Add a Help page.

lib/main.dart

@@ -7,6 +7,7 @@ import '/pages/income.dart';
 import '/pages/asset.dart';
 import '/pages/report.dart';
 import '/pages/settings.dart';
+import '/pages/help.dart';
 import '/db.dart';
 
 void main() {
@@ -25,6 +26,12 @@ class MainApp extends StatelessWidget {
         useMaterial3: true,
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
       ),
+      darkTheme: ThemeData(
+        useMaterial3: true,
+        brightness: Brightness.dark,
+        colorSchemeSeed: Colors.green,
+      ),
+      themeMode: ThemeMode.system,
       home: HomePage(),
     );
   }
@@ -64,13 +71,17 @@ class _HomePageState extends State<HomePage> {
         page = ProjectionPage();
       case 4:
         page = SettingsPage();
+      case 5:
+        page = HelpPage();
       default:
         throw UnimplementedError('No widget for page $pageSelected yet!');
     }
 
     Future<void> addNewValue(BuildContext context) {
       return showDialog(
-          context: context, builder: (_) => AlertDialog(content: dialog));
+        context: context,
+        builder: (_) => AlertDialog(content: dialog),
+      );
     }
 
     Widget? floatingButton;
@@ -88,7 +99,7 @@ class _HomePageState extends State<HomePage> {
       return Scaffold(
         appBar: AppBar(title: Text("Expense Tracker")),
         drawer: NavigationRail(
-          extended: constraints.maxWidth >= 800,
+          extended: true,
           destinations: [
             NavigationRailDestination(
               icon: Icon(Icons.payment),
@@ -110,6 +121,10 @@ class _HomePageState extends State<HomePage> {
               icon: Icon(Icons.settings),
               label: Text('Settings'),
             ),
+            NavigationRailDestination(
+              icon: Icon(Icons.help),
+              label: Text('Help'),
+            ),
           ],
           selectedIndex: pageSelected,
           onDestinationSelected: (value) {

lib/models/expense.dart

@@ -12,7 +12,16 @@ class Expense {
       required this.frequency,
       required this.description});
 
+  @override
   String toString() {
     return "$name, $cost, ${frequency.title}, $description";
   }
+
+  double calcComparableCost() {
+    return cost * frequency.timesPerYear;
+  }
+
+  double calcComparableCostDaily() {
+    return cost / frequency.numDays;
+  }
 }

lib/models/frequency.dart

@@ -1,12 +1,63 @@
 // https://www.tutorialspoint.com/dart_programming/dart_programming_enumeration.htm
 enum Frequency {
-  daily(title: "Daily"),
-  weekly(title: "Weekly"),
-  biweekly(title: "Biweekly"),
-  montly(title: "Monthly"),
-  yearly(title: "Yearly");
+  daily(
+    title: "Daily",
+    hint: "Once Per Day",
+    timesPerYear: 364.25,
+    numDays: 1,
+  ),
+  weekly(
+    title: "Weekly",
+    hint: "Once Per Week",
+    timesPerYear: (364.25 / 7),
+    numDays: 7,
+  ),
+  biweekly(
+    title: "Biweekly",
+    hint: "Every Other Week",
+    timesPerYear: (364.25 / 14),
+    numDays: 14,
+  ),
+  bimonthly(
+    title: "Bimonthly",
+    hint: "Twice Per Month",
+    timesPerYear: 24,
+    numDays: (364.25 / 24),
+  ),
+  monthly(
+    title: "Monthly",
+    hint: "Once Per Month",
+    timesPerYear: 12,
+    numDays: (364.25 / 12),
+  ),
+  quarterly(
+    title: "Quarterly",
+    hint: "Every Three Months",
+    timesPerYear: 4,
+    numDays: (364.25 / 4),
+  ),
+  biannual(
+    title: "Biannual",
+    hint: "Twice Per Year",
+    timesPerYear: 2,
+    numDays: (364.25 / 2),
+  ),
+  yearly(
+    title: "Yearly",
+    hint: "Once Per Year",
+    timesPerYear: 1,
+    numDays: 364.25,
+  );
 
-  const Frequency({required this.title});
+  const Frequency({
+    required this.title,
+    required this.hint,
+    required this.timesPerYear,
+    required this.numDays,
+  });
 
   final String title;
+  final String hint;
+  final double timesPerYear;
+  final double numDays;
 }

lib/pages/expense.dart

@@ -7,33 +7,152 @@ import '/models/frequency.dart';
 
