import httplib
import hashlib
import json
import argparse
import socket
import urllib
import ConfigParser
import os
import sys

parent_dir = os.path.abspath(os.path.dirname(__file__))
vendor_dir = os.path.join(parent_dir, 'vendor')

sys.path.append(vendor_dir)

from netaddr import IPNetwork


class KeeneticAPI:
    def __init__(self, destination="192.168.1.1"):
        self._conn = httplib.HTTPConnection(destination)
        self._cookie = ""
        pass

    def _get(self, url):
        headers = {"Cookie": self._cookie}
        self._conn.request("GET", url, "", headers)
        res = self._conn.getresponse()
        data = res.read()
        return res, data

    def _post(self, url, body):
        headers = {"Content-type": "application/json", "Cookie": self._cookie}
        self._conn.request("POST", url, body, headers)
        res = self._conn.getresponse()
        data = res.read()
        return res, data

    def _delete(self, url):
        headers = {"Cookie": self._cookie}
        self._conn.request("DELETE", url, "", headers)
        res = self._conn.getresponse()
        data = res.read()
        return res, data

    def auth(self, login, passw):
        res, _ = self._get("/auth")
        self._cookie = res.getheader("Set-Cookie")

        if res.status == 401:
            md5 = login + ":" + res.getheader("X-NDM-Realm") + ":" + passw
            md5 = hashlib.md5(md5.encode('utf-8'))
            sha = res.getheader("X-NDM-Challenge") + md5.hexdigest()
            sha = hashlib.sha256(sha.encode('utf-8'))

            self._post("/auth", json.dumps({"login": login, "password": sha.hexdigest()}))

    def get_ip_route(self):
        res, data = self._get("/rci/ip/route")
        return json.loads(data)

    def set_ip_route(self, route_data):
        res, data = self._post("/rci/ip/route", json.dumps(route_data))
        return res.status == 200

    def remove_ip_route(self, route):
        res, _ = self._delete("/rci/ip/route?" + urllib.urlencode(route))
        return res.status == 200

    def get_interfaces(self):
        res, data = self._get("/rci/show/interface")
        return json.loads(data, encoding='utf-8')

    def set_ip_routes(self, routes):
        res, _ = self._post("/rci/ip/route", json.dumps(routes))
        return res.status == 200


def interfaces(args):
    config = ConfigParser.ConfigParser()
    config.read(args.config_file)
    api = KeeneticAPI()
    api.auth(
        config.get('auth', 'login'),
        config.get('auth', 'password')
    )
    ifaces = api.get_interfaces()

    max_len = 0

    for iface in ifaces:
        max_len = max(len(iface), max_len)
        max_len = max(len(ifaces[iface].get('description') or '-'), max_len)

    print "{:^{width}} {:^{width}}".format("ID", "DESCRIPTION", width=max_len)

    for iface in ifaces:
        print "{:^{width}} {:^{width}}".format(iface, (ifaces[iface].get('description') or '-'), width=max_len)

def start(args):
    config = ConfigParser.ConfigParser()
    config.read(args.config_file)

    api = KeeneticAPI()
    api.auth(
        config.get('auth', 'login'),
        config.get('auth', 'password')
    )
    old_routes = api.get_ip_route()

    def filter_old_routes(item):
        return item['comment'].startswith('[A]')

    old_routes = list(filter(filter_old_routes, old_routes))

    for route in old_routes:
        api.remove_ip_route(route)

    routes_dir = os.path.abspath(config.get('app', 'dir'))

    routes = list()

    for filename in os.listdir(routes_dir):
        fp = os.path.join(routes_dir, filename)

        if not os.path.isfile(fp):
            continue

        interface_name = os.path.splitext(filename)[0]

        data = list()

        with open(fp) as f:
            comment = ''
            lst = list()
            for line in f:
                ln = line.strip()
                if ln == '':
                    continue
                if ln.startswith('#'):
                    if len(lst) > 0:
                        data.append(
                            (lst, comment)
                        )

                    comment = ln.lstrip('# ')
                    lst = list()
                else:
                    lst.append(ln)

            if len(lst) > 0:
                data.append(
                    (lst, comment)
                )

        for group in data:
            hosts, description = group
            for host in hosts:
                if not host[0].isdigit():
                    ipnet = socket.gethostbyname(host)
                else:
                    ipnet = host

                ipnetwork = IPNetwork(ipnet)

                routes.append(
                    {
                        'network': str(ipnetwork.network),
                        'mask': str(ipnetwork.netmask),
                        'interface': interface_name,
                        'auto': True,
                        'comment': '[A] {}'.format(description)
                    }
                )

    api = KeeneticAPI()
    api.auth(
        config.get('auth', 'login'),
        config.get('auth', 'password')
    )
    api.set_ip_routes(routes)



def main():
    parser = argparse.ArgumentParser(description="a script to do stuff")
    parser.add_argument("--config-file", default="app.cfg")
    subparsers = parser.add_subparsers()

    parser_interfaces = subparsers.add_parser('interfaces')
    parser_interfaces.set_defaults(func=interfaces)

    parser_start = subparsers.add_parser('start')
    parser_start.set_defaults(func=start)

    args = parser.parse_args()
    args.func(args)


if __name__ == "__main__":
    main()