import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../utils/farb_theme.dart';
import '../services/cloud_service.dart';
import '../services/auth_service.dart';
import '../services/melo_logger.dart';

class CloudScreen extends StatefulWidget {
  final CloudService cloud;
  const CloudScreen({super.key, required this.cloud});

  @override
  State<CloudScreen> createState() => _CloudScreenState();
}

class _CloudScreenState extends State<CloudScreen> {
  int _serverCount = 0;
  bool _ladt = false;
  String? _status;
  bool _statusOk = false;
  bool _autoSync = true;
  int _syncIntervall = 6;
  Timer? _syncTimer;
  String _letzterSync = 'Nie';
  List<Map> _korrupteSongs = [];
  bool _ladtKorrupt = false;
  bool _hatGeprueft = false;

  @override
  void initState() {
    super.initState();
    _status = 'Verbinde...';
    _verbindeCloud();
    _ladeStatus();
    _ladeSettings();
  }

  @override
  void dispose() {
    _syncTimer?.cancel();
    super.dispose();
  }

  Future<void> _verbindeCloud() async {
    final user = AuthService().benutzer;
    if (user.isNotEmpty) {
      final ok = await widget.cloud.login(user);
      if (!ok && mounted) {
        setState(() => _setzeStatus('Cloud-Login fehlgeschlagen', ok: false));
      }
    }
  }

  Future<void> _ladeSettings() async {
    final p = await SharedPreferences.getInstance();
    final letzter = p.getString('cloud_last_sync');
    if (mounted) {
      setState(() {
        _autoSync = p.getBool('cloud_auto') ?? true;
        _syncIntervall = p.getInt('cloud_interval') ?? 6;
        _letzterSync = letzter ?? 'Nie';
      });
    }
    _starteAutoSync();
  }

  void _starteAutoSync() {
    _syncTimer?.cancel();
    if (!_autoSync || _syncIntervall == 0) return;
    _syncTimer = Timer.periodic(
      Duration(hours: _syncIntervall),
      (_) => _autoSyncDurchfuehren(),
    );
  }

  Future<void> _autoSyncDurchfuehren() async {
    await _download();
    final p = await SharedPreferences.getInstance();
    final now = DateTime.now();
    final zeit = '${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}';
    await p.setString('cloud_last_sync', zeit);
    if (mounted) setState(() => _letzterSync = zeit);
  }

  Future<void> _ladeStatus() async {
    final st = await widget.cloud.status();
    if (!mounted) return;
    setState(() {
      _serverCount = st?['total'] ?? 0;
      _statusOk = st != null;
      _status = st != null ? 'Verbunden' : 'Keine Verbindung (Token?)';
    });
  }

  Future<void> _ladeKorrupteSongs() async {
    setState(() { _ladtKorrupt = true; _hatGeprueft = false; });
    try {
      final corrupted = await widget.cloud.getCorrupted();
      if (mounted) setState(() { _korrupteSongs = corrupted; _hatGeprueft = true; });
    } catch (e) {
      MeloLogger().fehler('cloud_corrupted_laden', e);
      if (mounted) setState(() => _hatGeprueft = true);
    } finally {
      if (mounted) setState(() => _ladtKorrupt = false);
    }
  }

  Future<void> _upload() async {
    setState(() => _ladt = true);
    _setzeStatus('Suche lokale Songs...');
    try {
    final dir = Directory('${(await getApplicationDocumentsDirectory()).path}/music');
    if (!await dir.exists()) {
      setState(() { _ladt = false; _setzeStatus('Keine lokalen Songs', ok: false); });
      return;
    }
    final files = dir.listSync().whereType<File>().where((f) =>
        f.path.endsWith('.mp3') || f.path.endsWith('.m4a'));
    int count = 0;
    for (final f in files) {
      _setzeStatus('Upload: ${f.path.split('/').last}...');
      final sid = await widget.cloud.upload(f.path, f.path.split('/').last);
      if (sid != null) count++;
    }
    await _ladeStatus();
    if (mounted) {
      setState(() { _ladt = false; });
      _setzeStatus('$count Songs hochgeladen', ok: count > 0);
      MeloLogger().aktion('cloud_upload', {'count': count});
    }
    } catch (e) {
      MeloLogger().fehler('cloud_upload_path', e);
      if (mounted) setState(() { _ladt = false; _setzeStatus('Fehler beim Upload', ok: false); });
    }
  }

