// Import required libraries
#include <WiFi.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include "SPIFFS.h"

// Replace with your network credentials
const char* ssid     = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";

const int output = 14; //red led

String sliderValue = "0";

// setting PWM properties
const int freq = 5000;
const int ledChannel = 0;
const int resolution = 8;

const char* PARAM_INPUT = "value";

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

// Replaces placeholder with button section in your web page
String processor(const String& var){
  Serial.println(var);
  /*if (var == "SLIDERVALUE"){
    return sliderValue;
  }*/
  return String();
}

void setup(){
  // Serial port for debugging purposes
  Serial.begin(115200);
  
   // Initialize SPIFFS
  if(!SPIFFS.begin(true)){
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(output, ledChannel);
  
  ledcWrite(ledChannel, sliderValue.toInt());

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }

  // Print ESP Local IP Address
  Serial.println(WiFi.localIP());

  // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
     request->send(SPIFFS, "/index.html", String(), false, processor);
    
  });

  // Send a GET request to <ESP_IP>/slider?value=<inputMessage>
  server.on("/slider_r", HTTP_GET, [] (AsyncWebServerRequest *request) {
    String inputMessage;
    // GET input1 value on <ESP_IP>/slider?value=<inputMessage>
    if (request->hasParam(PARAM_INPUT)) {
      inputMessage = request->getParam(PARAM_INPUT)->value();
      sliderValue = inputMessage;
      Serial.println(sliderValue.toInt());
      ledcWrite(ledChannel, 255 - sliderValue.toInt());
    }
    else {
      inputMessage = "No message sent";
    }
    
    request->send(200, "text/plain", "OK");
  });
  
  // Start server
  server.begin();
}
  
void loop() {
  
}