import 'package:dio/dio.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.dart';
import 'package:url_launcher/url_launcher.dart';
import '../../core/auth/auth_state.dart';
import '../../core/config/app_config.dart';
import '../../core/theme/app_theme.dart';
import '../../models/number_rule.dart';
import '../../models/user.dart';
import '../../models/warehouse.dart';
import '../../providers/license_provider.dart';
import '../../providers/number_rule_provider.dart';
import '../../providers/update_provider.dart';
import '../../providers/user_provider.dart';
import '../../providers/warehouse_provider.dart';

class SettingsScreen extends ConsumerStatefulWidget {
  const SettingsScreen({super.key});

  @override
  ConsumerState<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends ConsumerState<SettingsScreen> {
  // System params local state (UI only, no backend yet)
  String _sysName = '酒库管理系统';
  String _sysCurrency = '人民币（CNY）';
  String _sysDateFormat = 'YYYY-MM-DD';
  String _sysTimezone = 'Asia/Shanghai (UTC+8)';
  bool _requireStockInApproval = true;
  bool _requireStockOutApproval = true;
  bool _allowOverstock = false;

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 6,
      child: Column(
        children: [
          Container(
            color: AppTheme.surface,
            child: const TabBar(
              isScrollable: true,
              labelColor: AppTheme.primary,
              unselectedLabelColor: AppTheme.textSecondary,
              indicatorColor: AppTheme.primary,
              indicatorWeight: 2,
              labelStyle:
                  TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
              tabs: [
                Tab(text: '用户管理'),
                Tab(text: '仓库管理'),
                Tab(text: '编号规则'),
                Tab(text: '系统参数'),
                Tab(text: '数据导入'),
                Tab(text: '关于'),
              ],
            ),
          ),
          const Divider(height: 1),
          Expanded(
            child: TabBarView(
              children: [
                _buildUsersTab(),
                _buildWarehousesTab(),
                _buildNumberRulesTab(),
                _buildSystemParamsTab(),
                _buildImportTab(),
                _buildAboutTab(),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildUsersTab() {
    final asyncUsers = ref.watch(userListProvider);
    return Column(
      children: [
        Container(
          height: 52,
          color: AppTheme.surface,
          padding: const EdgeInsets.symmetric(horizontal: 12),
          child: Row(
            children: [
              ElevatedButton.icon(
                onPressed: () => _showAddUserDialog(context),
                icon: const Icon(Icons.person_add, size: 16),
                label: const Text('新增用户'),
              ),
            ],
          ),
        ),
        const Divider(height: 1),
        Expanded(
          child: asyncUsers.when(
            loading: () => const Center(child: CircularProgressIndicator()),
            error: (e, _) => Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Icon(Icons.cloud_off, size: 40, color: AppTheme.textSecondary),
                  const SizedBox(height: 12),
                  const Text('暂无数据，网络不可用',
                      style: const TextStyle(color: AppTheme.textSecondary)),
                  const SizedBox(height: 12),
                  ElevatedButton(
                    onPressed: () => ref.read(userListProvider.notifier).reload(),
                    child: const Text('重试'),
                  ),
                ],
              ),
            ),
            data: (users) => SingleChildScrollView(
              child: DataTable(
                headingRowColor: WidgetStateProperty.all(const Color(0xFFF0F4FF)),
                columns: const [
                  DataColumn(label: Text('姓名')),
                  DataColumn(label: Text('用户名')),
                  DataColumn(label: Text('角色')),
                  DataColumn(label: Text('状态')),
                  DataColumn(label: Text('操作')),
                ],
                rows: users
                    .map((u) => DataRow(cells: [
                          DataCell(Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              CircleAvatar(
                                radius: 14,
                                backgroundColor:
                                    AppTheme.primary.withOpacity(0.15),
                                child: Text(
                                  (u.realName ?? u.username)
                                      .substring(0, 1),
                                  style: const TextStyle(
                                      fontSize: 12,
                                      color: AppTheme.primary,
                                      fontWeight: FontWeight.w600),
                                ),
                              ),
                              const SizedBox(width: 8),
                              Text(u.realName ?? u.username),
                            ],
                          )),
                          DataCell(Text(u.username,
                              style: const TextStyle(
                                  fontFamily: 'monospace', fontSize: 12))),
                          DataCell(_RoleBadge(u.roleLabel)),
                          DataCell(Switch(
                            value: u.isActive,
                            onChanged: (v) => ref
                                .read(userListProvider.notifier)
                                .updateUser(u.id, {'is_active': v}),
                            materialTapTargetSize:
                                MaterialTapTargetSize.shrinkWrap,
                          )),
                          DataCell(Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              TextButton(
                                onPressed: () =>
                                    _showEditUserDialog(context, u),
                                child: const Text('编辑',
                                    style: TextStyle(fontSize: 12)),
                              ),
                              TextButton(
                                onPressed: () =>
                                    _showResetPasswordDialog(context, u),
                                child: const Text('重置密码',
                                    style: TextStyle(fontSize: 12)),
                              ),
                            ],
                          )),
                        ]))
                    .toList(),
              ),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildWarehousesTab() {
    final asyncWarehouses = ref.watch(warehouseListProvider);
    return Column(
      children: [
        Container(
          height: 52,
          color: AppTheme.surface,
          padding: const EdgeInsets.symmetric(horizontal: 12),
          child: Row(
            children: [
              ElevatedButton.icon(
                onPressed: () => _showWarehouseDialog(context),
                icon: const Icon(Icons.add, size: 16),
                label: const Text('新建'),
              ),
            ],
          ),
        ),
        const Divider(height: 1),
        Expanded(
          child: asyncWarehouses.when(
            loading: () => const Center(child: CircularProgressIndicator()),
            error: (e, _) => Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Icon(Icons.cloud_off, size: 40, color: AppTheme.textSecondary),
                const SizedBox(height: 12),
                const Text('暂无数据，网络不可用',
                      style: const TextStyle(color: AppTheme.textSecondary)),
                  const SizedBox(height: 12),
                  ElevatedButton(
                    onPressed: () =>
                        ref.read(warehouseListProvider.notifier).reload(),
                    child: const Text('重试'),
                  ),
                ],
              ),
            ),
            data: (warehouses) {
              if (warehouses.isEmpty) {
                return const Center(
                    child: Text('暂无仓库',
                        style:
                            TextStyle(color: AppTheme.textSecondary)));
              }
              return SingleChildScrollView(
                child: DataTable(
                  headingRowColor:
                      WidgetStateProperty.all(const Color(0xFFF0F4FF)),
                  columns: const [
                    DataColumn(label: Text('仓库名称')),
                    DataColumn(label: Text('位置')),
                    DataColumn(label: Text('默认仓库')),
                    DataColumn(label: Text('操作')),
                  ],
                  rows: warehouses
                      .map((w) => DataRow(cells: [
                            DataCell(Text(w.name,
                                style: const TextStyle(
                                    fontWeight: FontWeight.w500))),
                            DataCell(Text(w.location ?? '-')),
                            DataCell(w.isDefault
                                ? const Icon(Icons.check_circle,
                                    color: AppTheme.success, size: 18)
                                : const SizedBox()),
                            DataCell(Row(
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                TextButton(
                                  key: Key('btn_edit_${w.id}'),
                                  onPressed: () =>
                                      _showWarehouseDialog(context,
                                          warehouse: w),
                                  child: const Text('编辑',
                                      style: TextStyle(fontSize: 12)),
                                ),
                                TextButton(
                                  key: Key('btn_delete_${w.id}'),
                                  onPressed: () =>
                                      _confirmDeleteWarehouse(context, w),
                                  child: const Text('删除',
                                      style: TextStyle(
                                          fontSize: 12,
                                          color: AppTheme.danger)),
                                ),
                              ],
                            )),
                          ]))
                      .toList(),
                ),
              );
            },
          ),
        ),
      ],
    );
  }