  Future<void> _download() async {
    setState(() { _ladt = true; });
    _setzeStatus('Vergleiche mit Server...');
    try {
    final dir = Directory('${(await getApplicationDocumentsDirectory()).path}/music');
    if (!await dir.exists()) await dir.create(recursive: true);
    final localFiles = dir.listSync().whereType<File>()
        .map((f) => f.path.split('/').last).toSet();
    final serverSongs = await widget.cloud.listSongs();
    int downloaded = 0;
    for (final song in serverSongs) {
      final title = (song['title'] ?? 'unknown').toString();
      if (localFiles.contains(title)) continue;
      _setzeStatus('Download: $title...');
      final sid = song['id'].toString();
      final dest = '${dir.path}/$title';
      if (await widget.cloud.download(sid, dest)) downloaded++;
    }
    await _ladeStatus();
    if (mounted) {
      setState(() { _ladt = false; });
      _setzeStatus('$downloaded Songs heruntergeladen', ok: true);
      MeloLogger().aktion('cloud_download', {'count': downloaded});
    }
    } catch (e) {
      MeloLogger().fehler('cloud_download_path', e);
      if (mounted) setState(() { _ladt = false; _setzeStatus('Fehler beim Download', ok: false); });
    }
  }

  void _setzeStatus(String msg, {bool ok = false}) {
    if (mounted) setState(() { _status = msg; _statusOk = ok; });
  }

  @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: [
            Text('☁️', style: TextStyle(fontSize: 20)),
            SizedBox(width: 8),
            Text('Cloud Sync', style: TextStyle(color: Colors.white, fontSize: 18, fontWeight: FontWeight.w600)),
          ],
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh, color: Colors.grey, size: 20),
            onPressed: _ladeStatus,
          ),
        ],
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // ─── Status-Karte ───
            _statusKarte(),
            const SizedBox(height: 20),

            // ─── Upload / Download Buttons ───
            Row(
              children: [
                Expanded(child: _aktionsButton(
                  icon: Icons.upload_rounded,
                  label: 'Upload',
                  beschreibung: 'Lokale Songs → Server',
                  onTap: _upload,
                )),
                const SizedBox(width: 12),
                Expanded(child: _aktionsButton(
                  icon: Icons.download_rounded,
                  label: 'Download',
                  beschreibung: 'Server → Lokal',
                  onTap: _download,
                )),
              ],
            ),

            // Lade-Indikator
            if (_ladt)
              const Padding(
                padding: EdgeInsets.only(top: 16),
                child: Center(child: CircularProgressIndicator(color: MeloTheme.rot)),
              ),

            // Status-Text
            if (_status != null && !_ladt)
              Padding(
                padding: const EdgeInsets.only(top: 12),
                child: Container(
                  width: double.infinity,
                  padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
                  decoration: BoxDecoration(
                    color: _statusOk ? const Color(0xFF0D3B1E) : const Color(0xFF3B0D0D),
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: Row(
                    children: [
                      Icon(
                        _statusOk ? Icons.check_circle : Icons.info_outline,
                        size: 16,
                        color: _statusOk ? const Color(0xFF4CAF50) : const Color(0xFFEF5350),
                      ),
                      const SizedBox(width: 8),
                      Expanded(
                        child: Text(
                          _status!,
                          style: TextStyle(
                            color: _statusOk ? const Color(0xFFA5D6A7) : const Color(0xFFEF9A9A),
                            fontSize: 13,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ),

            const SizedBox(height: 24),

            // ─── Sync-Einstellungen ───
            _sektionsHeader('⚙ Sync-Einstellungen'),
            const SizedBox(height: 8),

            // Auto-Sync Toggle
            Container(
              decoration: BoxDecoration(
                color: MeloTheme.dunkel1,
                borderRadius: BorderRadius.circular(14),
                border: Border.all(color: MeloTheme.dunkel2),
              ),
              child: SwitchListTile(
                title: const Text('Auto-Sync', style: TextStyle(color: Colors.white, fontSize: 14)),
                subtitle: Text(
                  _autoSync ? 'Automatisch synchronisieren' : 'Nur manuell',
                  style: const TextStyle(color: MeloTheme.textSekundaer, fontSize: 12),
                ),
                value: _autoSync,
                activeColor: MeloTheme.rot,
                secondary: const Icon(Icons.sync, color: MeloTheme.rot, size: 22),
                onChanged: (v) async {
                  setState(() => _autoSync = v);
                  (await SharedPreferences.getInstance()).setBool('cloud_auto', v);
                  _starteAutoSync();
                },
              ),
            ),
            const SizedBox(height: 12),

