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

import '../../../../core/network/api_handler.dart';
import '../../../../core/utils/validators.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 EmailConfigurationScreen extends ConsumerStatefulWidget {
  const EmailConfigurationScreen({super.key});

  @override
  ConsumerState<EmailConfigurationScreen> createState() =>
      _EmailConfigurationScreenState();
}

class _EmailConfigurationScreenState
    extends ConsumerState<EmailConfigurationScreen> {
  final _formKey = GlobalKey<FormState>();
  late final TextEditingController _hostController;
  late final TextEditingController _portController;
  late final TextEditingController _usernameController;
  late final TextEditingController _passwordController;
  late final TextEditingController _senderEmailController;
  late final TextEditingController _senderNameController;

  bool _loading = true;
  bool _saving = false;

  @override
  void initState() {
    super.initState();
    final email = ref.read(appSettingsProvider).email;
    _hostController = TextEditingController(text: email.smtpHost);
    _portController = TextEditingController(text: '${email.smtpPort}');
    _usernameController = TextEditingController(text: email.smtpUsername);
    _passwordController = TextEditingController(text: email.smtpPassword);
    _senderEmailController = TextEditingController(text: email.senderEmail);
    _senderNameController = TextEditingController(text: email.senderName);
    WidgetsBinding.instance.addPostFrameCallback((_) => _loadFromApi());
  }

  Future<void> _loadFromApi() async {
    setState(() => _loading = true);
    final failure =
        await ref.read(appSettingsProvider.notifier).refreshEmailSettings();
    if (!mounted) return;
    _applyEmail(ref.read(appSettingsProvider).email);
    setState(() => _loading = false);
    if (failure != null) {
      showAppToastFromSnackBar(context, 
        SnackBar(
          content: Text(failure.message),
          backgroundColor: Theme.of(context).colorScheme.error,
        ),
      );
    }
  }

  void _applyEmail(EmailConfigurationSettings email) {
    _hostController.text = email.smtpHost;
    _portController.text = '${email.smtpPort}';
    _usernameController.text = email.smtpUsername;
    if (email.smtpPassword.isNotEmpty) {
      _passwordController.text = email.smtpPassword;
    }
    _senderEmailController.text = email.senderEmail;
    _senderNameController.text = email.senderName;
  }

  @override
  void dispose() {
    _hostController.dispose();
    _portController.dispose();
    _usernameController.dispose();
    _passwordController.dispose();
    _senderEmailController.dispose();
    _senderNameController.dispose();
    super.dispose();
  }

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

    final port = int.tryParse(_portController.text.trim());
    if (port == null || port <= 0) {
      showAppToastFromSnackBar(context, 
        const SnackBar(content: Text('Enter a valid SMTP port')),
      );
      return;
    }

    final current = ref.read(appSettingsProvider).email;
    setState(() => _saving = true);
    final failure = await ref.read(appSettingsProvider.notifier).updateEmail(
          current.copyWith(
            smtpHost: _hostController.text.trim(),
            smtpPort: port,
            smtpUsername: _usernameController.text.trim(),
            smtpPassword: _passwordController.text.trim(),
            senderEmail: _senderEmailController.text.trim(),
            senderName: _senderNameController.text.trim(),
          ),
        );
    if (!mounted) return;
    setState(() => _saving = false);

    if (failure != null) {
      showAppToastFromSnackBar(context, 
        SnackBar(
          content: Text(validationErrorMessage(failure)),
          backgroundColor: Theme.of(context).colorScheme.error,
        ),
      );
      return;
    }

    showAppToastFromSnackBar(context, 
      const SnackBar(content: Text('Email configuration saved')),
    );
  }

  @override
  Widget build(BuildContext context) {
    return SettingsPageLayout(
      title: 'Email Configuration',
      subtitle: 'SMTP server settings',
      child: _loading
          ? const Padding(
              padding: EdgeInsets.symmetric(vertical: 48),
              child: Center(child: CircularProgressIndicator()),
            )
          : Form(
              key: _formKey,
              child: Column(
                children: [
                  SettingsFormCard(
                    title: 'SMTP Settings',
                    children: [
                      AppTextField(
                        controller: _hostController,
                        label: 'SMTP Host',
                        hint: 'smtp.gmail.com',
                        validator: (v) =>
                            Validators.required(v, fieldName: 'SMTP Host'),
                      ),
                      const SizedBox(height: 16),
                      AppTextField(
                        controller: _portController,
                        label: 'SMTP Port',
                        keyboardType: TextInputType.number,
                        validator: (v) =>
                            Validators.required(v, fieldName: 'SMTP Port'),
                      ),
                      const SizedBox(height: 16),
                      AppTextField(
                        controller: _usernameController,
                        label: 'Username',
                      ),
                      const SizedBox(height: 16),
                      AppTextField(
                        controller: _passwordController,
                        label: 'Password',
                        obscureText: true,
                        hint: 'Leave blank to keep existing password',
                      ),
                      const SizedBox(height: 16),
                      AppTextField(
                        controller: _senderEmailController,
                        label: 'Sender Email',
                        keyboardType: TextInputType.emailAddress,
                        validator: Validators.email,
                      ),
                      const SizedBox(height: 16),
                      AppTextField(
                        controller: _senderNameController,
                        label: 'Sender Name',
                      ),
                    ],
                  ),
                  const SizedBox(height: 24),
                  AppButton(
                    label: 'Save Changes',
                    onPressed: _save,
                    isLoading: _saving,
                  ),
                ],
              ),
            ),
    );
  }
}