 List<Expense> expenses = [];
 
-class ExpensePage extends StatelessWidget {
+class ExpensePage extends StatefulWidget {
   const ExpensePage({
     super.key,
   });
 
+  @override
+  State<ExpensePage> createState() => _ExpensePageState();
+}
+
+class _ExpensePageState extends State<ExpensePage> {
+  refresh() {
+    setState(() {});
+  }
+
   @override
   Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    expenses.sort(
+      (a, b) => (b.calcComparableCost() - a.calcComparableCost()).toInt(),
+    );
+
     return expenses.isEmpty
         ? Text("Add expenses to get started!")
         : ListView.builder(
             itemCount: expenses.length,
             itemBuilder: (_, index) {
               final Expense curr = expenses[index];
-              return Center(
-                child: Padding(
+              final String estimateSymbolYearly = curr.frequency.timesPerYear
+                          .toStringAsFixed(2)
+                          .endsWith(".00") &&
+                      curr.calcComparableCost().toStringAsFixed(3).endsWith("0")
+                  ? ""
+                  : "~";
+              final String estimateSymbolDaily =
+                  curr.frequency.numDays.toStringAsFixed(2).endsWith(".00") &&
+                          curr
+                              .calcComparableCostDaily()
+                              .toStringAsFixed(3)
+                              .endsWith("0")
+                      ? ""
+                      : "~";
+              return Padding(
                 padding: const EdgeInsets.all(4.0),
+                child: Dismissible(
+                  key: Key(curr.toString()),
+                  background: Container(
+                    color: Colors.red,
+                    child: Row(
+                      mainAxisAlignment: MainAxisAlignment.start,
+                      children: [
+                        Icon(Icons.delete),
+                        Text("Delete"),
+                      ],
+                    ),
+                  ),
+                  secondaryBackground: Container(
+                    color: Colors.orange,
+                    child: Row(
+                      mainAxisAlignment: MainAxisAlignment.end,
+                      children: [
+                        Text("Edit"),
+                        Icon(Icons.edit),
+                      ],
+                    ),
+                  ),
+                  onDismissed: (direction) {
+                    setState(() {
+                      expenses.remove(curr);
+                    });
+                    switch (direction) {
+                      case DismissDirection.startToEnd:
+                        // Only remove the item from the list.
+                        break;
+                      case DismissDirection.endToStart:
+                        // Open an edit dialog, then remove the item from the list.
+                        showDialog(
+                          context: context,
+                          builder: (_) => AlertDialog(
+                            content: ExpenseInputDialog(
+                              notifyParent: refresh,
+                              expense: curr,
+                            ),
+                          ),
+                        );
+                        break;
+                      default:
+                        UnimplementedError(
+                          "Direction ${direction.toString()} not recognized.",
+                        );
+                    }
+                  },
                   child: Container(
                     decoration: BoxDecoration(
                       borderRadius: BorderRadius.circular(4),
-                      color: Colors.greenAccent,
+                      color: theme.colorScheme.onPrimary,
                     ),
-                    child: Column(
+                    child: Padding(
+                      padding: const EdgeInsets.all(4.0),
+                      child: Row(
+                        mainAxisSize: MainAxisSize.max,
                         children: [
-                        Text(curr.name),
-                        Text("${curr.cost.toString()} ${curr.frequency.title}"),
+                          Column(
+                            mainAxisSize: MainAxisSize.min,
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Text(
+                                curr.name,
+                                style: TextStyle(fontSize: 20.0),
+                              ),
+                              Text(
+                                "${curr.cost.toStringAsFixed(2)} ${curr.frequency.title}",
+                                style: TextStyle(fontSize: 12.0),
+                              ),
                             ],
                           ),
+                          Expanded(
+                            child: Center(
+                              child: Text(
+                                curr.description,
+                                style: TextStyle(
+                                  fontSize: 12.0,
+                                ),
+                                softWrap: true,
+                                textAlign: TextAlign.center,
+                              ),
+                            ),
+                          ),
+                          Column(
+                            crossAxisAlignment: CrossAxisAlignment.end,
+                            children: [
+                              //if (curr.frequency != Frequency.daily)
+                              Text(
+                                "$estimateSymbolDaily${curr.calcComparableCostDaily().toStringAsFixed(2)} ${Frequency.daily.title}",
+                                style: TextStyle(fontSize: 12.0),
+                              ),
+                              //if (curr.frequency != Frequency.yearly)
+                              Text(
+                                "$estimateSymbolYearly${curr.calcComparableCost().toStringAsFixed(2)} ${Frequency.yearly.title}",
+                                style: TextStyle(fontSize: 12.0),
+                              ),
+                            ],
+                          ),
+                        ],
+                      ),
+                    ),
                   ),
                 ),
               );
@@ -44,9 +163,12 @@ class ExpensePage extends StatelessWidget {
 
