#include <stdio.h>
  #include <stdbool.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <string.h>

  #include <sys/ipc.h>
  #include <sys/sem.h>

  #include "printx.h"
  #include "ui.h"
  #include "nfc.h"

  #include "hvc.h"

  #define	CMD_MAX		70
  #define KEY			1100
  #define	SEM_NUMBER	2
  #define	SEM_INPUT	0
  #define	SEM_OUTPUT	1

  
  int		bus;
  bool	busFree = true;
  bool	busStop = false;

  int		mySem;
  
  int get_sem(int i)
  {
  	ushort semarr[30];
  	union semun
  	{
  		int val;
  		struct semid_ds *buf;
  		ushort *array;
  	}arg;
  
  	arg.array = semarr;
  	semctl(mySem, i, GETALL, arg);
  	return semarr[i];
  }
  
  void show_sem(int i)
  {
  	int val;
  	val = get_sem(i);
  	printf("semaphore[%d]=%d\n", i, val);
  }
  
  void create_sem(int N)
  {
  	printx(DEBUG, BUS, "create %d semaphores\n", N);
  	mySem = semget(KEY, N, 0666 | IPC_CREAT);
  	if(mySem < 0)
  		printx(ERROR, BUS, "Unable to create the semaphore\n");
  }
  
  void init_sem(int N)
  {
  	int j;
  	int retval;
  	union semun
  	{
  		int val;
  		struct semid_ds *buf;
  		ushort *array;
  	}arg;
  	arg.val = 1;
  	for (j=0; j<N; j++)
  	{
  		retval = semctl(mySem, j, SETVAL, arg);
  		if(retval < 0)
  			printx(ERROR, BUS, "Unable to initialize the semaphore\n");
  	}
  }
  
  void PV(int i, int act)
  {
  	struct sembuf op;
  	int retval;
  
  	op.sem_num = i;
  	op.sem_op = act; //1=V, -1=P
  	op.sem_flg = 0; //will wait
  	retval = semop(mySem, &op, 1);
  	if(retval != 0)
  		printx(ERROR, BUS, "Error semop will do %d\n", act);
  }
  
  void P(int i)
  {
  	PV(i, -1);
  }
  
  void V(int i)
  {
  	PV(i, 1);
  } 

  
  void stopBus()
  {
  	busStop = true;
  }
  
  void processCmd(char* buffer)
  {
  	buffer[strlen(buffer)-1]='\0';
  	if(strcmp(buffer, "quit") == 0 || strcmp(buffer, "exit") == 0)
  	{
  		printx(INFO, BUS, "Exit request receved, processing ...\n");
  		stopNFC();

  		stopHVC();

  		stopBus();
  		stopUI();
  	}

  	else if(strcmp(buffer, "setpumpon") == 0)
  	{

  		printx(INFO, BUS, "Setting PUMP ON");

  		setPumpWantedState(true);
  	}
  	else if(strcmp(buffer, "setpumpoff") == 0)
  	{

  		printx(INFO, BUS, "Setting PUMP OFF");

  		setPumpWantedState(false);
  	}
  	else if(strcmp(buffer, "setheaton") == 0)
  	{

  		printx(INFO, BUS, "Setting HEAT ON");

  		setHeatWantedState(true);
  	}
  	else if(strcmp(buffer, "setheatoff") == 0)
  	{

  		printx(INFO, BUS, "Setting HEAT OFF");

  		setHeatWantedState(false);
  	}

  	else if(strcmp(buffer, "setheaton5s") == 0)
  	{

  		printx(INFO, BUS, "Setting HEAT ON for 5 secs");

  		setHeatTimer(5);
  		setHeatWantedState(true);
  	}

  	else if(strcmp(buffer, "setheaton10s") == 0)

  	{
  		printx(INFO, BUS, "Setting HEAT ON for 10 secs");
  		setHeatTimer(10);
  		setHeatWantedState(true);
  	}

  	else if(strcmp(buffer, "setpumpon5s") == 0)
  	{

  		printx(INFO, BUS, "Setting PUMP ON for 5 secs");

  		setPumpTimer(5);
  		setPumpWantedState(true);
  	}

  
  	//printx(DEBUG, BUS, "STRLEN : %d and strcmp ret %d", strlen(buffer), strcmp(buffer, "quit"));

  }
  
  void* processBus(void* we)
  {
  	bus = open("bus.log", O_RDWR);
  	char	buffer[CMD_MAX];
  	printx(DEBUG, BUS, "Waiting for events\n");
  	while(!busStop)
  	{

  		P(SEM_OUTPUT);
  		//while(busFree);
  		//while(!busFree);

  		printx(DEBUG, BUS, "Event receved !\n");
  		busFree = false;
  		lseek(bus, 0, SEEK_SET);

  		printx(DEBUG, BUS, "Data read %d\n", read(bus, buffer, CMD_MAX));

  		ftruncate(bus, 0);
  		sync();
  		processCmd(buffer);
  		busFree = true;
  		printx(DEBUG, BUS, buffer);

  		V(SEM_INPUT);

  	}
  	return NULL;
  }
  
  bool initBus()
  {

  	create_sem(SEM_NUMBER);
  	printx(ERROR, BUS, "Oh dear, something went wrong with %s !\n", strerror(errno));
  	init_sem(SEM_INPUT);
  	init_sem(SEM_OUTPUT);

  	bus = creat("bus.log", 0666);
  	if(bus == -1)
  	{
  		printf("Unable to open the bus file\n");
  		return false;
  	}
  

  	//P(SEM_INPUT);
  

  	return true;
  }
  
  void sendToBus(char* cmd)
  {

  	printx(DEBUG, BUS, "Control semaphore %d in %d out %d\n", mySem, get_sem(SEM_INPUT), get_sem(SEM_OUTPUT));
  	P(SEM_INPUT);

  	ftruncate(bus, 0);
  	ftruncate(bus, CMD_MAX);
  	lseek(bus, 0, SEEK_SET);
  	dprintf(bus, "%s\n", cmd);

  	V(SEM_OUTPUT);

  }