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

import '../../core/widgets/async_value_view.dart';
import '../../core/widgets/empty_state.dart';
import '../../core/widgets/money_text.dart';
import '../imports/data/imports_api.dart' show importErrorMessage;
import '../imports/providers.dart' show invalidateLedgerDependents;
import '../portfolio/labels.dart' show assetClassLabel, formatQty;
import 'data/pending_api.dart';
import 'providers.dart';
import 'widgets/create_instrument_dialog.dart';
import 'widgets/link_instrument_dialog.dart';

/// Нераспознанные инструменты: the queue of report lines whose instrument the server
/// refused to guess. Every row waits for an explicit decision — link, create or ignore.
class PendingInstrumentsPage extends ConsumerStatefulWidget {
  const PendingInstrumentsPage({super.key});

  @override
  ConsumerState<PendingInstrumentsPage> createState() => _PendingInstrumentsPageState();
}

class _PendingInstrumentsPageState extends ConsumerState<PendingInstrumentsPage> {
  int? _busyId;

  void _snack(String message) =>
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));

  Future<void> _run(int id, Future<PendingResolveResult> Function() action) async {
    setState(() => _busyId = id);
    try {
      final result = await action();
      if (!mounted) return;
      ref.invalidate(pendingInstrumentsProvider);
      ref.invalidate(pendingCountProvider);
      // Events moved out of `pending`, so holdings, allocation and the event list changed.
      invalidateLedgerDependents(ref);
      _snack(result.status == 'ignored'
          ? 'Строка помечена как «не инструмент»'
          : 'Привязано событий: ${result.eventsBound}'
              '${result.aliasCreated ? ', добавлен алиас' : ''}');
    } catch (e) {
      if (!mounted) return;
      _snack(importErrorMessage(e));
    } finally {
      if (mounted) setState(() => _busyId = null);
    }
  }

  Future<void> _link(PendingInstrument p) async {
    final instrumentId = await showDialog<int>(
      context: context,
      builder: (_) => LinkInstrumentDialog(
        initialQuery: p.isin ?? p.ticker ?? p.name ?? '',
      ),
    );
    if (instrumentId == null || !mounted) return;
    await _run(p.id, () => ref.read(pendingApiProvider).link(p.id, instrumentId));
  }

  Future<void> _create(PendingInstrument p) async {
    final instrument = await showDialog<NewInstrument>(
      context: context,
      builder: (_) => CreateInstrumentDialog(pending: p),
    );
    if (instrument == null || !mounted) return;
    await _run(p.id, () => ref.read(pendingApiProvider).create(p.id, instrument));
  }

  Future<void> _ignore(PendingInstrument p) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Игнорировать строку?'),
        content: Text('«${p.title}» больше не будет предлагаться к резолву. '
            'Её события останутся без инструмента.'),
        actions: [
          TextButton(
              onPressed: () => Navigator.of(context).pop(false), child: const Text('Отмена')),
          FilledButton(
              onPressed: () => Navigator.of(context).pop(true),
              child: const Text('Игнорировать')),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;
    await _run(p.id, () => ref.read(pendingApiProvider).ignore(p.id));
  }

  @override
  Widget build(BuildContext context) {
    final rows = ref.watch(pendingInstrumentsProvider);

    return Scaffold(
      appBar: AppBar(
        title: const Text('Нераспознанные инструменты'),
        actions: [
          IconButton(
            tooltip: 'Обновить',
            icon: const Icon(Icons.refresh),
            onPressed: () {
              ref.invalidate(pendingInstrumentsProvider);
              ref.invalidate(pendingCountProvider);
            },
          ),
        ],
      ),
      body: RefreshIndicator(
        onRefresh: () async => ref.invalidate(pendingInstrumentsProvider),
        child: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            const _StatusFilter(),
            const SizedBox(height: 8),
            AsyncValueView(
              value: rows,
              onRetry: () => ref.invalidate(pendingInstrumentsProvider),
              data: (items) => items.isEmpty
                  ? const Padding(
                      padding: EdgeInsets.only(top: 48),
                      child: EmptyState(
                        icon: Icons.check_circle_outline,
                        message: 'Нераспознанных инструментов нет.',
                      ),
                    )
                  : Column(
                      children: [
                        for (final p in items)
                          _PendingCard(
                            pending: p,
                            busy: _busyId == p.id,
                            onLink: () => _link(p),
                            onCreate: () => _create(p),
                            onIgnore: () => _ignore(p),
                          ),
                      ],
                    ),
            ),
          ],
        ),
      ),
    );
  }
}

