/* -*- c++ -*- */
/*
 * Copyright 2011-2013 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "time_sink_c_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/prefs.h>
#include <string.h>
#include <volk/volk.h>
#include <gnuradio/fft/fft.h>
#include <qwt_symbol.h>

namespace gr {
  namespace qtgui {

    time_sink_c::sptr
    time_sink_c::make(int size, double samp_rate,
		      const std::string &name,
		      int nconnections,
		      QWidget *parent)
    {
      return gnuradio::get_initial_sptr
	(new time_sink_c_impl(size, samp_rate, name, nconnections, parent));
    }

    time_sink_c_impl::time_sink_c_impl(int size, double samp_rate,
				       const std::string &name,
				       int nconnections,
				       QWidget *parent)
      : sync_block("time_sink_c",
                   io_signature::make(nconnections, nconnections, sizeof(gr_complex)),
                   io_signature::make(0, 0, 0)),
	d_size(size), d_buffer_size(2*size), d_samp_rate(samp_rate), d_name(name),
	d_nconnections(2*nconnections), d_parent(parent)
    {
      // Required now for Qt; argc must be greater than 0 and argv
      // must have at least one valid character. Must be valid through
      // life of the qApplication:
      // http://harmattan-dev.nokia.com/docs/library/html/qt4/qapplication.html
      d_argc = 1;
      d_argv = new char;
      d_argv[0] = '\0';

      d_main_gui = NULL;

      for(int n = 0; n < d_nconnections; n++) {
	d_buffers.push_back((double*)volk_malloc(d_buffer_size*sizeof(double),
						 volk_get_alignment()));
	memset(d_buffers[n], 0, d_buffer_size*sizeof(double));
      }

      for(int n = 0; n < d_nconnections/2; n++) {
	d_cbuffers.push_back((gr_complex*)volk_malloc(d_buffer_size*sizeof(gr_complex),
                                                      volk_get_alignment()));
	memset(d_cbuffers[n], 0, d_buffer_size*sizeof(gr_complex));
      }

      // Set alignment properties for VOLK
      const int alignment_multiple =
	volk_get_alignment() / sizeof(gr_complex);
      set_alignment(std::max(1,alignment_multiple));

      d_tags = std::vector< std::vector<gr::tag_t> >(d_nconnections/2);

      initialize();

      d_main_gui->setNPoints(d_size); // setup GUI box with size
      set_trigger_mode(TRIG_MODE_FREE, TRIG_SLOPE_POS, 0, 0, 0);

      set_history(2);          // so we can look ahead for the trigger slope
      declare_sample_delay(1); // delay the tags for a history of 2
    }

    time_sink_c_impl::~time_sink_c_impl()
    {
      if(!d_main_gui->isClosed())
        d_main_gui->close();

      // d_main_gui is a qwidget destroyed with its parent
      for(int n = 0; n < d_nconnections; n++) {
	volk_free(d_buffers[n]);
      }
      for(int n = 0; n < d_nconnections/2; n++) {
        volk_free(d_cbuffers[n]);
      }

      delete d_argv;
    }

    bool
    time_sink_c_impl::check_topology(int ninputs, int noutputs)
    {
      return 2*ninputs == d_nconnections;
    }

    void
    time_sink_c_impl::initialize()
    {
      if(qApp != NULL) {
	d_qApplication = qApp;
      }
      else {
#if QT_VERSION >= 0x040500
        std::string style = prefs::singleton()->get_string("qtgui", "style", "raster");
        QApplication::setGraphicsSystem(QString(style.c_str()));
#endif
	d_qApplication = new QApplication(d_argc, &d_argv);
      }

      // If a style sheet is set in the prefs file, enable it here.
      std::string qssfile = prefs::singleton()->get_string("qtgui","qss","");
      if(qssfile.size() > 0) {
        QString sstext = get_qt_style_sheet(QString(qssfile.c_str()));
        d_qApplication->setStyleSheet(sstext);
      }

      d_main_gui = new TimeDisplayForm(d_nconnections, d_parent);
      d_main_gui->setNPoints(d_size);
      d_main_gui->setSampleRate(d_samp_rate);

      if(d_name.size() > 0)
        set_title(d_name);

