refactored for work with multiple databases. Didn't test yet

app/src/main/java/org/foxarmy/barcodescannerforemployees/DBStorageController.kt

@@ -6,7 +6,11 @@ import android.database.DatabaseUtils
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.provider.BaseColumns
+import android.widget.Toast
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
+import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.dataclasses.Product
 import java.io.File
 
@@ -62,9 +66,16 @@ const val SQL_CREATE_CATEGORIES_TABLE =
             "${BaseColumns._ID} INTEGER PRIMARY KEY," +
             "${CategoriesContract.CategoryEntry.CATEGORY_NAME} TEXT)"
 
-class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {
+class DBStorageController(context: Context, dbname: String) :
+    SQLiteOpenHelper(context, dbname, null, DATABASE_VERSION) {
+
+    private lateinit var dbname: String
+    private lateinit var db: SQLiteDatabase
 
     override fun onCreate(db: SQLiteDatabase) {
+        this.db = db
+        DATABASE_NAME = "$dbname.db"
+
         db.execSQL(SQL_CREATE_ABSTRACT_PRODUCTS_TABLE)
         db.execSQL(SQL_CREATE_PRODUCTS_TABLE)
         db.execSQL(SQL_CREATE_CATEGORIES_TABLE)
@@ -74,24 +85,32 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         TODO("Not yet implemented")
     }
 
-    fun eraseCategory (db: SQLiteDatabase, id: Int, context: Context) {
+    fun eraseCategory(id: Int, context: Context) {
-        val productsInCategory = getAllAbstractProductInCategory(db, id)
+        val productsInCategory = getAllAbstractProductInCategory(id)
 
         for (product in productsInCategory.iterator()) {
-            eraseAbstractProduct(db, product.id, context)
+            eraseAbstractProduct(product.id, context)
         }
 
         db.delete(CategoriesContract.CategoryEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
     }
 
-    fun getCategoryNameById(db: SQLiteDatabase, id: Int) : String {
+    fun getCategoryNameById(id: Int): String {
         var result = ""
 
         val projection = arrayOf(CategoriesContract.CategoryEntry.CATEGORY_NAME)
         val selection = "${BaseColumns._ID} = ?"
         val selectionArgs = arrayOf(id.toString())
 
-        val cursor = db.query(CategoriesContract.CategoryEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor = db.query(
+            CategoriesContract.CategoryEntry.TABLE_NAME,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            null
+        )
 
         with(cursor) {
             while (moveToNext()) {
@@ -102,7 +121,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return result
     }
 
-    fun getAllAbstractProductInCategory(db: SQLiteDatabase, id: Int) : List<AbstractProduct> {
+    fun getAllAbstractProductInCategory(id: Int): List<AbstractProduct> {
 
         var result = mutableListOf<AbstractProduct>()
         val projection = arrayOf(
@@ -117,18 +136,39 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         val selection = "${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?"
         val selectionArgs = arrayOf(id.toString())
 
-        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor = db.query(
+            AbstractProductContract.AbstractProductEntry.TABLE_NAME,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            null
+        )
 
         with(cursor) {
             while (moveToNext()) {
                 val abstractProductId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val abstractProductBarcode = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.BARCODE))
+                val abstractProductBarcode =
-                val abstractProductName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.BARCODE))
-                val abstractProductNetWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val abstractProductName =
-                val abstractProductImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                val abstractProductUnit = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
+                val abstractProductNetWeight =
+                    getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val abstractProductImageHash =
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                val abstractProductUnit =
+                    getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
 
-                val abstractProduct = AbstractProduct(abstractProductId, abstractProductBarcode, abstractProductName, abstractProductNetWeight, abstractProductImageHash, category = id, abstractProductUnit)
+                val abstractProduct = AbstractProduct(
+                    abstractProductId,
+                    abstractProductBarcode,
+                    abstractProductName,
+                    abstractProductNetWeight,
+                    abstractProductImageHash,
+                    category = id,
+                    abstractProductUnit
+                )
 
                 result.add(abstractProduct)
             }
@@ -137,10 +177,15 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return result
     }
 
-    fun getAmountOfAbstractProductsInCategory(db:SQLiteDatabase, id: Int) : Int {
+    fun getAmountOfAbstractProductsInCategory(id: Int): Int {
-        return DatabaseUtils.longForQuery(db, "SELECT COUNT(*) FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?", arrayOf(id.toString())).toInt()
+        return DatabaseUtils.longForQuery(
+            db,
+            "SELECT COUNT(*) FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?",
+            arrayOf(id.toString())
+        ).toInt()
     }
-    fun eraseAbstractProduct(db: SQLiteDatabase, id: Int, context: Context) {
+
+    fun eraseAbstractProduct(id: Int, context: Context) {
         val projectionForAbstractProduct = arrayOf(
             AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME
         )
@@ -160,7 +205,8 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
 
         with(cursorForAbstractProduct) {
             while (moveToNext()) {
-                val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                val productImageHash =
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
                 imageHash = productImageHash
             }
         }
@@ -174,22 +220,30 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         val selectionForProducts = "${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID} = ?"
         val selectionArgsForProducts = arrayOf(id.toString())
 
-        val cursorForProducts = db.query(ProductContract.ProductEntry.TABLE_NAME, projectionForProducts, selectionForProducts, selectionArgsForProducts, null, null, null)
+        val cursorForProducts = db.query(
+            ProductContract.ProductEntry.TABLE_NAME,
+            projectionForProducts,
+            selectionForProducts,
+            selectionArgsForProducts,
+            null,
+            null,
+            null
+        )
 
         with(cursorForProducts) {
             while (moveToNext()) {
-                eraseProduct(db, getInt(getColumnIndexOrThrow(BaseColumns._ID)))
+                eraseProduct(getInt(getColumnIndexOrThrow(BaseColumns._ID)))
             }
         }
 
         db.delete(AbstractProductContract.AbstractProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
     }
 
