// Libraries
#include <WiFi.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <AsyncElegantOTA.h>

// Pin Definitions
#define relayPin  13 // ✔
#define RXp2 16
#define TXp2 17

// Objects and Communication Chanel
AsyncWebServer server(80);


// Command to Read RFID Tags Using RF-KLM900S TTL Connector
// Single Read  BB 00 22 00 00 22 7E
byte A[] = {0xBB, 0x00, 0x22, 0x00, 0x00, 0x22, 0x7E};

// Saved RFID Tags in one String Array
// [1] Card  Tag   UID : 30 08 33 B2 DD D9 01 40 00 00 00 00
// [2] Smart Tag 1 UID : E2 80 68 94 00 00 50 20 91 08 58 7E
// [3] Smart Tag 2 UID : E2 80 68 94 00 00 50 20 91 08 58 88
String TagNo[] =       {"30 08 33 B2 DD D9 01 40 00 00 00 00",
                        "E2 80 68 94 00 00 50 20 91 08 58 7E",
                        "E2 80 68 94 00 00 50 20 91 08 58 88"
                       };

// Variables and Flags
const char* ssid = "network";
const char* password = "123456789";
String TagID_RX = "";
static String inputString;
long distance;
long duration;
int numOfTags = 3;
int flag = 0;
int flag3min = 0;
static unsigned long currentTime = 0;
static unsigned long lastTime2 = 0;
int count = 0;

void setup() {
  // Communication Chanel Between ESP32 and PC/Laptop/Android Phone
  Serial.begin(9600);

  // Communication Chanel Between Arduino Uno and ESP32
  Serial2.begin(9600, SERIAL_8N1, RXp2, TXp2);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  // Wait for connection
  //while (WiFi.status() != WL_CONNECTED) {
  //  delay(500);
  //  Serial.print(".");
  //}
  delay(2000);
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  server.on("/", HTTP_GET, [](AsyncWebServerRequest * request) {
    request->send(200, "text/plain", "Hi! This is ESP32 OTA");
  });

  AsyncElegantOTA.begin(&server);    // Start AsyncElegantOTA
  server.begin();
  Serial.println("HTTP server started");


  // Assign Inputs and Outputs
  pinMode(relayPin, OUTPUT);


  // Close Servo Gate
  digitalWrite(relayPin, LOW);

}

void loop() {
  AsyncElegantOTA.loop();

  static String inputString;
  inputString = Serial2.readString();
  if (1) { //inputString != "") {
    TagID_RX = inputString.substring(0, 35);;
    if (TagID_RX == "") {}
    else {
      server.on("/ID", HTTP_GET, [](AsyncWebServerRequest * request) {
        request->send(200, "text/plain", TagID_RX);
      });
      Serial.print("<Start>");
      Serial.print(TagID_RX);
      Serial.println("<End>");
    }
    for (int i = 0; i < numOfTags; i++) {
      if (!TagID_RX.compareTo(TagNo[i]) && distance <= 200) {
        Serial.print("Tag No [");
        Serial.print(i + 1);
        Serial.println("] Found.");
        Serial.println("------------------");

        if (flag == 0) {
          // Push Garage Button for 200mS then release
          digitalWrite(relayPin, HIGH);
          delay(200);
          digitalWrite(relayPin, LOW);
        }
        // Set Falgs
        flag = 1;
        flag3min = 0;
        count = 0;
        lastTime2 = millis();
      }
      else {
        if (count > 10 && flag == 1) {
          if (flag3min == 0) {
            //Serial.println("10 seconds Timer Started !!");
            flag3min = 1;
          }
          currentTime = millis();
          if (currentTime - lastTime2 > 10000) {
            lastTime2 = millis();

            // Push Garage Button for 200mS then release
            digitalWrite(relayPin, HIGH);
            delay(200);
            digitalWrite(relayPin, LOW);

            // Reset Flags
            count = 0;
            flag = 0;
            flag3min = 0;
          }
        }
        count++;
      }
    }
    inputString = "";
  }
}