Show changelog after app update

data/src/main/java/com/moez/QKSMS/manager/ChangelogManagerImpl.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
+ *
+ * This file is part of QKSMS.
+ *
+ * QKSMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QKSMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QKSMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.moez.QKSMS.manager
+
+import android.content.Context
+import com.moez.QKSMS.model.SyncLog
+import com.moez.QKSMS.util.Preferences
+import io.realm.Realm
+import javax.inject.Inject
+
+class ChangelogManagerImpl @Inject constructor(
+    private val context: Context,
+    private val prefs: Preferences
+) : ChangelogManager {
+
+    override fun didUpdate(): Boolean {
+        val oldVersion = prefs.version.get()
+        val newVersion = context.packageManager.getPackageInfo(context.packageName, 0).versionCode
+        val lastSync = Realm.getDefaultInstance().use { realm -> realm.where(SyncLog::class.java)?.max("date") ?: 0 }
+
+        if (oldVersion != newVersion) {
+            prefs.version.set(newVersion)
+        }
+
+        return when {
+            oldVersion == 0 && lastSync != 0 -> true // Just updated to 3.6.5. TODO: Remove this after 3.6.5
+            oldVersion == 0 -> false // First install
+            oldVersion != newVersion -> true // Update
+            else -> false
+        }
+    }
+
+}

data/src/main/java/com/moez/QKSMS/util/Preferences.kt

@@ -87,6 +87,7 @@ class Preferences @Inject constructor(private val rxPrefs: RxSharedPreferences)
     val mobileOnly = rxPrefs.getBoolean("mobileOnly", false)
     val mmsSize = rxPrefs.getInteger("mmsSize", 300)
     val logging = rxPrefs.getBoolean("logging", false)
+    val version = rxPrefs.getInteger("version", 0)
 
     fun theme(threadId: Long = 0): Preference<Int> {
         val default = rxPrefs.getInteger("theme", 0xFF0097A7.toInt())