import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../../../models/org_node.dart';
import '../../../models/sys_role.dart';
import '../../../models/sys_user.dart';
import '../../../providers/auth_provider.dart';
import '../../../services/api_client.dart';
import '../../../services/org_service.dart';
import '../../../services/sys_service.dart';
import '../../../utils/credential_storage.dart';
import '../../../utils/i10n.dart';
import '../../../utils/session_org_scope.dart';
import '../../../widgets/org_picker_sheet.dart';

/// 用户管理页。
class UserPage extends ConsumerStatefulWidget {
  const UserPage({super.key});

  @override
  ConsumerState<UserPage> createState() => _UserPageState();
}

class _UserPageState extends ConsumerState<UserPage> {
  final SystemService _service = SystemService();

  final List<SysUser> _items = [];
  bool _loading = false;
  int _page = 1;
  bool _hasMore = true;
  String? _error;

  final TextEditingController _searchController = TextEditingController();
  String _searchKeyword = '';

  List<SysRole> _roles = [];
  bool _rolesLoaded = false;

  List<OrgNode> _orgNodes = [];
  final Map<String, String> _orgNameMap = {};
  /// orgId -> 组织类型（0=平台 1=渠道 2=代理商 3=门店 4=设备分组），
  /// 用于「角色」字段在角色名缺失时回退展示组织类型，而非裸数字 roleId。
  final Map<String, int> _orgTypeMap = {};

  final ScrollController _scrollController = ScrollController();
  final int _limit = 20;

  /// 当前账号密码是否明文展示（仅在无下级账号时展示自身密码）。
  bool _showOwnPassword = false;

  /// 当前选中的组织（门店/渠道商）筛选值，null 表示全部。
  String? _selectedOrgId;

  /// 当前登录用户组织范围内的全部组织 ID（用于客户端二次收敛用户列表）。
  /// 仅在 [SessionOrgScope] 启用时填充；为 null 表示尚未加载。
  Set<String>? _scopeOrgIds;

  @override
  void initState() {
    super.initState();
    _scrollController.addListener(_onScroll);
    _loadRoles();
    _loadOrgs();
    _loadData();
  }

  @override
  void dispose() {
    _searchController.dispose();
    _scrollController.removeListener(_onScroll);
    _scrollController.dispose();
    super.dispose();
  }

  void _onScroll() {
    if (_scrollController.position.pixels >=
        _scrollController.position.maxScrollExtent - 200) {
      _loadMore();
    }
  }

  Future<void> _loadRoles() async {
    final t = AppLocalizations.of(context);
    try {
      // 优先用 /sys/role/select；不存在时回退到 /sys/role/list。
      _roles = await _service.getRoleSelect();
      if (_roles.isEmpty) {
        _roles = await _service.getRoleList(limit: 1000);
      }
    } catch (e) {
      // 下拉接口失败时尝试分页接口。
      try {
        _roles = await _service.getRoleList(limit: 1000);
      } catch (_) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text(t.rolesLoadFailed)),
          );
        }
      }
    } finally {
      _rolesLoaded = true;
      if (mounted) setState(() {});
    }
  }

  Future<void> _loadOrgs() async {
    // 优先取组织树，保留层级关系；失败时回退到扁平列表。
    Future<List<OrgNode>> fetch() async {
      try {
        final tree = await OrgService().getOrgTree();
        if (tree.isNotEmpty) return tree;
      } catch (_) {}
      try {
        final flat = await OrgService().getOrgFlatList();
        if (flat.isNotEmpty) return flat;
      } catch (_) {}
      try {
        final select = await OrgService().getOrgSelect();
        if (select.isNotEmpty) return select;
      } catch (_) {}
      return const <OrgNode>[];
    }

    _orgNodes = await fetch();
    _buildOrgNameMap(_orgNodes);
    if (mounted) setState(() {});
  }

  /// 递归建立 orgId -> name / type 映射，用于展示用户所属门店/渠道商及其组织类型。
  void _buildOrgNameMap(List<OrgNode> nodes) {
    for (final node in nodes) {
      if (node.id.isNotEmpty) {
        if (node.name.isNotEmpty) _orgNameMap[node.id] = node.name;
        _orgTypeMap[node.id] = node.type;
      }
      if (node.children.isNotEmpty) {
        _buildOrgNameMap(node.children);
      }
    }
  }

