I18n support with statically generated class (#145)

* Add i18n support using java property files.
Not working yet on ios.
Processing of the file content need more work (manual linebreaks not detected yet) and testing.

* Add 2 example usages

* Add type check

* Move resources to common main

* Adjust gradle file to include resources in ios

* Use Properties instead of loading resource as text

* Dont throw if resources not found (for dev)

* Add resources from commonMain to android.
FOr ios its still not working. several attempts are kept in commented out form...

* - fix crash when some mappings are not found/defined & defaulting to english

* cleanups

* Generate class with all resources based on resource files.

Build fails as it seems it does not access the src dir with the generated class correctly.

* Use source dir instead of build dir as on iOS there are issues.
Split files per language.
Add UTF8 support

* - removed dead code

---------

Co-authored-by: Rodrigo Varela <[email protected]>

shared/domain/build.gradle.kts

@@ -1,3 +1,7 @@
+import java.io.InputStreamReader
+import java.util.Properties
+import kotlin.io.path.Path
+
 plugins {
     alias(libs.plugins.kotlinMultiplatform)
     alias(libs.plugins.kotlinCocoapods)
@@ -111,7 +115,7 @@ kotlin {
         }
         androidMain.dependencies {
             implementation(libs.androidx.core)
-            
+
             implementation(libs.koin.core)
             implementation(libs.koin.android)
         }
@@ -149,4 +153,108 @@ android {
         sourceCompatibility = JavaVersion.VERSION_1_8
         targetCompatibility = JavaVersion.VERSION_1_8
     }
+
+    sourceSets["main"].resources.srcDirs("src/commonMain/resources")
+}
+
+tasks.withType<Copy> {
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
+
+// Create a task class to ensure proper serialization for configuration cache compatibility
+abstract class GenerateResourceBundlesTask : DefaultTask() {
+    @get:InputDirectory
+    abstract val inputDir: DirectoryProperty
+
+    @get:OutputDirectory
+    abstract val outputDir: DirectoryProperty
+
+    @TaskAction
+    fun generate() {
+        val resourceDir = inputDir.asFile.get()
+
+        val bundleNames: List<String> = listOf(
+            "default",
+            "application",
+            "bisq_easy",
+            "reputation",
+            "chat",
+            "support",
+            "user",
+            "network",
+            "settings",
+            "payment_method",
+            "offer",
+            "mobile" // custom for mobile client
+        )
+
+        val languageCodes = listOf("en", "af_ZA", "cs", "de", "es", "it", "pcm", "pt_BR", "ru")
+
+        val bundlesByCode: Map<String, List<ResourceBundle>> = languageCodes.associateWith { languageCode ->
+            bundleNames.mapNotNull { bundleName ->
+                val code = if (languageCode.lowercase() == "en") "" else "_$languageCode"
+                val fileName = "$bundleName$code.properties"
+                var file = Path(resourceDir.path, fileName).toFile()
+
+                if (!file.exists()) {
+                    // Fall back to English default properties if no translation file
+                    file = Path(resourceDir.path, "$bundleName.properties").toFile()
+                    if (!file.exists()) {
+                        logger.warn("File not found: ${file.absolutePath}")
+                        return@mapNotNull null // Skip missing files
+                    }
+                }
+
+                val properties = Properties()
+
+                // Use InputStreamReader to ensure UTF-8 encoding
+                file.inputStream().use { inputStream ->
+                    InputStreamReader(inputStream, Charsets.UTF_8).use { reader ->
+                        properties.load(reader)
+                    }
+                }
+
+                val map = properties.entries.associate { it.key.toString() to it.value.toString() }
+                ResourceBundle(map, bundleName, languageCode)
+            }
+        }
+
+        bundlesByCode.forEach { (languageCode, bundles) ->
+            val outputFile: File = outputDir.get().file("GeneratedResourceBundles_$languageCode.kt").asFile
+            val generatedCode = StringBuilder().apply {
+                appendLine("package network.bisq.mobile.i18n")
+                appendLine()
+                appendLine("// Auto-generated file. Do not modify manually.")
+                appendLine("object GeneratedResourceBundles_$languageCode {")
+                appendLine("    val bundles = mapOf(")
+                bundles.forEach { bundle ->
+                    appendLine("        \"${bundle.bundleName}\" to mapOf(")
+                    bundle.map.forEach { (key, value) ->
+                        val escapedValue = value
+                            .replace("\\", "\\\\") // Escape backslashes
+                            .replace("\"", "\\\"") // Escape double quotes
+                            .replace("\n", "\\n") // Escape newlines
+                        appendLine("            \"$key\" to \"$escapedValue\",")
+                    }
+                    appendLine("        ),")
+                }
+                appendLine("    )")
+                appendLine("}")
+            }
+
+            outputFile.parentFile.mkdirs()
+            outputFile.writeText(generatedCode.toString(), Charsets.UTF_8)
+        }
+    }
+
+    data class ResourceBundle(val map: Map<String, String>, val bundleName: String, val languageCode: String)
+}
+
+tasks.register<GenerateResourceBundlesTask>("generateResourceBundles") {
+    group = "build"
+    description = "Generate a Kotlin file with hardcoded ResourceBundle data"
+    inputDir.set(layout.projectDirectory.dir("src/commonMain/resources/mobile"))
+    // Using build dir still not working on iOS
+    // Thus we use the source dir as target
+    outputDir.set(layout.projectDirectory.dir("src/commonMain/kotlin/network/bisq/mobile/i18n"))
 }

