refactor: switch from metro to koin

Honestly metro looks too overcomplicated and I still don't know how to
use it properly. Switching to koin for now as I'm more comfortable with
it.

core/src/commonMain/kotlin/moe/lava/neon/core/AppSettings.kt

@@ -2,12 +2,7 @@ package moe.lava.neon.core
 
 import com.russhwolf.settings.Settings
 import com.russhwolf.settings.nullableString
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.Inject
-import dev.zacsweers.metro.SingleIn
 
-@SingleIn(AppScope::class)
-@Inject
 class AppSettings {
     private val settings = Settings()
 

core/src/commonMain/kotlin/moe/lava/neon/core/api/ApiClient.kt

@@ -1,9 +1,6 @@
 package moe.lava.neon.core.api
 
 import co.touchlab.kermit.Logger
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.Inject
-import dev.zacsweers.metro.SingleIn
 import io.ktor.client.HttpClient
 import io.ktor.client.call.body
 import io.ktor.client.plugins.HttpSend
@@ -23,8 +20,6 @@ import kotlinx.serialization.json.JsonNamingStrategy
 import moe.lava.neon.core.api.captcha.CaptchaRequest
 import moe.lava.neon.core.api.captcha.CaptchaResponse
 
-@SingleIn(AppScope::class)
-@Inject
 class ApiClient {
     private val logger = Logger.withTag("neon.core.api/client")
 

core/src/commonMain/kotlin/moe/lava/neon/core/api/gateway/GatewayHandler.kt

@@ -1,21 +1,19 @@
 package moe.lava.neon.core.api.gateway
 
 import co.touchlab.kermit.Logger
-import dev.zacsweers.metro.Inject
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.serialization.ExperimentalSerializationApi
-import moe.lava.neon.core.di.EventHandlerGraph
+import moe.lava.neon.core.api.gateway.handlers.EventHandlers
 import moe.lava.neon.core.repository.AuthRepository
 import kotlin.math.pow
 import kotlin.time.Duration.Companion.seconds
 
-@Inject
 class GatewayHandler(
     private val auth: AuthRepository,
-    private val handlers: EventHandlerGraph,
+    private val eventHandlers: EventHandlers,
 ) {
     private val logger = Logger.withTag("neon.core.api.gateway/handler")
     private val scope = CoroutineScope(Dispatchers.IO)
@@ -35,7 +33,7 @@ class GatewayHandler(
 
         session = GatewaySession.start(
             token = token,
-            eventHandlers = handlers,
+            eventHandlers = eventHandlers,
             resumeProps = resumeProps,
             onSuccess = {
                 logger.d { "Successful session start" }

core/src/commonMain/kotlin/moe/lava/neon/core/api/gateway/GatewaySession.kt

@@ -24,7 +24,7 @@ import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import moe.lava.neon.core.api.ApiConstants
 import moe.lava.neon.core.api.ApiConstants.json
-import moe.lava.neon.core.di.EventHandlerGraph
+import moe.lava.neon.core.api.gateway.handlers.EventHandlers
 import kotlin.random.Random
 import kotlin.time.Duration.Companion.milliseconds
 
@@ -33,7 +33,7 @@ private val logger = Logger.withTag("neon.core.api.gateway/session")
 class GatewaySession private constructor(
     private var ws: DefaultClientWebSocketSession,
     private val token: String,
-    private val handlers: EventHandlerGraph,
+    private val handlers: EventHandlers,
     private val scope: CoroutineScope,
     private var resumeProps: ResumeProperties?,
     private val onDestroy: (GatewayCloseReason, ResumeProperties?) -> Unit,
@@ -46,7 +46,7 @@ class GatewaySession private constructor(
     companion object {
         suspend fun start(
             token: String,
-            eventHandlers: EventHandlerGraph,
+            eventHandlers: EventHandlers,
             client: HttpClient = HttpClient {
                 install(HttpCookies)
                 install(WebSockets)

core/src/commonMain/kotlin/moe/lava/neon/core/api/gateway/handlers/EventHandlers.kt

