import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';

class DurationBarChart extends StatelessWidget {
  const DurationBarChart({
    super.key,
    required this.values,
    required this.labels,
  });

  /// Values in minutes (one per bar)
  final List<double> values;

  /// X-axis labels (e.g. ['Mon', 'Tue', …])
  final List<String> labels;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final maxY = values.isEmpty
        ? 60.0
        : (values.reduce((a, b) => a > b ? a : b) * 1.2).clamp(30.0, double.infinity);

    return BarChart(
      BarChartData(
        maxY: maxY,
        barGroups: List.generate(values.length, (i) {
          return BarChartGroupData(
            x: i,
            barRods: [
              BarChartRodData(
                toY: values[i],
                color: colorScheme.primary,
                width: 16,
                borderRadius: const BorderRadius.vertical(top: Radius.circular(4)),
              ),
            ],
          );
        }),
        titlesData: FlTitlesData(
          leftTitles: AxisTitles(
            sideTitles: SideTitles(
              showTitles: true,
              reservedSize: 36,
              getTitlesWidget: (value, meta) => Text(
                '${(value / 60).toStringAsFixed(0)}h',
                style: Theme.of(context).textTheme.labelSmall,
              ),
            ),
          ),
          bottomTitles: AxisTitles(
            sideTitles: SideTitles(
              showTitles: true,
              getTitlesWidget: (value, meta) {
                final idx = value.toInt();
                if (idx < 0 || idx >= labels.length) return const SizedBox.shrink();
                return Text(
                  labels[idx],
                  style: Theme.of(context).textTheme.labelSmall,
                );
              },
            ),
          ),
          rightTitles: const AxisTitles(sideTitles: SideTitles(showTitles: false)),
          topTitles: const AxisTitles(sideTitles: SideTitles(showTitles: false)),
        ),
        gridData: FlGridData(
          drawVerticalLine: false,
          getDrawingHorizontalLine: (value) => FlLine(
            color: colorScheme.outlineVariant,
            strokeWidth: 0.5,
          ),
        ),
        borderData: FlBorderData(show: false),
      ),
    );
  }
}