/*
 * Copyright (c) 2010, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <stdio.h>
#include <string.h>

#include "contiki.h"

#include "sys/cooja_mt.h"
#include "lib/simEnvChange.h"

#include "net/packetbuf.h"
#include "net/netstack.h"

#include "dev/radio.h"
#include "dev/cooja-radio.h"

#define COOJA_RADIO_BUFSIZE PACKETBUF_SIZE
#define CCA_SS_THRESHOLD -95

const struct simInterface radio_interface;

/* COOJA */
char simReceiving = 0;
char simInDataBuffer[COOJA_RADIO_BUFSIZE];
int simInSize = 0;
rtimer_clock_t simLastPacketTimestamp = 0;
char simOutDataBuffer[COOJA_RADIO_BUFSIZE];
int simOutSize = 0;
char simRadioHWOn = 1;
int simSignalStrength = -100;
int simLastSignalStrength = -100;
char simPower = 100;
int simRadioChannel = 26;
int simLQI = 105;

static const void *pending_data;

/* If we are in the polling mode, poll_mode is 1; otherwise 0 */
static int poll_mode = 0; /* default 0, disabled */
static int auto_ack = 0; /* AUTO_ACK is not supported; always 0 */
static int addr_filter = 0; /* ADDRESS_FILTER is not supported; always 0 */
static int send_on_cca = (COOJA_TRANSMIT_ON_CCA != 0);

PROCESS(cooja_radio_process, "cooja radio process");
/*---------------------------------------------------------------------------*/
static void
set_send_on_cca(uint8_t enable)
{
  send_on_cca = enable;
}
/*---------------------------------------------------------------------------*/
static void
set_frame_filtering(int enable)
{
  addr_filter = enable;
}
/*---------------------------------------------------------------------------*/
static void
set_auto_ack(int enable)
{
  auto_ack = enable;
}
/*---------------------------------------------------------------------------*/
static void
set_poll_mode(int enable)
{
  poll_mode = enable;
}
/*---------------------------------------------------------------------------*/
void
radio_set_channel(int channel)
{
  simRadioChannel = channel;
}
/*---------------------------------------------------------------------------*/
void
radio_set_txpower(unsigned char power)
{
  /* 1 - 100: Number indicating output power */
  simPower = power;
}
/*---------------------------------------------------------------------------*/
int
radio_signal_strength_last(void)
{
  return simLastSignalStrength;
}
/*---------------------------------------------------------------------------*/
int
radio_signal_strength_current(void)
{
  return simSignalStrength;
}
/*---------------------------------------------------------------------------*/
int
radio_LQI(void)
{
  return simLQI;
}
/*---------------------------------------------------------------------------*/
static int
radio_on(void)
{
  simRadioHWOn = 1;
  return 1;
}
/*---------------------------------------------------------------------------*/
static int
radio_off(void)
{
  simRadioHWOn = 0;
  return 1;
}
/*---------------------------------------------------------------------------*/
static void
doInterfaceActionsBeforeTick(void)
{
  if(!simRadioHWOn) {
    simInSize = 0;
    return;
  }
  if(simReceiving) {
    simLastSignalStrength = simSignalStrength;
    return;
  }

  if(simInSize > 0) {
    process_poll(&cooja_radio_process);
  }
}
/*---------------------------------------------------------------------------*/
static void
doInterfaceActionsAfterTick(void)
{
}
/*---------------------------------------------------------------------------*/
static int
radio_read(void *buf, unsigned short bufsize)
{
  int tmp = simInSize;

  if(simInSize == 0) {
    return 0;
  }
  if(bufsize < simInSize) {
    simInSize = 0; /* rx flush */
    RIMESTATS_ADD(toolong);
    return 0;
  }

  memcpy(buf, simInDataBuffer, simInSize);
  simInSize = 0;
  if(!poll_mode) {
    packetbuf_set_attr(PACKETBUF_ATTR_RSSI, simSignalStrength);
    packetbuf_set_attr(PACKETBUF_ATTR_LINK_QUALITY, simLQI);
  }

  return tmp;
}
/*---------------------------------------------------------------------------*/
static int
channel_clear(void)
{
  if(simSignalStrength > CCA_SS_THRESHOLD) {
    return 0;
  }
  return 1;
}
/*---------------------------------------------------------------------------*/
static int
radio_send(const void *payload, unsigned short payload_len)
{
  int radiostate = simRadioHWOn;

  /* Simulate turnaround time of 2ms for packets, 1ms for acks*/
#if COOJA_SIMULATE_TURNAROUND
  simProcessRunValue = 1;
  cooja_mt_yield();
  if(payload_len > 3) {
    simProcessRunValue = 1;
    cooja_mt_yield();
  }
#endif /* COOJA_SIMULATE_TURNAROUND */

  if(!simRadioHWOn) {
    /* Turn on radio temporarily */
    simRadioHWOn = 1;
  }
  if(payload_len > COOJA_RADIO_BUFSIZE) {
    return RADIO_TX_ERR;
  }
  if(payload_len == 0) {
    return RADIO_TX_ERR;
  }
  if(simOutSize > 0) {
    return RADIO_TX_ERR;
  }

  /* Transmit on CCA */
#if COOJA_TRANSMIT_ON_CCA
  if(send_on_cca && !channel_clear()) {
    return RADIO_TX_COLLISION;
  }
#endif /* COOJA_TRANSMIT_ON_CCA */

  /* Copy packet data to temporary storage */
  memcpy(simOutDataBuffer, payload, payload_len);
  simOutSize = payload_len;