  Future<void> _confirmDeleteWarehouse(
      BuildContext context, Warehouse w) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('确认删除'),
        content: Text('确认删除仓库「${w.name}」？'),
        actions: [
          TextButton(
              onPressed: () => Navigator.of(ctx).pop(false),
              child: const Text('取消')),
          ElevatedButton(
            onPressed: () => Navigator.of(ctx).pop(true),
            style: ElevatedButton.styleFrom(
                backgroundColor: AppTheme.danger,
                foregroundColor: Colors.white),
            child: const Text('删除'),
          ),
        ],
      ),
    );
    if (confirmed == true && mounted) {
      try {
        await ref
            .read(warehouseListProvider.notifier)
            .deleteWarehouse(w.id);
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
              content: Text('删除成功'),
              backgroundColor: AppTheme.success));
        }
      } catch (e) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(
              content: Text('删除失败：$e'),
              backgroundColor: AppTheme.danger));
        }
      }
    }
  }

  void _showWarehouseDialog(BuildContext context, {Warehouse? warehouse}) {
    showDialog(
      context: context,
      builder: (ctx) => _WarehouseFormDialog(
        warehouse: warehouse,
        onSaved: () =>
            ref.read(warehouseListProvider.notifier).reload(),
      ),
    );
  }

  Widget _buildNumberRulesTab() {
    final asyncRules = ref.watch(numberRuleListProvider);
    return asyncRules.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (e, _) => Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.cloud_off, size: 40, color: AppTheme.textSecondary),
                const SizedBox(height: 12),
                const Text('暂无数据，网络不可用',
                style: const TextStyle(color: AppTheme.textSecondary)),
            const SizedBox(height: 12),
            ElevatedButton(
              onPressed: () =>
                  ref.read(numberRuleListProvider.notifier).reload(),
              child: const Text('重试'),
            ),
          ],
        ),
      ),
      data: (rules) => SingleChildScrollView(
        padding: const EdgeInsets.all(24),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('编号规则配置',
                style:
                    TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
            const SizedBox(height: 4),
            const Text('配置各类单据的自动编号规则，修改后对新建单据生效',
                style: TextStyle(
                    fontSize: 13, color: AppTheme.textSecondary)),
            const SizedBox(height: 16),
            Card(
              child: DataTable(
                headingRowColor:
                    WidgetStateProperty.all(const Color(0xFFF0F4FF)),
                columns: const [
                  DataColumn(label: Text('单据类型')),
                  DataColumn(label: Text('前缀')),
                  DataColumn(label: Text('日期格式')),
                  DataColumn(label: Text('下一编号示例')),
                  DataColumn(label: Text('当前序号'), numeric: true),
                  DataColumn(label: Text('操作')),
                ],
                rows: rules
                    .map((r) => DataRow(cells: [
                          DataCell(Text(r.typeLabel,
                              style: const TextStyle(
                                  fontWeight: FontWeight.w500))),
                          DataCell(Container(
                            padding: const EdgeInsets.symmetric(
                                horizontal: 8, vertical: 2),
                            decoration: BoxDecoration(
                              color: AppTheme.primary.withOpacity(0.1),
                              borderRadius: BorderRadius.circular(3),
                            ),
                            child: Text(r.prefix,
                                style: const TextStyle(
                                    color: AppTheme.primary,
                                    fontFamily: 'monospace',
                                    fontSize: 13,
                                    fontWeight: FontWeight.w600)),
                          )),
                          DataCell(Text(r.dateFormat,
                              style: const TextStyle(
                                  fontSize: 12,
                                  color: AppTheme.textSecondary))),
                          DataCell(Text(r.exampleNo,
                              style: const TextStyle(
                                  fontFamily: 'monospace', fontSize: 12))),
                          DataCell(Text('${r.currentNo}')),
                          DataCell(TextButton(
                              onPressed: () =>
                                  _showNumberRuleDialog(context, r),
                              child: const Text('编辑',
                                  style: TextStyle(fontSize: 12)))),
                        ]))
                    .toList(),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _showNumberRuleDialog(BuildContext context, NumberRule rule) {
    final prefixCtrl = TextEditingController(text: rule.prefix);
    final currentNoCtrl =
        TextEditingController(text: '${rule.currentNo}');
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text('编辑编号规则 — ${rule.typeLabel}'),
        content: SizedBox(
          width: 360,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                controller: prefixCtrl,
