/*
  Project : ESP32 MQTT Led - Publish

  Jangan Lupa rubah Sub topic (esp32-arf/led1) sesuai SUb Topic masing2

  App : 
  - MQTTdashboard 
  - IoT MQTT Panel ( test work in 2026 )

  Setting app IoT MQTT Panel :
  https://www.youtube.com/watch?v=jEaRXHiDUzQ 

  pada diagram.json gunakan ESP32 dengan type:wokwi-esp32-devkit-v1 agar sesuai dengan ESP32 yang ada dipasaran
  
  By : Arif S
  at : 2 Feb 2026

  - Non-blocking delay
  - add Publish           // Pulish test in LED 1


*/

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

// Non Blocking Delay
unsigned long previousMillis = 0;
const long interval = 3000; // interval at which to blink (milliseconds)
boolean flagF = true;

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

// MQTT
const char* mqtt_server = "broker.mqttdashboard.com";
const char* SUBTOPIC_LED1 = "esp32-ngin/led1";                       // arf sesuaikan chanel masing2
const char* SUBTOPIC_LED2 = "esp32-ngin/led2";                       // arf sesuaikan chanel masing2
const char* SUBTOPIC_LED3 = "esp32-ngin/led3";                       // arf sesuaikan chanel masing2
const char* SUBTOPIC_LED4 = "esp32-ngin/led4";                       // arf sesuaikan chanel masing2
WiFiClient espClient;
PubSubClient client(espClient);

// LED
const int LED1_PIN = 13;
const int LED2_PIN = 12;
const int LED3_PIN = 14;
const int LED4_PIN = 27;

// BUTTON (sesuai dengan diagram.json yang sudah ada)
const int BUTTON1_PIN = 21;  // btn1 -> D21 -> LED1 (merah)
const int BUTTON2_PIN = 19;  // btn2 -> D19 -> LED2 (biru)
const int BUTTON3_PIN = 18;  // btn3 -> D18 -> LED3 (hijau)
const int BUTTON4_PIN = 5;   // btn4 -> D5  -> LED4 (ungu)

// Status LED
bool led1State = false;
bool led2State = false;
bool led3State = false;
bool led4State = false;

// Status tombol sebelumnya
bool button1Pressed = false;
bool button2Pressed = false;
bool button3Pressed = false;
bool button4Pressed = false;

void setup_wifi() {
  delay(10);
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  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());
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    String clientId = "esp32-clientId-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.subscribe(SUBTOPIC_LED1);
      client.subscribe(SUBTOPIC_LED2);
      client.subscribe(SUBTOPIC_LED3);
      client.subscribe(SUBTOPIC_LED4);
    } else {
      delay(5000);
    }
  }
}

void callback(char *topic, byte *payload, unsigned int length) {
  Serial.print("Receive Topic: ");
  Serial.println(topic);

  Serial.print("Payload: ");
  Serial.println((char *)payload);
  
  if (!strcmp(topic, SUBTOPIC_LED1)) {
    if (!strncmp((char *)payload, "1", length)) {
      digitalWrite(LED1_PIN, HIGH);
      led1State = true;
    } 
    else if (!strncmp((char *)payload, "0", length)) {
      digitalWrite(LED1_PIN, LOW);
      led1State = false;
    }
  } 
  if (!strcmp(topic, SUBTOPIC_LED2)) {
    if (!strncmp((char *)payload, "1", length)) {
      digitalWrite(LED2_PIN, HIGH);
      led2State = true;
    } 
    else if (!strncmp((char *)payload, "0", length)) {
      digitalWrite(LED2_PIN, LOW);
      led2State = false;
    }
  } 
  if (!strcmp(topic, SUBTOPIC_LED3)) {
    if (!strncmp((char *)payload, "1", length)) {
      digitalWrite(LED3_PIN, HIGH);
      led3State = true;
    } 
    else if (!strncmp((char *)payload, "0", length)) {
      digitalWrite(LED3_PIN, LOW);
      led3State = false;
    }
  } 
  if (!strcmp(topic, SUBTOPIC_LED4)) {
    if (!strncmp((char *)payload, "1", length)) {
      digitalWrite(LED4_PIN, HIGH);
      led4State = true;
    } 
    else if (!strncmp((char *)payload, "0", length)) {
      digitalWrite(LED4_PIN, LOW);
      led4State = false;
    }
  } 
}

void setup() {
  Serial.begin(115200);
  
  // Setup LED pins sebagai OUTPUT
  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);
  pinMode(LED3_PIN, OUTPUT);
  pinMode(LED4_PIN, OUTPUT);
  
  // Setup Button pins sebagai INPUT_PULLUP
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  pinMode(BUTTON4_PIN, INPUT_PULLUP);
  
  // Matikan semua LED di awal
  digitalWrite(LED1_PIN, LOW);
  digitalWrite(LED2_PIN, LOW);
  digitalWrite(LED3_PIN, LOW);
  digitalWrite(LED4_PIN, LOW);
  
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  unsigned long currentMillis = millis();
  
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  // Button 1
  if (digitalRead(BUTTON1_PIN) == LOW && !button1Pressed) {
    button1Pressed = true;
    led1State = !led1State;
    digitalWrite(LED1_PIN, led1State);
    if (client.connected()) {
      client.publish(SUBTOPIC_LED1, led1State ? "1" : "0");
    }
    Serial.println("Button 1 pressed - LED1: " + String(led1State ? "ON" : "OFF"));
  }
  if (digitalRead(BUTTON1_PIN) == HIGH) {
    button1Pressed = false;
  }
  
  // Button 2
  if (digitalRead(BUTTON2_PIN) == LOW && !button2Pressed) {
    button2Pressed = true;
    led2State = !led2State;
    digitalWrite(LED2_PIN, led2State);
    if (client.connected()) {
      client.publish(SUBTOPIC_LED2, led2State ? "1" : "0");
    }
    Serial.println("Button 2 pressed - LED2: " + String(led2State ? "ON" : "OFF"));
  }
  if (digitalRead(BUTTON2_PIN) == HIGH) {
    button2Pressed = false;
  }
  
  // Button 3
  if (digitalRead(BUTTON3_PIN) == LOW && !button3Pressed) {
    button3Pressed = true;
    led3State = !led3State;
    digitalWrite(LED3_PIN, led3State);
    if (client.connected()) {
      client.publish(SUBTOPIC_LED3, led3State ? "1" : "0");
    }
    Serial.println("Button 3 pressed - LED3: " + String(led3State ? "ON" : "OFF"));
  }
  if (digitalRead(BUTTON3_PIN) == HIGH) {
    button3Pressed = false;
  }
  
  // Button 4
  if (digitalRead(BUTTON4_PIN) == LOW && !button4Pressed) {
    button4Pressed = true;
    led4State = !led4State;
    digitalWrite(LED4_PIN, led4State);
    if (client.connected()) {
      client.publish(SUBTOPIC_LED4, led4State ? "1" : "0");
    }
    Serial.println("Button 4 pressed - LED4: " + String(led4State ? "ON" : "OFF"));
  }
  if (digitalRead(BUTTON4_PIN) == HIGH) {
    button4Pressed = false;
  }

  delay(10); // Small delay untuk stabilitas
}