BackupManager

closes: #4

core/ui/src/main/java/com/sadellie/unitto/core/ui/common/UnittoScreenWithLargeTopBar.kt

@@ -19,6 +19,7 @@
 package com.sadellie.unitto.core.ui.common
 
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.RowScope
 import androidx.compose.material3.LargeTopAppBar
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
@@ -39,6 +40,7 @@ import androidx.compose.ui.input.nestedscroll.nestedScroll
 fun UnittoScreenWithLargeTopBar(
     title: String,
     navigationIcon: @Composable () -> Unit,
+    actions: @Composable RowScope.() -> Unit = {},
     content: @Composable (PaddingValues) -> Unit
 ) {
     val scrollBehavior = TopAppBarDefaults.exitUntilCollapsedScrollBehavior(
@@ -53,7 +55,8 @@ fun UnittoScreenWithLargeTopBar(
                     Text(text = title)
                 },
                 navigationIcon = navigationIcon,
-                scrollBehavior = scrollBehavior
+                scrollBehavior = scrollBehavior,
+                actions = actions
             )
         },
         content = content

data/backup/.gitignore

@@ -0,0 +1 @@
+/build

data/backup/build.gradle.kts

@@ -0,0 +1,36 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+plugins {
+    id("unitto.library")
+    id("unitto.android.library.jacoco")
+    id("unitto.android.hilt")
+}
+
+android {
+    namespace = "com.sadellie.unitto.data.backup"
+}
+
+dependencies {
+    implementation(libs.androidx.datastore.datastore.preferences)
+    implementation(libs.com.squareup.moshi.moshi.kotlin)
+
+    implementation(project(":data:database"))
+    implementation(project(":data:model"))
+    implementation(project(":data:userprefs"))
+}

data/backup/src/androidTest/java/com/sadellie/unitto/data/backup/BackupManagerTest.kt

