---

#include <Wire.h>
#include <Servo.h>
#include <virtuabotixRTC.h>

#define SLAVE_ADDR 8

const int BTN1 = 9;
const int BTN2 = 10;
const int BTN3 = 11;
const int BTN4 = 13;
const int BTN_AWAY = 3;

const int LED_RED   = 4;
const int LED_GREEN = 5;
const int SERVO_PIN = 6;
const int BUZZER    = 7;
const int MIC_PIN   = A0;

const int RTC_RST = 2;
const int RTC_CLK = 8;
const int RTC_DAT = 12;

Servo doorServo;
virtuabotixRTC myRTC(RTC_CLK, RTC_DAT, RTC_RST);

const int secretCode[4] = {1, 2, 3, 4};
int enteredStep = 0;

bool systemUnlocked = false;
bool awayMode = false;

unsigned long lastPressTime = 0;
const unsigned long debounceDelay = 250;

unsigned long lastSyncTime = 0;
const unsigned long syncInterval = 500;

void setup() {
  Serial.begin(9600);
  Wire.begin();

  pinMode(BTN1, INPUT_PULLUP);
  pinMode(BTN2, INPUT_PULLUP);
  pinMode(BTN3, INPUT_PULLUP);
  pinMode(BTN4, INPUT_PULLUP);
  pinMode(BTN_AWAY, INPUT_PULLUP);

  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  doorServo.attach(SERVO_PIN);
  doorServo.write(0);

  // myRTC.setDS1302Time(0, 30, 14, 5, 30, 10, 2026);

  digitalWrite(LED_RED, HIGH);
  digitalWrite(LED_GREEN, LOW);

  Serial.println(F("Zhuye kulyptaldy. PIN-kodty retimen teriniz."));
}

void loop() {
  if (!systemUnlocked) {
    checkPinEntry();
  } else {
    handleAwayMode();

    if (millis() - lastSyncTime > syncInterval) {
      lastSyncTime = millis();
      sendStatusToSlave();
      readSlaveSensors();
    }
  }
  delay(30);
}

void checkPinEntry() {
  int pressed = 0;
  if (digitalRead(BTN1) == LOW) pressed = 1;
  else if (digitalRead(BTN2) == LOW) pressed = 2;
  else if (digitalRead(BTN3) == LOW) pressed = 3;
  else if (digitalRead(BTN4) == LOW) pressed = 4;

  if (pressed != 0 && millis() - lastPressTime > debounceDelay) {
    lastPressTime = millis();

    if (pressed == secretCode[enteredStep]) {
      enteredStep++;
      tone(BUZZER, 1500, 100);

      if (enteredStep == 4) {
        unlockSystem();
      }
    } else {
      enteredStep = 0;
      tone(BUZZER, 300, 400);
      Serial.println(F("Kate PIN! Kayta teriniz."));
    }
  }
}

void unlockSystem() {
  systemUnlocked = true;
  enteredStep = 0;

  digitalWrite(LED_RED, LOW);
  digitalWrite(LED_GREEN, HIGH);
  doorServo.write(90);
  tone(BUZZER, 2000, 300);

  Serial.println(F("PIN durys! Zhuye belsendirildi."));
}

void handleAwayMode() {
  if (digitalRead(BTN_AWAY) == LOW && millis() - lastPressTime > debounceDelay) {
    lastPressTime = millis();
    awayMode = !awayMode;
    digitalWrite(LED_GREEN, awayMode ? LOW : HIGH);
    tone(BUZZER, awayMode ? 1800 : 1200, 150);
    Serial.println(awayMode ? F("Away KOSYLDY") : F("Away OSHIRILDI"));
  }

  if (awayMode) {
    int soundLevel = analogRead(MIC_PIN);
    if (soundLevel > 600) {
      tone(BUZZER, 2500, 1000);
      Serial.println(F("DABYL! Away kezinde dybys anyktaldy!"));
    }
  }
}

void sendStatusToSlave() {
  Wire.beginTransmission(SLAVE_ADDR);
  Wire.write(systemUnlocked ? 1 : 0);
  Wire.endTransmission();
}

void readSlaveSensors() {
  Wire.requestFrom(SLAVE_ADDR, 2);
  if (Wire.available() == 2) {
    int temp = Wire.read();
    int hum  = Wire.read();
    Serial.print(F("Slave -> Temp: "));
    Serial.print(temp);
    Serial.print(F(" C, Hum: "));
    Serial.print(hum);
    Serial.println(F(" %"));
  }
}