refactor: rewrite mobile app in Compose and add error handling for wear

mobile/src/main/java/ru/omni_devel/cards/Utils.kt

@@ -2,7 +2,6 @@ package ru.omni_devel.cards
 
 import android.content.Context
 import android.graphics.Bitmap
-import android.widget.Toast
 import com.google.android.gms.wearable.Wearable
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter
@@ -10,16 +9,14 @@ import com.journeyapps.barcodescanner.BarcodeEncoder
 
 fun generateCode(value: String, format: BarcodeFormat): Bitmap {
     val writer = MultiFormatWriter()
-    val matrix = writer.encode(value, format, 600, 300)
+    val matrix = writer.encode(value, format, 800, 400)
 
     return BarcodeEncoder().createBitmap(matrix)
 }
 
-fun sendToWatch(context: Context, path: String, message: String, onResult: (Boolean) -> Unit): Boolean {
+fun sendToWatch(context: Context, path: String, message: String, onResult: (Boolean) -> Unit) {
     val nodeClient = Wearable.getNodeClient(context)
 
-    var isSuccess = false
-
     nodeClient.connectedNodes.addOnSuccessListener { nodes ->
         if (nodes.isEmpty()) {
             onResult(false)
@@ -35,7 +32,7 @@ fun sendToWatch(context: Context, path: String, message: String, onResult: (Bool
                 node.id,
                 path,
                 message.toByteArray(Charsets.UTF_8)
-            ).addOnCompleteListener { task ->
+            ).addOnCompleteListener(context.mainExecutor) { task ->
                 completedCount++
 
                 if (task.isSuccessful) {
@@ -45,11 +42,19 @@ fun sendToWatch(context: Context, path: String, message: String, onResult: (Bool
                 if (completedCount == nodes.size) {
                     onResult(isAnySuccess)
                 }
-            }.addOnFailureListener {
+            }.addOnFailureListener(context.mainExecutor) {
                 onResult(false)
             }
         }
     }
+}
 
-    return isSuccess
+fun checkCardData(name: String, value: String): String? {
+    if (name.trim().isEmpty()) {
+        return "Name should not be empty"
+    } else if (value.trim().isEmpty()) {
+        return "Code value should not be empty"
+    }
+
+    return null
 }