@@ -0,0 +1,206 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.preferencesDataStoreFile
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.sadellie.unitto.data.userprefs.PrefsKeys
+import com.sadellie.unitto.data.userprefs.getThemingMode
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.runBlocking
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class BackupManagerTest {
+
+    private lateinit var dataStore: DataStore<Preferences>
+    private lateinit var backupManager: BackupManager
+
+    @Before
+    fun setup() {
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+
+        dataStore = PreferenceDataStoreFactory.create(
+            corruptionHandler = null,
+            produceFile = { appContext.preferencesDataStoreFile("test") }
+        )
+
+        backupManager = BackupManager(
+            mContext = appContext,
+            dataStore = dataStore,
+            unitsDao = FakeUnitsDao,
+            timeZoneDao = FakeTimeZoneDao
+        )
+
+        runBlocking {
+            dataStore.edit {
+                it[PrefsKeys.THEMING_MODE] = FakeUsrPreferenceValues.themingMode
+                it[PrefsKeys.ENABLE_DYNAMIC_THEME] = FakeUsrPreferenceValues.enableDynamicTheme
+                it[PrefsKeys.ENABLE_AMOLED_THEME] = FakeUsrPreferenceValues.enableAmoledTheme
+                it[PrefsKeys.CUSTOM_COLOR] = FakeUsrPreferenceValues.customColor
+                it[PrefsKeys.MONET_MODE] = FakeUsrPreferenceValues.monetMode
+                it[PrefsKeys.STARTING_SCREEN] = FakeUsrPreferenceValues.startingScreen
+                it[PrefsKeys.ENABLE_TOOLS_EXPERIMENT] = FakeUsrPreferenceValues.enableToolsExperiment
+                it[PrefsKeys.ENABLE_VIBRATIONS] = FakeUsrPreferenceValues.enableVibrations
+                it[PrefsKeys.MIDDLE_ZERO] = FakeUsrPreferenceValues.middleZero
+                it[PrefsKeys.AC_BUTTON] = FakeUsrPreferenceValues.acButton
+                it[PrefsKeys.RPN_MODE] = FakeUsrPreferenceValues.rpnMode
+
+                // FORMATTER
+                it[PrefsKeys.DIGITS_PRECISION] = FakeUsrPreferenceValues.precision
+                it[PrefsKeys.SEPARATOR] = FakeUsrPreferenceValues.separator
+                it[PrefsKeys.OUTPUT_FORMAT] = FakeUsrPreferenceValues.outputFormat
+
+                // CALCULATOR
+                it[PrefsKeys.RADIAN_MODE] = FakeUsrPreferenceValues.radianMode
+                it[PrefsKeys.PARTIAL_HISTORY_VIEW] = FakeUsrPreferenceValues.partialHistoryView
+                it[PrefsKeys.CLEAR_INPUT_AFTER_EQUALS] = FakeUsrPreferenceValues.clearInputAfterEquals
+
+                // UNIT CONVERTER
+                it[PrefsKeys.LATEST_LEFT_SIDE] = FakeUsrPreferenceValues.latestLeftSide
+                it[PrefsKeys.LATEST_RIGHT_SIDE] = FakeUsrPreferenceValues.latestRightSide
+                it[PrefsKeys.SHOWN_UNIT_GROUPS] = FakeUsrPreferenceValues.shownUnitGroups.joinToString(",")
+                it[PrefsKeys.UNIT_CONVERTER_FAVORITES_ONLY] = FakeUsrPreferenceValues.unitConverterFavoritesOnly
+                it[PrefsKeys.UNIT_CONVERTER_FORMAT_TIME] = FakeUsrPreferenceValues.unitConverterFormatTime
+                it[PrefsKeys.UNIT_CONVERTER_SORTING] = FakeUsrPreferenceValues.unitConverterSorting.name
+            }
+        }
+    }
+
+    @Test
+    fun getUserDataTest() = runBlocking{
+        val actualUserData = backupManager.userDataFromApp()
+        val expectedUserData = UserData(
+            themingMode = FakeUsrPreferenceValues.themingMode,
+            enableDynamicTheme = FakeUsrPreferenceValues.enableDynamicTheme,
+            enableAmoledTheme = FakeUsrPreferenceValues.enableAmoledTheme,
+            customColor = FakeUsrPreferenceValues.customColor,
+            monetMode = FakeUsrPreferenceValues.monetMode,
+            startingScreen = FakeUsrPreferenceValues.startingScreen,
+            enableToolsExperiment = FakeUsrPreferenceValues.enableToolsExperiment,
+            enableVibrations = FakeUsrPreferenceValues.enableVibrations,
+            middleZero = FakeUsrPreferenceValues.middleZero,
+            acButton = FakeUsrPreferenceValues.acButton,
+            rpnMode = FakeUsrPreferenceValues.rpnMode,
+            precision = FakeUsrPreferenceValues.precision,
+            separator = FakeUsrPreferenceValues.separator,
+            outputFormat = FakeUsrPreferenceValues.outputFormat,
+            radianMode = FakeUsrPreferenceValues.radianMode,
+            partialHistoryView = FakeUsrPreferenceValues.partialHistoryView,
+            clearInputAfterEquals = FakeUsrPreferenceValues.clearInputAfterEquals,
+            latestLeftSide = FakeUsrPreferenceValues.latestLeftSide,
+            latestRightSide = FakeUsrPreferenceValues.latestRightSide,
+            shownUnitGroups = FakeUsrPreferenceValues.shownUnitGroups,
+            unitConverterFavoritesOnly = FakeUsrPreferenceValues.unitConverterFavoritesOnly,
+            unitConverterFormatTime = FakeUsrPreferenceValues.unitConverterFormatTime,
+            unitConverterSorting = FakeUsrPreferenceValues.unitConverterSorting,
+            unitsTable = units,
+            timeZoneTable = timeZones
+        )
+
+        assertEquals(expectedUserData, actualUserData)
+    }
+
+    @Test
+    fun updateDatastoreTest() = runBlocking{
+        backupManager.updateDatastore(
+            UserData(
+                themingMode = FakeUsrPreferenceValues.themingMode,
+                enableDynamicTheme = FakeUsrPreferenceValues.enableDynamicTheme,
+                enableAmoledTheme = FakeUsrPreferenceValues.enableAmoledTheme,
+                customColor = FakeUsrPreferenceValues.customColor,
+                monetMode = FakeUsrPreferenceValues.monetMode,
+                startingScreen = FakeUsrPreferenceValues.startingScreen,
+                enableToolsExperiment = FakeUsrPreferenceValues.enableToolsExperiment,
+                enableVibrations = FakeUsrPreferenceValues.enableVibrations,
+                middleZero = FakeUsrPreferenceValues.middleZero,
+                acButton = FakeUsrPreferenceValues.acButton,
+                rpnMode = FakeUsrPreferenceValues.rpnMode,
+                precision = FakeUsrPreferenceValues.precision,
+                separator = FakeUsrPreferenceValues.separator,
+                outputFormat = FakeUsrPreferenceValues.outputFormat,
+                radianMode = FakeUsrPreferenceValues.radianMode,
+                partialHistoryView = FakeUsrPreferenceValues.partialHistoryView,
+                clearInputAfterEquals = FakeUsrPreferenceValues.clearInputAfterEquals,
+                latestLeftSide = FakeUsrPreferenceValues.latestLeftSide,
+                latestRightSide = FakeUsrPreferenceValues.latestRightSide,
+                shownUnitGroups = FakeUsrPreferenceValues.shownUnitGroups,
+                unitConverterFavoritesOnly = FakeUsrPreferenceValues.unitConverterFavoritesOnly,
+                unitConverterFormatTime = FakeUsrPreferenceValues.unitConverterFormatTime,
+                unitConverterSorting = FakeUsrPreferenceValues.unitConverterSorting,
+                unitsTable = units,
+                timeZoneTable = timeZones
+            )
+        )
+
+        val data = dataStore.data.first()
+        // TODO Wrong implementation, should test all
+        assertEquals(FakeUsrPreferenceValues.themingMode, data.getThemingMode())
+    }
+
+    @Test
+    fun updateUnitsTableTest() = runBlocking {
+        backupManager.updateUnitsTable(
+            UserData(
+                themingMode = FakeUsrPreferenceValues.themingMode,
+                enableDynamicTheme = FakeUsrPreferenceValues.enableDynamicTheme,
+                enableAmoledTheme = FakeUsrPreferenceValues.enableAmoledTheme,
+                customColor = FakeUsrPreferenceValues.customColor,
+                monetMode = FakeUsrPreferenceValues.monetMode,
+                startingScreen = FakeUsrPreferenceValues.startingScreen,
+                enableToolsExperiment = FakeUsrPreferenceValues.enableToolsExperiment,
+                enableVibrations = FakeUsrPreferenceValues.enableVibrations,
+                middleZero = FakeUsrPreferenceValues.middleZero,
+                acButton = FakeUsrPreferenceValues.acButton,
+                rpnMode = FakeUsrPreferenceValues.rpnMode,
+                precision = FakeUsrPreferenceValues.precision,
+                separator = FakeUsrPreferenceValues.separator,
+                outputFormat = FakeUsrPreferenceValues.outputFormat,
+                radianMode = FakeUsrPreferenceValues.radianMode,
+                partialHistoryView = FakeUsrPreferenceValues.partialHistoryView,
+                clearInputAfterEquals = FakeUsrPreferenceValues.clearInputAfterEquals,
+                latestLeftSide = FakeUsrPreferenceValues.latestLeftSide,
+                latestRightSide = FakeUsrPreferenceValues.latestRightSide,
+                shownUnitGroups = FakeUsrPreferenceValues.shownUnitGroups,
+                unitConverterFavoritesOnly = FakeUsrPreferenceValues.unitConverterFavoritesOnly,
+                unitConverterFormatTime = FakeUsrPreferenceValues.unitConverterFormatTime,
+                unitConverterSorting = FakeUsrPreferenceValues.unitConverterSorting,
+                unitsTable = emptyList(),
+                timeZoneTable = timeZones
+            )
+        )
+
+        val data = FakeUnitsDao.getAllFlow().first()
+        // TODO Wrong implementation
+        assertEquals("$units | $data", units, data)
+    }
+}

data/backup/src/androidTest/java/com/sadellie/unitto/data/backup/FakeTimeZoneDao.kt

