feat: splash screen, move login branching logic out of greeter

app/src/main/java/chat/revolt/MainActivity.kt

@@ -12,6 +12,7 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.IntOffset
+import chat.revolt.screens.SplashScreen
 import chat.revolt.screens.about.AboutScreen
 import chat.revolt.screens.about.AttributionScreen
 import chat.revolt.screens.about.PlaceholderScreen
@@ -52,7 +53,7 @@ fun AppEntrypoint() {
 
     AnimatedNavHost(
         navController = navController,
-        startDestination = "login/greeting",
+        startDestination = "splash",
         enterTransition = {
             slideIntoContainer(
                 AnimatedContentScope.SlideDirection.Left,
@@ -78,6 +79,8 @@ fun AppEntrypoint() {
             ) + fadeOut(animationSpec = RevoltTweenFloat)
         }
     ) {
+        composable("splash") { SplashScreen(navController) }
+
         composable("login/greeting") { GreeterScreen(navController) }
         composable("login/login") { LoginScreen(navController) }
         composable("login/mfa/{mfaTicket}/{allowedAuthTypes}") { backStackEntry ->

app/src/main/java/chat/revolt/api/RevoltAPI.kt

@@ -3,6 +3,7 @@ package chat.revolt.api
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
+import androidx.compose.runtime.mutableStateMapOf
 import chat.revolt.api.realtime.RealtimeSocket
 import chat.revolt.api.routes.user.fetchSelf
 import chat.revolt.api.schemas.*
@@ -61,11 +62,11 @@ object RevoltAPI {
     const val TOKEN_HEADER_NAME = "x-session-token"
 
     // FIXME discount caching solutions! LRU would be better but this is fine for now
-    val userCache = mutableMapOf<String, User>()
-    val serverCache = mutableMapOf<String, Server>()
-    val channelCache = mutableMapOf<String, Channel>()
-    val emojiCache = mutableMapOf<String, Emoji>()
-    val messageCache = mutableMapOf<String, Message>()
+    val userCache = mutableStateMapOf<String, User>()
+    val serverCache = mutableStateMapOf<String, Server>()
+    val channelCache = mutableStateMapOf<String, Channel>()
+    val emojiCache = mutableStateMapOf<String, Emoji>()
+    val messageCache = mutableStateMapOf<String, Message>()
 
     var selfId: String? = null
 

app/src/main/java/chat/revolt/screens/SplashScreen.kt

@@ -0,0 +1,92 @@
+package chat.revolt.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import androidx.navigation.NavController
+import chat.revolt.R
+import chat.revolt.api.RevoltAPI
+import chat.revolt.components.generic.RemoteImage
+import chat.revolt.components.generic.drawableResource
+import chat.revolt.persistence.KVStorage
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+@HiltViewModel
+class SplashScreenViewModel @Inject constructor(
+    private val kvStorage: KVStorage
+) : ViewModel() {
+    private var _navigateTo by mutableStateOf("")
+    val navigateTo: String
+        get() = _navigateTo
+
+    fun setNavigateTo(value: String) {
+        _navigateTo = value
+    }
+
+    init {
+        viewModelScope.launch {
+            val token = kvStorage.get("sessionToken") ?: return@launch setNavigateTo("login")
+
+            val valid = RevoltAPI.checkSessionToken(token)
+
+            if (!valid) {
+                kvStorage.remove("sessionToken")
+                setNavigateTo("login")
+            } else {
+                RevoltAPI.loginAs(token)
+                setNavigateTo("home")
+            }
+        }
+    }
+}
+
+@Composable
+fun SplashScreen(navController: NavController, viewModel: SplashScreenViewModel = hiltViewModel()) {
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .fillMaxHeight(),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        RemoteImage(
+            url = drawableResource(R.drawable.revolt_logo_wide),
+            description = "Revolt Logo",
+            contentScale = ContentScale.Fit,
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(60.dp)
+        )
+    }
+
+    if (viewModel.navigateTo.isNotEmpty()) {
+        when (viewModel.navigateTo) {
+            "login" -> {
+                navController.navigate("login/greeting") {
+                    popUpTo("splash") {
+                        inclusive = true
+                    }
+                }
+            }
+            "home" -> {
+                navController.navigate("chat/home") {
+                    popUpTo("splash") {
+                        inclusive = true
+                    }
+                }
+            }
+        }
+        viewModel.setNavigateTo("")
+    }
+}

app/src/main/java/chat/revolt/screens/chat/HomeScreen.kt

@@ -105,7 +105,6 @@ fun HomeScreen(navController: NavController, viewModel: HomeScreenViewModel = hi
                 }
             }
 
-            // a scrollable list of all users in user cache
             Text(
                 text = "User cache",
                 style = MaterialTheme.typography.displaySmall.copy(

app/src/main/java/chat/revolt/screens/login/GreeterScreen.kt

@@ -7,9 +7,6 @@ import androidx.compose.material3.ElevatedButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -19,90 +16,12 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import androidx.hilt.navigation.compose.hiltViewModel
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewModelScope
 import androidx.navigation.NavController
-import chat.revolt.api.RevoltAPI
 import chat.revolt.components.generic.RemoteImage
 import chat.revolt.components.generic.drawableResource
-import chat.revolt.persistence.KVStorage
-import dagger.hilt.android.lifecycle.HiltViewModel
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-
-@HiltViewModel
-class GreeterViewModel @Inject constructor(
-    private val kvStorage: KVStorage
-) : ViewModel() {
-    private var _skipLogin by mutableStateOf(false)
-    val skipLogin: Boolean
-        get() = _skipLogin
-
-    private var _finishedLoading by mutableStateOf(false)
-    val finishedLoading: Boolean
-        get() = _finishedLoading
-
-    fun setSkipLogin(value: Boolean) {
-        _skipLogin = value
-    }
-
-    fun setFinishedLoading(value: Boolean) {
-        _finishedLoading = value
-    }
-
-    init {
-        viewModelScope.launch {
-            val token = kvStorage.get("sessionToken")
-            if (token != null) {
-                val valid = RevoltAPI.checkSessionToken(token)
-                if (!valid) {
-                    kvStorage.remove("sessionToken")
-                    RevoltAPI.setSessionHeader("")
-                }
-            }
-
-            if (RevoltAPI.isLoggedIn()) {
-                RevoltAPI.loginAs(token ?: "")
-                _skipLogin = true
-            }
-
-            setFinishedLoading(true)
-        }
-    }
-}
 
 @Composable
-fun GreeterScreen(navController: NavController, viewModel: GreeterViewModel = hiltViewModel()) {
-    if (viewModel.skipLogin) {
-        navController.navigate("chat/home") {
-            popUpTo("login/greeting") {
-                inclusive = true
-            }
-        }
-        viewModel.setSkipLogin(false)
-    }
-
-    if (!viewModel.finishedLoading) {
-        Column(
-            modifier = Modifier
-                .fillMaxWidth()
-                .fillMaxHeight(),
-            verticalArrangement = Arrangement.Center,
-            horizontalAlignment = Alignment.CenterHorizontally
-        ) {
-            RemoteImage(
-                url = drawableResource(R.drawable.revolt_logo_wide),
-                description = "Revolt Logo",
-                contentScale = ContentScale.Fit,
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(60.dp)
-            )
-        }
-        return
-    }
-
+fun GreeterScreen(navController: NavController) {
     Column(
         modifier = Modifier
             .fillMaxWidth()