#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <EEPROM.h>
const uint8_t rows=4;
const  uint8_t cols=4;
char keys [rows][cols]{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
#define lcd_address 0x27
#define lcd_width 16
#define lcd_length  2
#define ledpin   13
#define buzzpin 12
int i;
int wrong_time;
char key;
char saved_password[6];
char input[6];
char new_password[6];
uint8_t colspin[cols] ={5,4,3,2};
uint8_t rowspin[rows]={10,9,8,7};
Keypad keypad = Keypad(makeKeymap(keys),rowspin,colspin ,rows,cols);
LiquidCrystal_I2C lcd(lcd_address,lcd_width,lcd_length);
void setup() {
  // put your setup code here, to run once:
pinMode(ledpin, OUTPUT);

lcd.init();
lcd.backlight();
pinMode(buzzpin, OUTPUT);
if(EEPROM.read(10)!=1 ){
setNewPassword();}/*
if(EEPROM.read(10)!=1){
  lcd.setCursor(0,0);
  lcd.print("set the password");
 
    for(i=0;i<5;i++){
       while(true){
      char key = keypad.getKey();
      if(key!=NO_KEY){
        new_password[i]=key;
        EEPROM.write(i,new_password[i]);
        lcd.setCursor(i,1);
        lcd.print("*");
        delay(300);
        break;
        }
        }
        
      }
      new_password[5]='\0';
      EEPROM.write(10,1);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("password is set");
      delay(2000);
    }*/
  }


void loop() {
  // put your main code here, to run repeatedly:
  if(wrong_time >=3){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("system is lock");
    lcd.setCursor(0,1);
    lcd.print("try again in 10s");
    delay(1000);
  }
  if(wrong_time >=5){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("change password");
    lcd.setCursor(0,1);
    lcd.print("push the * button");
    delay(500);
    while(true){
    key=keypad.getKey();
    if(key == '*'){
    wrong_time=0;
    setNewPassword();
    break;}}
  }
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("enter password");
  for(i=0;i<5;i++){
    while(true){
       char key=keypad.getKey() ;
      if(key!=NO_KEY){
        input[i]=key;
        lcd.setCursor(i,1);
        lcd.print("*");
        delay(300);
        break;
      }
    }
  }
input[5]='\0';
for(i=0;i<5;i++){
  saved_password[i]=EEPROM.read(i);
}
saved_password[5]='\0';

if(strcmp(saved_password,input)==0){
  digitalWrite(ledpin, HIGH);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("right password");
  delay(200);
  lcd.setCursor(0,1);
  lcd.print("Access granted");
  delay(200);
  delay(5000);
  digitalWrite(ledpin, LOW);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Access timeout");
  delay(500);
  
}else{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("wrong password");
  wrong_time++;
  digitalWrite(buzzpin, HIGH);
  delay(200);
  digitalWrite(buzzpin, LOW);
  delay(200);
  lcd.setCursor(0,1);
  lcd.print("try again");
  delay(200);
}

}
void setNewPassword() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("set the password");
  for(i=0;i<5;i++){
    while(true){
      char key = keypad.getKey();
      if(key!=NO_KEY){
        new_password[i]=key;
        EEPROM.update(i,new_password[i]);
        lcd.setCursor(i,1);
        lcd.print("*");
        delay(300);
        break;
      }
    }
  }
  new_password[5]='\0';
  EEPROM.write(10, 1);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("password is set");
  delay(2000);
}