 class ExpenseInputDialog extends StatefulWidget {
   final Function() notifyParent;
+  final Expense? expense;
+
   const ExpenseInputDialog({
     super.key,
     required this.notifyParent,
+    this.expense,
   });
 
   @override
@@ -57,62 +179,128 @@ class _ExpenseInputDialogState extends State<ExpenseInputDialog> {
   final _expenseFormKey = GlobalKey<FormState>();
 
   String _name = "";
-  double _cost = 0.0;
-  Frequency _freq = Frequency.montly;
+  double _cost = 0;
+  Frequency _freq = Frequency.monthly;
   String _desc = "";
 
   @override
   Widget build(BuildContext context) {
-    return AlertDialog(
+    if (widget.expense != null) {
+      _name = widget.expense!.name;
+      _cost = widget.expense!.cost;
+      _freq = widget.expense!.frequency;
+      _desc = widget.expense!.description;
+    }
+
+    return Column(
+      // prevent AlertDialog from taking full vertical height.
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Container(
+          alignment: FractionalOffset.topRight,
+          child: IconButton(
+            onPressed: () {
+              if (widget.expense != null) {
+                setState(() {
+                  expenses.add(widget.expense!);
+                  widget.notifyParent();
+                });
+              }
+              Navigator.of(context).pop();
+            },
+            icon: Icon(Icons.clear),
+          ),
+        ),
+        AlertDialog(
+          insetPadding: EdgeInsets.all(0),
           title: Center(
-        child: Text("New Expense"),
+            child: widget.expense == null
+                ? Text("New Expense")
+                : Text("Edit Expense"),
           ),
           content: Form(
             key: _expenseFormKey,
-        //autovalidateMode: AutovalidateMode.onUserInteraction,
             child: Column(
               mainAxisSize: MainAxisSize.min,
-          //spacing: 10,
               children: [
                 TextFormField(
                   keyboardType: TextInputType.text,
+                  textCapitalization: TextCapitalization.words,
                   decoration: InputDecoration(
                     labelText: "Name",
-                hintText: "Example: Red Pocket Phone Bill",
+                    hintText: "Example: Red Pocket",
+                    hintStyle: TextStyle(fontSize: 10.0),
+                    errorStyle: TextStyle(fontSize: 10.0),
                   ),
+                  initialValue: _name,
                   validator: (value) {
                     if (value!.isEmpty) {
                       return "Name must be provided.";
                     }
+                    if (!expenses.every((expense) => expense.name != value)) {
+                      return "Name must be unique, already in use.";
+                    }
                     return null;
                   },
-              onSaved: (newValue) {
-                _name = newValue!;
+                  onSaved: (value) {
+                    _name = value!;
                   },
                 ),
                 TextFormField(
                   keyboardType: TextInputType.numberWithOptions(decimal: true),
                   decoration: InputDecoration(
-                  labelText: "Cost", hintText: "Example: 10.00"),
+                    labelText: "Cost",
+                    hintText: "Example: 10.00",
+                    hintStyle: TextStyle(fontSize: 10.0),
+                    errorStyle: TextStyle(fontSize: 10.0),
+                  ),
+                  initialValue: _cost != 0 ? _cost.toString() : "",
                   validator: (value) {
-                if (value!.isEmpty) {
+                    if (value == null || value.isEmpty) {
                       return "Cost must be provided.";
                     }
+                    if (double.parse(value) < 0) {
+                      return "Please use the Income page rather than having negative expenses.";
+                    }
+                    if (double.parse(value) < 0.01) {
+                      return "Cost must be one hundreth (0.01) or higher.";
+                    }
                     if (double.tryParse(value) == null) {
                       return "Cost must be a valid number.";
                     }
                     return null;
                   },
-              onSaved: (newValue) {
-                _cost = double.parse(newValue!);
+                  onSaved: (value) {
+                    _cost = double.parse(value!);
                   },
                 ),
                 DropdownButtonFormField(
-              items: (Frequency.values.map((freq) =>
-                      DropdownMenuItem(value: freq, child: Text(freq.title))))
+                  items: Frequency.values
+                      .map(
+                        (freq) => DropdownMenuItem(
+                          value: freq,
+                          child: Row(
+                            children: [
+                              Text(
+                                freq.title,
+                              ),
+                              Padding(
+                                padding: EdgeInsets.all(1.0),
+                                child: Text(
+                                  " (${freq.hint})",
+                                  style: TextStyle(fontSize: 10.0),
+                                ),
+                              ),
+                            ],
+                          ),
+                        ),
+                      )
                       .toList(),
+                  value: _freq,
                   decoration: InputDecoration(
-                  labelText: "Recurrence", hintText: "Example: Monthly"),
+                    labelText: "Frequency",
+                    errorStyle: TextStyle(fontSize: 10.0),
+                  ),
                   validator: (value) {
                     if (value == null) {
                       return "Frequency must be provided.";
@@ -122,38 +310,33 @@ class _ExpenseInputDialogState extends State<ExpenseInputDialog> {
                     }
                     return null;
                   },
-              onChanged: (newValue) {
-                _freq = newValue!;
+                  onChanged: (value) {
+                    _freq = value!;
                   },
                 ),
                 TextFormField(
                   keyboardType: TextInputType.text,
+                  textCapitalization: TextCapitalization.sentences,
                   decoration: InputDecoration(
                     labelText: "Description",
-                  hintText: "Example: 1GB data with unlimited talk & text."),
+                    hintText: "Example: 1GB data with unlimited talk & text.",
+                    hintStyle: TextStyle(fontSize: 8.0),
+                    errorStyle: TextStyle(fontSize: 10.0),
+                  ),
+                  initialValue: _desc,
                   validator: (value) {
                     return null;
                   },
-              onSaved: (newValue) {
-                _desc = newValue!;
+                  onSaved: (value) {
+                    _desc = value!;
                   },
                 ),
               ],
             ),
           ),
           actions: [
-        Row(
-          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-          crossAxisAlignment: CrossAxisAlignment.center,
-          children: [
-            ElevatedButton.icon(
-              onPressed: () {
-                Navigator.of(context).pop();
-              },
-              icon: Icon(Icons.cancel),
-              label: Text('Cancel'),
-            ),
-            ElevatedButton.icon(
+            Center(
+              child: ElevatedButton.icon(
                 onPressed: () {
                   if (_expenseFormKey.currentState!.validate()) {
                     _expenseFormKey.currentState!.save();
@@ -173,9 +356,10 @@ class _ExpenseInputDialogState extends State<ExpenseInputDialog> {
                 icon: Icon(Icons.save),
                 label: Text('Submit'),
               ),
-          ],
             )
           ],
+        ),
+      ],
     );
   }
 }

