Began basic login screen feature (mvp architecture)

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/data/database_helper.dart b/lib/data/database_helper.dart
new file mode 100644
index 0000000..da65dcc
--- /dev/null
+++ b/lib/data/database_helper.dart
@@ -0,0 +1,54 @@
+import 'dart:async';
+import 'dart:io' as io;
+
+import 'package:path/path.dart';
+import 'package:beam_messenger/models/user.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+
+class DatabaseHelper {
+  static final DatabaseHelper _instance = new DatabaseHelper.internal();
+  factory DatabaseHelper() => _instance;
+
+  static Database _db;
+
+  Future<Database> get db async {
+    if (_db != null) return _db;
+    _db = await initDb();
+    return _db;
+  }
+
+  DatabaseHelper.internal();
+
+  initDb() async {
+    io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+    String path = join(documentsDirectory.path, "main.db");
+    var theDb = await openDatabase(path, version: 1, onCreate: _onCreate);
+    return theDb;
+  }
+
+  void _onCreate(Database db, int version) async {
+    // When creating the db, create the table
+    await db.execute(
+        "CREATE TABLE User(id INTEGER PRIMARY KEY, email TEXT, password TEXT)");
+    print("Created tables");
+  }
+
+  Future<int> saveUser(User user) async {
+    var dbClient = await db;
+    int res = await dbClient.insert("User", user.toMap());
+    return res;
+  }
+
+  Future<int> deleteUsers() async {
+    var dbClient = await db;
+    int res = await dbClient.delete("User");
+    return res;
+  }
+
+  Future<bool> isLoggedIn() async {
+    var dbClient = await db;
+    var res = await dbClient.query("User");
+    return res.length > 0 ? true : false;
+  }
+}