// This is NOT works!
// may try to use esp32 as original video.
// https://youtu.be/lEXQ9w1z7Aw?si=S_FU0z0PoN6px3gk

#include <Adafruit_Sensor.h>
#include <DHT_U.h>
#include <WiFi.h>
#include <PubSubClient.h>
//#include <Servo.h>
#include <ESP32Servo.h> // Include the Servo library
#include <FastLED.h>

// Defining Pins
#define DHTPIN 2
#define LED 10
#define SERVO_PIN 5 // Servo Motor pin
#define LED_PIN 4   // WS2812 LED strip pin
#define NUM_LEDS 16 // # of LEDS in the strip

// DHT parameters
#define DHTTYPE DHT22 // DHT 11
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;

// Servo motor
Servo servo;

// WS2812 LED strip
CRGB leds[NUM_LEDS];

// Wifi
const char* ssid = "Wokwi-GUEST"; // Setting your AP SSID
const char* password = "";        // Setting your AP PSK

// Define MQTT parameters
const char* mqttServer = "broker.hivemq.com";
const char* topic = "Tempdata";   // Publish topic
const char* clientID = "ESP32-wokwi";

// Parameters for using non-blocking delay
unsigned long previousMillis = 0;
const long interval = 1000;

String msgStr = "";   // MQTT message buffer
float temp, hum;

// Setting up Wifi and MQTT client
WiFiClient espClient;
PubSubClient client(espClient);

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

void reconnect() {
  while (!client.connected()) {
    if (client.connect(clientID)) {
      Serial.println("MQTT connected");
      client.subscribe("lights");
      client.subscribe("servo");  // Subscribe to servo topic
      client.subscribe("lights/neopixel");  // Subscribe to neopixel topic
      Serial.println("Topic Subscribed");
    } else {
      Serial.print("failed, rc = ");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);  // wait 5 secs and retry.
    }
  }
}

// Subscribe callback
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String data = "";
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
    data += (char)payload[i];
  }
  Serial.println();
  Serial.print("Message size: ");
  Serial.println(length);
  Serial.println();
  Serial.println("------------------------");
  Serial.println(data);

  if (String(topic) == "lights") {
    if (data == "ON") {
      Serial.println("LED");
      digitalWrite(LED, HIGH);
    } else {
      digitalWrite(LED, LOW);
    }
  } else if (String(topic) == "servo") {
    int degree = data.toInt();  // Convert the received data to an integer
    Serial.print("Moving servo to degree: ");
    Serial.println(degree);
    servo.write(degree);  // Move the servo to the specified degree
  } else if (String(topic) == "lights/neopixel") {
    int red, green, blue;
    sscanf(data.c_str(), "%d,%d,%d", &red, &green, &blue);  // Parse the received ??
    Serial.print("Setting NeoPixel color to (R,G,B): ");
    Serial.print(red);
    Serial.print(",");
    Serial.print(green);
    Serial.print(",");
    Serial.println(blue);
    fill_solid(leds, NUM_LEDS, CRGB(red, green, blue));   // Set all LeDs in the s??
    FastLED.show();   // Update the LED strip with the new color
    fill_solid(leds, NUM_LEDS, CRGB(red, green, blue));   // ?? why do we need 2 times?
    FastLED.show();
  }
}

void setup() {
  Serial.begin(115200);
  // Initialize device.
  dht.begin();
  // Get temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);

  // Setup servo.
  servo.attach(SERVO_PIN);
  servo.write(0);

  // Setup WS2812 LED strip.
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

  setup_wifi();
  client.setServer(mqttServer, 1833);   // Setting MQTT server
  client.setCallback(callback);   // Define function which will be called when a m??
}

void loop() {
  if (!client.connected()) {    // If client is not connected.
    reconnect();    // Try to reconnect.
  }
  client.loop();
  unsigned long currentMillis = millis();   // Read current time.
  if (currentMillis - previousMillis >= interval) {   // If current time - last time??
    previousMillis = currentMillis;
    // Read temperature and humidity.
    sensors_event_t event;
    dht.temperature().getEvent(&event);
    if (isnan(event.temperature)) {
      Serial.println(F("Error reading temperature!"));
    } else {
      Serial.print(F("Temperature: "));
      temp = event.temperature;
      Serial.print(temp);
      Serial.println(F("°C"));
    }
    // Get humidity event and print its value.
    dht.humidity().getEvent(&event);
    if (isnan(event.relative_humidity)) {
      Serial.println(F("Error reading humidity!"));
    } else {
      Serial.print(F("Humidity: "));
      hum = event.relative_humidity;
      Serial.print(hum);
      Serial.println(F("%"));
    }
    msgStr = String(temp) + "," + String(hum) + ",";
    byte arrSize = msgStr.length() + 1;
    char msg[arrSize];
    Serial.print("PUBLISH DATA: ");
    Serial.println(msgStr);
    msgStr.toCharArray(msg, arrSize);
    client.publish(topic, msg);
    msgStr = "";
    delay(1);
  }


}

/*
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-C3!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}
*/