#include <WiFi.h>
#include <PubSubClient.h>
// #include <DHT.h>
#include "DFRobot_BME680_I2C.h"
#include <DFRobot_ENS160.h>
#include "Wire.h"


/*use an accurate altitude to calibrate sea level air pressure*/
#define CALIBRATE_PRESSURE

DFRobot_BME680_I2C bme(0x77);  //0x77 I2C address
DFRobot_ENS160_I2C ENS160(&Wire, /*I2CAddr*/ 0x53);
float seaLevel; 

// WiFi Credentials
const char* ssid = "309";
const char* password = "12345678";

// MQTT Broker details
// MQTT Broker details
const char* mqtt_server = "192.168.0.122";
const char* mqtt_user = "siot";
const char* mqtt_password = "dfrobot";
const int mqtt_port = 1883; // Or 8883 for TLS
const char* topic = "Enviro/air_quality";  // Replace with your desired topic

// DHT Sensor Setup
////#define DHTPIN 4     // Digital pin connected to the DHT sensor
//#define DHTTYPE DHT11   // DHT 11
// DHT dht(DHTPIN, DHTTYPE);

// Initialize WiFi and MQTT client
WiFiClient espClient;
PubSubClient client(espClient);

// Function to connect to WiFi
void setup_wifi() {
  delay(10);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

// Function to reconnect to MQTT broker
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  // dht.begin();
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
    uint8_t rslt = 1;
  
  while(!Serial);
  delay(1000);
  Serial.println();
  while(rslt != 0) {
    rslt = bme.begin();
    if(rslt != 0) {
      Serial.println("bme begin failure");
      delay(2000);
    }
  }
  Serial.println("bme begin successful");


  while( NO_ERR != ENS160.begin() ){
    Serial.println("ENS160 Communication with device failed, please check connection");
    delay(3000);
  }
  Serial.println("Begin ok!");

  ENS160.setPWRMode(ENS160_STANDARD_MODE);


  #ifdef CALIBRATE_PRESSURE
  bme.startConvert();
  delay(1000);
  bme.update();
  /*You can use an accurate altitude to calibrate sea level air pressure. 
   *And then use this calibrated sea level pressure as a reference to obtain the calibrated altitude.
   *In this case,525.0m is chendu accurate altitude.
   */
  seaLevel = bme.readSeaLevel(525.0);
  Serial.print("seaLevel :");
  Serial.println(seaLevel);
  #endif
}

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

/*
  // Read temperature and humidity
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
*/

  bme.startConvert();
  delay(1000);
  bme.update();
  Serial.println();
  Serial.print("temperature(C) :");
  Serial.println(bme.readTemperature() / 100, 2);
  Serial.print("pressure(Pa) :");
  Serial.println(bme.readPressure());
  Serial.print("humidity(%rh) :");
  Serial.println(bme.readHumidity() / 1000, 2);
  Serial.print("gas resistance(ohm) :");
  Serial.println(bme.readGasResistance());
  Serial.print("altitude(m) :");
  Serial.println(bme.readAltitude());
  // #ifdef CALIBRATE_PRESSURE
  Serial.print("calibrated altitude(m) :");
  Serial.println(bme.readCalibratedAltitude(seaLevel));


  float t = bme.readTemperature() / 100;
  float p = bme.readPressure();
  float h = bme.readHumidity() / 1000;
  float alt = bme.readCalibratedAltitude(seaLevel);
  float g = bme.readGasResistance();
  

  // Create JSON payload  temperature
  String payload = "{";
  payload += "\"temperature\":";
  payload += String(t );
  payload += "C}";

  Serial.print("Publishing message: ");
  Serial.println(payload);

  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds



  // Create JSON payload  Pressure
  payload = "{";
  payload += "\"Pressure\":";
  payload += String(p );
  payload += "Pa}";

  Serial.print("Publishing message: ");
  Serial.println(payload);

  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds


  // Create JSON payload  Humidity
  payload = "{";
  payload += "\"Humidity\":";
  payload += String(h );
  payload += "%rh}";

  Serial.print("Publishing message: ");
  Serial.println(payload);
  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds

  // Create JSON payload  Gas resistance
  payload = "{";
  payload += "\"GasResistance\":";
  payload += String(g);
  payload += "ohm}";

  Serial.print("Publishing message: ");
  Serial.println(payload);
  
  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds

  // Create JSON payload  CalibratedAltitude
  payload = "{";
  payload += "\"CalibratedAltitude\":";
  payload += String(alt );
  payload += "m}";

  Serial.print("Publishing message: ");
  Serial.println(payload);




  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds


// ENV160 sensor
/**
   * Get the sensor operating status
   * Return value: 0-Normal operation, 
   *         1-Warm-Up phase, first 3 minutes after power-on.
   *         2-Initial Start-Up phase, first full hour of operation after initial power-on. Only once in the sensor’s lifetime.
   * note: Note that the status will only be stored in the non-volatile memory after an initial 24h of continuous
   *       operation. If unpowered before conclusion of said period, the ENS160 will resume "Initial Start-up" mode
   *       after re-powering.
   */
  uint8_t Status = ENS160.getENS160Status();
  Serial.print("Sensor operating status : ");
  Serial.println(Status);

  /**
   * Get the air quality index
   * Return value: 1-Excellent, 2-Good, 3-Moderate, 4-Poor, 5-Unhealthy
   */
  uint8_t AQI = ENS160.getAQI();
  Serial.print("Air quality index : ");
  Serial.println(AQI);

  /**
   * Get TVOC concentration
   * Return value range: 0–65000, unit: ppb
   */
  uint16_t TVOC = ENS160.getTVOC();
  Serial.print("Concentration of total volatile organic compounds : ");
  Serial.print(TVOC);
  Serial.println(" ppb");

  /**
   * Get CO2 equivalent concentration calculated according to the detected data of VOCs and hydrogen (eCO2 – Equivalent CO2)
   * Return value range: 400–65000, unit: ppm
   * Five levels: Excellent(400 - 600), Good(600 - 800), Moderate(800 - 1000), 
   *               Poor(1000 - 1500), Unhealthy(> 1500)
   */
  uint16_t ECO2 = ENS160.getECO2();
  Serial.print("Carbon dioxide equivalent concentration : ");
  Serial.print(ECO2);
  Serial.println(" ppm");

  Serial.println();
  delay(1000);


    // AQI Create JSON payload  Pressure
  payload = "{";
  payload += "\"AQI\":";
  payload += String(AQI);
  payload += "}";

  Serial.print("Publishing message: ");
  Serial.println(payload);

  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds

    // TVOC Create JSON payload  Pressure
  payload = "{";
  payload += "\"TVOC\":";
  payload += String(TVOC);
  payload += "ppb}";

  Serial.print("Publishing message: ");
  Serial.println(payload);

  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds


    // ECO2 Create JSON payload  Pressure
  payload = "{";
  payload += "\"ECO2\":";
  payload += String(ECO2);
  payload += "ppm}";

  Serial.print("Publishing message: ");
  Serial.println(payload);

  client.publish(topic, payload.c_str());
  delay(5000); // Publish every 5 seconds


}