fin-tracker/app/lib/features/tax/summary_tab.dart

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 '../../core/widgets/section_card.dart';
import '../portfolio/labels.dart' show formatPercent, signColor;
import 'data/tax_api.dart';
import 'providers.dart';

/// Сводка: the estimated tax picture for the year, per account and in total.
class TaxSummaryTab extends ConsumerWidget {
  const TaxSummaryTab({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final summary = ref.watch(taxSummaryProvider);

    return RefreshIndicator(
      onRefresh: () async => ref.invalidate(taxSummaryProvider),
      child: AsyncValueView(
        value: summary,
        onRetry: () => ref.invalidate(taxSummaryProvider),
        data: (cached) {
          final data = cached.data;
          final totals = data.totals;
          return ListView(
            padding: const EdgeInsets.all(16),
            children: [
              Row(
                children: [
                  Text('${data.year} год', style: Theme.of(context).textTheme.titleLarge),
                  const SizedBox(width: 12),
                  if (data.estimated)
                    const Chip(
                      avatar: Icon(Icons.calculate_outlined, size: 16),
                      label: Text('оценка'),
                      visualDensity: VisualDensity.compact,
                    ),
                  const Spacer(),
                  if (data.taxRate != null)
                    Text('ставка ${formatPercent(data.taxRate, signed: false)}'),
                ],
              ),
              const SizedBox(height: 12),
              if (totals != null) ...[
                Wrap(
                  spacing: 12,
                  runSpacing: 12,
                  children: [
                    StatTile(
                      label: 'Оценка налога',
                      value: _money(totals.estimatedTaxRub),
                      note: 'по всем счетам за год',
                    ),
                    StatTile(
                      label: 'Удержано брокером',
                      value: _money(totals.taxWithheldRub),
                      note: 'по данным операций',
                    ),
                    StatTile(
                      label: 'Налоговая база',
                      value: _money(totals.taxableBaseRub),
                      note: 'после вычета ЛДВ',
                    ),
                    StatTile(
                      label: 'Освобождено по ЛДВ',
                      value: _money(totals.ldvExemptRub),
                      note: 'оценка по ст. 219.1',
                    ),
                    StatTile(
                      label: 'Дивиденды и купоны',
                      value: _money(totals.dividendsGrossRub),
                      note: 'купоны ${_moneyText(totals.couponsGrossRub)}',
                    ),
                    StatTile(
                      label: 'Реализовано',
                      value: _money(totals.realizedGainRub),
                      note: 'убыток ${_moneyText(totals.realizedLossRub)}',
                    ),
                  ],
                ),
                const SizedBox(height: 16),
              ],
              if (data.accounts.isEmpty)
                const Padding(
                  padding: EdgeInsets.only(top: 32),
                  child: EmptyState(
                    icon: Icons.receipt_long_outlined,
                    message: 'За этот год нет ни сделок, ни выплат.',
                  ),
                )
              else
                SectionCard(
                  title: 'По счетам',
                  subtitle: 'все суммы — оценка; авторитет — справка брокера',
                  child: _AccountsTable(rows: data.accounts, totals: totals),
                ),
            ],
          );
        },
      ),
    );
  }

  static Widget _money(String? value) =>
      value == null ? const Text('—') : MoneyText(value, currency: 'RUB');

  static String _moneyText(String? value) =>
      value == null ? '—' : MoneyText.format(value, 'RUB');
}

class _AccountsTable extends StatelessWidget {
  const _AccountsTable({required this.rows, this.totals});

  final List<TaxRow> rows;
  final TaxRow? totals;

  @override
  Widget build(BuildContext context) {
    final headerStyle = Theme.of(context).textTheme.labelMedium;
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      child: DataTable(
        columns: [
          DataColumn(label: Text('Счёт', style: headerStyle)),
          DataColumn(label: Text('Дивиденды', style: headerStyle), numeric: true),
          DataColumn(label: Text('Купоны', style: headerStyle), numeric: true),
          DataColumn(label: Text('Удержано', style: headerStyle), numeric: true),
          DataColumn(label: Text('Прибыль', style: headerStyle), numeric: true),
          DataColumn(label: Text('Убыток', style: headerStyle), numeric: true),
          DataColumn(label: Text('ЛДВ', style: headerStyle), numeric: true),
          DataColumn(label: Text('База', style: headerStyle), numeric: true),
          DataColumn(label: Text('Налог (оценка)', style: headerStyle), numeric: true),
        ],
        rows: [
          for (final r in rows) _row(context, r, bold: false),
          if (totals != null) _row(context, totals!, bold: true),
        ],
      ),
    );
  }

  DataRow _row(BuildContext context, TaxRow r, {required bool bold}) {
    final style = bold ? Theme.of(context).textTheme.titleSmall : null;
    Widget cell(String? v, {bool signed = false}) => v == null
        ? Text('—', style: style)
        : MoneyText(
            v,
            currency: 'RUB',
            style: signed ? (style ?? const TextStyle()).copyWith(color: signColor(context, v)) : style,
          );

    return DataRow(
      cells: [
        DataCell(Text(bold ? 'Итого' : r.title, style: style)),
        DataCell(cell(r.dividendsGrossRub)),
        DataCell(cell(r.couponsGrossRub)),
        DataCell(cell(r.taxWithheldRub)),
        DataCell(cell(r.realizedGainRub, signed: true)),
        DataCell(cell(r.realizedLossRub, signed: true)),
        DataCell(cell(r.ldvExemptRub)),
        DataCell(cell(r.taxableBaseRub)),
        DataCell(cell(r.estimatedTaxRub)),
      ],
    );
  }
}