refactor: create language model

app/src/main/java/ua/acclorite/book_story/core/data/CoreData.kt

@@ -6,28 +6,29 @@
 
 package ua.acclorite.book_story.core.data
 
-import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toPersistentList
+import ua.acclorite.book_story.core.model.Language
 
 object CoreData {
-    val languages = persistentListOf(
+    val defaultLanguage = Language.fromCode(code = "en")
-        Pair("en", "English"),
+    val languages = listOf(
-        Pair("uk", "Українська"),
+        Language.fromCode(code = "en"),
-        Pair("de", "Deutsch"),
+        Language.fromCode(code = "uk"),
-        Pair("ar", "اَلْعَرَبِيَّةُ"),
+        Language.fromCode(code = "de"),
-        Pair("es", "Español"),
+        Language.fromCode(code = "ar"),
-        Pair("tr", "Türkçe"),
+        Language.fromCode(code = "es"),
-        Pair("fr", "Français"),
+        Language.fromCode(code = "tr"),
-        Pair("pl", "Polski"),
+        Language.fromCode(code = "fr"),
-        Pair("it", "Italiano"),
+        Language.fromCode(code = "pl"),
-        Pair("zh", "汉语"),
+        Language.fromCode(code = "it"),
-        Pair("hi", "हिन्दी"),
+        Language.fromCode(code = "zh"),
-        // Currently as "pt" (which is Portuguese) instead of "pt-BR"
+        Language.fromCode(code = "hi"),
-        Pair("pt", "Português (Brasil)"),
+        Language.fromCode(code = "pt", displayName = "pt-BR"),
-        Pair("ta", "தமிழ்"),
+        Language.fromCode(code = "ta"),
-        Pair("ml", "മലയാളം"),
+        Language.fromCode(code = "ml"),
-        Pair("cs", "Čeština"),
+        Language.fromCode(code = "cs"),
-        Pair("ro", "Română"),
+        Language.fromCode(code = "ro"),
-        Pair("be", "Беларуская"),
+        Language.fromCode(code = "be"),
-        Pair("ja", "日本語")
+        Language.fromCode(code = "ja"),
-    )
+    ).sortedBy { it.displayName }.toPersistentList()
 }

app/src/main/java/ua/acclorite/book_story/core/model/Language.kt

@@ -0,0 +1,24 @@
+/*
+ * Book's Story — free and open-source Material You eBook reader.
+ * Copyright (C) 2024-2025 Acclorite
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package ua.acclorite.book_story.core.model
+
+import androidx.compose.runtime.Immutable
+
+@Immutable
+data class Language(
+    val languageCode: LanguageCode,
+    val displayName: String
+) {
+    companion object {
+        fun fromCode(code: String, displayName: String = code): Language {
+            return Language(
+                languageCode = LanguageCode(code = code),
+                displayName = LanguageCode.getDisplayName(code = displayName)
+            )
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/core/model/LanguageCode.kt

@@ -0,0 +1,22 @@
+/*
+ * Book's Story — free and open-source Material You eBook reader.
+ * Copyright (C) 2024-2025 Acclorite
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package ua.acclorite.book_story.core.model
+
+import androidx.compose.runtime.Immutable
+import java.util.Locale
+
+@Immutable
+@JvmInline
+value class LanguageCode(val code: String) {
+    companion object {
+        fun getDisplayName(code: String): String {
+            val target = Locale.forLanguageTag(code)
+            val displayName = target.getDisplayName(target)
+            return displayName.replaceFirstChar { it.uppercaseChar() }
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/data/settings/SettingsManager.kt

@@ -21,6 +21,7 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import ua.acclorite.book_story.core.data.CoreData
 import ua.acclorite.book_story.core.log.logI
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.data.local.data_store.DataStore
 import ua.acclorite.book_story.data.settings.model.Setting
 import ua.acclorite.book_story.presentation.browse.model.BrowseLayout
@@ -62,15 +63,19 @@ class SettingsManager @Inject constructor(
 
     /* ------ Settings --------------------------- */
     /* ------ General ---------------------------- */
-    val language = setting<String, String>(
+    val language =
-        key = stringPreferencesKey("language"),
+        setting<Language, String>(
-        default = Locale.getDefault().language.take(2).let { locale ->
+            key = stringPreferencesKey("language"),
-            CoreData.languages.any { locale == it.first }.run {
+            default = Locale.getDefault().language.take(2).let { defaultLocale ->
-                if (this) locale
+                CoreData.languages.find { locale -> locale.languageCode.code == defaultLocale }
-                else "en"// Default language (English)
+                    ?: CoreData.defaultLanguage
+            },
+            serialize = { it.languageCode.code },
+            deserialize = { code ->
+                CoreData.languages.find { locale -> locale.languageCode.code == code }
+                    ?: CoreData.defaultLanguage
             }
-        }
+        )
-    )
     val theme = setting<Theme, String>(
         key = stringPreferencesKey("theme"), default = Theme.Companion.entries().first(),
         serialize = { it.name }, deserialize = { Theme.valueOf(it) }

app/src/main/java/ua/acclorite/book_story/domain/use_case/settings/UpdateLanguageUseCase.kt

@@ -8,6 +8,7 @@ package ua.acclorite.book_story.domain.use_case.settings
 
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.os.LocaleListCompat
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.data.settings.SettingsManager
 import javax.inject.Inject
 