  /// 展示用户归属（门店/渠道商/代理商）。
  String _displayOrgName(SysUser user) {
    final t = AppLocalizations.of(context);
    if (user.orgName.isNotEmpty) return user.orgName;
    if (user.orgId.isNotEmpty) {
      final name = _orgNameMap[user.orgId];
      if (name != null && name.isNotEmpty) return name;
    }
    return t.unassigned;
  }

  /// 组织类型 → 中文标签（0=平台 1=渠道 2=代理商 3=门店 4=设备分组）。
  String _orgTypeLabel(int type) {
    switch (type) {
      case 1:
        return '渠道';
      case 2:
        return '代理商';
      case 3:
        return '门店';
      case 4:
        return '设备分组';
      default:
        return '平台';
    }
  }

  /// 用户归属展示：优先按所属组织类型展示「门店 / 渠道 / 代理商」，
  /// 这是该字段最直观的归属信息（避免显示裸数字 roleId）。
  /// 组织类型无法解析（orgId 缺失或不在组织树）时，再回退到角色名 / 角色名数组。
  String _displayRoleName(SysUser user) {
    final t = AppLocalizations.of(context);
    final type = user.orgId.isNotEmpty ? _orgTypeMap[user.orgId] : null;
    if (type != null) return _orgTypeLabel(type);
    if (user.roleNames.isNotEmpty) return user.roleNames.join('/');
    if (user.roleName.isNotEmpty) return user.roleName;
    final matched = _roles.where((r) => r.roleId == user.roleId).toList();
    if (matched.isNotEmpty) return matched.first.roleName;
    return t.unassigned;
  }

  Future<void> _loadData({bool reset = false}) async {
    if (_loading) return;
    if (reset) {
      _page = 1;
      _hasMore = true;
      _items.clear();
    }
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      final scope = SessionOrgScope.instance;
      // 首次加载时预取「当前用户组织范围内」的全部组织 ID，
      // 用于客户端二次收敛，确保受限账号只能看到本组织及下属组织的用户。
      if (scope.enabled && _scopeOrgIds == null) {
        _scopeOrgIds = await OrgService().scopedOrgIdSet();
      }
      // 未手动选择组织时：
      // - 管理员不附加 orgId，拉取全量用户；
      // - 受限账号（渠道商/代理商）也不附加 orgId，由后端按当前会话的数据权限
      //   返回范围内用户，避免直接传 agent/channel 的 orgId 导致后端误判为空。
      // 手动选择组织后，按所选 orgId 精确筛选。
      final effectiveOrgId = _selectedOrgId;
      // 用户名搜索不传给后端：后端按 username 大小写敏感匹配，会漏掉大小写
      // 不同的记录（如「ADMIN」搜不到「admin」）。改为前端不区分大小写过滤，
      // 确保大小写均可命中。
      final list = await _service.getUserList(
        page: _page,
        limit: _limit,
        username: null,
        orgId: effectiveOrgId,
      );
      // 客户端收敛：受限账号仅保留归属组织在范围内的用户（后端可能忽略 orgId 参数）。
      var filtered = scope.enabled && _scopeOrgIds != null
          ? list.where((u) => _scopeOrgIds!.contains(u.orgId)).toList()
          : list;
      // 前端不区分大小写按用户名过滤（核心修复点）。
      final kwLower = _searchKeyword.trim().toLowerCase();
      if (kwLower.isNotEmpty) {
        filtered = filtered
            .where((u) => u.username.toLowerCase().contains(kwLower))
            .toList();
      }
      _items.addAll(filtered);
      _hasMore = list.length >= _limit;
      // 列表接口不返回角色字段（Web 端亦不显示角色列）；
      // 对「角色未分配」的用户批量拉取详情以补全 roleName/roleId。
      _enrichRoles(filtered);
    } on ApiException catch (e) {
      _error = e.message;
    } catch (e) {
      _error = e.toString();
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  /// 对列表中「角色未分配」的用户批量拉取详情，补全 roleName/roleId。
  ///
  /// /sys/user/list 不返回角色字段（Web 端列表亦无角色列），
  /// 角色仅在 /sys/user/info/{id} 详情接口中返回。本方法以并发限制 3
  /// 逐批拉取，避免 N+1 压垮接口；失败时静默跳过（不阻断列表展示）。
  Future<void> _enrichRoles(List<SysUser> fresh) async {
    final needEnrich = fresh
        .where((u) =>
            u.roleId.isEmpty &&
            u.roleName.isEmpty &&
            u.roleNames.isEmpty)
        .toList();
    if (needEnrich.isEmpty || !mounted) return;

