// LCD2004 Tiny Pacman on Wokwi

#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
//LiquidCrystal(rs, enable, d4, d5, d6, d7) ;
#define LED_GREEN 0
#define LED_RED 1

// set pin numbers:
int latchPin = 13; // Pin connected to ST_CP of 74HC595（Pin13）
int clockPin = 12; // Pin connected to SH_CP of 74HC595（Pin12）
int dataPin = 11; //  Pin connected to DS of 74HC595（Pin11）

int P1 = 8 ;
int P2 = 9 ;
int P3 = 10 ;

bool toogleP1 = false;
bool toogleP2 = false;
bool toogleP3 = false;

byte LEDs = 0b01010101; 

int counter = 4;

int spaceOne = 1;
int spaceTwo = 2;
int spaceThree = 3;
int spaceFour = 4;

int sensor1Pin = A0; // IR Sensor 1 Pin
int sensor2Pin = A1; // IR Sensor 2 Pin
int sensor3Pin = A2; // IR Sensor 3 Pin
int sensor4Pin = A3; // IR Sensor 4 Pin


void setup() {
  lcd.begin(20, 4);
  //lcd.begin(cols, rows): 

  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);

  pinMode(P1, INPUT);
  pinMode(P2, INPUT);
  pinMode(P3, INPUT);

  lcd.print("   AVAILABLE");// Print a message to the LCD
  lcd.setCursor(3,1);
  lcd.print("0");
  lcd.print (counter);
  lcd.print(" SPACES");
  updateShiftRegister();
}

void loop() {

  if (digitalRead(P1) == LOW)
  
{
LEDs = 0b00000000; 
updateShiftRegister();
lcd.clear();
lcd.setCursor(3,0);
lcd.print ("System Off");
}
else 
{
if (digitalRead(P2) == LOW)
{
    if( analogRead(sensor1Pin)>500) 
    {
      updateLEDsParking(spaceOne, LED_RED);
      counter--;
      delay(100);
    }
    else 
    {
      updateLEDsParking(spaceOne, LED_GREEN);
      counter++;
      delay(100);
    }

    lcd.setCursor(3,1);
    lcd.print("0");
    lcd.print (counter);
    lcd.print(" SPACES");
}
if (digitalRead(P2) == LOW)
{
 if( analogRead(sensor2Pin)>500) 
    {
      updateLEDsParking(spaceTwo, LED_RED);
      counter--;
      delay(100);
    }
    else 
    {
      updateLEDsParking(spaceTwo, LED_GREEN);
      counter++;
      delay(100);
    }
    lcd.setCursor(3,1);
    lcd.print("0");
    lcd.print (counter);
    lcd.print(" SPACES");
}
if (digitalRead(P2) == LOW)
{
 if( analogRead(sensor3Pin)>500)
    {
      updateLEDsParking(spaceThree, LED_RED);
      counter--;
      delay(100);
    }
    else 
    {
      updateLEDsParking(spaceThree, LED_GREEN);
      counter++;
      delay(100);
    }
    lcd.setCursor(3,1);
    lcd.print("0");
    lcd.print (counter);
    lcd.print(" SPACES");
  }
  if (digitalRead(P2) == LOW)
{
 if( analogRead(sensor4Pin)>500)
    {
      updateLEDsParking(spaceFour, LED_RED);
      counter--;
      delay(100);
    }
    else 
    {
      updateLEDsParking(spaceFour, LED_GREEN);
      counter++;
      delay(100);
    }
    lcd.setCursor(3,1);
    lcd.print("0");
    lcd.print (counter);
    lcd.print(" SPACES");
    }
}
if (digitalRead(P3) == LOW)
{
LEDs = 0b01010101; 
counter=4;
updateShiftRegister();
lcd.clear();
lcd.setCursor(3,0);
lcd.print ("Reset System");
lcd.setCursor(3,1);
lcd.print("0");
lcd.print (counter);
lcd.print(" SPACES");
}

}



void updateShiftRegister()
{
  digitalWrite(latchPin, LOW); // Output low level to latchPin
  shiftOut(dataPin, clockPin, LSBFIRST, LEDs); // Send serial data to 74HC595
  digitalWrite(latchPin, HIGH); // Output high level to latchPin, and 74HC595 will update the data to the parallel output port.
}

/*************************************************************/

void updateLEDsParking(int parkingSpace, int status)
{
  if (parkingSpace == spaceOne)
  {
    if(status) LEDs = ((LEDs&0b10111111)| 0b10000000);
    else LEDs = ((LEDs&0b01111111)|0b01000000);
  }
  if (parkingSpace == spaceTwo)
  {
    if(status) LEDs = ((LEDs&0b11101111)| 0b00100000);
    else LEDs = ((LEDs&0b11011111)|0b00010000);
  }

  if (parkingSpace == spaceThree)
  {
    if(status) LEDs = ((LEDs&0b11111011)| 0b00001000);
    else LEDs = ((LEDs&0b11110111)|0b00000100);
  }

  if (parkingSpace == spaceFour)
  {
    if(status) LEDs = ((LEDs&0b11111110)| 0b00000010);
    else LEDs = ((LEDs&0b11111101)|0b00000001);
  }
  updateShiftRegister();
  delay(200);
}