Started converting the app to a true MVVM architecture; fixed 7 month old bug that would cause substitution items to not be shown on the personal plan if they contained a question mark (e.g. 'INF7?inf999')

app/src/main/java/com/denizd/substitutionplan/adapters/SubstitutionAdapter.kt

@@ -2,7 +2,6 @@ package com.denizd.substitutionplan.adapters
 
 import android.content.ActivityNotFoundException
 import android.content.Context
-import android.content.SharedPreferences
 import android.net.Uri
 import android.text.SpannableString
 import android.text.style.StrikethroughSpan
@@ -26,9 +25,9 @@ import java.util.*
  * PlanFragment.kt and its subclasses
  *
  * @param substitutions a list of all substitutions of data type Substitution
- * @param prefs         a reference to the app's Shared Preferences used to get user-set colours
+ * @param colours       a map of all user-defined colours for the individual courses
  */
-internal class SubstitutionAdapter(private var substitutions: List<Substitution>, private val prefs: SharedPreferences) : RecyclerView.Adapter<SubstitutionAdapter.CardViewHolder>() {
+internal class SubstitutionAdapter(private var substitutions: List<Substitution>, private val colours: Map<String, String>) : RecyclerView.Adapter<SubstitutionAdapter.CardViewHolder>() {
 
     /**
      * The ViewHolder class used by SubstitutionAdapter.kt to resolve references to views in
@@ -114,11 +113,7 @@ internal class SubstitutionAdapter(private var substitutions: List<Substitution>
             View.GONE
         } else {
             val colourString = SubstUtil.getColourString(holder.course.text.toString())
-            val colourPrefsInt = if (colourString.isNotEmpty()) {
-                prefs.getString("card$colourString", "") ?: ""
-            } else {
-                ""
-            }
+            val colourPrefsInt = colours[colourString] ?: ""
             colour = SubstUtil.getColourForString(colourPrefsInt, holder.context)
             cardBackgroundColour = if (colour != 0) {
                 colour

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

@@ -0,0 +1,8 @@
+package com.denizd.substitutionplan.data
+
+internal enum class Caller {
+    SUBSTITUTION,
+    FOODMENU,
+    JOBSERVICE,
+    SETTINGS
+}

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

@@ -1,279 +0,0 @@
-package com.denizd.substitutionplan.data
-
-import android.app.*
-import android.content.Context
-import android.content.Intent
-import android.media.RingtoneManager
-import android.net.Uri
-import android.os.AsyncTask
-import android.os.Build
-import android.util.Log
-import androidx.preference.PreferenceManager
-import android.view.View
-import android.widget.RemoteViews
-import androidx.core.app.NotificationCompat
-import androidx.core.content.ContextCompat
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import com.denizd.substitutionplan.database.FoodRepository
-import com.denizd.substitutionplan.R
-import com.denizd.substitutionplan.database.SubstRepository
-import com.denizd.substitutionplan.activities.Main
-import com.denizd.substitutionplan.models.Food
-import com.denizd.substitutionplan.models.Substitution
-import com.google.android.material.snackbar.Snackbar
-import org.jsoup.Jsoup
-import java.lang.ref.WeakReference
-import kotlin.collections.ArrayList
-
-/**
- *  This class gets data from the djd4rkn355.github.io domain asynchronously and persists it in the
- *  database. By using booleans as parameters, network usage and speed can be improved as only
- *  requested data will be downloaded and processed. Furthermore, the class provides a boolean
- *  to determine whether to send a notification to the user, if applicable.
- *
- *  @param isPlan           substitution plan will be downloaded and persisted in the database if true
- *  @param isMenu           food menu will be downloaded and persisted in the database if true
- *  @param isJobService     enables sending of a notification if true
- *  @param forced           if true, times for food menu and substitution table will be overwritten
- *                          with empty values to enable a forced refresh
- *  @param context          the context of the application that will be stored as a WeakReference
- *                          to avoid memory leakage
- *  @param application      a reference to the application that will be stored as a WeakReference
- *  @param parentView       a reference to the parent view that will be stored as a WeakReference
- */
-internal class DataFetcher(
-        isPlan: Boolean,
-        isMenu: Boolean,
-        isJobService: Boolean = false,
-        forced: Boolean = false,
-        context: Context,
-        application: Application,
-        parentView: View?
-) : AsyncTask<Void, Void, Void>() {
-
-    private var jobService = isJobService
-    private var plan = isPlan
-    private var menu = isMenu
-    private var forceRefresh = forced
-
-    private var mContext = WeakReference(context)
-    private var mApplication = application
-    private var mView = WeakReference(parentView)
-    private var notificationText = ""
-    private var informational = ""
-    private val prefs = PreferenceManager.getDefaultSharedPreferences(mContext.get())
-    private val edit = prefs.edit()
-    private var currentTime = ""
-    private var currentFoodTime = ""
-    private var substUrl = "https://djd4rkn355.github.io/avh_substitutions.html"
-    private var foodUrl = "https://djd4rkn355.github.io/food.html"
-    private var websitePriority = 0
-
-    override fun doInBackground(vararg params: Void?): Void? {
-        try {
-            if (prefs.getBoolean("testUrls", false)) {
-                substUrl = "https://djd4rkn355.github.io/subst_test.html"
-                foodUrl = "https://djd4rkn355.github.io/food_test.html"
-            } else if ((prefs.getString("custom_test_url", "") ?: "").isNotEmpty()) {
-                substUrl = "https://djd4rkn355.github.io/${prefs.getString("custom_test_url", "")}"
-            }
-
-            if (forceRefresh) {
-                edit.putString("timeNew", "").putString("newFoodTime", "").apply()
-            }
-
-            if (menu) {
-                requestFoodMenuData()
-            }
-            if (plan) {
-                requestSubstPlan()
-            }
-
-            if (plan || menu) {
-                mView.get()?.let { v: View ->
-                    var snackText = "${mContext.get()?.getText(R.string.last_updated)} ${when {
-                        plan -> currentTime
-                        menu -> currentFoodTime
-                        else -> "---"
-                    }}"
-                    snackText = if (forceRefresh) mContext.get()?.getString(R.string.force_refresh_successful) ?: "" else snackText
-                    val snackBarView = v.findViewById<View>(R.id.coordination)
-                    Snackbar.make(snackBarView, snackText, Snackbar.LENGTH_LONG).show()
-                }
-            }
-        } catch (e: Exception) {
-            mView.get()?.let { v: View ->
-                val snackBarView = v.findViewById<View>(R.id.coordination)
-                Snackbar.make(snackBarView, mContext.get()?.getString(R.string.no_internet_connection) ?: "", Snackbar.LENGTH_LONG).setBackgroundTint(ContextCompat.getColor(mContext.get()!!,
-                    R.color.colorError
-                )).show()
-            }
-            prefs.edit().putString("debug_recent_exception", Log.getStackTraceString(e)).apply()
-        }
-        return null
-    }
-
-    override fun onPostExecute(result: Void?) {
-        mView.get()?.let {
-            try {
-                it.findViewById<SwipeRefreshLayout>(R.id.swipe_refresh_layout).isRefreshing = false
-            } catch (ignored: Exception) {
-            }
-        }
-        mView.clear()
-        mContext.clear()
-    }
-
-    private fun requestFoodMenuData() {
-        val docFood = Jsoup.connect(foodUrl).get()
-        currentFoodTime = docFood.select("h1")[0].text()
-        val foodRepository = FoodRepository(mApplication)
-        if (currentFoodTime != prefs.getString("newFoodTime", "")) {
-            val foodElements = docFood.select("th")
-            foodRepository.deleteAll()
-
-            val indices = ArrayList<Int>()
-            val daysAndVon = arrayOf("montag", "dienstag", "mittwoch", "donnerstag", "freitag", "von", "wünschen")
-            for (i in 0 until foodElements.size) {
-                if (SubstUtil.checkStringForArray(foodElements[i].text(), daysAndVon, true)) indices.add(i)
-            }
-            indices.add(foodElements.size)
-
-            for (l in 0 until indices.size - 1) {
-                var s = ""
-                for (i2 in indices[l] until indices[l + 1]) {
-                    if (s.isEmpty()) {
-                        s = foodElements[i2].text()
-                    } else {
-                        s += "\n${foodElements[i2].text()}"
-                    }
-                }
-                foodRepository.insert(Food(s, l))
-            }
-            edit.putString("newFoodTime", currentFoodTime).apply()
-        }
-    }
-
-    private fun requestSubstPlan() {
-        val doc = Jsoup.connect(substUrl).get()
-        currentTime = doc.select("h1")[0].text()
-        val substRepo = SubstRepository(mApplication)
-        if (currentTime != prefs.getString("timeNew", "")) {
-            val rows = doc.select("tr")
-            val paragraphs = doc.select("h6")
-            val substArray = ArrayList<Substitution>()
-
-            val coursePreference = prefs.getString("courses", "") ?: ""
-            val classPreference = prefs.getString("classes", "") ?: ""
-
-            for (i in 0 until paragraphs.size) {
-                if (i == 0) {
-                    informational = formatElement(paragraphs[i].html())
-                } else {
-                    informational += "\n\n" + formatElement(paragraphs[i].html())
-                }
-            }
-            edit.putString("informational", informational).apply()
-
-            substRepo.deleteAllSubst()
-
-            for (i in 0 until rows.size) {
-                val row = rows[i]
-                val cols = row.select("th")
-
-                val group = cols[0].text()
-                val date = cols[1].text()
-                val subst = Substitution(
-                    group = group,
-                    date = date,
-                    time = cols[2].text(),
-                    course = cols[3].text(),
-                    room = cols[4].text(),
-                    additional = cols[5].text(),
-                    teacher = cols[6].text(),
-                    type = cols[7].text(),
-                    priority = SubstUtil.assignRanking(group, (date.length > 2 && date.substring(0, 3) == "psa")),
-                    date_priority = SubstUtil.assignDatePriority(date),
-                    website_priority = websitePriority
-                )
-                substArray.add(subst)
-                substRepo.insert(subst)
-                websitePriority += 1
-            }
-            var countOfNotificationItems = 0
-            var countOfMoreNotificationItems = 0
-            if (jobService && prefs.getBoolean("notif", true)) {
-                substArray.filter { substItem ->
-                    SubstUtil.checkPersonalSubstitutions(
-                        substItem,
-                        coursePreference,
-                        classPreference,
-                        false
-                    )
-                }.forEach { substItem ->
-                    if (countOfNotificationItems < 4) {
-                        notificationText += ("${if (notificationText.isNotEmpty()) ",\n" else ""}${substItem.course}: ${if (substItem.additional.isNotEmpty()) substItem.additional else if (substItem.type.isNotEmpty()) substItem.type else "---"}")
-                        countOfNotificationItems += 1
-                    } else {
-                        countOfMoreNotificationItems += 1
-                    }
-                }
-                if (countOfMoreNotificationItems > 0) {
-                    notificationText += mContext.get()?.resources?.getQuantityString(R.plurals.notification_more_messages, countOfMoreNotificationItems, countOfMoreNotificationItems)
-                }
-            }
-
-            if (notificationText.isNotEmpty()) {
-                sendNotification()
-            }
-
-            edit.putString("timeNew", currentTime).apply()
-        }
-    }
-
-    private fun sendNotification() {
-        mContext.get()?.let { context ->
-            val openApp = Intent(context, Main::class.java)
-            openApp.flags = Intent.FLAG_ACTIVITY_NEW_TASK
-            openApp.flags += Intent.FLAG_ACTIVITY_CLEAR_TASK
-            val openAppPending = PendingIntent.getActivity(context, 0, openApp, 0)
-
-            val notificationLayout = RemoteViews(context.packageName, R.layout.notification)
-            notificationLayout.setTextViewText(R.id.notification_title, context.getString(
-                R.string.substitution_plan
-            ))
-            notificationLayout.setTextViewText(R.id.notification_textview, notificationText)
-
-            val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
-
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                SubstUtil.getNotificationChannel(context, prefs)
-            }
-
-            val notification = NotificationCompat.Builder(context, SubstUtil.notificationChannelId)
-                .setStyle(NotificationCompat.DecoratedCustomViewStyle())
-                .setCustomContentView(notificationLayout)
-                .setContentIntent(openAppPending)
-                .setAutoCancel(true)
-                .setColor(ContextCompat.getColor(context, R.color.colorAccent))
-
-            notification.setSmallIcon(if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) R.drawable.ic_avh else R.drawable.ic_avhlogo)
-
-            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
-                val sound = if ((prefs.getString("ringtoneUri", "") ?: "").isNotEmpty()) {
-                    Uri.parse(prefs.getString("ringtoneUri", "") ?: "")
-                } else {
-                    RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
-                }
-                notification.setSound(sound)
-            }
-
-            manager.notify(1, notification.build())
-        }
-    }
-
-    private fun formatElement(element: String): String {
-        return element
-                .replace("<br>", "\n")
-    }
-}