            // Sync-Intervall – schöne Segmented Buttons
            const Text(
              'Intervall',
              style: TextStyle(color: MeloTheme.textSekundaer, fontSize: 12, fontWeight: FontWeight.w500),
            ),
            const SizedBox(height: 8),
            _intervallAuswahl(),
            const SizedBox(height: 20),

            // ─── Korrupte Songs (vom Server) ───
            _sektionsHeader('⚠️ Defekte Musik (Server)'),
            const SizedBox(height: 8),
            _korrupteSektion(),

            const SizedBox(height: 20),

            // Letzter Sync
            Container(
              width: double.infinity,
              padding: const EdgeInsets.all(14),
              decoration: BoxDecoration(
                color: MeloTheme.dunkel1,
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: MeloTheme.dunkel2),
              ),
              child: Row(
                children: [
                  const Icon(Icons.history, color: MeloTheme.textSekundaer, size: 18),
                  const SizedBox(width: 10),
                  const Text('Letzter Sync: ', style: TextStyle(color: MeloTheme.textSekundaer, fontSize: 13)),
                  Text(
                    _letzterSync,
                    style: const TextStyle(color: Colors.white, fontSize: 13, fontWeight: FontWeight.w500),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 32),
          ],
        ),
      ),
    );
  }

  Widget _statusKarte() {
    return Container(
      width: double.infinity,
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          colors: [Color(0xFF1A0000), Color(0xFF0D0D0D)],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        borderRadius: BorderRadius.circular(18),
        border: Border.all(color: MeloTheme.rot.withValues(alpha: 0.3)),
      ),
      child: Row(
        children: [
          Container(
            width: 48,
            height: 48,
            decoration: BoxDecoration(
              color: MeloTheme.rot.withValues(alpha: 0.15),
              borderRadius: BorderRadius.circular(14),
            ),
            child: const Icon(Icons.storage_rounded, color: MeloTheme.rot, size: 24),
          ),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  '$_serverCount',
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 28,
                    fontWeight: FontWeight.w700,
                  ),
                ),
                const Text(
                  'Songs auf dem Server',
                  style: TextStyle(color: MeloTheme.textSekundaer, fontSize: 13),
                ),
              ],
            ),
          ),
          // Verbindungsstatus-Indikator
          Container(
            width: 12,
            height: 12,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: _statusOk ? const Color(0xFF4CAF50) : const Color(0xFFEF5350),
              boxShadow: [
                BoxShadow(
                  color: (_statusOk ? const Color(0xFF4CAF50) : const Color(0xFFEF5350)).withValues(alpha: 0.5),
                  blurRadius: 8,
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _aktionsButton({
    required IconData icon,
    required String label,
    required String beschreibung,
    required VoidCallback onTap,
  }) {
    return Material(
      color: MeloTheme.dunkel1,
      borderRadius: BorderRadius.circular(16),
      child: InkWell(
        onTap: _ladt ? null : onTap,
        borderRadius: BorderRadius.circular(16),
        child: Container(
          padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 16),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: MeloTheme.dunkel2),
          ),
          child: Column(
            children: [
              Icon(icon, color: MeloTheme.rot, size: 28),
              const SizedBox(height: 8),
              Text(label, style: const TextStyle(color: Colors.white, fontSize: 15, fontWeight: FontWeight.w600)),
              const SizedBox(height: 4),
              Text(beschreibung,
                  textAlign: TextAlign.center,
                  style: const TextStyle(color: MeloTheme.textSekundaer, fontSize: 11)),
            ],
          ),
        ),
      ),
    );
  }

