selfprivacy.org.app/lib/ui/pages/server_details/charts/disk_charts.dart

import 'package:easy_localization/easy_localization.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
import 'package:selfprivacy/logic/common_enum/common_enum.dart';
import 'package:selfprivacy/logic/models/metrics.dart';
import 'package:selfprivacy/ui/pages/server_details/charts/bottom_title.dart';
import 'package:selfprivacy/ui/pages/server_details/server_details_screen.dart';

class DiskChart extends StatelessWidget {
  const DiskChart({
    required this.diskData,
    required this.period,
    required this.start,
    super.key,
  });

  final List<DiskGraphData> diskData;
  final Period period;
  final DateTime start;

  List<FlSpot> getSpots(final List<TimeSeriesData> data) {
    var i = 0;
    final List<FlSpot> res = [];

    for (final d in data) {
      res.add(FlSpot(i.toDouble(), d.value));
      i++;
    }

    return res;
  }

  String screenReaderDescription(final BuildContext context) {
    final buffer = StringBuffer();
    buffer.write(
      'resource_chart.disk_chart_screen_reader_explanation.beginning'.tr(
        namedArgs: {
          'period': 'resource_chart.${period.name}'.tr(),
        },
      ),
    );

    for (final disk in diskData) {
      final lastData = disk.diskData.last;
      final lastValue = lastData.value;

      final firstData = disk.diskData.first;
      final firstValue = firstData.value;

      buffer.write(
        'resource_chart.disk_chart_screen_reader_explanation.disk'.tr(
          namedArgs: {
            'disk': disk.volume.displayName,
            'beginningValue': firstValue.toStringAsFixed(1),
            'endValue': lastValue.toStringAsFixed(1),
          },
        ),
      );
    }
    return buffer.toString();
  }

  @override
  Widget build(final BuildContext context) => Semantics(
        label: screenReaderDescription(context),
        child: LineChart(
          LineChartData(
            lineTouchData: LineTouchData(
              enabled: true,
              touchTooltipData: LineTouchTooltipData(
                getTooltipColor: (final LineBarSpot _) =>
                    Theme.of(context).colorScheme.surface,
                tooltipPadding: const EdgeInsets.all(8),
                getTooltipItems: (final List<LineBarSpot> touchedBarSpots) {
                  final List<LineTooltipItem> res = [];

                  bool timeShown = false;
                  for (final spot in touchedBarSpots) {
                    final value = spot.y;
                    final date = diskData.first.diskData[spot.x.toInt()].time;

                    res.add(
                      LineTooltipItem(
                        '${timeShown ? '' : DateFormat('HH:mm dd.MM.yyyy').format(date)} ${diskData[spot.barIndex].volume.displayName} ${value.toInt()}%',
                        TextStyle(
                          color: Theme.of(context).colorScheme.onSurface,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    );

                    timeShown = true;
                  }

                  return res;
                },
              ),
            ),
            lineBarsData: diskData
                .map<LineChartBarData>(
                  (final disk) => LineChartBarData(
                    spots: getSpots(disk.diskData),
                    isCurved: false,
                    barWidth: 2,
                    color: disk.color,
                    dotData: const FlDotData(
                      show: false,
                    ),
                    belowBarData: BarAreaData(
                      show: true,
                      gradient: LinearGradient(
                        colors: [
                          disk.color.withOpacity(0.5),
                          disk.color.withOpacity(0.0),
                        ],
                        begin: Alignment.bottomCenter,
                        end: Alignment.topCenter,
                      ),
                    ),
                  ),
                )
                .toList(),
            minY: 0,
            maxY: 100,
            minX: 0,
            titlesData: FlTitlesData(
              topTitles: const AxisTitles(
                sideTitles: SideTitles(showTitles: false),
              ),
              bottomTitles: AxisTitles(
                sideTitles: SideTitles(
                  interval: 40,
                  reservedSize: 30,
                  getTitlesWidget: (final value, final titleMeta) => Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: ExcludeSemantics(
                      child: Text(
                        bottomTitle(
                          value.toInt(),
                          diskData.first.diskData,
                          period,
                        ),
                        style: Theme.of(context).textTheme.labelSmall?.copyWith(
                              color: Theme.of(context)
                                  .colorScheme
                                  .onSurfaceVariant,
                            ),
                      ),
                    ),
                  ),
                  showTitles: true,
                ),
              ),
              leftTitles: const AxisTitles(
                sideTitles: SideTitles(showTitles: false),
              ),
              rightTitles: const AxisTitles(
                sideTitles: SideTitles(
                  showTitles: false,
                ),
              ),
            ),
            gridData: FlGridData(
              show: true,
              drawVerticalLine: true,
              verticalInterval: 40,
              horizontalInterval: 25,
              getDrawingHorizontalLine: (final value) => FlLine(
                color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                strokeWidth: 1,
              ),
              getDrawingVerticalLine: (final value) => FlLine(
                color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                strokeWidth: 1,
              ),
            ),
            borderData: FlBorderData(
              show: true,
              border: Border(
                bottom: BorderSide(
                  color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                  width: 1,
                ),
                left: BorderSide(
                  color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                  width: 1,
                ),
                right: BorderSide(
                  color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                  width: 1,
                ),
                top: BorderSide(
                  color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                  width: 1,
                ),
              ),
            ),
          ),
        ),
      );

  bool checkToShowTitle(
    final double minValue,
    final double maxValue,
    final SideTitles sideTitles,
    final double appliedInterval,
    final double value,
  ) {
    if (value < 0) {
      return false;
    } else if (value == 0) {
      return true;
    }

    final diff = value - minValue;
    final finalValue = diff / 20;
    return finalValue - finalValue.floor() == 0;
  }
}