class baza {
public int racun;
public int kljuc;
public String KID;

public baza () {
KID=""; racun=kljuc=0;
}
}
public class Server_BANKA {
private int serverPort = 9811; // PORT
public static String putanja="d:\\baza\\";
public static void main(String args[]) {

if (args.length!=1) {
System.out.println("? Upotreba: java Server_BANKA putanja_do_baze");
System.exit(1);
}
putanja = args[0];
// Kreira objekt server i pokrece ga
Server_BANKA server = new Server_BANKA();
server.run();
}

public Server_BANKA() {
super();
}

public void run() {

try {

// Kreira serverov socket na datom portu
ServerSocket server = new ServerSocket(serverPort);

do {
// Vrti se zauvijek i prihvaca dolazece zahtjeve (konekcije)
Socket client = server.accept();
// Kreira novu dretvu za obradu svakoga zahtjeva (konekcije)
(new ServerThread(client)).start();

} while ( true );

} catch ( IOException ex ) {

System.exit(0);

}
}
}

class ServerThread extends Thread {

Socket client;

// Store a reference to the socket to which the client is connected

public ServerThread(Socket client) {

this.client = client;

}

// Pokretanje dretve (entry point)

public void run() {

try {

// Kreira tokove za komunikaciju sa klijentom
ServiceOutputStream outStream = new ServiceOutputStream(new BufferedOutputStream(client.getOutputStream()));
ServiceInputStream inStream = new ServiceInputStream(client.getInputStream());

// Cita klijentov zahtjev iz ulaznog toka
ServiceRequest request = inStream.getRequest();

while ( processRequest(outStream,inStream.strbla) ) {
};
outStream.close();
} catch ( IOException ex ) {

System.exit(0);

}

try {

client.close();

} catch ( IOException ex ) {

System.exit(0);

}

}

/** Provjerava DIGITALNI POTPIS na NOVCANICI
Kontrolne znamenke su jednake zbroju SVIH prethodnih znamenaka ukljucujuci i kontrolne prije*/
private boolean provjera (String strNovac) {

int intChk1=0, intChk2=0, intChk3=0, Sum=0;
boolean boolUspio = true,boolUp=true;

// Kontrolne znamenke
intChk1=strNovac.charAt(7)-48;
intChk2=strNovac.charAt(14)-48;
intChk3=strNovac.charAt(18)-48;

// Petlja provjere - racuna kontrolne i usporedjuje
for ( short i=1;i<strNovac.length();i++ ) {

if ( (i==7)&&(Sum%8!=intChk1) ) boolUspio=false;
if ( (i==14)&&(Sum%8!=intChk2) ) boolUspio=false;
if ( (i==18)&&(Sum%8!=intChk3) ) boolUspio=false;
Sum+=strNovac.charAt(i)-48;

}
if ( boolUspio==true ) {
try {

// Provjera u BAZI uporabljenih
String tmpStr1 = new String();
tmpStr1 = strNovac.substring(8,14);
int trBroj=Integer.parseInt(tmpStr1);

String ime = new String();
int ukupno;
ime = Server_BANKA.putanja+"postojece.txt";
File inputFile = new File(ime);
FileInputStream fis = new FileInputStream(inputFile);
DataInputStream inSt = new DataInputStream(fis);
ukupno = inSt.readInt();
int serija[]= new int[ukupno];
for ( int i=0;i<ukupno;i++ ) {
serija[i]=inSt.readInt();
}
for ( int i=0;i<ukupno;i++ ) {
if ( serija[i]==trBroj ) {
boolUp = false;break;
}
}
inSt.close();
fis.close();
System.out.println("ukupno"+ukupno);
if ( boolUp==true ) {

FileOutputStream outFile = new FileOutputStream(inputFile);
DataOutputStream outSt = new DataOutputStream(outFile);
ukupno++;

outSt.writeInt(ukupno);

for ( int i=0;i<ukupno-1;i++ ) outSt.writeInt(serija[i]);

outSt.writeInt(ukupno);

outSt.close();
outFile.close();
System.out.println("ukupno"+ukupno);
} // boolUp==true
} catch ( IOException IOGR ) {
System.out.println(IOGR+"\n");

}
} // boolUspio==true

return(boolUspio&&boolUp);

