#include <LiquidCrystal.h>
#include <Keypad.h>

int f, t;
String nums = {"0123456789"};
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

bool isIn(char x, String y){
  for(char i : y) if(i == x) return true;
  return false;
}

String getCode() {
  lcd.setCursor(0, 0);
  String result = "";
  while (result.length() < 7) {
    char key = keypad.getKey();
    if(isIn(key, nums)){
      lcd.print(key);
      result += key;
    }
  }
  return result;
}

bool bombPlanted(String code) {return (code == "7355608") ? true : false;}

void setup(){
  lcd.begin(16, 2);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  f = 0; t= 0;
}

void loop(){
  String code = getCode();
  if(bombPlanted(code)){
    lcd.clear();
    lcd.setCursor(2, 0);
    lcd.print("Bomb Has Been");
    lcd.setCursor(5, 1);
    lcd.print("Planted!");
    t = 0;
    while(t <= 77){
      f = 3000 + 0.5*t;
      tone(13, f, 125);
      analogWrite(6, 255);
      delay(500 - 6.5*t);
      analogWrite(6, 0);
      delay(500 - 6.5*t);
      t++;
    }
    lcd.clear();
  }
  else{
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Wrong Code!");
    delay(1000);
    lcd.clear();
  }
}