#include <Keypad.h>
#include <TM1637Display.h>
#include <Servo.h>

#define CLK 2
#define DIO 3
#define RELAY 4
#define SERVO_PIN 5
#define BUZZER 6
#define RESET_BTN 7
#define OPEN_BTN 8

TM1637Display display(CLK, DIO);
Servo servoMotor;

const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = {9,10,11,12};
byte colPins[COLS] = {A0,A1,A2,A3};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String validCodes[] = {"1234", "5678", "2468"};
int totalUsers = 3;

int melody1[] = {262,330,392,523,0};
int melody2[] = {330,349,440,494,0};
int melody3[] = {392,440,494,587,0};

String inputCode = "";
bool codeEntered = false;
bool blocked = false;
unsigned long lastStarPress = 0;

void setup() {
  pinMode(RELAY, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(RESET_BTN, INPUT_PULLUP);
  pinMode(OPEN_BTN, INPUT_PULLUP);

  digitalWrite(RELAY, LOW);

  display.setBrightness(7);
  display.clear();

  servoMotor.attach(SERVO_PIN);
  servoMotor.write(0);
}

void loop() {

  if (digitalRead(OPEN_BTN) == LOW) {
    openDoor();
    delay(500);
  }

  if (digitalRead(RESET_BTN) == LOW) {
    resetSystem();
    delay(500);
  }

  char key = keypad.getKey();

  if (key) {


    if (key >= '0' && key <= '9' && inputCode.length() < 4 && !blocked) {
      inputCode += key;
      display.showNumberDec(inputCode.toInt(), true);
    }

    
    if (key == '#' && !blocked) {
      codeEntered = true;
      checkCode();
    }

    if (key == '*' && !codeEntered && !blocked) {
      if (millis() - lastStarPress < 500) {
        resetSystem();
      }
      lastStarPress = millis();
    }
  }
}

void checkCode() {

  for (int i=0; i<totalUsers; i++) {
    if (inputCode == validCodes[i]) {
      if(i==0) playMelody(melody1);
      if(i==1) playMelody(melody2);
      if(i==2) playMelody(melody3);

      openDoor();
      resetSystem();
      return;
    }
  }

  alarmSound();
  blocked = true;
}

void openDoor() {

  digitalWrite(RELAY, HIGH);

  servoMotor.write(180);
  delay(800);
  servoMotor.write(0);
  delay(800);

  digitalWrite(RELAY, LOW);
}

void playMelody(int melody[]) {
  for(int i=0; melody[i] != 0; i++){
    tone(BUZZER, melody[i], 200);
    delay(250);
  }
  noTone(BUZZER);
}

void alarmSound() {
  for(int i=0;i<3;i++){
    tone(BUZZER, 1000);
    delay(300);
    noTone(BUZZER);
    delay(200);
  }
}

void resetSystem() {
  inputCode = "";
  codeEntered = false;
  blocked = false;
  display.clear();
}