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

#define DHT_PIN 12 
#define TDS_PIN 35
#define PH_PIN 21

#define MQTT_SERVER "broker.emqx.io"
#define MQTT_PORT 1883

const char *ssid = "Wokwi-GUEST";
const char *password = "";

#define MQTT_TOPIC_PH "phValue"
#define MQTT_TOPIC_TDS "tdsValue"
#define MQTT_TOPIC_TEMP "tempValue"
#define MQTT_TOPIC_HUM "humValue"

WiFiClient espClient;
PubSubClient client(espClient);

DHT dht(DHT_PIN, DHT22);

void setup() {
  Wire.begin(23, 22);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  connectToWiFi();
  
  client.setServer(MQTT_SERVER, MQTT_PORT);
  client.setCallback(callback);

  dht.begin();
}

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

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();  // Read temperature from DHT sensor
  
  //Read alnalog value from ADC converter
   int16_t tdsValue = analogRead(TDS_PIN);
   //Find voltage at the pin
   float voltage = tdsValue * (5 / 4095.0);
   //Find actual value as sensor's max voltage is 2.3
   int mappedTdsValue = (voltage / 2.3) * 1000;

  //ph
  int16_t phValue = analogRead(PH_PIN);
   

   Serial.print("TDS: ");
   Serial.print(mappedTdsValue);
   Serial.print(" Voltage: ");
   Serial.print(voltage);
   Serial.print(" Temp: ");
   Serial.print(temperature);
   Serial.print(" Humidity: ");
   Serial.print(humidity);
   Serial.print(" ph: ");
   Serial.println(phValue);

   delay(5000);
   // put your main code here, to run repeatedly:

   client.publish(MQTT_TOPIC_PH, String(7).c_str());
   client.publish(MQTT_TOPIC_TDS, String(mappedTdsValue).c_str());
   client.publish(MQTT_TOPIC_TEMP, String(temperature).c_str());
   client.publish(MQTT_TOPIC_HUM, String(humidity).c_str());

   Serial.print("Sent mtqq data");
   delay(10); // this speeds up the simulation
}

void connectToWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("esp32_neopixel_controller")) {
      Serial.println("Connected to MQTT");
      // subscribeToCommands();
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}

void callback(char *topic, byte *payload, unsigned int length) {
  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.print("Payload: ");
  Serial.print("Command Received: ");
  Serial.println(message);
  // Check the received MQTT topic
  if (strcmp(topic, "MQTT_TOPIC_SPEED") == 0) {
    if (message.equals("0")) {
      // Set the motor speed based on the received command
      int speedCommand = message.toInt();
    }     
  }
  else if (strcmp(topic," MQTT_TOPIC_LIGHT") == 0) {
    if (message.equals("off")) {
      Serial.println("Neopixel turned OFF");
    } 
  }
 
}