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

@@ -81,16 +81,11 @@ internal object SubstUtil {
 
     const val notificationChannelId = "general"
 
-    fun getEmptyGeneralSubstitution(context: Context) = arrayOf(
-            Substitution("", "", "", context.getString(R.string.plan_empty), "", "", "", "", 0, 0, 0)
-    ).toList()
-
-    fun getEmptyPersonalSubstitution(context: Context) =
-            Substitution("", "", "", context.getString(R.string.personal_plan_empty), "", "", "", "", 0, 0, 0)
-
-    fun getEmptyFoodMenu(context: Context) = arrayOf(
-            Food("\n${context.getString(R.string.food_menu_empty)}\n", 0)
-    ).toList()
+    // Constants for Firebase Cloud Messaging Topics
+    const val FB_TOPIC_ANDROID = "substitutions-android"
+    const val FB_TOPIC_BROADCAST = "substitutions-broadcast"
+    const val FB_TOPIC_IOS = "substitutions-ios"
+    const val FB_TOPIC_DEVELOPMENT = "substitutions-debug"
 
     /**
      * This function returns an array that contains all data relevant to tinting individual entries
@@ -248,39 +243,6 @@ internal object SubstUtil {
         edit.apply()
     }
 
-    /**
-     * This function serves for checking whether a course on the substitution plan is relevant to
-     * the user and should be shown on their personal plan as well as in their notifications
-     *
-     * @param substitution             the substitution item
-     * @param coursePreference  a string that represents the courses the user is enrolled in
-     * @param classPreference   a string that represents the group the user is in
-     * @param psa               decide whether or not any PSA items should be included in the filter
-     *
-     * @return true if the substitution is relevant to the user, false otherwise
-     */
-    fun checkPersonalSubstitutions(substitution: Substitution, coursePreference: String, classPreference: String, psa: Boolean): Boolean {
-        val group = substitution.group
-        val course = substitution.course
-        if (psa && substitution.date.isNotEmpty() && substitution.date.substring(0, 3) == "psa") {
-            return true
-        }
-        if (coursePreference.isEmpty() && classPreference.isNotEmpty()) {
-            if (group.isNotEmpty()) {
-                if (classPreference.contains(group) || group.contains(classPreference)) {
-                    return true
-                }
-            }
-        } else if (classPreference.isNotEmpty() && coursePreference.isNotEmpty()) {
-            if (group != "" && course != "") {
-                if ((classPreference.contains(group) || group.contains(classPreference)) && coursePreference.contains(course)) {
-                    return true
-                }
-            }
-        }
-        return false
-    }
-
     /**
      * This function is used throughout some classes to set the theme according to the device's
      * Android version before an app theme may be picked in the settings. As Main.kt as well as

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

@@ -1,12 +0,0 @@
-package com.denizd.substitutionplan.data
-
-/**
- * Enum class for declaring Firebase Cloud Messaging topics without using the raw strings
- * throughout the project to avoid human error
- */
-internal enum class Topic(val tag: String) {
-    ANDROID("substitutions-android"),
-    BROADCAST("substitutions-broadcast"),
-    IOS("substitutions-ios"),
-    DEVELOPMENT("substitutions-debug")
-}

app/src/main/java/com/denizd/substitutionplan/database/FoodRepository.kt

@@ -1,27 +0,0 @@
-package com.denizd.substitutionplan.database
-
-import android.app.Application
-import android.os.AsyncTask
-import androidx.lifecycle.LiveData
-import com.denizd.substitutionplan.models.Food
-
-internal class FoodRepository(application: Application) {
-
-    private val substDao: SubstDao?
-    val allFoods: LiveData<List<Food>>?
-
-    init {
-        val database =
-            SubstDatabase.getFoodInstance(application)
-        substDao = database?.substDao()
-        allFoods = substDao?.allFoods
-    }
-
-    fun insert(food: Food) {
-        substDao?.insertFood(food)
-    }
-
-    fun deleteAll() {
-        substDao?.deleteAllFoods()
-    }
-}

