added DatePicker, fixed provider.watch on CarDetailScreen,

new txn now updates car mileage

lib/bups/main-20221109.dart

@@ -0,0 +1,911 @@
+import 'dart:collection';
+import 'package:dash/utils/dbhelper_sqflite.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+// import 'package:path/path.dart';
+// import 'package:sqflite/sqflite.dart';
+import 'package:dash/models/car.dart';
+import 'package:dash/models/txn.dart';
+// import 'package:flutter/src/widgets/form.dart';
+
+void main() async {
+  runApp(
+    ChangeNotifierProvider(
+      create: (context) => GarageModel(),
+      child: const MaterialApp(
+        title: 'Dashboard',
+        home: MyApp(),
+        /* initialRoute: '/',
+        routes: {
+          '/': (context) => const MyApp(),
+          '/about': (context) => const AboutScreen(),
+          '/newcar': (context) => const NewCarScreen(),
+          '/detail': (context) => const CarDetailScreen(),
+          '/edit': (context) => EditCarScreen(),
+        }, */
+      ),
+    ),
+  );
+  // WidgetsFlutterBinding.ensureInitialized(); // is this necessary?
+}
+
+class GarageModel extends ChangeNotifier {
+  /// internal state of garage
+  late List<Car> _cars = [];
+  late List<Txn> _txns = []; // hold current car txns, repl on new load
+  final DbHelperSqlite _dbHelper = DbHelperSqlite.instance;
+  UnmodifiableListView<Car> get cars => UnmodifiableListView(_cars);
+  UnmodifiableListView<Txn> get txns => UnmodifiableListView(_txns);
+
+  void add(Car car) {
+    // _cars.add(car);
+    _dbHelper.insertCar(car);
+    getCars(); // prob nec to update `id`
+    notifyListeners();
+  }
+
+  void update(Car car, int carIndex) {
+    _cars[carIndex] = car; // replace list car with new values
+    _dbHelper.updateCar(car);
+    print('updated car ${car.toMap()}');
+    getCars();
+    // print(_cars);
+    notifyListeners();
+  }
+
+  void delete(Car car) {
+    // ignore: no_leading_underscores_for_local_identifiers
+    _cars.removeWhere((_car) => _car.id == car.id);
+    _dbHelper.deleteCar(car);
+    print('$car with id ${car.id} deleted');
+    getCars();
+    notifyListeners();
+  }
+
+  void clearCarList() {
+    // clear _cars; doesn't affect database
+    // useful for clearing cars that didn't make it into the db
+    _cars.clear();
+    notifyListeners();
+  }
+
+  void deleteAllCars() {
+    // delete rows from CarTable
+    _cars.clear();
+    _dbHelper.deleteAll();
+    notifyListeners();
+  }
+
+  Future<void> getCars() async {
+    // _cars.clear();
+    print('getcars');
+    _cars = await _dbHelper.fetchCars();
+    print(_cars);
+    // notifyListeners(); //for some reason this inits db infinitely
+  }
+
+  void insertTxn(Txn txn) async {
+    await _dbHelper.insertTxn(txn);
+    // update car
+    await getTxns(txn.carid!);
+    notifyListeners();
+  }
+
+  void deleteTxn(Txn txn) {
+    _dbHelper.deleteTxn(txn);
+    // get old mileage from car
+    notifyListeners();
+  }
+
+  Future<void> getTxns(int carid) async {
+    _txns = await _dbHelper.fetchTxns(carid);
+    print('get txns: $_txns');
+  }
+}
+
+class Garage extends StatefulWidget {
+  const Garage({super.key});
+  @override
+  State<Garage> createState() => _Garage();
+}
+
+class _Garage extends State<Garage> {
+  late Future _cars;
+
+  @override
+  void initState() {
+    _cars = Provider.of<GarageModel>(context, listen: false).getCars();
+    // _cars = Provider.of<GarageModel>(context).getCars();
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+      future: _cars,
+      builder: (context, snapshot) {
+        if (snapshot.connectionState == ConnectionState.waiting) {
+          return const Center(
+            child: CircularProgressIndicator(),
+          );
+        } else {
+          if (snapshot.error != null) {
+            return const Center(
+              child: Text('An error occurred'),
+            );
+          } else {
+            return Expanded(
+                child: Consumer<GarageModel>(builder: (context, garage, child) {
+              return ListView.separated(
+                // padding: const EdgeInsets.all(8),
+                itemCount: garage._cars.length,
+                itemBuilder: (context, index) => ListTile(
+                  leading: const Icon(Icons.directions_car),
+                  title: Text(garage.cars[index].nickname ?? "nick_ph"),
+                  subtitle: Text(garage.cars[index].vin ?? "vin_ph"),
+/*                   trailing: IconButton(
+                    onPressed: Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => EditCarScreen(
+                              car: garage._cars[index], carIndex: index)),
+                    ),
+                    icon: Icons.edit),
+                    ),
+                  onTap: () => Navigator.pushNamed(context, '/detail'), */
+                  onTap: () {
+                    Navigator.of(context).push(
+                      // context,
+                      MaterialPageRoute(
+                        builder: (context) => CarDetailScreen(carIndex: index),
+                      ),
+                    );
+                  },
+                ),
+                separatorBuilder: (BuildContext context, int index) =>
+                    const Divider(),
+              );
+            }));
+          }
+        }
+      },
+    );
+  }
+}
+
+class CurrentCar extends StatefulWidget {
+  CurrentCar({super.key, required this.car});
+  Car car;
+
+  @override
+  State<CurrentCar> createState() => _CurrentCar();
+}
+
+class _CurrentCar extends State<CurrentCar> {
+  late Future _txns;
+  late Car car = widget.car;
+
+  @override
+  void initState() {
+    _txns = Provider.of<GarageModel>(context, listen: false).getTxns(car.id!);
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+        future: _txns,
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return const Center(
+              child: CircularProgressIndicator(),
+            );
+          } else {
+            if (snapshot.error != null) {
+              return const Center(
+                child: Text('An error occurred'),
+              );
+            } else {
+              return Expanded(child: Consumer<GarageModel>(
+                builder: (context, garage, child) {
+                  return ListView.separated(
+                    // padding: const EdgeInsets.all(8),
+                    itemCount: garage.txns.length,
+                    itemBuilder: (context, index) => ListTile(
+                        // dense: true,
+                        visualDensity:
+                            const VisualDensity(horizontal: 0, vertical: -4),
+                        leading: const Icon(Icons.local_gas_station),
+                        // leading: const Icon(Icons.build),