      // initialize update time to 10 times a second
      set_update_time(0.1);
    }

    void
    time_sink_c_impl::exec_()
    {
      d_qApplication->exec();
    }

    QWidget*
    time_sink_c_impl::qwidget()
    {
      return d_main_gui;
    }

#ifdef ENABLE_PYTHON
    PyObject*
    time_sink_c_impl::pyqwidget()
    {
      PyObject *w = PyLong_FromVoidPtr((void*)d_main_gui);
      PyObject *retarg = Py_BuildValue("N", w);
      return retarg;
    }
#else
    void *
    time_sink_c_impl::pyqwidget()
    {
      return NULL;
    }
#endif

    void
    time_sink_c_impl::set_y_axis(double min, double max)
    {
      d_main_gui->setYaxis(min, max);
    }

    void
    time_sink_c_impl::set_y_label(const std::string &label,
                                  const std::string &unit)
    {
      d_main_gui->setYLabel(label, unit);
    }

    void
    time_sink_c_impl::set_update_time(double t)
    {
      //convert update time to ticks
      gr::high_res_timer_type tps = gr::high_res_timer_tps();
      d_update_time = t * tps;
      d_main_gui->setUpdateTime(t);
      d_last_time = 0;
    }

    void
    time_sink_c_impl::set_title(const std::string &title)
    {
      d_main_gui->setTitle(title.c_str());
    }

    void
    time_sink_c_impl::set_line_label(int which, const std::string &label)
    {
      d_main_gui->setLineLabel(which, label.c_str());
    }

    void
    time_sink_c_impl::set_line_color(int which, const std::string &color)
    {
      d_main_gui->setLineColor(which, color.c_str());
    }

    void
    time_sink_c_impl::set_line_width(int which, int width)
    {
      d_main_gui->setLineWidth(which, width);
    }

    void
    time_sink_c_impl::set_line_style(int which, int style)
    {
      d_main_gui->setLineStyle(which, (Qt::PenStyle)style);
    }

    void
    time_sink_c_impl::set_line_marker(int which, int marker)
    {
      d_main_gui->setLineMarker(which, (QwtSymbol::Style)marker);
    }

    void
    time_sink_c_impl::set_line_alpha(int which, double alpha)
    {
      d_main_gui->setMarkerAlpha(which, (int)(255.0*alpha));
    }

    void
    time_sink_c_impl::set_trigger_mode(trigger_mode mode,
                                       trigger_slope slope,
                                       float level,
                                       float delay, int channel,
                                       const std::string &tag_key)
    {
      gr::thread::scoped_lock lock(d_setlock);

      d_trigger_mode = mode;
      d_trigger_slope = slope;
      d_trigger_level = level;
      d_trigger_delay = static_cast<int>(delay*d_samp_rate);
      d_trigger_channel = channel;
      d_trigger_tag_key = pmt::intern(tag_key);
      d_triggered = false;
      d_trigger_count = 0;

      if((d_trigger_delay < 0) || (d_trigger_delay >= d_size)) {
        GR_LOG_WARN(d_logger, boost::format("Trigger delay (%1%) outside of display range (0:%2%).") \
                    % (d_trigger_delay/d_samp_rate) % ((d_size-1)/d_samp_rate));
        d_trigger_delay = std::max(0, std::min(d_size-1, d_trigger_delay));
        delay = d_trigger_delay/d_samp_rate;
      }

      d_main_gui->setTriggerMode(d_trigger_mode);
      d_main_gui->setTriggerSlope(d_trigger_slope);
      d_main_gui->setTriggerLevel(d_trigger_level);
      d_main_gui->setTriggerDelay(delay);
      d_main_gui->setTriggerChannel(d_trigger_channel);
      d_main_gui->setTriggerTagKey(tag_key);