@@ -0,0 +1,54 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import com.sadellie.unitto.data.database.TimeZoneDao
+import com.sadellie.unitto.data.database.TimeZoneEntity
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+
+val timeZones = listOf(
+    TimeZoneEntity(
+        id = "id1",
+        position = 9,
+        label = "label"
+    ),
+    TimeZoneEntity(
+        id = "id2",
+        position = 9,
+        label = "label"
+    )
+)
+
+object FakeTimeZoneDao: TimeZoneDao {
+    override fun getFavorites(): Flow<List<TimeZoneEntity>> {
+        return flow {
+            emit(timeZones)
+        }
+    }
+
+    override fun getMaxPosition(): Int = 0
+    override suspend fun insert(vararg timeZoneEntity: TimeZoneEntity) {}
+    override suspend fun removeFromFavorites(id: String) {}
+    override suspend fun updateLabel(id: String, label: String) {}
+    override suspend fun updateDragged(id: String, oldPosition: Int, newPosition: Int) {}
+    override suspend fun moveDown(currentPosition: Int, targetPosition: Int) {}
+    override suspend fun moveUp(currentPosition: Int, targetPosition: Int) {}
+    override suspend fun clear() {}
+}

data/backup/src/androidTest/java/com/sadellie/unitto/data/backup/FakeUnitsDao.kt

@@ -0,0 +1,51 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import com.sadellie.unitto.data.database.UnitsDao
+import com.sadellie.unitto.data.database.UnitsEntity
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+
+val units = listOf(
+    UnitsEntity(
+        unitId = "UnitId1",
+        isFavorite = false,
+        pairedUnitId = "Pair",
+        frequency = 9
+    ),
+    UnitsEntity(
+        unitId = "UnitId2",
+        isFavorite = false,
+        pairedUnitId = "Pair",
+        frequency = 9
+    )
+)
+
+object FakeUnitsDao : UnitsDao {
+    override fun getAllFlow(): Flow<List<UnitsEntity>> {
+        return flow {
+            emit(units)
+        }
+    }
+
+    override suspend fun insertUnit(unit: UnitsEntity) {}
+    override suspend fun getById(unitId: String): UnitsEntity? = null
+    override suspend fun clear() {}
+}

data/backup/src/androidTest/java/com/sadellie/unitto/data/backup/FakeUserPreferencesRepository.kt

@@ -0,0 +1,48 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import com.sadellie.unitto.data.model.ALL_UNIT_GROUPS
+import com.sadellie.unitto.data.model.UnitsListSorting
+
+object FakeUsrPreferenceValues {
+    const val themingMode = "ThemingMode"
+    const val enableDynamicTheme = false
+    const val enableAmoledTheme = false
+    const val customColor = 777L
+    const val monetMode = "MonetMode"
+    const val startingScreen = "StartingScreen"
+    const val enableToolsExperiment = false
+    const val enableVibrations = false
+    const val middleZero = false
+    const val acButton = false
+    const val rpnMode = false
+    const val precision = 69
+    const val separator = 1
+    const val outputFormat = 1
+    const val radianMode = false
+    const val partialHistoryView = false
+    const val clearInputAfterEquals = false
+    const val latestLeftSide = "LeftSideUnit"
+    const val latestRightSide = "RightSideUnit"
+    val shownUnitGroups = ALL_UNIT_GROUPS
+    const val unitConverterFavoritesOnly = false
+    const val unitConverterFormatTime = false
+    val unitConverterSorting = UnitsListSorting.USAGE
+}

data/backup/src/main/AndroidManifest.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Unitto is a unit converter for Android
+  ~ Copyright (c) 2023 Elshan Agaev
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ (at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application>
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="com.sadellie.unitto.BackupManager"
+            android:grantUriPermissions="true"
+            android:exported="false">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_provider_path"/>
+        </provider>
+    </application>
+</manifest>

