// code for controlling servo motor using nodered dashboard
#include <WiFi.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>

// Defining Pins
#define LED_young 2
#define LED_middel 23
#define LED_elderly 4

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "mqtt-dashboard.com";// MQTT broker

LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 16 column and 2 rows
 
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

int num_young = 0;
int num_middle = 0;
int num_old = 0;

void setup() {
  Serial.begin(115200);
  setup_wifi();
  lcd.init(); // initialize the lcd
  lcd.backlight();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  pinMode(LED_young, OUTPUT);
  pinMode(LED_middel, OUTPUT);
  pinMode(LED_elderly, OUTPUT);
  //digitalWrite(3, HIGH);
}
void setup_wifi() {
  delay(10);
  Serial.println();
  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.println("IP address: ");
  Serial.println(WiFi.localIP());
}
  // ตรวจสอบค่า "a" ในอ็อบเจ็กต์
  // const char* y_value = doc["y"];

// 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) == "esp32mqtt2") {
    if (data == "young") {
      num_young = num_young+1;
      lcd.clear();
      digitalWrite(LED_young, HIGH);
      digitalWrite(LED_middel, LOW);
      digitalWrite(LED_elderly, LOW);
      lcd.setCursor(0, 0);      // move cursor to   (0, 0)
      lcd.print("Young");       // print message at (0, 0)
      lcd.setCursor(15, 0);
      lcd.print(num_young);

      lcd.setCursor(0, 1);      // move cursor to   (0, 0)
      lcd.print("Middle aged");       // print message at (0, 0)
      lcd.setCursor(15, 1);
      lcd.print(num_middle);

      lcd.setCursor(0, 2);      // move cursor to   (0, 0)
      lcd.print("Elderly");       // print message at (0, 0)
      lcd.setCursor(15, 2);
      lcd.print(num_old);

  delay(2000);   
    }
    else if(data == "middle_aged") {
      num_middle = num_middle+1;
      lcd.clear();
      digitalWrite(LED_middel, HIGH);
      digitalWrite(LED_young, LOW);
      digitalWrite(LED_elderly, LOW);
      lcd.setCursor(0, 0);      // move cursor to   (0, 0)
      lcd.print("Young");       // print message at (0, 0)
      lcd.setCursor(15, 0);
      lcd.print(num_young);

      lcd.setCursor(0, 1);      // move cursor to   (0, 0)
      lcd.print("Middle aged");       // print message at (0, 0)
      lcd.setCursor(15, 1);
      lcd.print(num_middle);

      lcd.setCursor(0, 2);      // move cursor to   (0, 0)
      lcd.print("Elderly");       // print message at (0, 0)
      lcd.setCursor(15, 2);
      lcd.print(num_old);
    }
    else if(data == "elderly") {
      num_old = num_old+1;
      lcd.clear();
      digitalWrite(LED_elderly, HIGH);
      digitalWrite(LED_young, LOW);
      digitalWrite(LED_middel, LOW);
      lcd.setCursor(0, 0);      // move cursor to   (0, 0)
      lcd.print("Young");       // print message at (0, 0)
      lcd.setCursor(15, 0);
      lcd.print(num_young);

      lcd.setCursor(0, 1);      // move cursor to   (0, 0)
      lcd.print("Middle aged");       // print message at (0, 0)
      lcd.setCursor(15, 1);
      lcd.print(num_middle);

      lcd.setCursor(0, 2);      // move cursor to   (0, 0)
      lcd.print("Elderly");       // print message at (0, 0)
      lcd.setCursor(15, 2);
      lcd.print(num_old);
    }
    else{
      digitalWrite(LED_young, LOW);
      digitalWrite(LED_middel, LOW);
      digitalWrite(LED_elderly, LOW);
    }

  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESPClient")) {
      Serial.println("connected");
      client.subscribe("esp32mqtt2");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds"); 
      delay(5000);
   }}}
void loop() {

digitalWrite(3, HIGH);

  if (!client.connected()) {
    reconnect();
  }
  client.loop(); 
 delay(100);
 
}