-    fun eraseProduct(db:SQLiteDatabase, id: Int) {
+    fun eraseProduct(id: Int) {
         db.delete(ProductContract.ProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
     }
 
-    fun insertNewProduct(db: SQLiteDatabase, product: Product) {
+    fun insertNewProduct(product: Product) {
         val values = ContentValues().apply {
             put(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID, product.abstractProductId)
             put(ProductContract.ProductEntry.AMOUNT, product.amount)
@@ -200,7 +254,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         db.insert(ProductContract.ProductEntry.TABLE_NAME, null, values)
     }
 
-    fun findAmountOfProductsWithExpiryDate(db: SQLiteDatabase, date: Long): Int {
+    fun findAmountOfProductsWithExpiryDate(date: Long): Int {
         var amount = 0
 
         val projection = arrayOf(
@@ -212,7 +266,8 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         val selection = "${ProductContract.ProductEntry.EXPIRY_DATE} = ?"
         val selectionArgs = arrayOf(date.toString())
 
-        val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor =
+            db.query(ProductContract.ProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
 
         with(cursor) {
             while (moveToNext()) {
@@ -223,7 +278,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return amount
     }
 
-    fun findAllExpiryDates(db:SQLiteDatabase): Set<Long> {
+    fun findAllExpiryDates(): Set<Long> {
         val dates: MutableSet<Long> = mutableSetOf<Long>()
 
         val projection = arrayOf(
@@ -243,7 +298,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return dates
     }
 
-    fun findAbstractProductByBarcode (db: SQLiteDatabase, barcode: String) : AbstractProduct? {
+    fun findAbstractProductByBarcode(barcode: String): AbstractProduct? {
         var abstractProduct: AbstractProduct? = null
         val projection = arrayOf(
             BaseColumns._ID,
@@ -257,14 +312,25 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         val selection = "${AbstractProductContract.AbstractProductEntry.BARCODE} = ?"
         val selectionArgs = arrayOf(barcode)
 
-        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor = db.query(
+            AbstractProductContract.AbstractProductEntry.TABLE_NAME,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            null
+        )
 
         with(cursor) {
             while (moveToNext()) {
                 val id = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val productName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
+                val productName =
-                val imageFilename = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                val netWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val imageFilename =
+                    getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                val netWeight =
+                    getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
                 val category = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.CATEGORY))
                 val unit = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
 
@@ -275,7 +341,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return abstractProduct
     }
 
-    fun findAbstractProductById(db: SQLiteDatabase, id: Int): AbstractProduct? {
+    fun findAbstractProductById(id: Int): AbstractProduct? {
         var abstractProduct: AbstractProduct? = null
         val projection = arrayOf(
             BaseColumns._ID,
@@ -290,15 +356,25 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         val selection = "${BaseColumns._ID} = ?"
         val selectionArgs = arrayOf(id.toString())
 
-        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor = db.query(
+            AbstractProductContract.AbstractProductEntry.TABLE_NAME,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            null
+        )
 
         with(cursor) {
             while (moveToNext()) {
                 val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
                 val barcode = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.BARCODE))
                 val name = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                val netWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val netWeight =
-                val imageHash = getString((getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME)))
+                    getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val imageHash =
+                    getString((getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME)))
                 val category = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.CATEGORY))
                 val unit = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
 
@@ -309,18 +385,246 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return abstractProduct
     }
 
