//
// Copyright 2010-2011,2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//

#include <uhd/utils/thread.hpp>
#include <uhd/utils/safe_main.hpp>
#include <uhd/usrp/multi_usrp.hpp>
#include "ascii_art_dft.hpp" //implementation
#include <boost/program_options.hpp>
#include <boost/format.hpp>
#include <curses.h>
#include <iostream>
#include <complex>
#include <cstdlib>
#include <chrono>
#include <thread>

namespace po = boost::program_options;
using std::chrono::high_resolution_clock;

int UHD_SAFE_MAIN(int argc, char *argv[]){
    uhd::set_thread_priority_safe();

    //variables to be set by po
    std::string args, ant, subdev, ref;
    size_t num_bins;
    double rate, freq, gain, bw, frame_rate;
    float ref_lvl, dyn_rng;

    //setup the program options
    po::options_description desc("Allowed options");
    desc.add_options()
        ("help", "help message")
        ("args", po::value<std::string>(&args)->default_value(""), "multi uhd device address args")
        // hardware parameters
        ("rate", po::value<double>(&rate), "rate of incoming samples (sps)")
        ("freq", po::value<double>(&freq), "RF center frequency in Hz")
        ("gain", po::value<double>(&gain), "gain for the RF chain")
        ("ant", po::value<std::string>(&ant), "antenna selection")
        ("subdev", po::value<std::string>(&subdev), "subdevice specification")
        ("bw", po::value<double>(&bw), "analog frontend filter bandwidth in Hz")
        // display parameters
        ("num-bins", po::value<size_t>(&num_bins)->default_value(512), "the number of bins in the DFT")
        ("frame-rate", po::value<double>(&frame_rate)->default_value(5), "frame rate of the display (fps)")
        ("ref-lvl", po::value<float>(&ref_lvl)->default_value(0), "reference level for the display (dB)")
        ("dyn-rng", po::value<float>(&dyn_rng)->default_value(60), "dynamic range for the display (dB)")
        ("ref", po::value<std::string>(&ref)->default_value("internal"), "reference source (internal, external, mimo)")
        ("int-n", "tune USRP with integer-N tuning")
    ;
    po::variables_map vm;
    po::store(po::parse_command_line(argc, argv, desc), vm);
    po::notify(vm);

    //print the help message
    if (vm.count("help") or not vm.count("rate")){
        std::cout << boost::format("UHD RX ASCII Art DFT %s") % desc << std::endl;
        return EXIT_FAILURE;
    }

    //create a usrp device
    std::cout << std::endl;
    std::cout << boost::format("Creating the usrp device with: %s...") % args << std::endl;
    uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);

    //Lock mboard clocks
    usrp->set_clock_source(ref);

     //always select the subdevice first, the channel mapping affects the other settings
    if (vm.count("subdev")) usrp->set_rx_subdev_spec(subdev);

    std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;

    //set the sample rate
    if (not vm.count("rate")){
        std::cerr << "Please specify the sample rate with --rate" << std::endl;
        return EXIT_FAILURE;
    }
    std::cout << boost::format("Setting RX Rate: %f Msps...") % (rate/1e6) << std::endl;
    usrp->set_rx_rate(rate);
    std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate()/1e6) << std::endl << std::endl;

    //set the center frequency
    if (not vm.count("freq")){
        std::cerr << "Please specify the center frequency with --freq" << std::endl;
        return EXIT_FAILURE;
    }
    std::cout << boost::format("Setting RX Freq: %f MHz...") % (freq/1e6) << std::endl;
    uhd::tune_request_t tune_request(freq);
    if(vm.count("int-n")) tune_request.args = uhd::device_addr_t("mode_n=integer");
    usrp->set_rx_freq(tune_request);
    std::cout << boost::format("Actual RX Freq: %f MHz...") % (usrp->get_rx_freq()/1e6) << std::endl << std::endl;

    //set the rf gain
    if (vm.count("gain")){
        std::cout << boost::format("Setting RX Gain: %f dB...") % gain << std::endl;
        usrp->set_rx_gain(gain);
        std::cout << boost::format("Actual RX Gain: %f dB...") % usrp->get_rx_gain() << std::endl << std::endl;
    }