                decoration: const InputDecoration(labelText: '前缀'),
              ),
              const SizedBox(height: 12),
              TextField(
                controller: currentNoCtrl,
                decoration: const InputDecoration(labelText: '当前序号'),
                keyboardType: TextInputType.number,
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
              onPressed: () => Navigator.of(ctx).pop(),
              child: const Text('取消')),
          ElevatedButton(
            onPressed: () async {
              Navigator.of(ctx).pop();
              try {
                await ref
                    .read(numberRuleListProvider.notifier)
                    .updateRule(rule.id, {
                  'prefix': prefixCtrl.text.trim(),
                  'current_no': int.tryParse(currentNoCtrl.text) ?? rule.currentNo,
                });
                if (context.mounted) {
                  ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(
                        content: Text('编号规则已更新'),
                        backgroundColor: AppTheme.success),
                  );
                }
              } catch (e) {
                if (context.mounted) {
                  ScaffoldMessenger.of(context).showSnackBar(
                    SnackBar(
                        content: Text('更新失败：$e'),
                        backgroundColor: AppTheme.danger),
                  );
                }
              }
            },
            child: const Text('保存'),
          ),
        ],
      ),
    );
  }

  Widget _buildSystemParamsTab() {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const Text('系统参数',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
          const SizedBox(height: 16),
          Card(
            child: Padding(
              padding: const EdgeInsets.all(20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const Text('基本设置',
                      style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: AppTheme.primaryDark)),
                  const Divider(height: 24),
                  _ParamRow(
                    label: '系统名称',
                    value: _sysName,
                    onEdit: () => _showEditParamDialog('系统名称', _sysName,
                        (v) => setState(() => _sysName = v)),
                  ),
                  _ParamRow(
                    label: '货币单位',
                    value: _sysCurrency,
                    onEdit: () => _showEditParamDialog('货币单位', _sysCurrency,
                        (v) => setState(() => _sysCurrency = v)),
                  ),
                  _ParamRow(
                    label: '日期格式',
                    value: _sysDateFormat,
                    onEdit: () => _showEditParamDialog('日期格式', _sysDateFormat,
                        (v) => setState(() => _sysDateFormat = v)),
                  ),
                  _ParamRow(
                    label: '时区',
                    value: _sysTimezone,
                    onEdit: () => _showEditParamDialog('时区', _sysTimezone,
                        (v) => setState(() => _sysTimezone = v)),
                  ),
                  const SizedBox(height: 16),
                  const Text('审核设置',
                      style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: AppTheme.primaryDark)),
                  const Divider(height: 24),
                  _ParamRow(
                    label: '入库单需要审核',
                    value: _requireStockInApproval ? '是' : '否',
                    switchValue: _requireStockInApproval,
                    onSwitchChanged: (v) =>
                        setState(() => _requireStockInApproval = v),
                  ),
                  _ParamRow(
                    label: '出库单需要审核',
                    value: _requireStockOutApproval ? '是' : '否',
                    switchValue: _requireStockOutApproval,
                    onSwitchChanged: (v) =>
                        setState(() => _requireStockOutApproval = v),
                  ),
                  _ParamRow(
                    label: '允许超量出库',
                    value: _allowOverstock ? '是' : '否',
                    switchValue: _allowOverstock,
                    onSwitchChanged: (v) =>
                        setState(() => _allowOverstock = v),
                  ),
                ],
              ),
            ),
          ),
          const SizedBox(height: 12),
          Row(
            children: [
              ElevatedButton(
                onPressed: () {
                  ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
                      content: Text('设置已保存'),
                      backgroundColor: AppTheme.success));
                },
                child: const Text('保存设置'),
              ),
              const SizedBox(width: 8),
              OutlinedButton(
                onPressed: () => setState(() {
                  _sysName = '酒库管理系统';
                  _sysCurrency = '人民币（CNY）';
                  _sysDateFormat = 'YYYY-MM-DD';
                  _sysTimezone = 'Asia/Shanghai (UTC+8)';
                  _requireStockInApproval = true;
                  _requireStockOutApproval = true;
                  _allowOverstock = false;
                }),
                child: const Text('重置默认'),
              ),
            ],
          ),
        ],
      ),
    );
  }

  // ── 数据导入 Tab ──────────────────────────────────────────
  Widget _buildImportTab() => const _BatchImportWidget();