-    fun updateProduct(db: SQLiteDatabase, product: Product) {
+    fun updateProduct(product: Product) {
         val values = ContentValues().apply {
             put(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID, product.abstractProductId)
             put(ProductContract.ProductEntry.AMOUNT, product.amount)
             put(ProductContract.ProductEntry.DATE_OF_PRODUCTION, product.dateOfProduction)
             put(ProductContract.ProductEntry.EXPIRY_DATE, product.dateOfExpiry)
         }
-        db.update(ProductContract.ProductEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(product.id.toString()))
+        db.update(
+            ProductContract.ProductEntry.TABLE_NAME,
+            values,
+            "${BaseColumns._ID} = ?",
+            arrayOf(product.id.toString())
+        )
+    }
+
+    fun addAbstractProduct(abstractProduct: AbstractProduct, context: Context) {
+        val values = ContentValues().apply {
+            put(AbstractProductContract.AbstractProductEntry.BARCODE, abstractProduct.barcode)
+            put(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME, abstractProduct.name)
+            put(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT, abstractProduct.netWeight.toString())
+            put(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME, abstractProduct.imageHash)
+            put(AbstractProductContract.AbstractProductEntry.CATEGORY, abstractProduct.category)
+            put(AbstractProductContract.AbstractProductEntry.UNIT, abstractProduct.unit)
+        }
+
+        val id = db.insert(AbstractProductContract.AbstractProductEntry.TABLE_NAME, null, values)
+        val n = Net()
+        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+
+        val sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            masterKeyAlias,
+            context,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        n.language = sharedPreferences.getString("language", "en-US")!!
+        n.server = sharedPreferences.getString("server", "")!!
+        n.token = sharedPreferences.getString("token", "")!!
+        val pictureFile = File(File(context.filesDir, "pictures"), "${abstractProduct.imageHash}.png")
+        val response = n.uploadAbstractProduct(1, abstractProduct, pictureFile);
+
+        Toast.makeText(context, response.body!!.string(), Toast.LENGTH_LONG).show()
+    }
+
+    fun updateAbstractProduct(abstractProduct: AbstractProduct, context: Context) {
+        val values = ContentValues().apply {
+            put(AbstractProductContract.AbstractProductEntry.BARCODE, abstractProduct.barcode)
+            put(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME, abstractProduct.name)
+            put(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT, abstractProduct.netWeight.toString())
+            put(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME, abstractProduct.imageHash)
+            put(AbstractProductContract.AbstractProductEntry.CATEGORY, abstractProduct.category)
+            put(AbstractProductContract.AbstractProductEntry.UNIT, abstractProduct.unit)
+        }
+
+        db.update(
+            AbstractProductContract.AbstractProductEntry.TABLE_NAME,
+            values,
+            "${BaseColumns._ID} = ?",
+            arrayOf(abstractProduct.id.toString())
+        )
+    }
+
+    fun getAllCategories(): List<Category> {
+        val categories = mutableListOf<Category>()
+
+        val projection = arrayOf(
+            CategoriesContract.CategoryEntry.CATEGORY_NAME
+        )
+
+        val cursor = db.query(
+            CategoriesContract.CategoryEntry.TABLE_NAME,
+            projection,
+            null,
+            null,
+            null,
+            null,
+            BaseColumns._ID + " ASC"
+        )
+
+        with(cursor) {
+            while (moveToNext()) {
+                val category = Category(
+                    getInt(getColumnIndexOrThrow(BaseColumns._ID)),
+                    getString(getColumnIndexOrThrow(CategoriesContract.CategoryEntry.CATEGORY_NAME))
+                )
+                categories.add(category)
+            }
+        }
+
+        return categories
+    }
+
+    fun addCategory(category: Category) {
+        val values = ContentValues().apply {
+            put(CategoriesContract.CategoryEntry.CATEGORY_NAME, category.name)
+        }
+
+        db.insert(CategoriesContract.CategoryEntry.TABLE_NAME, null, values)
+    }
+
+    fun updateCategory(category: Category) {
+        val values = ContentValues().apply {
+            put(CategoriesContract.CategoryEntry.CATEGORY_NAME, category.name)
+        }
+        db.update(CategoriesContract.CategoryEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(category.id.toString()))
+    }
+
+    fun getSortedListOfProducts(selectedSort: Int, filterBy: String, filter: String): List<Product> {
+        val products = mutableListOf<Product>()
+
+        val projection = arrayOf(
+            BaseColumns._ID,
+            ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID,
+            ProductContract.ProductEntry.AMOUNT,
+            ProductContract.ProductEntry.DATE_OF_PRODUCTION,
+            ProductContract.ProductEntry.EXPIRY_DATE,
+        )
+
+        var orderBy: String = ""
+
+        when (selectedSort) {
+            0 -> {
+                orderBy =
+                    "(SELECT ${AbstractProductContract.AbstractProductEntry.PRODUCT_NAME} FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${BaseColumns._ID} = ${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID}) ASC"
+            }
+
+            1 -> {
+                orderBy =
+                    "(SELECT ${AbstractProductContract.AbstractProductEntry.CATEGORY} FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${BaseColumns._ID} = ${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID}) ASC"
+            }
+
+            3 -> {
+                orderBy = "${ProductContract.ProductEntry.DATE_OF_PRODUCTION} ASC"
+            }
+
+            4 -> {
+                orderBy = "${ProductContract.ProductEntry.EXPIRY_DATE} ASC"
+            }
+        }
+
+        var selection: String? = null
+        var selectionArgs: Array<String>? = null
+
+        when (filterBy) {
+            "expiryDate" -> {
+                selection = "${ProductContract.ProductEntry.EXPIRY_DATE} = ?"
+                selectionArgs = arrayOf(filter)
+            }
+
+            "" -> {}
+        }
+
+        val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, orderBy)
+
+        with(cursor) {
+            while (moveToNext()) {
+                val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
+                val abstractProductId =
+                    getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID))
+                val amount = getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.AMOUNT))
+                val dateOfProduction =
+                    getLong(getColumnIndexOrThrow(ProductContract.ProductEntry.DATE_OF_PRODUCTION))
+                val dateOfExpiry = getLong(getColumnIndexOrThrow(ProductContract.ProductEntry.EXPIRY_DATE))
+
+                val product = Product(productId, abstractProductId, amount, dateOfProduction, dateOfExpiry)
+
+                if (selectedSort == 2) { //freshness
+                    products.add(product)
+                }
+            }
+        }
+
+        products.sortWith(compareByDescending { it.freshness })
+
+        return products
+    }
+
+    fun getSortedListOfAbstractProducts(selectedSort: Int, filterBy: String, filter: Array<String>): List<AbstractProduct> {
+
+        val abstractProducts = mutableListOf<AbstractProduct>()
+
+        val projection = arrayOf(
+            BaseColumns._ID,
+            AbstractProductContract.AbstractProductEntry.BARCODE,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NAME,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT,
+            AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME,
+            AbstractProductContract.AbstractProductEntry.CATEGORY,
+            AbstractProductContract.AbstractProductEntry.UNIT
+        )
+
+        var orderBy: String = ""
+        when(selectedSort) {
+            0 -> {
+                orderBy = "${AbstractProductContract.AbstractProductEntry.PRODUCT_NAME} ASC"
+            }
+            1 -> {
+                orderBy = "${AbstractProductContract.AbstractProductEntry.CATEGORY} ASC"
+            }
+        }
+
+        var selection = ""
+        var selectionArgs: Array<String>? = null
+
+        when (filterBy) {
+            "category" -> {
+                selection = "${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?"
+                selectionArgs = filter
+            }
+            "barcodeless" -> {
+                selection = "${AbstractProductContract.AbstractProductEntry.BARCODE} = '' "
+                selectionArgs = null
+            }
+        }
+
+
+        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, orderBy)
+
+        with (cursor) {
+            while(moveToNext()) {
+                val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
+                val barcode = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.BARCODE))
+                val productName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
+                val netWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
+                val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
+                val category = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.CATEGORY))
+                val unit = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
+
+                val product = AbstractProduct(productId, barcode, productName, netWeight, productImageHash, category, unit)
+
+                abstractProducts.add(product)
+            }
+        }
+        return  abstractProducts
     }
 
     companion object {
         const val DATABASE_VERSION = 1
-        const val DATABASE_NAME = "database.db"
+        var DATABASE_NAME = "database.db"
     }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/AddAbstractProductActivity.kt