  Widget _intervallAuswahl() {
    final optionen = [
      _IntervallOption('Manuell', 0, Icons.block),
      _IntervallOption('3 Std', 3, Icons.timer),
      _IntervallOption('6 Std', 6, Icons.timer),
      _IntervallOption('12 Std', 12, Icons.timer),
    ];

    return Row(
      children: optionen.map((opt) {
        final istAktiv = _syncIntervall == opt.wert;
        return Expanded(
          child: Padding(
            padding: EdgeInsets.only(
              right: opt != optionen.last ? 8 : 0,
            ),
            child: GestureDetector(
              onTap: () async {
                setState(() => _syncIntervall = opt.wert);
                (await SharedPreferences.getInstance()).setInt('cloud_interval', opt.wert);
                _starteAutoSync();
              },
              child: AnimatedContainer(
                duration: const Duration(milliseconds: 250),
                padding: const EdgeInsets.symmetric(vertical: 14, horizontal: 6),
                decoration: BoxDecoration(
                  color: istAktiv ? MeloTheme.rot : MeloTheme.dunkel1,
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(
                    color: istAktiv ? MeloTheme.rot : MeloTheme.dunkel2,
                  ),
                ),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Icon(
                      opt.icon,
                      size: 16,
                      color: istAktiv ? Colors.white : MeloTheme.textSekundaer,
                    ),
                    const SizedBox(height: 6),
                    Text(
                      opt.label,
                      textAlign: TextAlign.center,
                      style: TextStyle(
                        fontSize: 11,
                        fontWeight: FontWeight.w600,
                        color: istAktiv ? Colors.white : MeloTheme.textSekundaer,
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        );
      }).toList(),
    );
  }

  Widget _sektionsHeader(String titel) {
    return Text(
      titel,
      style: const TextStyle(
        color: MeloTheme.textSekundaer,
        fontSize: 11,
        fontWeight: FontWeight.w600,
        letterSpacing: 1.2,
      ),
    );
  }

  Widget _korrupteSektion() {
    return Container(
      width: double.infinity,
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: MeloTheme.dunkel1,
        borderRadius: BorderRadius.circular(14),
        border: Border.all(color: MeloTheme.dunkel2),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Button zum Abrufen
          Row(
            children: [
              Expanded(
                child: GestureDetector(
                  onTap: _ladtKorrupt ? null : _ladeKorrupteSongs,
                  child: Container(
                    padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 14),
                    decoration: BoxDecoration(
                      color: MeloTheme.rot.withValues(alpha: 0.1),
                      borderRadius: BorderRadius.circular(10),
                    ),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        if (_ladtKorrupt)
                          const SizedBox(
                            width: 14, height: 14,
                            child: CircularProgressIndicator(
                              color: MeloTheme.rot, strokeWidth: 2,
                            ),
                          )
                        else
                          const Icon(Icons.warning_amber_rounded, color: MeloTheme.rot, size: 16),
                        const SizedBox(width: 8),
                        Text(
                          _ladtKorrupt ? 'Prüfe...' : 'Auf defekte Musik prüfen',
                          style: const TextStyle(
                            color: MeloTheme.rot, fontSize: 13, fontWeight: FontWeight.w600,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ),
            ],
          ),

          // Ergebnisliste
          if (_korrupteSongs.isNotEmpty) ...[
            const SizedBox(height: 12),
            const Divider(color: MeloTheme.dunkel2, height: 1),
            const SizedBox(height: 8),
            Text(
              '${_korrupteSongs.length} defekte Songs gefunden:',
              style: const TextStyle(
                color: Color(0xFFEF9A9A), fontSize: 12, fontWeight: FontWeight.w500,
              ),
            ),
            const SizedBox(height: 8),
            ..._korrupteSongs.map((s) => Padding(
              padding: const EdgeInsets.only(bottom: 6),
              child: Row(
                children: [
                  const Text('⚠️', style: TextStyle(fontSize: 13)),
                  const SizedBox(width: 8),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          s['title']?.toString() ?? 'Unbekannt',
                          style: const TextStyle(
                            color: Colors.white70, fontSize: 12,
                            decoration: TextDecoration.lineThrough,
                          ),
                        ),
                        if (s['reason'] != null)
                          Text(
                            s['reason'].toString(),
                            style: const TextStyle(
                              color: MeloTheme.textSekundaer, fontSize: 10,
                            ),
                          ),
                      ],
                    ),
                  ),
                ],
              ),
            )),
          ] else if (!_ladtKorrupt && _hatGeprueft && _korrupteSongs.isEmpty)
            const Padding(
              padding: EdgeInsets.only(top: 8),
              child: Text(
                'Keine defekten Songs auf dem Server',
                style: TextStyle(color: Color(0xFFA5D6A7), fontSize: 12),
              ),
            ),
        ],
      ),
    );
  }
}

class _IntervallOption {
  final String label;
  final int wert;
  final IconData icon;
  const _IntervallOption(this.label, this.wert, this.icon);
}