  // ── 关于 Tab ─────────────────────────────────────────────
  Widget _buildAboutTab() {
    final appVersion = ref.watch(appVersionProvider).valueOrNull ?? 'v1.0.0';
    final updateInfo = ref.watch(updateProvider).valueOrNull;
    final licenseAsync = ref.watch(licenseProvider);

    return SingleChildScrollView(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // ── 版本信息 ──
          _AboutSection(
            title: '版本信息',
            children: [
              _AboutRow(label: '当前版本', value: appVersion),
              if (updateInfo != null && updateInfo.hasUpdate)
                _AboutRow(
                  label: '最新版本',
                  value: 'v${updateInfo.latestVersion}',
                  valueColor: AppTheme.success,
                  trailing: TextButton(
                    onPressed: () => launchUpdateUrl(updateInfo.downloadUrls),
                    child: const Text('立即更新'),
                  ),
                )
              else
                _AboutRow(
                  label: '最新版本',
                  value: updateInfo != null ? '已是最新' : '检查中…',
                  valueColor: AppTheme.textSecondary,
                  trailing: TextButton(
                    onPressed: () =>
                        ref.read(updateProvider.notifier).forceCheck(),
                    child: const Text('检查更新'),
                  ),
                ),
            ],
          ),
          const SizedBox(height: 20),

          // ── 授权信息 ──
          _AboutSection(
            title: '授权信息',
            children: [
              licenseAsync.when(
                loading: () => const _AboutRow(label: '授权状态', value: '加载中…'),
                error: (_, __) =>
                    const _AboutRow(label: '授权状态', value: '暂无授权信息'),
                data: (lic) {
                  if (lic == null) {
                    return const _AboutRow(label: '授权状态', value: '未激活');
                  }
                  return Column(
                    children: [
                      _AboutRow(label: '授权类型', value: lic.typeLabel),
                      _AboutRow(
                        label: '授权状态',
                        value: lic.isExpired
                            ? '已过期'
                            : lic.isActive
                                ? '正常'
                                : '已停用',
                        valueColor: lic.isExpired
                            ? AppTheme.danger
                            : lic.isActive
                                ? AppTheme.success
                                : AppTheme.textSecondary,
                      ),
                      if (lic.expiresAt != null)
                        _AboutRow(
                          label: '到期时间',
                          value: DateFormat('yyyy-MM-dd').format(lic.expiresAt!),
                          trailing: lic.daysRemaining != null &&
                                  lic.daysRemaining! <= 30
                              ? Chip(
                                  label: Text(
                                    lic.isExpired
                                        ? '已过期'
                                        : '剩余 ${lic.daysRemaining} 天',
                                    style: const TextStyle(
                                        fontSize: 11, color: Colors.white),
                                  ),
                                  backgroundColor: lic.isExpired
                                      ? AppTheme.danger
                                      : Colors.orange,
                                  padding: EdgeInsets.zero,
                                  materialTapTargetSize:
                                      MaterialTapTargetSize.shrinkWrap,
                                )
                              : null,
                        )
                      else
                        const _AboutRow(label: '到期时间', value: '永久有效'),
                      if (lic.activatedAt != null)
                        _AboutRow(
                          label: '激活时间',
                          value: DateFormat('yyyy-MM-dd')
                              .format(lic.activatedAt!),
                        ),
                    ],
                  );
                },
              ),
              const SizedBox(height: 8),
              Row(
                children: [
                  OutlinedButton.icon(
                    onPressed: () => _showRenewDialog(),
                    icon: const Icon(Icons.card_membership, size: 16),
                    label: const Text('续费 / 升级授权'),
                  ),
                ],
              ),
            ],
          ),
          const SizedBox(height: 20),

          // ── 关于我们 ──
          _AboutSection(
            title: '关于我们',
            children: [
              const _AboutRow(label: '开发商', value: '酒库科技有限公司'),
              const _AboutRow(label: '官方网站', value: 'https://jiu.example.com'),
              const _AboutRow(label: '联系邮箱', value: 'support@jiu.example.com'),
              const _AboutRow(label: '技术支持', value: '周一至周五 9:00 - 18:00'),
              const SizedBox(height: 8),
              Wrap(
                spacing: 8,
                children: [
                  OutlinedButton.icon(
                    onPressed: () async {
                      final uri = Uri.parse('mailto:support@jiu.example.com'
                          '?subject=酒库管理系统咨询');
                      if (await canLaunchUrl(uri)) launchUrl(uri);
                    },
                    icon: const Icon(Icons.email_outlined, size: 16),
                    label: const Text('发送邮件'),
                  ),
                ],
              ),
            ],
          ),
          const SizedBox(height: 20),

          // ── 意见反馈 ──
          _AboutSection(
            title: '意见反馈',
            children: [
              const _AboutRow(
                label: '问题反馈',
                value: '遇到 Bug 或有功能建议，欢迎告知我们',
              ),
              const SizedBox(height: 8),
              Wrap(
                spacing: 8,
                children: [
                  ElevatedButton.icon(
                    onPressed: () => _showFeedbackDialog(isBug: true),
                    icon: const Icon(Icons.bug_report_outlined, size: 16),
                    label: const Text('反馈 Bug'),
                  ),
                  OutlinedButton.icon(
                    onPressed: () => _showFeedbackDialog(isBug: false),
                    icon: const Icon(Icons.lightbulb_outline, size: 16),
                    label: const Text('功能建议'),
                  ),
                ],
              ),
            ],
          ),
        ],
      ),
    );
  }

