import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.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/boxing_context.dart';
import 'package:pad_scanner/services/feedback_service.dart';
import 'package:pad_scanner/pages/boxing/boxing_api_actions.dart';
import 'package:pad_scanner/pages/boxing/boxing_box_mutations.dart'
    as box_mutations;
import 'package:pad_scanner/pages/boxing/boxing_calculations.dart'
    as boxing_calculations;
import 'package:pad_scanner/pages/boxing/boxing_models.dart';
import 'package:pad_scanner/pages/boxing/boxing_status_presenter.dart';
import 'package:pad_scanner/pages/boxing/dialogs/cross_paichan_dialog.dart';
import 'package:pad_scanner/pages/boxing/widgets/boxing_shared_widgets.dart';
import 'package:pad_scanner/pages/boxing/widgets/boxing_notice_banners.dart';
import 'package:pad_scanner/pages/boxing/widgets/multi_code_body.dart';
import 'package:pad_scanner/pages/boxing/widgets/single_code_body.dart';
import 'package:pad_scanner/pages/boxing_detail_page.dart';
import 'package:pad_scanner/widgets/status_bar.dart';

export 'package:pad_scanner/pages/boxing/boxing_models.dart'
    show BoxingMode, BoxingPageArguments;

// === 主页面 ===

class BoxingPage extends StatefulWidget {
  final BoxingPageArguments? arguments;

  const BoxingPage({super.key, this.arguments});

  @override
  State<BoxingPage> createState() => _BoxingPageState();
}

class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
  final _scannerService = ScannerService();
  final _apiService = ApiService();
  late final BoxingApiActions _apiActions;
  final _feedbackService = FeedbackService();
  final _focusNode = FocusNode();
  StreamSubscription<ScanResult>? _scanSubscription;

  // 模式
  BoxingMode _mode = BoxingMode.singleCode;

  // 阶段
  BoxingPhase _phase = BoxingPhase.waiting;

  // 当前总排号
  String? _zongpaiNo;

  // 排产号信息（来自后端查询）
  String? _paichanNo;
  String? _workOrderNo;
  int? _erpQuantity;
  List<CurrentZongpaiBoxData> _currentZongpaiBoxes = [];
  List<BoxDetailData> _existingBoxes = [];
  int _maxBoxNo = 0;

  // 输入
  final _boxNoController = TextEditingController();
  final _quantityController = TextEditingController();
  final _boxNoFocusNode = FocusNode();
  final _quantityFocusNode = FocusNode();

  // 多码凑箱：本次操作已确认装入当前箱的明细
  final _manyToOnePackedItems = <ManyToOnePackedItem>[];
  int? _editingPackedItemId;
  String _editingPackedQuantity = '';
  int? _deletingPackedItemId;
  int? _editingAssignedItemId;
  String _editingAssignedQuantity = '';
  int? _deletingAssignedItemId;
  String? _lastScannedPaichanNo;
  String? _paichanSwitchNotice;
  bool _crossPaichaPending = false;

  // 提交中
  bool _isSubmitting = false;

  CurrentZongpaiBoxData? _editingBox;

  // 重复箱号
  bool _isDuplicateBoxNo = false;

  // Status bar state
  StatusDotColor _statusDot = StatusDotColor.blue;
  String _statusText = '等待扫码';
  String? _statusOverrideText;
  StatusDotColor? _statusOverrideDot;
  bool _isAutoProcessing = false;
  final _autoWarnings = <String>[];

  // 多码凑箱：已完成装箱时可跳转的箱号
  int? _completedJumpBoxNo;

  @override
  void initState() {
    super.initState();
    _apiActions = BoxingApiActions(apiService: _apiService);
    WidgetsBinding.instance.addObserver(this);
    final arguments = widget.arguments;
    if (arguments != null) {
      _mode = arguments.initialMode;
    }
    _boxNoController.addListener(_onBoxNoTextChanged);
    _scanSubscription = _scannerService.scanResults.listen(_onScan);
    if (arguments != null && arguments.autoScanCodes.isNotEmpty) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        _processAutoScanCodes(arguments.autoScanCodes);
      });
    }
    WidgetsBinding.instance.addPostFrameCallback((_) => _requestFocus());
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _boxNoController.removeListener(_onBoxNoTextChanged);
    _scanSubscription?.cancel();
    _focusNode.dispose();
    _boxNoController.dispose();
    _quantityController.dispose();
    _boxNoFocusNode.dispose();
    _quantityFocusNode.dispose();
    _feedbackService.dispose();
    super.dispose();
  }

  void _requestFocus() {
    if (mounted) {
      _focusNode.requestFocus();
    }
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      _requestFocus();
    }
  }

  void _onKeyEvent(KeyEvent event) {
    if (event is! KeyDownEvent || _isAutoProcessing) return;
    if (_isModeSwitchKey(event)) {
      _cycleMode();
    }
    if (_isFinishBoxKey(event)) {
      final hasItems = _visibleManyToOnePackedItems.isNotEmpty;
      if (hasItems && _mode == BoxingMode.multiCode) {
        _finishManyToOneBox();
      }
    }
    if (_completedJumpBoxNo != null && _isJumpToBoxKey(event)) {
      _jumpToCompletedBox();
    }
  }

