Fix some runtime errors

lib/assets/app_theme.dart

@@ -65,7 +65,8 @@ class AppTheme {
       enabledBorder: OutlineInputBorder(
         borderSide: BorderSide(color: _darkPrimaryVariantColor),
       ),
-    ), colorScheme: ColorScheme.light(
+    ),
+    colorScheme: ColorScheme.dark(
       primary: _darkPrimaryColor,
       secondary: _iconColor,
       background: _darkBackgroundColor,

lib/helpers/database_actions.dart

@@ -686,7 +686,7 @@ class DatabaseActions {
   }
 
   static Future<bool> addTracked(
-      String code, String exchange, String name, bool pinned) async {
+      String code, String exchange, String? name, bool pinned) async {
     return await Db().insert(Db.tblTracked, {
       Db.colCode: code,
       Db.colExch: exchange,

lib/models/database/portfolio.dart

@@ -1,12 +1,12 @@
 import 'package:folio/services/database/database.dart';
 
 class Portfolio {
-  late int rowid;
-  late String bseCode;
-  late String nseCode;
-  late int qty;
-  late double msr;
-  late double esr;
+  late int? rowid;
+  late String? bseCode;
+  late String? nseCode;
+  late int? qty;
+  late double? msr;
+  late double? esr;
 
   Portfolio.fromDbTuple(Map<String, dynamic> tuple) {
     rowid = tuple["rowid"];

lib/models/stock/latest.dart

@@ -1,9 +1,9 @@
 class Latest {
-  double value = 0.0;
-  String change = "";
-  String percentageChange = "";
+  double? value;
+  String? change;
+  String? percentageChange;
   int sign = 0;
-  String updated = "";
+  String? updated;
 
   Latest();
 
@@ -13,14 +13,14 @@ class Latest {
   @override
   String toString() {
     return 'value: ' +
-        value.toStringAsFixed(2) +
+        (value?.toStringAsFixed(2) ?? "NULL") +
         '\nchange: ' +
-        change +
+        (change ?? "NULL") +
         '\npercentageChange: ' +
-        percentageChange +
+        (percentageChange ?? "NULL") +
         '\nsign: ' +
         sign.toString() +
         '\ntime: ' +
-        updated;
+        (updated ?? "NULL");
   }
 }

lib/models/stock/stock.dart

@@ -15,13 +15,13 @@ class Stock {
         _tracked = Tracked.fromDbTuple(tuple),
         _latest = Latest();
 
-  int get id => _portfolio.rowid;
+  int? get id => _portfolio.rowid;
 
-  String? get name => _tracked?.name;
+  String? get name => _tracked.name;
 
-  String? get exchange => _tracked?.exchange;
+  String get exchange => _tracked.exchange;
 
-  String? get code => _tracked?.code;
+  String get code => _tracked.code;
 
   int? get qty => _portfolio?.qty;
 
@@ -53,9 +53,9 @@ class Stock {
 
   bool get pinned => _tracked.pinned;
 
-  String get bseCode => _portfolio.bseCode;
+  String? get bseCode => _portfolio.bseCode;
 
-  String get nseCode => _portfolio.nseCode;
+  String? get nseCode => _portfolio.nseCode;
 
   set pinned(bool pin) {
     _tracked.pinned = pin;
@@ -65,28 +65,30 @@ class Stock {
     _tracked.name = name;
   }
 
-  set bseCode(String code) {
+  set bseCode(String? code) {
+    if (code == null) return;
     _portfolio.bseCode = code;
 
     if (_tracked.exchange == "BSE") {
       _tracked.code = code;
     }
   }
 
-  set nseCode(String code) {
+  set nseCode(String? code) {
+    if (code == null) return;
     _portfolio.nseCode = code;
 
     if (_tracked.exchange == "NSE") {
       _tracked.code = code;
     }
   }
 
-  set latest(Latest data) {
-    _latest.change = data?.change ?? _latest.change;
-    _latest.percentageChange =
-        data?.percentageChange ?? _latest.percentageChange;
-    _latest.sign = data?.sign ?? 0;
-    _latest.updated = data!.updated;
-    _latest.value = data!.value;
+  set latest(Latest? data) {
+    if (data == null) return;
+    _latest.change = data.change;
+    _latest.percentageChange = data.percentageChange;
+    _latest.sign = data.sign;
+    _latest.updated = data.updated;
+    _latest.value = data.value;
   }
 }

lib/services/query/query_api.dart

@@ -36,7 +36,7 @@ class QueryAPI {
         },
       );
 
-      if (r.statusCode == 200) {
+      if (r.statusCode == 200 && r.data != null) {
         var data = jsonDecode(r.data!.substring(4))['PriceUpdate']['entities']
             .first['financial_entity']['common_entity_data'];
 
@@ -94,7 +94,7 @@ class QueryAPI {
         },
       );
 
-      if (r.statusCode == 200) {
+      if (r.statusCode == 200 && r.data != null) {
         var ret = jsonDecode(r.data!.substring(4))['PriceUpdate']['entities']
             .first['financial_entity']['common_entity_data']['name']
             .toString();

lib/services/query/query_bse_api.dart

@@ -25,7 +25,7 @@ class QueryBSEAPI {
           "seriesid": "",
         },
       );
-      if (r.statusCode == 200) {
+      if (r.statusCode == 200 && r.data != null) {
         var data = jsonDecode(r.data!);
         double currVal = double.parse(data['CurrVal']);
         double prevClose = double.parse(data['PrevClose']);
@@ -70,7 +70,7 @@ class QueryBSEAPI {
           "seriesid": "",
         },
       );
-      if (r.statusCode == 200) {
+      if (r.statusCode == 200 && r.data != null) {
         return jsonDecode(r.data!)['Cmpname']['FullN'].toString();
       } else {
         log("query_bse_api.getName($code) => \n " +

