#include <MQUnifiedsensor.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>

// Configuración de pines
const int gasSensorPin = 34;
const int resetButtonPin = 32;
const int buzzerPin = 26;
const int greenLedPin = 27;
const int yellowLedPin = 14;
const int redLedPin = 12;
const int tempSensorPin = 33;
const int smokeSensorPin = 35;
const float gasThreshold = 200.0;
const float tempThreshold = 40.0;
const float smokeThreshold = 300.0;

// Configuración de la pantalla LCD 20x4
LiquidCrystal_I2C lcd(0x27, 22, 21);  // Dirección I2C 0x27

// Configuración del sensor de temperatura DHT
#define DHTTYPE DHT22
DHT dht(tempSensorPin, DHTTYPE);

// Configuración de WiFi
const char* ssid = "Tenda_5181E0_5G";
const char* password = "zxcv1234";
const char* iftttServer = "maker.ifttt.com";
String eventName = "gas_alert";
String iftttKey = "TU_IFTTT_KEY";

void setup() {
  Serial.begin(9600);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  // Inicializar la pantalla LCD
  lcd.begin(20, 4);
  lcd.backlight();

  pinMode(gasSensorPin, INPUT);
  pinMode(resetButtonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(smokeSensorPin, INPUT);

  dht.begin();
  attachInterrupt(digitalPinToInterrupt(resetButtonPin), resetSystem, FALLING);
}

void loop() {
  int gasValue = analogRead(gasSensorPin);
  float tempValue = dht.readTemperature();
  int smokeValue = analogRead(smokeSensorPin);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas: ");
  lcd.print(gasValue);
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(tempValue);
  lcd.setCursor(0, 2);
  lcd.print("Smoke: ");
  lcd.print(smokeValue);

  if (gasValue > gasThreshold || tempValue > tempThreshold || smokeValue > smokeThreshold) {
    if (gasValue > gasThreshold) {
      Serial.println("Gas detected!");
      digitalWrite(redLedPin, HIGH);
      digitalWrite(yellowLedPin, LOW);
      digitalWrite(greenLedPin, LOW);
    }
    if (tempValue > tempThreshold) {
      Serial.println("High temperature detected!");
      digitalWrite(yellowLedPin, HIGH);
      digitalWrite(redLedPin, LOW);
      digitalWrite(greenLedPin, LOW);
    }
    if (smokeValue > smokeThreshold) {
      Serial.println("Smoke detected!");
      digitalWrite(redLedPin, HIGH);
      digitalWrite(greenLedPin, LOW);
      digitalWrite(yellowLedPin, LOW);
    }
    tone(buzzerPin, 1000); // tono de 1kHz
    sendNotification(gasValue, tempValue, smokeValue);
  } else {
    digitalWrite(redLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    noTone(buzzerPin);
    Serial.println("Safe levels.");
  }

  delay(1000); // Leer sensores cada segundo
}

void resetSystem() {
  noTone(buzzerPin);
  digitalWrite(greenLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(redLedPin, LOW);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("System Reset");
  delay(1000);
}

void sendNotification(int gasValue, float tempValue, int smokeValue) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = "http://" + String(iftttServer) + "/trigger/" + eventName + "/with/key/" + iftttKey + "?value1=" + String(gasValue) + "&value2=" + String(tempValue) + "&value3=" + String(smokeValue);
    http.begin(url);
    int httpCode = http.GET();
    http.end();
  }
}