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

import '../../../core/design/tokens.dart';
import '../../../core/design/tripz_colors.dart';
import '../../../core/di.dart';
import '../../../core/l10n/l10n.dart';
import '../../../core/payments/payment_channels.dart';
import '../../../core/tenant/tenant_cubit.dart';
import '../../../core/ui/channel_picker.dart';
import '../../../core/ui/empty_view.dart';
import '../../../core/ui/status_banner.dart';
import '../../../core/ui/tripz_button.dart';
import '../../../core/ui/tripz_scaffold.dart';
import '../../../core/ui/tripz_sheet.dart';
import '../../../core/ui/tripz_text_field.dart';
import '../cubit/wallet_cubit.dart';
import '../cubit/wallet_state.dart';
import 'widgets/balance_card.dart';
import 'widgets/invoice_sheet.dart';
import 'widgets/txn_tile.dart';

/// محفظة الراكب — **رصيدٌ دفعه ولم يستهلكه**، أي التزامٌ على المنصّة.
/// شاشة السائق مختلفة عمداً (أرباح + سحب): لا تُوحَّدان (docs/39 §4).
class WalletPage extends StatefulWidget {
  const WalletPage({super.key});

  @override
  State<WalletPage> createState() => _WalletPageState();
}

class _WalletPageState extends State<WalletPage> {
  late final WalletCubit _cubit = sl<WalletCubit>()..load();

  @override
  void dispose() {
    _cubit.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final l10n = context.l10n;
    return BlocProvider.value(
      value: _cubit,
      child: BlocConsumer<WalletCubit, WalletState>(
        listenWhen: (p, n) => p.action != n.action,
        listener: (context, state) {
          if (state.action == WalletAction.topupFailed) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text(l10n.walletTopupFailed)),
            );
          }
          // الفاتورة تُعرض فور جهوزها: المستخدم يحتاج المرجع وحساب الاستلام
          // قبل أن يغادر التطبيق ليحوّل.
          final invoice = state.invoice;
          if (state.action == WalletAction.invoiceReady && invoice != null) {
            TripzSheet.show(context, child: InvoiceSheet(invoice: invoice));
          }
        },
        builder: (context, state) {
          return TripzScaffold(
            title: l10n.walletTitle,
            status: state.status,
            error: state.error,
            onRetry: _cubit.load,
            child: ListView(
              children: [
                BalanceCard(
                  label: l10n.walletBalance,
                  balance: state.wallet?.balance,
                  currency: state.currency,
                  action: TripzButton.primary(
                    label: l10n.walletTopup,
                    loading: state.action == WalletAction.toppingUp,
                    onPressed: () => _openTopup(context),
                  ),
                ),
                const SizedBox(height: Space.lg),
                Text(l10n.walletTransactions, style: context.texts.titleMedium),
                const SizedBox(height: Space.xs),
                if (state.transactions.isEmpty)
                  Padding(
                    padding: const EdgeInsets.only(top: Space.xl),
                    child: EmptyView(
                      icon: Icons.receipt_long_outlined,
                      message: l10n.walletEmpty,
                    ),
                  )
                else
                  for (final txn in state.transactions)
                    TxnTile(txn: txn, currency: state.currency),
              ],
            ),
          );
        },
      ),
    );
  }

  void _openTopup(BuildContext context) {
    final l10n = context.l10n;
    final controller = TextEditingController();
    // القنوات من حزمة دولة المستأجر لا من لغة الجهاز (docs/38 §10).
    final channels = PaymentChannel.forCountry(
      context.read<TenantCubit>().state.countryPack,
    );
    var channel = channels.first;

    TripzSheet.show(
      context,
      title: l10n.walletTopup,
      child: StatefulBuilder(
        builder: (context, setState) => Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            TripzTextField(
              controller: controller,
              label: l10n.walletTopupAmount,
              numeric: true,
              autofocus: true,
              keyboardType: const TextInputType.numberWithOptions(decimal: true),
            ),
            const SizedBox(height: Space.md),
            Text(l10n.walletChannel, style: context.texts.titleSmall),
            const SizedBox(height: Space.xs),
            ChannelPicker(
              channels: channels,
              selected: channel,
              onSelect: (c) => setState(() => channel = c),
            ),
            const SizedBox(height: Space.md),
            // الشحن ليس فورياً في قنوات الفاتورة — يُقال قبل الضغط لا بعده.
            if (channel != PaymentChannel.cash)
              StatusBanner(
                message: l10n.walletInvoicePending,
                tone: BannerTone.info,
                icon: Icons.schedule_rounded,
              ),
          ],
        ),
      ),
      bottomAction: TripzButton.primary(
        label: l10n.walletTopup,
        onPressed: () {
          final amount = num.tryParse(controller.text.trim());
          Navigator.of(context).pop();
          if (amount != null) {
            _cubit.topup(amount: amount, provider: channel.wire);
          }
        },
      ),
    );
  }
}