#!/usr/bin/env node
/* -*- Mode:js */
/* vim: set expandtab ts=4 sw=4: */
/*
 * 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/>.
 */
var Cjdns = require('./lib/cjdnsadmin/cjdnsadmin');
var nThen = require('nthen');
var PublicToIP6 = require('./lib/publicToIp6');
var Dns =  require('dns');

var WAIT_TIME = 5000;
var INTERVAL = 1000;

var now = function () { return (new Date()).getTime(); };
var nowSeconds = function () { return Math.floor(now() / 1000); };

var IP6_REGEX = new RegExp('^' + new Array(9).join(':[0-9a-f]{1,4}').substring(1) + '$');

var equalsIp = function (ip, fullAddr) {
    var key = fullAddr.replace(/.*\.([^\.]*\.k)/, function (all, one) { return one; });
    return (PublicToIP6.convert(key) === ip);
};

var main = function (argv) {

    var count = -1;
    if (argv.indexOf('-c') !== -1) {
        count = Number(argv[argv.indexOf('-c')+1]);
    }

    var target = argv[argv.length-1];

    var cjdns;
    nThen(function (waitFor) {

        Cjdns.connectWithAdminInfo(waitFor(function (c) { cjdns = c; }));

        if (!IP6_REGEX.test(target)) {
            Dns.lookup(target, 6, waitFor(function (err, res) {
                if (err) { throw err; }
                console.log(target + ' has ip address ' + res);
                target = res;
            }));
        }

    }).nThen(function (waitFor) {

        // Cannonicalize the ipv6...
        var arr = target.split(':');
        for (var i = 0; i < arr.length; i++) {
            while (arr[i].length < 4) { arr[i] = '0' + arr[i]; }
        }
        target = arr.join(':');

    }).nThen(function (waitFor) {

        var startTime = (new Date()).getTime();
        var timeOfFirstFind;
        var handleMessage = function (err, msg) {
            if (err) { throw err; }
            if (msg.error && msg.error !== 'none') {
                cjdns.disconnect();
                console.log(msg);
            }
            if (msg.complete === "1") {
                cjdns.disconnect();
                console.log("Done -- first result in " + (timeOfFirstFind - startTime) + "ms." +
                            " total: " + ((new Date()).getTime() - startTime) + "ms.");
                return;
            }

            console.log();
            console.log(msg.from + ' ' + msg.ms + 'ms ' + msg.nodes.length + ' results');

            var addresses = [msg.from];
            addresses.push.apply(addresses, msg.nodes);
            for (var i = 0; i < addresses.length; i++) {
                if (equalsIp(target, addresses[i])) {
                    console.log("    found " + addresses[i]);
                    if (!timeOfFirstFind) { timeOfFirstFind = (new Date()).getTime(); }
                }
            }
        };

        cjdns.setDefaultHandler(handleMessage);
        cjdns.SearchRunner_search(target, count, handleMessage);
    });
};

main(process.argv);