//TODO: Divide interface with screens, each screen is a settings for each feature (address, mode, password, encryption on/off)
//TODO: Learn how to use radio module, transmit data with it
//TODO: Learn how to use mic. in arduino, transmit plain sound among two arduinos and play it
//TODO: Implement encryption and decryption using AES128, test it with text, then use to encrypt sound

#include <LiquidCrystal_I2C.h>
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <AESLib.h>

//Components
LiquidCrystal_I2C lcd(0x27, 16, 2);
RF24 radio(7,8);

//Settings
byte unsigned address = -1;
unsigned short key = 0;
String seed = "1305b5cfa1a59e9789de"; // "random" seed ;)
String password;
bool mode = 0; // 0 = transmit, 1 = recieve, bool is 2 bytes less than byte :)

void switchMode();
void printOutput();
void updatePassword();

void setup() {
  Serial.begin(9600);
  
  //Setting up a radio module
  radio.begin();
  radio.setPALevel(RF24_PA_MIN);
  switchMode(); //default is recieving
  
  //Setting up a LCD
  lcd.init();
  lcd.backlight();

  updatePassword();
}

void loop() {
  switchMode();
  printOutput();
  delay(500);
}

void switchMode () {
  if (mode) {    // transmit -> recieve
    radio.openReadingPipe(0, address);
    radio.startListening();
  } else {        // recieve -> transmit
    radio.openWritingPipe(address);
    radio.stopListening();
  }
  
  mode = !mode;
}

void printOutput () {
   lcd.setCursor(0, 0);
   lcd.print("Mode: ");
   lcd.print(mode? "rec." : "tra.");
   lcd.setCursor(0, 1);
   lcd.print("Addr.: ");
   lcd.print(address);
//   for (int i = 0; i < 5; i ++) lcd.print(address[i] - '0');
   //lcd.print(mode);
}

void updatePassword() {
  password = seed + key;
}