Implemented null check for cookies to prevent app crash, tweaked HelperFunctions#assignRanking to prepare for future years

app/src/main/java/com/denizd/substitutionplan/activities/Login.kt

@@ -18,11 +18,13 @@ import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.vectordrawable.graphics.drawable.AnimatedVectorDrawableCompat
 import com.denizd.substitutionplan.R
 import com.denizd.substitutionplan.data.HelperFunctions
 import com.denizd.substitutionplan.data.LoginWebViewClient
 import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
+import com.google.android.material.snackbar.Snackbar
 import kotlin.math.hypot
 
 /**
@@ -34,11 +36,13 @@ internal class Login : AppCompatActivity(R.layout.activity_login_webview), Login
     private lateinit var prefs: SharedPreferences
     private lateinit var parentLayout: ConstraintLayout
     private lateinit var logInButton: ExtendedFloatingActionButton
+    private lateinit var snackBarLayout: CoordinatorLayout
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setTheme(R.style.AppTheme0)
         parentLayout = findViewById(R.id.constraintLayout)
+        snackBarLayout = findViewById(R.id.snackBarLayout)
         parentLayout.layoutTransition.enableTransitionType(LayoutTransition.CHANGING)
         val title = findViewById<TextView>(R.id.txtWelcome)
         prefs = PreferenceManager.getDefaultSharedPreferences(this)
@@ -65,6 +69,8 @@ internal class Login : AppCompatActivity(R.layout.activity_login_webview), Login
     override fun onLoginSucceeded(success: Boolean) {
         if (success) {
             success()
+        } else {
+            Snackbar.make(snackBarLayout, getString(R.string.error_please_try_again), Snackbar.LENGTH_LONG).show()
         }
     }
 

app/src/main/java/com/denizd/substitutionplan/data/HelperFunctions.kt

@@ -323,15 +323,15 @@ internal object HelperFunctions {
      * @return the ranking as an integer
      */
     fun assignRanking(group: String, isPSA: Boolean): Int {
-        if (isPSA) return -31
+        if (isPSA) return -102
         return try {
             when {
-                checkStringForArray(group.substring(0, 1), juniors) -> -30
-                group.substring(0, 1) == "1" || group.substring(0, 1) == "2" -> {
-                    val a = group.substring(1, 2).toInt()
-                    a - (a * 2)
+                group.substring(0, 2).toIntOrNull() != null -> {
+                    val a = group.substring(0, 2).toInt()
+                    -a
                 }
-                else -> -29
+                checkStringForArray(group.substring(0, 1), juniors) -> -101
+                else -> -100
             }
         } catch (e: Exception) {
             0

app/src/main/java/com/denizd/substitutionplan/data/LoginWebViewClient.kt

@@ -15,6 +15,10 @@ import java.lang.IllegalStateException
  */
 internal class LoginWebViewClient(private val successListener: OnLoginSuccessListener) : WebViewClient() {
 
+    private val schoolUrls = arrayOf("https://307.joomla.schule.bremen.de/index.php/component/users/#top",
+        "https://307.joomla.schule.bremen.de/index.php/component/users/?task=user.login&Itemid=171",
+        "https://307.joomla.schule.bremen.de/index.php/component/users/profile?Itemid=171")
+
     /**
      * onPageStarted has been overridden to prevent users from reaching a domain different from
      * the school's login page
@@ -22,9 +26,7 @@ internal class LoginWebViewClient(private val successListener: OnLoginSuccessLis
     override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
         super.onPageStarted(view, url, favicon)
 
-        if (url != "https://307.joomla.schule.bremen.de/index.php/component/users/profile?Itemid=171"
-            && url != "https://307.joomla.schule.bremen.de/index.php/component/users/#top"
-            && url != "https://307.joomla.schule.bremen.de/index.php/component/users/?task=user.login&Itemid=171") {
+        if (!HelperFunctions.checkStringForArray(url.toString(), schoolUrls)) {
             reloadLoginPage(webView = view)
         }
     }
@@ -39,7 +41,10 @@ internal class LoginWebViewClient(private val successListener: OnLoginSuccessLis
 
         val cookies = CookieManager.getInstance().getCookie(url)
 
-        if (cookies.contains("joomla_user_state=logged_in")) {
+        if (cookies == null) {
+            reloadLoginPage(webView = view)
+            successListener.onLoginSucceeded(false)
+        } else if (cookies.contains("joomla_user_state=logged_in")) {
             successListener.onLoginSucceeded(true)
         }
     }
@@ -54,10 +59,10 @@ internal class LoginWebViewClient(private val successListener: OnLoginSuccessLis
     internal interface OnLoginSuccessListener {
 
         /**
-         * This function can be overridden to execute code when a login has been successful
+         * This function returns a boolean value depending on the success status of the login process
          *
          * @param success   boolean value that is set to true if the cookie could be found,
-         *                  false otherwise
+         *                  false if an error occurred
          */
         fun onLoginSucceeded(success: Boolean)
     }

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

@@ -74,4 +74,15 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"/>
 
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:id="@+id/snackBarLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top"
+        android:clickable="false"
+        android:focusable="false"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"/>
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values-de/strings.xml

@@ -164,4 +164,5 @@
     <string name="ordering_system_hint">Sortierweise</string>
     <string name="ordering_systems_dialog_title">Informationen über Sortierweisen</string>
     <string name="ordering_systems_dialog_text">Du kannst zwischen zwei Sortierweisen auswählen, welche die Reihenfolge der Einträge auf dem Vertretungsplan bestimmen.\n\nStandardmäßig ist \'App-spezifisch\' ausgewählt; dies bietet einen konsistenten Plan sortiert nach Klassen, dann nach Stunden.\n\n\'Website-Original\' bietet die Original-Reihenfolge der Website. Diese ist jedoch nicht konsistent, weswegen \'App-spezifisch\' standardmäßig ausgewählt ist.</string>
+    <string name="error_please_try_again">Ein Fehler ist aufgetreten, bitte versuche es erneut</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -176,4 +176,5 @@
     <string name="ordering_system_hint">Ordering system</string>
     <string name="ordering_systems_dialog_title">Information on ordering systems</string>
     <string name="ordering_systems_dialog_text">You may pick between two ordering systems that dictate the order in which the items on the substitution plan will appear in.\n\nThe default \'app-specific\' is an algorithm implemented in this app that provides a consistently-sorted substitution plan ordered just like the substitution plan on the website used to; sorted by classes, then by time.\n\n\'Website original\' offers the items on the substitution plan just like they\'re presented on the school website, but since these are not guaranteed to be consistent, \'app-specific\' is picked by default.</string>
+    <string name="error_please_try_again">An error occurred, please try again</string>
 </resources>