit
+        ): MessageHandler<ObjectActionMessage> {
+            return object : MessageHandler<ObjectActionMessage>(world) {
 
-        override fun <T : InteractiveObject> createContext(
-            player: Player,
-            other: ObjectActionMessage,
-            objects: List<T>
-        ): ObjectAction<T>? {
-            @Suppress("UNCHECKED_CAST")
-            return create(player, other, objects) as ObjectAction<T>
-        }
+                override fun handle(player: Player, message: ObjectActionMessage) {
+                    val def = ObjectDefinition.lookup(message.id)
+                    val option = def.menuActions[message.option]
 
-        private fun <T : InteractiveObject> create(
-            player: Player,
-            other: ObjectActionMessage,
-            objects: List<T>?
-        ): ObjectAction<*>? {
-            val def = ObjectDefinition.lookup(other.id)
-            val selectedAction = def.menuActions[other.option]
+                    val target = world.regionRepository
+                        .fromPosition(message.position)
+                        .getEntities<GameObject>(message.position, EntityType.DYNAMIC_OBJECT, EntityType.STATIC_OBJECT)
+                        .find { it.definition == def }
+                        ?: return // Could happen if object was despawned this tick, before calling this handle function
 
-            val obj = player.world.regionRepository
-                .fromPosition(other.position)
-                .getEntities<GameObject>(other.position, EntityType.DYNAMIC_OBJECT, EntityType.STATIC_OBJECT)
-                .find { it.definition == def }
-                ?: return null
+                    val context = when { // Evaluation-order matters here.
+                        predicateContext == null -> ObjectAction<InteractiveObject?>(player, option, target, null)
+                        !predicateContext.option.equals(option, ignoreCase = true) -> return
+                        predicateContext.objects.isEmpty() -> ObjectAction(player, option, target, null)
+                        predicateContext.objects.any { it.instanceOf(target) } -> {
+                            val interactive = predicateContext.objects.find { it.instanceOf(target) } ?: return
+                            ObjectAction(player, option, target, interactive)
+                        }
+                        else -> return
+                    }
+
+                    context.callback()
+                }
 
-            if (objects == null) {
-                return ObjectAction(player, selectedAction, obj, null)
-            } else {
-                val interactive = objects.find { it.instanceOf(obj) } ?: return null
-                return ObjectAction(player, selectedAction, obj, interactive)
             }
         }
+
     }
 
 }

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/action/obj/ObjectActionListenable.kt

@@ -1,17 +0,0 @@
-package org.apollo.game.plugin.kotlin.message.action.obj
-
-import org.apollo.game.message.impl.ObjectActionMessage
-import org.apollo.game.model.entity.Player
-import org.apollo.game.plugin.kotlin.MessageListenable
-
-abstract class ObjectActionListenable : MessageListenable<ObjectActionMessage, ObjectAction<*>>() {
-
-    override val type = ObjectActionMessage::class
-
-    abstract fun <T : InteractiveObject> createContext(
-        player: Player,
-        other: ObjectActionMessage,
-        objects: List<T>
-    ): ObjectAction<T>?
-
-}

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/action/obj/ObjectActionMessageHandler.kt

@@ -1,62 +0,0 @@
-package org.apollo.game.plugin.kotlin.message.action.obj
-
-import org.apollo.cache.def.ObjectDefinition
-import org.apollo.game.message.handler.MessageHandler
-import org.apollo.game.message.impl.ObjectActionMessage
-import org.apollo.game.model.World
-import org.apollo.game.model.entity.EntityType
-import org.apollo.game.model.entity.Player
-import org.apollo.game.model.entity.obj.GameObject
-import org.apollo.game.plugin.kotlin.KotlinPluginScript
-
-/**
- * Registers a listener for [ObjectActionMessage]s that occur on any of the given [InteractiveObject]s using the
- * given [option] (case-insensitive).
- *
- * ```
- * on(ObjectAction, option = "Open", objects = DOORS.toList()) {
- *     player.sendMessage("You open the door.")
- * }
- * ```
- */
-fun <T : InteractiveObject> KotlinPluginScript.on(
-    listenable: ObjectActionListenable,
-    option: String,
-    objects: List<T>,
-    callback: ObjectAction<T>.() -> Unit
-) {
-    if (objects.isEmpty()) {
-        on(listenable) {
-            @Suppress("UNCHECKED_CAST") (callback as ObjectAction<*>.() -> Unit)
-            callback(this)
-        }
-    } else {
-        val handler = ObjectActionMessageHandler(world, listenable, objects, option, callback)
-        context.addMessageHandler(listenable.type.java, handler)
-    }
-}
-
-class ObjectActionMessageHandler<T : InteractiveObject>(
-    world: World,
-    private val listenable: ObjectActionListenable,
-    private val objects: List<T>,
-    private val option: String,
-    private val callback: ObjectAction<T>.() -> Unit
-) : MessageHandler<ObjectActionMessage>(world) {
-
-    override fun handle(player: Player, message: ObjectActionMessage) {
-        val def = ObjectDefinition.lookup(message.id)
-        val selectedAction = def.menuActions[message.option]
-
-        val obj = player.world.regionRepository
-            .fromPosition(message.position)
-            .getEntities<GameObject>(message.position, EntityType.DYNAMIC_OBJECT, EntityType.STATIC_OBJECT)
-            .first { it.definition == def }
-
-        if (option.equals(selectedAction, ignoreCase = true) && objects.any { it.instanceOf(obj) }) {
-            val context = listenable.createContext(player, message, objects)
-            context?.callback()
-        }
-    }
-
-}

game/src/main/kotlin/org/apollo/game/plugin/kotlin/message/action/obj/ObjectActionPredicateContext.kt

@@ -0,0 +1,8 @@
+package org.apollo.game.plugin.kotlin.message.action.obj
+
+import org.apollo.game.plugin.kotlin.message.action.ActionPredicateContext
+
+data class ObjectActionPredicateContext<T : InteractiveObject>(
+    override val option: String,
+    val objects: List<T>
+) : ActionPredicateContext(option)