From b267459114e989fe9ec4d930704b614b5ce1212d Mon Sep 17 00:00:00 2001
From: Elias Projahn <johrpan@gmail.com>
Date: Sun, 19 Jan 2020 12:57:16 +0100
Subject: [PATCH] Add coins to storage

This adds an integer value representing the amount of coins that the
player has. Therefore rxdart is introduced as a dependency.
---
 lib/storage.dart | 19 ++++++++++++++++++-
 pubspec.yaml     |  1 +
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/storage.dart b/lib/storage.dart
index 5b5947c..7b31147 100644
--- a/lib/storage.dart
+++ b/lib/storage.dart
@@ -1,8 +1,11 @@
+import 'package:rxdart/rxdart.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 final storage = Storage();
 
 class Storage {
+  final coins = BehaviorSubject.seeded(0);
+
   SharedPreferences shPref;
 
   int get highScore1 {
@@ -30,7 +33,21 @@ class Storage {
   }
 
   Future<void> init() async {
-    shPref = await SharedPreferences.getInstance();
+    if (shPref == null) {
+      shPref = await SharedPreferences.getInstance();
+
+      try {
+        coins.add(shPref.getInt('coins') ?? 0);
+      } on TypeError {
+        // Nothing to do
+      }
+    }
+  }
+
+  Future<void> addCoins(int amount) async {
+    final newCoins = coins.value + amount;
+    coins.add(newCoins);
+    await shPref.setInt('coins', newCoins);
   }
 
   Future<void> addScore(int score) async {
diff --git a/pubspec.yaml b/pubspec.yaml
index 81de93a..61764e1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,6 +12,7 @@ dependencies:
     sdk: flutter
   flutter_localizations:
     sdk: flutter
+  rxdart:
   shared_preferences:
   sprintf:
   vector_math: