Begin implementing GPS related functions, and initial UI for trip and delivery

lib/data.dart

@@ -0,0 +1,121 @@
+import 'package:geolocator/geolocator.dart';
+import 'package:libac_dart/utils/TimeUtils.dart';
+import 'package:timetrack/consts.dart';
+
+class SessionData {
+  static int StartTime = 0;
+
+  static get StartTimeAsDateTime =>
+      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+
+  static bool IsOnTheClock = false;
+
+  static List<Trip> Trips = [];
+
+  static Delivery? currentDelivery;
+  static Trip? currentTrip;
+  List<Position> positions = [];
+
+  static Future<void> Login() async {
+    StartTime = TimeUtils.getUnixTimestamp();
+    IsOnTheClock = true;
+
+    bool hasGPS;
+
+    LocationPermission perm;
+    hasGPS = await Geolocator.isLocationServiceEnabled();
+    if (!hasGPS) {
+      IsOnTheClock = false;
+      return Future.error("Location services are disabled");
+    }
+
+    perm = await Geolocator.checkPermission();
+    if (perm == LocationPermission.denied) {
+      perm = await Geolocator.requestPermission();
+      if (perm == LocationPermission.denied) {
+        IsOnTheClock = false;
+        return Future.error("Location permissions are denied");
+      }
+    }
+
+    if (perm == LocationPermission.deniedForever) {
+      IsOnTheClock = false;
+      return Future.error(
+        "Location permissions are denied permanently. Login cannot proceed.",
+      );
+    }
+  }
+
+  static Future<void> Logout() async {
+    IsOnTheClock = false;
+
+    // TODO: Do other tasks to finalize the saved work data.
+  }
+
+  static Future<Position> GetNewLocation() async {
+    Position pos = await Geolocator.getCurrentPosition(
+      locationSettings: TTConsts.LOCATION_SETTINGS,
+    );
+
+    return pos;
+  }
+
+  static Trip GetNewTrip({required double basePay}) {
+    currentTrip = Trip(BasePay: basePay);
+    return currentTrip!;
+  }
+
+  static Delivery GetNewDelivery() {
+    if (currentTrip != null) {
+      var dropOff = currentTrip!.startNewDelivery();
+      ;
+      currentDelivery = dropOff;
+      return dropOff;
+    } else {
+      throw Exception("A delivery cannot exist without a trip");
+    }
+  }
+
+  static void EndTrip() {
+    currentDelivery = null;
+    currentTrip = null;
+  }
+}
+
+class Delivery {
+  double TipAmount = 0;
+  late Position endLocation;
+  int StartTime = 0;
+  DateTime get StartTimeAsDateTime =>
+      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+
+  Delivery() {
+    StartTime = TimeUtils.getUnixTimestamp();
+  }
+
+  Future<void> MarkEndLocation() async {
+    var pos = await SessionData.GetNewLocation();
+    endLocation = pos;
+  }
+}
+
+class Trip {
+  List<Delivery> deliveries = [];
+
+  int StartTime = 0;
+  DateTime get StartTimeAsDateTime =>
+      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+
+  double BasePay = 0.0;
+
+  Trip({required this.BasePay}) {
+    StartTime = TimeUtils.getUnixTimestamp();
+  }
+
+  Delivery startNewDelivery() {
+    var delivery = Delivery();
+    deliveries.add(delivery);
+
+    return delivery;
+  }
+}