  void _showRenewDialog() {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('续费 / 升级授权'),
        content: const Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('请联系我们获取续费报价：'),
            SizedBox(height: 12),
            SelectableText('📧 support@jiu.example.com',
                style: TextStyle(fontSize: 13)),
            SizedBox(height: 6),
            SelectableText('📞 400-000-0000',
                style: TextStyle(fontSize: 13)),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('关闭'),
          ),
          ElevatedButton(
            onPressed: () async {
              await Clipboard.setData(
                  const ClipboardData(text: 'support@jiu.example.com'));
              if (ctx.mounted) {
                Navigator.pop(ctx);
                ScaffoldMessenger.of(context).showSnackBar(
                  const SnackBar(content: Text('邮箱已复制到剪贴板')),
                );
              }
            },
            child: const Text('复制邮箱'),
          ),
        ],
      ),
    );
  }

  void _showFeedbackDialog({required bool isBug}) {
    final ctrl = TextEditingController();
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text(isBug ? '反馈 Bug' : '功能建议'),
        content: SizedBox(
          width: 400,
          child: TextField(
            controller: ctrl,
            maxLines: 6,
            decoration: InputDecoration(
              hintText: isBug
                  ? '请描述问题的复现步骤和预期行为…'
                  : '请描述您希望增加的功能…',
              border: const OutlineInputBorder(),
            ),
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('取消'),
          ),
          ElevatedButton(
            onPressed: () async {
              final subject = Uri.encodeComponent(isBug ? 'Bug反馈' : '功能建议');
              final body = Uri.encodeComponent(ctrl.text);
              final uri = Uri.parse(
                  'mailto:support@jiu.example.com?subject=$subject&body=$body');
              if (await canLaunchUrl(uri)) launchUrl(uri);
              if (ctx.mounted) Navigator.pop(ctx);
            },
            child: const Text('通过邮件发送'),
          ),
        ],
      ),
    );
  }

  void _showEditParamDialog(
      String label, String current, ValueChanged<String> onSave) {
    final ctrl = TextEditingController(text: current);
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text('修改$label'),
        content: SizedBox(
          width: 320,
          child: TextField(
            controller: ctrl,
            autofocus: true,
            decoration: InputDecoration(labelText: label),
          ),
        ),
        actions: [
          TextButton(
              onPressed: () => Navigator.of(ctx).pop(),
              child: const Text('取消')),
          ElevatedButton(
            onPressed: () {
              final v = ctrl.text.trim();
              if (v.isNotEmpty) onSave(v);
              Navigator.of(ctx).pop();
            },
            child: const Text('确定'),
          ),
        ],
      ),
    );
  }

  void _showAddUserDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (ctx) => _UserFormDialog(
        onSaved: () => ref.read(userListProvider.notifier).reload(),
      ),
    );
  }

  void _showEditUserDialog(BuildContext context, AppUser user) {
    showDialog(
      context: context,
      builder: (ctx) => _UserFormDialog(
        user: user,
        onSaved: () => ref.read(userListProvider.notifier).reload(),
      ),
    );
  }

  void _showResetPasswordDialog(BuildContext context, AppUser user) {
    showDialog(
      context: context,
      builder: (ctx) => _ResetPasswordDialog(user: user),
    );
  }
}

class _WarehouseFormDialog extends ConsumerStatefulWidget {
  final Warehouse? warehouse;
  final VoidCallback onSaved;

  const _WarehouseFormDialog({this.warehouse, required this.onSaved});

  @override
  ConsumerState<_WarehouseFormDialog> createState() =>
      _WarehouseFormDialogState();
}

class _WarehouseFormDialogState extends ConsumerState<_WarehouseFormDialog> {
  final _formKey = GlobalKey<FormState>();
  late final TextEditingController _nameCtrl;
  late final TextEditingController _locationCtrl;
  late bool _isDefault;
  bool _saving = false;

  @override
  void initState() {
    super.initState();
    _nameCtrl = TextEditingController(text: widget.warehouse?.name ?? '');
    _locationCtrl =
        TextEditingController(text: widget.warehouse?.location ?? '');
    _isDefault = widget.warehouse?.isDefault ?? false;
  }

  @override
  void dispose() {
    _nameCtrl.dispose();
    _locationCtrl.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _saving = true);
    final data = {
      'name': _nameCtrl.text.trim(),
      if (_locationCtrl.text.trim().isNotEmpty)
        'location': _locationCtrl.text.trim(),
      'is_default': _isDefault,
    };
    try {
      final notifier = ref.read(warehouseListProvider.notifier);
      if (widget.warehouse != null) {
        await notifier.updateWarehouse(widget.warehouse!.id, data);
      } else {
        await notifier.createWarehouse(data);
      }
      if (mounted) {
        Navigator.of(context).pop();
        widget.onSaved();
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(
                widget.warehouse != null ? '仓库更新成功' : '仓库创建成功'),
            backgroundColor: AppTheme.success,
          ),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
              content: Text('保存失败：$e'),
              backgroundColor: AppTheme.danger),
        );
      }
    } finally {
      if (mounted) setState(() => _saving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.warehouse != null ? '编辑仓库' : '新建仓库'),
      content: SizedBox(
        width: 400,
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextFormField(
                controller: _nameCtrl,
                decoration: const InputDecoration(labelText: '仓库名称'),
                validator: (v) =>
                    (v == null || v.isEmpty) ? '不能为空' : null,
              ),
              const SizedBox(height: 12),
              TextFormField(
                controller: _locationCtrl,
                decoration: const InputDecoration(labelText: '位置'),
              ),
              const SizedBox(height: 12),
              CheckboxListTile(
                title: const Text('设为默认仓库'),
                value: _isDefault,
                onChanged: (v) => setState(() => _isDefault = v ?? false),
                contentPadding: EdgeInsets.zero,
              ),
            ],
          ),
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('取消'),
        ),
        ElevatedButton(
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 16,
                  height: 16,
                  child: CircularProgressIndicator(
                      strokeWidth: 2, color: Colors.white))
              : const Text('保存'),
        ),
      ],
    );
  }
}

