stacked bar graph, edit / remove transaction & budget page base

lib/domains/charts/chart_bloc.dart

@@ -1,5 +1,8 @@
+import 'dart:ui';
+
 import 'package:equatable/equatable.dart';
 import 'package:fl_chart/fl_chart.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:tunas/domains/account/models/transaction_line.dart';
 import 'package:tunas/domains/charts/models/chart_item.dart';
@@ -9,6 +12,29 @@ import 'package:tunas/repositories/account/models/transaction.dart';
 part 'chart_event.dart';
 part 'chart_state.dart';
 
+final colors = [
+  Colors.purple.shade300,
+  Colors.purple.shade500,
+  Colors.purple.shade700,
+  Colors.purple.shade900,
+  Colors.blue.shade300,
+  Colors.blue.shade500,
+  Colors.blue.shade700,
+  Colors.blue.shade900,
+  Colors.green.shade300,
+  Colors.green.shade500,
+  Colors.green.shade700,
+  Colors.green.shade900,
+  Colors.yellow.shade300,
+  Colors.yellow.shade500,
+  Colors.yellow.shade700,
+  Colors.yellow.shade900,
+  Colors.red.shade300,
+  Colors.red.shade500,
+  Colors.red.shade700,
+  Colors.red.shade900,
+];
+
 class ChartBloc extends Bloc<ChartEvent, ChartState> {
   final AccountRepository _accountRepository;
 
@@ -95,7 +121,9 @@ class ChartBloc extends Bloc<ChartEvent, ChartState> {
     List<ChartItem> scopedCategoriesPositiveTotals = [];
     List<ChartItem> scopedCategoriesNegativeTotals = [];
     Map<int, FlSpot> scopedMonthlyTotals = {};
-    Map<String, Map<String, double>> scopedCategoriesMonthlyTotals = {};
+    Map<int, Map<String, double>> scopedCategoriesMonthlyTotals = {};
+    Map<String, Color> categoriesColors = {};
+    int colorIndex = 0;
 
     for(var transaction in state.transactions) {
       double subTotal = globalTotal + transaction.value;
@@ -120,6 +148,11 @@ class ChartBloc extends Bloc<ChartEvent, ChartState> {
         continue;
       }
 
+      if (categoriesColors[transaction.category] == null) {
+        categoriesColors[transaction.category] = colors[colorIndex];
+        colorIndex++;
+      }
+
       if (transaction.value >= 0) {
         ChartItem? chartItem = scopedCategoriesPositiveTotals.firstWhere(
           (item) => item.label == transaction.category,
@@ -142,7 +175,16 @@ class ChartBloc extends Bloc<ChartEvent, ChartState> {
           }
         );
         chartItem.value += transaction.value;
+
+        Map<String, double>? a = scopedCategoriesMonthlyTotals[transaction.date.month];
+        if (scopedCategoriesMonthlyTotals[transaction.date.month] == null) {
+          a = {};
+        }
+
+        a?[transaction.category] = transaction.value.abs() + (a[transaction.category] ?? 0);
+        scopedCategoriesMonthlyTotals[transaction.date.month] = a!;
       }
+      
     }
 
     List<ChartItem> scopedCategoriesPositiveTotalsPercents = [];
@@ -202,6 +244,7 @@ class ChartBloc extends Bloc<ChartEvent, ChartState> {
       scopedSimplifiedCategoriesNegativeTotalsPercents: scopedSimplifiedCategoriesNegativeTotalsPercents,
       scopedMonthlyTotals: scopedMonthlyTotals.values.toList(),
       scopedCategoriesMonthlyTotals: scopedCategoriesMonthlyTotals,
+      categoriesColors: categoriesColors,
     );
   }
 }