#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"

// ===== CONFIGURAÇÃO WI-FI =====
const char* ssid = "FIAP-IOT";
const char* password = "[email protected]";

// ===== CONFIGURAÇÃO MQTT =====
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* topicTemp = "planta/temperatura";
const char* topicHum = "planta/umidade";
const char* topicLuz = "planta/luminosidade";

// ===== PINOS =====
#define DHT_PIN 15
#define LDR_PIN 34
#define LED_PIN 2

DHTesp dht;
WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  Serial.print("Conectando ao Wi-Fi ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConectado!");
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Tentando conectar ao MQTT...");
    if (client.connect("ESP32_PLANTA")) {
      Serial.println("Conectado!");
    } else {
      Serial.print("Falha, rc=");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);

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

  dht.setup(DHT_PIN, DHTesp::DHT22);
  Serial.println("Sensor DHT22 inicializado!");
}

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

  TempAndHumidity data = dht.getTempAndHumidity();

  if (isnan(data.temperature) || isnan(data.humidity)) {
    Serial.println("Falha ao ler do DHT22!");
    delay(2000);
    return;
  }

  // ===== LDR =====
  int ldrValor = analogRead(LDR_PIN);   // 0–4095
  int luzPct = map(ldrValor, 0, 4095, 0, 100);
  luzPct = 100 - luzPct; // inverter: 100 = claro, 0 = escuro

  digitalWrite(LED_PIN, luzPct < 30 ? HIGH : LOW);

  // ===== Publicar MQTT =====
  char msgTemp[10];
  char msgHum[10];
  char msgLuz[10];
  sprintf(msgTemp, "%.1f", data.temperature);
  sprintf(msgHum, "%.1f", data.humidity);
  sprintf(msgLuz, "%d", luzPct);

  client.publish(topicTemp, msgTemp);
  client.publish(topicHum, msgHum);
  client.publish(topicLuz, msgLuz);

  Serial.printf("Temperatura: %.1f°C | Umidade: %.1f%% | Luz: %d%%\n",
                data.temperature, data.humidity, luzPct);

  delay(3000);
}