// ── 新增/编辑用户弹窗 ─────────────────────────────────────
class _UserFormDialog extends ConsumerStatefulWidget {
  final AppUser? user;
  final VoidCallback onSaved;
  const _UserFormDialog({this.user, required this.onSaved});

  @override
  ConsumerState<_UserFormDialog> createState() => _UserFormDialogState();
}

class _UserFormDialogState extends ConsumerState<_UserFormDialog> {
  final _formKey = GlobalKey<FormState>();
  late final TextEditingController _usernameCtrl;
  late final TextEditingController _realNameCtrl;
  late final TextEditingController _phoneCtrl;
  late final TextEditingController _passwordCtrl;
  late String _role;
  bool _saving = false;

  bool get _isEdit => widget.user != null;

  @override
  void initState() {
    super.initState();
    _usernameCtrl = TextEditingController(text: widget.user?.username ?? '');
    _realNameCtrl = TextEditingController(text: widget.user?.realName ?? '');
    _phoneCtrl = TextEditingController(text: widget.user?.phone ?? '');
    _passwordCtrl = TextEditingController();
    _role = widget.user?.role ?? 'operator';
  }

  @override
  void dispose() {
    _usernameCtrl.dispose();
    _realNameCtrl.dispose();
    _phoneCtrl.dispose();
    _passwordCtrl.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _saving = true);
    try {
      final notifier = ref.read(userListProvider.notifier);
      if (_isEdit) {
        await notifier.updateUser(widget.user!.id, {
          'real_name': _realNameCtrl.text.trim(),
          'phone': _phoneCtrl.text.trim(),
          'role': _role,
        });
      } else {
        await notifier.createUser({
          'username': _usernameCtrl.text.trim(),
          'password': _passwordCtrl.text,
          'real_name': _realNameCtrl.text.trim(),
          'phone': _phoneCtrl.text.trim(),
          'role': _role,
        });
      }
      if (mounted) {
        Navigator.of(context).pop();
        widget.onSaved();
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text(_isEdit ? '用户更新成功' : '用户创建成功'),
          backgroundColor: AppTheme.success,
        ));
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text('保存失败：$e'),
          backgroundColor: AppTheme.danger,
        ));
      }
    } finally {
      if (mounted) setState(() => _saving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(_isEdit ? '编辑用户' : '新增用户'),
      content: SizedBox(
        width: 400,
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              if (!_isEdit)
                TextFormField(
                  controller: _usernameCtrl,
                  decoration: const InputDecoration(labelText: '用户名'),
                  validator: (v) => (v == null || v.isEmpty) ? '不能为空' : null,
                ),
              if (!_isEdit) const SizedBox(height: 12),
              TextFormField(
                controller: _realNameCtrl,
                decoration: const InputDecoration(labelText: '姓名'),
              ),
              const SizedBox(height: 12),
              TextFormField(
                controller: _phoneCtrl,
                decoration: const InputDecoration(labelText: '手机号'),
              ),
              const SizedBox(height: 12),
              if (!_isEdit) ...[
                TextFormField(
                  controller: _passwordCtrl,
                  obscureText: true,
                  decoration: const InputDecoration(labelText: '初始密码'),
                  validator: (v) => (v == null || v.isEmpty) ? '不能为空' : null,
                ),
                const SizedBox(height: 12),
              ],
              DropdownButtonFormField<String>(
                value: _role,
                items: const [
                  DropdownMenuItem(value: 'admin', child: Text('管理员')),
                  DropdownMenuItem(value: 'operator', child: Text('操作员')),
                  DropdownMenuItem(value: 'readonly', child: Text('只读')),
                ],
                onChanged: (v) => setState(() => _role = v ?? 'operator'),
                decoration: const InputDecoration(labelText: '角色'),
              ),
            ],
          ),
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('取消'),
        ),
        ElevatedButton(
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 16, height: 16,
                  child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
              : const Text('保存'),
        ),
      ],
    );
  }
}

// ── 重置密码弹窗 ──────────────────────────────────────────
class _ResetPasswordDialog extends ConsumerStatefulWidget {
  final AppUser user;
  const _ResetPasswordDialog({required this.user});

  @override
  ConsumerState<_ResetPasswordDialog> createState() => _ResetPasswordDialogState();
}

class _ResetPasswordDialogState extends ConsumerState<_ResetPasswordDialog> {
  final _ctrl = TextEditingController();
  bool _saving = false;

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

  Future<void> _save() async {
    if (_ctrl.text.isEmpty) return;
    setState(() => _saving = true);
    try {
      await ref.read(userListProvider.notifier).resetPassword(widget.user.id, _ctrl.text);
      if (mounted) {
        Navigator.of(context).pop();
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
          content: Text('密码已重置'),
          backgroundColor: AppTheme.success,
        ));
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
          content: Text('重置失败：$e'),
          backgroundColor: AppTheme.danger,
        ));
      }
    } finally {
      if (mounted) setState(() => _saving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('重置密码 — ${widget.user.username}'),
      content: SizedBox(
        width: 360,
        child: TextField(
          controller: _ctrl,
          obscureText: true,
          decoration: const InputDecoration(labelText: '新密码'),
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('取消'),
        ),
        ElevatedButton(
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 16, height: 16,
                  child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
              : const Text('确认重置'),
        ),
      ],
    );
  }
}

class _RoleBadge extends StatelessWidget {
  final String role;
  const _RoleBadge(this.role);