  bool _isModeSwitchKey(KeyEvent event) {
    final key = event.logicalKey;
    return key == LogicalKeyboardKey.select ||
        key == LogicalKeyboardKey.gameButtonRight1;
  }

  bool _isFinishBoxKey(KeyEvent event) {
    return event.logicalKey == LogicalKeyboardKey.gameButtonLeft2;
  }

  bool _isJumpToBoxKey(KeyEvent event) {
    return event.logicalKey == LogicalKeyboardKey.gameButtonRight2;
  }

  void _onBoxNoTextChanged() {
    if (!mounted || _mode != BoxingMode.multiCode) return;
    setState(() {
      _editingPackedItemId = null;
      _editingPackedQuantity = '';
      _deletingPackedItemId = null;
    });
  }

  // === 模式切换 ===

  String get _modeLabel {
    switch (_mode) {
      case BoxingMode.singleCode:
        return '单码装箱';
      case BoxingMode.multiCode:
        return '多码凑箱';
    }
  }

  void _cycleMode() {
    _feedbackService.trigger(FeedbackEvent.modeSwitch);
    setState(() {
      switch (_mode) {
        case BoxingMode.singleCode:
          _mode = BoxingMode.multiCode;
        case BoxingMode.multiCode:
          _mode = BoxingMode.singleCode;
      }
      _resetState();
    });
  }

  void _resetState() {
    _phase = BoxingPhase.waiting;
    _zongpaiNo = null;
    _paichanNo = null;
    _workOrderNo = null;
    _erpQuantity = null;
    _currentZongpaiBoxes = [];
    _existingBoxes = [];
    _maxBoxNo = 0;
    _boxNoController.clear();
    _quantityController.clear();
    _manyToOnePackedItems.clear();
    _editingPackedItemId = null;
    _editingPackedQuantity = '';
    _deletingPackedItemId = null;
    _editingAssignedItemId = null;
    _editingAssignedQuantity = '';
    _deletingAssignedItemId = null;
    _lastScannedPaichanNo = null;
    _paichanSwitchNotice = null;
    _crossPaichaPending = false;
    _isSubmitting = false;
    _editingBox = null;
    _isDuplicateBoxNo = false;
    _statusOverrideText = null;
    _statusOverrideDot = null;
  }

  // === 扫码处理 ===

  void _onScan(ScanResult result) {
    if (_isAutoProcessing) {
      return;
    }

    if (_crossPaichaPending) {
      _feedbackService.trigger(FeedbackEvent.alreadyCompleted);
      return;
    }

    final parsed = CodeParser.parse(result.barcode);

    if (parsed.type != CodeType.zongpaiNo) {
      _feedbackService.trigger(FeedbackEvent.scanInvalid);
      _showStatusOverride(
        '无效码，请重新扫描',
        StatusDotColor.red,
        const Duration(seconds: 2),
      );
      return;
    }

    final zongpai = parsed.value;

    // 三种模式都允许后扫入的总排号覆盖当前扫码区；未确认数据不会入库。
    _queryBoxInfo(zongpai);
  }

  Future<bool> _queryBoxInfo(String zongpai) async {
    final action = await _apiActions.fetchBoxInfo(zongpai);

    if (!mounted) return false;

    if (!action.success) {
      _feedbackService.trigger(switch (action.errorKind) {
        BoxingActionErrorKind.network => FeedbackEvent.networkError,
        BoxingActionErrorKind.missingApiUrl => FeedbackEvent.submitFailure,
        _ => FeedbackEvent.scanInvalid,
      });
      _showStatusOverride(
        action.errorMessage ?? '查询失败',
        _dotForActionError(action.errorKind),
        const Duration(seconds: 2),
      );
      return false;
    }

    final result = action.data!;
    // 判断该总牌号是否已全部装箱完毕
    final packedQuantity = result.currentZongpaiBoxes.fold<int>(
      0,
      (sum, item) => sum + item.quantity,
    );
    final totalQuantity = result.quantity ?? 0;
    final alreadyCompleted =
        totalQuantity > 0 && packedQuantity >= totalQuantity;

    _feedbackService.trigger(
      alreadyCompleted
          ? FeedbackEvent.alreadyCompleted
          : FeedbackEvent.scanValid,
    );

    setState(() {
      _zongpaiNo = zongpai;
      _paichanNo = result.paichanNo;
      _workOrderNo = result.workOrderNo;
      _erpQuantity = result.quantity;
      _currentZongpaiBoxes = result.currentZongpaiBoxes;
      _existingBoxes = result.existingBoxes;
      _maxBoxNo = result.maxBoxNo;
      _phase = BoxingPhase.scanned;
      _isDuplicateBoxNo = false;
      _editingBox = null;
      _editingAssignedItemId = null;
      _editingAssignedQuantity = '';
      _deletingAssignedItemId = null;
      _completedJumpBoxNo = null;
      _statusOverrideText = null;
      if (_mode == BoxingMode.singleCode) {
        _paichanSwitchNotice = null;
      }

