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

import '../../../../core/constants/route_constants.dart';
import '../../../../shared/widgets/app_button.dart';
import '../../../../shared/widgets/app_text_field.dart';
import '../../domain/entities/app_settings.dart';
import '../providers/settings_provider.dart';
import '../widgets/settings_widgets.dart';
import '../../../../shared/widgets/app_toast.dart';

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

  @override
  ConsumerState<SecuritySettingsScreen> createState() =>
      _SecuritySettingsScreenState();
}

class _SecuritySettingsScreenState extends ConsumerState<SecuritySettingsScreen> {
  final _formKey = GlobalKey<FormState>();
  late final TextEditingController _minPasswordController;
  late final TextEditingController _passwordExpiryController;
  late final TextEditingController _sessionTimeoutController;
  late final TextEditingController _loginAttemptController;
  late final TextEditingController _lockDurationController;
  late final TextEditingController _ipWhitelistController;
  late bool _otpEnabled;
  late bool _mfaEnabled;
  late bool _autoLogout;
  late bool _concurrentLogin;
  late bool _auditLogging;

  @override
  void initState() {
    super.initState();
    final security = ref.read(appSettingsProvider).security;
    _minPasswordController =
        TextEditingController(text: '${security.minPasswordLength}');
    _passwordExpiryController =
        TextEditingController(text: '${security.passwordExpiryDays}');
    _sessionTimeoutController =
        TextEditingController(text: '${security.sessionTimeoutMinutes}');
    _loginAttemptController =
        TextEditingController(text: '${security.loginAttemptLimit}');
    _lockDurationController =
        TextEditingController(text: '${security.accountLockDurationMinutes}');
    _ipWhitelistController = TextEditingController(text: security.ipWhitelist);
    _otpEnabled = security.otpEnabled;
    _mfaEnabled = security.mfaEnabled;
    _autoLogout = security.autoLogout;
    _concurrentLogin = security.concurrentLoginControl;
    _auditLogging = security.auditLoggingEnabled;
  }

  @override
  void dispose() {
    _minPasswordController.dispose();
    _passwordExpiryController.dispose();
    _sessionTimeoutController.dispose();
    _loginAttemptController.dispose();
    _lockDurationController.dispose();
    _ipWhitelistController.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    if (!_formKey.currentState!.validate()) return;

    await ref.read(appSettingsProvider.notifier).updateSecurity(
          SecuritySettingsConfig(
            minPasswordLength: int.parse(_minPasswordController.text.trim()),
            passwordExpiryDays: int.parse(_passwordExpiryController.text.trim()),
            otpEnabled: _otpEnabled,
            mfaEnabled: _mfaEnabled,
            sessionTimeoutMinutes:
                int.parse(_sessionTimeoutController.text.trim()),
            autoLogout: _autoLogout,
            concurrentLoginControl: _concurrentLogin,
            loginAttemptLimit: int.parse(_loginAttemptController.text.trim()),
            accountLockDurationMinutes:
                int.parse(_lockDurationController.text.trim()),
            auditLoggingEnabled: _auditLogging,
            ipWhitelist: _ipWhitelistController.text.trim(),
          ),
        );

    if (mounted) {
      showAppToastFromSnackBar(context, 
        const SnackBar(content: Text('Security settings saved')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return SettingsPageLayout(
      title: 'Security Settings',
      subtitle: 'Authentication, session, and audit policies',
      actions: [
        TextButton.icon(
          onPressed: () => context.push(RouteConstants.changePassword),
          icon: const Icon(Icons.password),
          label: const Text('Change Password'),
        ),
      ],
      child: Form(
        key: _formKey,
        child: Column(
          children: [
            SettingsFormCard(
              title: 'Authentication',
              children: [
                AppTextField(
                  controller: _minPasswordController,
                  label: 'Minimum Password Length',
                  keyboardType: TextInputType.number,
                ),
                const SizedBox(height: 16),
                AppTextField(
                  controller: _passwordExpiryController,
                  label: 'Password Expiry Days',
                  keyboardType: TextInputType.number,
                ),
                SettingsSwitchTile(
                  title: 'OTP Enable/Disable',
                  value: _otpEnabled,
                  onChanged: (v) => setState(() => _otpEnabled = v),
                ),
                SettingsSwitchTile(
                  title: 'MFA Enable/Disable',
                  value: _mfaEnabled,
                  onChanged: (v) => setState(() => _mfaEnabled = v),
                ),
              ],
            ),
            const SizedBox(height: 16),
            SettingsFormCard(
              title: 'Session Settings',
              children: [
                AppTextField(
                  controller: _sessionTimeoutController,
                  label: 'Session Timeout (Minutes)',
                  keyboardType: TextInputType.number,
                ),
                SettingsSwitchTile(
                  title: 'Auto Logout',
                  value: _autoLogout,
                  onChanged: (v) => setState(() => _autoLogout = v),
                ),
                SettingsSwitchTile(
                  title: 'Concurrent Login Control',
                  value: _concurrentLogin,
                  onChanged: (v) => setState(() => _concurrentLogin = v),
                ),
              ],
            ),
            const SizedBox(height: 16),
            SettingsFormCard(
              title: 'Security Policies',
              children: [
                AppTextField(
                  controller: _loginAttemptController,
                  label: 'Login Attempt Limit',
                  keyboardType: TextInputType.number,
                ),
                const SizedBox(height: 16),
                AppTextField(
                  controller: _lockDurationController,
                  label: 'Account Lock Duration (Minutes)',
                  keyboardType: TextInputType.number,
                ),
                const SizedBox(height: 16),
                AppTextField(
                  controller: _ipWhitelistController,
                  label: 'IP Whitelist',
                  hint: '192.168.1.1, 10.0.0.0/24',
                  maxLines: 2,
                ),
                SettingsSwitchTile(
                  title: 'Audit Logging',
                  subtitle: 'Track login, asset changes, and allocations',
                  value: _auditLogging,
                  onChanged: (v) => setState(() => _auditLogging = v),
                ),
              ],
            ),
            const SizedBox(height: 24),
            AppButton(label: 'Save Changes', onPressed: _save),
          ],
        ),
      ),
    );
  }
}