write printer connection status into attribute

lib/src/models/printer_status.dart

+enum ConnectionStatus {
+  waiting,
+  disconnected,
+  connected,
+}
+
+enum Level {
+  empty,
+  low,
+  mid,
+  full,
+}
+
 class PrinterStatus {
   int scan;
   int copy;
@@ -8,7 +21,8 @@ class PrinterStatus {
   int tray1;
   int tray2;
   int tray3;
-  int total;
+
+  ConnectionStatus connection;
 
   PrinterStatus({
     this.scan,
@@ -20,6 +34,7 @@ class PrinterStatus {
     this.tray1,
     this.tray2,
     this.tray3,
+    this.connection = ConnectionStatus.waiting,
   });
 
   factory PrinterStatus.fromMap(Map<String, dynamic> map) => PrinterStatus(
@@ -78,6 +93,8 @@ class PrinterStatus {
     return problems;
   }
 
+  Level get paperLevel => _percentageToLevel(((totalPaper / 3000) * 100).toInt());
+
   List<String> get scanStatus {
     var problems = <String>[];
 
@@ -128,6 +145,28 @@ class PrinterStatus {
         'tray_3': tray3,
       };
 
+  Level get tonerLevel {
+    if (tonerK == null) {
+      return null;
+    }
+    if (tonerC == null && tonerM == null && tonerY == null && tonerK != null) {
+      return _percentageToLevel(tonerK);
+    }
+
+    final toners = [tonerC, tonerM, tonerM, tonerK]..sort((a, b) => a.compareTo(b));
+
+    return _percentageToLevel(toners.first);
+  }
+
+  int get totalPaper => (tray1 ?? 0) + (tray2 ?? 0) + (tray3 ?? 0);
+
   @override
   String toString() => '[PrinterStatus $toMap]';
+
+  Level _percentageToLevel(int percentage) {
+    if (percentage >= 90) return Level.full;
+    if (percentage >= 20) return Level.mid;
+    if (percentage > 0) return Level.low;
+    return Level.empty;
+  }
 }

lib/src/printers/printers_bloc.dart

@@ -8,6 +8,7 @@ import 'package:logging/logging.dart';
 import '../models/enums.dart';
 import '../models/printer.dart';
 import '../models/printer_details.dart';
+import '../models/printer_status.dart';
 import '../models/printer_watch_options.dart';
 import '../network_exception.dart';
 import '../util.dart';
@@ -328,39 +329,52 @@ class PrintersBloc extends Bloc<PrintersEvent, PrintersState> {
         _log.finer(response.body);
         if (response.statusCode == 200) {
           var index = _printers.indexWhere((Printer printer) => printer.deviceId == deviceId);
+          final printer = Printer.fromMap(json.decode(response.body) as Map<String, dynamic>);
 
-          _printers[index] = Printer.fromMap(json.decode(response.body) as Map<String, dynamic>);
-
-          if (_printers[index].status != null) {
-            if (_printers[index].status.tonerC > 100 || _printers[index].status.tonerC < 0) {
-              _printers[index].status.tonerC = null;
+          if (printer.status != null) {
+            if (printer.status.tonerC > 100 || printer.status.tonerC < 0) {
+              printer.status.tonerC = null;
             }
-            if (_printers[index].status.tonerM > 100 || _printers[index].status.tonerM < 0) {
-              _printers[index].status.tonerM = null;
+            if (printer.status.tonerM > 100 || printer.status.tonerM < 0) {
+              printer.status.tonerM = null;
             }
-            if (_printers[index].status.tonerY > 100 || _printers[index].status.tonerY < 0) {
-              _printers[index].status.tonerY = null;
+            if (printer.status.tonerY > 100 || printer.status.tonerY < 0) {
+              printer.status.tonerY = null;
             }
-            if (_printers[index].status.tonerK > 100 || _printers[index].status.tonerK < 0) {
-              _printers[index].status.tonerK = null;
+            if (printer.status.tonerK > 100 || printer.status.tonerK < 0) {
+              printer.status.tonerK = null;
             }
-            if (_printers[index].status.tray1 < 0) {
-              _printers[index].status.tray1 = null;
+            if (printer.status.tray1 < 0) {
+              printer.status.tray1 = null;
             }
-            if (_printers[index].status.tray2 < 0) {
-              _printers[index].status.tray2 = null;
+            if (printer.status.tray2 < 0) {
+              printer.status.tray2 = null;
             }
-            if (_printers[index].status.tray3 < 0) {
-              _printers[index].status.tray3 = null;
+            if (printer.status.tray3 < 0) {
+              printer.status.tray3 = null;
             }
           }
 
-          return _printers[index];
+          if (printer.status == null) {
+            printer.status = PrinterStatus(connection: ConnectionStatus.disconnected);
+          } else {
+            printer.status.connection = ConnectionStatus.connected;
+          }
+
+          _printers[index] = printer;
+          return printer;
         } else {
           throw NetworkException('status code other than 200 received', response.statusCode);
         }
       },
-    ).timeout(const Duration(seconds: 10));
+    ).timeout(
+      const Duration(seconds: 10),
+      onTimeout: () {
+        var index = _printers.indexWhere((Printer printer) => printer.deviceId == deviceId);
+        _printers[index].status = PrinterStatus(connection: ConnectionStatus.disconnected);
+        return _printers[index];
+      },
+    );
   }
 
   Future<void> _getPrinters() async {