save token and settings also in sqlite db

lib/db/database.dart

@@ -8,7 +8,7 @@ import '../log/log.dart';
 class Db {
   late Database _db;
 
-  void init() async {
+  Future<void> init() async {
     if (kIsWeb) {
       Log.i("Database on web is not supported");
       return;
@@ -27,13 +27,20 @@ class Db {
     _db = await openDatabase(
       dbpath,
       onCreate: (db, version) {
-        return db.execute(
-          'CREATE TABLE previews(id INTEGER PRIMARY KEY, thumbnail BLOB)',
+        final batch = db.batch();
+        batch.execute(
+          'CREATE TABLE previews(id INTEGER PRIMARY KEY, thumbnail BLOB);',
         );
+        batch.execute(
+          'CREATE TABLE settings(domain TEXT, token TEXT, videopath TEXT, tilewidth INTEGER);',
+        );
+        batch.insert("settings",
+            {"domain": "", "token": "", "videopath": "", "tilewidth": 0});
+        return batch.commit();
       },
       // Set the version. This executes the onCreate function and provides a
       // path to perform database upgrades and downgrades.
-      version: 1,
+      version: 2,
     );
   }
 
@@ -46,10 +53,16 @@ class Db {
 
   /// get db size in bytes
   Future<int> getDbSize() async {
-    final int cnt = (await Db().db().rawQuery("pragma page_count;"))[0]
-        ["page_count"] as int;
+    final batch = _db.batch();
+    batch.rawQuery("pragma page_count;");
+    batch.rawQuery("pragma page_size;");
+    final result = (await batch.commit(noResult: false));
+    print(result);
+
+    final int cnt =
+        ((result[0] as List<Map<String, dynamic>>)[0]["page_count"] as int);
     final int pagesize =
-        (await Db().db().rawQuery("pragma page_size;"))[0]["page_size"] as int;
+        (result[1] as List<Map<String, dynamic>>)[0]["page_size"] as int;
     return cnt * pagesize;
   }
 

lib/db/settings_db.dart

@@ -0,0 +1,51 @@
+import 'database.dart';
+
+class SettingsT {
+  String domain;
+  String token;
+  String videopath;
+  int tilewidth;
+
+  SettingsT(this.domain, this.token, this.videopath, this.tilewidth);
+}
+
+class SettingsDB {
+  static final SettingsDB _instance = SettingsDB._();
+
+  SettingsT _settings = SettingsT("", "", "", 0);
+  bool _initialized = false;
+
+  Future<SettingsT> getSettings() async {
+    if (!_initialized) {
+      final result = (await Db().db().query("settings",
+              where: "1",
+              columns: ["domain", "token", "videopath", "tilewidth"]))
+          .first;
+
+      _settings = SettingsT(
+          result["domain"] as String,
+          result["token"] as String,
+          result["videopath"] as String,
+          result["tilewidth"] as int);
+    }
+    return _settings;
+  }
+
+  Future<void> setSettings(SettingsT settings) async {
+    await Db().db().update(
+        "settings",
+        {
+          "domain": settings.domain,
+          "token": settings.token,
+          "videopath": settings.videopath,
+          "tilewidth": settings.tilewidth
+        },
+        where: "1");
+  }
+
+  static SettingsDB getInstance() {
+    return _instance;
+  }
+
+  SettingsDB._();
+}