data/backup/src/main/java/com/sadellie/unitto/data/backup/BackupManager.kt

@@ -0,0 +1,191 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import android.content.Context
+import android.net.Uri
+import androidx.core.content.FileProvider
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+import com.sadellie.unitto.data.database.TimeZoneDao
+import com.sadellie.unitto.data.database.UnitsDao
+import com.sadellie.unitto.data.userprefs.PrefsKeys
+import com.sadellie.unitto.data.userprefs.getAcButton
+import com.sadellie.unitto.data.userprefs.getClearInputAfterEquals
+import com.sadellie.unitto.data.userprefs.getCustomColor
+import com.sadellie.unitto.data.userprefs.getDigitsPrecision
+import com.sadellie.unitto.data.userprefs.getEnableAmoledTheme
+import com.sadellie.unitto.data.userprefs.getEnableDynamicTheme
+import com.sadellie.unitto.data.userprefs.getEnableToolsExperiment
+import com.sadellie.unitto.data.userprefs.getEnableVibrations
+import com.sadellie.unitto.data.userprefs.getLatestLeftSide
+import com.sadellie.unitto.data.userprefs.getLatestRightSide
+import com.sadellie.unitto.data.userprefs.getMiddleZero
+import com.sadellie.unitto.data.userprefs.getMonetMode
+import com.sadellie.unitto.data.userprefs.getOutputFormat
+import com.sadellie.unitto.data.userprefs.getPartialHistoryView
+import com.sadellie.unitto.data.userprefs.getRadianMode
+import com.sadellie.unitto.data.userprefs.getRpnMode
+import com.sadellie.unitto.data.userprefs.getSeparator
+import com.sadellie.unitto.data.userprefs.getShownUnitGroups
+import com.sadellie.unitto.data.userprefs.getStartingScreen
+import com.sadellie.unitto.data.userprefs.getThemingMode
+import com.sadellie.unitto.data.userprefs.getUnitConverterFavoritesOnly
+import com.sadellie.unitto.data.userprefs.getUnitConverterFormatTime
+import com.sadellie.unitto.data.userprefs.getUnitConverterSorting
+import com.squareup.moshi.JsonAdapter
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.withContext
+import java.io.BufferedReader
+import java.io.File
+import java.io.InputStreamReader
+import javax.inject.Inject
+
+class BackupManager @Inject constructor(
+    @ApplicationContext private val mContext: Context,
+    private val dataStore: DataStore<Preferences>,
+    private val unitsDao: UnitsDao,
+    private val timeZoneDao: TimeZoneDao,
+    // Not planned at the moment
+    // private val calculatorHistoryDao: CalculatorHistoryDao,
+) {
+    private val moshi: Moshi = Moshi.Builder()
+        .addLast(KotlinJsonAdapterFactory())
+        .build()
+    private val jsonAdapter: JsonAdapter<UserData> = moshi.adapter(UserData::class.java)
+    private val auth = "com.sadellie.unitto.BackupManager"
+
+    suspend fun backup(): Uri = withContext(Dispatchers.IO) {
+        val userData = userDataFromApp()
+        // save to disk
+        val tempFile = File.createTempFile("backup", ".unitto", mContext.cacheDir)
+        tempFile.writeText(jsonAdapter.toJson(userData))
+
+        return@withContext FileProvider.getUriForFile(mContext, auth, tempFile)
+    }
+
+    suspend fun restore(uri: Uri) = withContext(Dispatchers.IO) {
+        val jsonContent = StringBuilder()
+        mContext.contentResolver.openInputStream(uri)?.use { inputStream ->
+            BufferedReader(InputStreamReader(inputStream)).use { reader ->
+                var line: String? = reader.readLine()
+                while (line != null) {
+                    jsonContent.append(line)
+                    line = reader.readLine()
+                }
+            }
+        }
+
+        // Return error
+        val userData: UserData = jsonAdapter.fromJson(jsonContent.toString()) ?: return@withContext IllegalArgumentException("Can't parse: $jsonContent")
+
+        // Apply tables
+        updateUnitsTable(userData)
+        updateTimeZonesTable(userData)
+
+        // Apply datastore prefs
+        // Datastore settings are restored at the end, because it will trigger recomposition of the
+        // entire app composable and all jobs in ViewModels will be canceled
+        updateDatastore(userData)
+    }
+
+    internal suspend fun userDataFromApp(): UserData {
+        val data = dataStore.data.first()
+        val unitsTableData = unitsDao.getAllFlow().first()
+        val timeZoneTableData = timeZoneDao.getFavorites().first()
+
+        return UserData(
+            themingMode = data.getThemingMode(),
+            enableDynamicTheme = data.getEnableDynamicTheme(),
+            enableAmoledTheme = data.getEnableAmoledTheme(),
+            customColor = data.getCustomColor(),
+            monetMode = data.getMonetMode(),
+            startingScreen = data.getStartingScreen(),
+            enableToolsExperiment = data.getEnableToolsExperiment(),
+            enableVibrations = data.getEnableVibrations(),
+            middleZero = data.getMiddleZero(),
+            acButton = data.getAcButton(),
+            rpnMode = data.getRpnMode(),
+            precision = data.getDigitsPrecision(),
+            separator = data.getSeparator(),
+            outputFormat = data.getOutputFormat(),
+            radianMode = data.getRadianMode(),
+            partialHistoryView = data.getPartialHistoryView(),
+            clearInputAfterEquals = data.getClearInputAfterEquals(),
+            latestLeftSide = data.getLatestLeftSide(),
+            latestRightSide = data.getLatestRightSide(),
+            shownUnitGroups = data.getShownUnitGroups(),
+            unitConverterFavoritesOnly = data.getUnitConverterFavoritesOnly(),
+            unitConverterFormatTime = data.getUnitConverterFormatTime(),
+            unitConverterSorting = data.getUnitConverterSorting(),
+            unitsTable = unitsTableData,
+            timeZoneTable = timeZoneTableData,
+        )
+    }
+
+    internal suspend fun updateDatastore(userData: UserData) {
+        dataStore.edit { it.clear() }
+        dataStore.edit {
+            it[PrefsKeys.THEMING_MODE] = userData.themingMode
+            it[PrefsKeys.ENABLE_DYNAMIC_THEME] = userData.enableDynamicTheme
+            it[PrefsKeys.ENABLE_AMOLED_THEME] = userData.enableAmoledTheme
+            it[PrefsKeys.CUSTOM_COLOR] = userData.customColor
+            it[PrefsKeys.MONET_MODE] = userData.monetMode
+            it[PrefsKeys.STARTING_SCREEN] = userData.startingScreen
+            it[PrefsKeys.ENABLE_TOOLS_EXPERIMENT] = userData.enableToolsExperiment
+            it[PrefsKeys.ENABLE_VIBRATIONS] = userData.enableVibrations
+            it[PrefsKeys.MIDDLE_ZERO] = userData.middleZero
+            it[PrefsKeys.AC_BUTTON] = userData.acButton
+            it[PrefsKeys.RPN_MODE] = userData.rpnMode
+
+            // FORMATTER
+            it[PrefsKeys.DIGITS_PRECISION] = userData.precision
+            it[PrefsKeys.SEPARATOR] = userData.separator
+            it[PrefsKeys.OUTPUT_FORMAT] = userData.outputFormat
+
+            // CALCULATOR
+            it[PrefsKeys.RADIAN_MODE] = userData.radianMode
+            it[PrefsKeys.PARTIAL_HISTORY_VIEW] = userData.partialHistoryView
+            it[PrefsKeys.CLEAR_INPUT_AFTER_EQUALS] = userData.clearInputAfterEquals
+
+            // UNIT CONVERTER
+            it[PrefsKeys.LATEST_LEFT_SIDE] = userData.latestLeftSide
+            it[PrefsKeys.LATEST_RIGHT_SIDE] = userData.latestRightSide
+            it[PrefsKeys.SHOWN_UNIT_GROUPS] = userData.shownUnitGroups.joinToString(",")
+            it[PrefsKeys.UNIT_CONVERTER_FAVORITES_ONLY] = userData.unitConverterFavoritesOnly
+            it[PrefsKeys.UNIT_CONVERTER_FORMAT_TIME] = userData.unitConverterFormatTime
+            it[PrefsKeys.UNIT_CONVERTER_SORTING] = userData.unitConverterSorting.name
+        }
+    }
+
+    internal suspend fun updateUnitsTable(userData: UserData) {
+        unitsDao.clear()
+        userData.unitsTable.forEach { unitsDao.insertUnit(it) }
+    }
+
+    internal suspend fun updateTimeZonesTable(userData: UserData) {
+        timeZoneDao.clear()
+        userData.timeZoneTable.forEach { timeZoneDao.insert(it) }
+    }
+}

