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// Load Wi-Fi library
#include <ESP8266WiFi.h>
#include <FastLED.h>
// Replace with your network credentials
const char* ssid     = "BaeschdeWEGE";
const char* password = "wasistdasfuer1Muesli";

// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;

#define LED_PIN     7
#define NUM_LEDS    20

CRGB leds[NUM_LEDS];


// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;

// Function to check if string is a number
boolean isValidNumber(String str){
   for(byte i=0;i<str.length();i++)
   {
      if(!isDigit(str.charAt(i))) return false;
   }
   return true;
}

void setup() {

  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

  Serial.begin(115200);
  // 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,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    currentTime = millis();
    previousTime = currentTime;
    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();

            //Gets the Inputs from the URL
            String hue = header.substring(header.indexOf("hue=")+String("hue=").length(), header.indexOf("hue=")+String("hue=").length()+5);
                while (!isValidNumber(hue)){
                    hue = hue.substring(0, hue.length()-1);
                }
            String lightness = header.substring(header.indexOf("lightness=")+String("lightness=").length(), header.indexOf("lightness=")+String("lightness=").length()+3);
                while (!isValidNumber(lightness)){
                    lightness = lightness.substring(0, lightness.length()-1);
                }
            String statusConst = header.substring(header.indexOf("statusConst=")+String("statusConst=").length(), header.indexOf("statusConst=")+String("statusConst=").length()+1);


            // 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: #FCFCFC; width: 133px; border: none; color: white; padding: 16px 40px;"
                           "text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");

            client.println(".button2 {background-color: #3B3B3B; width: 133px; border: none; color: black; padding: 16px 40px;"
                            "text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}</style></head>;"
                            );

            // Web Page Heading
            client.println("<body style=\"background-color:black;\"><h1><font color=\"white\">LED Control Terminal</font></h1>");

            // If the output5State is off, it displays the ON button
            if(statusConst.toInt() == 1){
                client.println("<p><button class = 'button' ontouchend = \"buttonClick()\" onmouseup = \"buttonClick()\" id=\"button\"><font color=\"black\">ON</font></button></p>");
            } else{
                client.println("<p><button class = 'button2' ontouchend = \"buttonClick()\" onmouseup = \"buttonClick()\" id=\"button\"><font color=\"white\">OFF</font></button></p>");
            }

            client.println("<p>"+hue+"</p>");
            client.println("<p>"+lightness+"</p>");
            //css for sliders
            client.println("<style>"
                            ".slider {"
                              "-webkit-appearance: none;"
                              "width: 100%;"
                              "height: 25px;"
                              "background: linear-gradient(to right, red 0%, #ff0 17%, lime 33%, cyan 50%, blue 66%, #f0f 83%, red 100%);"
                              "outline: none;"
                              "opacity: 1;"
                              "-webkit-transition: .2s;"
                              "transition: opacity .2s;"
                            "}"

                            ".slider:hover {"
                              "opacity: 1;"
                            "}"

                            ".slider::-webkit-slider-thumb {"
                              "-webkit-appearance: none;"
                              "appearance: none;"
                              "width: 25px;"
                              "height: 25px;"
                              "background: hsl(180, 0%, 80%);"
                              "cursor: pointer;"
                              "opacity: 0.7;"
                            "}"

                            ".slider::-moz-range-thumb {"
                              "width: 25px;"
                              "height: 25px;"
                              "background: hsl(180, 0%, 80%);"
                              "cursor: pointer;"
                              "opacity: 0.7;"
                            "}"

                           ".sliderLightness {"
                              "-webkit-appearance: none;"
                              "width: 100%;"
                              "height: 25px;"
                              "background: linear-gradient(to right, hsl("+hue+", 100%, 0%), hsl("+hue+", 100%, 50%), hsl("+hue+", 100%, 100%));"
                              "outline: none;"
                              "opacity: 1;"
                              "-webkit-transition: .2s;"
                              "transition: opacity .2s;"
                            "}"

                            ".sliderLightness:hover {"
                              "opacity: 1;"
                            "}"

                            ".sliderLightness::-webkit-slider-thumb {"
                              "-webkit-appearance: none;"
                              "appearance: none;"
                              "width: 25px;"
                              "height: 25px;"
                              "background: hsl(180, 0%, 80%);"
                              "cursor: pointer;"
                              "opacity: 0.7;"
                            "}"

                            ".sliderLightness::-moz-range-thumb {"
                              "width: 25px;"
                              "height: 25px;"
                              "background: hsl(180, 0%, 80%);"
                              "cursor: pointer;"
                              "opacity: 0.7;"
                            "}"
                          "</style>");

            // create hue slider
            client.println("<div class=\"slidecontainer\">"
                           "<input ontouchend = \"sliderClick()\" onmouseup = \"sliderClick()\" type=\"range\" min=\"0\" max=\"359\" class=\"slider\" id=\"hue\">"
                           "</div>");
            //create  lightness slider
            client.println("<div class=\"slidecontainer\">"
                           "<input ontouchend = \"sliderClick()\" onmouseup = \"sliderClick()\" type=\"range\" min=\"0\" max=\"100\" class=\"sliderLightness\" id=\"lightness\">"
                           "</div>");
            client.println("<p id=\"hue\"></p>"
                           "<p id=\"lightness\"></p>"
                          );

            client.println( "<script type=\"text/javascript\"> "
                            "(function (){"
                            "const urlParams = new URLSearchParams(window.location.search);"
                            "document.getElementById(\"hue\").value = urlParams.get('hue');"
                            "document.getElementById(\"hue\").innerHTML = urlParams.get('hue');"

                            "document.getElementById(\"lightness\").value = urlParams.get('lightness');"
                            "document.getElementById(\"lightness\").innerHTML = urlParams.get('lightness');"

                            "})();"

                            "function buttonClick(){"
                            "const urlParams = new URLSearchParams(window.location.search);"
                            "console.log('bierbierbier');"
                            "if (urlParams.get('statusConst') == 1){"

                      //        "document.getElementById(\"button\").className = 'button2'; "
                      //        "document.getElementById(\"button\").innerHTML = 'OFF';"

                              "urlParams.set(\"statusConst\", 0);"
                              "urlParams.set(\"hue\", document.getElementById(\"hue\").value);"
                              "urlParams.set(\"lightness\", document.getElementById(\"lightness\").value);"
                            "} else{"

                        //      "document.getElementById(\"button\").className = 'button'; "
                       //       "document.getElementById(\"button\").innerHTML = 'ON';"

                              "urlParams.set(\"statusConst\", 1);"
                              "urlParams.set(\"hue\", document.getElementById(\"hue\").value);"
                              "urlParams.set(\"lightness\", document.getElementById(\"lightness\").value);"
                            "}"
                            "window.location.search =urlParams.toString();"
                            "}"


                            "function sliderClick(){"
                            "const urlParams = new URLSearchParams(window.location.search);"
                            "urlParams.set(\"hue\", document.getElementById(\"hue\").value);"
                            "urlParams.set(\"lightness\", document.getElementById(\"lightness\").value);"

                            "var outputHue = document.getElementById(\"hue\");"
                            "var outputLightness = document.getElementById(\"lightness\");"

                            "window.location.search =urlParams.toString();"
                            ""
                            "} </script>"
                          );

            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("");
   }

  // LED control
  // Hue adjustment
    hue = round(hue.toInt()*255/360);
    lightness = round(lightness.toInt()*255/100);
    if (statusConst.toInt()==1){
      for (int i = 0; i <= 19; i++) {
        leds[i] = CHSV ( hue,255, lightness);
        FastLED.show();
        delay(40);
      }
    }

}