Successfully migrate the application to SQLIte!

lib/main.dart

@@ -2,16 +2,36 @@
 import 'package:flutter/material.dart';
 
 // Local
-import '/pages/expense.dart';
-import '/pages/income.dart';
-import '/pages/asset.dart';
-import '/pages/report.dart';
-import '/pages/settings.dart';
-import '/pages/help.dart';
-import '/db.dart';
+import '/pages/home.dart';
+
+// SQLite
+import 'dart:io';
+import 'package:sqflite_common_ffi/sqflite_ffi.dart';
+import 'package:path/path.dart';
+import 'package:path_provider/path_provider.dart';
+
+const bool testing = true;
 
 void main() {
-  loadDB();
+  // I see no good explanations of why to use this other package yet, but
+  // trying this to see if it fixes the DB factory errors.
+  // "Unhandled Exception: Bad state: databaseFactory not initialized databaseFactory is only initialized when using sqflite. When using `sqflite_common_ffi`You must call `databaseFactory = databaseFactoryFfi;` before using global openDatabase API
+  //   https://stackoverflow.com/questions/76158800/databasefactory-not-initialized-when-using-sqflite-in-flutter
+  if (Platform.isWindows || Platform.isLinux) {
+    // Initialize FFI
+    sqfliteFfiInit();
+    databaseFactory = databaseFactoryFfi;
+  }
+  WidgetsFlutterBinding.ensureInitialized();
+
+  if (testing) {
+    () async {
+    Directory documentsDirectory = await getApplicationDocumentsDirectory();
+    String path = join(documentsDirectory.path, 'com_hyperling_expense.db');
+      await deleteDatabase(path);
+    }();
+  }
+
   runApp(const MainApp());
 }
 
@@ -36,110 +56,3 @@ class MainApp extends StatelessWidget {
     );
   }
 }
-
-class HomePage extends StatefulWidget {
-  const HomePage({
-    super.key,
-  });
-
-  @override
-  State<HomePage> createState() => _HomePageState();
-}
-
-class _HomePageState extends State<HomePage> {
-  var pageSelected = 0;
-
-  refresh() {
-    setState(() {});
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    Widget page;
-    Widget? dialog;
-    switch (pageSelected) {
-      case 0:
-        page = ExpensePage();
-        dialog = ExpenseInputDialog(
-          notifyParent: refresh,
-        );
-      case 1:
-        page = IncomePage();
-      case 2:
-        page = AssetPage();
-      case 3:
-        page = ProjectionPage();
-      case 4:
-        page = SettingsPage();
-      case 5:
-        page = HelpPage();
-      default:
-        throw UnimplementedError('No widget for page $pageSelected yet!');
-    }
-
-    Future<void> addNewValue(BuildContext context) {
-      return showDialog(
-        context: context,
-        builder: (_) => AlertDialog(content: dialog),
-      );
-    }
-
-    Widget? floatingButton;
-    if (dialog != null) {
-      floatingButton = IconButton(
-        onPressed: () {
-          addNewValue(context);
-        },
-        icon: Icon(Icons.add),
-        color: Theme.of(context).colorScheme.onSurface,
-      );
-    }
-
-    return LayoutBuilder(builder: (context, constraints) {
-      return Scaffold(
-        appBar: AppBar(title: Text("Expense Tracker")),
-        drawer: NavigationRail(
-          extended: true,
-          destinations: [
-            NavigationRailDestination(
-              icon: Icon(Icons.payment),
-              label: Text('Expenses'),
-            ),
-            NavigationRailDestination(
-              icon: Icon(Icons.account_balance),
-              label: Text('Income'),
-            ),
-            NavigationRailDestination(
-              icon: Icon(Icons.attach_money),
-              label: Text('Liquid Assets'),
-            ),
-            NavigationRailDestination(
-              icon: Icon(Icons.bar_chart),
-              label: Text('Reports'),
-            ),
-            NavigationRailDestination(
-              icon: Icon(Icons.settings),
-              label: Text('Settings'),
-            ),
-            NavigationRailDestination(
-              icon: Icon(Icons.help),
-              label: Text('Help'),
-            ),
-          ],
-          selectedIndex: pageSelected,
-          onDestinationSelected: (value) {
-            setState(() {
-              pageSelected = value;
-              Navigator.pop(context);
-            });
-          },
-        ),
-        body: Container(
-          color: Theme.of(context).colorScheme.primaryContainer,
-          child: Center(child: page),
-        ),
-        floatingActionButton: floatingButton,
-      );
-    });
-  }
-}