#!@PYSHEBANG@
# @GENERATED@
#
# This file is Copyright 2010 by the GPSD project
# SPDX-License-Identifier: BSD-2-clause
#
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
# Codacy D203 and D211 conflict, I choose D203
# Codacy D212 and D213 conflict, I choose D212

"""
ntpshmviz - graph the drift of NTP servers

Written by Keane Wolter <daemoneye2@gmail.com>
"""
#
# To do:
#
# 1. Add exit button so the user does not need to do <Ctrl>-w
# 2. Allow for a continuous stream of data to be graphed

from __future__ import absolute_import, print_function, division

import argparse
import sys
try:
    import matplotlib.pyplot as PLT
except ImportError:
    print("Please make sure matplotlib is installed properly:",
          sys.exc_info()[0])
    sys.exit(1)

gps_version = '@VERSION@'
ns_per_s = 1e9


class ntpOffset(object):
    """The master Class."""

    def __init__(self, stream):
        """Initialize class ntpOffset."""
        # get the data
        self.read_data(stream)

        # display the data
        self.display()

    def display(self):
        """Display the graphs."""
        # Alert the user that closing the graphs can be done with "Ctrl-w"
        print("Please note that the graph can be closed with the "
              "key combination of <Ctrl-w>")

        PLT.figure()
        subplot_value = 211
        for ntp_item in self.ntp_data:
            # create the subplot for the data
            PLT.subplot(subplot_value)
            # setup and create the vlines graph
            t = range(0, self.line_counts[ntp_item], 1)
            PLT.vlines(t, 0, self.ntp_data[ntp_item], color='r')
            # add labels
            PLT.title("NTP drift for " + ntp_item)
            PLT.xlabel('sample')
            PLT.ylabel('drift')
            # increment the subplot by 1.
            # this allows for each data group to have it's own graph
            subplot_value += 1

        # make sure there is no graph or data overlapping each other and
        # display the graph
        PLT.tight_layout()
        PLT.show()

    def read_data(self, stream):
        """Read data from a ntp log file."""
        # Layout is:
        #
        #   - The keyword "sample"
        #   - The NTP unit from which it was collected.
        #   - Collection time of day, expressed in seconds
        #   - Receiver time of day, expressed in seconds
        #   - Clock time of day, expressed in seconds
        #   - Leep-second notification status
        #   - Source precision (log(2) of source jitter)

        self.ntp_data = {}      # data sets for each ntp unit
        self.line_counts = {}   # Count of total lines for each ntp unit
        record = []             # A single record in the file or data stream
        offset = 0              # offset value to add to the array
        self.lines = 0          # width of graph

        for line in stream:
            line = line.lstrip()
            record = line.split()
            if len(record) > 6 and line[0] != '#':
                try:
                    then = record[3].split('.')
                    nows = record[4].split('.')
                    offset = (int(then[0]) - int(nows[0])) * ns_per_s
                    offset += (int(then[1]) - int(nows[1]))
                    offset /= float(ns_per_s)
                except Exception:
                    print("Invalid data: ", sys.exc_info()[0],
                          ". Data was: ", line)
                    continue

                # If the NTP unit is in the dictionary
                # append the offset to the list
                # Otherwise, create a new list in the dictionary
                # and add the offset.
                if record[1] not in self.ntp_data:
                    self.ntp_data[record[1]] = []
                    self.line_counts[record[1]] = 0

                self.ntp_data[record[1]].append(offset)
                self.line_counts[record[1]] += 1
        stream.close()


def args():
    """Handle command line args."""
    parser = argparse.ArgumentParser(description='NTP drift visualizer')
    parser.add_argument('-V', '--version',
                        action='version',
                        help='Get version of GPS project',
                        version="ntpshmviz: version"+str(gps_version))
    return parser.parse_args()


if __name__ == "__main__":
    if len(sys.argv) >= 2:
        arguments = args()

    ntpOffset(sys.stdin)
    sys.exit()