app/src/main/java/com/denizd/substitutionplan/database/FoodViewModel.kt

@@ -1,32 +0,0 @@
-package com.denizd.substitutionplan.database
-
-import android.app.Application
-import android.view.View
-import androidx.lifecycle.AndroidViewModel
-import androidx.lifecycle.LiveData
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import com.denizd.substitutionplan.data.DataFetcher
-import com.denizd.substitutionplan.models.Food
-
-internal class FoodViewModel(application: Application) : AndroidViewModel(application) {
-
-    private val repository: FoodRepository = FoodRepository(application)
-    val allFoods: LiveData<List<Food>>?
-    private val app = application
-
-    init {
-        allFoods = repository.allFoods
-    }
-
-    fun refresh(swipeRefreshLayout: SwipeRefreshLayout, rootView: View) {
-        swipeRefreshLayout.isRefreshing = true
-        DataFetcher(
-            isPlan = false,
-            isMenu = true,
-            isJobService = false,
-            context = app,
-            application = app,
-            parentView = rootView
-        ).execute()
-    }
-}

app/src/main/java/com/denizd/substitutionplan/database/SettingsRepository.kt

@@ -0,0 +1,31 @@
+package com.denizd.substitutionplan.database
+
+import android.app.Application
+import android.database.Cursor
+import android.media.RingtoneManager
+import com.denizd.substitutionplan.models.Ringtone
+
+internal class SettingsRepository(private val application: Application) {
+
+    val ringtones: List<Ringtone> by lazy {
+        lateinit var ringtoneCursor: Cursor
+        val ringtoneManager = RingtoneManager(application).apply {
+            setType(RingtoneManager.TYPE_NOTIFICATION)
+            ringtoneCursor = cursor
+        }
+        val alarms = ArrayList<Ringtone>()
+
+        while (!ringtoneCursor.isAfterLast && ringtoneCursor.moveToNext()) {
+            val position = ringtoneCursor.position
+            alarms.add(
+                Ringtone(
+                    ringtoneManager.getRingtone(position).getTitle(application),
+                    ringtoneManager.getRingtoneUri(position).toString()
+                )
+            )
+        }
+        alarms
+    }
+
+
+}

app/src/main/java/com/denizd/substitutionplan/database/SubstDatabase.kt

@@ -37,12 +37,12 @@ internal abstract class SubstDatabase : RoomDatabase() {
             }
         }
 
-        private var instance: SubstDatabase? = null
+        private var substInstance: SubstDatabase? = null
 
-        fun getInstance(context: Context): SubstDatabase? {
-            if (instance == null) {
+        fun getSubstInstance(context: Context): SubstDatabase? {
+            if (substInstance == null) {
                 synchronized (SubstDatabase::class) {
-                    instance = Room.databaseBuilder(context.applicationContext,
+                    substInstance = Room.databaseBuilder(context.applicationContext,
                         SubstDatabase::class.java,
                         "subst_database")
                         .addMigrations(addTeacherColumn, addTypeColumn, addDatePriorityColumn, addWebsitePriorityColumn)
@@ -50,7 +50,7 @@ internal abstract class SubstDatabase : RoomDatabase() {
                         .build()
                 }
             }
-            return instance
+            return substInstance
         }
 
         private var foodInstance: SubstDatabase? = null

app/src/main/java/com/denizd/substitutionplan/database/SubstRepository.kt

@@ -1,30 +1,379 @@
 package com.denizd.substitutionplan.database
 
 import android.app.Application
-import android.os.AsyncTask
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.content.SharedPreferences
+import android.content.res.Configuration
+import android.media.RingtoneManager
+import android.net.Uri
+import android.os.Build
+import android.util.Log
+import android.widget.RemoteViews
+import androidx.core.app.NotificationCompat
+import androidx.core.content.ContextCompat
 
 import androidx.lifecycle.LiveData
+import androidx.preference.PreferenceManager
+import com.denizd.substitutionplan.R
+import com.denizd.substitutionplan.activities.Main
+import com.denizd.substitutionplan.data.Caller
+import com.denizd.substitutionplan.data.SubstUtil
+import com.denizd.substitutionplan.models.Food
 import com.denizd.substitutionplan.models.Substitution
+import org.jsoup.Jsoup
 
-internal class SubstRepository(application: Application) {
+internal class SubstRepository(private val application: Application) {
 
-    private val substDao: SubstDao?
+    private val substitutionDao: SubstDao?
+    private val foodMenuDao: SubstDao?
     val allSubstitutionsSorted: LiveData<List<Substitution>>?
     val allSubstitutionsOriginal: LiveData<List<Substitution>>?
+    val allFoodItems: LiveData<List<Food>>?
+
+    private val prefs = PreferenceManager.getDefaultSharedPreferences(application)
+
+    val substitutionPlanColours: Map<String, String>
+            get() = mapOf(
+                "German" to prefs.getNonNullString("cardGerman"),
+                "Maths" to prefs.getNonNullString("cardMaths"),
+                "English" to prefs.getNonNullString("cardEnglish"),
+                "PhysEd" to prefs.getNonNullString("cardPhysEd"),
+                "Politics" to prefs.getNonNullString("cardPolitics"),
+                "Theatre" to prefs.getNonNullString("cardTheatre"),
+                "Physics" to prefs.getNonNullString("cardPhysics"),
+                "Biology" to prefs.getNonNullString("cardBiology"),
+                "Chemistry" to prefs.getNonNullString("cardChemistry"),
+                "Philosophy" to prefs.getNonNullString("cardPhilosophy"),
+                "Latin" to prefs.getNonNullString("cardLatin"),
+                "Spanish" to prefs.getNonNullString("cardSpanish"),
+                "French" to prefs.getNonNullString("cardFrench"),
+                "CompSci" to prefs.getNonNullString("cardCompSci"),
+                "History" to prefs.getNonNullString("cardHistory"),
+                "Religion" to prefs.getNonNullString("cardReligion"),
+                "Geography" to prefs.getNonNullString("cardGeography"),
+                "Arts" to prefs.getNonNullString("cardArts"),
+                "Music" to prefs.getNonNullString("cardMusic"),
+                "Turkish" to prefs.getNonNullString("cardTurkish"),
+                "Chinese" to prefs.getNonNullString("cardChinese"),
+                "GLL" to prefs.getNonNullString("cardGLL"),
+                "WAT" to prefs.getNonNullString("cardWAT"),
+                "Forder" to prefs.getNonNullString("cardForder"),
+                "WP" to prefs.getNonNullString("cardWP")
+    )
+    val shouldAutoRefresh: Boolean
+        get() = prefs.getBoolean("autoRefresh", false)
+
+    val shouldUseAppSorting: Boolean
+        get() = prefs.getBoolean("app_specific_sorting", true)
+
+    val emptyGeneralPlan: List<Substitution> by lazy {
+        listOf(Substitution("", "", "", application.getString(R.string.plan_empty), "", "", "", "", 0, 0, 0))
+    }
+
+    val emptyPersonalSubstitution: Substitution by lazy {
+        Substitution("", "", "", application.getString(R.string.personal_plan_empty), "", "", "", "", 0, 0, 0)
+    }
+
+    val emptyFoodMenu: List<Food> by lazy {
+        listOf(Food("\n${application.getString(R.string.food_menu_empty)}\n", 0))
+    }
 
     init {
-        val database =
-            SubstDatabase.getInstance(application)
-        substDao = database?.substDao()
-        allSubstitutionsSorted = substDao?.allSubstitutionsSorted
-        allSubstitutionsOriginal = substDao?.allSubstitutionsOriginal
+        val substInstance = SubstDatabase.getSubstInstance(application)
+        val foodInstance = SubstDatabase.getFoodInstance(application)
+        substitutionDao = substInstance?.substDao()
+        foodMenuDao = foodInstance?.substDao()
+        allSubstitutionsSorted = substitutionDao?.allSubstitutionsSorted
+        allSubstitutionsOriginal = substitutionDao?.allSubstitutionsOriginal
+        allFoodItems = foodMenuDao?.allFoods
     }
 
-    fun insert(substitution: Substitution) {
-        substDao?.insertSubst(substitution)
+    private fun insert(substitution: Substitution) {
+        substitutionDao?.insertSubst(substitution)
     }
 
