/* ESP32 HTTP IoT Server Example for Wokwi.com

  https://wokwi.com/projects/320964045035274834

  To test, you need the Wokwi IoT Gateway, as explained here:

  https://docs.wokwi.com/guides/esp32-wifi#the-private-gateway

  Then start the simulation, and open http://localhost:9080
  in another browser tab.

  Note that the IoT Gateway requires a Wokwi Club subscription.
  To purchase a Wokwi Club subscription, go to https://wokwi.com/club
*/

#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <uri/UriBraces.h>

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
// Defining the WiFi channel speeds up the connection:
#define WIFI_CHANNEL 6
const char* host = "pavelka.asp2.cz";

WebServer server(80);

const int LED1 = 26;
const int LED2 = 27;

bool led1State = false;
bool led2State = false;


void setup(void) {
  Serial.begin(115200);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);
  Serial.print("Connecting to WiFi ");
  Serial.print(WIFI_SSID);
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());


}

void loop(void) {
  download_nastaveni();
  delay(100);
}

void download_nastaveni() {
  // Use WiFiClient class to create TCP connections

  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }

  // poptani vsech definovanych nastaveni
  String url = "/data.ashx";
  // prvni parametr, jen kvuli pouziti znaku &
  url += "?par=0";

  
  // poslani poptavanych nastaveni 
  for (int i = 0; i < nastaveni_pocet; i++) {
    url += "&" + nastaveni[i] + "=1";
  }

  // definice vsech stavu, kde doslo ke zmene
  for (int i = 0; i < stavy_pocet; i++) {
    // odesila se jen zmeneny stav
    if (stavy_hodnoty[i] != stavy_hodnoty_prev[i]) {
        url += "&" + stavy[i] + "=" + (String)stavy_hodnoty[i];
    }
  }
  
  //Serial.println(url);

  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");

  //Serial.println("Pripojeno 1");
  
  unsigned long timeout = millis();
  while (client.available() == 0) {
    if (millis() - timeout > 5000) {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }

  //Serial.println("Pripojeno 2");

  // cteni vsech nastaveni z resultu
  String result = "";
  while(client.available()){
    result += client.readStringUntil('\r');
 }

  //Serial.println(result);


  for (int i = 0; i < nastaveni_pocet; i++) {
    int pozice = result.indexOf(nastaveni[i] + ":");
    int pozice2 = result.indexOf(":", pozice);
    nastaveni_hodnoty[i] = result.substring(pozice2 + 1, pozice2 + 2);
  }

  // prenastaveni stavu na novou a jiz odeslanou hodnotu
  
  for (int i = 0; i < stavy_pocet; i++) {
    stavy_hodnoty_prev[i] = stavy_hodnoty[i];
  }
  
  //Serial.println("closing connection");
}