import java.security.*;
import java.math.*;
import java.awt.Color;
import javax.swing.JApplet;
import java.awt.GridLayout;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import javax.swing.JTextArea;

public class SMS extends JApplet
{
    private int pocet=0;    
    private JTextArea t=new JTextArea();
    private String text="";
    private String vysledek="";
    private String tel="",zprava="",heslo="";

/********************************************************************************************************/
    private String odesliSMS(String tel,String text)
    {
        if(text==null || tel==null)return "Chybne udaje";
        if(tel.length()==0 || text.length()==0)return "Chybne udaje";

        String cesta="http://www.sms.cz/brana/?jmeno=NAME";
        String hash="";

        //přeforámujem text
        text=text.replaceAll(" ","%20");

        // HASH
        /********************************************************************************************************/
        pripis("Pripojeni...");
        //připojíme se na sms.cz
        URL u=null,u2=null;
        HttpURLConnection uc=null;
        URLConnection uc2=null;
        InputStreamReader isr=null,isr2=null;
        BufferedReader br=null,br2=null;
        String s="",s2="",e="\n";

        try
        {
            u=new URL(cesta);
            pripis("Adresa: "+u);

            uc=(HttpURLConnection) u.openConnection();
            uc.setDoOutput(false);
            uc.setDoInput(true);
            uc.connect();

            isr=new InputStreamReader(uc.getInputStream());
            br=new BufferedReader(isr);

            s=br.readLine();            

            uc.disconnect();
                        
            
            pripis("Pripojeni se zdarilo.");

        
            hash=s;
            pripis("Hash:"+hash);


        // Autorizace
        /********************************************************************************************************/

            String autorizace="externibrana"+hash+""+heslo+"overeniMD5";
            try
            {         
                MessageDigest m=MessageDigest.getInstance("MD5");
                m.update(autorizace.getBytes(),0,autorizace.length());
                autorizace=new BigInteger(1,m.digest()).toString(16);            

            }catch(Exception ex2){pripis("Chyba pri vypoctu MD5");return "Chyba";}

            // Odeslání
            /********************************************************************************************************/
            pripis("Probiha odesilani zpravy");
            String adresa="http://www.sms.cz/brana/?jmeno=NAME&auth="+autorizace+"&mobil="+tel+"&zprava="+text;

            s="";
            try
            {
                u2=new URL(adresa);
                pripis("Adresa: "+adresa);
                uc2=u2.openConnection();
                isr2=new InputStreamReader(uc2.getInputStream());
                br2=new BufferedReader(isr2);

                pripis("Pripojeni se zdarilo.");

                //načteme obsah                
                while (true)
                {
                    s2=br2.readLine();
                    if(s2!=null)
                    {                 
                        if(s.length()!=0)s=s+e+s2;
                            else s=s2;

                    }else break;
                }                

                //

            }catch(Exception ex){pripis("Pripojeni nebylo mozno navzat.");s="Chyba";}
            
        }catch(Exception ex){pripis("Pripojeni nebylo mozno navzat.");s="Chyba";}//od hashe
        return s;
    }

/********************************************************************************************************/
    @Override
    public void init()
    {
      this.setLayout(new GridLayout(1,1));

      setBackground( Color.cyan );
      setForeground( Color.black );
      this.addNotify();      
            
      this.add("1",t);
      t.setLocation(0,0);
      t.setSize(this.getWidth(), this.getHeight());

      //načtení parametrů      
      try
      {
        tel=getParameter("tel");
        zprava=getParameter("zprava");
        heslo=getParameter("heslo");
                
      }catch(Exception ex3){tel="";zprava="";heslo="";}
      //
    }

/********************************************************************************************************/
    @Override
    public void start()
    {
        
        if(pocet==0)
        {
            
            pripis("JAVA APPLET\nOdesilani SMS pres sms.cz\n");

            pripis("Telefon: "+tel);
            pripis("Zprava: "+zprava+"\n");

            String s=odesliSMS(tel, zprava);            
            vysledek=s;
            pripis("\nVysledek:");
            pripis(s);

            destroy();
        }
        pocet++;        
    }

/********************************************************************************************************/
    public String getVysledek()
    {
        return vysledek;
    }

/********************************************************************************************************/
    @Override
    public String getAppletInfo()
    {
        return "SMS applet pro DATin.cz";
    }
    
/********************************************************************************************************/
    private void pripis(String s)
    {
        if(text.length()!=0) text+="\n"+s;
            else text=s;
        
        t.setText(text);
    }

}