proj reorg into folders;

fixed provider implementation;
added TxnType radio picker

lib/screens/txn_new.dart

@@ -0,0 +1,149 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:dash/utils/garage_model.dart';
+import 'package:dash/models/car.dart';
+import 'package:dash/models/txn.dart';
+import 'package:dash/screens/txn_type.dart';
+
+class NewTxnScreen extends StatefulWidget {
+  const NewTxnScreen({super.key, required this.carIndex});
+  final int carIndex;
+
+  @override
+  State<NewTxnScreen> createState() => _NewTxnScreenState();
+}
+
+class _NewTxnScreenState extends State<NewTxnScreen> {
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  late Car car;
+  late int carIndex = widget.carIndex;
+  // late var garage;
+  DateTime datetime = DateTime.now();
+  Txn txn = Txn();
+  late TxnType txnType = TxnType();
+
+  @override
+  void initState() {
+    car = Provider.of<GarageModel>(context, listen: false).cars[carIndex];
+    // garage = Provider.of<GarageModel>(context, listen: false);
+    super.initState();
+  }
+
+  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) {
+    // txnType = TxnType();
+    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,
+              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',
+                ),
+                initialValue: "0",
+                onSaved: (val) =>
+                    setState(() => txn.cost = double.parse(val ?? "0")),
+                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.txntype = txnType.selectedText;
+                        print(
+                            "txntype set to ${txn.txntype} from radio ${txnType.selectedText}");
+                        txn.carid = car.id;
+                        car.mileage = txn.mileage; // update car mileage too
+                      });
+                      print(txn.toMap());
+                      Provider.of<GarageModel>(context, listen: false)
+                          .update(car, carIndex);
+                      Provider.of<GarageModel>(context, listen: false)
+                          .insertTxn(txn);
+                      form.reset();
+                      Navigator.pop(context);
+                    }
+                  },
+                  child: Row(
+                    children: const <Widget>[
+                      //expand these children, too tight
+                      Icon(Icons.save),
+                      Text('Save Changes'),
+                    ],
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}