-    fun deleteAllSubst() {
-        substDao?.deleteAllSubst()
+    private fun insert(food: Food) {
+        foodMenuDao?.insertFood(food)
+    }
+
+    private fun deleteAllSubst() {
+        substitutionDao?.deleteAllSubst()
+    }
+
+    private fun deleteAllFoodItems() {
+        foodMenuDao?.deleteAllFoods()
+    }
+
+    fun getGridColumnCount(config: Configuration): Int {
+        return if (application.resources.getBoolean(R.bool.isTablet)) {
+            when (config.orientation) {
+                Configuration.ORIENTATION_PORTRAIT -> 2
+                else -> 3
+            }
+        } else {
+            when (config.orientation) {
+                Configuration.ORIENTATION_PORTRAIT -> 1
+                else -> 2
+            }
+        }
+    }
+
+    private fun SharedPreferences.getNonNullString(key: String): String {
+        return getString(key, "") ?: ""
+    }
+
+    fun externalNonNullString(key: String): String {
+        return prefs.getNonNullString(key)
+    }
+
+    private fun SharedPreferences.putAndApplyString(key: String, value: String) {
+        edit().putString(key, value).apply()
+    }
+
+    fun putAndApplyString(key: String, value: String) {
+        prefs.putAndApplyString(key, value)
+    }
+
+    private fun Substitution.checkIfPersonal(classPreference: String, coursePreference: String, includesPsa: Boolean = false): Boolean {
+        if (includesPsa && date.isNotEmpty() && date.substring(0, 3) == "psa") {
+            return true
+        }
+        if (coursePreference.isEmpty() && classPreference.isNotEmpty()) {
+            if (group.isNotEmpty()) {
+                if (classPreference.contains(group) || group.contains(classPreference)) {
+                    return true
+                }
+            }
+        } else if (classPreference.isNotEmpty() && coursePreference.isNotEmpty()) {
+            if (group != "" && course != "") {
+                if ((classPreference.contains(group) || group.contains(classPreference))) {
+                    val questionMark = course.indexOf("?")
+                    if (questionMark == -1) {
+                        if (coursePreference.contains(course)) {
+                            return true
+                        }
+                    } else {
+                        if (coursePreference.contains(course.substring(0, questionMark - 1))
+                            || coursePreference.contains(course.substring(questionMark + 1))) {
+                            return true
+                        }
+                    }
+                }
+            }
+        }
+        return false
+    }
+
+    fun checkIfSubstitutionPersonal(substitution: Substitution, classPreference: String, coursePreference: String, includesPsa: Boolean): Boolean {
+        return substitution.checkIfPersonal(classPreference, coursePreference, includesPsa)
+    }
+
+    private fun getData(caller: Caller): Pair<String, Boolean> {
+
+        fun requestSubstPlan(url: String): Pair<String, Boolean> {
+            var notificationText = ""
+            var hasUpdated = false
+
+            val doc = Jsoup.connect(url).get()
+            val currentTime = doc.select("h1")[0].text()
+
+            if (currentTime != prefs.getNonNullString("timeNew")) {
+                val rows = doc.select("tr")
+                val paragraphs = doc.select("h6")
+                val substArray = ArrayList<Substitution>()
+
+                val coursePreference = prefs.getNonNullString("courses")
+                val classPreference = prefs.getNonNullString("classes")
+
+                var informational = ""
+                for (i in 0 until paragraphs.size) {
+                    if (i == 0) {
+                        informational = paragraphs[i].html().replace("<br>", "\n")
+                    } else {
+                        informational += "\n\n" + paragraphs[i].html().replace("<br>", "\n")
+                    }
+                }
+                prefs.putAndApplyString("informational", informational)
+
+                deleteAllSubst()
+
+                for (i in 0 until rows.size) {
+                    val row = rows[i]
+                    val cols = row.select("th")
+
+                    val group = cols[0].text()
+                    val date = cols[1].text()
+                    val subst = Substitution(
+                            group = group,
+                            date = date,
+                            time = cols[2].text(),
+                            course = cols[3].text(),
+                            room = cols[4].text(),
+                            additional = cols[5].text(),
+                            teacher = cols[6].text(),
+                            type = cols[7].text(),
+                            priority = SubstUtil.assignRanking(group, (date.length > 2 && date.substring(0, 3) == "psa")), // TODO make fancier pls
+                            date_priority = SubstUtil.assignDatePriority(date),
+                            website_priority = i
+                    )
+                    if (caller == Caller.JOBSERVICE && prefs.getBoolean("notif", true)) {
+                        if (subst.checkIfPersonal(classPreference, coursePreference)) {
+                            substArray.add(subst)
+                        }
+                    }
+                    insert(subst)
+                }
+                var countOfNotificationItems = 0
+                var countOfMoreNotificationItems = 0
+                if (caller == Caller.JOBSERVICE && prefs.getBoolean("notif", true)) {
+                    substArray.forEach { substItem ->
+                        if (countOfNotificationItems < 4) {
+                            notificationText += ("${
+                            if (notificationText.isNotEmpty()) ",\n" else ""
+                            }${substItem.course}: ${
+                            if (substItem.additional.isNotEmpty()) substItem.additional else if (substItem.type.isNotEmpty()) substItem.type else "---"
+                            }")
+                            countOfNotificationItems += 1
+                        } else {
+                            countOfMoreNotificationItems += 1
+                        }
+                    }
+                    if (countOfMoreNotificationItems > 0) {
+                        notificationText += application.resources.getQuantityString(R.plurals.notification_more_messages, countOfMoreNotificationItems, countOfMoreNotificationItems)
+                    }
+                }
+                prefs.putAndApplyString("timeNew", currentTime)
+                hasUpdated = true
+            }
+            return Pair(notificationText, hasUpdated)
+        }
+        fun requestFoodMenuData(url: String): Boolean {
+            val docFood = Jsoup.connect(url).get()
+            val currentFoodTime = docFood.select("h1")[0].text()
+            return if (currentFoodTime != prefs.getString("newFoodTime", "")) {
+                val foodElements = docFood.select("th")
+                deleteAllFoodItems()
+
+                val indices = ArrayList<Int>()
+                val daysAndVon = arrayOf("montag", "dienstag", "mittwoch", "donnerstag", "freitag", "von", "wünschen")
+                for (i in 0 until foodElements.size) {
+                    if (SubstUtil.checkStringForArray(foodElements[i].text(), daysAndVon, true)) indices.add(i)
+                }
+                indices.add(foodElements.size)
+
+                for (l in 0 until indices.size - 1) {
+                    var s = ""
+                    for (i2 in indices[l] until indices[l + 1]) {
+                        if (s.isEmpty()) {
+                            s = foodElements[i2].text()
+                        } else {
+                            s += "\n${foodElements[i2].text()}"
+                        }
+                    }
+                    insert(Food(s, l))
+                }
+                prefs.putAndApplyString("newFoodTime", currentFoodTime)
+                true
+            } else {
+                false
+            }
+        }
+        fun sendNotification(notificationText: String) {
+            val openApp = Intent(application, Main::class.java)
+            openApp.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+            openApp.flags += Intent.FLAG_ACTIVITY_CLEAR_TASK
+            val openAppPending = PendingIntent.getActivity(application, 0, openApp, 0)
+
+            val notificationLayout = RemoteViews(application.packageName, R.layout.notification)
+            notificationLayout.setTextViewText(R.id.notification_title, application.getString(
+                    R.string.substitution_plan
+            ))
+            notificationLayout.setTextViewText(R.id.notification_textview, notificationText)
+
+            val manager = application.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                SubstUtil.getNotificationChannel(application, prefs)
+            }
+
+            val notification = NotificationCompat.Builder(application, SubstUtil.notificationChannelId)
+                    .setStyle(NotificationCompat.DecoratedCustomViewStyle())
+                    .setCustomContentView(notificationLayout)
+                    .setContentIntent(openAppPending)
+                    .setAutoCancel(true)
+                    .setColor(ContextCompat.getColor(application, R.color.colorAccent))
+                    .setSmallIcon(
+                            if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) R.drawable.ic_avh else R.drawable.ic_avhlogo
+                    )
+
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+                val sound = if (prefs.getNonNullString("ringtoneUri").isNotEmpty()) {
+                    Uri.parse(prefs.getNonNullString("ringtoneUri"))
+                } else {
+                    RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
+                }
+                notification.setSound(sound)
+            }
+
+            manager.notify(1, notification.build())
+        }
+
+        val urlPair = when {
+            prefs.getBoolean("testUrls", false) -> Pair(
+                    "https://djd4rkn355.github.io/subst_test.html",
+                    "https://djd4rkn355.github.io/food_test.html"
+            )
+            prefs.getNonNullString("custom_test_url").isNotEmpty() -> Pair(
+                    "https://djd4rkn355.github.io/${prefs.getString("custom_test_url", "")}",
+                    "https://djd4rkn355.github.io/food.html"
+            )
+            else -> Pair(
+                    "https://djd4rkn355.github.io/avh_substitutions.html",
+                    "https://djd4rkn355.github.io/food.html"
+            )
+        }
+
+        var error = false
+        val returnText = try {
+            val foodMenuHasUpdated = requestFoodMenuData(urlPair.second)
+            val planResult = requestSubstPlan(urlPair.first)
+
+            val notificationText = planResult.first
+            val planHasUpdated = planResult.second
+
+            if (caller == Caller.JOBSERVICE && notificationText.isNotEmpty()) {
+                sendNotification(notificationText)
+            }
+            when (caller) {
+                Caller.SUBSTITUTION -> {
+                    if (planHasUpdated) {
+                        application.getString(R.string.plan_updated)
+                    } else {
+                        "${application.getString(R.string.last_updated)} ${prefs.getNonNullString("timeNew")}"
+                    }
+                }
+                Caller.FOODMENU -> {
+                    if (foodMenuHasUpdated) {
+                        application.getString(R.string.food_menu_updated)
+                    } else {
+                        "${application.getString(R.string.last_updated)} ${prefs.getNonNullString("newFoodTime")}"
+                    }
+                }
+                Caller.SETTINGS -> application.getString(R.string.force_refresh_successful)
+                else -> ""
+            }
+        } catch (e: Exception) {
+            error = true
+            prefs.putAndApplyString("debug_recent_exception", Log.getStackTraceString(e))
+            application.getString(R.string.an_error_occurred)
+        }
+        return Pair(returnText, error)
+    }
+
+    fun fetchDataOnline(caller: Caller): Pair<String, Boolean> {
+        return getData(caller)
     }
 }

