/*
 *  spreadspace avr utils
 *
 *
 *  Copyright (C) 2013-2018 Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of spreadspace avr utils.
 *
 *  spreadspace avr utils is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  spreadspace avr utils is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
 */

#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include <stdio.h>

#include "util.h"
#include "led.h"
#include "usbio.h"

#include "RadioHead.h"
#include "RH_RF95.h"
#include <Crypto.h>
#include <ChaChaPoly.h>
#include "RHAEADDriver.h"

ChaChaPoly cipher;
RH_RF95 lora;
RHAEADDriver aead(lora, cipher);

void recv_aead_msg()
{
  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN+1];
  uint8_t len = sizeof(buf)-1;

  led2_on();
  if(!aead.recv(buf, &len)) {
    printf("aead.recv(): failed\r\n");
    led2_off();
    return;
  }
  buf[len] = 0;

  printf("aead.recv() got message: RSSI = %d, data = ", aead.lastRssi());
  for(uint8_t i = 0; i < len; ++i) printf("%s0x%02X", (i==0) ? "" : " ", buf[i]);
  printf("\r\n");
      // printf("aead.recv() got message: RSSI = %d, data = %s\r\n", aead.lastRssi(), buf);
  led2_off();
}

void send_aead_msg()
{
  uint8_t data[] = "spreadspace.org/avr-utils usb-aead test using radiohead library";
  printf("aead: sending message with %d bytes\r\n", sizeof(data));

  led_on();
  if(!aead.send(data, sizeof(data))) {
    printf("aead.send(): failed\r\n");
    led_off();
    return;
  }
  aead.waitPacketSent();
  printf("aead.send(): success\r\n");
  led_off();
}

void handle_cmd(uint8_t cmd)
{
  switch(cmd) {
  case 's': send_aead_msg(); break;
  default: printf("error\r\n"); return;
  }
}

int main(void)
{
  MCUSR &= ~(1 << WDRF);
  wdt_disable();

  cpu_init();
  led_init();
  usbio_init();
  arduino_init();
  sei();

  lora.init();
  lora.setFrequency(868.0);
  aead.init();

  for(;;) {
    if(aead.available()) {
      recv_aead_msg();
    }

    int16_t BytesReceived = usbio_bytes_received();
    while(BytesReceived > 0) {
      int ReceivedByte = fgetc(stdin);
      if(ReceivedByte != EOF) {
        handle_cmd(ReceivedByte);
      }
      BytesReceived--;
    }

    usbio_task();
  }
}