package com.nus.app1;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.json.JSONException;
import org.json.JSONObject;

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;

public class LoginActivity extends Activity
{
    Button btnlogin;
    EditText tusername,tpassword;
    public static final int CONNECTION_TIMEOUT = 10000;
    public static final int READ_TIMEOUT = 150000;

    SharedPreferences sharedpreferences;
    public static final String serverpref = "serverpref";
    public static final String serveraddress = "serveraddress";
    private String saddress;
    private String url_login;
    public void onCreate(Bundle b)
    {
        super.onCreate(b);
        setContentView(R.layout.loginlayout);
        btnlogin=findViewById(R.id.btnlogin);
        tusername=findViewById(R.id.tusername);
        tpassword=findViewById(R.id.tpassword);
        sharedpreferences = getSharedPreferences(serverpref, Context.MODE_PRIVATE);
        btnlogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(tusername.getText().length()==0 || tpassword.getText().length()==0)
                {
                    Toast.makeText(getApplicationContext(),"Username or Password is empty",Toast.LENGTH_LONG).show();
                }
                else
                {
                    if (!sharedpreferences.contains(serveraddress) || sharedpreferences.getString(serveraddress,null)== null || sharedpreferences.getString(serveraddress,null)=="" )
                    {
                        Toast.makeText(getApplicationContext(),"Please set your server address here",Toast.LENGTH_LONG).show();
                        Intent serveraddressintent=new Intent(getApplicationContext(),ServerAddressActivity.class);
                        startActivity(serveraddressintent);
                    }
                    else
                    {
                        saddress=sharedpreferences.getString(serveraddress, "");
                        url_login="http://"+saddress+"/servercode/loginprocess.php";
                        new AsyncLogin().execute(tusername.getText().toString(), tpassword.getText().toString());
                    }

                }
            }
        });
    }
    public boolean onCreateOptionsMenu(Menu menu)
    {
        super.onCreateOptionsMenu(menu);
        MenuInflater menuInflater=getMenuInflater();
        menuInflater.inflate(R.menu.mymenu,menu);
        return true;
    }
    public boolean onOptionsItemSelected(MenuItem menuItem)
    {
        switch (menuItem.getItemId())
        {
            case R.id.serveraddress:
                Intent intent=new Intent(getApplicationContext(),ServerAddressActivity.class);
                startActivity(intent);
                return true;
            default:
                return super.onContextItemSelected(menuItem);
        }
    }
    private class AsyncLogin extends AsyncTask<String, String, String>
    {
        ProgressDialog pdLoading = new ProgressDialog(LoginActivity.this);
        HttpURLConnection conn;
        URL url = null;

        @Override
        protected void onPreExecute()
        {
            super.onPreExecute();
            pdLoading.setMessage("\tLoading...");
            pdLoading.setCancelable(false);
            pdLoading.show();
        }
        @Override
        protected String doInBackground(String... params)
        {
            try
            {
                url = new URL(url_login);
            }
            catch (MalformedURLException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return "exception";
            }
            try
            {
                conn = (HttpURLConnection)url.openConnection();
                conn.setReadTimeout(READ_TIMEOUT);
                conn.setConnectTimeout(CONNECTION_TIMEOUT);
                conn.setRequestMethod("POST");
                conn.setDoInput(true);
                conn.setDoOutput(true);
                Uri.Builder builder = new Uri.Builder()
                        .appendQueryParameter("username", params[0])
                        .appendQueryParameter("password", params[1]);
                String query = builder.build().getEncodedQuery();
                OutputStream os = conn.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));
                writer.write(query);
                writer.flush();
                writer.close();
                os.close();
                conn.connect();
            }
            catch (IOException e1)
            {
                e1.printStackTrace();
                return "exception";
            }
            try
            {
                int response_code = conn.getResponseCode();
                if (response_code == HttpURLConnection.HTTP_OK)
                {
                    InputStream input = conn.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                    StringBuilder result = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null)
                    {
                        result.append(line);
                    }

                    return(result.toString());
                }
                else
                {
                    return("unsuccessful");
                }

            } catch (IOException e)
            {
                e.printStackTrace();
                return "exception";
            }
            finally {
                conn.disconnect();
            }
        }
        @Override
        protected void onPostExecute(String result)
        {
            pdLoading.cancel();
            try
            {
                JSONObject json=new JSONObject(result);
                if(json.getString("status").equals("true"))
                {
                    String fullname = json.getString("fullname");
                    //editor.putString("fullname", json.getString("fullname"));
                    Toast.makeText(LoginActivity.this, "Login Success...", Toast.LENGTH_LONG).show();
                    Intent intent = new Intent(LoginActivity.this,MenuActivity.class);
                    startActivity(intent);
                    LoginActivity.this.finish();
                }
                else if(json.getString("status").equals("false"))
                {
                    Toast.makeText(LoginActivity.this, "Invalid username or password", Toast.LENGTH_LONG).show();
                }
                else
                {
                    Toast.makeText(LoginActivity.this, "Please check server connection", Toast.LENGTH_LONG).show();
                }
            }
            catch (JSONException e)
            {
                e.printStackTrace();
            }
        }
    }
}