@@ -1,11 +1,10 @@
 package org.foxarmy.barcodescannerforemployees.activities
 
-import android.content.ContentValues
 import android.content.DialogInterface
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Build
 import android.os.Bundle
-import android.provider.BaseColumns
 import android.util.Log
 import android.widget.*
 import androidx.activity.result.contract.ActivityResultContracts
@@ -49,11 +48,23 @@ class AddAbstractProductActivity : AppCompatActivity() {
 
     private var scanningBarcode = false
 
+    private lateinit var db: DBStorageController
+    private lateinit var sharedPreferences: SharedPreferences
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.fragment_add_abstract_product)
 
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(this, sharedPreferences.getString("currentGroup", "database")!!)
 
         picturesPath = File(filesDir, "pictures")
         val thumbnailsDir = File(cacheDir, "thumbnails")
@@ -92,6 +103,7 @@ class AddAbstractProductActivity : AppCompatActivity() {
             "update" -> {
                 abstractProduct = extras.get("abstractProduct") as AbstractProduct?
             }
+
             "new_from_barcode" -> {
                 abstractProduct = extras.get("abstractProduct") as AbstractProduct?
                 barcode = abstractProduct!!.barcode
@@ -131,43 +143,10 @@ class AddAbstractProductActivity : AppCompatActivity() {
                 Toast.makeText(this, getString(R.string.product_net_weight_request), Toast.LENGTH_SHORT).show()
             }
 
-            val db = DBStorageController(this).writableDatabase
-            val values = ContentValues().apply {
-                put(AbstractProductContract.AbstractProductEntry.BARCODE, barcode)
-                put(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME, productName)
-                put(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT, netWeight.toString())
-                put(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME, pictureFile.nameWithoutExtension)
-                put(AbstractProductContract.AbstractProductEntry.CATEGORY, categorySpinner.selectedItemPosition)
-                put(AbstractProductContract.AbstractProductEntry.UNIT, unitTypeSpinner.selectedItemPosition)
-            }
-
             if (action == "update") {
-                db.update(
+                db.updateAbstractProduct(abstractProduct!!, this)
-                    AbstractProductContract.AbstractProductEntry.TABLE_NAME,
-                    values,
-                    "${BaseColumns._ID} = ?",
-                    arrayOf(abstractProduct!!.id.toString())
-                )
             } else if (action == "new" || action == "new_from_barcode") {
-                val id = db.insert(AbstractProductContract.AbstractProductEntry.TABLE_NAME, null, values)
+                db.addAbstractProduct(abstractProduct!!, this)
-                val n = Net()
-                val abstractProduct = AbstractProduct(id.toInt(), barcode, productName, netWeight.toString().toDouble(), pictureFile.nameWithoutExtension, categorySpinner.selectedItemPosition, unitTypeSpinner.selectedItemPosition)
-                val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
-
-                val sharedPreferences = EncryptedSharedPreferences.create(
-                    "sensitive",
-                    masterKeyAlias,
-                    applicationContext,
-                    EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
-                    EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
-                )
-
-                n.language = sharedPreferences.getString("language", "en-US")!!
-                n.server = sharedPreferences.getString("server", "")!!
-                n.token = sharedPreferences.getString("token", "")!!
-                val response = n.uploadAbstractProduct(1, abstractProduct, File(pictureFile.absolutePath));
-
-                Toast.makeText(this, response.body!!.string(), Toast.LENGTH_LONG).show()
             }
             finish()
         }
@@ -190,11 +169,7 @@ class AddAbstractProductActivity : AppCompatActivity() {
 
         var abstractProduct: AbstractProduct
 
-        if (DBStorageController(this).findAbstractProductByBarcode(
+        if (db.findAbstractProductByBarcode(this.barcode) != null) {
-                DBStorageController(this).readableDatabase,
-                this.barcode
-            ) != null
-        ) {
             AlertDialog.Builder(this)
                 .setMessage(getString(R.string.abstract_product_already_exists))
                 .setPositiveButton(getString(R.string.quit)) { _: DialogInterface, _: Int ->
@@ -203,10 +178,8 @@ class AddAbstractProductActivity : AppCompatActivity() {
                 .setNegativeButton(getString(R.string.edit_existing)) { _: DialogInterface, _: Int ->
                     val addProductIntent = Intent(this, AddAbstractProductActivity::class.java)
                     val extras = Bundle()
-                    val existingAbstractProduct = DBStorageController(this).findAbstractProductByBarcode(
+                    val existingAbstractProduct = db.findAbstractProductByBarcode(this.barcode)
-                        DBStorageController(this).readableDatabase,
+
-                        this.barcode
-                    )
                     extras.putParcelable("abstractProduct", existingAbstractProduct)
                     addProductIntent.putExtras(extras)
                     ContextCompat.startActivity(this, addProductIntent, extras)
@@ -243,40 +216,17 @@ class AddAbstractProductActivity : AppCompatActivity() {
             getString(R.string.pieces)
         )
 