    const concurrency = 3;
    for (var i = 0; i < needEnrich.length; i += concurrency) {
      if (!mounted) return;
      final batch = needEnrich.skip(i).take(concurrency).toList();
      final futures = batch.map((u) async {
        try {
          final detail = await _service.getUserInfo(u.id);
          return MapEntry(u.id, detail);
        } catch (_) {
          return null;
        }
      }).toList();
      final results = await Future.wait(futures);
      var changed = false;
      for (final r in results) {
        if (r == null || !mounted) continue;
        final idx = _items.indexWhere((u) => u.id == r.key);
        if (idx < 0) continue;
        final detail = r.value;
        if (detail.roleId.isNotEmpty ||
            detail.roleName.isNotEmpty ||
            detail.roleNames.isNotEmpty) {
          _items[idx] = _items[idx].copyWith(
            roleId: detail.roleId,
            roleName: detail.roleName,
            roleNames: detail.roleNames,
          );
          changed = true;
        }
      }
      if (changed && mounted) setState(() {});
    }
  }

  Future<void> _loadMore() async {
    if (_loading || !_hasMore) return;
    _page++;
    await _loadData();
  }

  Future<void> _refresh() async {
    await _loadData(reset: true);
  }

  void _onSearchChanged(String value) {
    _searchKeyword = value;
    _refresh();
  }

  Future<void> _showForm({SysUser? user}) async {
    final t = AppLocalizations.of(context);
    if (!_rolesLoaded) await _loadRoles();

    // 编辑时若角色信息缺失，拉取用户详情以正确初始化角色字段。
    SysUser? effectiveUser = user;
    if (user != null &&
        user.roleId.isEmpty &&
        user.roleName.isEmpty &&
        user.roleNames.isEmpty) {
      try {
        effectiveUser = await _service.getUserInfo(user.id);
      } catch (_) {
        effectiveUser = user;
      }
      if (!mounted) return;
    }

    final currentUser = ref.read(authProvider).user;
    final result = await showModalBottomSheet<Map<String, dynamic>>(
      context: context,
      isScrollControlled: true,
      builder: (context) => _UserForm(
        user: effectiveUser,
        roles: _roles,
        orgNodes: _orgNodes,
        currentUserOrgId: currentUser?.orgId,
        currentUserRoleId: currentUser?.roleId,
      ),
    );

    if (result == null) return;

    try {
      await _service.saveUser(result);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(t.saved)),
        );
        _refresh();
      }
    } on ApiException catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(e.message)),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('${t.saveFailed}：${formatApiError(e)}')),
        );
      }
    }
  }

  Future<void> _deleteUser(SysUser user) async {
    final t = AppLocalizations.of(context);
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: Text(t.deleteUserConfirmTitle),
        content: Text(t.deleteUserConfirmContent(user.username)),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: Text(t.cancel),
          ),
          FilledButton(
            onPressed: () => Navigator.pop(context, true),
            child: Text(t.delete),
          ),
        ],
      ),
    );

    if (confirmed != true) return;

    try {
      await _service.deleteUser([int.tryParse(user.id) ?? 0]);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(t.deleted)),
        );
        _refresh();
      }
    } on ApiException catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(e.message)),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('${t.deleteFailed}：${formatApiError(e)}')),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final t = AppLocalizations.of(context);
    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: false,
        title: Text(t.userManagement),
      ),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
            child: Row(
              children: [
                // 所属组织（门店）筛选，参考 web 端下拉样式。
                Expanded(
                  flex: 2,
                  child: InputDecorator(
                    decoration: InputDecoration(
                      labelText: t.org,
                      border: const OutlineInputBorder(),
                      prefixIcon: const Icon(Icons.account_tree),
                      contentPadding: const EdgeInsets.symmetric(horizontal: 12),
                    ),
                    child: DropdownButtonHideUnderline(
                      child: DropdownButton<String?>(
                        isExpanded: true,
                        value: _selectedOrgId,
                        hint: Text(t.all),
                        items: [
                          DropdownMenuItem<String?>(
                            value: null,
                            child: Text(t.all),
                          ),
                          ..._orgNameMap.entries
                              .where((e) => e.key.isNotEmpty && e.value.isNotEmpty)
                              .map((e) => DropdownMenuItem<String?>(
                                    value: e.key,
                                    child: Text(e.value),
                                  )),
                        ],
                        onChanged: (v) {
                          setState(() => _selectedOrgId = v);
                          _refresh();
                        },
                      ),
                    ),
                  ),
                ),
                const SizedBox(width: 8),
                // 用户名搜索
                Expanded(
                  flex: 3,
                  child: TextField(
                    controller: _searchController,
                    decoration: InputDecoration(
                      hintText: t.searchUsernameHint,
                      prefixIcon: const Icon(Icons.search),
                      suffixIcon: _searchKeyword.isEmpty
                          ? null
                          : IconButton(
                              icon: const Icon(Icons.clear),
                              onPressed: () {
                                _searchController.clear();
                                _onSearchChanged('');
                              },
                            ),
                      border: const OutlineInputBorder(),
                    ),
                    onChanged: _onSearchChanged,
                  ),
                ),
              ],
            ),
          ),
          Expanded(child: _buildBody()),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => _showForm(),
        child: const Icon(Icons.person_add),
      ),
    );
  }

