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

import '../../core/utils/ru_date.dart';
import '../../core/widgets/money_text.dart';

/// The amount/currency/RUB-equivalent a transaction is shown with, chosen by
/// its [FlowType]: the outgoing leg for expenses and transfers out, the
/// incoming leg for income.
({String amount, String currency, String? rub}) primaryAmount(
  TransactionOut t,
) {
  switch (t.flowType) {
    case FlowType.income:
      return (
        amount: t.income,
        currency: t.incomeCurrency ?? 'RUB',
        rub: t.incomeRub,
      );
    case FlowType.expense:
      return (
        amount: t.outcome,
        currency: t.outcomeCurrency ?? 'RUB',
        rub: t.outcomeRub,
      );
    case FlowType.internalTransfer:
    case FlowType.savingsTransfer:
    case FlowType.brokerExternalFlow:
    case FlowType.other:
    case FlowType.deleted:
    case FlowType.unknownDefaultOpenApi:
      if (t.outcome != '0' && t.outcomeCurrency != null) {
        return (
          amount: t.outcome,
          currency: t.outcomeCurrency!,
          rub: t.outcomeRub,
        );
      }
      return (
        amount: t.income,
        currency: t.incomeCurrency ?? 'RUB',
        rub: t.incomeRub,
      );
  }
}

(IconData, Color) flowTypeIcon(FlowType type, ColorScheme scheme) =>
    switch (type) {
      FlowType.income => (Icons.arrow_circle_down_outlined, Colors.green),
      FlowType.expense => (Icons.arrow_circle_up_outlined, scheme.error),
      FlowType.internalTransfer => (Icons.swap_horiz, scheme.primary),
      FlowType.savingsTransfer => (
        Icons.savings_outlined,
        Colors.amber.shade800,
      ),
      FlowType.brokerExternalFlow => (Icons.trending_up, Colors.deepPurple),
      FlowType.other ||
      FlowType.deleted ||
      FlowType.unknownDefaultOpenApi => (Icons.help_outline, scheme.outline),
    };

/// One row of the Операции list: date, payee, category, native amount with
/// its RUB equivalent when the currency differs, and a flow-type icon.
class TransactionRow extends StatelessWidget {
  const TransactionRow({
    required this.transaction,
    required this.categoryName,
    required this.onTap,
    super.key,
  });

  final TransactionOut transaction;
  final String? categoryName;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final t = transaction;
    final scheme = Theme.of(context).colorScheme;
    final (icon, color) = flowTypeIcon(t.flowType, scheme);
    final amount = primaryAmount(t);
    final showRub = amount.currency != 'RUB' && amount.rub != null;
    final payee = t.payeeCanonical?.isNotEmpty == true
        ? t.payeeCanonical!
        : (t.payee ?? '—');

    return ListTile(
      onTap: onTap,
      leading: Icon(icon, color: color),
      title: Text(payee),
      subtitle: Text([ruDate(t.date), ?categoryName].join(' · ')),
      trailing: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.end,
        children: [
          MoneyText(amount.amount, currency: amount.currency),
          if (showRub)
            Text(
              MoneyText.format(amount.rub!, 'RUB'),
              style: Theme.of(context).textTheme.bodySmall
                  ?.copyWith(color: scheme.outline),
            ),
        ],
      ),
    );
  }
}