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

// Wi-Fi (na simulação Wokwi usar “Wokwi-GUEST”)
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT Broker HiveMQ público
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* mqtt_client_id = "esp32_dht22_gauge_graph";

WiFiClient espClient;
PubSubClient client(espClient);

// Pinos e tipos
#define DHTPIN       4
#define DHTTYPE      DHT22
#define RELAY1_PIN   25
#define RELAY2_PIN   26

// Thresholds para relés
#define TEMP_THRESHOLD_HIGH 30.0
#define HUM_THRESHOLD_LOW    40.0

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

void setup_wifi() {
  delay(100);
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");
    if (client.connect(mqtt_client_id)) {
      Serial.println("MQTT connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);

  pinMode(RELAY1_PIN, OUTPUT);
  pinMode(RELAY2_PIN, OUTPUT);
  digitalWrite(RELAY1_PIN, LOW);
  digitalWrite(RELAY2_PIN, LOW);

  Wire.begin(17, 16);  // SDA=17, SCL=16
  lcd.init();
  lcd.backlight();

  dht.begin();

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  delay(2000);

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  if (isnan(temp) || isnan(hum)) {
    Serial.println("Erro ao ler DHT22");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Erro leitura");
    return;
  }

  // Publica temperatura e umidade no MQTT
  char tempStr[10];
  dtostrf(temp, 4, 1, tempStr);
  client.publish("esp32/temper", tempStr);

  char humStr[10];
  dtostrf(hum, 4, 1, humStr);
  client.publish("esp32/umida", humStr);

  // Atualiza LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp, 1);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Umid: ");
  lcd.print(hum, 1);
  lcd.print(" %");

  // Aciona relés conforme thresholds
  digitalWrite(RELAY1_PIN, temp > TEMP_THRESHOLD_HIGH ? HIGH : LOW);
  digitalWrite(RELAY2_PIN, hum < HUM_THRESHOLD_LOW ? HIGH : LOW);
}