+                        title: Text(garage.txns[index].txntype ?? "type"),
+                        subtitle: Text(garage.txns[index].note ?? "note"),
+                        onTap: (() => VoidCallback)),
+                    separatorBuilder: (BuildContext context, int index) =>
+                        const Divider(),
+                  );
+                },
+              ));
+            }
+          }
+        });
+  }
+}
+
+class MyDrawer extends StatelessWidget {
+  const MyDrawer({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Drawer(
+      child: ListView(
+        padding: EdgeInsets.zero,
+        children: <Widget>[
+          const SizedBox(
+            height: 80.0,
+            child: DrawerHeader(
+              decoration: BoxDecoration(
+                color: Color.fromARGB(255, 185, 47, 5),
+              ),
+              child: Text(
+                'Options',
+                style: TextStyle(
+                  color: Colors.white,
+                  fontSize: 18,
+                ),
+              ),
+            ),
+          ),
+          ListTile(
+            leading: const Icon(Icons.settings),
+            title: const Text('Settings'),
+            onTap: () {
+              print('settings');
+            },
+            // do something
+          ),
+          ListTile(
+            leading: const Icon(Icons.sync),
+            title: const Text('Setup Database'),
+            onTap: () {
+              print('dbsetup');
+            },
+          ),
+          ListTile(
+            leading: const Icon(Icons.info_outline),
+            title: const Text('About'),
+            onTap: () {
+              Navigator.of(context).push(
+                  MaterialPageRoute(builder: (context) => const AboutScreen()));
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class MyApp extends StatefulWidget {
+  const MyApp({super.key});
+
+  @override
+  State<MyApp> createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  @override
+  Widget build(BuildContext context) {
+    var garage = context.watch<GarageModel>(); // testing
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: const Color.fromARGB(255, 185, 47, 5),
+        title: const Text('Dashboard'),
+      ),
+      drawer: const MyDrawer(),
+      body: Container(
+        padding: const EdgeInsets.all(32),
+        child: Column(
+          children: [
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 4.0),
+              child: ElevatedButton(
+                onPressed: (() => garage.clearCarList()),
+                // onPressed: (() => VoidCallback),
+                onLongPress: () {
+                  garage.deleteAllCars();
+                  // VoidCallback;
+                },
+                child: Row(
+                  children: const <Widget>[
+                    Icon(Icons.delete),
+                    Text('Remove All Cars'),
+                  ],
+                ),
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 4.0),
+              child: ElevatedButton(
+                onPressed: (() => garage.getCars()),
+                // onPressed: (() => VoidCallback),
+                child: Row(
+                  children: const <Widget>[
+                    Icon(Icons.sync),
+                    Text('Refresh garage'),
+                  ],
+                ),
+              ),
+            ),
+            const Garage(), // list of cars in garage
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        child: const Icon(Icons.add),
+        onPressed: () {
+          Navigator.push(context,
+              MaterialPageRoute(builder: (context) => const NewCarScreen()));
+        },
+      ),
+    );
+  }
+}
+
+class AboutScreen extends StatelessWidget {
+  // change to AboutDialog
+  const AboutScreen(
+      {super.key}); //https://api.flutter.dev/flutter/material/AboutDialog-class.html
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: const Text('About Page'),
+          backgroundColor: const Color.fromARGB(255, 185, 47, 5),
+        ),
+        body: const Center(
+          child: Text('About Page Text, Lorum Ipsum and whatnot.'),
+        ));
+  }
+}
+
+class NewCarScreen extends StatefulWidget {
+  const NewCarScreen({super.key});
+
+  @override
+  State<NewCarScreen> createState() => _NewCarScreenState();
+}
+
+class _NewCarScreenState extends State<NewCarScreen> {
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  Car _car = Car(); //initialization is required
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Add New Car'),
+        backgroundColor: Colors.indigo,
+      ),
+      body: Container(
+        padding: const EdgeInsets.all(32),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              //new car form text fields
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Nickname',
+                ),
+                onSaved: (val) => setState(() => _car.nickname = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a nickname';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'VIN',
+                ),
+                onSaved: (val) => setState(() => _car.vin = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a unique VIN';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'License Plate',
+                ),
+                onSaved: (val) => setState(() => _car.plate = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a license plate';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Mileage',
+                ),
+                onSaved: (val) =>
+                    setState(() => _car.mileage = int.parse(val ?? "")),
+                // inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter.digitsOnly]  //try this?
+                keyboardType: TextInputType.number,
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter car\'s current mileage';
+                  }
+                  return null;
+                },
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 16.0),
+                child: ElevatedButton(
+                  // onPressed: () => _onSubmit(context),
+                  onPressed: () {
+                    final _form = _formKey.currentState!;
+                    if (_form.validate()) {
+                      //validate form
+                      _form
+                          .save(); //save values (reqd before putting them anywhere)
+                      setState(() {
+                        //modify state of car (necessary?)
+                        _car = Car(
+                            vin: _car.vin,
+                            nickname: _car.nickname,
+                            plate: _car.plate,
+                            mileage: _car.mileage);
+                      });
+                      var garage =
