#!/usr/local/bin/python3
#
# Copyright (c) 2017-2020  Joe Clarke <jclarke@cisco.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

from __future__ import print_function
import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
import json
import sys
import time
import os
from subprocess import Popen, PIPE, run
import shlex
from sparker import Sparker
import pprint
import re
import socket
import CLEUCreds
from cleu.config import Config as C

CACHE_FILE = "/home/jclarke/monitored_devs.json"


def get_devs():

    url = "http://{}/get/switches/json".format(C.TOOL)

    devs = []
    response = requests.request("GET", url)
    code = 200
    code = response.status_code
    if code == 200:
        j = response.json()

        for dev in j:
            if dev["IPAddress"] == "0.0.0.0" or not dev["Reachable"]:
                continue
            if not re.search(r"^0", dev["Hostname"]):
                continue
            if (
                re.search(r".*CORE.*", dev["Hostname"], flags=re.I)
                or re.search(r".*MDF.*", dev["Hostname"], flags=re.I)
                or re.search(r"-x\d{2}-", dev["Hostname"], flags=re.I)
            ):
                continue

            devs.append(dev)

    return devs


def delete_device(dev):

    res = run(shlex.split("ssh -2 {} /usr/local/www/librenms/delhost.php {}".format(C.MONITORING, dev)), capture_output=True)

    return res


if __name__ == "__main__":
    devs = {}
    force = False
    changed_devs = False

    if len(sys.argv) == 2:
        if sys.argv[1] == "-f":
            force = True
    try:
        fd = open(CACHE_FILE, "r")
        devs = json.load(fd)
        fd.close()
    except Exception as e:
        print("Failed to open {}: {}".format(CACHE_FILE, e))

    tdevs = get_devs()

    i = 0
    for tdev in tdevs:
        i += 1
        if tdev["AssetTag"] in list(devs.keys()) and devs[tdev["AssetTag"]] != tdev["Hostname"]:
            print("=== Deleting device {} from LibreNMS ({} / {}) ===".format(tdev["Hostname"], i, len(tdevs)))
            res = delete_device(devs[tdev["AssetTag"]])
            if res.returncode != 0:
                print(
                    "\n\n***WARNING: Failed to remove LibreNMS device for {}: out='{}', err='{}'".format(
                        devs[tdev["AssetTag"]], res.stdout.decode("utf-8").strip(), res.stderr.decode("utf-8").strip()
                    )
                )
            print("=== DONE. ===")
            changed_devs = True
            del devs[tdev["AssetTag"]]
            time.sleep(3)

        if tdev["AssetTag"] not in list(devs.keys()) or force:
            if force:
                print("=== Deleting device {} from LibreNMS ({} / {}) ===".format(tdev["Hostname"], i, len(tdevs)))
                res = delete_device(tdev["Hostname"])
                if res.returncode != 0:
                    print(
                        "\n\n***WARNING: Failed to remove LibreNMS device {}: out='{}', err='{}'".format(
                            tdev["Hostname"], res.stdout.decode("utf-8").strip(), res.stderr.decode("utf-8").strip()
                        )
                    )
                print("=== DONE. ===")
                time.sleep(3)

            url = "https://librenms." + C.DNS_DOMAIN + "/api/v0/inventory/" + tdev["Hostname"]
            try:
                response = requests.request("GET", url, headers={"X-Auth-Token": CLEUCreds.LIBRENMS_TOKEN}, verify=False)
                response.raise_for_status()
                devs[tdev["AssetTag"]] = tdev["Hostname"]
                changed_devs = True
                continue
            except Exception as e:
                if not response or response.status_code != 400:
                    text = ""
                    if response:
                        text = response.text
                    print("Error retrieving device status from LibreNMS: {}".format(response.text))

            print("=== Adding device {} to LibreNMS ({} / {}) ===".format(tdev["Hostname"], i, len(tdevs)))
            res = run(
                shlex.split(
                    "ssh -2 {} /usr/local/www/librenms/addhost.php {} ap v3 CLEUR {} {} sha des".format(
                        C.MONITORING, tdev["Hostname"], CLEUCreds.SNMP_AUTH_PASS, CLEUCreds.SNMP_PRIV_PASS
                    )
                ),
                capture_output=True,
            )
            if res.returncode != 0:
                print(
                    "\n\n***ERROR: Failed to add {} to LibreNMS: out='{}', err='{}'".format(
                        tdev["Hostname"], res.stdout.decode("utf-8").strip(), res.stderr.decode("utf-8").strip()
                    )
                )
                continue
            print("=== DONE. ===")

            changed_devs = True
            devs[tdev["AssetTag"]] = tdev["Hostname"]

    if changed_devs:
        fd = open(CACHE_FILE, "w")
        json.dump(devs, fd)
        fd.close()