app/src/main/java/com/denizd/substitutionplan/database/SubstViewModel.kt

@@ -1,34 +0,0 @@
-package com.denizd.substitutionplan.database
-
-import android.app.Application
-import android.view.View
-import androidx.lifecycle.AndroidViewModel
-import androidx.lifecycle.LiveData
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import com.denizd.substitutionplan.data.DataFetcher
-import com.denizd.substitutionplan.models.Substitution
-
-internal class SubstViewModel(application: Application) : AndroidViewModel(application) {
-
-    private val repository: SubstRepository = SubstRepository(application)
-    val allSubstitutionsSorted: LiveData<List<Substitution>>?
-    val allSubstitutionsOriginal: LiveData<List<Substitution>>?
-    private val app = application
-
-    init {
-        allSubstitutionsSorted = repository.allSubstitutionsSorted
-        allSubstitutionsOriginal = repository.allSubstitutionsOriginal
-    }
-
-    fun refresh(swipeRefreshLayout: SwipeRefreshLayout, rootView: View, refreshMenu: Boolean) {
-        swipeRefreshLayout.isRefreshing = true
-        DataFetcher(
-            isPlan = true,
-            isMenu = refreshMenu,
-            isJobService = false,
-            context = app,
-            application = app,
-            parentView = rootView
-        ).execute()
-    }
-}

app/src/main/java/com/denizd/substitutionplan/fragments/FoodFragment.kt

@@ -1,36 +1,29 @@
 package com.denizd.substitutionplan.fragments
 
-import android.content.Context
-import android.content.SharedPreferences
 import android.os.Bundle
-import androidx.preference.PreferenceManager
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProviders
 import androidx.recyclerview.widget.GridLayoutManager
+import com.denizd.substitutionplan.R
 import com.denizd.substitutionplan.adapters.FoodAdapter
-import com.denizd.substitutionplan.data.SubstUtil
-import com.denizd.substitutionplan.database.FoodViewModel
+import com.denizd.substitutionplan.viewmodels.FoodViewModel
 import com.denizd.substitutionplan.databinding.FoodLayoutBinding
 import com.denizd.substitutionplan.models.Food
+import com.google.android.material.snackbar.Snackbar
 
 internal class FoodFragment : Fragment() {
 
     private val mAdapter = FoodAdapter(ArrayList())
-    private lateinit var mContext: Context
-    private lateinit var prefs: SharedPreferences
-    private lateinit var foodViewModel: FoodViewModel
+    private lateinit var viewModel: FoodViewModel
 
     private lateinit var binding: FoodLayoutBinding
-
-    override fun onAttach(context: Context) {
-        super.onAttach(context)
-        mContext = context
-        prefs = PreferenceManager.getDefaultSharedPreferences(mContext)
-    }
+    private lateinit var snackBarContainer: CoordinatorLayout
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         binding = FoodLayoutBinding.inflate(inflater, container, false)
@@ -40,28 +33,41 @@ internal class FoodFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
+        snackBarContainer = view.rootView.findViewById(R.id.coordination) // TODO replace findViewById with ViewBinding
+
         binding.recyclerView.apply {
             hasFixedSize()
-            layoutManager = GridLayoutManager(mContext, 1)
+            layoutManager = GridLayoutManager(requireContext(), 1)
             adapter = mAdapter
         }
 
-        foodViewModel = ViewModelProviders.of(this).get(FoodViewModel::class.java)
-        foodViewModel.allFoods?.observe(this, Observer<List<Food>> { foodList ->
+        viewModel = ViewModelProviders.of(this).get(FoodViewModel::class.java)
+        viewModel.allFoodItems?.observe(this, Observer<List<Food>> { foodList ->
             binding.recyclerView.scheduleLayoutAnimation()
             mAdapter.setFood(if (foodList.isEmpty()) {
-                SubstUtil.getEmptyFoodMenu(mContext)
+                viewModel.emptyFoodMenu
             } else {
                 foodList
             })
         })
 
-        if (prefs.getBoolean("autoRefresh", false)) {
-            foodViewModel.refresh(swipeRefreshLayout = binding.swipeRefreshLayout, rootView = view.rootView)
+        if (viewModel.shouldAutoRefresh) {
+            refreshAndDisplaySnackBar()
         }
 
         binding.swipeRefreshLayout.setOnRefreshListener {
-            foodViewModel.refresh(swipeRefreshLayout = binding.swipeRefreshLayout, rootView = view.rootView)
+            refreshAndDisplaySnackBar()
+        }
+    }
+
+    private fun refreshAndDisplaySnackBar() {
+        viewModel.refresh { result, error ->
+            val snackBar = Snackbar.make(snackBarContainer, result, Snackbar.LENGTH_LONG)
+            if (error) {
+                snackBar.setBackgroundTint(ContextCompat.getColor(requireContext(), R.color.colorError))
+            }
+            snackBar.show()
+            binding.swipeRefreshLayout.isRefreshing = false
         }
     }
 }

app/src/main/java/com/denizd/substitutionplan/fragments/GeneralPlanFragment.kt

@@ -3,7 +3,6 @@ package com.denizd.substitutionplan.fragments
 import android.os.Bundle
 import android.view.View
 import androidx.lifecycle.Observer
-import com.denizd.substitutionplan.data.SubstUtil
 import com.denizd.substitutionplan.models.Substitution
 
 internal class GeneralPlanFragment : PlanFragment() {
@@ -13,7 +12,7 @@ internal class GeneralPlanFragment : PlanFragment() {
 
         substitutionPlan?.observe(this, Observer<List<Substitution>> { substitutions ->
             mAdapter.setSubst(if (substitutions.isEmpty()) {
-                SubstUtil.getEmptyGeneralSubstitution(mContext)
+                viewModel.emptyGeneralPlan
             } else {
                 substitutions
             })

app/src/main/java/com/denizd/substitutionplan/fragments/PersonalPlanFragment.kt

@@ -3,7 +3,6 @@ package com.denizd.substitutionplan.fragments
 import android.os.Bundle
 import android.view.View
 import androidx.lifecycle.Observer
-import com.denizd.substitutionplan.data.SubstUtil
 import com.denizd.substitutionplan.models.Substitution
 
 internal class PersonalPlanFragment : PlanFragment() {
@@ -11,30 +10,28 @@ internal class PersonalPlanFragment : PlanFragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        val coursePreference = prefs.getString("courses", "") ?: ""
-        val classPreference = prefs.getString("classes", "") ?: ""
+        val coursePreference = viewModel.getNonNullString("courses")
+        val classPreference = viewModel.getNonNullString("classes")
 
         substitutionPlan?.observe(this, Observer<List<Substitution>> { substitutions ->
-            planCardList.clear()
-            isPersonalPlanEmpty = true
-            binding.recyclerView.visibility = View.VISIBLE
+            val list = ArrayList<Substitution>()
 
             substitutions.filter { substItem ->
-                SubstUtil.checkPersonalSubstitutions(
+                viewModel.checkIfSubstitutionPersonal(
                     substItem,
-                    coursePreference,
                     classPreference,
+                    coursePreference,
                     true
                 )
             }.forEach { substItem ->
-                planCardList.add(substItem)
+                list.add(substItem)
             }
-            isPersonalPlanEmpty = (planCardList.size == 1 && planCardList[0].date.substring(0, 3) == "psa") || planCardList.isEmpty()
+            val isPersonalPlanEmpty = (list.size == 1 && list[0].date.substring(0, 3) == "psa") || list.isEmpty()
             if (isPersonalPlanEmpty) {
-                planCardList.add(SubstUtil.getEmptyPersonalSubstitution(mContext))
+                list.add(viewModel.emptyPersonalSubstitution)
             }
             binding.recyclerView.scheduleLayoutAnimation()
-            mAdapter.setSubst(planCardList)
+            mAdapter.setSubst(list)
         })
     }
 }

