prasule/lib/util/graphs.dart

import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:prasule/main.dart';

/// Monthly/Yearly expense/income [LineChart]
class ExpensesChart extends StatelessWidget {
  const ExpensesChart(
      {super.key,
      required this.date,
      required this.locale,
      this.expenseData = const [],
      this.incomeData = const [],
      this.yearly = false});
  final bool yearly;
  final DateTime date;
  final String locale;
  final List<double> expenseData;
  List<double> get expenseDataSorted {
    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: maxY,
        minX: 1,
        minY: 0,
        backgroundColor: Theme.of(context).colorScheme.background,
        lineBarsData: [
          if (incomeData.isNotEmpty)
            LineChartBarData(
              isCurved: true,
              barWidth: 8,
              isStrokeCapRound: true,
              dotData: const FlDotData(show: false),
              belowBarData: BarAreaData(show: false),
              color: Theme.of(context).colorScheme.primary,
              spots: List.generate(
                (yearly) ? 12 : DateTime(date.year, date.month, 0).day,
                (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
        titlesData: FlTitlesData(
          rightTitles: const AxisTitles(
            sideTitles: SideTitles(showTitles: false),
          ),
          topTitles: const AxisTitles(
            sideTitles: SideTitles(showTitles: false),
          ),
          bottomTitles: AxisTitles(
            sideTitles: SideTitles(
              showTitles: true,
              getTitlesWidget: (value, meta) {
                String text;
                if (yearly) {
                  text = DateFormat.MMM(locale).format(
                    DateTime(date.year, value.toInt(), 1),
                  );
                } else {
                  text = value.toInt().toString();
                }
                return SideTitleWidget(
                    axisSide: meta.axisSide, child: Text(text));
              },
            ),
          ),
        ), // axis descriptions
      ),
    );
  }
}