+                          context.read<GarageModel>(); //implement Provider
+                      garage.add(_car);
+                      _form.reset();
+                      Navigator.pushNamed(context, '/');
+                    }
+                  },
+                  child: Row(
+                    children: const <Widget>[
+                      Icon(Icons.add),
+                      Text('Add Car'),
+                    ],
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  _onSubmit(context) async {
+    final _form = _formKey.currentState!;
+    if (_form.validate()) {
+      //validate form
+      _form.save(); //save values (reqd before putting them anywhere)
+      setState(() {
+        //modify state of car (necessary?)
+        _car = Car(
+            vin: _car.vin,
+            nickname: _car.nickname,
+            plate: _car.plate,
+            mileage: _car.mileage);
+      });
+      var garage = context.read<GarageModel>(); //implement Provider
+      garage.add(_car);
+      _form.reset();
+      Navigator.pushNamed(context, '/');
+    }
+  }
+}
+
+class CarDetailScreen extends StatelessWidget {
+  // const CarDetailScreen({super.key, required this.car, required this.carIndex});
+  CarDetailScreen({super.key, required this.carIndex});
+  final int carIndex; //pass this thru for edit screen
+  // late Car car;
+
+  @override
+  Widget build(BuildContext context) {
+    late Car car = context.read<GarageModel>()._cars[carIndex];
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: const Color.fromARGB(255, 185, 47, 5),
+        title: Text(car.nickname ?? ""),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+              children: [
+                const Text("plh img picker"),
+                Center(
+                  // edit car screen
+                  child: Ink(
+                    decoration: const ShapeDecoration(
+                        color: Colors.lightBlue, shape: CircleBorder()),
+                    child: IconButton(
+                      icon: const Icon(Icons.edit),
+                      color: Colors.white,
+                      onPressed: () {
+                        Navigator.push(
+                          context,
+                          MaterialPageRoute(
+                              builder: (context) =>
+                                  EditCarScreen(car: car, carIndex: carIndex)),
+                        );
+                      },
+                    ),
+                  ),
+                ),
+              ],
+            ),
+            IconButton(
+              iconSize: 48.0,
+              icon: const Icon(Icons.directions_car),
+              onPressed: (() => VoidCallback),
+            ),
+            Text("Nickname: ${car.nickname}"),
+            Text("VIN: ${car.vin}"),
+            Text("License Plate: ${car.plate}"),
+            Text("Mileage: ${car.mileage.toString()}"),
+            CurrentCar(car: car),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        // add txn
+        onPressed: () {
+          Navigator.of(context).push(
+            // context,
+            MaterialPageRoute(
+              builder: (context) => NewTxn(
+                  car: car,
+                  carIndex: carIndex), //add car index so you can update?
+            ),
+          );
+        },
+        child: const Icon(Icons.edit),
+      ),
+    );
+  }
+}
+
+class EditCarScreen extends StatefulWidget {
+  EditCarScreen({super.key, required this.car, required this.carIndex});
+  Car car;
+  int carIndex;
+
+  @override
+  State<EditCarScreen> createState() => _EditCarScreenState();
+}
+
+class _EditCarScreenState extends State<EditCarScreen> {
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  late Car car = widget.car; //initialization is required
+  late int carIndex = widget.carIndex;
+
+  @override
+  Widget build(BuildContext context) {
+    var garage = context.read<GarageModel>();
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Edit ${car.nickname}"),
+        backgroundColor: const Color.fromARGB(255, 185, 47, 5),
+      ),
+      body: Container(
+        padding: const EdgeInsets.all(16),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              //new car form text fields
+              TextFormField(
+                initialValue: car.nickname,
+                decoration: const InputDecoration(
+                  labelText: 'Nickname',
+                ),
+                onSaved: (val) => setState(() => car.nickname = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a nickname';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                initialValue: car.vin,
+                decoration: const InputDecoration(
+                  labelText: 'VIN',
+                ),
+                onSaved: (val) => setState(() => car.vin = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a unique VIN';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                initialValue: car.plate,
+                decoration: const InputDecoration(
+                  labelText: 'License Plate',
+                ),
+                onSaved: (val) => setState(() => car.plate = val),
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter a license plate';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                initialValue: car.mileage.toString(),
+                decoration: const InputDecoration(
+                  labelText: 'Mileage',
+                ),
+                onSaved: (val) =>
+                    setState(() => car.mileage = int.parse(val ?? "")),
+                // inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter.digitsOnly]  //try this?
+                keyboardType: TextInputType.number,
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please enter car\'s current mileage';
+                  }
+                  return null;
+                },
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 4.0),
+                child: ElevatedButton(
+                  onPressed: () {
+                    final updateForm = _formKey.currentState!;
+                    if (updateForm.validate()) {
+                      //validate form
+                      updateForm
+                          .save(); //save values (reqd before putting them anywhere)
+                      garage.update(car, carIndex);
+                      updateForm.reset();
+                      Navigator.pushNamed(context, '/');
+                    }
+                  },
+                  child: Row(
+                    children: const <Widget>[
+                      //expand these children, too tight
+                      Icon(Icons.save),
+                      Text('Save Changes'),
+                    ],
+                  ),
