/*!
   * Copyright (c) 2015, Salesforce.com, Inc.
   * 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.
   *
   * 3. Neither the name of Salesforce.com 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 HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  "use strict";
  var pubsuffix = require('./pubsuffix');
  
  // Gives the permutation of all possible domainMatch()es of a given domain. The
  // array is in shortest-to-longest order.  Handy for indexing.
  function permuteDomain (domain) {
    var pubSuf = pubsuffix.getPublicSuffix(domain);
    if (!pubSuf) {
      return null;
    }
    if (pubSuf == domain) {
      return [domain];
    }
  
    var prefix = domain.slice(0, -(pubSuf.length + 1)); // ".example.com"
    var parts = prefix.split('.').reverse();
    var cur = pubSuf;
    var permutations = [cur];
    while (parts.length) {
      cur = parts.shift() + '.' + cur;
      permutations.push(cur);
    }
    return permutations;
  }
  
  exports.permuteDomain = permuteDomain;