Add basic database import button

Still need to make sure we move across sets -> gym_sets
since moor won't let me use sets as a table name.

Moor doesnt like me having a class called sets with a property
called sets.

lib/database.dart

@@ -23,7 +23,7 @@ class MyDatabase extends _$MyDatabase {
   MigrationStrategy get migration => MigrationStrategy(
         onCreate: (Migrator m) async {
           await m.createAll();
-          var data = await db.select(db.settings).get();
+          var data = await (db.select(db.settings)..limit(1)).get();
           if (data.isEmpty) await db.into(db.settings).insert(defaultSettings);
         },
         onUpgrade: (Migrator m, int from, int to) async {

lib/settings_page.dart

@@ -1,9 +1,14 @@
+import 'dart:io';
+
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/material.dart' as material;
 import 'package:fmassive/database.dart';
 import 'package:fmassive/main.dart';
 import 'package:fmassive/sound_picker.dart';
 import 'package:moor/moor.dart';
+import 'package:path/path.dart';
+import 'package:sqflite/sqflite.dart';
 
 class SettingsPage extends StatelessWidget {
   const SettingsPage({super.key, required this.search});
@@ -57,6 +62,7 @@ class _SettingsPageState extends State<_SettingsPage> {
             {'title': 'Show Unit', 'value': settings.showUnit},
             {'title': 'Steps', 'value': settings.steps},
             {'title': 'Sound', 'value': settings.sound},
+            {'title': 'Import', 'value': settings.sound},
           ]
               .where((item) => (item['title'] as String)
                   .toLowerCase()
@@ -71,6 +77,29 @@ class _SettingsPageState extends State<_SettingsPage> {
                   itemBuilder: (context, index) {
                     final item = filteredItems[index];
 
+                    if (item['title'] == 'Import')
+                      return Center(
+                          child: ElevatedButton(
+                              onPressed: () async {
+                                final result =
+                                    await FilePicker.platform.pickFiles(
+                                  type: FileType.any,
+                                );
+                                if (result == null) return;
+
+                                final file = File(result.files.single.path!);
+                                final path = await getDatabasesPath();
+                                final to = join(path, 'massive.db');
+                                await db.close();
+                                await file.copy(to);
+                                print('Migrating...');
+                                db = MyDatabase();
+                                final migrator = db.createMigrator();
+                                await migrator.createAll();
+                                print('Migrated.');
+                              },
+                              child: const Text("Import")));
+
                     if (item['title'] == 'Sound') {
                       return Center(
                         child: SoundPicker(