migrate to kotlin (#39)

* migrate to kotlin

* update workflow to use jdk 25

* Update src/main/kotlin/dev/robothanzo/werewolf/config/WebSocketConfig.kt

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* refactor: streamline collections usage and enhance WebSocket session management

* refactor: optimize mutable collections and improve string interpolation across services

* fix compile issues

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: RobotHanzo

.github/workflows/build.yml

@@ -11,11 +11,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v3
         with:
           distribution: adopt
-          java-version: 21
+          java-version: 25
           cache: gradle
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew

.idea/kotlinc.xml

@@ -2,6 +2,8 @@ plugins {
     java
     id("org.springframework.boot") version "4.0.2"
     id("io.spring.dependency-management") version "1.1.7"
+    kotlin("jvm") version "2.3.0"
+    kotlin("plugin.spring") version "2.3.0"
 }
 
 group = "dev.robothanzo.werewolf"
@@ -20,11 +22,15 @@ dependencies {
     implementation("org.springframework.boot:spring-boot-starter-websocket")
     implementation("org.springframework.boot:spring-boot-starter-security")
     implementation("org.mongodb:mongodb-spring-session:4.0.0-rc1")
-    
+
+    // Kotlin
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+
     // Discord
     implementation("net.dv8tion:JDA:6.3.0")
     implementation("club.minnced:discord-webhooks:0.8.4")
-    implementation("com.github.RobotHanzo:JDAInteractions:v0.1.4")
+    implementation("com.github.RobotHanzo:JDAInteractions:0.2.0")
     implementation("com.github.Mokulu:discord-oauth2-api:1.0.4")
 
     // JDA Audio supplements
@@ -54,6 +60,13 @@ tasks {
         options.encoding = Charsets.UTF_8.name()
     }
 
+    compileKotlin {
+        compilerOptions {
+            freeCompilerArgs.addAll("-Xjsr305=strict")
+            jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_25)
+        }
+    }
+
     bootJar {
         mainClass.set("dev.robothanzo.werewolf.WerewolfApplication")
     }

.idea/modules.xml

@@ -0,0 +1,26 @@
+WARNING: A restricted method in java.lang.System has been called
+WARNING: java.lang.System::load has been called by net.rubygrapefruit.platform.internal.NativeLibraryLoader in an unnamed module (file:/C:/Users/Nathan%20Lee/.gradle/wrapper/dists/gradle-9.3.1-bin/23ovyewtku6u96viwx3xl3oks/gradle-9.3.1/lib/native-platform-0.22-milestone-29.jar)
+WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
+WARNING: Restricted methods will be blocked in a future release unless native access is enabled
+
+Starting a Gradle Daemon (subsequent builds will be faster)
+> Task :checkKotlinGradlePluginConfigurationErrors SKIPPED
+
+> Task :compileKotlin FAILED
+e: file:///C:/Users/Nathan%20Lee/Coding%20Projects/Java%20Projects/WerewolfHelper/src/main/kotlin/dev/robothanzo/werewolf/commands/Poll.kt:45:17 Argument type mismatch: actual type is 'Runnable', but 'Function0<Unit>?' was expected.
+
+FAILURE: Build failed with an exception.
+
+* What went wrong:
+Execution failed for task ':compileKotlin'.
+> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
+   > Compilation error. See log for more details
+
+* Try:
+> Run with --stacktrace option to get the stack trace.
+> Run with --info or --debug option to get more log output.
+> Run with --scan to get full insights from a Build Scan (powered by Develocity).
+> Get more help at https://help.gradle.org.
+
+BUILD FAILED in 35s
+1 actionable task: 1 executed

.idea/modules/dev.robothanzo.werewolf.WerewolfHelper.main.iml

@@ -35,9 +35,6 @@ export const useGameState = (guildId: string | undefined, user: User | null) =>
 
     const [showSessionExpired, setShowSessionExpired] = useState(false);
 
-    // Helpers to update overlay
-    const setOverlayVisible = (visible: boolean) => setOverlayState(prev => ({...prev, visible}));
-
     // Helper to map session data to GameState players
     const mapSessionToPlayers = (sessionData: any): Player[] => {
         return sessionData.players.map((player: any) => ({