data/backup/src/main/java/com/sadellie/unitto/data/backup/UserData.kt

@@ -0,0 +1,57 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.backup
+
+import com.sadellie.unitto.data.database.TimeZoneEntity
+import com.sadellie.unitto.data.database.UnitsEntity
+import com.sadellie.unitto.data.model.UnitGroup
+import com.sadellie.unitto.data.model.UnitsListSorting
+
+// Don't move to model module. This uses entity classes from database module
+data class UserData(
+    val themingMode: String,
+    val enableDynamicTheme: Boolean,
+    val enableAmoledTheme: Boolean,
+    val customColor: Long,
+    val monetMode: String,
+    val startingScreen: String,
+    val enableToolsExperiment: Boolean,
+    val enableVibrations: Boolean,
+    val middleZero: Boolean,
+    val acButton: Boolean,
+    val rpnMode: Boolean,
+
+    val precision: Int,
+    val separator: Int,
+    val outputFormat: Int,
+
+    val radianMode: Boolean,
+    val partialHistoryView: Boolean,
+    val clearInputAfterEquals: Boolean,
+
+    val latestLeftSide: String,
+    val latestRightSide: String,
+    val shownUnitGroups: List<UnitGroup>,
+    val unitConverterFavoritesOnly: Boolean,
+    val unitConverterFormatTime: Boolean,
+    val unitConverterSorting: UnitsListSorting,
+
+    val unitsTable: List<UnitsEntity>,
+    val timeZoneTable: List<TimeZoneEntity>,
+)

data/backup/src/main/res/xml/file_provider_path.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Unitto is a unit converter for Android
+  ~ Copyright (c) 2023 Elshan Agaev
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ (at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<paths>
+    <cache-path name="cache" path="."/>
+</paths>

data/database/src/main/java/com/sadellie/unitto/data/database/TimeZoneDao.kt

@@ -74,4 +74,7 @@ interface TimeZoneDao {
         }
         updateDragged(id, 0, targetPosition)
     }
+
+    @Query("DELETE FROM time_zones")
+    suspend fun clear()
 }

data/database/src/main/java/com/sadellie/unitto/data/database/UnitsDao.kt

@@ -35,4 +35,7 @@ interface UnitsDao {
 
     @Query("SELECT * FROM units WHERE unitId == :unitId LIMIT 1")
     suspend fun getById(unitId: String): UnitsEntity?
+
+    @Query("DELETE FROM units")
+    suspend fun clear()
 }

data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceExt.kt

@@ -0,0 +1,135 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.userprefs
+
+import androidx.datastore.preferences.core.Preferences
+import com.sadellie.unitto.core.base.OutputFormat
+import com.sadellie.unitto.core.base.Separator
+import com.sadellie.unitto.core.base.TopLevelDestinations
+import com.sadellie.unitto.data.model.ALL_UNIT_GROUPS
+import com.sadellie.unitto.data.model.UnitGroup
+import com.sadellie.unitto.data.model.UnitsListSorting
+import com.sadellie.unitto.data.units.MyUnitIDS
+
+fun Preferences.getEnableDynamicTheme(): Boolean {
+    return this[PrefsKeys.ENABLE_DYNAMIC_THEME] ?: true
+}
+
+fun Preferences.getThemingMode(): String {
+    return this[PrefsKeys.THEMING_MODE] ?: ""
+}
+
+fun Preferences.getEnableAmoledTheme(): Boolean {
+    return this[PrefsKeys.ENABLE_AMOLED_THEME] ?: false
+}
+
+fun Preferences.getCustomColor(): Long {
+    return this[PrefsKeys.CUSTOM_COLOR] ?: 16L // From Color.Unspecified
+}
+
+fun Preferences.getMonetMode(): String {
+    return this[PrefsKeys.MONET_MODE] ?: ""
+}
+
+fun Preferences.getStartingScreen(): String {
+    return this[PrefsKeys.STARTING_SCREEN] ?: TopLevelDestinations.Calculator.graph
+}
+
+fun Preferences.getEnableToolsExperiment(): Boolean {
+    return this[PrefsKeys.ENABLE_TOOLS_EXPERIMENT] ?: false
+}
+
+fun Preferences.getEnableVibrations(): Boolean {
+    return this[PrefsKeys.ENABLE_VIBRATIONS] ?: true
+}
+
+fun Preferences.getRadianMode(): Boolean {
+    return this[PrefsKeys.RADIAN_MODE] ?: true
+}
+
+fun Preferences.getSeparator(): Int {
+    return this[PrefsKeys.SEPARATOR] ?: Separator.SPACE
+}
+
+fun Preferences.getMiddleZero(): Boolean {
+    return this[PrefsKeys.MIDDLE_ZERO] ?: true
+}
+
+fun Preferences.getPartialHistoryView(): Boolean {
+    return this[PrefsKeys.PARTIAL_HISTORY_VIEW] ?: true
+}
+
+fun Preferences.getDigitsPrecision(): Int {
+    return this[PrefsKeys.DIGITS_PRECISION] ?: 3
+}
+
+fun Preferences.getOutputFormat(): Int {
+    return this[PrefsKeys.OUTPUT_FORMAT] ?: OutputFormat.PLAIN
+}
+
+fun Preferences.getUnitConverterFormatTime(): Boolean {
+    return this[PrefsKeys.UNIT_CONVERTER_FORMAT_TIME] ?: false
+}
+
+fun Preferences.getUnitConverterSorting(): UnitsListSorting {
+    return this[PrefsKeys.UNIT_CONVERTER_SORTING]
+        ?.let { UnitsListSorting.valueOf(it) } ?: UnitsListSorting.USAGE
+}
+
+fun Preferences.getShownUnitGroups(): List<UnitGroup> {
+    return this[PrefsKeys.SHOWN_UNIT_GROUPS]
+        ?.letTryOrNull { list ->
+            list
+                .ifEmpty { return@letTryOrNull listOf() }
+                .split(",")
+                .map { UnitGroup.valueOf(it) }
+        }
+        ?: ALL_UNIT_GROUPS
+}
+
+fun Preferences.getUnitConverterFavoritesOnly(): Boolean {
+    return this[PrefsKeys.UNIT_CONVERTER_FAVORITES_ONLY]
+        ?: false
+}
+
+fun Preferences.getLatestLeftSide(): String {
+    return this[PrefsKeys.LATEST_LEFT_SIDE] ?: MyUnitIDS.kilometer
+}
+
+fun Preferences.getLatestRightSide(): String {
+    return this[PrefsKeys.LATEST_RIGHT_SIDE] ?: MyUnitIDS.mile
+}
+
+fun Preferences.getAcButton(): Boolean {
+    return this[PrefsKeys.AC_BUTTON] ?: true
+}
+
+fun Preferences.getClearInputAfterEquals(): Boolean {
+    return this[PrefsKeys.CLEAR_INPUT_AFTER_EQUALS] ?: true
+}
+
+fun Preferences.getRpnMode(): Boolean {
+    return this[PrefsKeys.RPN_MODE] ?: false
+}
+
+private inline fun <T, R> T.letTryOrNull(block: (T) -> R): R? = try {
+    this?.let(block)
+} catch (e: Exception) {
+    null
+}

