#!/usr/bin/python3
#
# Copyright 2015 Free Software Foundation
#
# SPDX-License-Identifier: GPL-3.0-or-later
#


import sys
import matplotlib
matplotlib.use("QT4Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from gnuradio.ctrlport.GNURadioControlPortClient import (
    GNURadioControlPortClient, TTransportException,
)
import numpy

"""
If a host is running the ATSC receiver chain with ControlPort
turned on, this script will connect to the host using the hostname and
port pair of the ControlPort instance and display metrics of the
receiver. The ATSC publishes information about the success of the
Reed-Solomon decoder and Viterbi metrics for use here in displaying
the link quality. This also gets the equalizer taps of the receiver
and displays the frequency response.
"""

class atsc_ctrlport_monitor(object):
    def __init__(self, host, port):
        argv = [None, host, port]
        radiosys = GNURadioControlPortClient(argv=argv, rpcmethod='thrift')
        self.radio = radiosys.client
        print(self.radio)


        vt_init_key = 'dtv_atsc_viterbi_decoder0::decoder_metrics'
        data = self.radio.getKnobs([vt_init_key])[vt_init_key]
        init_metric = numpy.mean(data.value)
        self._viterbi_metric = 100*[init_metric,]

        table_col_labels = ('Num Packets', 'Error Rate', 'Packet Error Rate',
                            'Viterbi Metric', 'SNR')

        self._fig = plt.figure(1, figsize=(12,12), facecolor='w')
        self._sp0 = self._fig.add_subplot(4,1,1)
        self._sp1 = self._fig.add_subplot(4,1,2)
        self._sp2 = self._fig.add_subplot(4,1,3)
        self._plot_taps = self._sp0.plot([], [], 'k', linewidth=2)
        self._plot_psd  = self._sp1.plot([], [], 'k', linewidth=2)
        self._plot_data = self._sp2.plot([], [], 'ok', linewidth=2, markersize=4, alpha=0.05)

        self._ax2 = self._fig.add_subplot(4,1,4)
        self._table = self._ax2.table(cellText=[len(table_col_labels)*['0']],
                                      colLabels=table_col_labels,
                                      loc='center')
        self._ax2.axis('off')
        cells = self._table.properties()['child_artists']
        for c in cells:
            c.set_lw(0.1) # set's line width
            c.set_ls('solid')
            c.set_height(0.2)

        ani = animation.FuncAnimation(self._fig, self.update_data, frames=200,
                                      fargs=(self._plot_taps[0], self._plot_psd[0],
                                             self._plot_data[0], self._table),
                                      init_func=self.init_function,
                                      blit=True)
        plt.show()

    def update_data(self, x, taps, psd, syms, table):
        try:
            eqdata_key = 'dtv_atsc_equalizer0::taps'
            symdata_key = 'dtv_atsc_equalizer0::data'
            rs_nump_key = 'dtv_atsc_rs_decoder0::num_packets'
            rs_numbp_key = 'dtv_atsc_rs_decoder0::num_bad_packets'
            rs_numerrs_key = 'dtv_atsc_rs_decoder0::num_errors_corrected'
            vt_metrics_key = 'dtv_atsc_viterbi_decoder0::decoder_metrics'
            snr_key = 'probe2_f0::SNR'

            data = self.radio.getKnobs([])
            eqdata = data[eqdata_key]
            symdata = data[symdata_key]
            rs_num_packets = data[rs_nump_key]
            rs_num_bad_packets = data[rs_numbp_key]
            rs_num_errors_corrected = data[rs_numerrs_key]
            vt_decoder_metrics = data[vt_metrics_key]
            snr_est = data[snr_key]

            vt_decoder_metrics = numpy.mean(vt_decoder_metrics.value)
            self._viterbi_metric.pop()
            self._viterbi_metric.insert(0, vt_decoder_metrics)

        except TTransportException:
            sys.stderr.write("Lost connection, exiting")
            sys.exit(1)

        ntaps = len(eqdata.value)
        taps.set_ydata(eqdata.value)
        taps.set_xdata(list(range(ntaps)))
        self._sp0.set_xlim(0, ntaps)
        self._sp0.set_ylim(min(eqdata.value), max(eqdata.value))

        fs = 6.25e6
        freq = numpy.linspace(-fs / 2, fs / 2, 10000)
        H = numpy.fft.fftshift(numpy.fft.fft(eqdata.value, 10000))
        HdB = 20.0*numpy.log10(abs(H))
        psd.set_ydata(HdB)
        psd.set_xdata(freq)
        self._sp1.set_xlim(0, fs / 2)
        self._sp1.set_ylim([min(HdB), max(HdB)])
        self._sp1.set_yticks([min(HdB), max(HdB)])
        self._sp1.set_yticklabels(["min", "max"])

        nsyms = len(symdata.value)
        syms.set_ydata(symdata.value)
        syms.set_xdata(nsyms*[0,])
        self._sp2.set_xlim([-1, 1])
        self._sp2.set_ylim([-10, 10])

        per = float(rs_num_bad_packets.value) / float(rs_num_packets.value)
        ber = float(rs_num_errors_corrected.value) / float(187*rs_num_packets.value)

        table._cells[(1,0)]._text.set_text("{0}".format(rs_num_packets.value))
        table._cells[(1,1)]._text.set_text("{0:.2g}".format(ber))
        table._cells[(1,2)]._text.set_text("{0:.2g}".format(per))
        table._cells[(1,3)]._text.set_text("{0:.1f}".format(numpy.mean(self._viterbi_metric)))
        table._cells[(1,4)]._text.set_text("{0:.4f}".format(snr_est.value[0]))

        return (taps, psd, syms, table)

    def init_function(self):
        return self._plot_taps + self._plot_psd + self._plot_data

if __name__ == "__main__":
    host = sys.argv[1]
    port = sys.argv[2]
    m = atsc_ctrlport_monitor(host, port)