  /// 当前账号是否存在下级账号（即列表中存在 username 与当前登录账号不同的用户）。
  ///
  /// - 当前用户未登录：按 false 处理；
  /// - 列表为空 或 仅包含当前账号自身：false（展示自身账号信息）；
  /// - 包含其他用户：true（展示下级账号列表，不展示自身密码）。
  bool get _hasSubordinates {
    final currentUser = ref.read(authProvider).user;
    if (currentUser == null) return false;
    return _items.any((u) => u.username != currentUser.account);
  }

  Widget _buildBody() {
    final t = AppLocalizations.of(context);
    if (_error != null && _items.isEmpty) {
      return Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(_error!),
            const SizedBox(height: 8),
            FilledButton.tonal(
              onPressed: _refresh,
              child: Text(t.retry),
            ),
          ],
        ),
      );
    }

    final hasSubordinates = _hasSubordinates;

    // 数据加载完成且当前账号无下级账号：展示自身账号名与密码。
    if (!_loading && !hasSubordinates) {
      return RefreshIndicator(
        onRefresh: _refresh,
        child: SingleChildScrollView(
          physics: const AlwaysScrollableScrollPhysics(),
          child: _buildCurrentUserCard(),
        ),
      );
    }

    return RefreshIndicator(
      onRefresh: _refresh,
      child: ListView.builder(
        controller: _scrollController,
        physics: const AlwaysScrollableScrollPhysics(),
        itemCount: _items.length + 1,
        itemBuilder: (context, index) {
          if (index == _items.length) {
            if (_loading) {
              return const Padding(
                padding: EdgeInsets.all(16),
                child: Center(child: CircularProgressIndicator()),
              );
            }
            if (!_hasMore) {
              return Padding(
                padding: const EdgeInsets.all(16),
                child: Center(child: Text(t.noMoreData)),
              );
            }
            return const SizedBox.shrink();
          }
          final user = _items[index];
          return Card(
            margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
            child: ListTile(
              title: Text(user.username),
              subtitle: Text(
                '${t.roleLabel}：${_displayRoleName(user)}  |  '
                '${user.status == 0 ? t.statusNormal : t.statusDisabled}  |  '
                '${t.orgLabel}：${_displayOrgName(user)}',
              ),
              trailing: PopupMenuButton<String>(
                onSelected: (value) {
                  if (value == 'edit') {
                    _showForm(user: user);
                  } else if (value == 'delete') {
                    _deleteUser(user);
                  }
                },
                itemBuilder: (context) => [
                  PopupMenuItem(value: 'edit', child: Text(t.edit)),
                  PopupMenuItem(value: 'delete', child: Text(t.delete)),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  /// 无下级账号时展示的「当前账号信息」卡片。
  ///
  /// 展示当前登录账号的账号名与密码：
  /// - 账号：从 [authProvider.user.account] 读取；
  /// - 密码：从 [CredentialStorage.savedPassword] 读取，支持点击图标切换显隐；
  ///   若用户未勾选「记住密码」导致本地无密码，则显示「未保存」。
  Widget _buildCurrentUserCard() {
    final t = AppLocalizations.of(context);
    final currentUser = ref.read(authProvider).user;
    final account = currentUser?.account ?? '';
    final savedPassword = CredentialStorage.instance.savedPassword;
    final hasPassword = savedPassword != null && savedPassword.isNotEmpty;
    final displayPassword = _showOwnPassword
        ? (savedPassword ?? t.passwordNotSaved)
        : (hasPassword ? '••••••' : t.passwordNotSaved);

