feat(graphs): ✨ render income graph next to expense graph

#8

.vscode/settings.json

@@ -2,6 +2,7 @@
     "conventionalCommits.scopes": [
         "ocr",
         "ui",
-        "translations"
+        "translations",
+        "graphs"
     ]
 }

lib/l10n/app_cs.arb

@@ -59,8 +59,8 @@
     "setupStartingBalance":"Počáteční zůstatek",
     "graphs":"Grafy",
     "createTestData":"Vytvořit vzorková data",
-    "spendingStats":"Statistiky utrácení",
     "yearly":"Roční",
-    "monthly":"Měsíční"
+    "monthly":"Měsíční",
+    "expenses":"Výdaje"
 
 }

lib/l10n/app_en.arb

@@ -95,7 +95,7 @@
     "setupStartingBalance":"Starting balance",
     "graphs":"Graphs",
     "createTestData":"Create test data",
-    "spendingStats":"Spending statistics",
     "yearly":"Yearly",
-    "monthly":"Monthly"
+    "monthly":"Monthly",
+    "expenses":"Expenses"
 }

lib/util/graphs.dart

@@ -1,35 +1,55 @@
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
+import 'package:prasule/main.dart';
 
-/// Monthly/Yearly expenses [LineChart]
+/// Monthly/Yearly expense/income [LineChart]
 class ExpensesChart extends StatelessWidget {
   const ExpensesChart(
       {super.key,
       required this.date,
       required this.locale,
-      this.data = const [],
+      this.expenseData = const [],
+      this.incomeData = const [],
       this.yearly = false});
   final bool yearly;
   final DateTime date;
   final String locale;
-  final List<double> data;
+  final List<double> expenseData;
-  List<double> get dataSorted {
+  List<double> get expenseDataSorted {
-    var list = List<double>.from(data);
+    var list = List<double>.from(expenseData);
     list.sort((a, b) => a.compareTo(b));
     return list;
   }
 
+  final List<double> incomeData;
+  List<double> get incomeDataSorted {
+    var list = List<double>.from(incomeData);
+    list.sort((a, b) => a.compareTo(b));
+    return list;
+  }
+
+  double get maxY {
+    if (incomeData.isEmpty) return expenseDataSorted.last;
+    if (expenseData.isEmpty) return incomeDataSorted.last;
+    if (expenseDataSorted.last > incomeDataSorted.last) {
+      return expenseDataSorted.last;
+    } else {
+      return incomeDataSorted.last;
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return LineChart(
       LineChartData(
         maxX: (yearly) ? 12 : DateTime(date.year, date.month, 0).day.toDouble(),
-        maxY: dataSorted.last,
+        maxY: maxY,
         minX: 1,
         minY: 0,
         backgroundColor: Theme.of(context).colorScheme.background,
         lineBarsData: [
+          if (incomeData.isNotEmpty)
             LineChartBarData(
               isCurved: true,
               barWidth: 8,
@@ -39,7 +59,20 @@ class ExpensesChart extends StatelessWidget {
               color: Theme.of(context).colorScheme.primary,
               spots: List.generate(
                 (yearly) ? 12 : DateTime(date.year, date.month, 0).day,
-              (index) => FlSpot(index.toDouble() + 1, data[index]),
+                (index) => FlSpot(index.toDouble() + 1, incomeData[index]),
+              ),
+            ),
+          if (expenseData.isNotEmpty)
+            LineChartBarData(
+              isCurved: true,
+              barWidth: 8,
+              isStrokeCapRound: true,
+              dotData: const FlDotData(show: false),
+              belowBarData: BarAreaData(show: false),
+              color: Theme.of(context).colorScheme.error,
+              spots: List.generate(
+                (yearly) ? 12 : DateTime(date.year, date.month, 0).day,
+                (index) => FlSpot(index.toDouble() + 1, expenseData[index]),
               ),
             ),
         ], // actual data

lib/views/graph_view.dart

@@ -1,6 +1,7 @@
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
+import 'package:prasule/api/category.dart';
 import 'package:prasule/api/wallet.dart';
 import 'package:prasule/api/walletmanager.dart';
 import 'package:prasule/main.dart';
@@ -25,6 +26,7 @@ class _GraphViewState extends State<GraphView> {
   List<Wallet> wallets = [];
   String? locale;
   var yearlyBtnSet = {"monthly"};
+  var graphTypeSet = {"expense", "income"};
   bool get yearly => yearlyBtnSet.contains("yearly");
 
