import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:http/http.dart' as http;
import 'package:prosapp_web_app/services/local_storage.dart';

class ApiService {
  ApiService._();
  static final instance = ApiService._();

  static String get baseUrl => dotenv.env['API_BASE_URL'] ?? 'https://backend.prosapp.co/api/v1';

  Future<String?> getToken() => Future.value(LocalStorage.prefs.getString('jwt_token'));

  Future<void> saveToken(String token) => LocalStorage.prefs.setString('jwt_token', token);

  Future<void> deleteToken() => LocalStorage.prefs.remove('jwt_token');

  Future<Map<String, String>> _headers() async {
    final token = await getToken();
    return {
      'Content-Type': 'application/json',
      if (token != null) 'Authorization': 'Bearer $token',
    };
  }

  dynamic _parse(http.Response res) {
    final body = jsonDecode(res.body);
    if (res.statusCode >= 200 && res.statusCode < 300) return body;
    throw Exception(body['message'] ?? 'Error ${res.statusCode}');
  }

  Future<dynamic> get(String path) async {
    final res = await http.get(Uri.parse('$baseUrl$path'), headers: await _headers());
    return _parse(res);
  }

  Future<dynamic> post(String path, Map<String, dynamic> body) async {
    final res = await http.post(
      Uri.parse('$baseUrl$path'),
      headers: await _headers(),
      body: jsonEncode(body),
    );
    return _parse(res);
  }

  Future<dynamic> patch(String path, Map<String, dynamic> body) async {
    final res = await http.patch(
      Uri.parse('$baseUrl$path'),
      headers: await _headers(),
      body: jsonEncode(body),
    );
    return _parse(res);
  }

  Future<dynamic> delete(String path) async {
    final res = await http.delete(Uri.parse('$baseUrl$path'), headers: await _headers());
    return _parse(res);
  }

  Future<String?> upload(Uint8List bytes, String filename) async {
    final token = await getToken();
    final req = http.MultipartRequest('POST', Uri.parse('$baseUrl/storage/upload'));
    if (token != null) req.headers['Authorization'] = 'Bearer $token';
    req.files.add(http.MultipartFile.fromBytes('file', bytes, filename: filename));
    final streamed = await req.send();
    final res = await http.Response.fromStream(streamed);
    if (res.statusCode >= 200 && res.statusCode < 300) {
      return (jsonDecode(res.body) as Map<String, dynamic>)['url'] as String?;
    }
    return null;
  }
}