#include <LiquidCrystal_I2C.h>
#define rled A0
#define bled A1

LiquidCrystal_I2C lcd(0x27,20,4);
unsigned int Pin[12]={11,2,3,4,5,6,7,8,9,10,13,12};
String name[12]={"0","1","2","3","4","5","6","7","8","9","dlt","Enter"};

uint8_t counter;
const unsigned long meterTimeOut=100000;
unsigned long pretime;
char receivedToken[20];

void setup()
{
  pinMode(A0,OUTPUT);
  pinMode(A1,OUTPUT);
  lcd.init();             
  lcd.backlight();
  loadingScreen();
  Serial.begin(9600); //set serial communication for diagnosisi
  for(int i=0;i<=11;i++)    //to set all led pin as output and inialite to low
  {
    pinMode(Pin[i],OUTPUT);
    digitalWrite(Pin[i],LOW);
  }
  Serial.println("setupdone now ready to receive token");
  counter =0;
  digitalWrite(rled,HIGH);
}

void loop()
{
  homescreen();
  digitalWrite(bled,LOW);
  if (Serial.available()) 
      {
        String fNum =Serial.readString();
        Serial.print("received :");
        Serial.println(fNum);
        if(fNum.toInt() == 2)    //THIS IS WAKEUP SOUND
        {
          digitalWrite(bled,HIGH);
          press("16");
          counter=0;
          Serial.print("READY TO RECEIVE YOUR TOKEN NUMBER");
          receiveKey();
        }
        lcd.clear();
      }
}  

void receiveKey()
{
    pretime=millis();
    updateToken();
    while(millis()-pretime < meterTimeOut)
    {
      if (Serial.available()) 
      {
        String cNum =Serial.readString();
        Serial.print("received :");
        Serial.println(cNum);

        if(cNum.toInt() == 15)
        {
          if(counter > 0)
          {
            press(cNum);
            counter--;
            lcd.setCursor(counter,2);
            lcd.print(" ");
            lcd.setCursor(counter,2);
          }
        }
        else
        {
            if(press(cNum)==HIGH)
            {
              counter++;
             // receivedToken[counter]=(cNum.toInt()-5)+'0';
            }
        }
        
        if(counter==20)
        {
            press("16");
            counter=0;
            succeedDisplay();
            for (int i = 0; i < 20; i++) 
            {
              receivedToken[i] = '\0';
            }
            break;
        }
        Serial.print("count is :");
        Serial.println(counter);
      }
    }
    Serial.print("LOOP FOR RECEIVING TOKEN TERMINATED");
}


bool press(String codeId) 
{
  uint8_t pinNumber;
  String pinName;
  switch(codeId.toInt())
  {
    case 5:
      pinNumber =Pin[0];
      pinName=name[0];
      break;
    case 6:
      pinNumber = Pin[1];
      pinName=name[1];
      break;
    case 7:
      pinNumber = Pin[2];
      pinName=name[2];
      break;
    case 8:
      pinNumber = Pin[3];
      pinName=name[3];
      break;
    case 9:
      pinNumber = Pin[4];
      pinName=name[4];
      break;
    case 10:
      pinNumber = Pin[5];
      pinName=name[5];
      break;
    case 11:
      pinNumber = Pin[6];
      pinName=name[6];
      break;
    case 12:
      pinNumber = Pin[7];
      pinName=name[7];
      break;
    case 13:
      pinNumber = Pin[8];
      pinName=name[8];
      break;
    case 14:
      pinNumber = Pin[9];
      pinName=name[9];
      break;
    case 15:
      pinNumber = Pin[10];
      pinName=name[10];
      break;
    case 16:
      pinNumber = Pin[11];
      pinName=name[11];
      break;
    default:
    return LOW;
  }
  digitalWrite(pinNumber,HIGH);
  Serial.print("Pin ");
  Serial.print(pinName);
  if(pinName!="dlt" && pinName!="Enter")
  lcd.print(pinName);
  Serial.println(" is pressed");
  delay(500);
  digitalWrite(pinNumber,LOW);
  delay(500);
  //updateToken();
  return HIGH;
}

void loadingScreen()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("VOICE BASE AUTOMATIC"); 
  lcd.setCursor(0,1);
  lcd.print("ELECTRIC TOKEN ENTRY"); 
  lcd.setCursor(0,2);
  lcd.print(" SYSTEM INITIALIZE ");
  lcd.setCursor(0,3);
  lcd.print("PLEASE WAIT");
  for(int k=11;k<20;k++)
  {
    lcd.setCursor(k,3);
    lcd.print(".");
    delay(500);
  }
}

void homescreen()
{
  //lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("VOICE BASE AUTOMATIC"); 
  lcd.setCursor(0,1);
  lcd.print("ELECTRIC TOKEN ENTRY"); 
  lcd.setCursor(0,2);
  lcd.print("SAY WAKE-UP SOUND TO");
  lcd.setCursor(0,3);
  lcd.print("INITIATE TOKEN ENRTY");
}

void updateToken()
{
  String Token;
  for(uint8_t i=0;i<20;i++)
  {
    Token=Token+String(receivedToken[i]);
  }
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("TOKEN RECEIVED IS:  "); 
  lcd.setCursor(0,1);
  lcd.print("--------<<>>--------"); 
  //lcd.print(Token); 
  lcd.setCursor(0,3);
  lcd.print("--------<<>>--------"); 
  lcd.setCursor(0,2);
}

  void succeedDisplay()
  {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("TOKEN RECEIVED IS:  "); 
  lcd.setCursor(0,1);
  lcd.print("--------<<>>--------"); 
  lcd.setCursor(0,2);
  lcd.print("   TOKEN ACCEPTED   "); 
  lcd.setCursor(0,3);
  lcd.print("--------<<>>--------"); 
  delay(3000);
  }