app/src/main/java/com/denizd/substitutionplan/fragments/PlanFragment.kt

@@ -1,43 +1,33 @@
 package com.denizd.substitutionplan.fragments
 
-import android.content.Context
-import android.content.SharedPreferences
 import android.content.res.Configuration
 import android.os.Bundle
-import android.os.Handler
-import androidx.preference.PreferenceManager
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.ViewModelProviders
 import androidx.recyclerview.widget.GridLayoutManager
 import com.denizd.substitutionplan.R
 import com.denizd.substitutionplan.adapters.SubstitutionAdapter
-import com.denizd.substitutionplan.database.SubstViewModel
+import com.denizd.substitutionplan.viewmodels.SubstViewModel
 import com.denizd.substitutionplan.databinding.PlanBinding
 import com.denizd.substitutionplan.models.Substitution
+import com.google.android.material.snackbar.Snackbar
 import kotlin.collections.ArrayList
 
 internal open class PlanFragment : Fragment() {
-    internal lateinit var mAdapter: SubstitutionAdapter
-    internal var planCardList = ArrayList<Substitution>()
-    private lateinit var substViewModel: SubstViewModel
-    internal lateinit var mContext: Context
-    internal lateinit var prefs: SharedPreferences
 
-    internal var isPersonalPlanEmpty: Boolean = true
-    internal val handler = Handler()
-    internal var substitutionPlan: LiveData<List<Substitution>>? = null
-
-    internal lateinit var binding: PlanBinding
-
-    override fun onAttach(context: Context) {
-        super.onAttach(context)
-        mContext = context
-        prefs = PreferenceManager.getDefaultSharedPreferences(mContext)
+    internal val mAdapter: SubstitutionAdapter by lazy {
+        SubstitutionAdapter(ArrayList(), viewModel.substitutionPlanColours)
     }
+    lateinit var viewModel: SubstViewModel
+    internal var substitutionPlan: LiveData<List<Substitution>>? = null
+    internal lateinit var binding: PlanBinding
+    private lateinit var snackBarContainer: CoordinatorLayout
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         binding = PlanBinding.inflate(inflater, container, false)
@@ -46,51 +36,50 @@ internal open class PlanFragment : Fragment() {
 
     override fun onConfigurationChanged(newConfig: Configuration) {
         super.onConfigurationChanged(newConfig)
-        binding.recyclerView.layoutManager = GridLayoutManager(mContext, getGridColumnCount(newConfig))
+        binding.recyclerView.layoutManager = GridLayoutManager(requireContext(), viewModel.getGridColumnCount(newConfig))
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        substViewModel = ViewModelProviders.of(this).get(SubstViewModel::class.java)
-        substitutionPlan = if (prefs.getBoolean("app_specific_sorting", true)) {
-            substViewModel.allSubstitutionsSorted
+
+        snackBarContainer = view.rootView.findViewById(R.id.coordination) // TODO replace findViewById with ViewBinding
+
+        viewModel = ViewModelProviders.of(this).get(SubstViewModel::class.java)
+        substitutionPlan = if (viewModel.shouldUseAppSorting) {
+            viewModel.allSubstitutionsSorted
         } else {
-            substViewModel.allSubstitutionsOriginal
+            viewModel.allSubstitutionsOriginal
         }
 
-        mAdapter = SubstitutionAdapter(planCardList, prefs)
         binding.recyclerView.apply {
             hasFixedSize()
-            layoutManager = GridLayoutManager(mContext, getGridColumnCount(resources.configuration))
+            layoutManager = GridLayoutManager(requireContext(), viewModel.getGridColumnCount(resources.configuration))
             adapter = mAdapter
         }
 
-        if (prefs.getInt("firstTimeOpening", 0) == 1) {
-            substViewModel.refresh(swipeRefreshLayout = binding.swipeRefreshLayout, rootView = view.rootView, refreshMenu = true)
-            prefs.edit().putInt("firstTimeOpening", 2).apply()
-        }
+        // TODO figure something out
+//        if (prefs.getInt("firstTimeOpening", 0) == 1) {
+//            refreshAndDisplaySnackBar()
+//            prefs.edit().putInt("firstTimeOpening", 2).apply()
+//        }
 
-        if (prefs.getBoolean("autoRefresh", false)) {
-            substViewModel.refresh(swipeRefreshLayout = binding.swipeRefreshLayout, rootView = view.rootView, refreshMenu = false)
+        if (viewModel.shouldAutoRefresh) {
+            refreshAndDisplaySnackBar()
         }
 
         binding.swipeRefreshLayout.setOnRefreshListener {
-            substViewModel.refresh(swipeRefreshLayout = binding.swipeRefreshLayout, rootView = view.rootView, refreshMenu = false)
+            refreshAndDisplaySnackBar()
         }
     }
 
-    private fun getGridColumnCount(config: Configuration): Int {
-        val tabletSize = resources.getBoolean(R.bool.isTablet)
-        return if (tabletSize) {
-            when (config.orientation) {
-                Configuration.ORIENTATION_PORTRAIT -> 2
-                else -> 3
-            }
-        } else {
-            when (config.orientation) {
-                Configuration.ORIENTATION_PORTRAIT -> 1
-                else -> 2
+    private fun refreshAndDisplaySnackBar() {
+        viewModel.refresh { result, error ->
+            val snackBar = Snackbar.make(snackBarContainer, result, Snackbar.LENGTH_LONG)
+            if (error) {
+                snackBar.setBackgroundTint(ContextCompat.getColor(requireContext(), R.color.colorError)) // TODO check if requireContext() is dangerous ;(
             }
+            snackBar.show()
+            binding.swipeRefreshLayout.isRefreshing = false
         }
     }
 }

app/src/main/java/com/denizd/substitutionplan/fragments/SettingsFragment.kt

@@ -5,8 +5,6 @@ import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
 import android.content.SharedPreferences
-import android.database.Cursor
-import android.media.RingtoneManager
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
@@ -17,25 +15,23 @@ import android.text.TextWatcher
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.view.Window
 import android.widget.*
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.browser.customtabs.CustomTabsIntent
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.denizd.substitutionplan.*
 import com.denizd.substitutionplan.adapters.ColourPickerAdapter
 import com.denizd.substitutionplan.adapters.CourseColourAdapter
 import com.denizd.substitutionplan.adapters.RingtoneAdapter
-import com.denizd.substitutionplan.data.DataFetcher
 import com.denizd.substitutionplan.data.SubstUtil
-import com.denizd.substitutionplan.data.Topic
 import com.denizd.substitutionplan.databinding.ContentSettingsBinding
 import com.denizd.substitutionplan.models.Colour
-import com.denizd.substitutionplan.models.Ringtone
+import com.denizd.substitutionplan.viewmodels.SettingsViewModel
 import com.google.android.material.bottomnavigation.BottomNavigationView
 import com.google.android.material.button.MaterialButton
 import com.google.firebase.messaging.FirebaseMessaging
@@ -48,28 +44,21 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
     private lateinit var mContext: Context
     private lateinit var prefs: SharedPreferences
     private val customTabsIntent = CustomTabsIntent.Builder().build() as CustomTabsIntent
-    private var window: Window? = null
-    private var longPressed = false
+    private var customiseColoursButtonLongPressed = false
     private var versionCount = 0
     private var currentCourseSelectedInColourPicker = ""
 
-    private val ringtones: List<Ringtone> by lazy {
-        getRingtones()
-    }
-
     private lateinit var colourRecycler: RecyclerView
     private lateinit var ringtoneDialog: AlertDialog
     private lateinit var colourPickerDialog: AlertDialog
 
     private lateinit var binding: ContentSettingsBinding
-    private lateinit var textCustomiseColoursTitle: TextView
-    private lateinit var textCustomiseColoursDesc: TextView
+    private lateinit var viewModel: SettingsViewModel
 
     override fun onAttach(context: Context) {
         super.onAttach(context)
         mContext = context
         prefs = PreferenceManager.getDefaultSharedPreferences(mContext)
-        window = activity?.window
     }
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
@@ -80,12 +69,11 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
+        viewModel = ViewModelProviders.of(this)[SettingsViewModel::class.java]
+
         binding.apply {
             val thisFragment = this@SettingsFragment
 
