added first working prototype of flashcards

frontend/lib/main.dart

@@ -62,7 +62,8 @@ class HlaskovnikFrontendApp extends StatelessWidget {
         ),
         useMaterial3: true,
       ),
-      themeMode: ThemeMode.system,
+      //themeMode: ThemeMode.system, // TODO: .dark is just for testing
+      themeMode: ThemeMode.dark,
       routerConfig: _router,
     );
   }

frontend/lib/pages/flashcards.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 
 import 'package:frontend/provider/quote_provider.dart';
-import 'package:frontend/model/quote.dart';
 
 import 'package:provider/provider.dart';
 
@@ -15,6 +14,8 @@ class FlashcardsPage extends StatelessWidget {
   Widget build(BuildContext context) {
     //return const Center(child: Text('flashcards! flip flip'));
     final provider = Provider.of<QuoteProvider>(context);
+    if (provider.randomQuoteText == "dummy" ||
+    provider.randomQuoteText == "quote text") { provider.nextRandomQuote(); } // initialize the random quote variable 
     return Card(
       margin: const EdgeInsets.all(Constants.edgeInset),
       child: Padding(
@@ -22,22 +23,46 @@ class FlashcardsPage extends StatelessWidget {
         child: Column(
           mainAxisSize: MainAxisSize.min,
           crossAxisAlignment: CrossAxisAlignment.center,
+          mainAxisAlignment: MainAxisAlignment.center,
           children: [
-            Text('insert random quote body here'),
+            Padding(
+              padding: const EdgeInsets.all(Constants.edgeInset*2),
+              child: Text(provider.randomQuoteText,
+                style: TextStyle(
+                  fontSize: 35,
+                ),
+              ),
+            ),
             Row(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
-                TextButton(
-                  child: Text('flip around'),
-                  onPressed: () {
-                    // TODO: flip the card
-                  },
+                Padding(
+                  padding: const EdgeInsets.all(Constants.edgeInset),
+                  child: TextButton.icon(
+                    onPressed: provider.flipRandomQuote,
+                    icon: Icon(Icons.repeat,
+                      size: 35,
+                    ),
+                    label: Text(Strings.flipFlashcard,
+                      style: TextStyle(
+                        fontSize: 35,
+                      ),
+                    ),
+                  ),
                 ),
-                TextButton(
-                  child: Text('next card'),
-                  onPressed: () {
-                    // TODO: next random card
-                  },
+                Padding(
+                  padding: const EdgeInsets.all(Constants.edgeInset),
+                  child: TextButton.icon(
+                    onPressed: provider.nextRandomQuote,
+                    icon: Icon(Icons.arrow_right_alt,
+                      size: 35,
+                    ),
+                    label: Text(Strings.nextFlashcard,
+                      style: TextStyle(
+                        fontSize: 35,
+                      ),
+                    ),
+                  ),
                 ),
               ],
             ),

frontend/lib/provider/quote_provider.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 
 import 'package:frontend/model/quote.dart';
 import 'package:frontend/repository/quote_repository.dart';
+import 'dart:math';
 
 class QuoteProvider extends ChangeNotifier {
   List<Quote> _quotes = [];
@@ -44,6 +45,31 @@ class QuoteProvider extends ChangeNotifier {
     filterController.text = '';
   }
 
+  Quote randomQuote = Quote(
+    id: 0,
+    body: "quote text",
+    author: "dummy"
+  );
+  bool randomQuoteDeterminator = true;
+  String get randomQuoteText { 
+    if (randomQuoteDeterminator) {
+      return randomQuote.body;
+    } else {
+      return randomQuote.author;
+    }
+  }
+
+  void flipRandomQuote() {
+    randomQuoteDeterminator = !randomQuoteDeterminator;
+    notifyListeners();
+  }
+
+  void nextRandomQuote() {
+    final random = Random();
+    randomQuote = filteredQuotes[random.nextInt(filteredQuotes.length)];
+    notifyListeners();
+  }
+
   void filterQuotes() {
     notifyListeners();
   }

frontend/lib/values/strings.dart

@@ -19,6 +19,9 @@ class Strings {
   static const String quote = "Hláška";
   static const String author = "Autor";
 
+  static const String flipFlashcard = "Otočit flashkartu";
+  static const String nextFlashcard = "Další flashkarta";
+
   static const String noUndo = "Tuto akci nelze odčinit.";
   static const String filterQuery = "Filtrovací požadavek";
   static const String allQuotesCount = "Celkový počet hlášek";