data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PrefsKeys.kt

@@ -23,7 +23,7 @@ import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.core.longPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 
-internal object PrefsKeys {
+object PrefsKeys {
     // COMMON
     val THEMING_MODE = stringPreferencesKey("THEMING_MODE_PREF_KEY")
     val ENABLE_DYNAMIC_THEME = booleanPreferencesKey("ENABLE_DYNAMIC_THEME_PREF_KEY")

data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/UserPreferences.kt

@@ -22,10 +22,6 @@ import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.emptyPreferences
-import com.sadellie.unitto.core.base.OutputFormat
-import com.sadellie.unitto.core.base.Separator
-import com.sadellie.unitto.core.base.TopLevelDestinations
-import com.sadellie.unitto.data.model.ALL_UNIT_GROUPS
 import com.sadellie.unitto.data.model.UnitGroup
 import com.sadellie.unitto.data.model.UnitsListSorting
 import com.sadellie.unitto.data.model.repository.UserPreferencesRepository
@@ -40,7 +36,6 @@ import com.sadellie.unitto.data.model.userprefs.FormattingPreferences
 import com.sadellie.unitto.data.model.userprefs.GeneralPreferences
 import com.sadellie.unitto.data.model.userprefs.StartingScreenPreferences
 import com.sadellie.unitto.data.model.userprefs.UnitGroupsPreferences
-import com.sadellie.unitto.data.units.MyUnitIDS
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.map
@@ -287,107 +282,3 @@ class UserPreferencesRepositoryImpl @Inject constructor(
         }
     }
 }
-
-private fun Preferences.getEnableDynamicTheme(): Boolean {
-    return this[PrefsKeys.ENABLE_DYNAMIC_THEME] ?: true
-}
-
-private fun Preferences.getThemingMode(): String {
-    return this[PrefsKeys.THEMING_MODE] ?: ""
-}
-
-private fun Preferences.getEnableAmoledTheme(): Boolean {
-    return this[PrefsKeys.ENABLE_AMOLED_THEME] ?: false
-}
-
-private fun Preferences.getCustomColor(): Long {
-    return this[PrefsKeys.CUSTOM_COLOR] ?: 16L // From Color.Unspecified
-}
-
-private fun Preferences.getMonetMode(): String {
-    return this[PrefsKeys.MONET_MODE] ?: ""
-}
-
-private fun Preferences.getStartingScreen(): String {
-    return this[PrefsKeys.STARTING_SCREEN]
-        ?: TopLevelDestinations.Calculator.graph
-}
-
-private fun Preferences.getEnableToolsExperiment(): Boolean {
-    return this[PrefsKeys.ENABLE_TOOLS_EXPERIMENT] ?: false
-}
-
-private fun Preferences.getEnableVibrations(): Boolean {
-    return this[PrefsKeys.ENABLE_VIBRATIONS] ?: true
-}
-
-private fun Preferences.getRadianMode(): Boolean {
-    return this[PrefsKeys.RADIAN_MODE] ?: true
-}
-
-private fun Preferences.getSeparator(): Int {
-    return this[PrefsKeys.SEPARATOR] ?: Separator.SPACE
-}
-
-private fun Preferences.getMiddleZero(): Boolean {
-    return this[PrefsKeys.MIDDLE_ZERO] ?: true
-}
-
-private fun Preferences.getPartialHistoryView(): Boolean {
-    return this[PrefsKeys.PARTIAL_HISTORY_VIEW] ?: true
-}
-
-private fun Preferences.getDigitsPrecision(): Int {
-    return this[PrefsKeys.DIGITS_PRECISION] ?: 3
-}
-
-private fun Preferences.getOutputFormat(): Int {
-    return this[PrefsKeys.OUTPUT_FORMAT] ?: OutputFormat.PLAIN
-}
-
-private fun Preferences.getUnitConverterFormatTime(): Boolean {
-    return this[PrefsKeys.UNIT_CONVERTER_FORMAT_TIME] ?: false
-}
-
-private fun Preferences.getUnitConverterSorting(): UnitsListSorting {
-    return this[PrefsKeys.UNIT_CONVERTER_SORTING]
-        ?.let { UnitsListSorting.valueOf(it) } ?: UnitsListSorting.USAGE
-}
-
-private fun Preferences.getShownUnitGroups(): List<UnitGroup> {
-    return this[PrefsKeys.SHOWN_UNIT_GROUPS]?.letTryOrNull { list ->
-        list.ifEmpty { return@letTryOrNull listOf() }.split(",")
-            .map { UnitGroup.valueOf(it) }
-    } ?: ALL_UNIT_GROUPS
-}
-
-private fun Preferences.getUnitConverterFavoritesOnly(): Boolean {
-    return this[PrefsKeys.UNIT_CONVERTER_FAVORITES_ONLY]
-        ?: false
-}
-
-private fun Preferences.getLatestLeftSide(): String {
-    return this[PrefsKeys.LATEST_LEFT_SIDE] ?: MyUnitIDS.kilometer
-}
-
-private fun Preferences.getLatestRightSide(): String {
-    return this[PrefsKeys.LATEST_RIGHT_SIDE] ?: MyUnitIDS.mile
-}
-
-private fun Preferences.getAcButton(): Boolean {
-    return this[PrefsKeys.AC_BUTTON] ?: true
-}
-
-private fun Preferences.getClearInputAfterEquals(): Boolean {
-    return this[PrefsKeys.CLEAR_INPUT_AFTER_EQUALS] ?: true
-}
-
-private fun Preferences.getRpnMode(): Boolean {
-    return this[PrefsKeys.RPN_MODE] ?: false
-}
-
-private inline fun <T, R> T.letTryOrNull(block: (T) -> R): R? = try {
-    this?.let(block)
-} catch (e: Exception) {
-    null
-}