-            thisFragment.textCustomiseColoursTitle = textCustomiseColoursTitle
-            thisFragment.textCustomiseColoursDesc = textCustomiseColoursDesc
-
             // Set text
             setRingtoneText()
 
@@ -174,15 +162,15 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
                         AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                         if (Build.VERSION.SDK_INT in 23..28) {
                             @SuppressLint("InlinedApi")
-                            window?.decorView?.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
-                            window?.navigationBarColor = ContextCompat.getColor(mContext, R.color.colorBackground)
+                            activity?.window?.decorView?.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+                            activity?.window?.navigationBarColor = ContextCompat.getColor(mContext, R.color.colorBackground)
                         }
                     }
                     2 -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM) // only accessible on API 28+
                     else -> {
                         AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                         if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.P) {
-                            window?.navigationBarColor = ContextCompat.getColor(mContext, R.color.colorBackground)
+                            activity?.window?.navigationBarColor = ContextCompat.getColor(mContext, R.color.colorBackground)
                         }
                     }
                 }
@@ -219,14 +207,14 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
             R.id.button_courses_help -> createDialog(getString(R.string.courses_help_dialog_title), getString(R.string.courses_help_dialog_text))
             R.id.button_order_help -> createDialog(getString(R.string.ordering_systems_dialog_title), getString(R.string.ordering_systems_dialog_text))
             R.id.button_forced_refresh -> {
-                DataFetcher(
-                        isPlan = true,
-                        isMenu = true,
-                        forced = true,
-                        context = mContext,
-                        application = activity!!.application,
-                        parentView = view!!.rootView
-                ).execute()
+//                val repo = SubstRepository(activity?.application!!)
+//                repo.putAndApplyString("timeNew", "")
+//                repo.putAndApplyString("newFoodTime", "")
+//                repo.fetchDataOnline(Caller.SETTINGS)
+                // TODO needs async
+                // TODO put in viewModel
+                // TODO create viewModel
+                // TODO remove TODOs
             }
             R.id.button_visit_website -> {
                 try {
@@ -250,14 +238,14 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
     override fun onLongClick(v: View?): Boolean {
         return when (v?.id) {
             R.id.button_customise_colours -> {
-                if (!longPressed) {
-                    textCustomiseColoursTitle.text = getString(R.string.made_by_deniz)
-                    textCustomiseColoursDesc.text = getString(R.string.thanks_for_using)
+                if (!customiseColoursButtonLongPressed) {
+                    binding.textCustomiseColoursTitle.text = getString(R.string.made_by_deniz)
+                    binding.textCustomiseColoursDesc.text = getString(R.string.thanks_for_using)
                 } else {
-                    textCustomiseColoursTitle.text = getString(R.string.customise_colours_title)
-                    textCustomiseColoursDesc.text = getString(R.string.customise_colours_desc)
+                    binding.textCustomiseColoursTitle.text = getString(R.string.customise_colours_title)
+                    binding.textCustomiseColoursDesc.text = getString(R.string.customise_colours_desc)
                 }
-                longPressed = !longPressed
+                customiseColoursButtonLongPressed = !customiseColoursButtonLongPressed
                 true
             }
             R.id.button_courses_help -> {
@@ -298,9 +286,9 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
                 R.id.switch_notifications -> {
                     prefs.edit().putBoolean("notif", isChecked).apply()
                     if (isChecked) {
-                        subscribeToTopic(Topic.ANDROID)
+                        subscribeToTopic(SubstUtil.FB_TOPIC_ANDROID)
                     } else {
-                        unsubscribeFromTopic(Topic.ANDROID)
+                        unsubscribeFromTopic(SubstUtil.FB_TOPIC_ANDROID)
                     }
                 }
                 R.id.switch_personalised_plan -> {
@@ -389,11 +377,14 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
             val titleText = dialogView.findViewById<TextView>(R.id.empty_textviewtitle)
             titleText.text = getString(R.string.pick_ringtone_dialog_title)
 
-            val recycler = dialogView.findViewById<RecyclerView>(R.id.recyclerView)
-            recycler.apply {
+            dialogView.findViewById<RecyclerView>(R.id.recyclerView).apply {
                 hasFixedSize()
                 layoutManager = GridLayoutManager(mContext, 1)
-                adapter = RingtoneAdapter(ringtones, this@SettingsFragment)
+                if (!viewModel.ringtonesInitialised) {
+                    viewModel.getRingtones {
+                        adapter = RingtoneAdapter(viewModel.ringtones, this@SettingsFragment)
+                    }
+                }
             }
 
             ringtoneDialog = ringtoneCustomiserBuilder.setView(dialogView).create()
@@ -464,10 +455,10 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
                     }
                     this == "_devchannel" -> {
                         val subbed = if (prefs.getBoolean("subscribedToFBDebugChannel", false)) {
-                            unsubscribeFromTopic(Topic.DEVELOPMENT)
+                            unsubscribeFromTopic(SubstUtil.FB_TOPIC_DEVELOPMENT)
                             "Unsubscribed from"
                         } else {
-                            subscribeToTopic(Topic.DEVELOPMENT)
+                            subscribeToTopic(SubstUtil.FB_TOPIC_DEVELOPMENT)
                             "Subscribed to"
                         }
                         prefs.edit().putBoolean("subscribedToFBDebugChannel", !prefs.getBoolean("subscribedToFBDebugChannel", false)).apply()
@@ -475,10 +466,10 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
                     }
                     this == "_ioschannel" -> {
                         val subbed = if (prefs.getBoolean("subscribedToiOSChannel", false)) {
-                            unsubscribeFromTopic(Topic.IOS)
+                            unsubscribeFromTopic(SubstUtil.FB_TOPIC_IOS)
                             "Unsubscribed from"
                         } else {
-                            subscribeToTopic(Topic.IOS)
+                            subscribeToTopic(SubstUtil.FB_TOPIC_IOS)
                             "Subscribed to"
                         }
                         prefs.edit().putBoolean("subscribedToiOSChannel", !prefs.getBoolean("subscribedToiOSChannel", false)).apply()
@@ -570,26 +561,6 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
         return colours
     }
 
-    private fun getRingtones(): ArrayList<Ringtone> {
-        lateinit var ringtoneCursor: Cursor
-        val ringtoneManager = RingtoneManager(activity).apply {
-            setType(RingtoneManager.TYPE_NOTIFICATION)
-            ringtoneCursor = cursor
-        }
-        val alarms = ArrayList<Ringtone>()
-
-        while (!ringtoneCursor.isAfterLast && ringtoneCursor.moveToNext()) {
-            val position = ringtoneCursor.position
-            alarms.add(
-                Ringtone(
-                    ringtoneManager.getRingtone(position).getTitle(mContext),
-                    ringtoneManager.getRingtoneUri(position).toString()
-                )
-            )
-        }
-        return alarms
-    }
-
     // Functions for handling other things
     private fun setRingtoneText() {
         binding.textCustomiseRingtoneDesc.text = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
@@ -620,16 +591,20 @@ internal class SettingsFragment : Fragment(), View.OnClickListener, View.OnLongC
                 "\n\nSubscribed to dev channel: ${prefs.getBoolean("subscribedToFBDebugChannel", false)}"
     }
 
-    private fun subscribeToTopic(topic: Topic) = FirebaseMessaging.getInstance().subscribeToTopic(topic.tag)
-    private fun unsubscribeFromTopic(topic: Topic) = FirebaseMessaging.getInstance().unsubscribeFromTopic(topic.tag)
+    private fun subscribeToTopic(topic: String) = FirebaseMessaging.getInstance().subscribeToTopic(topic)
+    private fun unsubscribeFromTopic(topic: String) = FirebaseMessaging.getInstance().unsubscribeFromTopic(topic)
 
     // Below this point follow string literals that I didn't bother putting in /res/values/strings
 
