#include <LiquidCrystal_I2C.h> 


#define WINDOW 0
#define WATER  1
#define TEMPERATURE 2
#define FIRE 3


//OUTDOOR SENSOR CONNECTIONS
#define FRONTDOOR 4
#define PRESENCE 5
#define GARAGE 6
#define BACKDOOR 7

#define KEY 10
#define RFID 9


bool isIndoorSensor();
bool isOutdoorSensor();
void show(char *);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// variable state contains the current state
enum {STANDBY,INDOORS,OUTDOORS,ALARM} state = STANDBY;



void setup()
{
  
  pinMode(FIRE,INPUT_PULLUP);
  pinMode(BACKDOOR,INPUT_PULLUP);
  pinMode(WATER,INPUT_PULLUP);
  pinMode(WINDOW,INPUT_PULLUP);
  pinMode(TEMPERATURE,INPUT_PULLUP);    
  pinMode(GARAGE,INPUT_PULLUP);
  pinMode(PRESENCE,INPUT_PULLUP);
  pinMode(FRONTDOOR,INPUT_PULLUP);
  pinMode(KEY,INPUT);
  pinMode(RFID,INPUT);
  lcd.backlight();
  lcd.begin(16, 2);    
  show("STANDBY");
    
}

void loop()
{
  // turn the LED on (HIGH is the voltage level)
  switch (state) {
    case STANDBY:
    if(isActivated()) 
    {
      state= INDOORS;
      show ("INDOORS");
    }
    //Implement
		break;

    case INDOORS:
    if(isRFID())
    {
      state= OUTDOORS;
      show("OUTDOORS");
    }
    //Implement
    else if (isIndoorSensor())
    {
      state = ALARM;
      show("ALARM");
    }
    else if (isActivated())
    {
      state = STANDBY;
      show("STANDBY");
    }
   	break;
    
    case OUTDOORS:
    if (isRFID())
    {
      state = INDOORS;
      show("INDOORS");
    }
    else if (isIndoorSensor() || (isOutdoorSensor()))  {
      state = ALARM;
      show("ALARM");
    }
    
    //Implement
    
    case ALARM:
    if (isActivated())
    {
      state= STANDBY;
      show("STANDBY");
    }
   	break;
    
  }
  
   
}

bool isIndoorSensor() {
  //Implement
  return !(digitalRead(WINDOW) && digitalRead(WATER) 
            && digitalRead(TEMPERATURE) && digitalRead(FIRE));
}
            
bool isOutdoorSensor() {
  //Implement
  return !(digitalRead(FRONTDOOR) && digitalRead(BACKDOOR) 
            && digitalRead(PRESENCE) && digitalRead(GARAGE));
}            

void show(char* msg) {
	lcd.setCursor(0,0);
	lcd.print(msg);
    lcd.print("  ");
     
}
bool isActivated() {return digitalRead(KEY);}
bool isRFID() {return digitalRead(RFID);}