feature/settings/build.gradle.kts

@@ -33,6 +33,7 @@ dependencies {
     implementation(libs.org.burnoutcrew.composereorderable.reorderable)
     implementation(libs.androidx.appcompat.appcompat)
 
+    implementation(project(":data:backup"))
     implementation(project(":data:common"))
     implementation(project(":data:database"))
     implementation(project(":data:model"))

feature/settings/src/main/java/com/sadellie/unitto/feature/settings/SettingsScreen.kt

@@ -18,12 +18,21 @@
 
 package com.sadellie.unitto.feature.settings
 
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.widget.Toast
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.Crossfade
 import androidx.compose.animation.expandVertically
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
@@ -34,16 +43,27 @@ import androidx.compose.material.icons.filled.Cached
 import androidx.compose.material.icons.filled.Calculate
 import androidx.compose.material.icons.filled.Home
 import androidx.compose.material.icons.filled.Info
+import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material.icons.filled.Palette
 import androidx.compose.material.icons.filled.RateReview
 import androidx.compose.material.icons.filled.SwapHoriz
 import androidx.compose.material.icons.filled.Vibration
 import androidx.compose.material.icons.filled._123
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
@@ -59,8 +79,6 @@ import com.sadellie.unitto.core.ui.common.UnittoListItem
 import com.sadellie.unitto.core.ui.common.UnittoScreenWithLargeTopBar
 import com.sadellie.unitto.core.ui.openLink
 import com.sadellie.unitto.core.ui.showToast
-import com.sadellie.unitto.data.model.userprefs.GeneralPreferences
-import com.sadellie.unitto.data.userprefs.GeneralPreferencesImpl
 import com.sadellie.unitto.feature.settings.navigation.aboutRoute
 import com.sadellie.unitto.feature.settings.navigation.calculatorSettingsRoute
 import com.sadellie.unitto.feature.settings.navigation.converterSettingsRoute
@@ -74,38 +92,99 @@ internal fun SettingsRoute(
     navigateUp: () -> Unit,
     navControllerAction: (String) -> Unit,
 ) {
-    val userPrefs = viewModel.userPrefs.collectAsStateWithLifecycle().value
-    val cachePercentage = viewModel.cachePercentage.collectAsStateWithLifecycle()
+    val mContext = LocalContext.current
 
-    when (userPrefs) {
-        null -> UnittoEmptyScreen()
-        else -> {
-            SettingsScreen(
-                userPrefs = userPrefs,
+    val errorLabel = stringResource(R.string.error_label)
+
+    val uiState: SettingsUIState = viewModel.uiState.collectAsStateWithLifecycle().value
+    val backupFileUri: Uri? = viewModel.backupFileUri.collectAsStateWithLifecycle(initialValue = null).value
+    val showErrorToast: Boolean = viewModel.showErrorToast.collectAsStateWithLifecycle(initialValue = false).value
+
+    // Share backup file when it's emitted
+    LaunchedEffect(backupFileUri) {
+        if (backupFileUri == null) return@LaunchedEffect
+        mContext.share(backupFileUri)
+    }
+
+    LaunchedEffect(showErrorToast) {
+        if (showErrorToast) Toast.makeText(mContext, errorLabel, Toast.LENGTH_SHORT).show()
+    }
+
+    Crossfade(targetState = uiState) { state ->
+        when (state) {
+            SettingsUIState.Loading -> UnittoEmptyScreen()
+
+            SettingsUIState.BackupInProgress -> BackingUpScreen()
+
+            is SettingsUIState.Ready -> SettingsScreen(
+                uiState = state,
                 navigateUp = navigateUp,
                 navControllerAction = navControllerAction,
                 updateVibrations = viewModel::updateVibrations,
-                cachePercentage = cachePercentage.value,
                 clearCache = viewModel::clearCache,
+                backup =  viewModel::backup,
+                restore = viewModel::restore
             )
         }
     }
 }
 
+@Composable
+private fun BackingUpScreen() {
+    Scaffold { padding ->
+        Box(
+            modifier = Modifier
+                .padding(padding)
+                .fillMaxSize(),
+            contentAlignment = Alignment.Center,
+        ) {
+            CircularProgressIndicator()
+        }
+    }
+
+    BackHandler {}
+}
+
 @Composable
 private fun SettingsScreen(
-    userPrefs: GeneralPreferences,
+    uiState: SettingsUIState.Ready,
     navigateUp: () -> Unit,
     navControllerAction: (String) -> Unit,
     updateVibrations: (Boolean) -> Unit,
-    cachePercentage: Float,
     clearCache: () -> Unit,
+    backup: () -> Unit,
+    restore: (Uri) -> Unit = {},
 ) {
     val mContext = LocalContext.current
+    var showMenu by remember { mutableStateOf(false) }
+
+    // Pass picked file uri to BackupManager
+    val launcher = rememberLauncherForActivityResult(ActivityResultContracts.OpenDocument()) { pickedUri ->
+        if (pickedUri != null) restore(pickedUri)
+    }
 
