Moved user logic to the UserManager

app/src/main/java/com/paktalin/vocabularynotebook/UserManager.kt

+package com.paktalin.vocabularynotebook
+
+import android.util.Log
+import com.google.firebase.auth.FirebaseUser
+import com.google.firebase.firestore.FirebaseFirestore
+import com.paktalin.vocabularynotebook.activities.LogInActivity
+import java.util.*
+
+class UserManager {
+    companion object {
+        private val TAG = "VN/" + UserManager::class.simpleName
+
+        private fun deleteUser(user: FirebaseUser) {
+            user.delete()
+                    .addOnSuccessListener { Log.i(TAG, "UserPojo was successfully deleted") }
+                    .addOnFailureListener { Log.i(TAG, "deleteUser:failure", it.cause)}
+        }
+
+        fun addNewUserToDb(newUser: FirebaseUser, logInActivity: LogInActivity) {
+            //todo add condition to writing to the db in Firebase Console (request.auth.uid)
+            val db = FirebaseFirestore.getInstance()
+            val user = UserPojo(newUser.email)
+
+            db.collection("vocabularies").add(VocabularyPojo())
+                    .addOnSuccessListener { firstVocabularyRef ->
+                        Log.d(TAG, "VocabularyPojo successfully created: " + firstVocabularyRef.path)
+                        user.vocabularies = Collections.singletonList(firstVocabularyRef)
+
+                        db.collection("users").document(newUser.uid).set(user)
+                                .addOnCompleteListener({ task ->
+                                    if (task.isSuccessful) {
+                                        Log.i(TAG, "Successfully added user to the collection")
+                                        logInActivity.startUserActivity()
+                                    }
+                                    else Log.w(TAG, "addUser:failure", task.exception)
+                                })
+                    }
+                    .addOnFailureListener {
+                        Log.w(TAG, "Couldn't add user to the database", it.cause)
+                        UserManager.deleteUser(newUser)
+                    }
+        }
+    }
+}

app/src/main/java/com/paktalin/vocabularynotebook/User.java → app/src/main/java/com/paktalin/vocabularynotebook/UserPojo.java

@@ -4,13 +4,13 @@ package com.paktalin.vocabularynotebook;
 import com.google.firebase.firestore.DocumentReference;
 import java.util.List;
 
-public class User {
-    private final static String TAG = "VN/" + User.class.getSimpleName();
+public class UserPojo {
+    private final static String TAG = "VN/" + UserPojo.class.getSimpleName();
 
     private String email, name;
     private List<DocumentReference> vocabularies;
 
-    public User(String email) {
+    public UserPojo(String email) {
         this.email = email;
     }
 

app/src/main/java/com/paktalin/vocabularynotebook/Vocabulary.java → app/src/main/java/com/paktalin/vocabularynotebook/VocabularyPojo.java

 package com.paktalin.vocabularynotebook;
 
-public class Vocabulary {
+public class VocabularyPojo {
 
     String title;
 
-    public Vocabulary() {
+    public VocabularyPojo() {
         title = "First vocabulary";
     }
 

app/src/main/java/com/paktalin/vocabularynotebook/activities/LogInActivity.kt

@@ -7,16 +7,11 @@ import android.os.Bundle
 import android.text.TextUtils
 import android.util.Log
 import android.widget.Toast
-import com.google.android.gms.signin.SignIn
 
 import com.google.firebase.auth.FirebaseAuth
-import com.google.firebase.auth.FirebaseUser
 import kotlinx.android.synthetic.main.activity_log_in.*
-import com.google.firebase.firestore.FirebaseFirestore
 import com.paktalin.vocabularynotebook.R
-import com.paktalin.vocabularynotebook.User
-import com.paktalin.vocabularynotebook.Vocabulary
-import java.util.*
+import com.paktalin.vocabularynotebook.UserManager
 
 class LogInActivity : AppCompatActivity() {
 
@@ -27,18 +22,20 @@ class LogInActivity : AppCompatActivity() {
         setContentView(R.layout.activity_log_in)
 
         mAuth = FirebaseAuth.getInstance()
-        btnLogIn!!.setOnClickListener({ signIn() })
+        btnLogIn!!.setOnClickListener({ logIn() })
         btnSignUp!!.setOnClickListener({ signUp() })
         btnRandomUser!!.setOnClickListener({ createRandomUser() })
     }
 
     override fun onStart() {
         super.onStart()
-        val currentUser = mAuth!!.currentUser
-        if (currentUser != null) startUserActivity()
+        if (mAuth!!.currentUser != null) {
+            Log.d(TAG, "there is a logged in user")
+            startUserActivity()
+        }
     }
 
