import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:pad_scanner/services/app_config_service.dart';
import 'package:pad_scanner/services/scanner_service.dart';
import 'package:pad_scanner/services/code_parser.dart';
import 'package:pad_scanner/services/api_service.dart';
import 'package:pad_scanner/services/feedback_service.dart';
import 'package:pad_scanner/services/registration_linking.dart';
import 'package:vibration/vibration.dart';
import 'package:pad_scanner/pages/boxing_page.dart';
import 'package:pad_scanner/widgets/status_bar.dart';
import 'package:pad_scanner/pages/boxing/widgets/boxing_shared_widgets.dart';
import 'package:pad_scanner/pages/registration/registration_calculations.dart'
    as registration_calculations;

part 'registration/parts/registration_scan_part.dart';
part 'registration/parts/registration_status_part.dart';
part 'registration/parts/registration_overview_part.dart';
part 'registration/parts/registration_submit_part.dart';
part 'registration/parts/registration_mode_part.dart';
part 'registration/dialogs/registration_dialogs_part.dart';
part 'registration/widgets/registration_widgets_part.dart';

enum RegistrationMode {
  singleCode, // 单码上架
  multiCode, // 多码上架
}

class RegistrationPage extends StatefulWidget {
  const RegistrationPage({super.key});

  @override
  State<RegistrationPage> createState() => _RegistrationPageState();
}

class _RegistrationPageState extends State<RegistrationPage> {
  final _scannerService = ScannerService();
  final _apiService = ApiService();
  final _feedbackService = FeedbackService();
  final _focusNode = FocusNode();

  StreamSubscription<ScanResult>? _scanSubscription;
  final _zongpaiNos = <String>[];
  String? _locationCode;
  CodeType? _locationType;
  RegistrationMode _mode = RegistrationMode.singleCode;
  bool _isSubmitting = false;

  StatusDotColor _statusDot = StatusDotColor.blue;
  String _statusText = '等待扫描总排号或货位号…';
  String? _statusOverrideText;
  StatusDotColor? _statusOverrideDot;

  bool _overviewLoading = false;
  bool _overviewNotFound = false;
  String? _overviewError;
  String? _overviewZongpaiNo;
  PaichaOverviewResult? _overview;
  int _overviewRequestId = 0;

  /// Whether a cross-paicha warning dialog is currently showing.
  bool _crossPaichaPending = false;

  @override
  void initState() {
    super.initState();
    _startScanListening();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _focusNode.requestFocus();
    });
  }

  @override
  void dispose() {
    _scanSubscription?.cancel();
    _focusNode.dispose();
    _feedbackService.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    _updateBaseStatus();
    final effectiveDot = _statusOverrideDot ?? _statusDot;
    final effectiveText = _statusOverrideText ?? _statusText;

    return KeyboardListener(
      focusNode: _focusNode,
      onKeyEvent: _onKeyEvent,
      child: Scaffold(
        appBar: AppBar(
          title: Row(
            children: [
              const Text('上架登记'),
              const SizedBox(width: 12),
              Expanded(child: _buildModePill()),
            ],
          ),
          titleSpacing: 12,
        ),
        body: Column(
          children: [
            _buildPaichaHeader(),
            if (_overview?.success == true) _buildTableHead(),
            Expanded(child: _buildListBody()),
            _buildBottomBar(colorScheme),
            StatusBar(dotColor: effectiveDot, text: effectiveText),
          ],
        ),
      ),
    );
  }
}