Added dependency injection for DataStore

app/src/main/java/com/sadellie/unitto/data/preferences/DataStoreModule.kt

@@ -0,0 +1,41 @@
+package com.sadellie.unitto.data.preferences
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.core.handlers.ReplaceFileCorruptionHandler
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.emptyPreferences
+import androidx.datastore.preferences.preferencesDataStoreFile
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+// DON'T TOUCH!!!
+private const val USER_PREFERENCES = "settings"
+
+/**
+ * This module is for DataStore dependency injection
+ */
+@InstallIn(SingletonComponent::class)
+@Module
+class DataStoreModule {
+
+    /**
+     * Tells Hilt to use this method to get [DataStore]
+     *
+     * @param appContext
+     * @return Singleton of [DataStore]
+     */
+    @Singleton
+    @Provides
+    fun provideUserPreferencesDataStore(@ApplicationContext appContext: Context): DataStore<Preferences> {
+        return PreferenceDataStoreFactory.create(
+            corruptionHandler = ReplaceFileCorruptionHandler { emptyPreferences() },
+            produceFile = { appContext.preferencesDataStoreFile(USER_PREFERENCES) }
+        )
+    }
+}

app/src/main/java/com/sadellie/unitto/data/preferences/UserPreferences.kt

@@ -1,21 +1,14 @@
 package com.sadellie.unitto.data.preferences
 
-import android.content.Context
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.*
-import androidx.datastore.preferences.preferencesDataStore
 import com.sadellie.unitto.data.units.AbstractUnit
 import com.sadellie.unitto.data.units.MyUnitIDS
-import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import javax.inject.Inject
 
 
-// It's at the top level to make DataStore singleton
-// DON'T TOUCH STRINGS!!!
-private val Context.settingsDataStore by preferencesDataStore("settings")
-
 /**
  * Represents user preferences that are user across the app
  *
@@ -39,12 +32,8 @@ data class UserPreferences(
 
 /**
  * Repository that works with DataStore
- *
- * @property context
  */
-class UserPreferencesRepository @Inject constructor(@ApplicationContext private val context: Context) {
-
-    private val dataStore: DataStore<Preferences> = context.settingsDataStore
+class UserPreferencesRepository @Inject constructor(private val dataStore: DataStore<Preferences>) {
 
     /**
      * Keys for DataStore