      _reset();
    }

    void
    time_sink_c_impl::set_size(int width, int height)
    {
      d_main_gui->resize(QSize(width, height));
    }

    std::string
    time_sink_c_impl::title()
    {
      return d_main_gui->title().toStdString();
    }

    std::string
    time_sink_c_impl::line_label(int which)
    {
      return d_main_gui->lineLabel(which).toStdString();
    }

    std::string
    time_sink_c_impl::line_color(int which)
    {
      return d_main_gui->lineColor(which).toStdString();
    }

    int
    time_sink_c_impl::line_width(int which)
    {
      return d_main_gui->lineWidth(which);
    }

    int
    time_sink_c_impl::line_style(int which)
    {
      return d_main_gui->lineStyle(which);
    }

    int
    time_sink_c_impl::line_marker(int which)
    {
      return d_main_gui->lineMarker(which);
    }

    double
    time_sink_c_impl::line_alpha(int which)
    {
      return (double)(d_main_gui->markerAlpha(which))/255.0;
    }

    void
    time_sink_c_impl::set_nsamps(const int newsize)
    {
      if(newsize != d_size) {
        gr::thread::scoped_lock lock(d_setlock);

	// Set new size and reset buffer index
	// (throws away any currently held data, but who cares?)
	d_size = newsize;
        d_buffer_size = 2*d_size;

	// Resize buffers and replace data
	for(int n = 0; n < d_nconnections; n++) {
	  volk_free(d_buffers[n]);
	  d_buffers[n] = (double*)volk_malloc(d_buffer_size*sizeof(double),
                                              volk_get_alignment());
	  memset(d_buffers[n], 0, d_buffer_size*sizeof(double));
	}

	for(int n = 0; n < d_nconnections/2; n++) {
	  volk_free(d_cbuffers[n]);
	  d_cbuffers[n] = (gr_complex*)volk_malloc(d_buffer_size*sizeof(gr_complex),
                                                   volk_get_alignment());
	  memset(d_cbuffers[n], 0, d_buffer_size*sizeof(gr_complex));
	}

        // If delay was set beyond the new boundary, pull it back.
        if(d_trigger_delay >= d_size) {
          GR_LOG_WARN(d_logger, boost::format("Trigger delay (%1%) outside of display range (0:%2%). Moving to 50%% point.") \
                      % (d_trigger_delay/d_samp_rate) % ((d_size-1)/d_samp_rate));
          d_trigger_delay = d_size/2;
          d_main_gui->setTriggerDelay(d_trigger_delay/d_samp_rate);
        }

	d_main_gui->setNPoints(d_size);
        _reset();
      }
    }

    void
    time_sink_c_impl::set_samp_rate(const double samp_rate)
    {
      gr::thread::scoped_lock lock(d_setlock);
      d_samp_rate = samp_rate;
      d_main_gui->setSampleRate(d_samp_rate);
    }

    int
    time_sink_c_impl::nsamps() const
    {
      return d_size;
    }

    void
    time_sink_c_impl::enable_menu(bool en)
    {
      d_main_gui->enableMenu(en);
    }

    void
    time_sink_c_impl::enable_grid(bool en)
    {
      d_main_gui->setGrid(en);
    }

    void
    time_sink_c_impl::enable_autoscale(bool en)
    {
      d_main_gui->autoScale(en);
    }

    void
    time_sink_c_impl::enable_stem_plot(bool en)
    {
      d_main_gui->setStem(en);
    }

    void
    time_sink_c_impl::enable_semilogx(bool en)
    {
      d_main_gui->setSemilogx(en);
    }

    void
    time_sink_c_impl::enable_semilogy(bool en)
    {
      d_main_gui->setSemilogy(en);
    }

    void
    time_sink_c_impl::enable_control_panel(bool en)
    {
      if(en)
        d_main_gui->setupControlPanel();
      else
        d_main_gui->teardownControlPanel();
    }

    void
    time_sink_c_impl::enable_tags(int which, bool en)
    {
      if(which == -1) {
        for(int n = 0; n < d_nconnections; n++) {
          d_main_gui->setTagMenu(n, en);
        }
      }
      else
        d_main_gui->setTagMenu(which, en);
    }

    void
    time_sink_c_impl::disable_legend()
    {
      d_main_gui->disableLegend();
    }

