Begin adding the work data visualizer

lib/data.dart

@@ -1,15 +1,14 @@
 import 'dart:async';
 import 'dart:convert';
+import 'dart:math' as math;
+import 'dart:ui';
 
 import 'package:geolocator/geolocator.dart';
-import 'package:libac_dart/utils/TimeUtils.dart';
+import 'package:libac_dart/nbt/Stream.dart';
 import 'package:timetrack/consts.dart';
 
 class SessionData {
-  static int StartTime = 0;
-
-  static get StartTimeAsDateTime =>
-      DateTime.fromMillisecondsSinceEpoch(StartTime * 1000);
+  static DateTime StartTime = DateTime(0);
 
   static bool IsOnTheClock = false;
 
@@ -19,12 +18,121 @@ class SessionData {
   static Trip? currentTrip;
   static List<Position> positions = [];
   static late StreamSubscription<Position> _listener;
+  static Callbacks Calls = Callbacks();
 
   /// 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 double GetTotalBasePay() {
+    double total = 0;
+    for (var trip in Trips) {
+      total += trip.BasePay;
+    }
+
+    return total;
+  }
+
+  static double GetTotalTips() {
+    double total = 0;
+    for (var trip in Trips) {
+      for (var drop in trip.deliveries) {
+        total += drop.TipAmount;
+      }
+    }
+
+    return total;
+  }
+
+  static double GetTotalPay() {
+    return GetTotalBasePay() + GetTotalTips();
+  }
+
+  static double GetTotalMiles() {
+    double total = 0;
+    total = _totalMilesTraveled(
+      positions,
+      minDistanceMeters: 5,
+      maxDistanceMeters: 512,
+    );
+    return total;
+  }
+
+  static String GetTotalMilesAsString() {
+    double miles = GetTotalMiles();
+    if (miles == 0) return "0.0";
+    List<String> split = miles.toString().split(".");
+    StringBuilder out = StringBuilder();
+
+    out.append(split[0]);
+    out.append(".");
+    out.append(split[1].substring(0, 4));
+
+    return out.toString();
+  }
+
+  //** Begin AI Generated code */
+  /// Converts meters → miles.
+  static const _metersPerMile = 1609.344;
+
+  /// Radius of the earth in meters (WGS‑84 mean radius).
+  static const _earthRadiusM = 6371000.0;
+  static double _haversineMeters(
+    double lat1,
+    double lon1,
+    double lat2,
+    double lon2,
+  ) {
+    final dLat = _deg2rad(lat2 - lat1);
+    final dLon = _deg2rad(lon2 - lon1);
+
+    final a =
+        math.sin(dLat / 2) * math.sin(dLat / 2) +
+        math.cos(_deg2rad(lat1)) *
+            math.cos(_deg2rad(lat2)) *
+            math.sin(dLon / 2) *
+            math.sin(dLon / 2);
+
+    return _earthRadiusM * 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a));
+  }
+
+  static double _deg2rad(double deg) => deg * math.pi / 180.0;
+
+  /// Returns total miles traveled after basic GPS‑noise cleanup.
+  ///
+  /// * [minDistanceMeters] – drop segments shorter than this (jitter).
+  /// * [maxDistanceMeters] – drop segments longer than this (impossible jump).
+  static double _totalMilesTraveled(
+    List<Position> positions, {
+    double minDistanceMeters = 5,
+    double? maxDistanceMeters,
+  }) {
+    if (positions.length < 2) return 0;
+
+    var meters = 0.0;
+
+    for (var i = 1; i < positions.length; i++) {
+      final p1 = positions[i - 1];
+      final p2 = positions[i];
+
+      final d = _haversineMeters(
+        p1.latitude,
+        p1.longitude,
+        p2.latitude,
+        p2.longitude,
+      );
+
+      if (d < minDistanceMeters) continue; // too small → jitter
+      if (maxDistanceMeters != null && d > maxDistanceMeters)
+        continue; // glitch
+
+      meters += d;
+    }
+    return meters / _metersPerMile;
+  }
+  //** End AI Generated code */
+
   static Future<void> Login() async {
-    StartTime = TimeUtils.getUnixTimestamp();
+    StartTime = DateTime.now();
     IsOnTheClock = true;
 
     bool hasGPS;
@@ -60,6 +168,8 @@ class SessionData {
         return;
       }
       positions.add(pos);
+
+      SessionData.Calls.dispatch();
     });
   }
 
@@ -226,3 +336,17 @@ class Trip {
     return trip;
   }
 }
+
+class Callbacks {
+  VoidCallback? HomeCallback;
+  VoidCallback? MapCallback;
+  VoidCallback? UpdateSettingsCallback;
+  VoidCallback? WorkDataCallback;
+
+  void dispatch() {
+    if (HomeCallback != null) HomeCallback!();
+    if (MapCallback != null) MapCallback!();
+    if (UpdateSettingsCallback != null) UpdateSettingsCallback!();
+    if (WorkDataCallback != null) WorkDataCallback!();
+  }
+}