/*********

  Rui Santos

  Complete project details at http://randomnerdtutorials.com  

  Quentorres - XIAO ESP32-C3

*********/

// Load Wi-Fi library

#include <WiFi.h>

// Replace with your network credentials

const char* ssid = "REPLACE_WITH_YOUR_SSID";

const char* password = "REPLACE_WITH_YOUR_PASSWORD";

// Set web server port number to 80

WiFiServer server(80);

// Variable to store the HTTP request

String header;

// Auxiliar variables to store the current output state

String outputD6State = "off";

String outputD7State = "off";

String outputD0State = "off";

// Assign output variables to GPIO pins

const int outputD6 = D6;

const int outputD7 = D7;

const int outputD0 = D0;

// 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);

  // Initialize the output variables as outputs

  pinMode(outputD6, OUTPUT);

  pinMode(outputD7, OUTPUT);

  pinMode(outputD0, OUTPUT);

  // Set outputs to LOW

  digitalWrite(outputD6, LOW);

  digitalWrite(outputD7, LOW);

  digitalWrite(outputD0, LOW);

  // 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();

           

            // turns the GPIOs on and off

            if (header.indexOf("GET /D6/on") >= 0) {

              Serial.println("GPIO D6 on");

              outputD6State = "on";

              digitalWrite(outputD6, HIGH);

            } else if (header.indexOf("GET /D6/off") >= 0) {

              Serial.println("GPIO D6 off");

              outputD6State = "off";

              digitalWrite(outputD6, LOW);

            } else if (header.indexOf("GET /D7/on") >= 0) {

              Serial.println("GPIO D7 on");

              outputD7State = "on";

              digitalWrite(outputD7, HIGH);

            } else if (header.indexOf("GET /D7/off") >= 0) {

              Serial.println("GPIO D7 off");

              outputD7State = "off";

              digitalWrite(outputD7, LOW);

            } else if (header.indexOf("GET /D0/on") >= 0) {

              Serial.println("GPIO D0 on");

              outputD0State = "on";

              digitalWrite(outputD0, HIGH);

            } else if (header.indexOf("GET /D0/off") >= 0) {

              Serial.println("GPIO D0 off");

              outputD0State = "off";

              digitalWrite(outputD0, LOW);

            }

           

            // 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>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");

            client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");

            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");

            client.println(".button2 {background-color: #555555;}</style></head>");

           

            // Web Page Heading

            client.println("<body><h1>ESP32 Web Server</h1>");

           

            // Display current state, and ON/OFF buttons for GPIO D6  

            client.println("<p>GPIO D6 - State " + outputD6State + "</p>");

            // If the outputD6State is off, it displays the ON button      

            if (outputD6State=="off") {

              client.println("<p><a href=\"/D6/on\"><button class=\"button\">ON</button></a></p>");

            } else {

              client.println("<p><a href=\"/D6/off\"><button class=\"button button2\">OFF</button></a></p>");

            }

               

            // Display current state, and ON/OFF buttons for GPIO D7  

            client.println("<p>GPIO D7 - State " + outputD7State + "</p>");

            // If the outputD7State is off, it displays the ON button      

            if (outputD7State=="off") {

              client.println("<p><a href=\"/D7/on\"><button class=\"button\">ON</button></a></p>");

            } else {

              client.println("<p><a href=\"/D7/off\"><button class=\"button button2\">OFF</button></a></p>");

            }

 // Display current state, and ON/OFF buttons for GPIO D0  

            client.println("<p>GPIO D0 - State " + outputD0State + "</p>");

            // If the outputD0State is off, it displays the ON button      

            if (outputD0State=="off") {

              client.println("<p><a href=\"/D0/on\"><button class=\"button\">ON</button></a></p>");

            } else {

              client.println("<p><a href=\"/D0/off\"><button class=\"button button2\">OFF</button></a></p>");

            }

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

           

            // 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("");

  }

}