#!/usr/bin/env python2
# You may redistribute this program and/or modify it under the terms of
# the GNU General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import sys;
import math;
from cjdnsadmin.cjdnsadmin import connectWithAdminInfo;

cjdns = connectWithAdminInfo();
allRoutes = [];

def parseRoute(path):
    if (path == 0): return [-1];
    if ((path & 15) == 1): return [1];
    if (path & 1):
        path >>= 1;
        out = [(path & 7)];
        if out[0] == 1: out[0] = 0;
        path >>= 3;
    elif ((path & 3) == 2):
        path >>= 2;
        out = [(path & 31)];
        if out[0] != 0: out[0]+=1;
        path >>= 5;
    else:
        path >>= 2;
        out = [(path & 255)];
        if out[0] != 0: out[0]+=1;
        path >>= 8;

    out.extend(parseRoute(path));
    return out;


i = 0;
while True:
    table = cjdns.NodeStore_dumpTable(i);
    routes = table['routingTable'];
    allRoutes += routes;
    if (not 'more' in table):
        break;
    i += 1;

# get the value of a route as cjdns sees it
def getValue(node):
    if (node['link'] == 0): return 0
    return 64 - int(math.log(int(node['path'].replace(".", ""), 16), 2));

# get only the routes which will actually be user
ar = {};
for route in allRoutes:
    if route['ip'] not in ar or getValue(route) > getValue(ar[route['ip']]):
        ar[route['ip']] = route;
allRoutes = [];
for k in ar.keys():
    allRoutes.append(ar[k]);


# get the actual arrays of interface indexes representing the path
for route in allRoutes:
    path = int(route['path'].replace(".", ""), 16);
    route['r'] = parseRoute(path);



penaltySum = 0;
lengthSum = 0;


for route in allRoutes:
    r = route['r'];
    penalty = 0;
    for i in range(1,len(r)):
        penalize = True;
        for routeB in allRoutes:
            rb = routeB['r'];
            if len(rb) < i or rb == r: continue;
            for j in range(0,i+1):
                if (rb[j] != r[j]): break;
                if (j == i): penalize = False;
            if not penalize: break;
        if penalize: penalty += 1;
        penalty <<= 1;

    output = str(penalty) + '\t' + route['ip'] + '@' + route['path'] + '  ' + str(r);
    if (r[-1] == -1): output += ' INVALID';
    print(output);
    penaltySum += penalty;
    lengthSum += len(r);

avgPenalty = float(penaltySum) / len(allRoutes);
avgLength = float(lengthSum) / len(allRoutes);
print("average penalty " + str(avgPenalty));
print("average length " + str(avgLength));
print("trashroute index " + str(avgPenalty / avgLength));