import 'dart:convert';
import 'dart:io';
import 'package:http/http.dart' as http;
import '../config/app_config.dart';
import '../services/auth_service.dart';
import '../services/melo_logger.dart';

/// Cloud-Sync Service für Melo Registry
/// Authentifizierung via Baka-Auth JWT-Token
class CloudService {
  static String get _base => AppConfig.cloudUrl;
  String _user = '';

  /// Login mit Baka-Auth – Token wird aus AuthService bezogen
  Future<bool> login(String user) async {
    _user = user;
    try {
      final r = await http
          .get(Uri.parse('$_base/api/cloud/status'),
              headers: _authHeader)
          .timeout(const Duration(seconds: 5));
      return r.statusCode == 200;
    } catch (_) {
      return false;
    }
  }

  Map<String, String> get _authHeader {
    final token = AuthService().token;
    final headers = <String, String>{
      'X-API-Key': AppConfig.ytProxyApiKey,
    };
    if (_user.isNotEmpty) {
      headers['X-User'] = _user;
    }
    // Baka-Auth JWT Token mitsenden falls vorhanden
    if (token != null && token.isNotEmpty) {
      headers['Authorization'] = 'Bearer $token';
    }
    return headers;
  }

  Future<Map?> status() => _get('/api/cloud/status');

  Future<List<Map>> listSongs() async {
    final r = await _get('/api/cloud/list');
    return List<Map>.from(r?['songs'] ?? []);
  }

  Future<String?> upload(String filepath, String filename) async {
    try {
      final req = http.MultipartRequest('POST', Uri.parse('$_base/api/cloud/upload'));
      req.headers.addAll(_authHeader);
      req.files.add(await http.MultipartFile.fromPath('file', filepath,
          filename: filename));
      final resp = await req.send().timeout(const Duration(seconds: 120));
      final body = jsonDecode(await resp.stream.bytesToString());
      return body['song_id'] as String?;
    } catch (e) {
      MeloLogger().fehler('cloud_upload', e);
      return null;
    }
  }

  Future<bool> download(String songId, String destPath) async {
    try {
      final r = await http
          .get(Uri.parse('$_base/api/cloud/download/$songId'),
              headers: _authHeader)
          .timeout(const Duration(seconds: 120));
      if (r.statusCode == 200) {
        await File(destPath).writeAsBytes(r.bodyBytes);
        return true;
      }
      return false;
    } catch (e) {
      MeloLogger().fehler('cloud_download', e);
      return false;
    }
  }

  Future<bool> delete(String songId) async {
    try {
      final r = await http
          .post(Uri.parse('$_base/api/cloud/delete'),
              headers: {..._authHeader, 'Content-Type': 'application/json'},
              body: jsonEncode({'song_id': songId}))
          .timeout(const Duration(seconds: 10));
      return r.statusCode == 200;
    } catch (_) {
      return false;
    }
  }

  Future<Map?> _get(String path) async {
    try {
      final r = await http
          .get(Uri.parse('$_base$path'), headers: _authHeader)
          .timeout(const Duration(seconds: 10));
      if (r.statusCode == 200) return jsonDecode(r.body);
    } catch (_) {}
    return null;
  }

  Future<String?> share(List<String> songIds) async {
    try {
      final r = await http
          .post(Uri.parse('$_base/api/cloud/share'),
              headers: {..._authHeader, 'Content-Type': 'application/json'},
              body: jsonEncode({'song_ids': songIds}))
          .timeout(const Duration(seconds: 10));
      if (r.statusCode == 200) {
        final d = jsonDecode(r.body);
        return d['code'] as String?;
      }
    } catch (_) {}
    return null;
  }

  Future<Map?> importCode(String code) async {
    try {
      final r = await http
          .post(Uri.parse('$_base/api/cloud/import'),
              headers: {..._authHeader, 'Content-Type': 'application/json'},
              body: jsonEncode({'code': code}))
          .timeout(const Duration(seconds: 10));
      if (r.statusCode == 200) return jsonDecode(r.body);
    } catch (_) {}
    return null;
  }

  Future<List<Map>> syncChanges(String since) async {
    try {
      final r = await http
          .post(Uri.parse('$_base/api/cloud/sync'),
              headers: {..._authHeader, 'Content-Type': 'application/json'},
              body: jsonEncode({'since': since}))
          .timeout(const Duration(seconds: 10));
      if (r.statusCode == 200) {
        final d = jsonDecode(r.body);
        return List<Map>.from(d['changes'] ?? []);
      }
    } catch (_) {}
    return [];
  }

  Future<List<Map>> globalList() async {
    try {
      final r = await http
          .get(Uri.parse('$_base/api/cloud/global'), headers: _authHeader)
          .timeout(const Duration(seconds: 10));
      if (r.statusCode == 200) {
        return List<Map>.from(jsonDecode(r.body)['songs'] ?? []);
      }
    } catch (_) {}
    return [];
  }

  Future<bool> toggleGlobal(String songId) async {
    try {
      final r = await http
          .post(Uri.parse('$_base/api/cloud/toggle-global'),
              headers: {..._authHeader, 'Content-Type': 'application/json'},
              body: jsonEncode({'song_id': songId}))
          .timeout(const Duration(seconds: 10));
      return r.statusCode == 200;
    } catch (_) {
      return false;
    }
  }
}