    void
    time_sink_c_impl::reset()
    {
      gr::thread::scoped_lock lock(d_setlock);
      _reset();
    }

    void
    time_sink_c_impl::_reset()
    {
      int n;
      if(d_trigger_delay) {
        for(n = 0; n < d_nconnections/2; n++) {
          // Move the tail of the buffers to the front. This section
          // represents data that might have to be plotted again if a
          // trigger occurs and we have a trigger delay set.  The tail
          // section is between (d_end-d_trigger_delay) and d_end.
          memmove(d_cbuffers[n], &d_cbuffers[n][d_end-d_trigger_delay],
                  d_trigger_delay*sizeof(gr_complex));

          // Also move the offsets of any tags that occur in the tail
          // section so they would be plotted again, too.
          std::vector<gr::tag_t> tmp_tags;
          for(size_t t = 0; t < d_tags[n].size(); t++) {
            if(d_tags[n][t].offset > (uint64_t)(d_size - d_trigger_delay)) {
              d_tags[n][t].offset = d_tags[n][t].offset - (d_size - d_trigger_delay);
              tmp_tags.push_back(d_tags[n][t]);
            }
          }
          d_tags[n] = tmp_tags;
        }
      }
      // Otherwise, just clear the local list of tags.
      else {
        for(n = 0; n < d_nconnections/2; n++) {
          d_tags[n].clear();
        }
      }

      // Reset the start and end indices.
      d_start = 0;
      d_end = d_size;

      // Reset the trigger. If in free running mode, ignore the
      // trigger delay and always set trigger to true.
      if(d_trigger_mode == TRIG_MODE_FREE) {
        d_index = 0;
        d_triggered = true;
      }
      else {
        d_index = d_trigger_delay;
        d_triggered = false;
      }
    }

    void
    time_sink_c_impl::_npoints_resize()
    {
      int newsize = d_main_gui->getNPoints();
      set_nsamps(newsize);
    }

    void
    time_sink_c_impl::_adjust_tags(int adj)
    {
      for(size_t n = 0; n < d_tags.size(); n++) {
        for(size_t t = 0; t < d_tags[n].size(); t++) {
          d_tags[n][t].offset += adj;
        }
      }
    }

    void
    time_sink_c_impl::_gui_update_trigger()
    {
      d_trigger_mode = d_main_gui->getTriggerMode();
      d_trigger_slope = d_main_gui->getTriggerSlope();
      d_trigger_level = d_main_gui->getTriggerLevel();
      d_trigger_channel = d_main_gui->getTriggerChannel();
      d_trigger_count = 0;

      float delayf = d_main_gui->getTriggerDelay();
      int delay = static_cast<int>(delayf*d_samp_rate);

      if(delay != d_trigger_delay) {
        // We restrict the delay to be within the window of time being
        // plotted.
        if((delay < 0) || (delay >= d_size)) {
          GR_LOG_WARN(d_logger, boost::format("Trigger delay (%1%) outside of display range (0:%2%).") \
                      % (delay/d_samp_rate) % ((d_size-1)/d_samp_rate));
          delay = std::max(0, std::min(d_size-1, delay));
          delayf = delay/d_samp_rate;
        }

        d_trigger_delay = delay;
        d_main_gui->setTriggerDelay(delayf);
        _reset();
      }

      std::string tagkey = d_main_gui->getTriggerTagKey();
      d_trigger_tag_key = pmt::intern(tagkey);
    }

    void
    time_sink_c_impl::_test_trigger_tags(int nitems)
    {
      int trigger_index;

      uint64_t nr = nitems_read(d_trigger_channel/2);
      std::vector<gr::tag_t> tags;
      get_tags_in_range(tags, d_trigger_channel/2,
                        nr, nr + nitems + 1,
                        d_trigger_tag_key);
      if(tags.size() > 0) {
        d_triggered = true;
        trigger_index = tags[0].offset - nr;
        d_start = d_index + trigger_index - d_trigger_delay - 1;
        d_end = d_start + d_size;
        d_trigger_count = 0;
        _adjust_tags(-d_start);
      }
    }

    void
    time_sink_c_impl::_test_trigger_norm(int nitems, gr_vector_const_void_star inputs)
    {
      int trigger_index;
      const gr_complex *in = (const gr_complex*)inputs[d_trigger_channel/2];
      for(trigger_index = 0; trigger_index < nitems; trigger_index++) {
        d_trigger_count++;