-
         val arrayAdapter =
-            ArrayAdapter<String>(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, units)
+            ArrayAdapter(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, units)
         arrayAdapter.setDropDownViewResource(androidx.appcompat.R.layout.support_simple_spinner_dropdown_item)
         unitTypeSpinner.adapter = arrayAdapter
     }
 
     fun fillupCategorySpinner() {
-        val db = DBStorageController(this).readableDatabase
+        val categories = db.getAllCategories().map { category -> category.name }
-
-        val categories = mutableListOf("")
-
-        val projection = arrayOf(
-            CategoriesContract.CategoryEntry.CATEGORY_NAME
-        )
-
-        val cursor = db.query(
-            CategoriesContract.CategoryEntry.TABLE_NAME,
-            projection,
-            null,
-            null,
-            null,
-            null,
-            BaseColumns._ID + " ASC"
-        )
-
-        with(cursor) {
-            while (moveToNext()) {
-                categories.add(getString(getColumnIndexOrThrow(CategoriesContract.CategoryEntry.CATEGORY_NAME)))
-            }
-        }
 
         val arrayAdapter =
-            ArrayAdapter<String>(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, categories)
+            ArrayAdapter(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, categories)
         arrayAdapter.setDropDownViewResource(androidx.appcompat.R.layout.support_simple_spinner_dropdown_item)
         categorySpinner.adapter = arrayAdapter
     }
@@ -322,7 +272,8 @@ class AddAbstractProductActivity : AppCompatActivity() {
                     getPicture()
                 }
             } else {
-                Toast.makeText(this, getString(R.string.camera_permission_for_picture_request), Toast.LENGTH_LONG).show()
+                Toast.makeText(this, getString(R.string.camera_permission_for_picture_request), Toast.LENGTH_LONG)
+                    .show()
             }
         }
 
@@ -339,6 +290,12 @@ class AddAbstractProductActivity : AppCompatActivity() {
         }
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
+
     private fun prepareBarcodeScanner() {
         val options = ScanOptions()
         options.setDesiredBarcodeFormats(ScanOptions.EAN_13)

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/AddCategoryActivity.kt

@@ -1,23 +1,37 @@
 package org.foxarmy.barcodescannerforemployees.activities
 
 import android.app.Activity
-import android.content.ContentValues
+import android.content.SharedPreferences
 import android.os.Bundle
-import android.provider.BaseColumns
 import android.widget.Button
 import android.widget.EditText
 import android.widget.Toast
-import org.foxarmy.barcodescannerforemployees.CategoriesContract
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 
 class AddCategoryActivity : Activity() {
+
+    private lateinit var db: DBStorageController
+    private lateinit var sharedPreferences: SharedPreferences
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.activity_add_category)
 
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(this, sharedPreferences.getString("currentGroup", "database")!!)
+
         val extras = intent.extras
         val category = extras!!.get("category") as Category?
 
@@ -26,27 +40,24 @@ class AddCategoryActivity : Activity() {
         categoryNameTextEdit.setText(category!!.name)
 
         findViewById<Button>(R.id.saveButton).setOnClickListener {
-            val db = DBStorageController(this).writableDatabase
-
             if (categoryNameTextEdit.text.toString() == "") {
                 Toast.makeText(this, getString(R.string.category_name_required), Toast.LENGTH_SHORT).show()
                 return@setOnClickListener
             }
 
             if (category.id == 0) { // Inserting new category
-                val values = ContentValues().apply {
+                db.addCategory(Category(0, categoryNameTextEdit.text.toString()))
-                    put(CategoriesContract.CategoryEntry.CATEGORY_NAME, categoryNameTextEdit.text.toString())
-                }
-
-                db.insert(CategoriesContract.CategoryEntry.TABLE_NAME, null, values)
             } else { // Updating existing category
-                val values = ContentValues().apply {
+                db.updateCategory(category)
-                    put(CategoriesContract.CategoryEntry.CATEGORY_NAME, categoryNameTextEdit.text.toString())
-                }
-                db.update(CategoriesContract.CategoryEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(category.id.toString()))
             }
 
             finish()
         }
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/AddProductActivity.kt

@@ -2,6 +2,7 @@ package org.foxarmy.barcodescannerforemployees.activities
 
 import android.app.Activity
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Build
 import android.os.Bundle
 import android.view.View
@@ -12,6 +13,8 @@ import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.core.widget.addTextChangedListener
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import com.journeyapps.barcodescanner.ScanContract
 import com.journeyapps.barcodescanner.ScanIntentResult
 import com.journeyapps.barcodescanner.ScanOptions
@@ -45,11 +48,24 @@ class AddProductActivity : AppCompatActivity() {
     private var product: Product? = null
     private var abstractProduct: AbstractProduct? = null
 
+    private lateinit var db: DBStorageController
+    private lateinit var sharedPreferences: SharedPreferences
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.fragment_add_product)
 
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(this, sharedPreferences.getString("currentGroup", "database")!!)
+
         scanButton = findViewById(R.id.scanButton)
         noBarcodeButton = findViewById(R.id.noBarcodeButton)
         abstractProductView = findViewById(R.id.abstractProductView)
@@ -70,7 +86,7 @@ class AddProductActivity : AppCompatActivity() {
         product = extras!!.get("product") as Product?
 
         if (product != null) {
-            abstractProduct = DBStorageController(this).findAbstractProductById(DBStorageController(this).readableDatabase, product!!.abstractProductId)
+            abstractProduct = db.findAbstractProductById(product!!.abstractProductId)
             abstractProductView.abstractProduct = abstractProduct!!
             expiryDateRadioButton.isSelected = true
             shelfLifeRadioButton.isSelected = false
@@ -148,9 +164,9 @@ class AddProductActivity : AppCompatActivity() {
             }
 
             if (updatingExistentProduct) {
-                DBStorageController(this).updateProduct(DBStorageController(this).writableDatabase, product!!)
+                db.updateProduct(product!!)
             } else {
-                DBStorageController(this).insertNewProduct(DBStorageController(this).writableDatabase, product!!)
+                db.insertNewProduct(product!!)
             }
 
             finish()
@@ -245,7 +261,7 @@ class AddProductActivity : AppCompatActivity() {
                 Toast.makeText(this, getString(R.string.cancelled), Toast.LENGTH_SHORT).show()
             } else {
                 val scannedBarcode = result.contents
-                abstractProduct = DBStorageController(this).findAbstractProductByBarcode(DBStorageController(this).readableDatabase, scannedBarcode)
+                abstractProduct = db.findAbstractProductByBarcode(scannedBarcode)
 
                 displayAbstractProduct(abstractProduct, scannedBarcode)
                 if (abstractProduct != null) {
@@ -266,4 +282,10 @@ class AddProductActivity : AppCompatActivity() {
 
         scanLauncher.launch(options)
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/ExpiryCalendarActivity.kt

