import 'package:flutter/material.dart';
import 'package:package_info_plus/package_info_plus.dart';
import '../../../../app/theme/app_colors.dart';
import '../../../../app/router.dart';
import '../../../../app/i18n/app_localizations.dart';
import '../../../../core/updater/update_service.dart';
import '../../../../core/services/issuer_service.dart';
import '../../../../core/services/auth_service.dart';
import '../../../../core/network/api_client.dart';
import '../../../../core/telemetry/telemetry_service.dart';

/// 发行方设置页面（我的）
///
/// 企业信息、门店管理、员工管理、专属客服、安全设置
class SettingsPage extends StatefulWidget {
  const SettingsPage({super.key});

  @override
  State<SettingsPage> createState() => _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {
  String _appVersion = '';
  bool _isLoadingProfile = true;
  IssuerProfile? _profile;
  bool _isLoggingOut = false;

  final _issuerService = IssuerService();
  final _authService = AuthService();

  @override
  void initState() {
    super.initState();
    _loadVersion();
    _loadProfile();
  }

  Future<void> _loadVersion() async {
    final info = await PackageInfo.fromPlatform();
    if (mounted) {
      setState(() => _appVersion = 'v${info.version}+${info.buildNumber}');
    }
  }

  Future<void> _loadProfile() async {
    try {
      final profile = await _issuerService.getProfile();
      if (!mounted) return;
      setState(() {
        _profile = profile;
        _isLoadingProfile = false;
      });
    } catch (e) {
      debugPrint('[SettingsPage] loadProfile error: $e');
      if (!mounted) return;
      setState(() => _isLoadingProfile = false);
    }
  }

  Future<void> _handleLogout() async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text(context.t('settings_confirm_logout')),
        content: Text(context.t('settings_confirm_logout_desc')),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: Text(context.t('cancel'))),
          ElevatedButton(
            onPressed: () => Navigator.pop(ctx, true),
            style: ElevatedButton.styleFrom(backgroundColor: AppColors.error),
            child: Text(context.t('confirm')),
          ),
        ],
      ),
    );

    if (confirmed != true) return;

    setState(() => _isLoggingOut = true);

    try {
      await _authService.logout();
    } catch (e) {
      debugPrint('[SettingsPage] logout error: $e');
    }

    // 遥测：退出登录时清除 userId 和 token
    if (TelemetryService().isInitialized) {
      TelemetryService().clearUserId();
      TelemetryService().clearAccessToken();
    }
    ApiClient.instance.setToken(null);

    if (!mounted) return;
    Navigator.pushNamedAndRemoveUntil(context, AppRouter.login, (_) => false);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(context.t('settings_title'))),
      body: SingleChildScrollView(
        child: Column(
          children: [
            // Profile Card
            _buildProfileCard(context),

            // Tier & Benefits
            _buildTierCard(context),

            const SizedBox(height: 8),

            // Menu Groups
            _buildMenuGroup(context.t('settings_group_company'), [
              _MenuItem(context.t('settings_company_info'), Icons.business_rounded, () {
                // TODO: Navigate to company info page when available
              }),
              _MenuItem(context.t('settings_store_mgmt'), Icons.store_rounded, () {
                Navigator.pushNamed(context, AppRouter.storeManagement);
              }),
              _MenuItem(context.t('settings_employee_mgmt'), Icons.people_rounded, () {
                Navigator.pushNamed(context, AppRouter.storeManagement);
              }),
              _MenuItem(context.t('settings_permissions'), Icons.admin_panel_settings_rounded, () {
                // TODO: Navigate to permissions page when available
              }),
            ]),

            _buildMenuGroup(context.t('settings_group_support'), [
              _MenuItem(context.t('settings_ai_assistant'), Icons.auto_awesome_rounded, () {
                Navigator.pushNamed(context, AppRouter.aiAgent);
              }),
              _MenuItem(context.t('settings_customer_service'), Icons.headset_mic_rounded, () {
                // TODO: Navigate to customer service page when available
              }),
              _MenuItem(context.t('settings_help_center'), Icons.help_outline_rounded, () {
                // TODO: Navigate to help center page when available
              }),
              _MenuItem(context.t('settings_feedback'), Icons.feedback_rounded, () {
                // TODO: Navigate to feedback page when available
              }),
            ]),

            _buildMenuGroup(context.t('settings_group_security'), [
              _MenuItem(context.t('settings_change_password'), Icons.lock_outline_rounded, () {
                // TODO: Navigate to change password page when available
              }),
              _MenuItem(context.t('settings_operation_log'), Icons.history_rounded, () {
                // TODO: Navigate to operation log page when available
              }),
              _MenuItem(
                '${context.t('settings_about')}${_appVersion.isNotEmpty ? '  $_appVersion' : ''}',
                Icons.info_outline_rounded,
                () => UpdateService().manualCheckUpdate(context),
              ),
            ]),

