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 'package:go_router/go_router.dart';

import '../../core/theme/chart_colors.dart';
import '../../core/widgets/help_tip.dart';
import '../../core/widgets/money_text.dart';
import '../portfolio/labels.dart' show formatPercent, signColor;
import '../portfolio/providers.dart' show scopeProvider;

/// The home grid: a card per portfolio and account — value, result, the last day, return and
/// expected passive income at a glance. A tap opens Портфель scoped to that card.
class ScopeCards extends ConsumerWidget {
  const ScopeCards({required this.cards, super.key});

  final List<ScopeCardOut> cards;

  static const _gap = 16.0;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final width = constraints.maxWidth;
        final columns = width >= 980 ? 3 : (width >= 620 ? 2 : 1);
        final itemWidth = (width - _gap * (columns - 1)) / columns;
        return Wrap(
          spacing: _gap,
          runSpacing: _gap,
          children: [
            for (final c in cards)
              SizedBox(
                width: itemWidth,
                child: ScopeCard(
                  card: c,
                  onTap: () {
                    ref.read(scopeProvider.notifier).state = c.scope;
                    context.go('/portfolio');
                  },
                ),
              ),
          ],
        );
      },
    );
  }
}

IconData _icon(String kind) => switch (kind) {
  'all' => Icons.layers_outlined,
  'portfolio' => Icons.layers,
  _ => Icons.account_balance_wallet_outlined,
};

class ScopeCard extends StatelessWidget {
  const ScopeCard({required this.card, required this.onTap, super.key});

  final ScopeCardOut card;
  final VoidCallback onTap;

  static String _money(String? v) =>
      v == null ? '—' : MoneyText.format(v, 'RUB');

  /// `+6 643,47 ₽` — a signed amount; a plain minus and plus, never a bare number.
  static String _signedMoney(String? v) {
    if (v == null) return '—';
    final d = Decimal.parse(v);
    final text = MoneyText.format(v, 'RUB');
    return d > Decimal.zero ? '+$text' : text;
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final scheme = theme.colorScheme;
    final label = theme.textTheme.bodyMedium?.copyWith(
      color: scheme.onSurfaceVariant,
    );

    Widget row(String name, Widget value) => Padding(
      padding: const EdgeInsets.only(top: 6),
      child: Row(
        children: [
          Expanded(
            child: Align(
              alignment: Alignment.centerLeft,
              child: TermLabel(name, style: label),
            ),
          ),
          value,
        ],
      ),
    );

    /// «+6 643,47 ₽ (▲ 1,5 %)» in the colour of its sign.
    Widget change(String? amount, String? share) {
      if (amount == null) return const Text('—');
      final color = signColor(context, amount) ?? scheme.onSurface;
      final positive = Decimal.parse(amount) > Decimal.zero;
      final negative = Decimal.parse(amount) < Decimal.zero;
      return Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Text(_signedMoney(amount), style: TextStyle(color: color)),
          if (share != null) ...[
            Text(' (', style: TextStyle(color: color)),
            if (positive || negative)
              Icon(
                positive ? Icons.arrow_drop_up : Icons.arrow_drop_down,
                size: 18,
                color: color,
              ),
            Text(
              formatPercent(share, signed: false).replaceAll('-', ''),
              style: TextStyle(color: color),
            ),
            Text(')', style: TextStyle(color: color)),
          ],
        ],
      );
    }

    final income = Decimal.parse(card.incomeYearRub);
    return Card(
      child: InkWell(
        onTap: onTap,
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Icon(
                    _icon(card.kind),
                    size: 18,
                    color: scheme.onSurfaceVariant,
                  ),
                  const SizedBox(width: 8),
                  Expanded(
                    child: Text(
                      card.name.toUpperCase(),
                      overflow: TextOverflow.ellipsis,
                      style: theme.textTheme.labelLarge?.copyWith(
                        color: scheme.onSurface,
                        letterSpacing: 0.4,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 12),
              Text(
                _money(card.totalRub),
                style: theme.textTheme.headlineSmall?.copyWith(
                  fontWeight: FontWeight.w500,
                ),
              ),
              const SizedBox(height: 8),
              row('Прибыль', change(card.pnlRub, card.pnlPct)),
              row('За день', change(card.dayChangeRub, card.dayChangePct)),
              row(
                'Доходность',
                Text(
                  card.xirr == null
                      ? '—'
                      : formatPercent(card.xirr, signed: false),
                  style: TextStyle(color: signColor(context, card.xirr)),
                ),
              ),
              row(
                'Пассивный доход',
                Text(
                  income == Decimal.zero
                      ? '—'
                      : '${card.incomeYearPct == null ? '' : '${formatPercent(card.incomeYearPct, signed: false)} '}'
                            '(${MoneyText.format(card.incomeYearRub, 'RUB')})',
                  style: TextStyle(
                    color: income == Decimal.zero
                        ? scheme.onSurfaceVariant
                        : ChartColors.gain,
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}