      // 根据模式自动填充
      _applyAutoFill();
    });
    return true;
  }

  Future<void> _processAutoScanCodes(List<String> codes) async {
    if (!mounted) return;
    setState(() {
      _isAutoProcessing = true;
      _autoWarnings.clear();
      _statusOverrideText = '正在同步转运数据...';
      _statusOverrideDot = StatusDotColor.orange;
    });

    if (_mode == BoxingMode.singleCode) {
      final code = codes.first;
      final ok = await _queryBoxInfo(code);
      if (!ok && mounted) {
        setState(() => _autoWarnings.add('总排号 $code 未找到排产号信息，已忽略'));
      }
    } else {
      for (final code in codes) {
        if (!mounted) return;
        final queried = await _queryBoxInfo(code);
        if (!queried) {
          if (mounted) {
            setState(() => _autoWarnings.add('总排号 $code 未找到排产号信息，已忽略'));
          }
          continue;
        }
        if (!_canSubmit) {
          if (mounted) {
            setState(() => _autoWarnings.add('总排号 $code 暂不能装箱，已忽略'));
          }
          continue;
        }
        final saved = await _submit();
        if (!saved && mounted) {
          setState(() => _autoWarnings.add('总排号 $code 自动装箱失败，请手动处理'));
        }
      }
    }

    if (!mounted) return;
    setState(() {
      _isAutoProcessing = false;
      _statusOverrideText = null;
      _statusOverrideDot = null;
    });
    _focusQuantityInput();
    _requestFocus();
  }

  void _applyAutoFill() {
    switch (_mode) {
      case BoxingMode.singleCode:
        final remaining = _remainingQuantity;
        if (remaining <= 0) {
          _boxNoController.clear();
          _quantityController.clear();
          _statusOverrideText = '该总排号已全部装箱完毕';
          _statusOverrideDot = StatusDotColor.red;
          return;
        }
        _boxNoController.text = (_maxBoxNo + 1).toString();
        _quantityController.text = remaining.toString();
        _quantityController.selection = TextSelection(
          baseOffset: 0,
          extentOffset: _quantityController.text.length,
        );
        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (mounted && _mode == BoxingMode.singleCode) {
            _quantityFocusNode.requestFocus();
          }
        });
      case BoxingMode.multiCode:
        final decision = decideMultiCodePaichanContext(
          lastPaichanNo: _lastScannedPaichanNo,
          currentPaichanNo: _paichanNo,
          currentBoxNoText: _boxNoController.text,
          maxBoxNo: _maxBoxNo,
        );
        if (decision.isSwitched) {
          _crossPaichaPending = true;
          _feedbackService.trigger(FeedbackEvent.alreadyCompleted);
          _showCrossPaichaDialog();
          return;
        } else {
          _paichanSwitchNotice = null;
        }
        final boxNoToApply = decision.boxNoToApply;
        if (boxNoToApply != null) {
          _boxNoController.text = boxNoToApply.toString();
        }
        _lastScannedPaichanNo = _paichanNo;
        final remaining = _remainingQuantity;
        if (remaining <= 0) {
          _quantityController.clear();
          if (_manyToOnePackedItems.isEmpty &&
              _currentZongpaiBoxes.isNotEmpty) {
            _completedJumpBoxNo = _currentZongpaiBoxes.first.boxNo;
          }
          _statusOverrideText = '该总排号已全部装箱完毕';
          _statusOverrideDot = StatusDotColor.red;
          return;
        }
        _quantityController.text = remaining.toString();
        _quantityController.selection = TextSelection(
          baseOffset: 0,
          extentOffset: _quantityController.text.length,
        );
        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (mounted && _mode == BoxingMode.multiCode) {
            _quantityFocusNode.requestFocus();
          }
        });
    }
    _isDuplicateBoxNo = _boxNoIsDuplicate();
  }

  // === 跨排产号确认对话框 ===

  Future<void> _showCrossPaichaDialog() async {
    final currentPaicha = _lastScannedPaichanNo ?? '--';
    final newPaicha = _paichanNo ?? '--';
    final confirmed = await showCrossPaichanDialog(
      context: context,
      currentPaicha: currentPaicha,
      newPaicha: newPaicha,
    );
    if (!mounted) return;
    confirmed ? _confirmPaichanSwitch() : _cancelPaichanSwitch();
  }

  void _confirmPaichanSwitch() {
    setState(() {
      _crossPaichaPending = false;
      _manyToOnePackedItems.clear();
      _editingPackedItemId = null;
      _editingPackedQuantity = '';
      _deletingPackedItemId = null;
      _paichanSwitchNotice = '排产号已切换：${_paichanNo ?? "--"}';
      _boxNoController.text = (_maxBoxNo + 1).toString();
      _lastScannedPaichanNo = _paichanNo;
    });
    _feedbackService.trigger(FeedbackEvent.paichanSwitch);

