#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

//***************** MQTT *****************************************************
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* hostname = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "jardim1"; //Esse ID deverá ser unico
int PORTNUM = 1883;

#define ledPin 2   // LED do ESP32

void setup_wifi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Conectado a rede SSID: ");
  Serial.println(ssid);
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void MQTTSubscribe() {
  client.subscribe("medonho");
}

void callback(char* topic, byte* payload, unsigned int length) {
  String messageTemp = "";

  for (int i = 0; i < length; i++) {
    messageTemp += (char)payload[i];
  }

  Serial.print("Mensagem recebida em ");
  Serial.println(topic);

  if (String(topic) == "medonho") {
    if (messageTemp == "off") {
      digitalWrite(ledPin, LOW);
      Serial.println("LED OFF");
    } else if (messageTemp == "on") {
      digitalWrite(ledPin, HIGH);
      Serial.println("LED ON");
    }
  }
}

void connectMQTT() {
  while (!client.connected()) {
    Serial.println("Conectando ao MQTT...");
    if (client.connect(espClientName)) {
      Serial.println("Conectado ao Broker!");
      MQTTSubscribe();
    } else {
      Serial.print("Falha, estado: ");
      Serial.println(client.state());
      delay(2000);
    }
  }
}

void setup_MQTT() {
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback);
}

//***************************************************************************
// Display I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pinos
#define sensorDeUmidade 34
#define buzina 25
#define BtnMais 18
#define BtnMenos 19

// Variáveis
int limiteDeUmidade = 30;
int valorDoSensorDeUmidade = 0;
int umidadeDe_0a100 = 0;

unsigned long previousMillis = 0;
unsigned long interval = 2000;

void setup() {
  Serial.begin(9600);

  pinMode(buzina, OUTPUT);
  pinMode(BtnMais, INPUT_PULLUP);
  pinMode(BtnMenos, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);

  Wire.begin(21, 22);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Monitor Medonho");
  lcd.setCursor(0, 1);
  lcd.print("para Jardim");
  delay(3000);
  lcd.clear();

  setup_wifi();
  setup_MQTT();
}

void loop() {

  if (!client.connected()) {
    connectMQTT();
  }
  client.loop();

  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    int pot = analogRead(36);   // A0 do ESP32 = GPIO36
    String potString = String(pot);
    client.publish("medonho", potString.c_str());

    Serial.print("Enviado: ");
    Serial.println(potString);
  }
}