+                ),
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 4.0),
+                child: ElevatedButton(
+                  onPressed: (() => VoidCallback),
+                  onLongPress: () {
+                    garage.delete(car);
+                    Navigator.pushNamed(context, '/');
+                  },
+                  child: Row(children: const <Widget>[
+                    Icon(Icons.delete),
+                    Text('Delete'),
+                  ]),
+                ),
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 4.0),
+                child: ElevatedButton(
+                  onPressed: (() => VoidCallback),
+                  child: Row(children: const <Widget>[
+                    Icon(Icons.sync_alt),
+                    Text('enable/disable'),
+                  ]),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class NewTxn extends StatefulWidget {
+  NewTxn({super.key, required this.car, required this.carIndex});
+  Car car;
+  int carIndex;
+
+  @override
+  State<NewTxn> createState() => _NewTxnState();
+}
+
+class _NewTxnState extends State<NewTxn> {
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  late Car car = widget.car;
+  late int carIndex = widget.carIndex;
+  DateTime datetime = DateTime.now();
+  Txn txn = Txn();
+
+  Future<void> _selectDate(BuildContext context) async {
+    final DateTime? timepicked = await showDatePicker(
+        context: context,
+        initialDate: datetime,
+        firstDate: DateTime.utc(1776, 7, 4),
+        lastDate: DateTime.utc(2222, 2, 22));
+    if (timepicked != null && timepicked != datetime) {
+      setState(() => datetime = timepicked);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Add new txn for ${car.nickname}"),
+        backgroundColor: const Color.fromARGB(255, 185, 47, 5),
+      ),
+      body: Container(
+        padding: const EdgeInsets.all(16),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              // txntype - change to dropdown
+
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Type',
+                ),
+                onSaved: (val) => setState(() => txn.txntype = val),
+              ),
+              Row(
+                children: [
+                  Flexible(
+                    flex: 1,
+                    child: IconButton(
+                        onPressed: () => _selectDate(context),
+                        icon: const Icon(Icons.calendar_month)),
+                  ),
+                  Flexible(
+                    flex: 3,
+                    child: InputDatePickerFormField(
+                        firstDate: DateTime.utc(1776, 7, 4),
+                        lastDate: DateTime.utc(2222, 2, 22),
+                        initialDate: datetime,
+                        onDateSaved: (val) => setState(
+                            () => txn.datetime = val.millisecondsSinceEpoch)),
+                  ),
+                ],
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Cost',
+                ),
+                onSaved: (val) =>
+                    setState(() => txn.cost = double.parse(val ?? "")),
+                keyboardType: TextInputType.number,
+              ),
+              TextFormField(
+                initialValue: car.mileage.toString(),
+                decoration: const InputDecoration(
+                  labelText: 'Mileage',
+                ),
+                onSaved: (val) =>
+                    setState(() => txn.mileage = int.parse(val ?? "")),
+                keyboardType: TextInputType.number,
+                validator: (String? value) {
+                  if (value == null || value.isEmpty) {
+                    return "Must be >= current mileage";
+                  } else if (int.parse(value) < car.mileage!.toInt()) {
+                    return 'Must be >= current mileage';
+                  }
+                  return null;
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Note',
+                ),
+                onSaved: (val) => setState(() => txn.note = val),
+              ),
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 4.0),
+                child: ElevatedButton(
+                  onPressed: () {
+                    final form = _formKey.currentState!;
+                    if (form.validate()) {
+                      form.save();
+                      setState(() {
+                        txn.datetime = DateTime.now().millisecondsSinceEpoch;
+                        txn.carid = car.id;
+                        car.mileage = txn.mileage; // update car mileage too
+                      });
+                      var garage = context.read<GarageModel>();
+                      garage.update(car, carIndex);
+                      print(txn.toMap());
+                      garage.insertTxn(txn);
+                      form.reset();
+                      Navigator.of(context).push(
+                        MaterialPageRoute(
+                          builder: (context) =>
+                              CarDetailScreen(carIndex: carIndex),
+                        ),
+                      );
+                      // Navigator.of(context).pop();
+                    }
+                  },
+                  child: Row(
+                    children: const <Widget>[
+                      //expand these children, too tight
+                      Icon(Icons.save),
+                      Text('Save Changes'),
+                    ],
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+/* class MyDatePicker extends StatefulWidget {
+  const MyDatePicker({super.key});
+  @override
+  State<MyDatePicker> createState() => _MyDatePicker();
+}
+
+class _MyDatePicker extends State<MyDatePicker> {
+  @override
+  Widget build(BuildContext context) {
+    return Row(children: [
+      Flexible(
+        flex: 1,
+        child: IconButton(
+            onPressed: () async {
+              showDatePicker(
+                  context: context,
+                  initialDate: DateTime.now(),
+                  firstDate: DateTime.utc(1776, 7, 4),
+                  lastDate: DateTime.utc(2222, 2, 22));
+            },
+            icon: const Icon(Icons.calendar_month)),
+      ),
+      Flexible(
+        flex: 3,
+        child: InputDatePickerFormField(
+            firstDate: DateTime.utc(1776, 7, 4),
+            lastDate: DateTime.utc(2222, 2, 22),
+            initialDate: DateTime.now(),
+            onDateSaved: (val) =>
+                setState(() => txn.datetime = val.millisecondsSinceEpoch)),
+      ),
+    ]);
+  }
+} */
+
+/* class IconPicker extends SimpleDialog {
+  IconPicker({super.key})
+
+  @override
+  Widget build (BuildContext context) {
+    return SimpleDialog(
+      title: const Text("Pick an icon"),
+
+    );
+  }
+} */

