fix: add priority field to message and sorting by priority within local store

messaginginapp/src/main/java/io/customer/messaginginapp/gist/data/listeners/Queue.kt

@@ -35,20 +35,20 @@
     private val cache by lazy { Cache(cacheDirectory, cacheSize.toLong()) }
 
     private fun saveToPrefs(context: Context, key: String, value: String) {
         val prefs = context.getSharedPreferences("network_cache", Context.MODE_PRIVATE)
         prefs.edit().putString(key, value).apply()
     }
 
     private fun getFromPrefs(context: Context, key: String): String? {
         val prefs = context.getSharedPreferences("network_cache", Context.MODE_PRIVATE)
         return prefs.getString(key, null)
     }
 
     private val gistQueueService by lazy {
         // Interceptor to set up request headers like site ID, data center, and user token.
         val httpClient: OkHttpClient =
             OkHttpClient.Builder().cache(cache)
                 .addInterceptor { chain ->
                     val originalRequest = chain.request()
 
                     val networkRequest = originalRequest.newBuilder()
@@ -97,7 +97,7 @@
 
                     response
                 }
                 .build()
 
         Retrofit.Builder()
             .baseUrl(GistSdk.gistEnvironment.getGistQueueApiUrl())
@@ -116,7 +116,7 @@
     }
 
     internal fun fetchUserMessages() {
         GlobalScope.launch {
             try {
                 Log.i(GIST_TAG, "Fetching user messages")
                 val latestMessagesResponse = gistQueueService.fetchMessagesForUser()
@@ -143,7 +143,9 @@
     }
 
     private fun handleMessages(messages: List<Message>) {
-        for (message in messages) {
+        // Sorting messages by priority and placing nulls last.
+        val sortedMessages = messages.sortedWith(compareBy(nullsLast()) { it.priority })
+        for (message in sortedMessages) {
             processMessage(message)
         }
     }

messaginginapp/src/main/java/io/customer/messaginginapp/gist/data/model/Message.kt

@@ -18,6 +18,7 @@ data class GistProperties(
 data class Message(
     val messageId: String = "",
     val instanceId: String = UUID.randomUUID().toString(),
+    val priority: Int? = null,
     val queueId: String? = null,
     val properties: Map<String, Any?>? = null
 )