lib/pages/help.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/material.dart';
+
+class HelpPage extends StatelessWidget {
+  const HelpPage({
+    super.key,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Column(
+      children: [
+        Expanded(
+          child: Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: Container(
+              decoration: BoxDecoration(
+                borderRadius: BorderRadius.circular(4),
+                color: theme.colorScheme.onPrimary,
+              ),
+              child: Column(
+                children: [
+                  Text("This app is meant to be a simple budgeting tool,"
+                      " allowing you to view your income and expenses at a high level"
+                      " without micro managing specific budget items or adding receipts."),
+                  //Text("Another paragraph.")
+                ],
+              ),
+            ),
+          ),
+        ),
+        Row(
+          children: [
+            Expanded(
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Container(
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(4),
+                    color: theme.colorScheme.onPrimary,
+                  ),
+                  child: TextButton.icon(
+                    onPressed: () {},
+                    icon: Icon(Icons.code),
+                    label: Text("Code Repository"),
+                  ),
+                ),
+              ),
+            ),
+            Expanded(
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Container(
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(4),
+                    color: theme.colorScheme.onPrimary,
+                  ),
+                  child: TextButton.icon(
+                    onPressed: () {},
+                    icon: Icon(Icons.web_asset),
+                    label: Text("Personal Website"),
+                  ),
+                ),
+              ),
+            ),
+          ],
+        )
+      ],
+    );
+  }
+}

lib/pages/income.dart

@@ -7,12 +7,6 @@ class IncomePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Center(
-        child: Column(
-      children: [
-        Text("TBD"),
-        Placeholder(),
-      ],
-    ));
+    return Placeholder();
   }
 }