lib/main.dart

@@ -20,7 +20,7 @@ void main() async {
           '/': (context) => const MyApp(),
           '/about': (context) => const AboutScreen(),
           '/newcar': (context) => const NewCarScreen(),
-          '/detail': (context) => const CarDetailScreen(),
+          '/detail': (context) => CarDetailScreen(),
           '/edit': (context) => EditCarScreen(),
         }, */
       ),
@@ -32,8 +32,10 @@ void main() async {
 class GarageModel extends ChangeNotifier {
   /// internal state of garage
   late List<Car> _cars = [];
+  late List<Txn> _txns = []; // hold current car txns, repl on new load
   final DbHelperSqlite _dbHelper = DbHelperSqlite.instance;
   UnmodifiableListView<Car> get cars => UnmodifiableListView(_cars);
+  UnmodifiableListView<Txn> get txns => UnmodifiableListView(_txns);
 
   void add(Car car) {
     // _cars.add(car);
@@ -81,6 +83,24 @@ class GarageModel extends ChangeNotifier {
     print(_cars);
     // notifyListeners(); //for some reason this inits db infinitely
   }
+
+  void insertTxn(Txn txn) async {
+    await _dbHelper.insertTxn(txn);
+    // update car
+    await getTxns(txn.carid!);
+    notifyListeners();
+  }
+
+  void deleteTxn(Txn txn) {
+    _dbHelper.deleteTxn(txn);
+    // get old mileage from car
+    notifyListeners();
+  }
+
+  Future<void> getTxns(int carid) async {
+    _txns = await _dbHelper.fetchTxns(carid);
+    print('get txns: $_txns');
+  }
 }
 
 class Garage extends StatefulWidget {
@@ -95,7 +115,6 @@ class _Garage extends State<Garage> {
   @override
   void initState() {
     _cars = Provider.of<GarageModel>(context, listen: false).getCars();
-    // _cars = Provider.of<GarageModel>(context).getCars();
     super.initState();
   }
 
@@ -117,30 +136,19 @@ class _Garage extends State<Garage> {
             return Expanded(
                 child: Consumer<GarageModel>(builder: (context, garage, child) {
               return ListView.separated(
-                // padding: const EdgeInsets.all(8),
                 itemCount: garage._cars.length,
                 itemBuilder: (context, index) => ListTile(
                   leading: const Icon(Icons.directions_car),
                   title: Text(garage.cars[index].nickname ?? "nick_ph"),
                   subtitle: Text(garage.cars[index].vin ?? "vin_ph"),
-/*                   trailing: IconButton(
-                    onPressed: Navigator.push(
-                      context,
-                      MaterialPageRoute(
-                          builder: (context) => EditCarScreen(
-                              car: garage._cars[index], carIndex: index)),
-                    ),
-                    icon: Icons.edit),
-                    ),
-                  onTap: () => Navigator.pushNamed(context, '/detail'), */
                   onTap: () {
-                    Navigator.of(context).push(
+                    Navigator.of(context)
-                      // context,
+                        .push(
                             MaterialPageRoute(
-                        builder: (context) => CarDetailScreen(
+                          builder: (context) =>
-                            car: garage._cars[index], carIndex: index),
+                              CarDetailScreen(carIndex: index),
-                      ),
+                        ))
-                    );
+                        .then((value) => setState(() {}));
                   },
                 ),
                 separatorBuilder: (BuildContext context, int index) =>
@@ -154,6 +162,63 @@ class _Garage extends State<Garage> {
   }
 }
 
