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#include <Arduino.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <LiquidCrystal_I2C.h>  // LCD header file
#include <WiFi.h>
#include <WiFiClient.h>

int lcdColumns = 20;
int lcdRows = 2;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);
AsyncWebServer server(80);

// Enter your netwrok credentials
const char* ssid = "*******";
const char* password = "*******";
const char* PARAM_INPUT_1 = "data_field1";
const char* PARAM_INPUT_2 = "data_field2";

// HTML web page to handle data input fields

const char index_html[] PROGMEM = R"rawliteral(<!DOCTYPE HTML> <html> <head><title> Cenovka </title><meta name = "viewport" content="width=device-width, initial-scale=1" "utf-8">
<style>html{font-family: Calibri; display: inline-block; text-align: justify; Content-Type: text/html;charset=UTF-8}</style></head> <body><h2>Cenovka</h2><form action="/get">
1. radek <input type="text" name="data_field1" ><input type="submit" value="Post"></form> <br><form action="/get">2. radek <input type="text" name="data_field2"><input type="submit" value="Post">
</form><br><br>Vsechen text musi byt <b>bez</b> diakritiky!</body></html>)rawliteral";

void notFound(AsyncWebServerRequest* request) {
  request->send(404, "text/plain", "Not found");
}

void printOnLine(int line, String message) {
  lcd.setCursor(0, line);
    // % : print a variable
    // - : left justify
    // * : use lcdColumns as minimum width (pad with spaces)
    // s : it's a string type
  lcd.printf("%-*s", lcdColumns, message.c_str());
  Serial.printf("line %d : %-*s\n", line, lcdColumns, message.c_str());    // < prints to serial also
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.println("WiFi Failed!");
    return;
  }
  Serial.println();
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

    //===set LCD
  lcd.begin();
  server.begin();

  server.onNotFound(notFound);
  // Send web page with input fields to client
  server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) {
    request->send(200, "text/html", index_html);
  });
    // respond to GET
  server.on("/get", HTTP_GET, [](AsyncWebServerRequest* request) {
    String inputMessage;
    String inputParam;
    if (request->hasParam(PARAM_INPUT_1)) {
      printOnLine(0, request->getParam(PARAM_INPUT_1)->value());
    } else if (request->hasParam(PARAM_INPUT_2)) {
      printOnLine(1, request->getParam(PARAM_INPUT_2)->value());
    } else {
      // no message sent
    }
    request->send(200, "text/html", " HTTP GET request sent to ESP32(" + inputParam + "): " + inputMessage + "<br><a href=\"/\"> Back to Home Page </a>");
  });
}

void loop() {
  // put your main code here, to run repeatedly:
}