  @override
  Widget build(BuildContext context) {
    final Color bg;
    final Color fg;
    switch (role) {
      case '管理员':
        bg = const Color(0xFFE3F2FD);
        fg = AppTheme.primary;
        break;
      case '操作员':
        bg = const Color(0xFFE8F5E9);
        fg = AppTheme.success;
        break;
      default:
        bg = const Color(0xFFF5F5F5);
        fg = AppTheme.textSecondary;
    }
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
      decoration: BoxDecoration(color: bg, borderRadius: BorderRadius.circular(3)),
      child: Text(role, style: TextStyle(color: fg, fontSize: 12, fontWeight: FontWeight.w500)),
    );
  }
}

class _ParamRow extends StatelessWidget {
  final String label;
  final String value;
  final bool? switchValue;
  final ValueChanged<bool>? onSwitchChanged;
  final VoidCallback? onEdit;

  const _ParamRow({
    required this.label,
    required this.value,
    this.switchValue,
    this.onSwitchChanged,
    this.onEdit,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        children: [
          SizedBox(
            width: 180,
            child: Text(label,
                style: const TextStyle(
                    fontSize: 14, color: AppTheme.textSecondary)),
          ),
          if (switchValue != null)
            Switch(
              value: switchValue!,
              onChanged: onSwitchChanged,
              materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
            )
          else
            Text(value,
                style: const TextStyle(
                    fontSize: 14, fontWeight: FontWeight.w500)),
          const Spacer(),
          if (onEdit != null)
            TextButton(
              onPressed: onEdit,
              child: const Text('修改', style: TextStyle(fontSize: 12)),
            ),
        ],
      ),
    );
  }
}

// ── 关于页辅助 widgets ──────────────────────────────────────

class _AboutSection extends StatelessWidget {
  final String title;
  final List<Widget> children;
  const _AboutSection({required this.title, required this.children});

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(title,
                style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: AppTheme.primaryDark)),
            const Divider(height: 24),
            ...children,
          ],
        ),
      ),
    );
  }
}

class _AboutRow extends StatelessWidget {
  final String label;
  final String value;
  final Color? valueColor;
  final Widget? trailing;

  const _AboutRow({
    required this.label,
    required this.value,
    this.valueColor,
    this.trailing,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          SizedBox(
            width: 88,
            child: Text(label,
                style: const TextStyle(
                    fontSize: 13, color: AppTheme.textSecondary)),
          ),
          Expanded(
            child: Text(value,
                style: TextStyle(
                    fontSize: 13,
                    color: valueColor ?? AppTheme.textPrimary,
                    fontWeight: FontWeight.w500)),
          ),
          if (trailing != null) trailing!,
        ],
      ),
    );
  }
}

// ── 批量数据导入 ───────────────────────────────────────────

class _ImportSlot {
  final String title;
  final String endpoint;
  final String hint;
  PlatformFile? file;
  // null = 未运行；true = 成功；false = 失败
  bool? success;
  String? error;
  int total = 0;
  int imported = 0;
  int skipped = 0;

  _ImportSlot(this.title, this.endpoint, this.hint);

  bool get hasResult => success != null;
}

class _BatchImportWidget extends ConsumerStatefulWidget {
  const _BatchImportWidget();

  @override
  ConsumerState<_BatchImportWidget> createState() => _BatchImportWidgetState();
}

class _BatchImportWidgetState extends ConsumerState<_BatchImportWidget> {
  bool _loading = false;
  String? _lastDir;

  static const _prefKey = 'import_last_dir';

  late final List<_ImportSlot> _slots = [
    _ImportSlot('往来单位', '/import/partners',
        '格式：编号 | 类型 | 状态 | 名称 | 电话 | 卡号 | 初始金额 | 单位 | 地址 | 备注'),
    _ImportSlot('商品名称', '/import/product-names',
        '格式：选项编号 | 选项名称 | 备注'),
    _ImportSlot('商品系列', '/import/product-series',
        '格式：选项编号 | 选项名称 | 备注'),
    _ImportSlot('商品规格', '/import/product-specs',
        '格式：选项编号 | 选项名称 | 单品数量 | 备注'),
  ];

  @override
  void initState() {
    super.initState();
    SharedPreferences.getInstance().then((prefs) {
      final dir = prefs.getString(_prefKey);
      if (dir != null && mounted) setState(() => _lastDir = dir);
    });
  }

  Future<void> _pickFile(int index) async {
    final result = await FilePicker.platform.pickFiles(
      type: FileType.custom,
      allowedExtensions: ['xls', 'xlsx'],
      withData: true,
      initialDirectory: _lastDir,
    );
    if (result == null) return;

    // 保存目录供下次使用
    final path = result.files.first.path;
    if (path != null) {
      final dir = path.contains('/') ? path.substring(0, path.lastIndexOf('/')) : null;
      if (dir != null) {
        _lastDir = dir;
        SharedPreferences.getInstance().then((p) => p.setString(_prefKey, dir));
      }
    }

    setState(() {
      _slots[index].file = result.files.first;
      _slots[index].success = null;
      _slots[index].error = null;
    });
  }