@@ -2,10 +2,13 @@ package org.foxarmy.barcodescannerforemployees.activities
 
 import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
 import android.widget.LinearLayout
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.databinding.ActivityExpiryCalendarBinding
@@ -14,11 +17,24 @@ import org.foxarmy.barcodescannerforemployees.views.ExpiryGroupView
 class ExpiryCalendarActivity : AppCompatActivity() {
     private lateinit var binding: ActivityExpiryCalendarBinding
 
+    private lateinit var db: DBStorageController
+    private lateinit var sharedPreferences: SharedPreferences
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         setContentView(R.layout.fragment_expiry_dates)
 
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(this, sharedPreferences.getString("currentGroup", "database")!!)
+
         fillUp()
     }
 
@@ -31,7 +47,7 @@ class ExpiryCalendarActivity : AppCompatActivity() {
     }
 
     private fun fillUp() {
-        val dates = DBStorageController(this).findAllExpiryDates(DBStorageController(this).readableDatabase)
+        val dates = db.findAllExpiryDates()
 
         val container = findViewById<LinearLayout>(R.id.datesLinearLayout)
 

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/GroupActivity.kt

@@ -19,11 +19,9 @@ class GroupActivity : AppCompatActivity() {
         binding = ActivityGroupBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
-
         val sharedPreferences = EncryptedSharedPreferences.create(
             "sensitive",
-            masterKeyAlias,
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
             applicationContext,
             EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
             EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/LoginActivity.kt

@@ -25,11 +25,9 @@ class LoginActivity : AppCompatActivity() {
 
         fillUpLanguagesSpinner()
 
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
-
         val sharedPreferences = EncryptedSharedPreferences.create(
             "sensitive",
-            masterKeyAlias,
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
             applicationContext,
             EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
             EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/ManageGroupActivity.kt

@@ -56,11 +56,9 @@ class ManageGroupActivity : AppCompatActivity(){
     }
 
     fun amIAnAdminIn(groupId: Int): Boolean {
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
-
         val sharedPreferences = EncryptedSharedPreferences.create(
             "sensitive",
-            masterKeyAlias,
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
             applicationContext,
             EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
             EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MyGroupsActivity.kt

@@ -22,11 +22,9 @@ class MyGroupsActivity : AppCompatActivity(){
         binding = ActivityMyGroupsBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
-
         val sharedPreferences = EncryptedSharedPreferences.create(
             "sensitive",
-            masterKeyAlias,
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
             applicationContext,
             EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
             EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/NavigatorActivity.kt

@@ -2,15 +2,26 @@ package org.foxarmy.barcodescannerforemployees.activities
 
 import android.app.Activity
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
-import android.util.Log
 import androidx.security.crypto.EncryptedSharedPreferences
 import androidx.security.crypto.MasterKeys
 
 class NavigatorActivity : Activity() {
+
+    private lateinit var sharedPreferences: SharedPreferences
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
         var intent = Intent(this, MainActivity::class.java)
 
         if (!isInGroup()) {
@@ -27,33 +38,10 @@ class NavigatorActivity : Activity() {
     }
 
     private fun isAuthenticated(): Boolean {
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+        return sharedPreferences.getString("token", "") != ""
-
-        val sharedPreferences = EncryptedSharedPreferences.create(
-            "sensitive",
-            masterKeyAlias,
-            applicationContext,
-            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
-            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
-        )
-
-        val jwt = sharedPreferences.getString("token", "")
-        return jwt != ""
     }
 
     private fun isInGroup(): Boolean {
-        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+        return sharedPreferences.getStringSet("groups", emptySet())!!.isNotEmpty()
-
-        val sharedPreferences = EncryptedSharedPreferences.create(
-            "sensitive",
-            masterKeyAlias,
-            applicationContext,
-            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
-            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
-        )
-
-        val groups = sharedPreferences.getStringSet("groups", emptySet())
-        Log.d("QWERTYUIOP", groups.toString())
-        return groups!!.isNotEmpty()
     }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/CategoriesFragment.kt

@@ -1,8 +1,8 @@
 package org.foxarmy.barcodescannerforemployees.fragments
 
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
-import android.provider.BaseColumns
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -11,14 +11,32 @@ import android.widget.Toast
 import androidx.core.content.ContextCompat
 import androidx.core.view.children
 import androidx.fragment.app.Fragment
-import org.foxarmy.barcodescannerforemployees.CategoriesContract
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.AddCategoryActivity
-import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.views.CategoryView
 
 class CategoriesFragment : Fragment() {
+
+    private lateinit var sharedPreferences: SharedPreferences
+    private lateinit var db: DBStorageController
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            requireContext(),
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(requireContext(), sharedPreferences.getString("currentGroup", "database")!!)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -35,11 +53,10 @@ class CategoriesFragment : Fragment() {
     fun removeSelected() {
         val layout = view?.findViewById<LinearLayout>(R.id.categoriesLayout)
 
-        val db = DBStorageController(requireContext())
         var deleted = false
         for (view: CategoryView in layout?.children!!.iterator() as Iterator<CategoryView>) {
             if (view.isCategorySelected) {
-                db.eraseCategory(db.writableDatabase, view.category.id, requireContext())
+                db.eraseCategory(view.category.id, requireContext())
                 deleted = true
             }
         }
@@ -67,31 +84,23 @@ class CategoriesFragment : Fragment() {
         val layout = view?.findViewById<LinearLayout>(R.id.categoriesLayout)
         layout?.removeAllViews()
 
