import 'package:flutter/material.dart';

import '../data/export_import/seed_label_codec.dart';
import '../data/variety_repository.dart';
import '../di/injector.dart';
import '../i18n/strings.g.dart';
import '../services/label_sheet_service.dart';
import 'quantity_kind_l10n.dart';

/// Opens the print-labels sheet for [entries] (already gathered from the
/// current selection): pick a label size, then save a PDF sheet of labels —
/// each with a QR that carries the seed's data.
Future<void> showLabelPrintSheet(
  BuildContext context,
  List<SeedLabelEntry> entries,
) {
  return showModalBottomSheet<void>(
    context: context,
    isScrollControlled: true,
    builder: (_) => _LabelPrintSheet(entries: entries),
  );
}

class _LabelPrintSheet extends StatefulWidget {
  const _LabelPrintSheet({required this.entries});

  final List<SeedLabelEntry> entries;

  @override
  State<_LabelPrintSheet> createState() => _LabelPrintSheetState();
}

class _LabelPrintSheetState extends State<_LabelPrintSheet> {
  LabelSheetFormat _format = LabelSheetFormat.stickers;
  bool _saving = false;

  @override
  Widget build(BuildContext context) {
    final t = context.t;
    return SafeArea(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              t.printLabels.title,
              style: Theme.of(context).textTheme.titleLarge,
            ),
            const SizedBox(height: 4),
            Text(
              t.printLabels.count(n: widget.entries.length),
              style: Theme.of(context).textTheme.bodyMedium,
            ),
            const SizedBox(height: 8),
            RadioGroup<LabelSheetFormat>(
              groupValue: _format,
              onChanged: _pick,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  RadioListTile<LabelSheetFormat>(
                    key: const Key('printLabels.format.stickers'),
                    value: LabelSheetFormat.stickers,
                    contentPadding: EdgeInsets.zero,
                    title: Text(t.printLabels.formatStickers),
                    subtitle: Text(t.printLabels.formatStickersHint),
                  ),
                  RadioListTile<LabelSheetFormat>(
                    key: const Key('printLabels.format.cards'),
                    value: LabelSheetFormat.cards,
                    contentPadding: EdgeInsets.zero,
                    title: Text(t.printLabels.formatCards),
                    subtitle: Text(t.printLabels.formatCardsHint),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 12),
            Align(
              alignment: AlignmentDirectional.centerEnd,
              child: FilledButton.icon(
                key: const Key('printLabels.save'),
                onPressed: _saving ? null : _save,
                icon: const Icon(Icons.save_alt_outlined),
                label: Text(t.printLabels.save),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _pick(LabelSheetFormat? value) {
    if (value != null) setState(() => _format = value);
  }

  Future<void> _save() async {
    final t = context.t;
    final messenger = ScaffoldMessenger.of(context);
    final navigator = Navigator.of(context);
    final rtl = Directionality.of(context) == TextDirection.rtl;
    setState(() => _saving = true);

    final labels = [for (final e in widget.entries) _toLabel(t, e)];
    final saved = await getIt<LabelSheetService>().saveLabels(
      labels: labels,
      format: _format,
      suggestedName: 'tanemaki-labels-${_today()}.pdf',
      rtl: rtl,
    );

    navigator.pop();
    messenger.showSnackBar(
      SnackBar(
        content: Text(saved ? t.printLabels.saved : t.printLabels.cancelled),
      ),
    );
  }

  /// Builds one printable label from a [SeedLabelEntry]: the visible fields plus
  /// the QR payload (structured, so a future scan can read it).
  LabelSheetLabel _toLabel(Translations t, SeedLabelEntry e) {
    final origin = _origin(e);
    final details = <String>[
      if (e.harvestYear != null) '${e.harvestYear}',
      ?origin,
      if (e.quantity != null) quantityDisplay(t, e.quantity!),
    ];
    return LabelSheetLabel(
      varietyLabel: e.varietyLabel,
      commonName: e.commonName,
      scientificName: e.scientificName,
      details: details.isEmpty ? null : details.join(' · '),
      qrData: SeedLabelCodec.encode(
        SeedLabelData(
          varietyLabel: e.varietyLabel,
          scientificName: e.scientificName,
          commonName: e.commonName,
          year: e.harvestYear,
          origin: origin,
        ),
      ),
    );
  }

  String? _origin(SeedLabelEntry e) {
    final parts = <String>[
      if (e.originName != null && e.originName!.trim().isNotEmpty)
        e.originName!.trim(),
      if (e.originPlace != null && e.originPlace!.trim().isNotEmpty)
        e.originPlace!.trim(),
    ];
    return parts.isEmpty ? null : parts.join(' · ');
  }

  String _today() => DateTime.now().toIso8601String().substring(0, 10);
}