// Matthias Jiménez Villamar
// Security Pass Anti-threat (SPAT)
// 15/07/2025

//MJ

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

String pass = "123ABC", enteredPass="";
int intentosFallidos = 0, intentosTotales = 0;
unsigned long startTime;
const int TIME_LIMIT = 10000; 
const int pinRed = 35, pinGreen = 37, pinBlue = 39;

const byte rows = 4, cols = 4;
byte RowsPin[] = {9, 8, 7, 6};
byte ColsPin[] = {5, 4, 3, 2};
char keys[4][4] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
Keypad keyPad=Keypad(makeKeymap(keys), RowsPin, ColsPin, rows, cols);
LiquidCrystal screen(13, 12, 22, 24, 26, 28);

void setup() {
  pinMode(pinRed, OUTPUT);
  pinMode(pinGreen, OUTPUT);
  pinMode(pinBlue, OUTPUT);
  Serial.begin(9600);
  screen.begin(20, 4);
  screen.setCursor(2, 1);screen.print("PROFESSIONAL SPAT");
  screen.setCursor(5, 2);screen.print("ENTERPRISE");
  delay(800);
  screen.clear();
  startTime=millis();
}

void loop(){
  mostrarTiempoRestante();
  screen.setCursor(0, 0);screen.print("Enter Key: ");

  char pressKey = keyPad.getKey();
  if (pressKey){
    enteredPass += pressKey;
    screen.setCursor(enteredPass.length() - 1, 1);
    screen.print("*");
    if (enteredPass.length() == pass.length()) {
      checkPass();
    }
  }
  if((millis()-startTime)>=TIME_LIMIT) {
    bloquearSistema();
  }
}

void checkPass() {
  screen.clear();
  if (enteredPass == pass) {
    screen.setCursor(6, 1);
    screen.print("CORRECT!!");
    colors(0, 0, 255);
    delay(800);
    colors(0, 0, 0);
    intentosFallidos=0;
    Serial.print(++intentosTotales); 
    Serial.print(": TRUE: "); 
    Serial.println(enteredPass);
  } else {
    screen.setCursor(5, 1);
    screen.print("INCORRECT!!");
    colors(0, 0, 255);
    delay(800);
    colors(0, 0, 0);
    intentosFallidos++;
    Serial.print(++intentosTotales); 
    Serial.print(": FALSE: "); 
    Serial.println(enteredPass);
    if(intentosFallidos==3){bloquearSistema();}
  }
  enteredPass="";
  screen.clear();
  startTime=millis();
}

void mostrarTiempoRestante() {
  unsigned long elapsed=millis()-startTime;
  unsigned long remaining=(TIME_LIMIT - elapsed);
  screen.setCursor(0, 3);
  screen.print("Time --> ");
  screen.print(remaining / 1000);
  screen.print("s. ");
  screen.print(remaining % 1000);
  screen.print("ms. ");
}

void bloquearSistema() {
  screen.clear();
  Serial.println("\n===== System Blocked =====");
  Serial.println("A Safety Method By Matthias Jiménez V. \n");
  Serial.println("This block, could has started by four causes:");
  Serial.println("   - The waiting time has ended.");
  Serial.println("   - You've entered the wrong key 3 TIMES.");
  Serial.println("   - You're Stupid");
  Serial.println("   - You don't have any idea about the password.");
  screen.setCursor(3, 0);screen.print("System Blocked");
  screen.setCursor(0, 2);screen.print("Generating Code ...");
  screen.setCursor(18, 3);screen.print("MJ");
  colors(255, 0, 0);
  delay(1000);
  screen.setCursor(0, 2);screen.print("Code: 500xKey       ");
  while(true){
    colors(255, 0, 0); 
    delay(500);
    colors(0, 0, 0); 
    delay(500);
  }
}

void colors(int red, int green, int blue){
  analogWrite(pinRed, red);
  analogWrite(pinGreen, green);
  analogWrite(pinBlue, blue);
}