     UnittoScreenWithLargeTopBar(
         title = stringResource(R.string.settings_title),
-        navigationIcon = { NavigateUpButton(navigateUp) }
+        navigationIcon = { NavigateUpButton(navigateUp) },
+        actions = {
+            IconButton(
+                onClick = { showMenu = !showMenu },
+                content = { Icon(Icons.Default.MoreVert, null) }
+            )
+            DropdownMenu(
+                expanded = showMenu,
+                onDismissRequest = { showMenu = false }
+            ) {
+                DropdownMenuItem(
+                    onClick = backup,
+                    text = { Text("Backup") }
+                )
+                DropdownMenuItem(
+                    onClick = { launcher.launch(arrayOf(backupMimeType)) },
+                    text = { Text("Restore") }
+                )
+            }
+        }
     ) { padding ->
         Column(
             modifier = Modifier
@@ -155,12 +234,12 @@ private fun SettingsScreen(
                 headlineText = stringResource(R.string.settings_vibrations),
                 supportingText = stringResource(R.string.settings_vibrations_support),
                 modifier = Modifier.clickable { navControllerAction(converterSettingsRoute) },
-                switchState = userPrefs.enableVibrations,
+                switchState = uiState.enableVibrations,
                 onSwitchChange = updateVibrations
             )
 
             AnimatedVisibility(
-                visible = cachePercentage > 0,
+                visible = uiState.cacheSize > 0,
                 enter = expandVertically() + fadeIn(),
                 exit = shrinkVertically() + fadeOut(),
             ) {
@@ -189,19 +268,38 @@ private fun SettingsScreen(
     }
 }
 
+private fun Context.share(uri: Uri) {
+    val shareIntent = Intent().apply {
+        action = Intent.ACTION_SEND
+        putExtra(Intent.EXTRA_STREAM, uri)
+        type = backupMimeType // This is a fucking war crime, it should be text/json
+    }
+
+    startActivity(shareIntent)
+}
+
+private const val backupMimeType = "application/octet-stream"
+
 @Preview
 @Composable
 private fun PreviewSettingsScreen() {
     var cacheSize by remember { mutableFloatStateOf(0.9f) }
 
     SettingsScreen(
-        userPrefs = GeneralPreferencesImpl(
-            enableVibrations = true
+        uiState = SettingsUIState.Ready(
+            enableVibrations = false,
+            cacheSize = 2,
         ),
         navigateUp = {},
         navControllerAction = {},
         updateVibrations = {},
-        cachePercentage = cacheSize,
-        clearCache = { cacheSize = 0f }
+        clearCache = { cacheSize = 0f },
+        backup = {}
     )
 }
+
+@Preview
+@Composable
+private fun PreviewBackingUpScreen() {
+    BackingUpScreen()
+}

feature/settings/src/main/java/com/sadellie/unitto/feature/settings/SettingsUIState.kt

@@ -0,0 +1,30 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.feature.settings
+
+internal sealed class SettingsUIState {
+    data object Loading : SettingsUIState()
+
+    data object BackupInProgress : SettingsUIState()
+
+    data class Ready(
+        val enableVibrations: Boolean,
+        val cacheSize: Int,
+    ) : SettingsUIState()
+}

feature/settings/src/main/java/com/sadellie/unitto/feature/settings/SettingsViewModel.kt

@@ -18,14 +18,22 @@
 
 package com.sadellie.unitto.feature.settings
 
+import android.net.Uri
+import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.sadellie.unitto.data.backup.BackupManager
 import com.sadellie.unitto.data.common.stateIn
 import com.sadellie.unitto.data.database.CurrencyRatesDao
 import com.sadellie.unitto.data.model.repository.UserPreferencesRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -33,15 +41,61 @@ import javax.inject.Inject
 internal class SettingsViewModel @Inject constructor(
     private val userPrefsRepository: UserPreferencesRepository,
     private val currencyRatesDao: CurrencyRatesDao,
+    private val backupManager: BackupManager
 ) : ViewModel() {
-    val userPrefs = userPrefsRepository.generalPrefs
-        .stateIn(viewModelScope, null)
+    private val _backupFileUri = MutableSharedFlow<Uri?>()
+    val backupFileUri = _backupFileUri.asSharedFlow()
 
-    val cachePercentage = currencyRatesDao.size()
-        .map {
-            (it / 100_000f).coerceIn(0f, 1f)
+    private val _showErrorToast = MutableSharedFlow<Boolean>()
+    val showErrorToast = _showErrorToast.asSharedFlow()
+
+    private val _operation = MutableStateFlow(false)
+    private var backupJob: Job? = null
+
+    val uiState = combine(
+        userPrefsRepository.generalPrefs,
+        currencyRatesDao.size(),
+        _operation,
+    ) { prefs, cacheSize, operation ->
+        if (operation) return@combine SettingsUIState.BackupInProgress
+
+        SettingsUIState.Ready(
+            enableVibrations = prefs.enableVibrations,
+            cacheSize = cacheSize,
+        )
+    }
+        .stateIn(viewModelScope, SettingsUIState.Loading)
+
+    fun backup() {
+        backupJob?.cancel()
+        backupJob = viewModelScope.launch(Dispatchers.IO) {
+            _operation.update { true }
+            try {
+                val backupFileUri = backupManager.backup()
+                _backupFileUri.emit(backupFileUri) // Emit to trigger file share intent
+                _showErrorToast.emit(false)
+            } catch (e: Exception) {
+                _showErrorToast.emit(true)
+                Log.e(TAG, "$e")
+            }
+            _operation.update { false }
+        }
+    }
+
+    fun restore(uri: Uri) {
+        backupJob?.cancel()
+        backupJob = viewModelScope.launch(Dispatchers.IO) {
+            _operation.update { true }
+            try {
+                backupManager.restore(uri)
+                _showErrorToast.emit(false)
+            } catch (e: Exception) {
+                _showErrorToast.emit(true)
+                Log.e(TAG, "$e")
+            }
+            _operation.update { false }
+        }
     }
-        .stateIn(viewModelScope, 0f)
 
     /**
      * @see UserPreferencesRepository.updateVibrations
@@ -54,3 +108,5 @@ internal class SettingsViewModel @Inject constructor(
         currencyRatesDao.clear()
     }
 }
+
+private const val TAG = "SettingsViewModel"

settings.gradle.kts

@@ -34,3 +34,4 @@ include(":data:model")
 include(":data:common")
 include(":data:evaluatto")
 include(":data:timezone")
+include(":data:backup")