-    private fun signIn() {
+    private fun logIn() {
         val email = etEmail!!.text.toString()
         val password = etPassword!!.text.toString()
 
@@ -69,8 +66,7 @@ class LogInActivity : AppCompatActivity() {
                     .addOnCompleteListener(this) { task ->
                         if (task.isSuccessful) {
                             Log.d(TAG, "Successfully signed up a new user")
-                            addNewUserToDb(mAuth!!.currentUser!!)
-                            startUserActivity()
+                            UserManager.addNewUserToDb(mAuth!!.currentUser!!, this)
                         }
                         else {
                             Log.w(TAG, "createUserWithEmail:failure", task.exception)
@@ -81,7 +77,7 @@ class LogInActivity : AppCompatActivity() {
         }
     }
 
-    private fun startUserActivity() {
+    fun startUserActivity() {
         Log.d(TAG, "Signed in successfully")
         val userActivityIntent = Intent(this@LogInActivity, UserActivity::class.java)
         startActivity(userActivityIntent)
@@ -95,25 +91,6 @@ class LogInActivity : AppCompatActivity() {
         return true
     }
 
-    private fun addNewUserToDb(newUser: FirebaseUser) {
-        //todo add condition to writing to the db in Firebase Console (request.auth.uid)
-        //todo delete account if couldn't add user to the db
-        val db = FirebaseFirestore.getInstance()
-        val user = User(newUser.email)
-
-        db.collection("vocabularies").add(Vocabulary())
-                .addOnSuccessListener { firstVocabularyRef ->
-                    Log.d(TAG, "Vocabulary successfully created: " + firstVocabularyRef.path)
-                    user.vocabularies = Collections.singletonList(firstVocabularyRef)
-
-                    db.collection("users").document(newUser.uid).set(user)
-                            .addOnCompleteListener({ task ->
-                                if (task.isSuccessful) Log.i(TAG, "Successfully added user to the collection")
-                                else Log.w(TAG, "addUser:failure", task.exception)
-                            })
-                }
-    }
-
     @SuppressLint("SetTextI18n")
     private fun createRandomUser() {
         etEmail.setText("random@gmail.com")
@@ -122,6 +99,6 @@ class LogInActivity : AppCompatActivity() {
     }
 
     companion object {
-        private val TAG = "VN/" + SignIn::class.simpleName
+        private val TAG = "VN/" + LogInActivity::class.simpleName
     }
 }
\ No newline at end of file

app/src/main/java/com/paktalin/vocabularynotebook/activities/UserActivity.kt

@@ -12,7 +12,7 @@ import com.google.firebase.firestore.DocumentSnapshot
 import com.google.firebase.firestore.FirebaseFirestore
 import com.paktalin.vocabularynotebook.R
 import kotlinx.android.synthetic.main.activity_main.*
-import kotlinx.android.synthetic.main.content_main.*
+import kotlinx.android.synthetic.main.activity_vocabulary.*
 
 class UserActivity : AppCompatActivity() {
 
@@ -23,11 +23,9 @@ class UserActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        val navigationView = findViewById<NavigationView>(R.id.navigationView)
         navigationView.setNavigationItemSelectedListener { menuItem ->
             menuItem.isChecked = true
             drawerLayout!!.closeDrawers()
-
             true
         }
 

app/src/main/res/layout/activity_main.xml

@@ -9,7 +9,7 @@
     tools:openDrawer="start">
 
     <include
-        layout="@layout/content_main"
+        layout="@layout/activity_vocabulary"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 

app/src/main/res/layout/content_main.xml → app/src/main/res/layout/activity_vocabulary.xml

@@ -30,9 +30,15 @@
         android:layout_marginRight="8dp"
         android:layout_marginStart="8dp"
         android:layout_marginTop="8dp"
-        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintHorizontal_bias="0.5"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/tvCongrats" />
+
+    <android.support.v7.widget.RecyclerView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        app:layout_constraintTop_toBottomOf="@+id/tvUserData" />
+
 </android.support.constraint.ConstraintLayout>