    // Continue with remaining quantity flow
    final remaining = _remainingQuantity;
    if (remaining <= 0) {
      _quantityController.clear();
      if (_manyToOnePackedItems.isEmpty && _currentZongpaiBoxes.isNotEmpty) {
        _completedJumpBoxNo = _currentZongpaiBoxes.first.boxNo;
      }
      setState(() {
        _statusOverrideText = '该总排号已全部装箱完毕';
        _statusOverrideDot = StatusDotColor.red;
      });
      return;
    }
    setState(() {
      _quantityController.text = remaining.toString();
      _quantityController.selection = TextSelection(
        baseOffset: 0,
        extentOffset: _quantityController.text.length,
      );
      _isDuplicateBoxNo = _boxNoIsDuplicate();
    });
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted && _mode == BoxingMode.multiCode) {
        _quantityFocusNode.requestFocus();
      }
    });
  }

  void _cancelPaichanSwitch() {
    setState(() {
      _crossPaichaPending = false;
      _zongpaiNo = null;
      _paichanNo = _lastScannedPaichanNo;
      _phase = BoxingPhase.waiting;
    });
  }

  // === 重复箱号检测 ===

  bool _boxNoIsDuplicate() {
    return switch (_mode) {
      BoxingMode.multiCode => false,
      BoxingMode.singleCode => boxing_calculations.singleCodeBoxNoIsDuplicate(
        boxNoText: _boxNoController.text,
        currentBoxes: _currentZongpaiBoxes,
        editingBoxItemId: _editingBox?.boxItemId,
      ),
    };
  }

  void _checkDuplicateBoxNo() {
    setState(() => _isDuplicateBoxNo = _boxNoIsDuplicate());
  }

  // === 提交 ===

  int get _packedQuantity {
    return boxing_calculations.packedQuantity(_currentZongpaiBoxes);
  }

  int get _remainingQuantity {
    return boxing_calculations.remainingQuantity(
      totalQuantity: _erpQuantity,
      currentBoxes: _currentZongpaiBoxes,
    );
  }

  bool get _quantityTooHigh {
    return boxing_calculations.quantityTooHigh(
      remainingQuantity: _remainingQuantity,
      quantityText: _quantityController.text,
    );
  }

  bool get _canSubmit {
    return boxing_calculations.canSubmitBoxing(
      isSubmitting: _isSubmitting,
      phase: _phase,
      zongpaiNo: _zongpaiNo,
      boxNoText: _boxNoController.text,
      quantityText: _quantityController.text,
      remainingQuantity: _remainingQuantity,
      quantityTooHigh: _quantityTooHigh,
      isDuplicateBoxNo: _isDuplicateBoxNo,
    );
  }

  void _submitFromKeyboard() {
    if (_canSubmit) {
      _submit();
    }
  }

  void _focusQuantityInput() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (!mounted) return;
      _quantityFocusNode.requestFocus();
      _quantityController.selection = TextSelection(
        baseOffset: 0,
        extentOffset: _quantityController.text.length,
      );
    });
  }

  int? get _currentManyToOneBoxNo {
    return boxing_calculations.currentManyToOneBoxNo(_boxNoController.text);
  }

  List<ManyToOnePackedItem> get _visibleManyToOnePackedItems {
    return boxing_calculations.visibleManyToOnePackedItems(
      boxNo: _currentManyToOneBoxNo,
      existingBoxes: _existingBoxes,
      packedItems: _manyToOnePackedItems,
      paichanNo: _paichanNo,
    );
  }

  Future<bool> _submit() async {
    if (!_canSubmit) return false;

    final boxNo = int.parse(_boxNoController.text);
    final quantity = int.parse(_quantityController.text);

    setState(() => _isSubmitting = true);

    final editing = _editingBox;
    final action = editing == null
        ? await _apiActions.saveBoxRecord(
            zongpaiNo: _zongpaiNo!,
            boxNo: boxNo,
            quantity: quantity,
          )
        : await _apiActions.updateBoxRecord(
            boxItemId: editing.boxItemId,
            boxNo: boxNo,
            quantity: quantity,
          );

    if (!mounted) return false;

    setState(() => _isSubmitting = false);

    if (action.success) {
      if (editing == null) {
        _onSubmitSuccess(boxNo, quantity, action.data!.boxItemId);
      } else {
        _onUpdateSuccess(editing, boxNo, quantity);
      }
      return true;
    } else if (action.errorKind == BoxingActionErrorKind.duplicate) {
      _feedbackService.trigger(FeedbackEvent.duplicateBoxNo);
      _showStatusOverride(
        '该总排号在箱号 ${action.boxNo ?? ""} 已存在，请重新输入',
        StatusDotColor.amber,
        const Duration(seconds: 2),
      );
      return false;
    } else {
      _showActionError(action, fallback: '提交失败');
      return false;
    }
  }

  void _onSubmitSuccess(int boxNo, int quantity, int? boxItemId) {
    _feedbackService.trigger(FeedbackEvent.submitSuccess);