-        val db = DBStorageController(requireContext()).readableDatabase
+        val categories = db.getAllCategories()
-
-        val projection = arrayOf(
-            BaseColumns._ID,
-            CategoriesContract.CategoryEntry.CATEGORY_NAME
-        )
-
-        val cursor = db.query(CategoriesContract.CategoryEntry.TABLE_NAME, projection, null, null, null, null, null)
-
-        with (cursor) {
-            while(moveToNext()) {
-                val categoryId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val categoryName = getString(getColumnIndexOrThrow(CategoriesContract.CategoryEntry.CATEGORY_NAME))
-
-                val category = Category(categoryId, categoryName)
 
+        for (category in categories) {
             val categoryView = CategoryView(requireActivity(), requireContext(), category)
             layout?.addView(categoryView)
         }
     }
-    }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
         updateContent()
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/ShelfFragment.kt

@@ -1,9 +1,8 @@
 package org.foxarmy.barcodescannerforemployees.fragments
 
-import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
-import android.provider.BaseColumns
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -15,13 +14,12 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.children
 import androidx.fragment.app.Fragment
 import androidx.gridlayout.widget.GridLayout
-import org.foxarmy.barcodescannerforemployees.AbstractProductContract
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.DBStorageController
-import org.foxarmy.barcodescannerforemployees.ProductContract
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.AddProductActivity
 import org.foxarmy.barcodescannerforemployees.databinding.FragmentShelfBinding
-import org.foxarmy.barcodescannerforemployees.dataclasses.Product
 import org.foxarmy.barcodescannerforemployees.views.ProductView
 import kotlin.concurrent.thread
 
@@ -32,6 +30,23 @@ class ShelfFragment : Fragment() {
     private var filterBy = ""
     private var filter = ""
 
+    private lateinit var db: DBStorageController
+    private lateinit var sharedPreferences: SharedPreferences
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            requireContext(),
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(requireContext(), sharedPreferences.getString("currentGroup", "database")!!)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -107,88 +122,7 @@ class ShelfFragment : Fragment() {
                 grv?.removeAllViews()
             }
 
-            val db = DBStorageController(requireContext()).readableDatabase
+            val products = db.getSortedListOfProducts(binding.spinner.selectedItemPosition, filterBy, filter)
-            val projection = arrayOf(
-                BaseColumns._ID,
-                ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID,
-                ProductContract.ProductEntry.AMOUNT,
-                ProductContract.ProductEntry.DATE_OF_PRODUCTION,
-                ProductContract.ProductEntry.EXPIRY_DATE,
-            )
-
-            var orderBy: String = ""
-
-            when (binding.spinner.selectedItemPosition) {
-                0 -> {
-                    orderBy =
-                        "(SELECT ${AbstractProductContract.AbstractProductEntry.PRODUCT_NAME} FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${BaseColumns._ID} = ${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID}) ASC"
-                }
-
-                1 -> {
-                    orderBy =
-                        "(SELECT ${AbstractProductContract.AbstractProductEntry.CATEGORY} FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${BaseColumns._ID} = ${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID}) ASC"
-                }
-// Wow, I wrote this on first try but unfortunately SQLite can't do that :(
-// I'll leave it here as a memory.
-//                "Freshness" -> {
-//                    orderBy =
-//                        "(SELECT ( (julianday(${ProductContract.ProductEntry.EXPIRY_DATE}) - julianday('now', 'localtime')) / (julianday(${ProductContract.ProductEntry.EXPIRY_DATE}) - julianday(${ProductContract.ProductEntry.DATE_OF_PRODUCTION})) )) ASC"
-//                }
-
-                3 -> {
-                    orderBy = "${ProductContract.ProductEntry.DATE_OF_PRODUCTION} ASC"
-                }
-
-                4 -> {
-                    orderBy = "${ProductContract.ProductEntry.EXPIRY_DATE} ASC"
-                }
-            }
-
-            var selection: String? = null
-            var selectionArgs: Array<String>? = null
-
-            when (filterBy) {
-                "expiryDate" -> {
-                    selection = "${ProductContract.ProductEntry.EXPIRY_DATE} = ?"
-                    selectionArgs = arrayOf(filter)
-                }
-
-                "" -> {}
-            }
-
-
-            val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, orderBy)
-
-            val products = mutableListOf<Product>()
-
-            with(cursor) {
-                while (moveToNext()) {
-                    val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                    val abstractProductId =
-                        getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID))
-                    val amount = getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.AMOUNT))
-                    val dateOfProduction =
-                        getLong(getColumnIndexOrThrow(ProductContract.ProductEntry.DATE_OF_PRODUCTION))
-                    val dateOfExpiry = getLong(getColumnIndexOrThrow(ProductContract.ProductEntry.EXPIRY_DATE))
-
-                    val product = Product(productId, abstractProductId, amount, dateOfProduction, dateOfExpiry)
-
-                    if (binding.spinner.selectedItemPosition == 2) { //freshness
-                        products.add(product)
-                    } else {
-                        val productView = ProductView(
-                            requireActivity(),
-                            requireContext(),
-                            product
-                        )
-                        activity!!.runOnUiThread {
-                            grv?.addView(productView)
-                        }
-                    }
-                }
-            }
-
-            products.sortWith(compareByDescending { it.freshness })
 
             for (product in products.iterator()) {
                 val productView = ProductView(
@@ -201,6 +135,7 @@ class ShelfFragment : Fragment() {
                 }
             }
             updateInProgress = false
+
         }
     }
 
@@ -208,14 +143,13 @@ class ShelfFragment : Fragment() {
         thread {
             val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
 