+class CurrentCar extends StatefulWidget {
+  CurrentCar({super.key, required this.car});
+  Car car;
+
+  @override
+  State<CurrentCar> createState() => _CurrentCar();
+}
+
+class _CurrentCar extends State<CurrentCar> {
+  late Future _txns;
+  late Car car = widget.car;
+
+  @override
+  void initState() {
+    _txns = Provider.of<GarageModel>(context, listen: false).getTxns(car.id!);
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+        future: _txns,
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return const Center(
+              child: CircularProgressIndicator(),
+            );
+          } else {
+            if (snapshot.error != null) {
+              return const Center(
+                child: Text('An error occurred'),
+              );
+            } else {
+              return Expanded(child: Consumer<GarageModel>(
+                builder: (context, garage, child) {
+                  return ListView.separated(
+                    // padding: const EdgeInsets.all(8),
+                    itemCount: garage.txns.length,
+                    itemBuilder: (context, index) => ListTile(
+                        // dense: true, //only affects text, use visualDensity instead
+                        visualDensity:
+                            const VisualDensity(horizontal: 0, vertical: -4),
+                        leading: const Icon(Icons.local_gas_station),
+                        title: Text(garage.txns[index].txntype ?? "type"),
+                        subtitle: Text(garage.txns[index].note ?? "note"),
+                        onTap: (() => VoidCallback)),
+                    separatorBuilder: (BuildContext context, int index) =>
+                        const Divider(),
+                  );
+                },
+              ));
+            }
+          }
+        });
+  }
+}
+
 class MyDrawer extends StatelessWidget {
   const MyDrawer({super.key});
 
@@ -387,7 +452,7 @@ class _NewCarScreenState extends State<NewCarScreen> {
                             mileage: _car.mileage);
                       });
                       var garage =
-                          context.read<GarageModel>(); //implement Provider
+                          context.read<GarageModel>();
                       garage.add(_car);
                       _form.reset();
                       Navigator.pushNamed(context, '/');
@@ -429,14 +494,18 @@ class _NewCarScreenState extends State<NewCarScreen> {
   }
 }
 
-class CarDetailScreen extends StatelessWidget {
+class CarDetailScreen extends StatefulWidget {
-  const CarDetailScreen({super.key, required this.car, required this.carIndex});
+  CarDetailScreen({super.key, required this.carIndex});
-  final Car car;
+  final int carIndex;
-  final int carIndex; //pass this thru for edit screen
+  @override
+  State<CarDetailScreen> createState() => _CarDetailScreenState();
+}
+
+class _CarDetailScreenState extends State<CarDetailScreen> {
+  late Car car = context.watch<GarageModel>()._cars[widget.carIndex];
 
   @override
   Widget build(BuildContext context) {
-    // const Car car = context.read<GarageModel>()._cars[index];
     return Scaffold(
       appBar: AppBar(
         backgroundColor: const Color.fromARGB(255, 185, 47, 5),
@@ -452,18 +521,19 @@ class CarDetailScreen extends StatelessWidget {
               children: [
                 const Text("plh img picker"),
                 Center(
+                  // edit car screen
                   child: Ink(
                     decoration: const ShapeDecoration(
                         color: Colors.lightBlue, shape: CircleBorder()),
                     child: IconButton(
                       icon: const Icon(Icons.edit),
                       color: Colors.white,
-                      onPressed: () {
+                      onPressed: () async {
-                        Navigator.push(
+                        await Navigator.push(
                           context,
                           MaterialPageRoute(
-                              builder: (context) =>
+                              builder: (context) => EditCarScreen(
-                                  EditCarScreen(car: car, carIndex: carIndex)),
+                                  car: car, carIndex: widget.carIndex)),
                         );
                       },
                     ),
@@ -480,12 +550,21 @@ class CarDetailScreen extends StatelessWidget {
             Text("VIN: ${car.vin}"),
             Text("License Plate: ${car.plate}"),
             Text("Mileage: ${car.mileage.toString()}"),
+            CurrentCar(car: car),
           ],
         ),
       ),
       floatingActionButton: FloatingActionButton(
-        child: const Icon(Icons.edit),
+        onPressed: () {
-        onPressed: (() => VoidCallback), //add Transaction
+          Navigator.of(context).push(
+            MaterialPageRoute(
+              builder: (context) => NewTxn(
+                  car: car,
+                  carIndex: widget.carIndex),
+            ),
+          );
+        },
+        child: const Icon(Icons.add),
       ),
     );
   }
@@ -502,7 +581,7 @@ class EditCarScreen extends StatefulWidget {
 
 class _EditCarScreenState extends State<EditCarScreen> {
   final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
-  late Car car = widget.car; //initialization is required
+  late Car car = widget.car;
   late int carIndex = widget.carIndex;
 