    setState(() {
      if (_mode == BoxingMode.singleCode && boxItemId != null) {
        _currentZongpaiBoxes = List.from(_currentZongpaiBoxes)
          ..add(
            CurrentZongpaiBoxData(
              boxItemId: boxItemId,
              boxNo: boxNo,
              quantity: quantity,
            ),
          );
      }
      _addExistingBoxItem(boxNo, quantity, boxItemId);
      _maxBoxNo = _maxBoxNo > boxNo ? _maxBoxNo : boxNo;
    });

    switch (_mode) {
      case BoxingMode.singleCode:
        final remaining = _remainingQuantity;
        if (remaining <= 0) {
          _showStatusOverride(
            '装箱成功',
            StatusDotColor.green,
            const Duration(milliseconds: 1500),
          );
        } else {
          setState(() {
            _phase = BoxingPhase.scanned;
            _boxNoController.text = (_maxBoxNo + 1).toString();
            _quantityController.text = remaining.toString();
            _quantityController.selection = TextSelection(
              baseOffset: 0,
              extentOffset: _quantityController.text.length,
            );
            _isDuplicateBoxNo = false;
          });
          _focusQuantityInput();
          _showStatusOverride(
            '请继续完成剩余数量装箱',
            StatusDotColor.green,
            const Duration(milliseconds: 1500),
          );
        }

      case BoxingMode.multiCode:
        _lastScannedPaichanNo = _paichanNo;
        setState(() {
          if (boxItemId != null) {
            _manyToOnePackedItems.add(
              ManyToOnePackedItem(
                boxItemId: boxItemId,
                zongpaiNo: _zongpaiNo!,
                paichanNo: _paichanNo,
                workOrderNo: _workOrderNo,
                boxNo: boxNo,
                quantity: quantity,
                totalQuantity: _erpQuantity,
              ),
            );
          }
          _phase = BoxingPhase.waiting;
          _zongpaiNo = null;
          _editingPackedItemId = null;
          _editingPackedQuantity = '';
          _deletingPackedItemId = null;
        });
        _showStatusOverride(
          '装箱成功，请继续扫码',
          StatusDotColor.green,
          const Duration(milliseconds: 1500),
        );
    }
  }

  void _onUpdateSuccess(
    CurrentZongpaiBoxData editing,
    int boxNo,
    int quantity,
  ) {
    _feedbackService.trigger(FeedbackEvent.submitSuccess);

    setState(() {
      _currentZongpaiBoxes = _currentZongpaiBoxes.map((item) {
        if (item.boxItemId != editing.boxItemId) return item;
        return CurrentZongpaiBoxData(
          boxItemId: item.boxItemId,
          boxNo: boxNo,
          quantity: quantity,
        );
      }).toList();
      _replaceExistingBoxItem(editing, boxNo, quantity);
      _editingBox = null;
      _boxNoController.text = (_maxBoxNo + 1).toString();
      final remaining = _remainingQuantity;
      if (remaining > 0) {
        _quantityController.text = remaining.toString();
      } else {
        _quantityController.clear();
      }
      _isDuplicateBoxNo = false;
    });
    _showStatusOverride(
      '修改成功',
      StatusDotColor.green,
      const Duration(milliseconds: 1500),
    );
  }

  void _replaceExistingBoxItem(
    CurrentZongpaiBoxData editing,
    int boxNo,
    int quantity,
  ) {
    final result = box_mutations.replaceExistingBoxItem(
      existingBoxes: _existingBoxes,
      editing: editing,
      boxNo: boxNo,
      quantity: quantity,
      zongpaiNo: _zongpaiNo!,
      workOrderNo: _workOrderNo,
      totalQuantity: _erpQuantity,
    );
    _existingBoxes = result.boxes;
    _maxBoxNo = result.maxBoxNo;
  }

  void _addExistingBoxItem(int boxNo, int quantity, int? boxItemId) {
    final result = box_mutations.addExistingBoxItem(
      existingBoxes: _existingBoxes,
      boxNo: boxNo,
      quantity: quantity,
      boxItemId: boxItemId,
      zongpaiNo: _zongpaiNo!,
      workOrderNo: _workOrderNo,
      totalQuantity: _erpQuantity,
    );
    _existingBoxes = result.boxes;
    _maxBoxNo = result.maxBoxNo;
  }

  void _finishManyToOneBox() {
    setState(() {
      _manyToOnePackedItems.clear();
      _editingPackedItemId = null;
      _editingPackedQuantity = '';
      _deletingPackedItemId = null;
      _zongpaiNo = null;
      _phase = BoxingPhase.waiting;
      _quantityController.clear();
      _boxNoController.text = (_maxBoxNo + 1).toString();
      _statusOverrideText = null;
      _statusOverrideDot = null;
    });
  }

  void _startEditAssigned(CurrentZongpaiBoxData item) {
    setState(() {
      _editingAssignedItemId = item.boxItemId;
      _editingAssignedQuantity = item.quantity.toString();
      _deletingAssignedItemId = null;
      _statusOverrideText = null;
      _statusOverrideDot = null;
    });
  }

