import 'package:flutter/material.dart';

import 'package:pshared/models/money.dart';
import 'package:pshared/models/payment/payment.dart';
import 'package:pshared/models/payment/fx/quote.dart';
import 'package:pshared/utils/currency.dart';
import 'package:pshared/utils/money.dart';

import 'package:pweb/pages/report/details/section.dart';
import 'package:pweb/pages/report/details/sections/rows.dart';

import 'package:pweb/generated/i18n/app_localizations.dart';


class PaymentFxSection extends StatelessWidget {
  final Payment payment;

  const PaymentFxSection({super.key, required this.payment});

  @override
  Widget build(BuildContext context) {
    final loc = AppLocalizations.of(context)!;
    final fx = payment.lastQuote?.fxQuote;
    final rows = buildDetailRows([
      DetailValue(label: loc.fxRateLabel, value: _formatRate(fx)),
    ]);

    return DetailsSection(title: loc.paymentDetailsFx, children: rows);
  }

  String? _formatRate(FxQuote? fx) {
    if (fx == null) return null;
    final price = fx.price?.trim();
    if (price == null || price.isEmpty) return null;

    final baseCurrency = _firstNonEmpty([
      fx.baseCurrency,
      fx.baseAmount?.currency,
      currencySymbolFromCode(fx.baseCurrency),
      currencySymbolFromCode(fx.baseAmount?.currency),
    ]);
    final quoteCurrency = _firstNonEmpty([
      fx.quoteCurrency,
      fx.quoteAmount?.currency,
      currencySymbolFromCode(fx.quoteCurrency),
      currencySymbolFromCode(fx.quoteAmount?.currency),
    ]);

    if (baseCurrency == null || quoteCurrency == null) return price;

    final baseDisplay = formatMoneyDisplay(
      Money(amount: '1', currency: baseCurrency),
      fallback: '1 $baseCurrency',
      invalidAmountFallback: '1',
    );
    final quoteDisplay = formatMoneyDisplay(
      Money(amount: _normalizeAmount(price), currency: quoteCurrency),
      fallback: '$price $quoteCurrency',
      invalidAmountFallback: price,
    );

    return '$baseDisplay = $quoteDisplay';
  }

  String? _firstNonEmpty(List<String?> values) {
    for (final value in values) {
      final trimmed = value?.trim();
      if (trimmed != null && trimmed.isNotEmpty) return trimmed;
    }
    return null;
  }

  String _normalizeAmount(String raw) {
    return raw.replaceAll(RegExp(r'\s+'), '').replaceAll(',', '.');
  }
}