#include <LiquidCrystal.h>


#define buttonP 2
#define crossP 9
#define redP 12
#define yellowP 11
#define greenP 10

#define buttonC 3
#define crossC 4
#define redC 7
#define yellowC 6
#define greenC 5

#define delay_Time 500
#define green_Time 5
#define yellow_Time 3
#define red_Time 5

volatile bool button_stateP = false;
volatile bool button_stateC = false;

int seconds = 0;
LiquidCrystal lcd_1{47, 49, 51, 53, 52, 50};

int i = 0;
int Flag;
int Flag2;
int Light_State;

void setup() {

lcd_1.begin(16, 2);

 pinMode(crossP, OUTPUT);
 pinMode(redP, OUTPUT);
 pinMode(yellowP, OUTPUT);
 pinMode(greenP, OUTPUT);
 pinMode(buttonP, INPUT_PULLUP);

 pinMode(crossC, OUTPUT);
 pinMode(redC, OUTPUT);
 pinMode(yellowC, OUTPUT);
 pinMode(greenC, OUTPUT);
 pinMode(buttonC, INPUT_PULLUP);

 attachInterrupt(digitalPinToInterrupt(buttonP), setFlag1, CHANGE);
 attachInterrupt(digitalPinToInterrupt(buttonC), setFlag2, CHANGE);

 Serial.begin(9600);

 Flag = 0;
 Flag2 = 0;
}

void loop() {


  LOOP:
  //Green light
   digitalWrite(crossP, LOW);
   digitalWrite(redP, LOW);
   digitalWrite(yellowP, LOW);
   digitalWrite(greenP, HIGH);

   digitalWrite(crossC, LOW);
   digitalWrite(redC, HIGH);
   digitalWrite(yellowC, LOW);
   digitalWrite(greenC, LOW);

   for(i = 0; i <= green_Time; i++){
    delay(delay_Time);
    if(Flag == 1){
      Light_State = 1;
      Pedestrian();
      goto LOOP;
    }
    else if (Flag2 == 1) {
      Light_State = 3;
      Pedestrian2();
      goto LOOP;
    }
   }

  //Yellow light
   digitalWrite(yellowP, HIGH);
   digitalWrite(greenP, LOW);

   digitalWrite(yellowC, HIGH);
   digitalWrite(redC, LOW);
   for(i = 0; i <= red_Time; i++){
    delay(delay_Time);
    if(Flag == 1){
      Light_State = 2;
      Pedestrian();
      goto LOOP;
    } 
    else if (Flag2 == 1) {
      Light_State = 2;
      Pedestrian2();
      goto LOOP;
    }
   }

  //red light
   digitalWrite(yellowP, LOW);
   digitalWrite(redP, HIGH);

   digitalWrite(yellowC, LOW);
   digitalWrite(greenC, HIGH);
   for(i = 0; i <= yellow_Time; i++){
    delay(delay_Time);
    if(Flag == 1){
      Light_State = 3;
      Pedestrian();
      goto LOOP;
    } 
    else if (Flag2 == 1) {
      Light_State = 1;
      Pedestrian2();
      goto LOOP;
    }
 }
}

void setFlag1(void) 
{ Flag = 1; }

void setFlag2(void) 
{ Flag2 = 1; }

void Pedestrian(void){
  switch(Light_State){
    case 1: {//off green on yellow
      digitalWrite(greenP, LOW);
      digitalWrite(yellowP, HIGH);
      lcd_1.clear();
      lcd_1.print("Wait Pedestrian");

      digitalWrite(redC, LOW);
      digitalWrite(yellowC, HIGH);
      delay(2000);

      //set red on a pedestrian on
      digitalWrite(yellowP, LOW);
      digitalWrite(redP, HIGH);
      digitalWrite(crossP, HIGH);
      lcd_1.clear();
      lcd_1.print("Cross Pedestrian");

      digitalWrite(yellowC, LOW);
      digitalWrite(greenC, HIGH);

      delay(2000);
      break;
    }

    case 2: {//Yellow state
      delay(500);//keep yellow half a second
      delay(1000);

      //set red on a pedestrian on
      digitalWrite(yellowP, LOW);
      digitalWrite(redP, HIGH);
      digitalWrite(crossP, HIGH);
      lcd_1.clear();
      lcd_1.print("Cross Pedestrian");

      digitalWrite(yellowC, LOW);
      digitalWrite(greenC, HIGH);

      delay(5000);
      break;
    }

    case 3: {//Pedestrian on, red on
      digitalWrite(redP, HIGH);
      digitalWrite(crossP, HIGH);
      lcd_1.clear();
      lcd_1.print("Cross Pedestrian");

      digitalWrite(greenC, HIGH);

      delay(3000);
      break;
    }

    default:{};
  }
  for (i = 30; i>= 0; i--){
    digitalWrite(crossP, LOW);
    lcd_1.setCursor(0,1);
    lcd_1.print(i);
    delay(500);
    digitalWrite(crossP, HIGH);
    delay(500);
  
  }
  lcd_1.clear();
  Flag = 0;
  button_stateP = false;
}

void Pedestrian2(void) {
  switch(Light_State){
    case 1: {//off green on yellow
      digitalWrite(greenC, LOW);
      digitalWrite(yellowC, HIGH);
      lcd_1.clear();
      lcd_1.print("Wait Pedestrian");

      digitalWrite(redP, LOW);
      digitalWrite(yellowP, HIGH);
      delay(2000);

      //set red on a pedestrian on
      digitalWrite(yellowC, LOW);
      digitalWrite(redC, HIGH);
      digitalWrite(crossC, HIGH);
      lcd_1.clear();
      lcd_1.print("Wait Pedestrian");

      digitalWrite(yellowP, LOW);
      digitalWrite(greenP, HIGH);

      delay(5000);
      break;
    }

    case 2: {//Yellow state
      delay(500);//keep yellow half a second
      delay(1000);

      //set red on a pedestrian on
      digitalWrite(yellowC, LOW);
      digitalWrite(redC, HIGH);
      digitalWrite(crossC, HIGH);
      lcd_1.clear();
      lcd_1.print("Cross Pedestrian");

      digitalWrite(yellowP, LOW);
      digitalWrite(greenP, HIGH);

      delay(2000);
      break;
    }

    case 3: {//Pedestrian on, red on
      digitalWrite(redC, HIGH);
      digitalWrite(crossC, HIGH);
      lcd_1.clear();
      lcd_1.print("Cross Pedestrian");

      digitalWrite(greenP, HIGH);

      delay(2000);
      break;
    }

    default:{};
  }
  
  for (i = 30; i>= 0; i--){
    lcd_1.setCursor(0,1);
    digitalWrite(crossC, LOW);
    lcd_1.print(i);
    delay(500);
    digitalWrite(crossC, HIGH);
    delay(500);
    if (i <= 10){
      lcd_1.clear();
      for(i = 10; i>= 0; i--)
      {
    digitalWrite(crossC, LOW);
    lcd_1.print(i);
    delay(500);
    digitalWrite(crossC, HIGH);
    delay(500);
      }
    }
  }

  lcd_1.clear();
  Flag = 0;
  button_stateC = false;
}