#include <SPI.h>
#include "WiFi.h"
#include <MFRC522.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>

const char* ssid = "network";
const char* password = "123456789";
String GOOGLE_SCRIPT_ID = "AKfycbxsh9O28pzVBFKb0sHJi5MoHBLnoZ5qJ6ZHRmFBynuENTBroAKVADacxwsgpWmo_u0NeA";
const int number_of_cards = 2;
String NAME[number_of_cards] = {"Name_1",
                                "Name_2"};
String CARD[number_of_cards] = {"D9 B8 21 B9",
                                "D0 3A ED 32"};
String content = "";
// Blue Tag   = D9 B8 21 B9
// White Card = D0 3A ED 32

#define SS_PIN  27  /*Slave Select Pin*/
#define RST_PIN 26  /*Reset Pin for RC522*/

MFRC522 mfrc522(SS_PIN, RST_PIN);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);   /*Serial Communication begin*/
  connect_To_WiFi();
  Setup_LCD_and_RFID_Reader();
}

void loop() {
  Read_RFID_Card_And_Send_Data_To_Google_Sheets();
}//end of Loop


void Setup_LCD_and_RFID_Reader() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Hello, World!");
  SPI.begin();          /*SPI communication initialized*/
  mfrc522.PCD_Init();   /*RFID sensor initialized*/
  Serial.println("Put your card to the reader...");
  Serial.println();
  delay(1000);
  lcd.clear();
}

void Read_RFID_Card_And_Send_Data_To_Google_Sheets() {
  lcd.setCursor(0, 0);
  lcd.print("Scanning...");
  /*Look for the RFID Card*/
  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
    return;
  }
  /*Select Card*/
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
    return;
  }
  /*Show UID for Card/Tag on serial monitor*/
  Serial.print("UID tag :");
  content = "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("Message : ");
  content.toUpperCase();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(content.substring(1));
  for (int i = 0; i < number_of_cards; i++) {
    if (content.substring(1) == CARD[i])
    {
      Serial.println("Authorized access");
      Serial.println();
      lcd.setCursor(0, 1);
      lcd.print("Welcome ");
      lcd.print(NAME[i]);
      send_Data_To_Google_Sheets(NAME[i]);
    }
  }
  lcd.clear();
}



void connect_To_WiFi() {
  Serial.println();
  Serial.print("Connecting to wifi: ");
  Serial.println(ssid);
  Serial.flush();
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void send_Data_To_Google_Sheets(String DataToSend) {
  if (WiFi.status() == WL_CONNECTED) {
    static bool flag = false;
    String urlFinal = "https://script.google.com/macros/s/" + GOOGLE_SCRIPT_ID + "/exec?" + "name=" + String(DataToSend);
    Serial.print("POST data to spreadsheet:");
    Serial.println(urlFinal);
    HTTPClient http;
    http.begin(urlFinal.c_str());
    http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
    int httpCode = http.GET();
    Serial.print("HTTP Status Code: ");
    Serial.println(httpCode);
    //---------------------------------------------------------------------
    //getting response from google sheet
    String payload;
    if (httpCode > 0) {
      payload = http.getString();
      Serial.println("Payload: " + payload);
    }
    //---------------------------------------------------------------------
    http.end();
  }
  delay(1000);
}