import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../config/app_config.dart';
import '../utils/farb_theme.dart';
import 'cloud_screen.dart';
import '../services/cloud_service.dart';

/// Vollwertiger Einstellungen-Screen – kein Popup mehr
class SettingsScreen extends StatefulWidget {
  const SettingsScreen({super.key});

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

class _SettingsScreenState extends State<SettingsScreen> {
  bool _diagnose = AppConfig.sendeDiagnosedaten;

  @override
  void initState() {
    super.initState();
    _ladeDiagnose();
  }

  Future<void> _ladeDiagnose() async {
    final p = await SharedPreferences.getInstance();
    if (mounted) setState(() => _diagnose = p.getBool('diagnose_daten') ?? AppConfig.sendeDiagnosedaten);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: MeloTheme.schwarz,
      appBar: AppBar(
        backgroundColor: MeloTheme.dunkel1,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.white, size: 22),
          onPressed: () => Navigator.pop(context),
        ),
        title: const Row(
          children: [
            Icon(Icons.settings, color: MeloTheme.rot, size: 20),
            SizedBox(width: 10),
            Text(
              'Einstellungen',
              style: TextStyle(color: Colors.white, fontSize: 18, fontWeight: FontWeight.w600),
            ),
          ],
        ),
      ),
      body: ListView(
        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
        children: [
          // ─── Sektion: Verbindung ───
          _sektionHeader('Verbindung'),
          _einstellungsKachel(
            icon: Icons.cloud_outlined,
            titel: 'Cloud Sync',
            untertitel: 'Auto-Sync, Upload & Download',
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (_) => CloudScreen(cloud: CloudService()),
                ),
              );
            },
          ),
          _einstellungsKachel(
            icon: Icons.dns_outlined,
            titel: 'Server verbinden',
            untertitel: 'Navidrome Musik-Server',
            onTap: () {
              // Signal zum Öffnen des Server-Browsers
              Navigator.pop(context, 'server');
            },
          ),
          const SizedBox(height: 8),

          // ─── Sektion: Daten ───
          _sektionHeader('Daten & Privatsphäre'),
          Container(
            decoration: BoxDecoration(
              color: MeloTheme.dunkel1,
              borderRadius: BorderRadius.circular(14),
              border: Border.all(color: MeloTheme.dunkel2),
            ),
            child: SwitchListTile(
              title: const Text(
                'Diagnosedaten senden',
                style: TextStyle(color: Colors.white, fontSize: 14),
              ),
              subtitle: const Text(
                'Absturz-Logs & anonyme Nutzungsdaten',
                style: TextStyle(color: MeloTheme.textSekundaer, fontSize: 12),
              ),
              value: _diagnose,
              activeThumbColor: MeloTheme.rot,
              onChanged: (v) async {
                setState(() => _diagnose = v);
                AppConfig.sendeDiagnosedaten = v;
                final p = await SharedPreferences.getInstance();
                p.setBool('diagnose_daten', v);
              },
              secondary: const Icon(Icons.bug_report_outlined, color: MeloTheme.rot, size: 22),
            ),
          ),
          const SizedBox(height: 8),

          // ─── Sektion: Info ───
          _sektionHeader('Info'),
          Container(
            decoration: BoxDecoration(
              color: MeloTheme.dunkel1,
              borderRadius: BorderRadius.circular(14),
              border: Border.all(color: MeloTheme.dunkel2),
            ),
            child: Column(
              children: [
                _infoZeile('Version', '2.31'),
                const Divider(color: MeloTheme.dunkel2, height: 1),
                _infoZeile('Theme', 'Schwarz + Rot'),
                const Divider(color: MeloTheme.dunkel2, height: 1),
                _infoZeile('Auth', AppConfig.authUrl),
                const Divider(color: MeloTheme.dunkel2, height: 1),
                _infoZeile('Cloud', AppConfig.cloudUrl),
              ],
            ),
          ),
          const SizedBox(height: 24),

          // ─── Abmelden ───
          SizedBox(
            width: double.infinity,
            height: 48,
            child: OutlinedButton.icon(
              onPressed: () {
                Navigator.pop(context, 'logout');
              },
              icon: const Icon(Icons.logout, size: 18),
              label: const Text('Abmelden', style: TextStyle(fontSize: 14)),
              style: OutlinedButton.styleFrom(
                foregroundColor: MeloTheme.rot,
                side: const BorderSide(color: MeloTheme.rot),
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
              ),
            ),
          ),
          const SizedBox(height: 32),
        ],
      ),
    );
  }

  Widget _sektionHeader(String titel) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(4, 16, 4, 8),
      child: Text(
        titel,
        style: const TextStyle(
          color: MeloTheme.textSekundaer,
          fontSize: 11,
          fontWeight: FontWeight.w600,
          letterSpacing: 1.2,
        ),
      ),
    );
  }

  Widget _einstellungsKachel({
    required IconData icon,
    required String titel,
    required String untertitel,
    required VoidCallback onTap,
  }) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 8),
      child: Material(
        color: MeloTheme.dunkel1,
        borderRadius: BorderRadius.circular(14),
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(14),
          child: Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(14),
              border: Border.all(color: MeloTheme.dunkel2),
            ),
            child: Row(
              children: [
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    color: MeloTheme.dunkel2,
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: Icon(icon, color: MeloTheme.rot, size: 20),
                ),
                const SizedBox(width: 14),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        titel,
                        style: const TextStyle(color: Colors.white, fontSize: 14, fontWeight: FontWeight.w500),
                      ),
                      const SizedBox(height: 2),
                      Text(
                        untertitel,
                        style: const TextStyle(color: MeloTheme.textSekundaer, fontSize: 12),
                      ),
                    ],
                  ),
                ),
                const Icon(Icons.chevron_right, color: MeloTheme.textSekundaer, size: 20),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _infoZeile(String label, String wert) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      child: Row(
        children: [
          Text(
            label,
            style: const TextStyle(color: MeloTheme.textSekundaer, fontSize: 13),
          ),
          const Spacer(),
          Text(
            wert,
            style: const TextStyle(color: Colors.white70, fontSize: 13),
          ),
        ],
      ),
    );
  }
}