#include <LiquidCrystal.h>

#define CONFIRM 2
#define ADD_LOGIN 13
#define LOGINS 10

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

typedef enum {
  NAME_PASS,
  ADD,
  LOGIN,
  LOGGED_IN
} State;

State locker_sts;

String user_name = "";
String user_passw = "";

String* logins[LOGINS];
int index = 0;

bool name=false;

void setup() {
  pinMode(CONFIRM, INPUT_PULLUP);
  pinMode(ADD_LOGIN, INPUT_PULLUP);
  lcd.begin(20, 4);
  Serial.begin(9600);
  Serial.println("");
  locker_sts = NAME_PASS;
}

bool confirm_login(String& name, String& passw){
  for(int i=0; i<LOGINS; i++){
    if(name == logins[i][0] && passw == logins[i][1]){
      return true;
    }
  }
  return false;
}

String* name_pass() {
  static String login[2]; 
  lcd.setCursor(3, 0);
  lcd.print("CREATE ACCOUNT");
  lcd.setCursor(0, 1);
  lcd.print("LOGIN: ");
  if(digitalRead(CONFIRM) == LOW){
    if(!name && user_name.length() > 0){
      name = true;
      login[0] = user_name;
      lcd.setCursor(0, 2);
      lcd.print("PASS: ");
    }
    else if(name && user_passw.length() > 0){
      locker_sts = LOGIN;
      login[1] = user_passw;
      lcd.clear();
      clear_np();
      return login;
    }
  } 
  if (Serial.available()) {
    char aux = Serial.read();
    if(!name){
      user_name += aux;
      lcd.setCursor(7, 1);
      lcd.print(user_name);
    }
    else{
      lcd.setCursor(6, 2);
      user_passw += aux;
      lcd.print(user_passw);
    }
  }
}

void login(){
  lcd.setCursor(0, 0);
  lcd.print("PLEASE, INSERT LOGIN");
  lcd.setCursor(0, 1);
  lcd.print("LOGIN: ");
  if(digitalRead(CONFIRM) == LOW){
    if(!name && user_name.length() > 0){
      name = true;
      lcd.setCursor(0, 2);
      lcd.print("PASS: ");
    }
    else if(name && user_passw.length() > 0){
      lcd.clear();
      if(confirm_login(user_name, user_passw)){
        locker_sts = LOGGED_IN;
        lcd.print("OK");
        delay(1000);
        lcd.clear();
      }
      else{
        lcd.print("No");
        clear_np();
      }
    }
  } 
  if (Serial.available()) {
    char aux = Serial.read();
    if(!name){
      user_name += aux;
      lcd.setCursor(7, 1);
      lcd.print(user_name);
    }
    else{
      lcd.setCursor(6, 2);
      user_passw += aux;
      lcd.print(user_passw);
    }
  }
};

void clear_np(){
  user_name = "";
  user_passw = "";
  name = false;
}

void add(){
  clear_np();
  lcd.clear();
  locker_sts = NAME_PASS;
  index++;
}

void logged(){
  lcd.setCursor(0, 0);
  lcd.print("Vai se fuder " + user_name);
  delay(2000);
  lcd.setCursor(0, 1);
  lcd.print("Saindo da conta...");
  delay(1200);
  locker_sts = LOGIN;
  lcd.clear();
  clear_np();
}

void loop() {
  if(digitalRead(ADD_LOGIN) == LOW){
    if(locker_sts == ADD) locker_sts = LOGIN;
    else if(locker_sts == LOGIN) locker_sts = ADD;
  }
  switch (locker_sts) {
    case NAME_PASS:
      logins[index] = name_pass();
      break;
    case LOGIN:
      login();
      break;
    case ADD:
      add();
      break;
    case LOGGED_IN:
      logged();
      break;
  }
}