        // Test if trigger has occurred based on the input stream,
        // channel number, and slope direction
        if(_test_trigger_slope(&in[trigger_index])) {
          d_triggered = true;
          d_start = d_index + trigger_index - d_trigger_delay;
          d_end = d_start + d_size;
          d_trigger_count = 0;
          _adjust_tags(-d_start);
          break;
        }
      }

      // If using auto trigger mode, trigger periodically even
      // without a trigger event.
      if((d_trigger_mode == TRIG_MODE_AUTO) && (d_trigger_count > d_size)) {
        d_triggered = true;
        d_trigger_count = 0;
      }
    }

    bool
    time_sink_c_impl::_test_trigger_slope(const gr_complex *in) const
    {
      float x0, x1;
      if(d_trigger_channel % 2 == 0) {
        x0 = in[0].real();
        x1 = in[1].real();
      }
      else {
        x0 = in[0].imag();
        x1 = in[1].imag();
      }

      if(d_trigger_slope == TRIG_SLOPE_POS)
        return ((x0 <= d_trigger_level) && (x1 > d_trigger_level));
      else
        return ((x0 >= d_trigger_level) && (x1 < d_trigger_level));
    }

    int
    time_sink_c_impl::work(int noutput_items,
			   gr_vector_const_void_star &input_items,
			   gr_vector_void_star &output_items)
    {
      int n=0;
      const gr_complex *in;

      _npoints_resize();
      _gui_update_trigger();

      gr::thread::scoped_lock lock(d_setlock);

      int nfill = d_end - d_index;                 // how much room left in buffers
      int nitems = std::min(noutput_items, nfill); // num items we can put in buffers

      // If auto, normal, or tag trigger, look for the trigger
      if((d_trigger_mode != TRIG_MODE_FREE) && !d_triggered) {
        // trigger off a tag key (first one found)
        if(d_trigger_mode == TRIG_MODE_TAG) {
          _test_trigger_tags(nitems);
        }
        // Normal or Auto trigger
        else {
          _test_trigger_norm(nitems, input_items);
        }
      }

      // Copy data into the buffers.
      for(n = 0; n < d_nconnections/2; n++) {
        in = (const gr_complex*)input_items[n];
        memcpy(&d_cbuffers[n][d_index], &in[1], nitems*sizeof(gr_complex));

        uint64_t nr = nitems_read(n);
        std::vector<gr::tag_t> tags;
        get_tags_in_range(tags, n, nr, nr + nitems + 1);
        for(size_t t = 0; t < tags.size(); t++) {
          tags[t].offset = tags[t].offset - nr + (d_index-d_start-1);
        }
        d_tags[n].insert(d_tags[n].end(), tags.begin(), tags.end());
      }
      d_index += nitems;

      // If we've have a trigger and a full d_size of items in the buffers, plot.
      if((d_triggered) && (d_index == d_end)) {
        // Copy data to be plotted to start of buffers.
        for(n = 0; n < d_nconnections/2; n++) {
          volk_32fc_deinterleave_64f_x2(d_buffers[2*n+0], d_buffers[2*n+1],
                                        &d_cbuffers[n][d_start], d_size);
        }

        // Plot if we are able to update
        if(gr::high_res_timer_now() - d_last_time > d_update_time) {
          d_last_time = gr::high_res_timer_now();
          d_qApplication->postEvent(d_main_gui,
                                    new TimeUpdateEvent(d_buffers, d_size, d_tags));
        }

        // We've plotting, so reset the state
        _reset();
      }

      // If we've filled up the buffers but haven't triggered, reset.
      if(d_index == d_end) {
        _reset();
      }

      return nitems;
    }

  } /* namespace qtgui */
} /* namespace gr */
