/* -*- c++ -*- */
/*
 * Copyright 2010-2016 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio 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, or (at your option)
 * any later version.
 *
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "usrp_block_impl.h"
#include <gnuradio/uhd/usrp_source.h>
#include <uhd/convert.hpp>
#include <boost/thread/mutex.hpp>

static const pmt::pmt_t TIME_KEY = pmt::string_to_symbol("rx_time");
static const pmt::pmt_t RATE_KEY = pmt::string_to_symbol("rx_rate");
static const pmt::pmt_t FREQ_KEY = pmt::string_to_symbol("rx_freq");

namespace gr {
  namespace uhd {

    inline io_signature::sptr
    args_to_io_sig(const ::uhd::stream_args_t &args)
    {
      const size_t nchan = std::max<size_t>(args.channels.size(), 1);
      const size_t size = ::uhd::convert::get_bytes_per_item(args.cpu_format);
      return io_signature::make(nchan, nchan, size);
    }

    /***********************************************************************
     * UHD Multi USRP Source Impl
     **********************************************************************/
    class usrp_source_impl : public usrp_source, public usrp_block_impl
    {
    public:
      usrp_source_impl(const ::uhd::device_addr_t &device_addr,
                       const ::uhd::stream_args_t &stream_args,
                       const bool issue_stream_cmd_on_start = true);
      ~usrp_source_impl();

      // Get Commands
      ::uhd::dict<std::string, std::string> get_usrp_info(size_t chan);
      std::string get_subdev_spec(size_t mboard);
      double get_samp_rate(void);
      ::uhd::meta_range_t get_samp_rates(void);
      double get_center_freq(size_t chan);
      ::uhd::freq_range_t get_freq_range(size_t chan);
      double get_gain(size_t chan);
      double get_gain(const std::string &name, size_t chan);
      double get_normalized_gain(size_t chan);
      std::vector<std::string> get_gain_names(size_t chan);
      ::uhd::gain_range_t get_gain_range(size_t chan);
      ::uhd::gain_range_t get_gain_range(const std::string &name, size_t chan);
      std::string get_antenna(size_t chan);
      std::vector<std::string> get_antennas(size_t chan);
      ::uhd::sensor_value_t get_sensor(const std::string &name, size_t chan);
      std::vector<std::string> get_sensor_names(size_t chan);
      ::uhd::usrp::dboard_iface::sptr get_dboard_iface(size_t chan);
      std::vector<std::string> get_lo_names(size_t chan);
      const std::string get_lo_source(const std::string &name, size_t chan);
      std::vector<std::string> get_lo_sources(const std::string &name, size_t chan);
      bool get_lo_export_enabled(const std::string &name, size_t chan);
      double get_lo_freq(const std::string &name, size_t chan);
      ::uhd::freq_range_t get_lo_freq_range(const std::string &name, size_t chan);

      // Set Commands
      void set_subdev_spec(const std::string &spec, size_t mboard);
      void set_samp_rate(double rate);
      ::uhd::tune_result_t set_center_freq(const ::uhd::tune_request_t tune_request,
                                         size_t chan);
      void set_gain(double gain, size_t chan);
      void set_gain(double gain, const std::string &name, size_t chan);
      void set_normalized_gain(double gain, size_t chan);
      void set_antenna(const std::string &ant, size_t chan);
      void set_bandwidth(double bandwidth, size_t chan);
      double get_bandwidth(size_t chan);
      ::uhd::freq_range_t get_bandwidth_range(size_t chan);
      void set_auto_dc_offset(const bool enable, size_t chan);
      void set_dc_offset(const std::complex<double> &offset, size_t chan);
      void set_auto_iq_balance(const bool enable, size_t chan);
      void set_iq_balance(const std::complex<double> &correction, size_t chan);
      void set_stream_args(const ::uhd::stream_args_t &stream_args);
      void set_start_time(const ::uhd::time_spec_t &time);
      void set_lo_source(const std::string &src, const std::string &name = ALL_LOS, size_t chan = 0);
      void set_lo_export_enabled(bool enabled, const std::string &name = ALL_LOS, size_t chan = 0);
      double set_lo_freq(double freq, const std::string &name, size_t chan);

      void issue_stream_cmd(const ::uhd::stream_cmd_t &cmd);
      void set_recv_timeout(const double timeout, const bool one_packet);
      void flush(void);
      bool start(void);
      bool stop(void);
      std::vector<std::complex<float> > finite_acquisition(const size_t nsamps);
      std::vector<std::vector<std::complex<float> > > finite_acquisition_v(const size_t nsamps);
      int work(int noutput_items,
               gr_vector_const_void_star &input_items,
               gr_vector_void_star &output_items);

      void setup_rpc();

    private:
      //! Like set_center_freq(), but uses _curr_freq and _curr_lo_offset
      ::uhd::tune_result_t _set_center_freq_from_internals(size_t chan, pmt::pmt_t direction);
      void _cmd_handler_tag(const pmt::pmt_t &tag);

      ::uhd::rx_streamer::sptr _rx_stream;
      size_t _samps_per_packet;
      //! Timeout value for UHD's recv() call. Lower values mean lower latency.
      double _recv_timeout;
      //! one_packet value for UHD's recv() call. 'true' is lower latency.
      bool _recv_one_packet;

      bool _tag_now;
      ::uhd::rx_metadata_t _metadata;
      pmt::pmt_t _id;
      bool _issue_stream_cmd_on_start;

      //tag shadows
      double _samp_rate;

      boost::recursive_mutex d_mutex;
    };

  } /* namespace uhd */
} /* namespace gr */