eatvio_app/lib/features/insights/presentation/charts/intra_day_chart.dart

import 'package:eatvio_app/features/insights/models/insights_payload_model.dart';
import 'package:eatvio_app/features/insights/presentation/charts/insights_chart_common.dart';
import 'package:eatvio_app/features/insights/presentation/widgets/insights_colors.dart';
import 'package:eatvio_app/generated/l10n.dart';
import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_charts/charts.dart';

/// График «В течение дня»: столбики Б/Ж/У (ккал) по приёмам пищи на оси 0–24 ч,
/// линии сытости и настроения (шкала 0–5) и затемнение времени сна.
///
/// [visibility] — Белки, Жиры, Углеводы, Сытость, Настроение.
class IntraDayChart extends StatelessWidget {
  const IntraDayChart({
    super.key,
    required this.model,
    required this.visibility,
    required this.showSleep,
  });

  final IntraChartModel model;
  final List<bool> visibility;
  final bool showSleep;

  static const String _scaleAxisName = 'scale';
  static const double _barWidthPx = 26;
  static const double _axesReservedWidthPx = 80;

  @override
  Widget build(BuildContext context) {
    final s = S.of(context);
    if (model.bars.isEmpty &&
        model.satiety.isEmpty &&
        model.mood.isEmpty &&
        model.wake == null &&
        model.sleep == null) {
      return InsightsChartPlaceholder(text: s.insights_not_enough);
    }

    return SizedBox(
      height: insightsChartHeight,
      child: LayoutBuilder(
        builder: (context, constraints) {
          final plotWidth = (constraints.maxWidth - _axesReservedWidthPx).clamp(
            120.0,
            double.infinity,
          );
          final barFraction = (_barWidthPx / (plotWidth / 24)).clamp(0.1, 1.0);
          return SfCartesianChart(
            key: const Key('insights_intra_chart'),
            margin: insightsChartMargin,
            plotAreaBorderWidth: 0,
            primaryXAxis: NumericAxis(
              minimum: 0,
              maximum: 24,
              interval: 2,
              labelStyle: insightsAxisLabelStyle,
              majorGridLines: const MajorGridLines(width: 0),
              majorTickLines: const MajorTickLines(size: 0),
              axisLine: const AxisLine(color: InsightsColors.border, width: 1),
              axisLabelFormatter: (details) => ChartAxisLabel(
                '${details.value.toInt().toString().padLeft(2, '0')}:00',
                details.textStyle,
              ),
              plotBands: _sleepBands(),
            ),
            primaryYAxis: NumericAxis(
              minimum: 0,
              title: AxisTitle(
                text: s.insights_unit_kcal_per_meal,
                textStyle: insightsAxisLabelStyle,
              ),
              labelStyle: insightsAxisLabelStyle,
              majorTickLines: const MajorTickLines(size: 0),
              axisLine: const AxisLine(width: 0),
              majorGridLines: MajorGridLines(
                color: InsightsColors.border.withValues(alpha: 0.8),
                dashArray: const [4, 4],
              ),
            ),
            axes: const <ChartAxis>[
              NumericAxis(
                name: _scaleAxisName,
                opposedPosition: true,
                minimum: 0,
                maximum: 5,
                interval: 1,
                labelStyle: insightsAxisLabelStyle,
                majorTickLines: MajorTickLines(size: 0),
                axisLine: AxisLine(width: 0),
                majorGridLines: MajorGridLines(width: 0),
              ),
            ],
            trackballBehavior: buildInsightsTrackball(),
            series: <CartesianSeries<dynamic, double>>[
              if (_isVisible(0))
                _barSeries(
                  s.insights_series_proteins,
                  InsightsColors.proteins,
                  (bar) => bar.p,
                  barFraction,
                ),
              if (_isVisible(1))
                _barSeries(
                  s.insights_series_fats,
                  InsightsColors.fats,
                  (bar) => bar.f,
                  barFraction,
                ),
              if (_isVisible(2))
                _barSeries(
                  s.insights_series_carbs,
                  InsightsColors.carbs,
                  (bar) => bar.c,
                  barFraction,
                  borderRadius: const BorderRadius.vertical(
                    top: Radius.circular(6),
                  ),
                ),
              if (_isVisible(3) && model.satiety.isNotEmpty)
                _scaleSeries(
                  s.insights_series_satiety,
                  InsightsColors.satiety,
                  model.satiety,
                ),
              if (_isVisible(4) && model.mood.isNotEmpty)
                _scaleSeries(
                  s.insights_series_mood,
                  InsightsColors.mood,
                  model.mood,
                ),
            ],
          );
        },
      ),
    );
  }

  bool _isVisible(int index) =>
      index < visibility.length ? visibility[index] : true;

  CartesianSeries<IntraBarModel, double> _barSeries(
    String name,
    Color color,
    double Function(IntraBarModel bar) valueOf,
    double widthFraction, {
    BorderRadius borderRadius = BorderRadius.zero,
  }) {
    return StackedColumnSeries<IntraBarModel, double>(
      name: name,
      dataSource: model.bars,
      xValueMapper: (bar, _) => bar.x,
      yValueMapper: (bar, _) => valueOf(bar),
      color: color,
      width: widthFraction,
      spacing: 0,
      borderRadius: borderRadius,
    );
  }

  CartesianSeries<ScalePointModel, double> _scaleSeries(
    String name,
    Color color,
    List<ScalePointModel> points,
  ) {
    return SplineSeries<ScalePointModel, double>(
      name: name,
      yAxisName: _scaleAxisName,
      dataSource: points,
      xValueMapper: (point, _) => point.x,
      yValueMapper: (point, _) => point.y,
      splineType: insightsSplineType,
      color: color,
      width: 2.5,
      markerSettings: MarkerSettings(
        isVisible: true,
        width: 3,
        height: 3,
        color: color,
        borderColor: color,
      ),
    );
  }

  /// Затемнение `[0, wake]` и `[sleep, 24]` плюс пунктиры подъёма и отхода ко сну.
  List<PlotBand> _sleepBands() {
    if (!showSleep) {
      return const [];
    }
    final wake = model.wake;
    final sleep = model.sleep;
    return [
      if (wake != null && wake > 0)
        PlotBand(start: 0, end: wake, color: InsightsColors.sleepShade),
      if (sleep != null && sleep < 24 && (wake == null || sleep > wake))
        PlotBand(start: sleep, end: 24, color: InsightsColors.sleepShade),
      if (wake != null)
        PlotBand(
          start: wake,
          end: wake,
          borderColor: InsightsColors.wake,
          borderWidth: 1.5,
          dashArray: const [5, 4],
        ),
      if (sleep != null)
        PlotBand(
          start: sleep,
          end: sleep,
          borderColor: InsightsColors.sleepLine,
          borderWidth: 1.5,
          dashArray: const [5, 4],
        ),
    ];
  }
}