#!/usr/bin/env python3
import argparse
import statistics
import sys
import traceback
import warnings

import cf_speedtest
import cf_speedtest.options as options
import urllib3
from cf_speedtest.speedtest import run_standard_test

import checker.nagios as nagios
from checker import print_icinga2_check_status
from checker.linuxfabric.base import get_state


def run_speedtest():
    # Set up the arguments for the speed test
    argv = ["--percentile", "90", "--testpatience", "15"]

    urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

    parser = argparse.ArgumentParser()
    parser_with_args = options.add_run_options(parser)

    args = parser_with_args.parse_args(argv)
    percentile = args.percentile
    VERIFY_SSL = args.verifyssl
    OUTPUT_FILE = args.output
    patience = args.testpatience
    proxy = args.proxy

    # Taken from speed.cloudflare.com
    # byte count for each test, ranging from 100KB to 250MB
    measurement_sizes = \
        [
            100_000,
            1_000_000,
            10_000_000,
            25_000_000,
            100_000_000,
            250_000_000,
        ]

    def fake_print(*args, **kwargs):
        return

    normal_print = __builtins__.print  # silence the speedtest
    __builtins__.print = fake_print
    speeds = run_standard_test(measurement_sizes, percentile, True, patience)
    __builtins__.print = normal_print

    # Extract the results
    return {
        'download_speed': speeds['download_speed'] / 1_000_000,  # Convert to Mbit/sec
        'upload_speed': speeds['upload_speed'] / 1_000_000,  # Convert to Mbit/sec
        'percentile': f"{args.percentile}{'th percentile results:':<24}",
        'latency': cf_speedtest.speedtest.percentile(speeds['latency_measurements'], 50),  # Median latency in ms
        'jitter': statistics.stdev(speeds['latency_measurements']),  # Jitter in ms
        'raw': speeds
    }


def main():
    """
    Copied from __main__.py
    https://github.com/tevslin/cloudflarepycli/blob/main/src/cloudflarepycli/__main__.py
    """
    parser = argparse.ArgumentParser(description='Check internet speed.')
    parser.add_argument('--warn-up', type=int, default=0, help='Warn level of upload speed in Mbps.')
    parser.add_argument('--critical-up', type=int, default=0, help='Critical level of upload speed in Mbps.')
    parser.add_argument('--warn-down', type=int, default=0, help='Warn level of download speed in Mbps.')
    parser.add_argument('--critical-down', type=int, default=0, help='Critical level of download speed in Mbps.')
    parser.add_argument('--warn-latency', type=int, default=60, help='Warn level of latency in ms.')
    parser.add_argument('--critical-latency', type=int, default=100, help='Critical level of latency in ms.')
    args = parser.parse_args()

    # Silence this error:
    """
    lib/python3.10/site-packages/numpy/core/fromnumeric.py:3464: RuntimeWarning: Mean of empty slice.
      return _methods._mean(a, axis=axis, dtype=dtype,
    lib/python3.10/site-packages/numpy/core/_methods.py:192: RuntimeWarning: invalid value encountered in scalar divide
      ret = ret.dtype.type(ret / rcount)
    """
    with warnings.catch_warnings():
        warnings.simplefilter("ignore", category=RuntimeWarning)
        speedtest_results = run_speedtest()

    upload_speed_state = get_state(speedtest_results['upload_speed'], args.warn_up, args.critical_up, operator='le')
    download_speed_state = get_state(speedtest_results['download_speed'], args.warn_down, args.critical_down, operator='le')
    latency_state = get_state(speedtest_results['latency'], args.warn_latency, args.critical_latency, operator='ge')
    exit_code = max(upload_speed_state, download_speed_state, latency_state)
    text_result = f"upload: {speedtest_results['upload_speed']:.1f} Mbps, download: {speedtest_results['download_speed']:.1f} Mbps, latency: {speedtest_results['latency']:.1f} ms, jitter: {speedtest_results['jitter']:.1f} ms"

    perfdata = {
        'upload': {
            'value': round(speedtest_results['upload_speed'] * 1e+6, 2),
            'warn': round(args.warn_up * 1e+6, 2),
            'crit': round(args.critical_up * 1e+6, 2),
            'min': 0,
            'unit': 'B'
        },
        'download': {
            'value': round(speedtest_results['download_speed'] * 1e+6, 2),
            'warn': round(args.warn_down * 1e+6, 2),
            'crit': round(args.critical_down * 1e+6, 2),
            'min': 0,
            'unit': 'B'
        },
        'latency_ms': {
            'value': round(speedtest_results['latency'], 2),
            'warn': round(args.warn_latency, 2),
            'crit': round(args.critical_latency, 2),
            'min': 0,
            'unit': 'ms'
        },
        'jitter_ms': {
            'value': round(speedtest_results['jitter'], 2),
            'min': 0,
            'unit': 'ms'
        }

    }

    print_icinga2_check_status(text_result, exit_code, perfdata)
    sys.exit(exit_code)


if __name__ == "__main__":
    try:
        main()
    except Exception as e:
        print(f'UNKNOWN: exception "{e}"')
        print(traceback.format_exc())
        sys.exit(nagios.UNKNOWN)