package practise;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class WebsiteLogin {

    private static final String POST_CONTENT_TYPE = "text/html; charset=UTF-8";
    private static final String LOGIN_USER_NAME_PARAMETER_NAME = "login";
    private static final String LOGIN_PASSWORD_PARAMETER_NAME = "password";
    private static final String LOGIN_USER_NAME = "myusername";
    private static final String LOGIN_PASSWORD = "mypassword";
    private static final String TARGET_URL = "https://mrpropop.com/login";

    public static void main(String[] args) {
        WebsiteLogin httpUrlBasicAuthentication = new WebsiteLogin();
        httpUrlBasicAuthentication.httpPostLogin();
    }

    public void httpPostLogin() {

        try {
            String urlEncodedContent = preparePostContent(LOGIN_USER_NAME, LOGIN_PASSWORD);
            System.out.println(urlEncodedContent);
            HttpURLConnection urlConnection = doHttpPost(TARGET_URL, urlEncodedContent);
            String response = readResponse(urlConnection);
            System.out.println("Successfully made the HTPP POST.");
            System.out.println("Recevied response is: '/n" + response + "'");

        } catch (IOException ioException) {
            System.out.println("Problems encounterd.");
        }
    }

    private String preparePostContent(String loginUserName, String loginPassword) throws UnsupportedEncodingException {

        String encodedLoginUserName = URLEncoder.encode(loginUserName, "UTF-8");
        String encodedLoginPassword = URLEncoder.encode(loginPassword, "UTF-8");
        String content = LOGIN_USER_NAME_PARAMETER_NAME + "=" + encodedLoginUserName + "&"
                + LOGIN_PASSWORD_PARAMETER_NAME + "=" + encodedLoginPassword;
        return content;
    }

    public HttpURLConnection doHttpPost(String targetUrl, String content) throws IOException {
        HttpURLConnection urlConnection = null;
        DataOutputStream dataOutputStream = null;

        try {
            urlConnection = (HttpURLConnection) (new URL(targetUrl).openConnection());
            urlConnection.setDoInput(true);
            urlConnection.setDoOutput(true);
            urlConnection.setRequestProperty("Content-Type", POST_CONTENT_TYPE);
            urlConnection.setRequestProperty("User-Agent",
                    "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8");
            HttpURLConnection.setFollowRedirects(true);
            urlConnection.setRequestMethod("POST");
            dataOutputStream = new DataOutputStream(urlConnection.getOutputStream());
            dataOutputStream.writeBytes(content);
            dataOutputStream.flush();
            dataOutputStream.close();

            return urlConnection;

        } catch (IOException ioException) {
            System.out.println("I/O problems while trying to do a HTTP post.");
            ioException.printStackTrace();

            if (dataOutputStream != null) {

                try {
                    dataOutputStream.close();
                } catch (Throwable ignore) {
                }
            }

            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            throw ioException;
        }
    }

    private String readResponse(HttpURLConnection urlConnection) throws IOException {
        BufferedReader bufferedReader = null;
        try {
            bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            String responeLine;
            StringBuilder response = new StringBuilder();

            while ((responeLine = bufferedReader.readLine()) != null) {
                response.append(responeLine);
            }
            return response.toString();

        } catch (IOException ioException) {
            System.out.println("Problems while reading the response");
            ioException.printStackTrace();
            throw ioException;

        } finally {

            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Throwable ignore) {
                }
            }
        }
    }
}