    return Center(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Card(
          elevation: 2,
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 24),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Icon(
                      Icons.account_circle,
                      color: Theme.of(context).colorScheme.primary,
                      size: 28,
                    ),
                    const SizedBox(width: 12),
                    Text(
                      t.currentAccountInfo,
                      style: Theme.of(context).textTheme.titleMedium,
                    ),
                  ],
                ),
                const SizedBox(height: 20),
                _buildInfoRow(label: t.account, value: account),
                const SizedBox(height: 16),
                _buildInfoRow(
                  label: t.password,
                  value: displayPassword,
                  trailing: hasPassword
                      ? IconButton(
                          icon: Icon(
                            _showOwnPassword
                                ? Icons.visibility_off_outlined
                                : Icons.visibility_outlined,
                          ),
                          tooltip: _showOwnPassword
                              ? t.hidePassword
                              : t.showPassword,
                          onPressed: () => setState(
                            () => _showOwnPassword = !_showOwnPassword,
                          ),
                        )
                      : null,
                ),
                const SizedBox(height: 20),
                Text(
                  t.noSubordinateAccount,
                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
                        color: Theme.of(context)
                            .colorScheme
                            .onSurfaceVariant,
                      ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildInfoRow({
    required String label,
    required String value,
    Widget? trailing,
  }) {
    return Row(
      children: [
        SizedBox(
          width: 64,
          child: Text(
            '$label：',
            style: TextStyle(
              color: Theme.of(context).colorScheme.onSurfaceVariant,
            ),
          ),
        ),
        Expanded(
          child: Text(
            value,
            style: Theme.of(context).textTheme.bodyLarge?.copyWith(
                  fontWeight: FontWeight.w500,
                ),
          ),
        ),
        if (trailing != null) trailing,
      ],
    );
  }
}

/// 组织下拉项：携带层级深度，用于按组织树自上而下排序并缩进展示。
class _OrgOption {
  const _OrgOption({
    required this.node,
    required this.depth,
  });

  final OrgNode node;
  final int depth;
}

/// 用户表单。
class _UserForm extends StatefulWidget {
  const _UserForm({
    this.user,
    this.roles = const [],
    this.orgNodes = const [],
    this.currentUserOrgId,
    this.currentUserRoleId,
  });

  final SysUser? user;
  final List<SysRole> roles;
  final List<OrgNode> orgNodes;

  /// 当前登录用户所属组织 ID，新增用户时作为默认值。
  final String? currentUserOrgId;

  /// 当前登录用户角色 ID，新增用户时作为默认值。
  final String? currentUserRoleId;

  @override
  State<_UserForm> createState() => _UserFormState();
}

class _UserFormState extends State<_UserForm> {
  final _formKey = GlobalKey<FormState>();
  late TextEditingController _usernameCtrl;
  late TextEditingController _emailCtrl;
  late TextEditingController _mobileCtrl;
  late TextEditingController _passwordCtrl;
  late TextEditingController _confirmPasswordCtrl;
  late String _roleId;
  late int _status;
  late String _orgId;

  /// 密码是否以密文显示（true 隐藏，false 显示）。
  bool _obscurePassword = true;

  /// 确认密码是否以密文显示（true 隐藏，false 显示）。
  bool _obscureConfirmPassword = true;

  List<_OrgOption> _orgOptions = [];

  @override
  void initState() {
    super.initState();
    final u = widget.user;
    final isAdd = u == null;
    _usernameCtrl = TextEditingController(text: u?.username ?? '');
    _emailCtrl = TextEditingController(text: u?.email ?? '');
    _mobileCtrl = TextEditingController(text: u?.mobile ?? '');
    _passwordCtrl = TextEditingController();
    _confirmPasswordCtrl = TextEditingController();

    // 编辑模式下，密码输入后需要动态显示「确认密码」字段。
    // 仅在编辑态监听，新增态确认密码始终显示。
    if (u != null) {
      _passwordCtrl.addListener(_onPasswordChanged);
    }