class _StatusFilter extends ConsumerWidget {
  const _StatusFilter();

  static const _options = {
    'pending': 'Ждут решения',
    'resolved': 'Привязаны',
    'ignored': 'Игнорируются',
    'all': 'Все',
  };

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final current = ref.watch(pendingStatusFilterProvider);
    return Wrap(
      spacing: 8,
      children: [
        for (final e in _options.entries)
          ChoiceChip(
            label: Text(e.value),
            selected: current == e.key,
            onSelected: (_) => ref.read(pendingStatusFilterProvider.notifier).state = e.key,
          ),
      ],
    );
  }
}

class _PendingCard extends StatelessWidget {
  const _PendingCard({
    required this.pending,
    required this.busy,
    required this.onLink,
    required this.onCreate,
    required this.onIgnore,
  });

  final PendingInstrument pending;
  final bool busy;
  final VoidCallback onLink;
  final VoidCallback onCreate;
  final VoidCallback onIgnore;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final p = pending;
    final open = p.status == 'pending';

    final facts = <String>[
      if (p.isin != null) 'ISIN ${p.isin}',
      if (p.ticker != null) 'тикер ${p.ticker}',
      if (p.board != null) 'доска ${p.board}',
      if (p.currency != null) p.currency!,
      if (p.assetClassHint != null) 'в отчёте: ${assetClassLabel(p.assetClassHint)}',
    ];
    final sample = <String>[
      'встречается ${p.occurrences} раз',
      if (p.sampleQuantity != null) 'кол-во ${formatQty(p.sampleQuantity!)}',
      if (p.samplePrice != null)
        'цена ${MoneyText.format(p.samplePrice!, p.currency ?? 'RUB')}',
    ];

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Expanded(child: Text(p.title, style: theme.textTheme.titleMedium)),
                if (!open)
                  Chip(
                    visualDensity: VisualDensity.compact,
                    label: Text(p.status == 'ignored' ? 'игнорируется' : 'привязан'),
                  ),
              ],
            ),
            if (facts.isNotEmpty)
              Padding(
                padding: const EdgeInsets.only(top: 4),
                child: Text(facts.join(' · '), style: theme.textTheme.bodySmall),
              ),
            Padding(
              padding: const EdgeInsets.only(top: 2),
              child: Text(sample.join(' · '), style: theme.textTheme.bodySmall),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 2),
              child: Text(
                'источник ${p.source} · ключ ${p.sourceKey}'
                '${p.firstSeenFileId != null ? ' · файл №${p.firstSeenFileId}' : ''}',
                style: theme.textTheme.bodySmall?.copyWith(color: theme.colorScheme.outline),
              ),
            ),
            if (open) ...[
              const SizedBox(height: 12),
              if (busy)
                const Padding(
                  padding: EdgeInsets.symmetric(vertical: 8),
                  child: LinearProgressIndicator(),
                )
              else
                Wrap(
                  spacing: 12,
                  runSpacing: 8,
                  children: [
                    FilledButton.tonalIcon(
                      onPressed: onLink,
                      icon: const Icon(Icons.link, size: 18),
                      label: const Text('Привязать к существующему'),
                    ),
                    OutlinedButton.icon(
                      onPressed: onCreate,
                      icon: const Icon(Icons.add, size: 18),
                      label: const Text('Создать новый'),
                    ),
                    TextButton.icon(
                      onPressed: onIgnore,
                      icon: const Icon(Icons.block, size: 18),
                      label: const Text('Игнорировать'),
                    ),
                  ],
                ),
            ],
          ],
        ),
      ),
    );
  }
}