import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
 
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
 
public class HttpClient {
 
    public String getData(String urlStr) {
        String text = null;
        try {
            text = tryGetData(urlStr);
        } catch (IOException e) {
            System.err.println("Hiba! A lekérés sikertelen!");
            System.err.println(e.getMessage());
        }
        return text;
    }
    public String tryGetData(String urlStr) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection http = (HttpURLConnection) url.openConnection();
        http.setRequestMethod("GET");
        http.connect();
 
        String text = null;
        int responseCode = http.getResponseCode();
        if (responseCode != 200) {
            throw new RuntimeException("Http válasz: " + responseCode);
        }else {
            text = new String(
                http.getInputStream().readAllBytes(), 
                StandardCharsets.UTF_8);
        }
        return text;
    }
    public ArrayList<Employee> getEmployees() {
        String urlStr = "http://[::1]:8000/employees";
        String text = this.getData(urlStr);
        GsonBuilder builder = new GsonBuilder();
        builder.setPrettyPrinting();
        Gson gson = builder.create();
 
        Employee[] employeeArray = gson.fromJson(text, Employee[].class);
        ArrayList<Employee> list = new ArrayList<>(Arrays.asList(employeeArray));
        return list;
    }
}