@@ -3,3 +3,7 @@ package moe.lava.neon.core.api.gateway.handlers
 import moe.lava.neon.core.api.gateway.Event
 
 sealed interface Handler<T: Event.Incoming>
+
+class EventHandlers(
+    val ready: ReadyHandler
+)

core/src/commonMain/kotlin/moe/lava/neon/core/api/gateway/handlers/ReadyHandler.kt

@@ -1,13 +1,11 @@
 package moe.lava.neon.core.api.gateway.handlers
 
 import co.touchlab.kermit.Logger
-import dev.zacsweers.metro.Inject
 import moe.lava.neon.core.api.gateway.Event
 import moe.lava.neon.core.api.gateway.ResumeProperties
 
 private val logger = Logger.withTag("neon.core.api.events/ready")
 
-@Inject
 class ReadyHandler : Handler<Event.Ready> {
     fun handle(event: Event.Ready, updateResumeProps: (ResumeProperties) -> Unit) {
         logger.i { "Received payload $event" }

core/src/commonMain/kotlin/moe/lava/neon/core/di/AppGraph.kt

@@ -1,18 +0,0 @@
-package moe.lava.neon.core.di
-
-import dev.zacsweers.metro.GraphExtension
-import moe.lava.neon.core.AppSettings
-import moe.lava.neon.core.api.ApiClient
-import moe.lava.neon.core.repository.AuthRepository
-import moe.lava.neon.core.repository.UserRepository
-
-@GraphExtension
-interface AppGraph {
-    val api: ApiClient
-    val settings: AppSettings
-
-    val auth: AuthRepository
-    val users: UserRepository
-
-    val gatewayHandlers: EventHandlerGraph
-}

core/src/commonMain/kotlin/moe/lava/neon/core/di/CoreModule.kt

@@ -0,0 +1,24 @@
+package moe.lava.neon.core.di
+
+import moe.lava.neon.core.AppSettings
+import moe.lava.neon.core.api.ApiClient
+import moe.lava.neon.core.api.gateway.GatewayHandler
+import moe.lava.neon.core.api.gateway.handlers.EventHandlers
+import moe.lava.neon.core.api.gateway.handlers.ReadyHandler
+import moe.lava.neon.core.repository.AuthRepository
+import moe.lava.neon.core.repository.UserRepository
+import org.koin.dsl.module
+import org.koin.plugin.module.dsl.single
+
+val coreModule = module {
+    single<ApiClient>()
+    single<AppSettings>()
+
+    single<AuthRepository>()
+    single<UserRepository>()
+
+    single<GatewayHandler>()
+
+    single<ReadyHandler>()
+    single<EventHandlers>()
+}

core/src/commonMain/kotlin/moe/lava/neon/core/di/EventHandlerGraph.kt

@@ -1,12 +0,0 @@
-package moe.lava.neon.core.di
-
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.ContributesTo
-import dev.zacsweers.metro.GraphExtension
-import moe.lava.neon.core.api.gateway.handlers.ReadyHandler
-
-@GraphExtension
-@ContributesTo(AppScope::class)
-interface EventHandlerGraph {
-    val ready: ReadyHandler
-}

core/src/commonMain/kotlin/moe/lava/neon/core/repository/AuthRepository.kt

@@ -1,9 +1,6 @@
 package moe.lava.neon.core.repository
 
 import co.touchlab.kermit.Logger
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.Inject
-import dev.zacsweers.metro.SingleIn
 import io.ktor.client.call.body
 import io.ktor.client.request.get
 import io.ktor.client.request.header
@@ -46,8 +43,6 @@ sealed class AuthResponse {
 //    data class MFARequested() : AuthResponse()
 }
 
-@Inject
-@SingleIn(AppScope::class)
 class AuthRepository(
     private val settings: AppSettings,
     private val api: ApiClient,

core/src/commonMain/kotlin/moe/lava/neon/core/repository/UserRepository.kt

@@ -1,10 +1,4 @@
 package moe.lava.neon.core.repository
 
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.Inject
-import dev.zacsweers.metro.SingleIn
-
-@Inject
-@SingleIn(AppScope::class)
 class UserRepository {
 }