   @override
@@ -520,7 +599,6 @@ class _EditCarScreenState extends State<EditCarScreen> {
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: <Widget>[
-              //new car form text fields
               TextFormField(
                 initialValue: car.nickname,
                 decoration: const InputDecoration(
@@ -585,15 +663,6 @@ class _EditCarScreenState extends State<EditCarScreen> {
                       //validate form
                       updateForm
                           .save(); //save values (reqd before putting them anywhere)
-/*                       setState(() {
-                        //modify state of car (necessary?)
-                        car = garage._cars[carIndex];
-                        car
-                            vin: car.vin,
-                            nickname: car.nickname,
-                            plate: car.plate,
-                            mileage: car.mileage); 
-                      }); //implement Provider */
                       garage.update(car, carIndex);
                       updateForm.reset();
                       Navigator.pushNamed(context, '/');
@@ -641,8 +710,9 @@ class _EditCarScreenState extends State<EditCarScreen> {
 }
 
 class NewTxn extends StatefulWidget {
-  NewTxn({super.key, required this.car});
+  NewTxn({super.key, required this.car, required this.carIndex});
   Car car;
+  int carIndex;
 
   @override
   State<NewTxn> createState() => _NewTxnState();
@@ -650,14 +720,28 @@ class NewTxn extends StatefulWidget {
 
 class _NewTxnState extends State<NewTxn> {
   final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
-  late Car car = widget.car; //initialization is required
+  late Car car = widget.car;
+  late int carIndex = widget.carIndex;
+  DateTime datetime = DateTime.now();
   Txn txn = Txn();
+  bool refresh = false;
+
+  Future<void> _selectDate(BuildContext context) async {
+    final DateTime? timepicked = await showDatePicker(
+        context: context,
+        initialDate: datetime,
+        firstDate: DateTime.utc(1776, 7, 4),
+        lastDate: DateTime.utc(2222, 2, 22));
+    if (timepicked != null && timepicked != datetime) {
+      setState(() => datetime = timepicked);
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Edit ${car.nickname}"),
+        title: Text("Add new txn for ${car.nickname}"),
         backgroundColor: const Color.fromARGB(255, 185, 47, 5),
       ),
       body: Container(
@@ -667,35 +751,41 @@ class _NewTxnState extends State<NewTxn> {
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: <Widget>[
-              //new car form text fields
+              // txntype - change to dropdown
-              /* RadioListTile(
+
-                value: ,
-              ), */
               TextFormField(
-                initialValue: car.vin,
                 decoration: const InputDecoration(
-                  labelText: 'VIN',
+                  labelText: 'Type',
                 ),
-                onSaved: (val) => setState(() => car.vin = val),
+                onSaved: (val) => setState(() => txn.txntype = val),
-                validator: (String? value) {
+              ),
-                  if (value == null || value.isEmpty) {
+              Row(
-                    return 'Please enter a unique VIN';
+                children: [
-                  }
+                  Flexible(
-                  return null;
+                    flex: 1,
-                },
+                    child: IconButton(
+                        onPressed: () => _selectDate(context),
+                        icon: const Icon(Icons.calendar_month)),
+                  ),
+                  Flexible(
+                    flex: 3,
+                    child: InputDatePickerFormField(
+                        firstDate: DateTime.utc(1776, 7, 4),
+                        lastDate: DateTime.utc(2222, 2, 22),
+                        initialDate: datetime,
+                        onDateSaved: (val) => setState(
+                            () => txn.datetime = val.millisecondsSinceEpoch)),
+                  ),
+                ],
               ),
               TextFormField(
-                initialValue: car.plate,
                 decoration: const InputDecoration(
-                  labelText: 'License Plate',
+                  labelText: 'Cost',
                 ),
-                onSaved: (val) => setState(() => car.plate = val),
+                initialValue: "0",
-                validator: (String? value) {
+                onSaved: (val) =>
-                  if (value == null || value.isEmpty) {
+                    setState(() => txn.cost = double.parse(val ?? "0")),
-                    return 'Please enter a license plate';
+                keyboardType: TextInputType.number,
-                  }
-                  return null;
-                },
               ),
               TextFormField(
                 initialValue: car.mileage.toString(),
@@ -703,37 +793,41 @@ class _NewTxnState extends State<NewTxn> {
                   labelText: 'Mileage',
                 ),
                 onSaved: (val) =>
-                    setState(() => car.mileage = int.parse(val ?? "")),
+                    setState(() => txn.mileage = int.parse(val ?? "")),
-                // inputFormatters: <TextInputFormatter>[FilteringTextInputFormatter.digitsOnly]  //try this?
                 keyboardType: TextInputType.number,
                 validator: (String? value) {
                   if (value == null || value.isEmpty) {
-                    return 'Please enter car\'s current mileage';
+                    return "Must be >= current mileage";
+                  } else if (int.parse(value) < car.mileage!.toInt()) {
+                    return 'Must be >= current mileage';
                   }
                   return null;
                 },
               ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Note',
+                ),
+                onSaved: (val) => setState(() => txn.note = val),
+              ),
               Padding(
                 padding: const EdgeInsets.symmetric(vertical: 4.0),
                 child: ElevatedButton(
                   onPressed: () {
-                    final updateForm = _formKey.currentState!;
+                    final form = _formKey.currentState!;
-                    if (updateForm.validate()) {
+                    if (form.validate()) {
-                      //validate form
+                      form.save();
-                      updateForm
+                      setState(() {
-                          .save(); //save values (reqd before putting them anywhere)
+                        txn.datetime = DateTime.now().millisecondsSinceEpoch;
-/*                       setState(() {
+                        txn.carid = car.id;
-                        //modify state of car (necessary?)
+                        car.mileage = txn.mileage; // update car mileage too
-                        car = garage._cars[carIndex];
+                      });
-                        car
+                      var garage = context.read<GarageModel>();
-                            vin: car.vin,
-                            nickname: car.nickname,
-                            plate: car.plate,
-                            mileage: car.mileage); 
-                      }); //implement Provider */
                       garage.update(car, carIndex);
-                      updateForm.reset();
+                      print(txn.toMap());
-                      Navigator.pushNamed(context, '/');
+                      garage.insertTxn(txn);
+                      form.reset();
+                      Navigator.pop(context);
                     }
                   },
                   child: Row(
@@ -745,30 +839,6 @@ class _NewTxnState extends State<NewTxn> {
                   ),
                 ),
               ),
-              Padding(
-                padding: const EdgeInsets.symmetric(vertical: 4.0),
-                child: ElevatedButton(
-                  onPressed: (() => VoidCallback),
-                  onLongPress: () {
-                    garage.delete(car);
-                    Navigator.pushNamed(context, '/');
-                  },
-                  child: Row(children: const <Widget>[
-                    Icon(Icons.delete),
-                    Text('Delete'),
-                  ]),
-                ),
-              ),
-              Padding(
-                padding: const EdgeInsets.symmetric(vertical: 4.0),
-                child: ElevatedButton(
-                  onPressed: (() => VoidCallback),
-                  child: Row(children: const <Widget>[
-                    Icon(Icons.sync_alt),
-                    Text('enable/disable'),
-                  ]),
-                ),
-              ),
             ],
           ),
         ),

