// This example appears to be working with Node Red.
// 2 Way connection via Node Red
// I can control the LED with the switch in Node Red and I get the temperature data from the ESP32.
// https://youtu.be/I52AKly-mSE?si=hhhn-SxADyRnvpy3
// 7:29PM 4/8/2024


// #include <WiFi.h>
// // #include <Adafruit_NeoPixel.h>
// #include <PubSubClient.h>
// // #include <DHTesp.h>

// // https://youtu.be/I52AKly-mSE?si=PDxByik9zV7zUeaC

// const int     DHT_PIN     = 26;
// DHTesp        dht;
// WiFiClient    espClient;
// PubSubClient  client(espClient);
// const char*   ssid        = "Wokwi-GUEST"; /// wifi ssid
// const char*   password    = "";
// const char*   mqtt_server = "test.mosquitto.org"; // mosquitto server url


/**************************************************
  Home automation code for ESP32 - Arduino IDE
  Connect LED + 330 ohm resistor to D2
  Connect Potentiometer wiper to D34, 3.3V and gnd
  Code for 1st ESP32
*************************************************/

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

#define NUM_LEDS  16
#define DATA_PIN  5
// #define CLOCK_PIN 13

#define BUTTON_PIN 13   // Define the pin connected to the button
#define PIXEL_PIN  5    // Define the pin connected to the NeoPixel LED strip
#define NUM_PIXELS 16   // Define the number of NeoPixels in your strip

// Define the array of leds
CRGB leds[NUM_LEDS];
String macAddressWithoutColon;


// Replace the next variables with your SSID/Password combination
const char*   ssid        = "Wokwi-GUEST"; /// wifi ssid
const char*   password    = "";
const char*   mqtt_server = "test.mosquitto.org"; // mosquitto server url

WiFiClient espClient;
PubSubClient client(espClient);// To connect more ESP32's change "client" to for instance "client2" here and in the rest of the code
long          lastMsg = 0;
char          msg[50];
int           value = 0;
float         temperature = 0;
// int i = 0;

// variables will change:
int           buttonState = 0;  // variable for reading the pushbutton status
int           lastButtonState = LOW;  // the previous reading from the input pin
// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers


// const int     ledPin      = 2;    //connect LED to GPIO pin 2
// const int     potmeterPin = 34;   //Connect Potentiometer to GPIO34
const int buttonPin = 14;  // the number of the pushbutton pin

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);  // GRB ordering is assumed
  // pinMode(ledPin, OUTPUT);//set ledPin to output
  pinMode(buttonPin, INPUT);
  //Potentiometer GPIO34: no Pinmode for Analog-inputs: The analogRead() function takes care of that :-)
}

void setup_wifi() {  // Connect to WiFi network
  delay(100);
  Serial.println();
  Serial.print("Connecting to Wifi");
  //Serial.println(ssid); //uncomment if you want to see your SSID in serial monitor
  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());
  Serial.println(WiFi.macAddress());
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // if (String(topic) == "esp32/output") {//Check if the MQTT message matches the subscription, if add more ESP32 change topic esp32 to for instance esp33
  //   Serial.print("Changing output to ");
  //   if (messageTemp == "true") { //if the message is "true", switch on
  //     Serial.println("on");
  //     digitalWrite(ledPin, HIGH);
  //   }
  //   else if (messageTemp == "false") { //if the message is "false", switch off
  //     Serial.println("off");
  //     digitalWrite(ledPin, LOW);
  //   }
  // }  // You can add more "if" statements behind this to control more GPIOs with MQTT
}

void reconnect() {
  while (!client.connected()) {   // Loop until connected to the MQTT server
    Serial.print("Trying MQTT connection...");
    if (client.connect("ESP32Client")) {     // Try to connect
      Serial.println("connected");
      client.subscribe("esp32/output");      // Subscribe to topic, if add more ESP32 change topic esp32 to for instance esp33
                                             // This value must match the topic in the switch config of Node Red.  (Receiver Side)
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);      // Wait 5 seconds before retrying
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
    // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == LOW) {
        leds[0] = CRGB::Red;
        FastLED.show();
        // client.publish("/button/LOW"); // Publish MQTT topic for button press
        client.publish("test", "This is a test message"); //SUBSCRIBE TO TOPIC /temp, pass the value as a string
        Serial.println("Button Pressed");
        delay(500);
      }
    }
  }

  // set the LED:
  // digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;

}



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