    // 编辑时沿用原值；新增时默认选中当前登录用户的组织与角色。
    _roleId = u?.roleId ?? '';
    if (_roleId.isEmpty && isAdd) {
      _roleId = widget.currentUserRoleId ?? '';
    }
    // 若后端未返回 roleId，仅返回了 roleName/roleNames，尝试按名称匹配角色 ID。
    if (_roleId.isEmpty && u != null) {
      final nameToMatch = u.roleName.isNotEmpty
          ? u.roleName
          : (u.roleNames.isNotEmpty ? u.roleNames.first : '');
      if (nameToMatch.isNotEmpty) {
        final matched = _findRoleByName(widget.roles, nameToMatch);
        if (matched != null) {
          _roleId = matched.roleId;
        }
      }
    }

    _status = u?.status ?? 0;
    _orgId = u?.orgId ?? '';
    // 若后端未返回 orgId，仅返回了 orgName，尝试在组织树中按名称匹配组织 ID。
    if (_orgId.isEmpty && u != null && u.orgName.isNotEmpty) {
      final matched = _findOrgByName(widget.orgNodes, u.orgName);
      if (matched != null) {
        _orgId = matched.id;
      }
    }
    if (_orgId.isEmpty && isAdd) {
      _orgId = widget.currentUserOrgId ?? '';
    }
    _orgOptions = _buildOrgOptions(widget.orgNodes);
  }

  /// 按角色名称查找角色，支持不区分大小写与前后空格。
  SysRole? _findRoleByName(List<SysRole> roles, String name) {
    final target = name.trim();
    if (target.isEmpty) return null;
    final targetLower = target.toLowerCase();
    return roles.cast<SysRole?>().firstWhere(
          (r) => r!.roleName.trim().toLowerCase() == targetLower,
          orElse: () => null,
        );
  }

  /// 在组织树/列表中按名称查找节点（递归），支持不区分大小写与前后空格。
  OrgNode? _findOrgByName(List<OrgNode> nodes, String name) {
    final target = name.trim();
    if (target.isEmpty) return null;
    final targetLower = target.toLowerCase();
    for (final node in nodes) {
      if (node.name.trim().toLowerCase() == targetLower) return node;
      final found = _findOrgByName(node.children, name);
      if (found != null) return found;
    }
    return null;
  }

  /// 编辑模式下密码输入变化时的回调：用于动态显示/隐藏「确认密码」字段。
  void _onPasswordChanged() {
    if (widget.user != null) setState(() {});
  }

  @override
  void dispose() {
    _usernameCtrl.dispose();
    _emailCtrl.dispose();
    _mobileCtrl.dispose();
    _passwordCtrl.removeListener(_onPasswordChanged);
    _passwordCtrl.dispose();
    _confirmPasswordCtrl.dispose();
    super.dispose();
  }

  /// 编辑模式下，把原角色信息展示为只读文本。
  String _displayRoleForEdit(SysUser user) {
    final t = AppLocalizations.of(context);
    if (user.roleNames.isNotEmpty) return user.roleNames.join('/');
    if (user.roleName.isNotEmpty) return user.roleName;
    if (user.roleId.isNotEmpty) return user.roleId;
    return t.unassigned;
  }

  /// 把表单内部选项转换为选择器需要的公共数据结构。
  List<OrgPickerOption> _toPickerOptions() {
    return _orgOptions
        .map((o) => OrgPickerOption(
              node: o.node,
              depth: o.depth,
              selectable: true,
            ))
        .toList();
  }

  /// 根据输入的组织节点（树形或扁平）构建层级有序的下拉选项。
  List<_OrgOption> _buildOrgOptions(List<OrgNode> nodes) {
    final hasTree = nodes.any((n) => n.children.isNotEmpty);
    if (hasTree) {
      return _buildHierarchicalOptions(nodes);
    }
    return _buildHierarchyFromFlatList(nodes);
  }

  /// 把组织树递归扁平化为带深度的下拉项。
  List<_OrgOption> _buildHierarchicalOptions(List<OrgNode> nodes,
      {int depth = 0}) {
    final result = <_OrgOption>[];
    for (final node in nodes) {
      result.add(_OrgOption(node: node, depth: depth));
      if (node.children.isNotEmpty) {
        result.addAll(
            _buildHierarchicalOptions(node.children, depth: depth + 1));
      }
    }
    return result;
  }

