//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <EEPROM.h>



LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
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' }
};
int i=0;
int password[4];
int newP[8];
int j=0;
int database[4];
char key;
int startF=0;
int changef;
int newpassword=0;


uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
int authF=0;
void mainScreen(){
   lcd.setCursor(0,0);
  lcd.print("A-start.        ");
   lcd.setCursor(0,2);
  lcd.print("B-change password.");

}
void start(){
   lcd.setCursor(0,0);
  lcd.print("T=30.7C");
  
  lcd.print("      H=77.2%");
   lcd.setCursor(0,1);
  lcd.print("CO2=120");
    lcd.print("      BT=37.5");
   lcd.setCursor(0,2);
  lcd.print("dirty=true.");
     lcd.setCursor(0,3);
     lcd.print("cry=true.");
     lcd.setCursor(13,3);
     lcd.print("1-stop.");
        key = keypad.getKey();

  if (key != NO_KEY) {
    
    if(key=='1'){
        lcd.clear();

      startF=0;
    }


  }

}
void showStartupMessage() {
  lcd.setCursor(4, 0);
  lcd.print("Baby Care");
 
  delay(1000);

  lcd.setCursor(4, 2);
  String message = "Welcome!";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }
  delay(500);
}
void setup()
{
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
   showStartupMessage() ;
     lcd.clear();
       Serial.begin(9600);
         EEPROM.write(0, 1);

EEPROM.write(1, 2);

EEPROM.write(2, 3);

EEPROM.write(3, 4);





}
bool compare(int a[8]){
  if(a[0]==a[4]&&a[1]==a[5]&&a[2]==a[6]&&a[3]==a[7])
  return true;
  else
 return false;
}

void authScreen(){
  lcd.setCursor(0,0);
  lcd.print("enter password");
    lcd.setCursor(4,3);
      lcd.print("_  _  _  _");
        
           key = keypad.getKey();
   
       if (key != NO_KEY){
         password[i]=key-48;
           lcd.setCursor(4+(3*i),2);  

              lcd.print("*  ");
         i++;
         if(i==4){
           for(int i=0;i<4;i++){
  database[i]=EEPROM.read(i);

}
          
         if(password[0]==database[0]&&password[1]==database[1]&&password[2]==database[2]&&password[3]==database[3]){
           lcd.clear();
           lcd.print("correct");
           i=0;
           delay(2000);
           startF=1;
           lcd.clear();
         }
         else {
           i=0;
           lcd.clear();
           lcd.print("wrong");
           delay(1000);
         }}
       }
}
void changeScreen(){
  lcd.setCursor(0,0);
  lcd.print("enter old password");
    lcd.setCursor(4,3);
      lcd.print("_  _  _  _");
        
           key = keypad.getKey();
   
       if (key != NO_KEY){
         password[i]=key-48;
           lcd.setCursor(4+(3*i),2);  

              lcd.print("*  ");
         i++;
         if(i==4){
           for(int i=0;i<4;i++){
  database[i]=EEPROM.read(i);

}
          
         if(password[0]==database[0]&&password[1]==database[1]&&password[2]==database[2]&&password[3]==database[3]){
           lcd.clear();
           i=0;
           newpassword=1;
           changef=0;
             }
         else {
           i=0;
           lcd.clear();
           lcd.print("wrong");
           delay(1000);
         }}
       }
}
void newPassword(){
             lcd.setCursor(0,0);
             if(j==0)
             lcd.print("enter new password");
             else             
              lcd.print("confirm password  ");

    lcd.setCursor(4,3);
      lcd.print("_  _  _  _");
        
           key = keypad.getKey();
          
       if(i==4){
         j=1;
         lcd.setCursor(0,2);
         lcd.print("               ");
         

       }
       if(i==8){
        boolean check=compare(newP);
         
         if(check==true){
          for(int i=0;i<4;i++){
            EEPROM.write(i,newP[i]);
           
          }
           i=0;
          newpassword=0;
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print("password changed");
          delay(1000);
         }
         else { 
           i=0;
           lcd.clear();
           lcd.print("wrong");
           delay(1000);}
           
       }
       if (key != NO_KEY){
         newP[i]=key-48;
         if(j==0)
           lcd.setCursor(4+(3*i),2);  
         else
         lcd.setCursor(4+(3*(i-4)),2);  
 
              lcd.print("*  ");
         i++;
         
           
         }
}
void loop()
{
  if(startF==1){
    authF=0;
    changef=0;
    start();
  }
  if(newpassword==1){
    newPassword();
  }
  if(changef==1){
    
    changeScreen();
  }
  if(authF==0&&startF==0&&changef==0&&newpassword==0){
mainScreen();
}
 if(authF==1){
authScreen();}
   key = keypad.getKey();

  if (key != NO_KEY) {
    
    if(key=='A'){
        lcd.clear();

      authF=1;
    }
      if(key=='B'){
        lcd.clear();

      changef=1;
    }
  }
}