#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include<EEPROM.h>




int hrs = 0;
int Min = 0;
int sec = 0;

unsigned int check_val = 50;
int add_chk = 0;
int add_hrs = 1;
int add_min = 2;

bool RUN = true;
bool complete = false;
bool min_flag = true;
bool hrs_flag = true;

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

unsigned long startMillis;  //some global variables available anywhere in the program
unsigned long currentM;
const unsigned long period = 1000;  //the value is a number of milliseconds


uint8_t state;
uint8_t valIndex;
uint8_t cursorPos;
char entered_value [6];
const uint8_t ROWS = 4;
const uint8_t COLS = 4;

const String password = "123456"; // change your password here
String input_password;

char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
uint8_t colPins[COLS] = { 13, 12, 14, 27 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 4, 0, 2, 15 }; // Pins connected to R1, R2, R3, R4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);


void setup() {
  // put your setup code here, to run once:
  startMillis = millis();  //initial start time
if (EEPROM.read(add_chk) != check_val) {
    EEPROM.write(add_chk, check_val);
    EEPROM.write(add_hrs, 0);
    EEPROM.write(add_min, 10);
  } else {
    hrs = EEPROM.read(add_hrs);
    Min = EEPROM.read(add_min);
  }

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  Wire.begin(18, 17);
  lcd.init();
  lcd.backlight();

}

void loop() {
  if(RUN) lcd.print("Defuse The Bomb!");
    while (RUN) {

currentM = millis();  //get the current "time" (actually the number of milliseconds since the program started)
  if (currentM - startMillis >= period)  //test whether the period has elapsed
  {
      sec = sec - 1;   
  startMillis = currentM;  //IMPORTANT to save the start time of the current LED state.

      if (sec == -1) {
        sec = 59;
        Min = Min - 1;
      }
      if (Min == -1){
        Min = 59;
        hrs = hrs - 1;
      }
      if (hrs == -1) hrs = 0;

      lcd.setCursor(4, 1);
      if (hrs <= 9) {
        lcd.print('0');
      }
        lcd.print(hrs);
        lcd.print(':');
      if (Min <= 9){
        lcd.print('0');
      }
        lcd.print(Min);
        lcd.print(':');
      if (sec <= 9) {
        lcd.print('0');
      }
        lcd.print(sec);
      lcd.setCursor(0, 2);
      lcd.print("Enter Code:");

    if(complete == true) {
      lcd.clear();
      lcd.print("Bomb Defused!!!");
      RUN = !RUN;
      lcd.setCursor(0,1);
      lcd.print("Restart via UI");
      delay(1000);
      break;
    }
      
      if (hrs == 0 && Min == 0 && sec == 0) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("    TIMES UP    ");
        RUN = false;
        INIT();
      }
}
            getInput();
    }



}

void nextChar(char key)
{
  if (valIndex < 6)
  {
    entered_value[valIndex] = key;
    lcd.setCursor(0, 3);
    lcd.print(entered_value);
    Serial.println(entered_value);
    cursorPos++;
    valIndex++;
    input_password += key;
  }
}

void eraseChar()
{
  if (valIndex > 0 )
  {
    valIndex--;
    cursorPos--;
    entered_value[valIndex] = '\0';
  }
      lcd.setCursor(cursorPos, 3);
    lcd.print(' ');
    lcd.setCursor(cursorPos, 3);
}

void eraseAll()
{
  while(valIndex > 0 )
  {
    valIndex--;
    cursorPos--;
    entered_value[valIndex] = '\0';
    lcd.setCursor(cursorPos, 3);
    lcd.print(' ');
    lcd.setCursor(cursorPos, 3);
  }
  input_password = "";
}

void getInput() {
  char key = keypad.getKey();
  switch(key)
  {
    case 'A':
      RUN = true;
      INIT();
      break;
    case '#':
      checkCode();
      break;
    case '*':
      eraseChar();
      break;
    default:
      if (isDigit(key))
      {
        nextChar(key);
      }
      break;
  }
}
void checkCode() {
  if(input_password == password) {
    Serial.println("Riktig KODE!!!");
    complete = true;
  }
  else {
    Serial.println("Feil kode!!!");
    lcd.setCursor(0, 2);
    lcd.print("Wrong Code!");
    eraseAll();
    delay(1000);
  }
}

void INIT() {
  hrs = EEPROM.read(add_hrs);
  Min = EEPROM.read(add_min);
  sec = 0;
  lcd.setCursor(4, 0);
  if (hrs <= 9) {
    lcd.print('0');
  }
    lcd.print(hrs);
    lcd.print(':');
  if (Min <= 9) {
    lcd.print('0');
  }
    lcd.print(Min);
    lcd.print(':');
  if (sec <= 9) {
    lcd.print('0');
  }
    lcd.print(sec);
  
  min_flag = true;
  hrs_flag = true;
  delay(50);
}