  void _cancelEditAssigned() {
    setState(() {
      _editingAssignedItemId = null;
      _editingAssignedQuantity = '';
    });
  }

  int _maxAssignedQuantity(CurrentZongpaiBoxData item) {
    return boxing_calculations.maxAssignedQuantity(
      totalQuantity: _erpQuantity,
      packedQuantity: _packedQuantity,
      itemQuantity: item.quantity,
    );
  }

  void _refreshSingleCodeNewInput({bool focusQuantity = true}) {
    _boxNoController.text = (_maxBoxNo + 1).toString();
    final remaining = _remainingQuantity;
    if (remaining > 0) {
      _quantityController.text = remaining.toString();
      _quantityController.selection = TextSelection(
        baseOffset: 0,
        extentOffset: _quantityController.text.length,
      );
      if (focusQuantity) {
        _focusQuantityInput();
      }
    } else {
      _quantityController.clear();
    }
    _isDuplicateBoxNo = false;
  }

  Future<void> _saveAssignedItem(CurrentZongpaiBoxData item) async {
    final quantity = int.tryParse(_editingAssignedQuantity);
    if (quantity == null || quantity <= 0) {
      _showStatusOverride(
        '请输入有效数量',
        StatusDotColor.red,
        const Duration(seconds: 2),
      );
      return;
    }
    if (quantity > _maxAssignedQuantity(item)) {
      _showStatusOverride(
        '超出可装数量上限',
        StatusDotColor.red,
        const Duration(seconds: 2),
      );
      return;
    }

    setState(() => _isSubmitting = true);
    final action = await _apiActions.updateBoxRecord(
      boxItemId: item.boxItemId,
      boxNo: item.boxNo,
      quantity: quantity,
    );
    if (!mounted) return;

    setState(() => _isSubmitting = false);
    if (action.success) {
      setState(() {
        _currentZongpaiBoxes = _currentZongpaiBoxes.map((box) {
          if (box.boxItemId != item.boxItemId) return box;
          return CurrentZongpaiBoxData(
            boxItemId: box.boxItemId,
            boxNo: box.boxNo,
            quantity: quantity,
          );
        }).toList();
        _replaceExistingBoxItem(item, item.boxNo, quantity);
        _editingAssignedItemId = null;
        _editingAssignedQuantity = '';
        _refreshSingleCodeNewInput();
      });
      _showStatusOverride(
        '修改成功',
        StatusDotColor.green,
        const Duration(milliseconds: 1500),
      );
    } else {
      _showActionError(action, fallback: '修改失败');
    }
  }

  Future<void> _deleteAssignedItem(CurrentZongpaiBoxData item) async {
    setState(() => _isSubmitting = true);
    final action = await _apiActions.deleteBoxRecord(boxItemId: item.boxItemId);
    if (!mounted) return;

    setState(() {
      _isSubmitting = false;
      if (action.success) {
        _currentZongpaiBoxes = _currentZongpaiBoxes
            .where((box) => box.boxItemId != item.boxItemId)
            .toList();
        _removeExistingBoxItem(item.boxItemId);
        if (_editingAssignedItemId == item.boxItemId) {
          _editingAssignedItemId = null;
          _editingAssignedQuantity = '';
        }
        _deletingAssignedItemId = null;
        _refreshSingleCodeNewInput();
      }
    });

    if (action.success) {
      _showStatusOverride(
        '删除成功',
        StatusDotColor.green,
        const Duration(milliseconds: 1500),
      );
    } else {
      _showActionError(action, fallback: '删除失败');
    }
  }

  void _startEditPackedItem(ManyToOnePackedItem item) {
    setState(() {
      _editingPackedItemId = item.boxItemId;
      _editingPackedQuantity = item.quantity.toString();
      _deletingPackedItemId = null;
    });
  }

  void _cancelEditPackedItem() {
    setState(() {
      _editingPackedItemId = null;
      _editingPackedQuantity = '';
    });
  }

  Future<void> _savePackedItem(ManyToOnePackedItem item) async {
    final quantity = int.tryParse(_editingPackedQuantity);
    final boxNo = int.tryParse(_boxNoController.text.trim());
    if (quantity == null || quantity <= 0 || boxNo == null || boxNo <= 0) {
      _showStatusOverride(
        '请输入有效箱号和数量',
        StatusDotColor.red,
        const Duration(seconds: 2),
      );
      return;
    }

    setState(() => _isSubmitting = true);
    final action = await _apiActions.updateBoxRecord(
      boxItemId: item.boxItemId,
      boxNo: boxNo,
      quantity: quantity,
    );
    if (!mounted) return;

    setState(() => _isSubmitting = false);
    if (action.success) {
      setState(() {
        final index = _manyToOnePackedItems.indexWhere(
          (packed) => packed.boxItemId == item.boxItemId,
        );
        if (index >= 0) {
          _manyToOnePackedItems[index] = _manyToOnePackedItems[index].copyWith(
            boxNo: boxNo,
            quantity: quantity,
          );
        }
        _replaceExistingPackedItem(item, boxNo, quantity);
        _editingPackedItemId = null;
        _editingPackedQuantity = '';
      });
      _showStatusOverride(
        '修改成功',
        StatusDotColor.green,
        const Duration(milliseconds: 1500),
      );
    } else {
      _showActionError(action, fallback: '修改失败');
    }
  }

  void _replaceExistingPackedItem(
    ManyToOnePackedItem item,
    int boxNo,
    int quantity,
  ) {
    final result = box_mutations.replaceExistingPackedItem(
      existingBoxes: _existingBoxes,
      item: item,
      boxNo: boxNo,
      quantity: quantity,
    );
    _existingBoxes = result.boxes;
    _maxBoxNo = result.maxBoxNo;
  }