lib/shared/datepicker.dart

@@ -0,0 +1 @@
+class DateTimePicker extends DateTimePicker {}

lib/utils/dbhelper_sqflite.dart

@@ -35,8 +35,8 @@ class DbHelperSqlite {
   }
 
   Future _onCreate(Database db, int version) async {
-    //docs say to avoid autoincrement
+    //docs say to avoid `autoincrement` kw
-    //looks like this may be a null issue?
+    await db.execute("PRAGMA foreign_keys=ON;");
     await db.execute('''
       CREATE TABLE ${Car.tblCars} (
         ${Car.colId} INTEGER PRIMARY KEY,
@@ -44,6 +44,8 @@ class DbHelperSqlite {
         ${Car.colNickname} TEXT,
         ${Car.colMileage} INTEGER,
         ${Car.colPlate} TEXT);
+        ''');
+    await db.execute('''
       CREATE TABLE ${Txn.tblTxns} (
         ${Txn.colId} INTEGER PRIMARY KEY,
         ${Txn.colType} TEXT,
@@ -51,8 +53,9 @@ class DbHelperSqlite {
         ${Txn.colCost} REAL,
         ${Txn.colMileage} INTEGER,
         ${Txn.colNote} TEXT,
-        FOREIGN KEY(${Txn.colCarId}) REFERENCES ${Car.tblCars}(${Car.colId}),
+        ${Txn.colCarId} INTEGER,
-        )''');
+        FOREIGN KEY(${Txn.colCarId}) REFERENCES ${Car.tblCars}(${Car.colId}));
+        ''');
   }
 
   Future<int> insertCar(Car car) async {
@@ -89,6 +92,47 @@ class DbHelperSqlite {
     Database db = await instance.database as Database;
     return await db.rawDelete("DELETE FROM ${Car.tblCars}");
   }
+
+  Future<int> insertTxn(Txn txn) async {
+    Database db = await instance.database as Database;
+    print('adding txn ${txn.txntype} at ${txn.datetime}');
+    return await db.insert(Txn.tblTxns, txn.toMap(),
+        conflictAlgorithm: ConflictAlgorithm.abort);
+  }
+
+/*   Future<List<Txn>> fetchTxns(int carid, {txntype = '*'}) async {
+    Database db = await instance.database as Database;
+    List<Map<String, dynamic>> txns = await db.query(Txn.tblTxns,
+        where: '${Txn.colCarId}=? and ${Txn.colType}=?',
+        whereArgs: [carid, txntype]);
+    if (txns.isEmpty) {
+      return [];
+    } else {
+      return txns.map((txn) => Txn.fromMap(txn)).toList();
+    }
+  } */
+  Future<List<Txn>> fetchTxns(int carid) async {
+    Database db = await instance.database as Database;
+    List<Map<String, dynamic>> txns = await db
+        .query(Txn.tblTxns, where: '${Txn.colCarId}=?', whereArgs: [carid]);
+    if (txns.isEmpty) {
+      return [];
+    } else {
+      return txns.map((txn) => Txn.fromMap(txn)).toList();
+    }
+  }
+
+  Future<int> deleteTxn(Txn txn) async {
+    Database db = await instance.database as Database;
+    print('txn id to delete: ${txn.id}');
+    return await db
+        .delete(Txn.tblTxns, where: '${Txn.colId}=?', whereArgs: [txn.id]);
+  }
+
+  Future<int> deleteAllTxns() async {
+    Database db = await instance.database as Database;
+    return await db.rawDelete("DELETE FROM ${Txn.tblTxns}");
+  }
 }
 
 // flutter ex: https://docs.flutter.dev/cookbook/persistence/sqlite