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

import '../../core/cache/cached.dart';
import '../../core/theme/chart_colors.dart';
import '../../core/widgets/async_value_view.dart';
import '../../core/widgets/money_text.dart';
import '../home/providers.dart' show scopeCardsProvider;
import '../../core/widgets/help_tip.dart';
import 'labels.dart';
import 'providers.dart';

/// The four figures on top of Аналитика → Общее: what the scope is worth, what it earned, its
/// return and the passive income it should bring in a year. Everything comes from the same
/// providers as Портфель and the home cards, so the numbers cannot disagree between screens.
class OverviewTiles extends ConsumerWidget {
  const OverviewTiles({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final summary = ref.watch(portfolioSummaryProvider);
    final scope = ref.watch(scopeProvider);
    final card = ref
        .watch(scopeCardsProvider)
        .valueOrNull
        ?.data
        .where((c) => c.scope == scope)
        .firstOrNull;

    return AsyncValueView<Cached<SummaryOut>>(
      value: summary,
      onRetry: () => ref.invalidate(portfolioSummaryProvider),
      data: (cached) => _Grid(summary: cached.data, card: card),
    );
  }
}

class _Grid extends StatelessWidget {
  const _Grid({required this.summary, required this.card});

  final SummaryOut summary;
  final ScopeCardOut? card;

  static const _gap = 16.0;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final scheme = theme.colorScheme;
    final yearly = summary.returns.where((r) => r.period == '1y').firstOrNull;
    final all = summary.returns.where((r) => r.period == 'all').firstOrNull;
    final xirr = card?.xirr ?? all?.xirr;
    final pnl = summary.pnlTotalRub;
    final pnlShare =
        pnl != null && Decimal.parse(summary.investedNetRub) > Decimal.zero
        ? (Decimal.parse(pnl) / Decimal.parse(summary.investedNetRub))
              .toDecimal(scaleOnInfinitePrecision: 10)
              .toString()
        : null;
    final day = card?.dayChangeRub;
    final income = card?.incomeYearRub;

    Widget muted(String text, {Color? color}) => Text(
      text,
      style: theme.textTheme.bodyMedium?.copyWith(
        color: color ?? scheme.onSurfaceVariant,
      ),
    );

    final tiles = <Widget>[
      _Tile(
        icon: Icons.account_balance_wallet_outlined,
        label: 'Стоимость',
        value: Text(MoneyText.format(summary.totalRub, 'RUB')),
        note: muted(
          '${MoneyText.format(summary.investedNetRub, 'RUB')} вложено',
        ),
      ),
      _Tile(
        icon: Icons.show_chart,
        label: 'Прибыль',
        value: pnl == null
            ? const Text('—')
            : Row(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.baseline,
                textBaseline: TextBaseline.alphabetic,
                children: [
                  Text(
                    (Decimal.parse(pnl) > Decimal.zero ? '+' : '') +
                        MoneyText.format(pnl, 'RUB'),
                    style: TextStyle(color: signColor(context, pnl)),
                  ),
                  if (pnlShare != null)
                    Text(
                      '  ${formatPercent(pnlShare)}',
                      style: theme.textTheme.titleSmall?.copyWith(
                        color: signColor(context, pnl),
                      ),
                    ),
                ],
              ),
        note: day == null
            ? muted(pnl == null ? 'часть позиций без цены' : 'за день —')
            : muted(
                '${Decimal.parse(day) > Decimal.zero ? '+' : ''}${MoneyText.format(day, 'RUB')}'
                '${card?.dayChangePct == null ? '' : '  ${formatPercent(card!.dayChangePct)}'} за день',
                color: signColor(context, day),
              ),
      ),
      _Tile(
        icon: Icons.percent,
        label: 'Доходность',
        value: Text(
          formatPercent(xirr, signed: false),
          style: TextStyle(color: signColor(context, xirr)),
        ),
        note: muted(
          yearly?.twr == null
              ? 'денежно-взвешенная, с начала'
              : 'рост активов ${formatPercent(yearly!.twr)} за год',
        ),
      ),
      _Tile(
        icon: Icons.savings_outlined,
        label: 'Пассивный доход',
        value: Text(
          card?.incomeYearPct == null
              ? '—'
              : formatPercent(card!.incomeYearPct, signed: false),
        ),
        note: muted(
          income == null || Decimal.parse(income) == Decimal.zero
              ? 'прогноза выплат пока нет'
              : '${MoneyText.format(income, 'RUB')} в год',
          color: income == null || Decimal.parse(income) == Decimal.zero
              ? null
              : ChartColors.gain,
        ),
      ),
    ];

    return LayoutBuilder(
      builder: (context, constraints) {
        final width = constraints.maxWidth;
        final columns = width >= 1000 ? 4 : (width >= 560 ? 2 : 1);
        final itemWidth = (width - _gap * (columns - 1)) / columns;
        return Wrap(
          spacing: _gap,
          runSpacing: _gap,
          children: [
            for (final t in tiles) SizedBox(width: itemWidth, child: t),
          ],
        );
      },
    );
  }
}

class _Tile extends StatelessWidget {
  const _Tile({
    required this.icon,
    required this.label,
    required this.value,
    required this.note,
  });

  final IconData icon;
  final String label;
  final Widget value;
  final Widget note;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final scheme = theme.colorScheme;
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  padding: const EdgeInsets.all(6),
                  decoration: BoxDecoration(
                    color: scheme.primary.withValues(alpha: 0.16),
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Icon(icon, size: 18, color: scheme.primary),
                ),
                const SizedBox(width: 10),
                TermLabel(
                  label,
                  hint: label == 'Стоимость'
                      ? 'Стоимость — всё сразу: бумаги по последним ценам плюс деньги на счёте. '
                            'Ниже — сколько вы вложили (пополнения минус выводы).'
                      : null,
                  style: theme.textTheme.bodyLarge?.copyWith(
                    color: scheme.onSurface,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),
            DefaultTextStyle.merge(
              style: theme.textTheme.headlineMedium?.copyWith(
                fontWeight: FontWeight.w500,
              ),
              child: value,
            ),
            const SizedBox(height: 8),
            note,
          ],
        ),
      ),
    );
  }
}