  Future<void> _runImport() async {
    final token = ref.read(authStateProvider).user?.accessToken ?? '';
    if (!_slots.any((s) => s.file != null)) return;

    setState(() {
      _loading = true;
      for (final s in _slots) {
        if (s.file != null) {
          s.success = null;
          s.error = null;
        }
      }
    });

    final dio = Dio(BaseOptions(baseUrl: AppConfig.apiBaseUrl));
    dio.options.headers['Authorization'] = 'Bearer $token';

    for (final slot in _slots) {
      if (slot.file == null) continue;
      final bytes = slot.file!.bytes;
      if (bytes == null) {
        if (mounted) setState(() { slot.success = false; slot.error = '无法读取文件'; });
        continue;
      }
      try {
        final formData = FormData.fromMap({
          'file': MultipartFile.fromBytes(bytes, filename: slot.file!.name),
        });
        final resp = await dio.post(slot.endpoint, data: formData);
        final data = (resp.data is Map) ? resp.data as Map<String, dynamic> : <String, dynamic>{};
        if (mounted) setState(() {
          slot.success = true;
          slot.total = (data['total'] ?? data['imported'] ?? 0) as int;
          slot.imported = (data['imported'] ?? 0) as int;
          slot.skipped = (data['skipped'] ?? 0) as int;
        });
      } on DioException catch (e) {
        final raw = e.response?.data;
        final msg = (raw is Map ? raw['error'] : null) ?? e.message ?? '未知错误';
        if (mounted) setState(() {
          slot.success = false;
          slot.error = msg.toString();
        });
      } catch (e) {
        if (mounted) setState(() {
          slot.success = false;
          slot.error = e.toString();
        });
      }
    }

    if (mounted) setState(() => _loading = false);
  }

  @override
  Widget build(BuildContext context) {
    final hasAnyFile = _slots.any((s) => s.file != null);
    final ran = _slots.where((s) => s.file != null && s.hasResult).toList();
    final allDone = !_loading && ran.length == _slots.where((s) => s.file != null).length && ran.isNotEmpty;
    final failCount = ran.where((s) => s.success == false).length;

    return SingleChildScrollView(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const Text('数据导入',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
          const SizedBox(height: 4),
          const Text(
            '选择对应的 Excel 文件后点击「全部导入」，系统将依次导入，按名称去重（已存在的数据不重复导入）。',
            style: TextStyle(fontSize: 13, color: AppTheme.textSecondary),
          ),
          const SizedBox(height: 20),
          Card(
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
              child: Column(
                children: [
                  for (int i = 0; i < _slots.length; i++) ...[
                    _buildSlotRow(i),
                    if (i < _slots.length - 1)
                      const Divider(height: 1),
                  ],
                ],
              ),
            ),
          ),
          const SizedBox(height: 16),
          Row(
            children: [
              ElevatedButton.icon(
                onPressed: (_loading || !hasAnyFile) ? null : _runImport,
                icon: _loading
                    ? const SizedBox(
                        width: 14, height: 14,
                        child: CircularProgressIndicator(
                            strokeWidth: 2, color: Colors.white))
                    : const Icon(Icons.upload_rounded, size: 16),
                label: Text(_loading ? '导入中...' : '全部导入'),
              ),
              const SizedBox(width: 16),
              if (allDone) ...[
                Icon(
                  failCount == 0
                      ? Icons.check_circle_outline
                      : Icons.warning_amber_rounded,
                  size: 16,
                  color: failCount == 0 ? AppTheme.success : Colors.orange,
                ),
                const SizedBox(width: 4),
                Text(
                  failCount == 0 ? '全部导入完成' : '$failCount 项失败，请检查错误信息',
                  style: TextStyle(
                    fontSize: 13,
                    color: failCount == 0 ? AppTheme.success : Colors.orange,
                  ),
                ),
              ],
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildSlotRow(int index) {
    final slot = _slots[index];

    Widget? statusWidget;
    if (slot.hasResult) {
      if (slot.success == true) {
        final parts = <String>[
          '共 ${slot.total} 条',
          '新增 ${slot.imported} 条',
          if (slot.skipped > 0) '重复跳过 ${slot.skipped} 条',
        ];
        statusWidget = Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.check_circle_outline, size: 15, color: AppTheme.success),
            const SizedBox(width: 4),
            Text(
              parts.join('，'),
              style: const TextStyle(fontSize: 13, color: AppTheme.success),
            ),
          ],
        );
      } else {
        statusWidget = Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.error_outline, size: 15, color: AppTheme.danger),
            const SizedBox(width: 4),
            Text(
              slot.error ?? '未知错误',
              style: const TextStyle(fontSize: 13, color: AppTheme.danger),
            ),
          ],
        );
      }
    } else if (_loading && slot.file != null) {
      statusWidget = const SizedBox(
        width: 14, height: 14,
        child: CircularProgressIndicator(strokeWidth: 2),
      );
    }

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 12),
      child: Row(
        children: [
          SizedBox(
            width: 68,
            child: Text(slot.title,
                style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w500)),
          ),
          const SizedBox(width: 12),
          OutlinedButton(
            onPressed: _loading ? null : () => _pickFile(index),
            style: OutlinedButton.styleFrom(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
              minimumSize: Size.zero,
              tapTargetSize: MaterialTapTargetSize.shrinkWrap,
            ),
            child: const Text('选择文件', style: TextStyle(fontSize: 13)),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Text(
              slot.file?.name ?? '未选择',
              style: TextStyle(
                fontSize: 13,
                color: slot.file != null ? AppTheme.textPrimary : AppTheme.textSecondary,
              ),
              overflow: TextOverflow.ellipsis,
            ),
          ),
          const SizedBox(width: 12),
          if (statusWidget != null) statusWidget,
        ],
      ),
    );
  }
}