import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../providers/dashboard_providers.dart';
import '../../../widgets/error_view.dart';

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

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(brandSettingsProvider);

    return Scaffold(
      appBar: AppBar(title: const Text('Brand Settings')),
      body: async.when(
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (e, _) => ErrorView(
          message: 'Failed to load settings',
          onRetry: () => ref.invalidate(brandSettingsProvider),
        ),
        data: (settings) => _SettingsForm(settings: settings),
      ),
    );
  }
}

class _SettingsForm extends ConsumerStatefulWidget {
  final dynamic settings;

  const _SettingsForm({required this.settings});

  @override
  ConsumerState<_SettingsForm> createState() => _SettingsFormState();
}

class _SettingsFormState extends ConsumerState<_SettingsForm> {
  final _formKey = GlobalKey<FormState>();
  bool _loading = false;

  late final _displayName =
      TextEditingController(text: widget.settings.displayName as String);
  late final _tagline =
      TextEditingController(text: widget.settings.tagline as String?);
  late final _email =
      TextEditingController(text: widget.settings.publicEmail as String?);
  late final _phone =
      TextEditingController(text: widget.settings.publicPhone as String?);
  late final _city =
      TextEditingController(text: widget.settings.publicCity as String?);
  late final _country =
      TextEditingController(text: widget.settings.publicCountry as String?);
  late final _website =
      TextEditingController(text: widget.settings.websiteUrl as String?);
  late final _whatsapp =
      TextEditingController(text: widget.settings.whatsappNumber as String?);
  late bool _listed = widget.settings.isListedOnMarketplace as bool;

  @override
  void dispose() {
    for (final c in [
      _displayName, _tagline, _email, _phone, _city, _country, _website, _whatsapp
    ]) {
      c.dispose();
    }
    super.dispose();
  }

  Future<void> _submit() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _loading = true);
    try {
      await ref.read(settingsServiceProvider).updateBrand({
        'displayName': _displayName.text.trim(),
        if (_tagline.text.isNotEmpty) 'tagline': _tagline.text.trim(),
        if (_email.text.isNotEmpty) 'publicEmail': _email.text.trim(),
        if (_phone.text.isNotEmpty) 'publicPhone': _phone.text.trim(),
        if (_city.text.isNotEmpty) 'publicCity': _city.text.trim(),
        if (_country.text.isNotEmpty) 'publicCountry': _country.text.trim(),
        if (_website.text.isNotEmpty) 'websiteUrl': _website.text.trim(),
        if (_whatsapp.text.isNotEmpty) 'whatsappNumber': _whatsapp.text.trim(),
        'isListedOnMarketplace': _listed,
      });
      ref.invalidate(brandSettingsProvider);
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Settings saved')));
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context)
            .showSnackBar(SnackBar(content: Text('Error: $e')));
      }
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          _section('Brand', [
            _field('Display Name', _displayName, required: true),
            _field('Tagline', _tagline),
          ]),
          const SizedBox(height: 16),
          _section('Contact', [
            _field('Public Email', _email,
                inputType: TextInputType.emailAddress),
            _field('Public Phone', _phone, inputType: TextInputType.phone),
            _field('WhatsApp Number', _whatsapp,
                inputType: TextInputType.phone),
            _field('Website URL', _website, inputType: TextInputType.url),
          ]),
          const SizedBox(height: 16),
          _section('Location', [
            _field('City', _city),
            _field('Country', _country),
          ]),
          const SizedBox(height: 16),
          Card(
            child: SwitchListTile(
              title: const Text('Listed on Marketplace'),
              subtitle: const Text(
                'Show your fleet on the public marketplace',
              ),
              value: _listed,
              onChanged: (v) => setState(() => _listed = v),
            ),
          ),
          const SizedBox(height: 24),
          ElevatedButton(
            onPressed: _loading ? null : _submit,
            style: ElevatedButton.styleFrom(
              minimumSize: const Size.fromHeight(48),
            ),
            child: _loading
                ? const SizedBox(
                    width: 20,
                    height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2))
                : const Text('Save Settings'),
          ),
        ],
      ),
    );
  }

  Widget _section(String title, List<Widget> children) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(title,
            style: const TextStyle(
                fontSize: 13,
                fontWeight: FontWeight.w600,
                color: Color(0xFF6B7280))),
        const SizedBox(height: 10),
        Card(
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            child: Column(children: children),
          ),
        ),
      ],
    );
  }

  Widget _field(String label, TextEditingController ctrl,
      {bool required = false, TextInputType? inputType}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: TextFormField(
        controller: ctrl,
        keyboardType: inputType,
        decoration: InputDecoration(labelText: label),
        validator: required
            ? (v) => v == null || v.isEmpty ? 'Required' : null
            : null,
      ),
    );
  }
}