  Future<void> _deletePackedItem(ManyToOnePackedItem item) async {
    setState(() => _isSubmitting = true);
    final action = await _apiActions.deleteBoxRecord(boxItemId: item.boxItemId);
    if (!mounted) return;

    setState(() {
      _isSubmitting = false;
      if (action.success) {
        _manyToOnePackedItems.removeWhere(
          (packed) => packed.boxItemId == item.boxItemId,
        );
        _removeExistingBoxItem(item.boxItemId);
        if (_editingPackedItemId == item.boxItemId) {
          _editingPackedItemId = null;
          _editingPackedQuantity = '';
        }
        _deletingPackedItemId = null;
      }
    });

    if (action.success) {
      _showStatusOverride(
        '删除成功',
        StatusDotColor.green,
        const Duration(milliseconds: 1500),
      );
    } else {
      _showActionError(action, fallback: '删除失败');
    }
  }

  void _removeExistingBoxItem(int boxItemId) {
    final result = box_mutations.removeExistingBoxItem(
      existingBoxes: _existingBoxes,
      boxItemId: boxItemId,
    );
    _existingBoxes = result.boxes;
    _maxBoxNo = result.maxBoxNo;
  }

  // === Status bar management ===

  StatusDotColor _dotForActionError(BoxingActionErrorKind? kind) {
    return switch (kind) {
      BoxingActionErrorKind.network => StatusDotColor.yellow,
      BoxingActionErrorKind.duplicate => StatusDotColor.amber,
      _ => StatusDotColor.red,
    };
  }

  void _showActionError<T>(
    BoxingActionResult<T> action, {
    required String fallback,
  }) {
    _feedbackService.trigger(switch (action.errorKind) {
      BoxingActionErrorKind.network => FeedbackEvent.networkError,
      BoxingActionErrorKind.duplicate => FeedbackEvent.duplicateBoxNo,
      _ => FeedbackEvent.submitFailure,
    });
    _showStatusOverride(
      action.errorMessage ?? fallback,
      _dotForActionError(action.errorKind),
      const Duration(seconds: 2),
    );
  }

  void _showStatusOverride(String text, StatusDotColor dot, Duration duration) {
    setState(() {
      _statusOverrideText = text;
      _statusOverrideDot = dot;
    });
    Future.delayed(duration, () {
      if (mounted) {
        setState(() {
          _statusOverrideText = null;
          _statusOverrideDot = null;
        });
      }
    });
  }

  void _jumpToCompletedBox() {
    final boxNo = _completedJumpBoxNo;
    if (boxNo == null) return;
    setState(() {
      _boxNoController.text = boxNo.toString();
      _completedJumpBoxNo = null;
      _statusOverrideText = null;
      _statusOverrideDot = null;
    });
  }

  // === 导航到详情页 ===

  void _openDetail() {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (_) => BoxingDetailPage(
          paichanNo: _paichanNo ?? '',
          existingBoxes: _existingBoxes,
        ),
      ),
    );
  }

  // === 状态文字 ===

  void _updateBaseStatus() {
    final status = boxingStatusFor(
      isAutoProcessing: _isAutoProcessing,
      isSubmitting: _isSubmitting,
      isDuplicateBoxNo: _isDuplicateBoxNo,
      quantityTooHigh: _quantityTooHigh,
      isEditingAssigned: _editingAssignedItemId != null,
      isDeletingAssigned: _deletingAssignedItemId != null,
      hasPaichanSwitchNotice: _paichanSwitchNotice != null,
      phase: _phase,
      isMultiCode: _mode == BoxingMode.multiCode,
      hasVisibleManyToOneItems: _visibleManyToOnePackedItems.isNotEmpty,
      remainingQuantity: _remainingQuantity,
      boxNoText: _boxNoController.text,
    );
    _statusDot = status.dot;
    _statusText = status.text;
  }

