/**
 *
 * \section COPYRIGHT
 *
 * Copyright 2013-2014 The libLTE Developers. See the
 * COPYRIGHT file at the top-level directory of this distribution.
 *
 * \section LICENSE
 *
 * This file is part of the libLTE library.
 *
 * libLTE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * libLTE 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 Lesser General Public License for more details.
 *
 * A copy of the GNU Lesser General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#include <uhd/usrp/multi_usrp.hpp>
#include <iostream>
#include <complex>
#include <cstdio>
#include <uhd/utils/msg.hpp>

#include "cuhd_handler.hpp"
#include "liblte/cuhd/cuhd.h"

//#define METADATA_VERBOSE

void my_handler(uhd::msg::type_t type, const std::string & msg)
{
  //handle the message...
}

typedef _Complex float complex_t;

#define SAMPLE_SZ sizeof(complex_t)

bool isLocked(void *h)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  std::vector < std::string > mb_sensors =
    handler->usrp->get_mboard_sensor_names();
  std::vector < std::string > rx_sensors =
    handler->usrp->get_rx_sensor_names(0);
  if (std::find(rx_sensors.begin(), rx_sensors.end(), "lo_locked") !=
      rx_sensors.end()) {
    return handler->usrp->get_rx_sensor("lo_locked", 0).to_bool();
  } else if (std::find(mb_sensors.begin(), mb_sensors.end(), "ref_locked") !=
             mb_sensors.end()) {
    return handler->usrp->get_mboard_sensor("ref_locked", 0).to_bool();
  } else {
    usleep(500);
    return true;
  }
}

bool cuhd_rx_wait_lo_locked(void *h)
{

  double report = 0.0;
  while (isLocked(h) && report < 3.0) {
    report += 0.1;
    usleep(1000);
  }
  return isLocked(h);
}

int cuhd_start_rx_stream(void *h)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
  cmd.time_spec = handler->usrp->get_time_now();
  cmd.stream_now = true;
  handler->usrp->issue_stream_cmd(cmd);
  return 0;
}

int cuhd_stop_rx_stream(void *h)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
  cmd.time_spec = handler->usrp->get_time_now();
  cmd.stream_now = true;
  handler->usrp->issue_stream_cmd(cmd);
  return 0;
}

void cuhd_flush_buffer(void *h)
{
  int n; 
  _Complex float tmp[1024];
  do {
    n = cuhd_recv(h, tmp, 1024, 0);
  } while (n > 0);  
}

int cuhd_start_rx_stream_nsamples(void *h, uint32_t nsamples)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE);
  cmd.time_spec = handler->usrp->get_time_now();
  cmd.stream_now = true;
  cmd.num_samps = nsamples;
  handler->usrp->issue_stream_cmd(cmd);
  return 0;
}

int cuhd_open(char *args, void **h)
{
  cuhd_handler *handler = new cuhd_handler();
  std::string _args = std::string(args);
  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000" + ", num_recv_frames=512");

//  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=50000000" + ", num_recv_frames=512");
  handler->usrp->set_clock_source("internal");

  std::string otw, cpu;
  otw = "sc16";
  cpu = "fc32";
  uhd::stream_args_t stream_args(cpu, otw);
  handler->rx_stream = handler->usrp->get_rx_stream(stream_args);
  handler->tx_stream = handler->usrp->get_tx_stream(stream_args);

  *h = handler;

  return 0;
}

int cuhd_close(void *h)
{
  cuhd_stop_rx_stream(h);
        /** Something else to close the USRP?? */
  return 0;
}


double cuhd_set_rx_srate(void *h, double freq)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_rx_rate(freq);
  double ret = handler->usrp->get_rx_rate();
  return ret;
}

double cuhd_set_rx_gain(void *h, double gain)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_rx_gain(gain);
  return handler->usrp->get_rx_gain();
}

double cuhd_set_rx_freq(void *h, double freq)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_rx_freq(freq);
  return handler->usrp->get_rx_freq();
}

double cuhd_set_rx_freq_offset(void *h, double freq, double off) {
  cuhd_handler* handler = static_cast<cuhd_handler*>(h);
  handler->usrp->set_rx_freq(uhd::tune_request_t(freq,off));
  return handler->usrp->get_rx_freq();
}

int cuhd_recv(void *h, void *data, uint32_t nsamples, bool blocking)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  uhd::rx_metadata_t md;
  if (blocking) {
    int n = 0, p;
    complex_t *data_c = (complex_t *) data;
    do {
      p = handler->rx_stream->recv(&data_c[n], nsamples - n, md);
      if (p == -1) {
        return -1;
      }
      n += p;
#ifdef METADATA_VERBOSE
      if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE) {
        std::cout << "\nError code: " << md.to_pp_string() << "\n\n";
      }
#endif
    } while (n < nsamples);
    return nsamples;
  } else {
    return handler->rx_stream->recv(data, nsamples, md, 0.0);
  }
}

int cuhd_recv_timed(void *h,
                    void *data,
                    uint32_t nsamples,
                    int blocking,
                    time_t *secs,
                    double *frac_secs) {
  cuhd_handler* handler = static_cast<cuhd_handler*>(h);
  uhd::rx_metadata_t md;
  *secs = -1;
  *frac_secs = -1;
  int p;
  if (blocking) {
    int n=0;
    complex_t *data_c = (complex_t*) data;
    do {
      p=handler->rx_stream->recv(&data_c[n], nsamples-n, md);
      if (p == -1) {
        return -1;
      }
      if(*secs < 0){
        *secs = md.time_spec.get_full_secs();
        *frac_secs = md.time_spec.get_frac_secs();
      }
      n+=p;
    } while(n<nsamples);
    return n;
  } else {
    p = handler->rx_stream->recv(data, nsamples, md, 0.0);
    *secs = md.time_spec.get_full_secs();
    *frac_secs = md.time_spec.get_frac_secs();
    return p;
  }
}


double cuhd_set_tx_gain(void *h, double gain)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_tx_gain(gain);
  return handler->usrp->get_tx_gain();
}

double cuhd_set_tx_srate(void *h, double freq)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_tx_rate(freq);
  return handler->usrp->get_tx_rate();
}

double cuhd_set_tx_freq(void *h, double freq)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  handler->usrp->set_tx_freq(freq);
  return handler->usrp->get_tx_freq();
}

int cuhd_send(void *h, void *data, uint32_t nsamples, bool blocking)
{
  cuhd_handler *handler = static_cast < cuhd_handler * >(h);
  uhd::tx_metadata_t md;
  if (blocking) {
    int n = 0, p;
    complex_t *data_c = (complex_t *) data;
    do {
      p = handler->tx_stream->send(&data_c[n], nsamples - n, md);
      if (p == -1) {
        return -1;
      }
      n += p;
    } while (n < nsamples);
    return nsamples;
  } else {
    return handler->tx_stream->send(data, nsamples, md, 0.0);
  }
}