Add position logging, and ability to end the work day

lib/data.dart

@@ -1,3 +1,6 @@
+import 'dart:async';
+import 'dart:convert';
+
 import 'package:geolocator/geolocator.dart';
 import 'package:libac_dart/utils/TimeUtils.dart';
 import 'package:timetrack/consts.dart';
@@ -14,7 +17,11 @@ class SessionData {
 
   static Delivery? currentDelivery;
   static Trip? currentTrip;
-  List<Position> positions = [];
+  static List<Position> positions = [];
+  static late StreamSubscription<Position> _listener;
+
+  /// This flag is usually set when data is loaded from a saved state. Or when accessed using the Web version of the app.
+  static bool IsReadOnly = false;
 
   static Future<void> Login() async {
     StartTime = TimeUtils.getUnixTimestamp();
@@ -44,12 +51,68 @@ class SessionData {
         "Location permissions are denied permanently. Login cannot proceed.",
       );
     }
+
+    _listener = Geolocator.getPositionStream(
+      locationSettings: TTConsts.LOCATION_SETTINGS,
+    ).listen((pos) {
+      if (!IsOnTheClock) {
+        _listener.cancel();
+        return;
+      }
+      positions.add(pos);
+    });
   }
 
   static Future<void> Logout() async {
     IsOnTheClock = false;
+    currentDelivery = null;
+    currentTrip = null;
+    _listener.cancel();
 
-    // TODO: Do other tasks to finalize the saved work data.
+    var saveData = SaveData();
+    print(saveData);
+
+    Trips = [];
+    positions = [];
+
+    // TODO: Upload to the server.
+  }
+
+  static String SaveData() {
+    Map<String, dynamic> saveData = {};
+
+    List<Map<String, dynamic>> _trips = [];
+    for (var trip in Trips) {
+      _trips.add(trip.toJsonMap());
+    }
+
+    List<Map<String, dynamic>> _pos = [];
+    for (var pos in positions) {
+      _pos.add(pos.toJson());
+    }
+
+    saveData["trips"] = _trips;
+    saveData["positions"] = _pos;
+
+    return json.encode(saveData);
+  }
+
+  void LoadData(String js) {
+    Map<String, dynamic> _js = json.decode(js);
+    List<Map<String, dynamic>> _trips =
+        _js['trips'] as List<Map<String, dynamic>>;
+    List<Map<String, dynamic>> _pos =
+        _js['positions'] as List<Map<String, dynamic>>;
+
+    for (var trip in _trips) {
+      Trips.add(Trip.fromJsonMap(trip));
+    }
+
+    for (var position in _pos) {
+      positions.add(Position.fromMap(position));
+    }
+
+    IsReadOnly = true;
   }
 
   static Future<Position> GetNewLocation() async {
@@ -84,32 +147,48 @@ class SessionData {
 
 class Delivery {
   double TipAmount = 0;
-  late Position endLocation;
-  int StartTime = 0;
-  DateTime get StartTimeAsDateTime =>
-      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+  Position? endLocation;
+  DateTime StartTime = DateTime.now();
 
   Delivery() {
-    StartTime = TimeUtils.getUnixTimestamp();
+    StartTime = DateTime.now();
   }
 
   Future<void> MarkEndLocation() async {
     var pos = await SessionData.GetNewLocation();
     endLocation = pos;
   }
+
+  Map<String, dynamic> toJsonMap() {
+    return {
+      "tip": TipAmount,
+      "start": StartTime.toString(),
+      "endPos": endLocation?.toJson() ?? "incomplete",
+    };
+  }
+
+  static Delivery fromMap(Map<String, dynamic> jsx) {
+    Delivery delivery = Delivery();
+    delivery.StartTime = DateTime.parse(jsx['start'] as String);
+    delivery.TipAmount = jsx['tip'] as double;
+    if (jsx['endPos'] as String == "incomplete")
+      delivery.endLocation = null;
+    else
+      delivery.endLocation = Position.fromMap(jsx['endPos']);
+
+    return delivery;
+  }
 }
 
 class Trip {
   List<Delivery> deliveries = [];
 
-  int StartTime = 0;
-  DateTime get StartTimeAsDateTime =>
-      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+  DateTime StartTime = DateTime(0);
 
   double BasePay = 0.0;
 
   Trip({required this.BasePay}) {
-    StartTime = TimeUtils.getUnixTimestamp();
+    StartTime = DateTime.now();
   }
 
   Delivery startNewDelivery() {
@@ -118,4 +197,31 @@ class Trip {
 
     return delivery;
   }
+
+  Map<String, dynamic> toJsonMap() {
+    Map<String, Object> _trip = {"start": StartTime.toString(), "pay": BasePay};
+    List<Map<String, dynamic>> _dropOffs = [];
+    for (var delivery in deliveries) {
+      _dropOffs.add(delivery.toJsonMap());
+    }
+
+    _trip["deliveries"] = _dropOffs;
+
+    return _trip;
+  }
+
+  static Trip fromJsonMap(Map<String, dynamic> jsx) {
+    Trip trip = Trip(BasePay: 0);
+    trip.BasePay = jsx['pay'] as double;
+    trip.StartTime = DateTime.parse(jsx['start'] as String);
+    trip.deliveries = [];
+    List<Map<String, dynamic>> _dropOffs =
+        jsx['deliveries'] as List<Map<String, dynamic>>;
+
+    for (var dropOff in _dropOffs) {
+      trip.deliveries.add(Delivery.fromMap(dropOff));
+    }
+
+    return trip;
+  }
 }