Introduce and integrate ClawPreferences

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/dev/msfjarvis/lobsters/data/preferences/ClawPreferences.kt

@@ -0,0 +1,24 @@
+package dev.msfjarvis.lobsters.data.preferences
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
+import androidx.datastore.preferences.core.edit
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+class ClawPreferences @Inject constructor(
+  private val dataStore: DataStore<Preferences>,
+) {
+  private val sortKey = booleanPreferencesKey("post_sorting_order")
+
+  val sortingOrder: Flow<Boolean>
+    get() = dataStore.data.map { preferences -> preferences[sortKey] ?: false }
+
+  suspend fun toggleSortingOrder() {
+    dataStore.edit { preferences ->
+      preferences[sortKey] = (preferences[sortKey] ?: false).not()
+    }
+  }
+}

app/src/main/java/dev/msfjarvis/lobsters/injection/PreferenceModule.kt

@@ -0,0 +1,23 @@
+package dev.msfjarvis.lobsters.injection
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import dev.msfjarvis.lobsters.data.preferences.ClawPreferences
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object PreferenceModule {
+
+  @Provides
+  @Singleton
+  fun provideClawPreferences(
+    dataStore: DataStore<Preferences>,
+  ): ClawPreferences {
+    return ClawPreferences(dataStore)
+  }
+}

app/src/main/java/dev/msfjarvis/lobsters/ui/viewmodel/LobstersViewModel.kt

@@ -7,9 +7,11 @@ import androidx.paging.PagingConfig
 import androidx.paging.cachedIn
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dev.msfjarvis.lobsters.data.local.SavedPost
+import dev.msfjarvis.lobsters.data.preferences.ClawPreferences
 import dev.msfjarvis.lobsters.data.remote.LobstersPagingSource
 import dev.msfjarvis.lobsters.data.repo.LobstersRepository
 import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.launchIn
@@ -19,6 +21,7 @@ import kotlinx.coroutines.launch
 @HiltViewModel
 class LobstersViewModel @Inject constructor(
   private val lobstersRepository: LobstersRepository,
+  private val clawPreferences: ClawPreferences,
 ) : ViewModel() {
   private val _savedPosts = MutableStateFlow<List<SavedPost>>(emptyList())
   val savedPosts = _savedPosts.asStateFlow()
@@ -35,6 +38,14 @@ class LobstersViewModel @Inject constructor(
     }.launchIn(viewModelScope)
   }
 
+  fun getSortOrder(): Flow<Boolean> {
+    return clawPreferences.sortingOrder
+  }
+
+  suspend fun toggleSortOrder() {
+    clawPreferences.toggleSortingOrder()
+  }
+
   fun reloadPosts() {
     pagingSource?.invalidate()
   }