shared/domain/src/androidMain/kotlin/network/bisq/mobile/domain/PlatformDomainAbstractions.android.kt

@@ -16,6 +16,10 @@ import kotlinx.serialization.Serializable
 import java.io.ByteArrayOutputStream
 import java.util.Locale
 import java.text.DecimalFormat
+import java.io.IOException
+import java.io.InputStream
+import java.util.Scanner
+import java.util.Properties
 
 actual fun getPlatformSettings(): Settings {
     return Settings()
@@ -39,6 +43,17 @@ class AndroidPlatformInfo : PlatformInfo {
 
 actual fun getPlatformInfo(): PlatformInfo = AndroidPlatformInfo()
 
+
+actual fun loadProperties(fileName: String): Map<String, String> {
+    val properties = Properties()
+    val classLoader = Thread.currentThread().contextClassLoader
+    val resource = classLoader?.getResourceAsStream(fileName)
+        ?: throw IllegalArgumentException("Resource not found: $fileName")
+    properties.load(resource)
+
+    return properties.entries.associate { it.key.toString() to it.value.toString() }
+}
+
 @Serializable(with = PlatformImageSerializer::class)
 actual class PlatformImage(val bitmap: ImageBitmap) {
     actual companion object {

shared/domain/src/commonMain/kotlin/network/bisq/mobile/client/service/bootstrap/ClientApplicationBootstrapFacade.kt

@@ -6,6 +6,7 @@ import network.bisq.mobile.domain.data.BackgroundDispatcher
 import network.bisq.mobile.domain.data.repository.SettingsRepository
 import network.bisq.mobile.domain.service.TrustedNodeService
 import network.bisq.mobile.domain.service.bootstrap.ApplicationBootstrapFacade
+import network.bisq.mobile.i18n.i18n
 
 class ClientApplicationBootstrapFacade(
     private val settingsRepository: SettingsRepository,
@@ -36,15 +37,15 @@ class ClientApplicationBootstrapFacade(
             if (!trustedNodeService.isConnected()) {
                 try {
                     trustedNodeService.connect()
-                    setState("Connected to Trusted Node")
+                    setState("bootstrap.connectedToTrustedNode".i18n())
                     setProgress(1.0f)
                 } catch (e: Exception) {
                     log.e(e) { "Failed to connect to trusted node" }
                     setState("No connectivity")
                     setProgress(1.0f)
                 }
             } else {
-                setState("Connected to Trusted Node")
+                setState("bootstrap.connectedToTrustedNode".i18n())
                 setProgress(1.0f)
             }
 //            }

shared/domain/src/commonMain/kotlin/network/bisq/mobile/domain/PlatformDomainAbstractions.kt

@@ -27,6 +27,8 @@ expect fun getDeviceLanguageCode(): String
 
 expect fun getPlatformInfo(): PlatformInfo
 
+expect fun loadProperties(fileName: String): Map<String, String>
+
 @Serializable(with = PlatformImageSerializer::class)
 expect class PlatformImage {
     companion object {