// main class which draws the app + ties the actions on the front end XML files such as onClick for buttons //and calls the associated method, in this case onLogin which then creates a background worker object thingy.

package hfents.hopefullyworks;

import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText UserNameEt, PasswordEt;

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        StrictMode.setThreadPolicy(policy);


        setContentView(R.layout.activity_main);
        //connecting to xml buttons.
        UserNameEt = (EditText) findViewById(R.id.etLogin);
        PasswordEt = (EditText) findViewById(R.id.etPassword);
    }

    public void OnLogin(View view){
        String userName = UserNameEt.getText().toString();
        String password = PasswordEt.getText().toString();
        String type = "login";

        BackgroundWorker backgroundWorker = new BackgroundWorker(this);
        backgroundWorker.doInBackground(type, userName, password);


    }
}


// background worker class which is responsible for starting all the Http streams and stuff like that, passing the arguments through e.g. arg[0] is login, which the logic then calls a php script I've named login.php or something. then passes everything else accordingly.

package hfents.hopefullyworks;

import android.app.AlertDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

/**
 * Created by jonathanbain on 01/09/2017.
 */

public class BackgroundWorker extends AsyncTask<String,Void,String>{

    Context context;
    AlertDialog alertDialog;
    BackgroundWorker(Context ctx){
        context = ctx;
    }

    @Override
    protected String doInBackground(String... params) {
        String type = params[0]; //first arg (login)
        String user_name = params[1];
        String user_password = params[2];
        String login_url = "http://root@138.68.168.141/login.php";
        if(type.equals("login")){
            //code for logging in

            try {
                URL url = new URL(login_url);

                    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();



                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
                String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8")+"&"
                    +URLEncoder.encode("user_password","UTF-8")+"="+URLEncoder.encode(user_password,"UTF-8");
                 //   Log.d("U", user_name);
                 //   Log.d("P", user_password);
                bufferedWriter.write(post_data);

                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();

                InputStream inputStream = httpURLConnection.getInputStream();

                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
                String result="";
                String line;
                while((line = bufferedReader.readLine())!=null){
                    result+=line;
                }

                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                Log.d("Username=", user_name);
                Log.d("Password=", user_password);
                Log.d("RESULT", result);
                return result;
            } catch (MalformedURLException e){
                        Log.d( "Malformed URL EXCEPTION",": Background Worker Login");

            }
            catch (IOException e) {

                Log.d("IO Exception:", Log.getStackTraceString(e));
            }

        }
        return "";
    }

    @Override
    protected void onPreExecute(){
        alertDialog = new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Login Status");

    }
    @Override
    protected void onPostExecute(String result){
        alertDialog.setMessage(result);
        alertDialog.show();
    }


}


// this is the login php file (ignore the config and connection ones as they work i think...

<?php
require "conn.php";
$user_name = $_POST["user_name"];
$user_pass = $_POST["user_password"];
echo $_POST["user_name"];
echo $_POST["user_password"];
echo $user_name;
echo $user_pass;

$mysql_qry = "SELECT * FROM users WHERE email LIKE '$user_name' AND password LIKE '$user_pass';";
$result = mysqli_query($conn ,$mysql_qry);
if(mysqli_num_rows($result)>0){
echo "login success, welcome user" ;
}
else{
echo "loooooogin not success";
}
?>