#include <WiFi.h>
#include <WebServer.h>

const char* ssid = "Galaxy F41F165";
const char* password = "hardikchadha";

WebServer server(80);

#define LED 2
#define PIR 4 

int motionCounter = 0; 

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  pinMode(PIR, INPUT);
  
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }
  
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  String page;
  server.on("/", [](){
    page = "<h1>PIR Sensor to NodeMCU</h1><h1>Motion Counter:</h1> <h1 id=\"counter\"></h1>\r\n";
    page += "<script>\r\n";
    page += "function updateCounter() {\r\n";
    page += "  var xhttp = new XMLHttpRequest();\r\n";
    page += "  xhttp.onreadystatechange = function() {\r\n";
    page += "    if (this.readyState == 4 && this.status == 200) {\r\n";
    page += "      document.getElementById(\"counter\").innerHTML = this.responseText;\r\n";
    page += "    }\r\n";
    page += "  };\r\n";
    page += "  xhttp.open(\"GET\", \"/counter\", true);\r\n";
    page += "  xhttp.send();\r\n";
    page += "}\r\n";
    page += "setInterval(updateCounter, 1000);\r\n"; 
    page += "</script>\r\n";
    server.send(200, "text/html", page);
  });

  server.on("/counter", [](){
    server.send(200, "text/plain", String(motionCounter));
  });

  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  server.handleClient();

  if (digitalRead(PIR) == HIGH) {
    motionCounter++; 
    delay(1000);
  }

  delay(10);
}