flutterApp/lib/features/main_container/domain/tab_config.dart

import 'package:equatable/equatable.dart';

class TabConfigItem extends Equatable {
  final String id;
  final String name;
  final String nameEn;
  final String icon;
  final bool isEnabled;
  final int order;

  const TabConfigItem({
    required this.id,
    required this.name,
    required this.nameEn,
    required this.icon,
    required this.isEnabled,
    required this.order,
  });

  TabConfigItem copyWith({
    String? id,
    String? name,
    String? nameEn,
    String? icon,
    bool? isEnabled,
    int? order,
  }) {
    return TabConfigItem(
      id: id ?? this.id,
      name: name ?? this.name,
      nameEn: nameEn ?? this.nameEn,
      icon: icon ?? this.icon,
      isEnabled: isEnabled ?? this.isEnabled,
      order: order ?? this.order,
    );
  }

  @override
  List<Object?> get props => [id, name, nameEn, icon, isEnabled, order];
}

class TabConfig extends Equatable {
  final List<TabConfigItem> items;

  const TabConfig({required this.items});

  List<TabConfigItem> get enabledItems {
    final enabled = items.where((item) => item.isEnabled).toList();
    enabled.sort((a, b) => a.order.compareTo(b.order));
    return enabled;
  }

  /// roleKey == 'personal'（个人角色）：底部导航与「系统设置 → Tab 设置」强制只保留
  /// 「设备(device) + 我的(me)」，且常显、开关锁定不可关闭；其他角色不受影响。
  static const String personalRoleKey = 'personal';
  static const Set<String> personalVisibleTabIds = {'device', 'me'};

  /// 底部导航实际渲染的 Tab：
  /// - personal：强制返回 设备 + 我的（忽略 isEnabled，恒为启用），按 order 排序
  /// - 其他角色：返回用户启用的 Tab（enabledItems）
  List<TabConfigItem> navItemsForRole(String? roleKey) {
    if (roleKey == personalRoleKey) {
      final forced = items
          .where((item) => personalVisibleTabIds.contains(item.id))
          .map((item) => item.copyWith(isEnabled: true))
          .toList();
      forced.sort((a, b) => a.order.compareTo(b.order));
      return forced;
    }
    return enabledItems;
  }

  /// 「Tab 设置」列表应展示的 Tab：
  /// - personal：只列出 设备 + 我的，按 order 排序
  /// - 其他角色：列出全部
  List<TabConfigItem> settingItemsForRole(String? roleKey) {
    if (roleKey == personalRoleKey) {
      final visible = items
          .where((item) => personalVisibleTabIds.contains(item.id))
          .toList();
      visible.sort((a, b) => a.order.compareTo(b.order));
      return visible;
    }
    return items;
  }

  TabConfig copyWith({List<TabConfigItem>? items}) {
    return TabConfig(items: items ?? this.items);
  }

  TabConfig toggleItem(String itemId) {
    final currentItem = items.firstWhere((item) => item.id == itemId);
    
    // 如果当前项是启用的，检查是否是最后一个启用的
    if (currentItem.isEnabled) {
      final enabledCount = items.where((item) => item.isEnabled).length;
      if (enabledCount <= 1) {
        // 至少保留一个 Tab，不允许关闭
        return this;
      }
    }
    
    final updatedItems = items.map((item) {
      if (item.id == itemId) {
        return item.copyWith(isEnabled: !item.isEnabled);
      }
      return item;
    }).toList();
    return copyWith(items: updatedItems);
  }

  static TabConfig defaultConfig() {
    return const TabConfig(
      items: [
        TabConfigItem(
          id: 'home_v2',
          name: '首页',
          nameEn: 'Home',
          icon: 'home_rounded',
          isEnabled: true,
          order: 1,
        ),
        TabConfigItem(
          id: 'device',
          name: '设备',
          nameEn: 'Device',
          icon: 'devices_rounded',
          isEnabled: true,
          order: 2,
        ),
        TabConfigItem(
          id: 'ai',
          name: 'AI',
          nameEn: 'AI',
          icon: 'auto_awesome_rounded',
          isEnabled: false,
          order: 3,
        ),
        TabConfigItem(
          id: 'warning',
          name: '告警',
          nameEn: 'Alerts',
          icon: 'warning_amber_rounded',
          isEnabled: true,
          order: 4,
        ),
        TabConfigItem(
          id: 'workorder',
          name: '工单',
          nameEn: 'WorkOrder',
          icon: 'assignment_rounded',
          isEnabled: true,
          order: 5,
        ),
        TabConfigItem(
          id: 'report',
          name: '上报',
          nameEn: 'Report',
          icon: 'post_add_rounded',
          isEnabled: true,
          order: 6,
        ),
        TabConfigItem(
          id: 'my',
          name: '旧我的',
          nameEn: 'Old Profile',
          icon: 'person_rounded',
          isEnabled: false,
          order: 7,
        ),
        TabConfigItem(
          id: 'me',
          name: '我的',
          nameEn: 'Profile',
          icon: 'person_rounded',
          isEnabled: true,
          order: 8,
        ),
      ],
    );
  }

  @override
  List<Object?> get props => [items];
}