  // === Build ===

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

    return KeyboardListener(
      focusNode: _focusNode,
      onKeyEvent: _onKeyEvent,
      child: Scaffold(
        appBar: AppBar(
          title: Row(
            children: [
              const Text('装箱编号'),
              const SizedBox(width: 8),
              BoxingModePill(
                isSingle: _mode == BoxingMode.singleCode,
                label: _modeLabel,
                enabled: !_isAutoProcessing,
                onTap: _cycleMode,
              ),
            ],
          ),
          toolbarHeight: 44,
          titleSpacing: 12,
        ),
        body: Column(
          children: [
            BoxingNoticeBanners(
              isAutoProcessing: _isAutoProcessing,
              autoWarnings: _autoWarnings,
              paichanSwitchNotice: _paichanSwitchNotice,
              isDuplicateBoxNo: _isDuplicateBoxNo,
              quantityTooHigh: _quantityTooHigh,
              phase: _phase,
              boxNoText: _boxNoController.text,
              remainingQuantity: _remainingQuantity,
              zongpaiNo: _zongpaiNo,
              completedJumpBoxNo: _completedJumpBoxNo,
              onJumpToCompletedBox: _jumpToCompletedBox,
            ),

            Expanded(
              child: _mode == BoxingMode.multiCode
                  ? MultiCodeBody(
                      hasScan:
                          _zongpaiNo != null && _phase == BoxingPhase.scanned,
                      zongpaiNo: _zongpaiNo,
                      paichanNo: _paichanNo,
                      workOrderNo: _workOrderNo,
                      erpQuantity: _erpQuantity,
                      maxBoxNo: _maxBoxNo,
                      existingBoxes: _existingBoxes,
                      visibleItems: _visibleManyToOnePackedItems,
                      boxNoController: _boxNoController,
                      quantityController: _quantityController,
                      boxNoFocusNode: _boxNoFocusNode,
                      quantityFocusNode: _quantityFocusNode,
                      isSubmitting: _isSubmitting,
                      quantityTooHigh: _quantityTooHigh,
                      canSubmit: _canSubmit,
                      editingPackedItemId: _editingPackedItemId,
                      editingPackedQuantity: _editingPackedQuantity,
                      deletingPackedItemId: _deletingPackedItemId,
                      onOpenDetail: _openDetail,
                      onSubmitFromKeyboard: _submitFromKeyboard,
                      onSubmit: _submit,
                      onQuantityChanged: () => setState(() {}),
                      onFinishBox: _finishManyToOneBox,
                      onEditingPackedQuantityChanged: (value) =>
                          _editingPackedQuantity = value,
                      onSavePackedItem: _savePackedItem,
                      onCancelEditPackedItem: _cancelEditPackedItem,
                      onStartEditPackedItem: _startEditPackedItem,
                      onStartDeletePackedItem: (item) {
                        setState(() {
                          _deletingPackedItemId = item.boxItemId;
                          _editingPackedItemId = null;
                          _editingPackedQuantity = '';
                        });
                      },
                      onDeletePackedItem: _deletePackedItem,
                      onCancelDeletePackedItem: () =>
                          setState(() => _deletingPackedItemId = null),
                    )
                  : SingleCodeBody(
                      isWaiting:
                          _phase == BoxingPhase.waiting && _zongpaiNo == null,
                      isFinished:
                          _phase == BoxingPhase.scanned &&
                          _zongpaiNo != null &&
                          _remainingQuantity <= 0,
                      zongpaiNo: _zongpaiNo,
                      paichanNo: _paichanNo,
                      workOrderNo: _workOrderNo,
                      erpQuantity: _erpQuantity,
                      packedQuantity: _packedQuantity,
                      maxBoxNo: _maxBoxNo,
                      assignedItems: _currentZongpaiBoxes,
                      existingBoxes: _existingBoxes,
                      boxNoController: _boxNoController,
                      quantityController: _quantityController,
                      boxNoFocusNode: _boxNoFocusNode,
                      quantityFocusNode: _quantityFocusNode,
                      isSubmitting: _isSubmitting,
                      isDuplicateBoxNo: _isDuplicateBoxNo,
                      quantityTooHigh: _quantityTooHigh,
                      canSubmit: _canSubmit,
                      editingAssignedItemId: _editingAssignedItemId,
                      editingAssignedQuantity: _editingAssignedQuantity,
                      deletingAssignedItemId: _deletingAssignedItemId,
                      onOpenDetail: _openDetail,
                      onCheckDuplicateBoxNo: _checkDuplicateBoxNo,
                      onSubmitFromKeyboard: _submitFromKeyboard,
                      onSubmit: _submit,
                      onQuantityChanged: () => setState(() {}),
                      onEditingAssignedQuantityChanged: (value) =>
                          _editingAssignedQuantity = value,
                      onSaveAssignedItem: _saveAssignedItem,
                      onCancelEditAssigned: _cancelEditAssigned,
                      onStartEditAssigned: _startEditAssigned,
                      onStartDeleteAssigned: (item) {
                        setState(() {
                          _deletingAssignedItemId = item.boxItemId;
                          _editingAssignedItemId = null;
                          _editingAssignedQuantity = '';
                        });
                      },
                      onDeleteAssignedItem: _deleteAssignedItem,
                      onCancelDeleteAssigned: () =>
                          setState(() => _deletingAssignedItemId = null),
                    ),
            ),

            // 底部状态栏
            StatusBar(dotColor: effectiveDot, text: effectiveText),
          ],
        ),
      ),
    );
  }
}