/*
 * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */

(function(scope) {

  function withDependencies(task, depends) {
    depends = depends || [];
    if (!depends.map) {
      depends = [depends];
    }
    return task.apply(this, depends.map(marshal));
  }

  function module(name, dependsOrFactory, moduleFactory) {
    var module;
    switch (arguments.length) {
      case 0:
        return;
      case 1:
        module = null;
        break;
      case 2:
        // dependsOrFactory is `factory` in this case
        module = dependsOrFactory.apply(this);
        break;
      default:
        // dependsOrFactory is `depends` in this case
        module = withDependencies(moduleFactory, dependsOrFactory);
        break;
    }
    modules[name] = module;
  };

  function marshal(name) {
    return modules[name];
  }

  var modules = {};

  function using(depends, task) {
    HTMLImports.whenImportsReady(function() {
      withDependencies(task, depends);
    });
  };

  // exports

  scope.marshal = marshal;
  // `module` confuses commonjs detectors
  scope.modularize = module;
  scope.using = using;

})(window);