/*

  This is a client using System V IPC

*/

#include <iostream.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>

// All globals that every thread should be able to see

struct msgbufl
{
	int mtype;
	char mtext[200];
};

pthread_mutex_t Screen_Lock;
int mymsg;

void *CommandSender(void *arg);

#define COMMAND		1
#define RESPONSE	2
#define COMMAND_LEN	200

int main(int argc, char ** argv)
{
  pthread_t	 commsender;
  char	*buf;
  int myuid;

  myuid = getuid();

  //Initialize the mutex that protects the output
  
  pthread_mutex_init(&Screen_Lock, NULL);

  pthread_mutex_lock(&Screen_Lock);
  cout<<"Welcome to the auction client!"<<endl;
  pthread_mutex_unlock(&Screen_Lock);
 
  mymsg = msgget(myuid, IPC_EXCL|0400|0200);
  if ( mymsg < 0) {
	perror("msgget error!");
	exit(1);
  }
  char Next_Input[COMMAND_LEN] ;
  
  //Keep going until they type quit
  while( strcmp(Next_Input, "quit")!=0 )
  {
      pthread_mutex_lock(&Screen_Lock);
      printf(">");
      pthread_mutex_unlock(&Screen_Lock);
      cin.getline(Next_Input,COMMAND_LEN-1,'\n');
      if(strlen(Next_Input)>0) {
	buf =(char *)malloc(strlen(Next_Input)+1);
 	strcpy(buf, Next_Input);
      	pthread_create(&commsender,NULL,CommandSender,(void *)buf);
      	pthread_detach(commsender);
      }
  }

  exit(0);
}


void *CommandSender(void *arg)
{
  char *buf=(char *)arg;
  struct msgbufl *msg_tosend;
  int msgsize, ret;
 
  //Create a buffer to store the response from dbserver
  char command_message[50];
  char response_message[50];

  msg_tosend =(struct msgbufl *)malloc(sizeof(struct msgbufl));
  msgsize = strlen(buf);
  strncpy(msg_tosend->mtext, buf, msgsize);
  msg_tosend->mtype = COMMAND;

    // sending command to db server
  ret = msgsnd(mymsg,msg_tosend,msgsize,MSG_NOERROR);
  if(ret<0) {
	perror("client msgsnd error!");
 	free(buf);
	free(msg_tosend);
	return NULL;
  } 

 // receiving and printing the response from db server
  
  free ( buf);
  free ( msg_tosend );
  return NULL;
  
}