-            val db = DBStorageController(requireContext())
             var deleted = false
             for (view: ProductView in grv?.children!!.iterator() as Iterator<ProductView>) {
                 activity!!.runOnUiThread {
                     view.findViewById<ImageView>(R.id.productPicture).setImageURI(null)
                 }
                 if (view.isProductSelected) {
-                    db.eraseProduct(db.writableDatabase, view.product.id)
+                    db.eraseProduct(view.product.id)
                     deleted = true
                 }
             }
@@ -229,6 +163,12 @@ class ShelfFragment : Fragment() {
         }
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
+
     companion object {
 
         fun newInstance(date: Long):ShelfFragment = ShelfFragment().apply {

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/StorageFragment.kt

@@ -1,8 +1,8 @@
 package org.foxarmy.barcodescannerforemployees.fragments
 
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
-import android.provider.BaseColumns
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -10,13 +10,13 @@ import android.widget.*
 import androidx.core.content.ContextCompat
 import androidx.core.view.children
 import androidx.fragment.app.Fragment
-import org.foxarmy.barcodescannerforemployees.AbstractProductContract
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.AddAbstractProductActivity
 import org.foxarmy.barcodescannerforemployees.activities.FindBarcodelessAbstractProduct
 import org.foxarmy.barcodescannerforemployees.databinding.FragmentStorageBinding
-import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
 import org.foxarmy.barcodescannerforemployees.generateThumbnailForImage
 import org.foxarmy.barcodescannerforemployees.views.AbstractProductView
 import kotlin.concurrent.thread
@@ -26,6 +26,24 @@ class StorageFragment : Fragment() {
     private lateinit var binding: FragmentStorageBinding
     private var filterBy = ""
     private lateinit var filter: Array<String>
+
+    private lateinit var sharedPreferences: SharedPreferences
+    private lateinit var db: DBStorageController
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+            requireContext(),
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        db = DBStorageController(requireContext(), sharedPreferences.getString("currentGroup", "database")!!)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -72,14 +90,13 @@ class StorageFragment : Fragment() {
         thread {
             val grv = binding.contentGridLayout
 
-            val db = DBStorageController(requireContext())
             var deleted = false
             for (view: AbstractProductView in grv.children.iterator() as Iterator<AbstractProductView>) {
                 activity!!.runOnUiThread {
                     view.findViewById<ImageView>(R.id.productPicture).setImageURI(null)
                 }
                 if (view.isProductSelected) {
-                    db.eraseAbstractProduct(db.writableDatabase, view.abstractProduct.id, requireContext())
+                    db.eraseAbstractProduct(view.abstractProduct.id, requireContext())
                     deleted = true
                 }
             }
@@ -115,77 +132,29 @@ class StorageFragment : Fragment() {
                 grv.removeAllViews()
             }
 
-            val db = DBStorageController(requireContext()).readableDatabase
+            val abstractProducts = db.getSortedListOfAbstractProducts(binding.spinner.selectedItemPosition, filterBy, filter)
-            val projection = arrayOf(
-                BaseColumns._ID,
-                AbstractProductContract.AbstractProductEntry.BARCODE,
-                AbstractProductContract.AbstractProductEntry.PRODUCT_NAME,
-                AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT,
-                AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME,
-                AbstractProductContract.AbstractProductEntry.CATEGORY,
-                AbstractProductContract.AbstractProductEntry.UNIT
-            )
 
-            var orderBy: String = ""
+            for (abstractProduct in abstractProducts) {
-            when(binding.spinner.selectedItemPosition) {
+                generateThumbnailForImage(context!!, abstractProduct.imageHash)
-                0 -> {
-                    orderBy = "${AbstractProductContract.AbstractProductEntry.PRODUCT_NAME} ASC"
-                }
-                1 -> {
-                    orderBy = "${AbstractProductContract.AbstractProductEntry.CATEGORY} ASC"
-                }
-            }
 
-            var selection = ""
+                val abstractProductView = AbstractProductView(
-            var selectionArgs: Array<String>? = null
-
-            when (filterBy) {
-                "category" -> {
-                    selection = "${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?"
-                    selectionArgs = filter
-                }
-                "barcodeless" -> {
-                    selection = "${AbstractProductContract.AbstractProductEntry.BARCODE} = '' "
-                    selectionArgs = null
-                }
-            }
-
-
-            val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, orderBy)
-
-            with (cursor) {
-                while(moveToNext()) {
-                    val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                    val barcode = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.BARCODE))
-                    val productName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                    val netWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
-                    val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
-                    val category = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.CATEGORY))
-                    val unit = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.UNIT))
-
-                    val product = AbstractProduct(productId, barcode, productName, netWeight, productImageHash, category, unit)
-
-                    generateThumbnailForImage(context!!, productImageHash)
-
-                    val abstractProduct = AbstractProductView(
                     requireActivity(),
                     requireContext(),
-                        product
+                    abstractProduct
                 )
 
                 if (filterBy == "barcodeless") {
-                        abstractProduct.setOnClickListener {
+                    abstractProductView.setOnClickListener {
-                            (activity as FindBarcodelessAbstractProduct).selected(abstractProduct.abstractProduct)
+                        (activity as FindBarcodelessAbstractProduct).selected(abstractProductView.abstractProduct)
                     }
-                        abstractProduct.findViewById<TextView>(R.id.productNameView).setOnClickListener {
+                    abstractProductView.findViewById<TextView>(R.id.productNameView).setOnClickListener {
-                            (activity as FindBarcodelessAbstractProduct).selected(abstractProduct.abstractProduct)
+                        (activity as FindBarcodelessAbstractProduct).selected(abstractProductView.abstractProduct)
 
                     }
                 }
 
                 activity!!.runOnUiThread{
-                        grv.addView(abstractProduct)
+                    grv.addView(abstractProductView)
-                    }
                 }
             }
         }.join()
@@ -202,6 +171,13 @@ class StorageFragment : Fragment() {
         filter = arrayOf("$id")
         updateContent()
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        db.close()
+    }
+
     companion object {
 
         fun newInstance(filterBy: String, filter: Array<String>):StorageFragment = StorageFragment().apply {