#include <WiFi.h>
#include "AdafruitIO_WiFi.h"
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <LiquidCrystal.h>

// Adafruit IO credentials
#define IO_USERNAME  "Ivan"
#define IO_KEY       "aio_QMzQ92eHSoN0hRHBoVN63GRfTvce"

// Wi-Fi credentials
#define WIFI_SSID    "Wokwi-GUEST"
#define WIFI_PASS    ""

// Hardware configuration
#define DHTPIN    23         // DHT22 data pin
#define DHTTYPE   DHT22      // DHT 22 (AM2302)
#define LDR_PIN   34         // Photoresistor analog pin
#define BUZZER_PIN 27        // Buzzer pin (active buzzer)
#define RELAY_PIN  32        // Relay control pin

// Thresholds for alarm
const float TEMP_THRESHOLD = 30.0;    // e.g., 30°C threshold for temperature
const float HUM_THRESHOLD  = 80.0;    // e.g., 80% threshold for humidity

// Initialize sensor and Adafruit IO
DHT dht(DHTPIN, DHTTYPE);
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);
AdafruitIO_Feed *temperatureFeed = io.feed("temperature");
AdafruitIO_Feed *humidityFeed    = io.feed("humidity");

// Initialize LCD (16x2) with specified interface pins
LiquidCrystal lcd(12, 13, 14, 15, 16, 17);

void setup() {
  Serial.begin(115200);
  // Initialize pins
  pinMode(LDR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);
  digitalWrite(RELAY_PIN, LOW);

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("Connecting...");

  // Start DHT sensor
  dht.begin();

  // Connect to Wi-Fi and Adafruit IO
  Serial.print("Connecting to Adafruit IO...");
  io.connect();
  // Wait for connection to Adafruit IO
  while(io.status() < AIO_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println(" Connected to Adafruit IO!");
  lcd.clear();
  lcd.print("IO Connected!");
  delay(500);
}

void loop() {
  // Maintain Adafruit IO connection
  io.run();

  // Read sensors
  float temperature = dht.readTemperature();  // Celsius
  float humidity    = dht.readHumidity();
  int lightValue    = analogRead(LDR_PIN);

  // Validate DHT readings
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT22 sensor!");
    return;  // skip sending if read failed
  }

  // Print readings to Serial (optional debugging/logging)
  Serial.print("Temp: "); Serial.print(temperature); Serial.print(" °C, ");
  Serial.print("Hum: "); Serial.print(humidity); Serial.print(" %, ");
  Serial.print("Light: "); Serial.println(lightValue);

  // Update LCD display
  lcd.setCursor(0, 0);
  lcd.print("Temp: "); 
  lcd.print(temperature, 1);  // one decimal place
  lcd.print(" C   ");         // add spaces to overwrite any leftover chars

  lcd.setCursor(0, 1);
  lcd.print("Hum:  "); 
  lcd.print(humidity, 1);
  lcd.print(" %   ");

  // Alarm conditions for buzzer and relay
  if (temperature > TEMP_THRESHOLD || humidity > HUM_THRESHOLD) {
    digitalWrite(BUZZER_PIN, HIGH);  // activate buzzer
    digitalWrite(RELAY_PIN, HIGH);   // activate relay
  } else {
    digitalWrite(BUZZER_PIN, LOW);   // deactivate buzzer
    digitalWrite(RELAY_PIN, LOW);    // deactivate relay
  }

  // Publish data to Adafruit IO feeds
  temperatureFeed->save(temperature);
  humidityFeed->save(humidity);

  // Small delay to avoid flooding (publish roughly every 2 seconds)
  delay(2000);
}