}

// Obrada zahtjeva je SINKRONIZIRANA ZBOG PISANJA U DATOTEKE
public synchronized boolean processRequest(ServiceOutputStream outStream, String podatak) {
int kljuc=0,racun=0;
String Stanje="$";
if ( podatak.charAt(0)!='t' ) {
try {

// obrada kupca
String KID = new String();
KID= podatak.substring(0,6);

String ime = new String();
ime = Server_BANKA.putanja+"k"+KID+".txt";
File inputFile = new File(ime);
FileInputStream fis = new FileInputStream(inputFile);
DataInputStream inSt = new DataInputStream(fis);
kljuc = inSt.readInt();
racun = inSt.readInt();
inSt.close();
fis.close();
int koliko=0,intChkSum=0,kontrola=0;

Integer prt = new Integer (koliko);
Integer chk = new Integer (intChkSum);
// treba OPTIMIZACIJA TJ. TO NA POCETAK DA NE OTVARA BEZ VEZE
for ( int i=0;i<podatak.length()-2;i++ ) intChkSum+=podatak.charAt(i);
intChkSum%=100;
kontrola = chk.parseInt(podatak.substring(12,podatak.length()));

if ( kontrola==intChkSum ) {

koliko = prt.parseInt(podatak.substring(6,12));
racun-=koliko;
Stanje+=Integer.toString(racun);

System.out.println("*******************************************************************");
System.out.println("Kupac "+ime+" zahtjeva $"+koliko+", na racunu jos $"+racun);
System.out.println("*******************************************************************");
System.out.flush();

}

FileOutputStream outFile = new FileOutputStream(inputFile);
DataOutputStream outSt = new DataOutputStream(outFile);
outSt.writeInt(kljuc);
outSt.writeInt(racun);
outSt.close();
outFile.close();
/////////////////////////////////////////////////////////////////
String Novcanica = new String();
String TempNovcanica = new String();
Obradi_zahtjev para = new Obradi_zahtjev(podatak);

TempNovcanica = para.Kreiraj_Novcanicu(koliko);
Novcanica="!"+TempNovcanica;

outStream.println(Novcanica);
outStream.println(Stanje);
outStream.flush();

//////////////////////////////////////////////////////////////////

} catch ( IOException IOGR ) {
System.out.println(IOGR+"\n");

}
} else if ( podatak.charAt(0)=='t' ) {

String dignov = new String();
String imeTrg = new String();
int stari=0;

try {
// Provjera ispravnosti digitalne novcanice
boolean ok=provjera(podatak.substring(1,podatak.indexOf('|')));
System.out.print("-------------------------------------------------------------------\nProvjera:");

if ( ok==true ) {

System.out.print("OK, ");

imeTrg=Server_BANKA.putanja+"t";
dignov = podatak.substring(2,podatak.indexOf('|'));
imeTrg+= podatak.substring(podatak.indexOf('|')+1,podatak.length());
imeTrg+=".txt";

// Ucitaj podatke iz datoteke - Stari RACUN
File inputFile = new File(imeTrg);
FileInputStream fis = new FileInputStream(inputFile);
DataInputStream inSt = new DataInputStream(fis);
kljuc = inSt.readInt();
racun = inSt.readInt();
inSt.close();
fis.close();
stari=racun;

// Povecaj racun TRGOVCU
racun+=Integer.parseInt(dignov.substring(0,6));

// Upisi podatke nazad
FileOutputStream outFile = new FileOutputStream(inputFile);
DataOutputStream outSt = new DataOutputStream(outFile);
outSt.writeInt(kljuc);
outSt.writeInt(racun);
outSt.close();
outFile.close();

/// Posalji odgovor TRGOVCU
outStream.println("BOK1");

}
// Posalji odgovor TRGOVCU da nesto nije u redu
else outStream.println("BNO0");

System.out.println(" Lokacija "+imeTrg+"\nSTANJE: STARO $"+stari+" - NOVO $"+racun);
System.out.println("-------------------------------------------------------------------\n");

} catch ( IOException IOGR ) {
System.out.println(IOGR+"\n");

}
}

return false;

}

}

///////////////////////////////////////////////////////////////////////////////////
class Obradi_zahtjev {

private String strPaket;
private String strNovac;
final private String ID_BANKA="321";

public Obradi_zahtjev(String strPaket1) {
strPaket = new String (strPaket1);
strNovac = new String ();
}

