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

int c=0;
int p=0;
#define SEN1 33
#define SEN2 25

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);
unsigned long lastMsg = 0;

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

  WiFi.mode(WIFI_STA); 
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) { 
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) { 
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) { 
    Serial.print((char)payload[i]);
  }}
void reconnect() { 
  while (!client.connected()) {
    Serial.print("\nAttempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("IOT_Phase 4", "Welcome");
      client.subscribe("Public Transport"); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(100);
    }}
}

void setup() {
  Serial.begin(115200);
  pinMode(SEN1, INPUT_PULLUP);
  pinMode(SEN2, INPUT_PULLUP);
  setup_wifi(); 
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback); 
}

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

  int S1 = digitalRead(SEN1);
  int S2 = digitalRead(SEN2);

  if (S1 == LOW) {
    Serial.println("\n\n=========================");
    Serial.println("A passenger stepped in");
    c=c+1;
    p=p+1;
    String crt = String(c, 2);
    client.publish("Curent/Count", crt.c_str()); // publish temp topic /ThinkIOT/temp
    String tot = String(p, 1); 
    client.publish("Total/Count", tot.c_str());   // publish hum topic /ThinkIOT/hum
    Serial.print("Current Passenger count:\t");
    Serial.println(c);
    Serial.print("Total passenger Count:\t");
    Serial.println(p);
    delay(100);
  }
  
  if (S2 == LOW) {
    Serial.println("\n\n=========================");
    Serial.println("A passenger stepped out");
    c=c-1;
    if (c<=0){
      c=0;
    }
    String crt = String(c, 2);
    client.publish("Curent/Count", crt.c_str()); // publish temp topic /ThinkIOT/temp
    String tot = String(p, 1); 
    client.publish("Total/Count", tot.c_str());   // publish hum topic /ThinkIOT/hum
    Serial.print("Current Passenger count:\t");
    Serial.println(c);
    Serial.print("Total passenger Count:\t");
    Serial.print(p);
    delay(100);
  }
}