import 'package:flutter/material.dart';

import 'package:pshared/controllers/balance_mask/wallets.dart';
import 'package:pshared/models/payment/wallet.dart';
import 'package:pshared/utils/currency.dart';

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


class SourceWalletSelector extends StatelessWidget {
  const SourceWalletSelector({
    super.key,
    required this.walletsController,
    this.isBusy = false,
    this.onChanged,
  });

  final WalletsController walletsController;
  final bool isBusy;
  final ValueChanged<Wallet>? onChanged;

  @override
  Widget build(BuildContext context) {
    final wallets = walletsController.wallets;
    final selectedWalletRef = walletsController.selectedWalletRef;
    final theme = Theme.of(context);
    final l10n = AppLocalizations.of(context)!;

    if (wallets.isEmpty) {
      return Text(l10n.noWalletsAvailable, style: theme.textTheme.bodySmall);
    }

    final effectiveSelectedWalletRef = selectedWalletRef != null &&
            wallets.any((wallet) => wallet.id == selectedWalletRef)
        ? selectedWalletRef
        : null;

    return DropdownButtonFormField<String>(
      initialValue: effectiveSelectedWalletRef,
      isExpanded: true,
      decoration: InputDecoration(
        labelText: l10n.whereGetMoney,
        border: const OutlineInputBorder(),
        contentPadding: const EdgeInsets.symmetric(
          horizontal: 12,
          vertical: 10,
        ),
      ),
      items: wallets
          .map(
            (wallet) => DropdownMenuItem<String>(
              value: wallet.id,
              child: Text(
                '${_walletLabel(wallet)} - ${currencyCodeToSymbol(wallet.currency)} ${amountToString(wallet.balance)}',
                overflow: TextOverflow.ellipsis,
              ),
            ),
          )
          .toList(growable: false),
      onChanged: isBusy
          ? null
          : (value) {
              if (value == null) return;
              walletsController.selectWalletByRef(value);
              final selected = walletsController.selectedWallet;
              if (selected != null) {
                onChanged?.call(selected);
              }
            },
    );
  }

  String _walletLabel(Wallet wallet) {
    final description = wallet.description?.trim();
    if (description != null && description.isNotEmpty) {
      return description;
    }
    final name = wallet.name.trim();
    if (name.isNotEmpty && !_looksLikeId(name)) {
      return name;
    }
    final token = wallet.tokenSymbol?.trim();
    if (token != null && token.isNotEmpty) {
      return '$token wallet';
    }
    return '${currencyCodeToString(wallet.currency)} wallet';
  }

  bool _looksLikeId(String value) {
    return RegExp(r'^[a-f0-9]{12,}$', caseSensitive: false)
        .hasMatch(value);
  }
}