-    private val licences = "Libraries:" +
-            "\n • jsoup HTML parser © 2009-2018 Jonathan Hedley, licensed under the open source MIT Licence" +
-            "\n\nFont:" +
-            "\n • Manrope © 2018-2019 Michael Sharanda, licensed under the SIL Open Font Licence 1.1" +
-            "\n\nIcons:" +
-            "\n • bqlqn\n • fjstudio\n • Freepik\n • Smashicons" +
-            "\n • © 2013-2019 Freepik Company S.L., licensed under Creative Commons BY 3.0"
+    // TODO check if this is displayed properly
+    private val licences = """Libraries:
+                               • jsoup HTML parser © 2009-2018 Jonathan Hedley, licensed under the open source MIT Licence
+                              Font:
+                               • Manrope © 2018-2019 Michael Sharanda, licensed under the SIL Open Font Licence 1.1
+                              Icons:
+                               • bqlqn
+                               • fjstudio
+                               • Freepik
+                               • Smashicons
+                               • © 2013-2019 Freepik Company S.L., licensed under Creative Commons BY 3.0""".trimIndent()
 }

app/src/main/java/com/denizd/substitutionplan/services/FBNotificationService.kt

@@ -1,7 +1,8 @@
 package com.denizd.substitutionplan.services
 
 import android.annotation.SuppressLint
-import com.denizd.substitutionplan.data.DataFetcher
+import com.denizd.substitutionplan.data.Caller
+import com.denizd.substitutionplan.database.SubstRepository
 import com.google.firebase.messaging.FirebaseMessagingService
 import com.google.firebase.messaging.RemoteMessage
 
@@ -13,13 +14,6 @@ import com.google.firebase.messaging.RemoteMessage
 internal class FBNotificationService : FirebaseMessagingService() {
 
     override fun onMessageReceived(p0: RemoteMessage) {
-        DataFetcher(
-            isPlan = true,
-            isMenu = true,
-            isJobService = true,
-            context = applicationContext,
-            application = application,
-            parentView = null
-        ).execute()
+        SubstRepository(application).fetchDataOnline(Caller.JOBSERVICE)
     }
 }

app/src/main/java/com/denizd/substitutionplan/services/FBPingService.kt

@@ -3,7 +3,7 @@ package com.denizd.substitutionplan.services
 import android.app.job.JobParameters
 import android.app.job.JobService
 import androidx.preference.PreferenceManager
-import com.denizd.substitutionplan.data.Topic
+import com.denizd.substitutionplan.data.SubstUtil
 import com.google.firebase.FirebaseApp
 import com.google.firebase.messaging.FirebaseMessaging
 
@@ -35,24 +35,24 @@ internal class FBPingService : JobService() {
         if (!prefs.getBoolean("firstTime", true)) {
             FirebaseMessaging.getInstance().apply {
                 if (prefs.getBoolean("notif", true)) {
-                    subscribeToTopic(Topic.ANDROID.tag)
+                    subscribeToTopic(SubstUtil.FB_TOPIC_ANDROID)
                 } else {
-                    unsubscribeFromTopic(Topic.ANDROID.tag)
+                    unsubscribeFromTopic(SubstUtil.FB_TOPIC_ANDROID)
                 }
 
                 if (prefs.getBoolean("subscribedToFBDebugChannel", false)) {
-                    subscribeToTopic(Topic.DEVELOPMENT.tag)
+                    subscribeToTopic(SubstUtil.FB_TOPIC_DEVELOPMENT)
                 } else {
-                    unsubscribeFromTopic(Topic.DEVELOPMENT.tag)
+                    unsubscribeFromTopic(SubstUtil.FB_TOPIC_DEVELOPMENT)
                 }
 
                 if (prefs.getBoolean("subscribedToiOSChannel", false)) {
-                    subscribeToTopic(Topic.IOS.tag)
+                    subscribeToTopic(SubstUtil.FB_TOPIC_IOS)
                 } else {
-                    unsubscribeFromTopic(Topic.IOS.tag)
+                    unsubscribeFromTopic(SubstUtil.FB_TOPIC_IOS)
                 }
 
-                subscribeToTopic(Topic.BROADCAST.tag)
+                subscribeToTopic(SubstUtil.FB_TOPIC_BROADCAST)
 
                 prefs.edit().putInt("pingFB", prefs.getInt("pingFB", 0) + 1).apply()
             }

app/src/main/java/com/denizd/substitutionplan/viewmodels/FoodViewModel.kt

@@ -0,0 +1,31 @@
+package com.denizd.substitutionplan.viewmodels
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import com.denizd.substitutionplan.data.Caller
+import com.denizd.substitutionplan.database.SubstRepository
+import com.denizd.substitutionplan.models.Food
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+
+internal class FoodViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val repo = SubstRepository(application)
+    val allFoodItems: LiveData<List<Food>>?
+    val emptyFoodMenu = repo.emptyFoodMenu
+    val shouldAutoRefresh = repo.shouldAutoRefresh
+
+    init {
+        allFoodItems = repo.allFoodItems
+    }
+
+    fun refresh(updateUi: (result: String, error: Boolean) -> Unit)  {
+        GlobalScope.launch {
+            val task = GlobalScope.async { repo.fetchDataOnline(Caller.FOODMENU) }
+            val result = task.await()
+            updateUi(result.first, result.second)
+        }
+    }
+}

app/src/main/java/com/denizd/substitutionplan/viewmodels/SettingsViewModel.kt

@@ -0,0 +1,25 @@
+package com.denizd.substitutionplan.viewmodels
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import com.denizd.substitutionplan.database.SettingsRepository
+import com.denizd.substitutionplan.models.Ringtone
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+
+internal class SettingsViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val repo = SettingsRepository(application)
+
+    lateinit var ringtones: List<Ringtone>
+    val ringtonesInitialised = ::ringtones.isInitialized
+
+    fun getRingtones(updateUi: () -> Unit) {
+        GlobalScope.launch {
+            val task = GlobalScope.async { repo.ringtones }
+            ringtones = task.await()
+            updateUi()
+        }
+    }
+}

app/src/main/java/com/denizd/substitutionplan/viewmodels/SubstViewModel.kt

@@ -0,0 +1,47 @@
+package com.denizd.substitutionplan.viewmodels
+
+import android.app.Application
+import android.content.res.Configuration
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import com.denizd.substitutionplan.data.Caller
+import com.denizd.substitutionplan.database.SubstRepository
+import com.denizd.substitutionplan.models.Substitution
+import kotlinx.coroutines.*
+
+internal class SubstViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val repo = SubstRepository(application)
+    val allSubstitutionsSorted: LiveData<List<Substitution>>?
+    val allSubstitutionsOriginal: LiveData<List<Substitution>>?
+    val substitutionPlanColours = repo.substitutionPlanColours
+    val shouldAutoRefresh = repo.shouldAutoRefresh
+    val shouldUseAppSorting = repo.shouldUseAppSorting
+    val emptyGeneralPlan = repo.emptyGeneralPlan
+    val emptyPersonalSubstitution = repo.emptyPersonalSubstitution
+
+    init {
+        allSubstitutionsSorted = repo.allSubstitutionsSorted
+        allSubstitutionsOriginal = repo.allSubstitutionsOriginal
+    }
+
+    fun getNonNullString(key: String): String {
+        return repo.externalNonNullString(key)
+    }
+
+    fun checkIfSubstitutionPersonal(substitution: Substitution, classPreference: String, coursePreference: String, includesPsa: Boolean): Boolean {
+        return repo.checkIfSubstitutionPersonal(substitution, classPreference, coursePreference, includesPsa)
+    }
+
+    fun getGridColumnCount(config: Configuration): Int {
+        return repo.getGridColumnCount(config)
+    }
+
+    fun refresh(updateUi: (result: String, error: Boolean) -> Unit)  {
+        GlobalScope.launch {
+            val task = GlobalScope.async { repo.fetchDataOnline(Caller.SUBSTITUTION) }
+            val result = task.await()
+            updateUi(result.first, result.second)
+        }
+    }
+}

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

@@ -2,7 +2,7 @@
 <resources>
     <string name="app_name">AvH-Plan</string>
     <string name="filters">Filter</string>
-    <string name="no_internet_connection">Keine Internetverbindung</string>
+    <string name="an_error_occurred">Ein Fehler ist aufgetreten</string>
     <string name="general">Allgemein</string>
     <string name="grade">Klasse</string>
     <string name="courses">Kurse</string>
@@ -192,4 +192,6 @@
         <item>Weiß</item>
         <item>Schwarz</item>
     </string-array>
+    <string name="plan_updated">Der Plan wurde aktualisiert</string>
+    <string name="food_menu_updated">Der Speiseplan wurde aktualisiert</string>
 </resources>

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

@@ -3,7 +3,7 @@
     <string name="app_name">AvH Plan</string>
     <string name="substitution_plan">Substitution Plan</string>
     <string name="filters">Filters</string>
-    <string name="no_internet_connection">No internet connection</string>
+    <string name="an_error_occurred">An error has occurred</string>
     <string name="general">General</string>
     <string name="grade">Grade</string>
     <string name="courses">Courses</string>
@@ -205,4 +205,6 @@
         <item>White</item>
         <item>Black</item>
     </string-array>
+    <string name="plan_updated">The plan has been updated</string>
+    <string name="food_menu_updated">The food menu has been updated</string>
 </resources>