import 'dart:convert';
import 'package:http/http.dart' as http;
import '../models/models.dart';

class ApiService {
  String baseUrl;
  String? _token;

  ApiService({required this.baseUrl});

  String? get token => _token;
  bool get isAuthenticated => _token != null;

  void setToken(String token) {
    _token = token;
  }

  Map<String, String> get _headers => {
    if (_token != null) 'Authorization': 'Bearer $_token',
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  };

  Future<AuthResponse> login(String email, String password) async {
    final response = await http.post(
      Uri.parse('$baseUrl/api/v1/auth'),
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({'email': email, 'password': password}),
    );

    if (response.statusCode == 200) {
      final data = AuthResponse.fromJson(jsonDecode(response.body));
      setToken(data.token);
      return data;
    }

    final body = jsonDecode(response.body);
    throw ApiException(
      statusCode: response.statusCode,
      message: body['error'] ?? 'Unknown error',
    );
  }

  Future<AppsResponse> getApps() async {
    final response = await http.get(
      Uri.parse('$baseUrl/api/v1/apps'),
      headers: _headers,
    );

    if (response.statusCode == 200) {
      return AppsResponse.fromJson(jsonDecode(response.body));
    }

    if (response.statusCode == 401) {
      throw AuthException();
    }

    final body = jsonDecode(response.body);
    throw ApiException(
      statusCode: response.statusCode,
      message: body['error'] ?? 'Unknown error',
    );
  }

  Future<http.StreamedResponse> downloadVersion(String versionId) async {
    final request = http.Request(
      'GET',
      Uri.parse('$baseUrl/api/v1/versions/$versionId/download'),
    );
    request.headers.addAll(_headers);

    final response = await http.Client().send(request);

    if (response.statusCode == 200) {
      return response;
    }

    if (response.statusCode == 401) {
      throw AuthException();
    }

    response.stream.drain();
    final body = await response.stream.bytesToString();
    final parsed = jsonDecode(body);
    throw ApiException(
      statusCode: response.statusCode,
      message: parsed['error'] ?? 'Download failed',
    );
  }

  String iconUrl(String iconPath) {
    if (iconPath.startsWith('http')) return iconPath;
    return '$baseUrl$iconPath';
  }
}

class ApiException implements Exception {
  final int statusCode;
  final String message;

  ApiException({required this.statusCode, required this.message});

  @override
  String toString() => message;
}

class AuthException implements Exception {}