refactor: hoist state out of UserProfile

Solves the issue of every pop of the backstack causing data to be re-fetched,
but now has the issue of the data being stale for a few frames. Still better
than the current state, so I'll take it.

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/screens/LobstersPostsScreen.kt

@@ -222,7 +222,6 @@ fun LobstersPostsScreen(
           ) { dest ->
             UserProfile(
               username = dest.username,
-              getProfile = viewModel::getUserProfile,
               contentPadding = contentPadding,
               openUserProfile = { clawBackStack.add(User(it)) },
             )

android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/ClawViewModel.kt

@@ -161,17 +161,6 @@ constructor(
   suspend fun getLinkMetadata(url: String) =
     withContext(ioDispatcher) { linkMetadataRepository.getLinkMetadata(url) }
 
-  suspend fun getUserProfile(username: String) =
-    withContext(ioDispatcher) {
-      when (val result = api.getUser(username)) {
-        is Success -> result.value
-        is Failure.NetworkFailure -> throw result.error
-        is Failure.UnknownFailure -> throw result.error
-        is Failure.HttpFailure -> throw result.toError()
-        is Failure.ApiFailure -> throw IOException("API returned an invalid response")
-      }
-    }
-
   suspend fun importPosts(input: InputStream) = dataTransferRepository.importPosts(input)
 
   suspend fun exportPostsAsJson(output: OutputStream) =

common/build.gradle.kts

@@ -25,6 +25,8 @@ android {
   namespace = "dev.msfjarvis.claw.common"
 }
 
+whetstone.addOns.compose = true
+
 androidComponents { beforeVariants { (it as HasUnitTestBuilder).enableUnitTest = false } }
 
 anvil { generateDaggerFactories.set(true) }
@@ -40,6 +42,7 @@ dependencies {
   api(libs.androidx.compose.ui)
   api(libs.dagger)
   api(libs.javax.inject)
+  api(projects.api)
   api(projects.core)
   api(projects.database.core)
   api(projects.model)

common/src/main/kotlin/dev/msfjarvis/claw/common/user/UserProfile.kt

@@ -20,17 +20,14 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.produceState
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.text.LinkAnnotation
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.unit.dp
-import com.github.michaelbull.result.coroutines.runSuspendCatching
-import com.github.michaelbull.result.fold
-import dev.msfjarvis.claw.common.NetworkState
+import com.deliveryhero.whetstone.compose.injectedViewModel
 import dev.msfjarvis.claw.common.NetworkState.Error
 import dev.msfjarvis.claw.common.NetworkState.Loading
 import dev.msfjarvis.claw.common.NetworkState.Success
@@ -44,35 +41,25 @@ import dev.msfjarvis.claw.model.User
 @Composable
 fun UserProfile(
   username: String,
-  getProfile: suspend (username: String) -> User,
-  openUserProfile: (String) -> Unit,
   contentPadding: PaddingValues,
+  openUserProfile: (String) -> Unit,
   modifier: Modifier = Modifier,
+  viewModel: UserProfileViewModel = injectedViewModel(),
 ) {
-  val user by
-    produceState<NetworkState>(Loading) {
-      runSuspendCatching { getProfile(username) }
-        .fold(
-          success = { profile -> value = Success(profile) },
-          failure = {
-            value = Error(error = it, description = "Failed to load profile for $username")
-          },
-        )
-    }
-  when (user) {
+  LaunchedEffect(username) { viewModel.loadProfile(username) }
+  when (val state = viewModel.userProfile) {
     is Success<*> -> {
       UserProfileInternal(
-        user = (user as Success<User>).data,
+        user = (state as Success<User>).data,
         openUserProfile = openUserProfile,
         modifier = modifier.padding(contentPadding),
       )
     }
     is Error -> {
-      val error = user as Error
       Box(modifier = Modifier.padding(contentPadding).fillMaxSize()) {
         NetworkError(
-          label = error.description,
-          error = error.error,
+          label = state.description,
+          error = state.error,
           modifier = Modifier.align(Alignment.Center),
         )
       }

common/src/main/kotlin/dev/msfjarvis/claw/common/user/UserProfileViewModel.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright © Harsh Shandilya.
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+package dev.msfjarvis.claw.common.user
+
+import android.app.Application
+import android.content.Context
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.lifecycle.AndroidViewModel
+import com.deliveryhero.whetstone.app.ApplicationScope
+import com.deliveryhero.whetstone.viewmodel.ContributesViewModel
+import com.github.michaelbull.result.coroutines.runSuspendCatching
+import com.github.michaelbull.result.fold
+import com.slack.eithernet.ApiResult
+import com.slack.eithernet.ApiResult.Failure
+import com.squareup.anvil.annotations.optional.ForScope
+import dev.msfjarvis.claw.api.LobstersApi
+import dev.msfjarvis.claw.api.toError
+import dev.msfjarvis.claw.common.NetworkState
+import dev.msfjarvis.claw.common.NetworkState.Error
+import dev.msfjarvis.claw.common.NetworkState.Loading
+import dev.msfjarvis.claw.common.NetworkState.Success
+import dev.msfjarvis.claw.core.injection.IODispatcher
+import dev.msfjarvis.claw.model.User
+import java.io.IOException
+import javax.inject.Inject
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+
+@ContributesViewModel
+class UserProfileViewModel
+@Inject
+constructor(
+  private val api: LobstersApi,
+  @IODispatcher private val ioDispatcher: CoroutineDispatcher,
+  @ForScope(ApplicationScope::class) context: Context,
+) : AndroidViewModel(context as Application) {
+
+  var userProfile by mutableStateOf<NetworkState>(Loading)
+
+  suspend fun loadProfile(username: String) {
+    userProfile =
+      runSuspendCatching<User> {
+          withContext(ioDispatcher) {
+            when (val result = api.getUser(username)) {
+              is ApiResult.Success -> result.value
+              is Failure.NetworkFailure -> throw result.error
+              is Failure.UnknownFailure -> throw result.error
+              is Failure.HttpFailure -> throw result.toError()
+              is Failure.ApiFailure -> throw IOException("API returned an invalid response")
+            }
+          }
+        }
+        .fold(
+          success = { profile -> Success(profile) },
+          failure = { Error(error = it, description = "Failed to load profile for $username") },
+        )
+  }
+}