  /// 当树接口不可用时，根据 parentId 将扁平列表重建为层级顺序。
  List<_OrgOption> _buildHierarchyFromFlatList(List<OrgNode> nodes) {
    final map = <String, OrgNode>{};
    final roots = <OrgNode>[];
    for (final node in nodes) {
      map[node.id] = node;
    }
    for (final node in nodes) {
      if (node.parentId.isEmpty || !map.containsKey(node.parentId)) {
        roots.add(node);
      } else {
        final parent = map[node.parentId]!;
        map[node.parentId] = OrgNode(
          id: parent.id,
          name: parent.name,
          type: parent.type,
          parentId: parent.parentId,
          children: [...parent.children, node],
          address: parent.address,
          contactPhone: parent.contactPhone,
          activationCode: parent.activationCode,
          province: parent.province,
          city: parent.city,
          themeId: parent.themeId,
        );
      }
    }
    return _buildHierarchicalOptions(roots);
  }

  void _submit() {
    if (!_formKey.currentState!.validate()) return;
    // 后端 status：1=启用/正常，0=禁用。App 内部 _status 以 0=正常、1=禁用 表示，
    // 这里转换回后端值再提交，避免状态在保存后被反转。
    final backendStatus = _status == 0 ? 1 : 0;
    final data = <String, dynamic>{
      'username': _usernameCtrl.text.trim(),
      'email': _emailCtrl.text.trim(),
      'mobile': _mobileCtrl.text.trim(),
      'status': backendStatus,
    };

    // 提交角色：后端更新接口以 roleIdList 为准（与 Web 端 saveUser 一致）。
    final u = widget.user;
    if (_roleId.isNotEmpty) {
      data['roleId'] = _roleId;
      data['roleIdList'] = [_roleId];
    } else if (u?.roleId.isNotEmpty == true) {
      data['roleId'] = u!.roleId;
      data['roleIdList'] = [u.roleId];
    }
    if (u != null && u.roleNames.isNotEmpty && data['roleIdList'] == null) {
      data['roleName'] = u.roleNames.join(',');
    }

    // 提交所属组织（门店 / 渠道商）。
    if (_orgId.isNotEmpty) {
      data['orgId'] = _orgId;
    } else if (u?.orgId.isNotEmpty == true) {
      data['orgId'] = u!.orgId;
    }

    if (u != null) {
      data['id'] = u.id;
    }
    if (_passwordCtrl.text.isNotEmpty) {
      data['password'] = _passwordCtrl.text;
    }
    Navigator.pop(context, data);
  }