   @override
@@ -33,20 +35,22 @@ class _GraphViewState extends State<GraphView> {
     locale ??= Localizations.localeOf(context).languageCode;
   }
 
-  List<double> generateChartData() {
+  List<double> generateChartData(EntryType type) {
-    if (selectedWallet == null) return [0];
     var data = List<double>.filled(
         (yearly)
             ? 12
             : DateTime(_selectedDate.year, _selectedDate.month, 0).day,
         0.0);
+    if (selectedWallet == null) return [];
     for (var i = 0; i < data.length; i++) {
-      var entriesForRange = selectedWallet!.entries.where((element) => (!yearly)
+      var entriesForRange = selectedWallet!.entries.where((element) =>
+          ((!yearly)
               ? element.date.month == _selectedDate.month &&
                   element.date.year == _selectedDate.year &&
                   element.date.day == i + 1
               : element.date.month == i + 1 &&
-              element.date.year == _selectedDate.year);
+                  element.date.year == _selectedDate.year) &&
+          element.type == type);
       var sum = 0.0;
       for (var e in entriesForRange) {
         sum += e.data.amount;
@@ -148,12 +152,20 @@ class _GraphViewState extends State<GraphView> {
                 SegmentedButton<String>(
                   segments: [
                     ButtonSegment<String>(
-                      value: "spending",
+                      value: "expense",
-                      label: Text(AppLocalizations.of(context)!.spendingStats),
+                      label: Text(AppLocalizations.of(context)!.expenses),
-                    )
+                    ),
+                    ButtonSegment<String>(
+                      value: "income",
+                      label: Text(AppLocalizations.of(context)!.income),
+                    ),
                   ],
-                  selected: const {"spending"},
+                  selected: graphTypeSet,
-                  // TODO: onSelectionChanged
+                  multiSelectionEnabled: true,
+                  onSelectionChanged: (selection) {
+                    graphTypeSet = selection;
+                    setState(() {});
+                  },
                 ),
                 const SizedBox(
                   height: 5,
@@ -189,6 +201,8 @@ class _GraphViewState extends State<GraphView> {
                           ..sort((a, b) => b.date.compareTo(a.date)))
                         .first
                         .date;
+                    logger.i(firstDate);
+                    logger.i(lastDate);
                     var newDate = await showDatePicker(
                         context: context,
                         initialDate: _selectedDate,
@@ -215,7 +229,12 @@ class _GraphViewState extends State<GraphView> {
                     date: _selectedDate,
                     locale: locale ?? "en",
                     yearly: yearly,
-                    data: generateChartData(),
+                    expenseData: (graphTypeSet.contains("expense"))
+                        ? generateChartData(EntryType.expense)
+                        : [],
+                    incomeData: (graphTypeSet.contains("income"))
+                        ? generateChartData(EntryType.income)
+                        : [],
                   ),
                 )
               ],

lib/views/home.dart

@@ -1,6 +1,4 @@
 import 'dart:math';
-
-import 'package:currency_picker/currency_picker.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_slidable/flutter_slidable.dart';
@@ -87,7 +85,9 @@ class _HomeViewState extends State<HomeView> {
                         name: "Test Entry #${i + 1}",
                         amount: random.nextInt(20000).toDouble(),
                       ),
-                      type: EntryType.expense,
+                      type: (random.nextInt(3) > 0)
+                          ? EntryType.expense
+                          : EntryType.income,
                       date: DateTime(
                         2023,
                         random.nextInt(12) + 1,