/*
 * Copyright 2014, Gregg Tavares.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Gregg Tavares. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */
"use strict";

/**
 * @module
 */

/**
 * Gets the ip address of this machine.
 * @returns {String[]} array of ip addresses.
 */
var getIpAddress = (function() {

  var addresses;

  return function() {
    if (!addresses) {
      var os = require('os')

      var interfaces = os.networkInterfaces();
      var addresses = [];
      for (var k in interfaces) {
        for (var k2 in interfaces[k]) {
          var address = interfaces[k][k2];
          if (address.family == 'IPv4' && !address.internal) {
            addresses.push(address.address)
          }
        }
      }
    }

    return addresses;
  };
}());

exports.getIpAddress = getIpAddress;


/*
 * Copyright 2014, Gregg Tavares.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Gregg Tavares. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */
"use strict";

/**
 * @module
 */

/**
 * Gets the ip address of this machine.
 * @returns {String[]} array of ip addresses.
 */
var getIpAddress = (function() {
  // Premature optimization. Don't read this more than once a second
  var cacheTime = 1 * 1000;  // 1 second
  var lastRead = Date.now();
  var addresses;

  var os = require('os');

  return function() {

    var now = Date.now();
    if (!addresses || now - lastRead > cacheTime) {
      lastRead = now;
      var interfaces = os.networkInterfaces();
      addresses = [];
      for (var k in interfaces) {
        for (var k2 in interfaces[k]) {
          var address = interfaces[k][k2];
          if (address.family == 'IPv4' && !address.internal) {
            addresses.push(address.address)
          }
        }
      }
    }
    return addresses;
  };
}());

var getOneIpAddress = function() {
  var address;
  var addresses = getIpAddress();

  if (addresses.length < 1) {
    console.error("No IP address found!!!");
  } else {
    address = addresses[0];
    if (addresses.length > 1) {
      console.log("more than 1 IP address found: " + addresses);
    }
  }
  return address;
};

exports.getIpAddress = getIpAddress;
exports.getOneIpAddress = getOneIpAddress;


make getIPaddress get new address at most once a second