import 'package:auto_route/auto_route.dart';
import 'package:flutter/material.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';

import '../../../../common/theme/theme.dart';
import '../../../../domain/wallet/wallet.dart';
import '../../../router/app_router.gr.dart';
import '../../wallet/wallet_ui.dart';
import 'pin_code_field.dart';

/// Mengirim PIN ke server. Kembalikan `null` bila sukses, atau failure-nya.
typedef PinSubmitCallback = Future<WalletFailure?> Function(String pin);

enum _PinSheetResult { success, failed, forgotPin, pinNotSet }

/// Meminta PIN lalu menjalankan [onSubmit]. Error PIN (§6.5) ditangani di dalam
/// sheet; failure lain menutup sheet dan ditampilkan oleh halaman pemanggil.
/// Mengembalikan `true` bila [onSubmit] sukses.
Future<bool> showPinSheet(
  BuildContext context, {
  required String title,
  String? subtitle,
  required PinSubmitCallback onSubmit,
}) async {
  final result = await showModalBottomSheet<_PinSheetResult>(
    context: context,
    isScrollControlled: true,
    isDismissible: false,
    backgroundColor: AppColor.white,
    shape: const RoundedRectangleBorder(
      borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
    ),
    builder: (_) =>
        _PinSheet(title: title, subtitle: subtitle, onSubmit: onSubmit),
  );

  if (!context.mounted) return false;

  switch (result) {
    case _PinSheetResult.success:
      return true;
    case _PinSheetResult.forgotPin:
      context.router.push(PinSetupRoute(purpose: PinOtpPurpose.reset));
      return false;
    case _PinSheetResult.pinNotSet:
      context.router.push(PinSetupRoute(purpose: PinOtpPurpose.setup));
      return false;
    case _PinSheetResult.failed:
    case null:
      return false;
  }
}

class _PinSheet extends StatefulWidget {
  const _PinSheet({required this.title, this.subtitle, required this.onSubmit});

  final String title;
  final String? subtitle;
  final PinSubmitCallback onSubmit;

  @override
  State<_PinSheet> createState() => _PinSheetState();
}

class _PinSheetState extends State<_PinSheet> {
  final TextEditingController _controller = TextEditingController();

  bool _isSubmitting = false;
  String? _errorText;

  /// PIN terkunci atau transfer ditahan: input tidak berguna lagi.
  bool _isBlocked = false;

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  Future<void> _submit(String pin) async {
    if (_isSubmitting || _isBlocked) return;
    setState(() {
      _isSubmitting = true;
      _errorText = null;
    });

    final failure = await widget.onSubmit(pin);
    if (!mounted) return;

    // PIN tidak disimpan lebih lama dari yang diperlukan.
    _controller.clear();

    if (failure == null) {
      Navigator.of(context).pop(_PinSheetResult.success);
      return;
    }

    final handled = failure.maybeMap(
      pinNotSet: (_) {
        Navigator.of(context).pop(_PinSheetResult.pinNotSet);
        return true;
      },
      pinInvalid: (_) {
        setState(() => _errorText = walletFailureMessage(failure));
        return true;
      },
      pinLocked: (_) {
        setState(() {
          _errorText = walletFailureMessage(failure);
          _isBlocked = true;
        });
        return true;
      },
      transferBlocked: (_) {
        setState(() {
          _errorText = walletFailureMessage(failure);
          _isBlocked = true;
        });
        return true;
      },
      orElse: () => false,
    );

    if (!handled) {
      Navigator.of(context).pop(_PinSheetResult.failed);
      return;
    }

    setState(() => _isSubmitting = false);
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.only(
        left: 20,
        right: 20,
        top: 12,
        bottom: MediaQuery.of(context).viewInsets.bottom + 24,
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Expanded(
                child: Text(
                  widget.title,
                  style: AppStyle.xl.copyWith(fontWeight: FontWeight.w700),
                ),
              ),
              IconButton(
                onPressed: _isSubmitting
                    ? null
                    : () => Navigator.of(context).pop(),
                icon: const Icon(Icons.close, color: AppColor.textSecondary),
              ),
            ],
          ),
          Text(
            widget.subtitle ?? 'Masukkan PIN 6 digit kamu',
            style: AppStyle.md.copyWith(color: AppColor.textSecondary),
          ),
          const SizedBox(height: 24),
          PinCodeField(
            controller: _controller,
            enabled: !_isSubmitting && !_isBlocked,
            hasError: _errorText != null,
            onCompleted: _submit,
          ),
          const SizedBox(height: 16),
          if (_isSubmitting)
            const Center(
              child: SpinKitFadingCircle(color: AppColor.primary, size: 28),
            )
          else if (_errorText != null)
            Text(
              _errorText!,
              style: AppStyle.md.copyWith(
                color: AppColor.error,
                fontWeight: FontWeight.w600,
              ),
            ),
          const SizedBox(height: 8),
          Align(
            alignment: Alignment.centerRight,
            child: TextButton(
              onPressed: _isSubmitting
                  ? null
                  : () => Navigator.of(context).pop(_PinSheetResult.forgotPin),
              child: Text(
                'Lupa PIN',
                style: AppStyle.md.copyWith(
                  color: AppColor.primary,
                  fontWeight: FontWeight.w700,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}