/* proyecto de plataforma con IA y sostenible */
#include <WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "DHT.h"

#define DHTPIN 15
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);

unsigned long lastMsg = 0;

// RECONEXIÓN MQTT
void reconnect() {
  while (!client.connected()) {
    Serial.println("Intentando conectar a MQTT...");
    if (client.connect("esp32-agricultura")) {
      Serial.println("Conectado a MQTT");
      client.subscribe("samaca/control");
    } else {
      Serial.println("Fallo MQTT, reintentando...");
      delay(2000);
    }
  }
}

// WIFI
void setupWiFi() {
  Serial.println("Conectando a WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi conectado");
}

// SETUP
void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("Iniciando ESP32...");

  setupWiFi();

  client.setServer(mqtt_server, 1883);
  dht.begin();

  Serial.println("Sistema listo.");
}

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

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;

    float temperatura = dht.readTemperature();
    float humedad = dht.readHumidity();

    if (isnan(temperatura) || isnan(humedad)) {
      Serial.println("Error leyendo DHT");
      return;
    }

    int luz = analogRead(34);
    int nivel = analogRead(35);

    StaticJsonDocument<256> doc;
    doc["temperatura"] = temperatura;
    doc["humedad"] = humedad;
    doc["luz"] = luz;
    doc["nivel"] = nivel;

    char jsonBuffer[256];
    serializeJson(doc, jsonBuffer);

    client.publish("samaca/datos", jsonBuffer);

    Serial.println(jsonBuffer);
  }
}