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

import '../../core/theme/chart_colors.dart';
import '../../core/utils/ru_date.dart';

/// Russian labels for the keys the API sends as stable identifiers.
///
/// The backend deliberately stores keys, not labels — `bucket` is `bond`, `cash`,
/// `unknown`, a country code or a currency — so the language lives here, on the one side
/// that has a language at all.
const assetClassLabels = {
  'share': 'Акции',
  'bond': 'Облигации',
  'etf': 'Фонды',
  'fund': 'ПИФы',
  'currency': 'Валюта',
  'index': 'Индексы',
  'deposit': 'Депозиты',
  'real_estate': 'Недвижимость',
  'crypto': 'Криптовалюта',
  'custom': 'Прочее',
};

const _countryLabels = {
  'RU': 'Россия',
  'US': 'США',
  'KZ': 'Казахстан',
  'CY': 'Кипр',
  'NL': 'Нидерланды',
};

const dimensionLabels = {
  'asset_class': 'Класс актива',
  'sector': 'Сектор',
  'country': 'Страна',
  'currency': 'Валюта',
};

String assetClassLabel(String? value) =>
    assetClassLabels[value] ?? value ?? '—';

/// A bucket key as a person reads it. `cash` and `unknown` are the two literals the
/// allocation step emits; everything else is the source's own value.
String bucketLabel(AllocationDimension dimension, String bucket) {
  if (bucket == 'cash') return 'Денежные средства';
  if (bucket == 'unknown') return 'Не указано';
  // `.value` is the wire key; `.name` is the Dart identifier the generator invented
  // (`assetClass` for `asset_class`), so keying a map off `.name` silently never matches.
  return switch (dimension.value) {
    'asset_class' => assetClassLabels[bucket] ?? bucket,
    'country' => _countryLabels[bucket] ?? bucket,
    _ => bucket,
  };
}

String dimensionLabel(AllocationDimension dimension) =>
    dimensionLabels[dimension.value] ?? dimension.value;

const periodLabels = {
  '1m': '1 мес',
  '3m': '3 мес',
  '6m': '6 мес',
  'ytd': 'С начала года',
  '1y': '1 год',
  '3y': '3 года',
  'all': 'Всё время',
};

String periodLabel(String period) => periodLabels[period] ?? period;

const eventKindLabels = {
  'buy': 'Покупка',
  'sell': 'Продажа',
  'dividend': 'Дивиденд',
  'coupon': 'Купон',
  'interest': 'Проценты',
  'tax': 'Налог',
  'tax_refund': 'Возврат налога',
  'commission': 'Комиссия',
  'deposit': 'Пополнение',
  'withdrawal': 'Вывод',
  'transfer_in': 'Ввод бумаг',
  'transfer_out': 'Вывод бумаг',
  'split': 'Сплит',
  'amortization': 'Амортизация',
  'repayment': 'Погашение',
  'fx_exchange': 'Конвертация',
  'other': 'Прочее',
};

String eventKindLabel(EventKind kind) =>
    eventKindLabels[kind.value] ?? kind.value;

/// `'0.1234'` as `'+12,34 %'`. Null becomes an em dash: a return nobody could compute is
/// not zero percent.
String formatPercent(String? value, {bool signed = true}) {
  if (value == null) return '—';
  final pct = (Decimal.parse(value).toDouble()) * 100;
  final sign = signed && pct > 0 ? '+' : '';
  return '$sign${pct.toStringAsFixed(2).replaceAll('.', ',')} %';
}

/// `'12,5'` for a quantity, trimming the NUMERIC(24,10) trailing zeros.
String formatQty(String value) {
  final d = Decimal.parse(value);
  final text = d == d.truncate() ? d.truncate().toString() : d.toString();
  return text.replaceAll('.', ',');
}

Color? signColor(BuildContext context, String? value) {
  if (value == null) return null;
  final d = Decimal.parse(value);
  if (d == Decimal.zero) return null;
  return d > Decimal.zero ? ChartColors.gain : ChartColors.loss;
}

/// The price-status chip every value on screen depends on: a stale price still produces a
/// number, a missing one produces nothing at all, and both must be visible.
class PriceStatusChip extends StatelessWidget {
  const PriceStatusChip({
    required this.status,
    required this.priceDate,
    super.key,
  });

  final String status;
  final DateTime? priceDate;

  @override
  Widget build(BuildContext context) {
    if (status == 'ok') return const SizedBox.shrink();
    final missing = status == 'missing';
    final scheme = Theme.of(context).colorScheme;
    final on = priceDate == null ? '' : ' от ${ruDate(priceDate!)}';
    return Tooltip(
      message: missing
          ? 'Нет цены — стоимость позиции неизвестна и не входит в итоги'
          : 'Цена$on устарела, оценка по последней известной',
      child: Icon(
        missing ? Icons.help_outline : Icons.schedule,
        size: 16,
        color: missing ? scheme.error : ChartColors.slot4Yellow,
      ),
    );
  }
}