    //set the analog frontend filter bandwidth
    if (vm.count("bw")){
        std::cout << boost::format("Setting RX Bandwidth: %f MHz...") % (bw/1e6) << std::endl;
        usrp->set_rx_bandwidth(bw);
        std::cout << boost::format("Actual RX Bandwidth: %f MHz...") % (usrp->get_rx_bandwidth()/1e6) << std::endl << std::endl;
    }

    //set the antenna
    if (vm.count("ant")) usrp->set_rx_antenna(ant);

    std::this_thread::sleep_for(std::chrono::seconds(1)); //allow for some setup time

    //Check Ref and LO Lock detect
    std::vector<std::string> sensor_names;
    sensor_names = usrp->get_rx_sensor_names(0);
    if (std::find(sensor_names.begin(), sensor_names.end(), "lo_locked") != sensor_names.end()) {
        uhd::sensor_value_t lo_locked = usrp->get_rx_sensor("lo_locked",0);
        std::cout << boost::format("Checking RX: %s ...") % lo_locked.to_pp_string() << std::endl;
        UHD_ASSERT_THROW(lo_locked.to_bool());
    }
    sensor_names = usrp->get_mboard_sensor_names(0);
    if ((ref == "mimo") and (std::find(sensor_names.begin(), sensor_names.end(), "mimo_locked") != sensor_names.end())) {
        uhd::sensor_value_t mimo_locked = usrp->get_mboard_sensor("mimo_locked",0);
        std::cout << boost::format("Checking RX: %s ...") % mimo_locked.to_pp_string() << std::endl;
        UHD_ASSERT_THROW(mimo_locked.to_bool());
    }
    if ((ref == "external") and (std::find(sensor_names.begin(), sensor_names.end(), "ref_locked") != sensor_names.end())) {
        uhd::sensor_value_t ref_locked = usrp->get_mboard_sensor("ref_locked",0);
        std::cout << boost::format("Checking RX: %s ...") % ref_locked.to_pp_string() << std::endl;
        UHD_ASSERT_THROW(ref_locked.to_bool());
    }

    //create a receive streamer
    uhd::stream_args_t stream_args("fc32"); //complex floats
    uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args);

    //allocate recv buffer and metatdata
    uhd::rx_metadata_t md;
    std::vector<std::complex<float> > buff(num_bins);
    //------------------------------------------------------------------
    //-- Initialize
    //------------------------------------------------------------------
    initscr(); //curses init
    rx_stream->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
    auto next_refresh = high_resolution_clock::now();

    //------------------------------------------------------------------
    //-- Main loop
    //------------------------------------------------------------------
    while (true){
        //read a buffer's worth of samples every iteration
        size_t num_rx_samps = rx_stream->recv(
            &buff.front(), buff.size(), md
        );
        if (num_rx_samps != buff.size()) continue;

        //check and update the display refresh condition
        if (high_resolution_clock::now() < next_refresh) {
            continue;
        }
        next_refresh =
            high_resolution_clock::now()
            + std::chrono::microseconds(int64_t(1e6/frame_rate));

        //calculate the dft and create the ascii art frame
        ascii_art_dft::log_pwr_dft_type lpdft(
            ascii_art_dft::log_pwr_dft(&buff.front(), num_rx_samps)
        );
        std::string frame = ascii_art_dft::dft_to_plot(
            lpdft, COLS, LINES,
            usrp->get_rx_rate(),
            usrp->get_rx_freq(),
            dyn_rng, ref_lvl
        );

        //curses screen handling: clear and print frame
        clear();
        printw("%s", frame.c_str());

        //curses key handling: no timeout, any key to exit
        timeout(0);
        int ch = getch();
        if (ch != KEY_RESIZE and ch != ERR) break;
    }

    //------------------------------------------------------------------
    //-- Cleanup
    //------------------------------------------------------------------
    rx_stream->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
    endwin(); //curses done

    //finished
    std::cout << std::endl << "Done!" << std::endl << std::endl;

    return EXIT_SUCCESS;
}