Version fetching API added

app/src/main/java/org/thoughtcrime/securesms/util/VersionUtil.kt

@@ -0,0 +1,44 @@
+package org.thoughtcrime.securesms.util
+
+import android.content.Context
+import android.os.Handler
+import android.os.Looper
+import org.session.libsession.utilities.TextSecurePreferences
+
+class VersionUtil(
+    private val context: Context,
+    private val prefs: TextSecurePreferences
+) {
+
+    private val handler = Handler(Looper.getMainLooper())
+    private val runnable: Runnable
+
+    init {
+        runnable = Runnable {
+            // Task to be executed every 4 hours
+            fetchVersionData()
+        }
+
+        // Re-schedule the task
+        handler.postDelayed(runnable, FOUR_HOURS)
+    }
+
+    fun startTimedVersionCheck() {
+        handler.post(runnable)
+    }
+
+    fun stopTimedVersionCheck() {
+        handler.removeCallbacks(runnable)
+    }
+
+    private fun fetchVersionData() {
+        // only perform this if at least 4h has elapsed since th last successful check
+        if(prefs.getLastVersionCheck() < FOUR_HOURS) return
+
+
+    }
+
+    companion object {
+        private const val FOUR_HOURS = 4 * 60 * 60 * 1000L // 4 hours in milliseconds
+    }
+}