#include <WiFi.h>

#include <Servo.h>



Servo myservo;  // create servo object to control a servo

// twelve servo objects can be created on most boards



// GPIO the servo is attached to

static const int servoPin = 13;



// Replace with your network credentials

const char* ssid     = "Danielevan";

const char* password = "12345678";



// Set web server port number to 80

WiFiServer server(80);



// Variable to store the HTTP request

String header;



// Decode HTTP GET value

String valueString = String(5);

int pos1 = 0;

int pos2 = 0;



// Current time

unsigned long currentTime = millis();

// Previous time

unsigned long previousTime = 0; 

// Define timeout time in milliseconds (example: 2000ms = 2s)

const long timeoutTime = 2000;



void setup() {

  Serial.begin(115200);



  myservo.attach(servoPin);  // attaches the servo on the servoPin to the servo object



  // Connect to Wi-Fi network with SSID and password

  Serial.print("Connecting to ");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  // Print local IP address and start web server

  Serial.println("");

  Serial.println("WiFi connected.");

  Serial.println("IP address: ");

  Serial.println(WiFi.localIP());

  server.begin();

}



void loop(){

  WiFiClient client = server.available();   // Listen for incoming clients



  if (client) {                             // If a new client connects,

    currentTime = millis();

    previousTime = currentTime;

    Serial.println("New Client.");          // print a message out in the serial port

    String currentLine = "";                // make a String to hold incoming data from the client

    while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected

      currentTime = millis();

      if (client.available()) {             // if there's bytes to read from the client,

        char c = client.read();             // read a byte, then

        Serial.write(c);                    // print it out the serial monitor

        header += c;

        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.

          // that's the end of the client HTTP request, so send a response:

          if (currentLine.length() == 0) {

            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)

            // and a content-type so the client knows what's coming, then a blank line:

            client.println("HTTP/1.1 200 OK");

            client.println("Content-type:text/html");

            client.println("Connection: close");

            client.println();



            // Display the HTML web page

            client.println("<!DOCTYPE html><html>");

            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");

            client.println("<link rel=\"icon\" href=\"data:,\">");

            // CSS to style the on/off buttons 

            // Feel free to change the background-color and font-size attributes to fit your preferences

            client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\", Arial; margin-left:auto; margin-right:auto;}");

            client.println(".slider { width: 300px; }</style>");

            client.println("<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\"></script>");

                     

            // Web Page

            client.println("</head><body><h1>ESP32 with Servo</h1>");

            client.println("<p>Position: <span id=\"servoPos\"></span></p>");          

            client.println("<input type=\"range\" min=\"0\" max=\"180\" class=\"slider\" id=\"servoSlider\" onchange=\"servo(this.value)\" value=\""+valueString+"\"/>");

            

            client.println("<script>var slider = document.getElementById(\"servoSlider\");");

            client.println("var servoP = document.getElementById(\"servoPos\"); servoP.innerHTML = slider.value;");

            client.println("slider.oninput = function() { slider.value = this.value; servoP.innerHTML = this.value; }");

            client.println("$.ajaxSetup({timeout:1000}); function servo(pos) { ");

            client.println("$.get(\"/?value=\" + pos + \"&\"); {Connection: close};}</script>");

           

            client.println("</body></html>");     

            

            //GET /?value=180& HTTP/1.1

            if(header.indexOf("GET /?value=")>=0) {

              pos1 = header.indexOf('=');

              pos2 = header.indexOf('&');

              valueString = header.substring(pos1+1, pos2);

              

              //Rotate the servo

              myservo.write(valueString.toInt());

              Serial.println(valueString); 

            }         

            // The HTTP response ends with another blank line

            client.println();

            // Break out of the while loop

            break;

          } else { // if you got a newline, then clear currentLine

            currentLine = "";

          }

        } else if (c != '\r') {  // if you got anything else but a carriage return character,

          currentLine += c;      // add it to the end of the currentLine

        }

      }

    }

    // Clear the header variable

    header = "";

    // Close the connection

    client.stop();

    Serial.println("Client disconnected.");

    Serial.println("");

  }

}