  /* Transmit */
  while(simOutSize > 0) {
    cooja_mt_yield();
  }

  simRadioHWOn = radiostate;
  return RADIO_TX_OK;
}
/*---------------------------------------------------------------------------*/
static int
prepare_packet(const void *data, unsigned short len)
{
  pending_data = data;
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
transmit_packet(unsigned short len)
{
  int ret = RADIO_TX_ERR;
  if(pending_data != NULL) {
    ret = radio_send(pending_data, len);
  }
  return ret;
}
/*---------------------------------------------------------------------------*/
static int
receiving_packet(void)
{
  return simReceiving;
}
/*---------------------------------------------------------------------------*/
static int
pending_packet(void)
{
  return !simReceiving && simInSize > 0;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(cooja_radio_process, ev, data)
{
  int len;

  PROCESS_BEGIN();

  while(1) {
    PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
    if(poll_mode) {
      continue;
    }

    packetbuf_clear();
    len = radio_read(packetbuf_dataptr(), PACKETBUF_SIZE);
    if(len > 0) {
      packetbuf_set_datalen(len);
      NETSTACK_RDC.input();
    }
  }

  PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static int
init(void)
{
  process_start(&cooja_radio_process, NULL);
  return 1;
}
/*---------------------------------------------------------------------------*/
static radio_result_t
get_value(radio_param_t param, radio_value_t *value)
{
  switch(param) {
  case RADIO_PARAM_RX_MODE:
    *value = 0;
    if(addr_filter) {
      *value |= RADIO_RX_MODE_ADDRESS_FILTER;
    }
    if(auto_ack) {
      *value |= RADIO_RX_MODE_AUTOACK;
    }
    if(poll_mode) {
      *value |= RADIO_RX_MODE_POLL_MODE;
    }
    return RADIO_RESULT_OK;
  case RADIO_PARAM_TX_MODE:
    *value = 0;
    if(send_on_cca) {
      *value |= RADIO_TX_MODE_SEND_ON_CCA;
    }
    return RADIO_RESULT_OK;
  case RADIO_PARAM_LAST_RSSI:
    *value = simSignalStrength;
    return RADIO_RESULT_OK;
  case RADIO_PARAM_LAST_LINK_QUALITY:
    *value = simLQI;
    return RADIO_RESULT_OK;
  default:
    return RADIO_RESULT_NOT_SUPPORTED;
  }
}
/*---------------------------------------------------------------------------*/
static radio_result_t
set_value(radio_param_t param, radio_value_t value)
{
  switch(param) {
  case RADIO_PARAM_RX_MODE:
    if(value & ~(RADIO_RX_MODE_ADDRESS_FILTER |
        RADIO_RX_MODE_AUTOACK | RADIO_RX_MODE_POLL_MODE)) {
      return RADIO_RESULT_INVALID_VALUE;
    }

    /* Only disabling is acceptable for RADIO_RX_MODE_ADDRESS_FILTER */
    if ((value & RADIO_RX_MODE_ADDRESS_FILTER) != 0) {
      return RADIO_RESULT_NOT_SUPPORTED;
    }
    set_frame_filtering((value & RADIO_RX_MODE_ADDRESS_FILTER) != 0);

    /* Only disabling is acceptable for RADIO_RX_MODE_AUTOACK */
    if ((value & RADIO_RX_MODE_ADDRESS_FILTER) != 0) {
      return RADIO_RESULT_NOT_SUPPORTED;
    }
    set_auto_ack((value & RADIO_RX_MODE_AUTOACK) != 0);

    set_poll_mode((value & RADIO_RX_MODE_POLL_MODE) != 0);
    return RADIO_RESULT_OK;
  case RADIO_PARAM_TX_MODE:
    if(value & ~(RADIO_TX_MODE_SEND_ON_CCA)) {
      return RADIO_RESULT_INVALID_VALUE;
    }
    set_send_on_cca((value & RADIO_TX_MODE_SEND_ON_CCA) != 0);
    return RADIO_RESULT_OK;
  case RADIO_PARAM_CHANNEL:
    if(value < 11 || value > 26) {
      return RADIO_RESULT_INVALID_VALUE;
    }
    radio_set_channel(value);
    return RADIO_RESULT_OK;
  default:
    return RADIO_RESULT_NOT_SUPPORTED;
  }
}
/*---------------------------------------------------------------------------*/
static radio_result_t
get_object(radio_param_t param, void *dest, size_t size)
{
  if(param == RADIO_PARAM_LAST_PACKET_TIMESTAMP) {
    if(size != sizeof(rtimer_clock_t) || !dest) {
      return RADIO_RESULT_INVALID_VALUE;
    }
    *(rtimer_clock_t *)dest = (rtimer_clock_t)simLastPacketTimestamp;
    return RADIO_RESULT_OK;
  }
  return RADIO_RESULT_NOT_SUPPORTED;
}
/*---------------------------------------------------------------------------*/
static radio_result_t
set_object(radio_param_t param, const void *src, size_t size)
{
  return RADIO_RESULT_NOT_SUPPORTED;
}
/*---------------------------------------------------------------------------*/
const struct radio_driver cooja_radio_driver =
{
    init,
    prepare_packet,
    transmit_packet,
    radio_send,
    radio_read,
    channel_clear,
    receiving_packet,
    pending_packet,
    radio_on,
    radio_off,
    get_value,
    set_value,
    get_object,
    set_object
};
/*---------------------------------------------------------------------------*/
SIM_INTERFACE(radio_interface,
              doInterfaceActionsBeforeTick,
              doInterfaceActionsAfterTick);