#include "DHTesp.h"

// Pin Definitions
#define DHT_PIN 15
#define PIR_PIN 13
#define LIGHT 2
#define FAN 4
#define BUZZER 18

DHTesp dht;

// Timer variables
unsigned long lastMotionTime = 0;
bool lightState = false;

// Mode control
bool autoMode = true;

void setup() {
  Serial.begin(115200);

  pinMode(PIR_PIN, INPUT);
  pinMode(LIGHT, OUTPUT);
  pinMode(FAN, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  dht.setup(DHT_PIN, DHTesp::DHT22);

  Serial.println("===== SMART HOME AUTOMATION =====");
  Serial.println("A → Auto Mode | M → Manual Mode");
  Serial.println("1/2 → Light ON/OFF");
  Serial.println("3/4 → Fan ON/OFF");
  Serial.println("5/6 → Buzzer ON/OFF");
}

void loop() {

  // ===============================
  // 📥 MANUAL INPUT
  // ===============================
  if (Serial.available()) {
    char cmd = Serial.read();

    if (cmd == 'A') autoMode = true;
    if (cmd == 'M') autoMode = false;

    if (!autoMode) {
      if (cmd == '1') digitalWrite(LIGHT, HIGH);
      if (cmd == '2') digitalWrite(LIGHT, LOW);
      if (cmd == '3') digitalWrite(FAN, HIGH);
      if (cmd == '4') digitalWrite(FAN, LOW);
      if (cmd == '5') digitalWrite(BUZZER, HIGH);
      if (cmd == '6') digitalWrite(BUZZER, LOW);
    }
  }

  // ===============================
  // 🤖 AUTO MODE
  // ===============================
  if (autoMode) {

    float temp = dht.getTemperature();
    int motion = digitalRead(PIR_PIN);

    // 💡 TIMER LIGHT
    if (motion == HIGH) {
      digitalWrite(LIGHT, HIGH);
      lastMotionTime = millis();
      lightState = true;
    }

    if (lightState && millis() - lastMotionTime > 10000) {
      digitalWrite(LIGHT, LOW);
      lightState = false;
    }

    // 🌡️ FAN CONTROL
    if (temp < 25) digitalWrite(FAN, LOW);
    else digitalWrite(FAN, HIGH);

    // 🔔 BUZZER
    digitalWrite(BUZZER, motion);

    // 📊 SERIAL OUTPUT
    Serial.println("------ SYSTEM STATUS ------");
    Serial.println("Mode: AUTO");

    Serial.print("Temp: ");
    Serial.print(temp);
    Serial.println(" °C");

    Serial.print("Motion: ");
    Serial.println(motion ? "YES" : "NO");

    Serial.print("Light: ");
    Serial.println(lightState ? "ON" : "OFF");

    Serial.print("Fan: ");
    Serial.println(temp < 25 ? "OFF" : "ON");

    Serial.print("Buzzer: ");
    Serial.println(motion ? "ON" : "OFF");

    Serial.println("---------------------------\n");
  }

  // ===============================
  // 🎮 MANUAL MODE DISPLAY (ADDED)
  // ===============================
  if (!autoMode) {
    Serial.println("------ SYSTEM STATUS ------");
    Serial.println("Mode: MANUAL");

    Serial.print("Light: ");
    Serial.println(digitalRead(LIGHT) ? "ON" : "OFF");

    Serial.print("Fan: ");
    Serial.println(digitalRead(FAN) ? "ON" : "OFF");

    Serial.print("Buzzer: ");
    Serial.println(digitalRead(BUZZER) ? "ON" : "OFF");

    Serial.println("---------------------------\n");
  }

  delay(1000);
}