#include <Arduino.h>
#include <ArduinoJson.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "time.h"

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

#define DATABASE_URL "https://upcpre202401si572ws71iotstatus-default-rtdb.firebaseio.com/.json"

HTTPClient client;

#define MQ2_ANALOG 36
#define MQ2_DIGITAL 18

LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
  pinMode(MQ2_ANALOG, INPUT);
  pinMode(MQ2_DIGITAL, INPUT);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting to ");
  lcd.setCursor(0, 1);
  lcd.print("WiFi ");
  
  // WiFi Setup
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  } 
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.println("Online");
  delay(500);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.println("Connecting to");
  lcd.setCursor(0, 1);
  lcd.println("Firebase...");

  client.begin(DATABASE_URL);
  int httpResponseCode = client.GET();

  if (httpResponseCode > 0) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.println("Connected");
  }
  delay(1000);
  configTime(-9000, -9000, "1.south-america.pool.ntp.org");

  lcd.clear();
}

void loop() {
  Serial.print("Analog: ");
  int MQ2_ANALOG_X = analogRead(MQ2_ANALOG);
  int MQ2_ScaledValue = map(MQ2_ANALOG_X,0,4095,0,100);
  Serial.println(MQ2_ScaledValue);
  Serial.print("Digital :");
  Serial.println(digitalRead(MQ2_DIGITAL));
  delay(1000);

  lcd.setCursor(1,0);
  lcd.print("Detector de gases");

  lcd.setCursor(1,1);
  lcd.print("%Gas: ");
  lcd.print(MQ2_ScaledValue);
  lcd.println(" PPM      ");
  delay(5);
}