/** Ovo bi trebalo genreirati serijski broj novcanice
tako da procita zadnji iz baze i uveca za jedan i jedna kontrolna
nakon toga azurira bazu, ovo pripise novcanici i gotovo */
public String GenSerBroj() {
String ime = Server_BANKA.putanja+"serbr.txt";
int serBr=0;
try {

// Ucita zadnji izdani SERIJSKI BROJ
File inputFile = new File(ime);
FileInputStream fis = new FileInputStream(inputFile);
DataInputStream inSt = new DataInputStream(fis);
serBr = inSt.readInt();
inSt.close();
fis.close();

serBr++; // povecava serijski broj Novcanice za 1 !!!

// Upise nazad
FileOutputStream outFile = new FileOutputStream(inputFile);
DataOutputStream outSt = new DataOutputStream(outFile);
outSt.writeInt(serBr);
outSt.close();
outFile.close();
} catch ( IOException IOGR ) {
System.out.println(IOGR+"\n");

}

String temp1 = new String();
String moram = Integer.toString(serBr);
if ( moram.length()<6 ) {
for ( int h=1;h<=6-moram.length();h++ ) {
temp1+="0";
}
}
temp1+=moram;
return temp1; // sada ima 6 znamenaka
}

// generira ctrl znamenka Sum%8
public String GenKontrol(int intTr) {
int intSum=0;
for ( short i=0;i<intTr-1;i++ ) {
intSum += (int)(strNovac.charAt(i));
}
intSum%=8;
return(Integer.toString(intSum));
}

// provjera ispravnosti pristiglog paketa
public boolean Provjera() {
int intChkSum = 0, intDuz=0;
String strTmp="";

if ( (intDuz=strPaket.length())!=14 ) {
return false;
}

for ( int i=0;i<intDuz-2;i++ ) {
intChkSum+=(int)strPaket.charAt(i);
}

strTmp+=(strPaket.charAt(13)+strPaket.charAt(14));
if ( intChkSum != Integer.parseInt(strTmp) ) return false;

return true; // nije pao ni na jednoj provjeri
}

// oblikovanje novcanice: Iznos(6)+Ctrl1+Ser_br+Ctrl2+ID_Banke+Ctrl3
public String Kreiraj_Novcanicu(int intKolicina) {

String temp1 = new String();
String moram = Integer.toString(intKolicina);
if ( moram.length()<6 ) {
for ( int h=1;h<=6-moram.length();h++ ) {
temp1+="0";
}
}
temp1+=moram;
strNovac=temp1;

//strNovac+= arrTmp;
strNovac+=(GenKontrol(7)+GenSerBroj());
strNovac+=(GenKontrol(14)+ID_BANKA);
strNovac+=GenKontrol(18);
strNovac+="\r\n";
return strNovac;
}

}

// Input stream filter

class ServiceInputStream extends FilterInputStream {
public String strbla;
public ServiceInputStream(InputStream in) {
super(in);
}

public String readLine() throws IOException {

StringBuffer result=new StringBuffer();
boolean finished = false;
boolean cr = false;

do {
int ch = -1;
ch = read();
if ( ch==-1 ) return result.toString();
result.append((char) ch);

if ( cr && ch==10 ) {
result.setLength(result.length()-2);
return result.toString();
}

if ( ch==13 ) cr = true;
else cr=false;

} while ( !finished );

return result.toString();

}

// Metoda za citanje Klijentovog zahtjeva sa ulaznog toka
public ServiceRequest getRequest() throws IOException {
ServiceRequest request = new ServiceRequest();
strbla=readLine();
return request;

}

}

// naslijedjeno iz FilterOutputStreama - klasa sluzi za ispis u izlazni tok
class ServiceOutputStream extends FilterOutputStream {

public ServiceOutputStream(OutputStream out) {
super(out);
}

public void println() throws IOException {
write(13);
write(10);

}

public void println(String s) throws IOException {
for ( int i=0;i<s.length();++i ) write(s.charAt(i));
println();

}

}

// Klasa implementacije korisnikovih zahtjeva
class ServiceRequest {
Vector lines = new Vector();
public String lnm;

public ServiceRequest() {
}

public void addLine(String line) {
lines.addElement(line);
}

public boolean WhichReq() {
lnm=(String) lines.elementAt(0);
return true;
}

}