@@ -15,8 +16,8 @@ class UpdateLanguageUseCase @Inject constructor(
     private val settings: SettingsManager
 ) {
 
-    operator fun invoke(language: String) {
+    operator fun invoke(language: Language) {
-        val appLocale = LocaleListCompat.forLanguageTags(language)
+        val appLocale = LocaleListCompat.forLanguageTags(language.languageCode.code)
         AppCompatDelegate.setApplicationLocales(appLocale)
         settings.language.update(language)
     }

app/src/main/java/ua/acclorite/book_story/presentation/settings/SettingsEvent.kt

@@ -11,13 +11,14 @@ import android.net.Uri
 import androidx.compose.runtime.Immutable
 import androidx.compose.ui.graphics.Color
 import ua.acclorite.book_story.core.ID
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.domain.model.library.Category
 import ua.acclorite.book_story.presentation.library.model.LibrarySortOrder
 
 @Immutable
 sealed class SettingsEvent {
     data class OnUpdateLanguage(
-        val language: String
+        val language: Language
     ) : SettingsEvent()
 
     data class OnGrantPersistableUriPermission(

app/src/main/java/ua/acclorite/book_story/presentation/start/StartScreen.kt

@@ -58,13 +58,13 @@ object StartScreen : Screen, Parcelable {
         val stackEvent = remember { mutableStateOf(StackEvent.DEFAULT) }
 
         val languages = remember(settings.language.value) {
-            CoreData.languages.sortedBy { it.second }.map {
+            CoreData.languages.map { item ->
                 ListItem(
-                    item = it.first,
+                    item = item,
-                    title = it.second,
+                    title = item.displayName,
-                    selected = it.first == settings.language.lastValue
+                    selected = item == settings.language.lastValue
                 )
-            }.sortedBy { it.title }
+            }
         }
 
         StartContent(

app/src/main/java/ua/acclorite/book_story/ui/settings/general/components/AppLanguageOption.kt

@@ -24,11 +24,11 @@ fun AppLanguageOption() {
 
     ChipsWithTitle(
         title = stringResource(id = R.string.language_option),
-        chips = CoreData.languages.sortedBy { it.second }.map { item ->
+        chips = CoreData.languages.map { item ->
             ListItem(
-                item = item.first,
+                item = item,
-                title = item.second,
+                title = item.displayName,
-                selected = item.first == settings.language.value
+                selected = item == settings.language.value
             )
         },
         onClick = { item ->

app/src/main/java/ua/acclorite/book_story/ui/start/StartContent.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.background
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.presentation.navigator.StackEvent
 import ua.acclorite.book_story.presentation.start.StartScreen
 import ua.acclorite.book_story.ui.common.model.ListItem
@@ -18,8 +19,8 @@ import ua.acclorite.book_story.ui.common.model.ListItem
 fun StartContent(
     currentPage: Int,
     stackEvent: StackEvent,
-    languages: List<ListItem<String>>,
+    languages: List<ListItem<Language>>,
-    updateLanguage: (String) -> Unit,
+    updateLanguage: (Language) -> Unit,
     navigateForward: () -> Unit,
     navigateBack: () -> Unit,
     navigateToBrowse: () -> Unit,

app/src/main/java/ua/acclorite/book_story/ui/start/StartSettings.kt

@@ -7,6 +7,7 @@
 package ua.acclorite.book_story.ui.start
 
 import androidx.compose.runtime.Composable
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.presentation.navigator.StackEvent
 import ua.acclorite.book_story.presentation.start.StartScreen
 import ua.acclorite.book_story.ui.common.model.ListItem
@@ -15,8 +16,8 @@ import ua.acclorite.book_story.ui.common.model.ListItem
 fun StartSettings(
     currentPage: Int,
     stackEvent: StackEvent,
-    languages: List<ListItem<String>>,
+    languages: List<ListItem<Language>>,
-    updateLanguage: (String) -> Unit,
+    updateLanguage: (Language) -> Unit,
     navigateForward: () -> Unit
 ) {
     StartSettingsScaffold(

app/src/main/java/ua/acclorite/book_story/ui/start/StartSettingsLayoutGeneral.kt

@@ -17,13 +17,14 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import ua.acclorite.book_story.R
+import ua.acclorite.book_story.core.model.Language
 import ua.acclorite.book_story.ui.common.components.dialog.SelectableDialogItem
 import ua.acclorite.book_story.ui.common.model.ListItem
 import ua.acclorite.book_story.ui.settings.components.SettingsSubcategoryTitle
 
 fun LazyListScope.StartSettingsLayoutGeneral(
-    languages: List<ListItem<String>>,
+    languages: List<ListItem<Language>>,
-    updateLanguage: (String) -> Unit,
+    updateLanguage: (Language) -> Unit,
 ) {
     item {
         Spacer(modifier = Modifier.height(16.dp))
@@ -34,13 +35,13 @@ fun LazyListScope.StartSettingsLayoutGeneral(
         Spacer(modifier = Modifier.height(12.dp))
     }
 
-    items(languages, key = { it.item }) {
+    items(languages, key = { it.item }) { item ->
         SelectableDialogItem(
-            selected = it.selected,
+            selected = item.selected,
-            title = it.title,
+            title = item.title,
             horizontalPadding = 18.dp
         ) {
-            updateLanguage(it.item)
+            updateLanguage(item.item)
         }
     }