  @override
  Widget build(BuildContext context) {
    final t = AppLocalizations.of(context);
    final isEdit = widget.user != null;
    return Padding(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
      ),
      child: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                isEdit ? t.editUser : t.addUser,
                style: Theme.of(context).textTheme.titleLarge,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _usernameCtrl,
                decoration: InputDecoration(
                  labelText: t.username,
                  border: const OutlineInputBorder(),
                ),
                validator: (v) =>
                    (v == null || v.trim().isEmpty) ? t.usernameRequired : null,
              ),
              const SizedBox(height: 12),
              TextFormField(
                controller: _emailCtrl,
                decoration: InputDecoration(
                  labelText: t.email,
                  border: const OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 12),
              TextFormField(
                controller: _mobileCtrl,
                decoration: InputDecoration(
                  labelText: t.mobile,
                  border: const OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 12),
              TextFormField(
                controller: _passwordCtrl,
                obscureText: _obscurePassword,
                decoration: InputDecoration(
                  labelText: t.password,
                  hintText: isEdit ? t.passwordEditHint : t.passwordRequired,
                  border: const OutlineInputBorder(),
                  suffixIcon: IconButton(
                    icon: Icon(
                      _obscurePassword
                          ? Icons.visibility_off_outlined
                          : Icons.visibility_outlined,
                    ),
                    onPressed: () => setState(() => _obscurePassword = !_obscurePassword),
                  ),
                ),
                validator: (v) {
                  if (!isEdit && (v == null || v.isEmpty)) {
                    return t.passwordRequired;
                  }
                  return null;
                },
              ),
              if (!isEdit || _passwordCtrl.text.isNotEmpty) ...[
                const SizedBox(height: 12),
                TextFormField(
                  controller: _confirmPasswordCtrl,
                  obscureText: _obscureConfirmPassword,
                  decoration: InputDecoration(
                    labelText: t.confirmPassword,
                    hintText: t.confirmPasswordHint,
                    border: const OutlineInputBorder(),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscureConfirmPassword
                            ? Icons.visibility_off_outlined
                            : Icons.visibility_outlined,
                      ),
                      onPressed: () => setState(() => _obscureConfirmPassword = !_obscureConfirmPassword),
                    ),
                  ),
                  validator: (v) {
                    if (!isEdit || _passwordCtrl.text.isNotEmpty) {
                      if (v == null || v.isEmpty) {
                        return t.confirmPasswordRequired;
                      }
                      if (v != _passwordCtrl.text) {
                        return t.passwordsDoNotMatch;
                      }
                    }
                    return null;
                  },
                ),
              ],
              const SizedBox(height: 12),
              // 所属组织（门店 / 渠道商）选择器：进入编辑页自动展开并高亮已选项。
              if (widget.orgNodes.isEmpty && _orgId.isEmpty)
                TextFormField(
                  initialValue: widget.user?.orgName ?? t.none,
                  enabled: false,
                  decoration: InputDecoration(
                    labelText: t.org,
                    border: const OutlineInputBorder(),
                    helperText: t.noOrgHint,
                  ),
                )
              else
                OrgPickerFormField(
                  value: _orgId.isEmpty ? null : _orgId,
                  labelText: t.org,
                  options: _toPickerOptions(),
                  searchHint: t.searchOrgHint,
                  emptyHint: t.noMatchingOrg,
                  // 修复：新增/编辑用户时不再自动弹出组织选择器，
                  // 需先填完表单基本信息、再主动点击「所属组织」字段才展开。
                  autoOpen: false,
                  onChanged: (v) => setState(() => _orgId = v ?? ''),
                ),
              const SizedBox(height: 12),
              // 角色选择器：可视化高亮勾选，编辑时按 roleId 自动选中；
              // 新增默认选中当前登录用户角色（原逻辑），亦可不选中。
              if (widget.roles.isEmpty && _roleId.isEmpty && widget.user != null)
                TextFormField(
                  initialValue: _displayRoleForEdit(widget.user!),
                  enabled: false,
                  decoration: InputDecoration(
                    labelText: t.role,
                    border: const OutlineInputBorder(),
                    helperText: t.rolesLoadFailed,
                  ),
                )
              else
                FormField<String>(
                  initialValue: _roleId,
                  validator: (v) {
                    if (widget.user != null) return null;
                    return _roleId.isEmpty ? t.roleRequired : null;
                  },
                  builder: (field) => Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        t.role,
                        style: Theme.of(context).textTheme.labelMedium,
                      ),
                      const SizedBox(height: 8),
                      Wrap(
                        spacing: 8,
                        runSpacing: 8,
                        children: widget.roles.map((role) {
                          final selected = _roleId == role.roleId;
                          return ChoiceChip(
                            showCheckmark: false,
                            avatar: selected
                                ? Icon(
                                    Icons.check,
                                    size: 18,
                                    color: Theme.of(context)
                                        .colorScheme
                                        .onPrimary,
                                  )
                                : null,
                            selectedColor:
                                Theme.of(context).colorScheme.primary,
                            labelStyle: TextStyle(
                              color: selected
                                  ? Theme.of(context).colorScheme.onPrimary
                                  : Theme.of(context).colorScheme.onSurface,
                            ),
                            selected: selected,
                            label: Text(role.roleName),
                            onSelected: (sel) {
                              setState(() =>
                                  _roleId = sel ? role.roleId : '');
                              field.didChange(_roleId);
                            },
                          );
                        }).toList(),
                      ),
                      if (field.hasError)
                        Padding(
                          padding: const EdgeInsets.only(top: 6),
                          child: Text(
                            field.errorText ?? '',
                            style: Theme.of(context)
                                .textTheme
                                .bodySmall
                                ?.copyWith(
                                  color: Theme.of(context)
                                      .colorScheme
                                      .error,
                                ),
                          ),
                        ),
                    ],
                  ),
                ),
              const SizedBox(height: 12),
              DropdownButtonFormField<int>(
                value: _status,
                decoration: InputDecoration(
                  labelText: t.status,
                  border: const OutlineInputBorder(),
                ),
                items: [
                  DropdownMenuItem(value: 0, child: Text(t.statusNormal)),
                  DropdownMenuItem(value: 1, child: Text(t.statusDisabled)),
                ],
                onChanged: (v) => setState(() => _status = v ?? 0),
              ),
              const SizedBox(height: 24),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  TextButton(
                    onPressed: () => Navigator.pop(context),
                    child: Text(t.cancel),
                  ),
                  const SizedBox(width: 8),
                  FilledButton(
                    onPressed: _submit,
                    child: Text(t.save),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}