lib/services/query/query_nse_api.dart

@@ -68,7 +68,8 @@ class NetworkService {
       throw new Exception("Error while fetching data: " +
           statusCode.toString() +
           "\n\n" +
-          response.request!.headers.toString());
+          (response.request?.headers?.toString() ??
+              "<<< Headers  are NULL >>>"));
     }
     return res;
   }
@@ -99,7 +100,9 @@ class QueryNSEAPI {
     try {
       await session.get(uri, headers);
     } catch (e) {
-      dev.log("query_nse_api.getCurrentData($code) => \nNSE: Error getting cookies : " + e.toString());
+      dev.log(
+          "query_nse_api.getCurrentData($code) => \nNSE: Error getting cookies : " +
+              e.toString());
     }
 
     uri = Uri.https(
@@ -151,7 +154,9 @@ class QueryNSEAPI {
     try {
       await session.get(uri, headers);
     } catch (e) {
-      dev.log("query_nse_api.getCurrentData($code) => \nNSE: Error getting cookies : " + e.toString());
+      dev.log(
+          "query_nse_api.getCurrentData($code) => \nNSE: Error getting cookies : " +
+              e.toString());
     }
 
     uri = Uri.https(

lib/views/portfolio/portfolio_tile.dart

@@ -32,14 +32,14 @@ class PortfolioTile extends StatelessWidget {
                 alignment: WrapAlignment.center,
                 runAlignment: WrapAlignment.center,
                 children: [
-                  _portfolio?.bseCode != null
+                  _portfolio.bseCode != null
                       ? Padding(
                           padding: const EdgeInsets.symmetric(horizontal: 10.0),
                           child: Row(
                             mainAxisSize: MainAxisSize.min,
                             children: [
                               Text(
-                                "BSE - " + (_portfolio?.bseCode)!,
+                                "BSE - " + _portfolio.bseCode!,
                                 style: Theme.of(context).textTheme.bodyLarge,
                               ),
                               SizedBox(
@@ -58,7 +58,7 @@ class PortfolioTile extends StatelessWidget {
                                   await showDialog(
                                     context: context,
                                     builder: (context) => EditCodeDialog(
-                                        _portfolio!.bseCode!,
+                                        _portfolio.bseCode!,
                                         "BSE",
                                         updateBSECode),
                                   );
@@ -70,14 +70,14 @@ class PortfolioTile extends StatelessWidget {
                       : Container(
                           width: 0,
                         ),
-                  _portfolio?.nseCode != null
+                  _portfolio.nseCode != null
                       ? Padding(
                           padding: const EdgeInsets.symmetric(horizontal: 5.0),
                           child: Row(
                             mainAxisSize: MainAxisSize.min,
                             children: [
                               Text(
-                                "NSE - " + _portfolio!.nseCode,
+                                "NSE - " + _portfolio.nseCode!,
                                 style: Theme.of(context).textTheme.bodyLarge,
                               ),
                               SizedBox(
@@ -96,7 +96,7 @@ class PortfolioTile extends StatelessWidget {
                                   showDialog(
                                     context: context,
                                     builder: (context) => EditCodeDialog(
-                                        _portfolio!.nseCode!,
+                                        _portfolio.nseCode!,
                                         "NSE",
                                         updateNSECode),
                                   );
@@ -118,7 +118,7 @@ class PortfolioTile extends StatelessWidget {
                 Expanded(
                   flex: 2,
                   child: Text(
-                    _portfolio?.qty?.toString() ?? "N/A",
+                    _portfolio.qty?.toString() ?? "—",
                     textAlign: TextAlign.center,
                     style: Theme.of(context)
                         .textTheme
@@ -129,7 +129,7 @@ class PortfolioTile extends StatelessWidget {
                 Expanded(
                   flex: 3,
                   child: Text(
-                    _portfolio?.msr?.toStringAsFixed(2) ?? "N/A",
+                    _portfolio.msr?.toStringAsFixed(2) ?? "—",
                     textAlign: TextAlign.center,
                     style: Theme.of(context)
                         .textTheme
@@ -140,7 +140,7 @@ class PortfolioTile extends StatelessWidget {
                 Expanded(
                   flex: 3,
                   child: Text(
-                    _portfolio?.esr?.toStringAsFixed(2) ?? "N/A",
+                    _portfolio?.esr?.toStringAsFixed(2) ?? "—",
                     textAlign: TextAlign.center,
                     style: Theme.of(context)
                         .textTheme

lib/views/settings/data/add_portfolio_dialog.dart

@@ -61,7 +61,7 @@ class _AddPortfolioDialogState extends State<AddPortfolioDialog> {
                   keyboardType: TextInputType.text,
                   controller: _nseCodeCtl,
                   validator: (value) {
-                    if (value!.isEmpty) {
+                    if (value == null || value.isEmpty) {
                       return 'Required';
                     }
                     return null;
@@ -83,7 +83,7 @@ class _AddPortfolioDialogState extends State<AddPortfolioDialog> {
                   keyboardType: TextInputType.text,
                   controller: _bseCodeCtl,
                   validator: (value) {
-                    if (value!.isEmpty) {
+                    if (value == null || value.isEmpty) {
                       return 'Required';
                     }
                     return null;
@@ -117,7 +117,7 @@ class _AddPortfolioDialogState extends State<AddPortfolioDialog> {
                           )),
                       child: Text("Add"),
                       onPressed: () {
-                        if (_formKey.currentState!.validate()) {
+                        if (_formKey.currentState != null && _formKey.currentState!.validate()) {
                           DatabaseActions.linkCodes({
                             'NSE': _nseCodeCtl.text,
                             'BSE': _bseCodeCtl.text,