import 'package:aves/model/activity/activity_track.dart';
import 'package:aves/widgets/activity/utils/activity_formatters.dart';
import 'package:flutter/material.dart';

void showActivityRecalculateDialog({
  required BuildContext context,
  required ActivityTrack activity,
}) {
  final fileDistance = activity.fileDistanceMeters ?? activity.distanceMeters;
  final fileElevation = activity.fileElevationGainMeters ?? activity.elevationGainMeters;

  final recomputedDistance = ActivityFormatters.computeDistanceFromTrack(activity);
  final recomputedElevation =
      activity.computedElevationGainMeters ??
      ActivityFormatters.readDiagnosticDouble(
        activity.diagnostics,
        'computedElevationGainMeters',
      );

  showDialog<void>(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: const Text('Confronto ricalcolo'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(activity.displayName),
            const SizedBox(height: 12),
            _CompareLine(
              label: 'Distanza file',
              value: ActivityFormatters.distance(fileDistance),
            ),
            _CompareLine(
              label: 'Distanza ricalcolata',
              value: ActivityFormatters.distance(recomputedDistance),
            ),
            _CompareLine(
              label: 'Differenza distanza',
              value: ActivityFormatters.distanceDelta(
                recomputedDistance,
                fileDistance,
              ),
            ),
            const Divider(height: 24),
            _CompareLine(
              label: 'D+ file',
              value: ActivityFormatters.elevation(fileElevation),
            ),
            _CompareLine(
              label: 'D+ ricalcolato',
              value: recomputedElevation == null ? 'non disponibile dai punti salvati' : ActivityFormatters.elevation(recomputedElevation),
            ),
            _CompareLine(
              label: 'Differenza D+',
              value: recomputedElevation == null
                  ? '-'
                  : ActivityFormatters.elevationDelta(
                      recomputedElevation,
                      fileElevation,
                    ),
            ),
            if (recomputedElevation == null) ...[
              const SizedBox(height: 12),
              const Text(
                'Nota: per ricalcolare il D+ servono le quote dei singoli punti. '
                'Con il modello attuale la lista contiene solo LatLng; per FIT, GPX e TCX uso il valore calcolato dal parser quando disponibile.',
                style: TextStyle(fontSize: 12),
              ),
            ],
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Chiudi'),
          ),
        ],
      );
    },
  );
}

class _CompareLine extends StatelessWidget {
  final String label;
  final String value;

  const _CompareLine({
    required this.label,
    required this.value,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 2),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Flexible(child: Text(label)),
          const SizedBox(width: 16),
          Text(
            value,
            style: const TextStyle(fontWeight: FontWeight.w600),
          ),
        ],
      ),
    );
  }
}