            // Logout
            Padding(
              padding: const EdgeInsets.all(20),
              child: SizedBox(
                width: double.infinity,
                child: OutlinedButton(
                  onPressed: _isLoggingOut ? null : _handleLogout,
                  style: OutlinedButton.styleFrom(
                    foregroundColor: AppColors.error,
                    side: const BorderSide(color: AppColors.error),
                  ),
                  child: _isLoggingOut
                      ? const SizedBox(
                          width: 20,
                          height: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : Text(context.t('settings_logout')),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildProfileCard(BuildContext context) {
    return Container(
      padding: const EdgeInsets.fromLTRB(20, 20, 20, 16),
      color: AppColors.surface,
      child: Row(
        children: [
          _profile?.logoUrl != null
              ? ClipRRect(
                  borderRadius: BorderRadius.circular(14),
                  child: Image.network(
                    _profile!.logoUrl!,
                    width: 56,
                    height: 56,
                    fit: BoxFit.cover,
                    errorBuilder: (_, __, ___) => ClipRRect(
                      borderRadius: BorderRadius.circular(14),
                      child: Image.asset('assets/images/logo_icon.png', width: 56, height: 56),
                    ),
                  ),
                )
              : ClipRRect(
                  borderRadius: BorderRadius.circular(14),
                  child: Image.asset(
                    'assets/images/logo_icon.png',
                    width: 56,
                    height: 56,
                  ),
                ),
          const SizedBox(width: 14),
          Expanded(
            child: _isLoadingProfile
                ? const Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      SizedBox(
                        width: 120,
                        height: 16,
                        child: LinearProgressIndicator(),
                      ),
                      SizedBox(height: 8),
                      SizedBox(
                        width: 80,
                        height: 12,
                        child: LinearProgressIndicator(),
                      ),
                    ],
                  )
                : Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        _profile?.companyName ?? '--',
                        style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        _profile?.contactEmail != null
                            ? '${context.t('settings_admin')}：${_profile!.contactEmail}'
                            : _profile?.contactPhone != null
                                ? '${context.t('settings_admin')}：${_profile!.contactPhone}'
                                : context.t('settings_admin'),
                        style: const TextStyle(fontSize: 13, color: AppColors.textSecondary),
                      ),
                    ],
                  ),
          ),
          const Icon(Icons.chevron_right_rounded, color: AppColors.textTertiary),
        ],
      ),
    );
  }

  Widget _buildTierCard(BuildContext context) {
    return Container(
      margin: const EdgeInsets.fromLTRB(20, 12, 20, 0),
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          colors: [Color(0xFFFFF7E6), Color(0xFFFFECC7)],
        ),
        borderRadius: BorderRadius.circular(12),
      ),
      child: Row(
        children: [
          const Icon(Icons.star_rounded, color: AppColors.tierGold, size: 28),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  _profile?.creditRating != null
                      ? '${_profile!.creditRating} ${context.t('settings_gold_issuer')}'
                      : context.t('settings_gold_issuer'),
                  style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w700, color: AppColors.tierGold),
                ),
                Text(context.t('settings_tier_benefits'), style: const TextStyle(fontSize: 12, color: AppColors.textSecondary)),
              ],
            ),
          ),
          TextButton(
            onPressed: () {
              Navigator.pushNamed(context, AppRouter.credit);
            },
            child: Text(context.t('settings_upgrade'), style: const TextStyle(color: AppColors.tierGold)),
          ),
        ],
      ),
    );
  }

  Widget _buildMenuGroup(String title, List<_MenuItem> items) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Padding(
          padding: const EdgeInsets.fromLTRB(20, 20, 20, 8),
          child: Text(title, style: const TextStyle(fontSize: 13, color: AppColors.textTertiary, fontWeight: FontWeight.w500)),
        ),
        Container(
          color: AppColors.surface,
          child: Column(
            children: items.map((item) {
              return ListTile(
                leading: Icon(item.icon, color: AppColors.textSecondary, size: 22),
                title: Text(item.title, style: const TextStyle(fontSize: 15)),
                trailing: const Icon(Icons.chevron_right_rounded, size: 20, color: AppColors.textTertiary),
                onTap: item.onTap,
              );
            }).toList(),
          ),
        ),
      ],
    );
  }
}

class _MenuItem {
  final String title;
  final IconData icon;
  final VoidCallback onTap;

  const _MenuItem(this.title, this.icon, this.onTap);
}