#include "DHT.h"
#include <LiquidCrystal_I2C.h>

#define DHTPIN 2      // DHT22 conectado al pin 2
#define DHTTYPE DHT22  // Tipo de sensor
#define LED_PIN 4     // LED en pin 4 (imitación de "ventana abierta")
#define GAS_SENSOR_PIN 14
#define GAS_ANALOG_PIN 34
#define LED_GAS 15
#define RAIN_PIN 32
#define LED_RAIN 5
#define WINDOW_SENSOR_PIN 27

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Iniciando...");

  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW); // ventana cerrada
  pinMode(GAS_SENSOR_PIN, INPUT);
  pinMode(GAS_ANALOG_PIN, INPUT);
  pinMode(LED_GAS, OUTPUT);
  digitalWrite(LED_GAS, LOW);
  pinMode(LED_RAIN, OUTPUT);
  digitalWrite(LED_RAIN, LOW);
  pinMode(WINDOW_SENSOR_PIN, INPUT_PULLUP);

  dht.begin();

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("Sistema IoT");
  lcd.setCursor(0,1);
  lcd.print("Iniciando...");
  delay(1000);
  lcd.clear();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation

  float temp = dht.readTemperature();

  // int GAS_SENSOR = digitalRead(GAS_SENSOR_PIN);
  int GAS_ANALOG =analogRead(GAS_ANALOG_PIN);

  int RAIN = analogRead(RAIN_PIN);

  int windowState = digitalRead(WINDOW_SENSOR_PIN); 
// 0 = switch ON, 1 = switch OFF

  // Verificación de lectura válida
  if (isnan(temp)) {
    lcd.setCursor(0,0);
    lcd.print("Error DHT22");
    return;
  }

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print("C");

  if (temp > 25.0) {
    if (windowState == 1) {
      digitalWrite(LED_PIN, HIGH);  // LED encendido = ventana abierta
    }
    lcd.setCursor(0,1);
    lcd.print("Ventana: ABRIR");

    if(windowState == 1){
      lcd.setCursor(0, 1);
      lcd.print("ERROR: ventana no abre!");
    }
  } else {
    if(windowState == 0){
      digitalWrite(LED_PIN, LOW);
    }
    lcd.setCursor(0,1);
    lcd.print("Ventana: CERRAR");

    if(windowState == 0){
      lcd.setCursor(0, 1);
      lcd.print("ERROR: ventana no cierra!");
    }
  }

  delay(2500);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("GAS: ");
  lcd.print(GAS_ANALOG); 

  if(GAS_ANALOG > 1500){
    digitalWrite(LED_GAS, HIGH);
    lcd.setCursor(0,1);
    lcd.print("ATTENCION! GAS!");
  } else {
    digitalWrite(LED_GAS, LOW);
    lcd.setCursor(0,1);
    lcd.print("Gas Normal");
  }

  delay(3000);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("RAIN: ");
  lcd.print(RAIN); 

  if(RAIN > 1000){
    digitalWrite(LED_RAIN, HIGH);
    lcd.setCursor(0,1);
    lcd.print("ESTA LLOVIENDO: CERRAR");
  } else {
    digitalWrite(LED_RAIN, LOW);
  }

  delay(1500);
}