/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";

if (!window.__firefox__) {
  Object.defineProperty(window, '__firefox__', {
    enumerable: false,
    configurable: false,
    writable: false,
    value: {}
  });
}

Object.defineProperty(window.__firefox__, 'searchQueryForField', {
  enumerable: false,
  configurable: false,
  writable: false,
  value: function() {
    var input = document.activeElement;
    if (input.tagName.toLowerCase() !== 'input') return null;
    var form = input.form;
    if (!form || form.method.toLowerCase() != 'get') return null;

    var inputs = form.getElementsByTagName('input');
    inputs = Array.prototype.slice.call(inputs, 0);
    var params = inputs.map(function(element) {
      if (element.name == input.name) return [element.name, '{searchTerms}'].join('=');
      return [element.name, element.value].map(encodeURIComponent).join('=');
    });

    var selectFields = form.getElementsByTagName('select');
    selectFields = Array.prototype.slice.call(selectFields, 0);
    var selectParams = selectFields.map(function(e){
      return [e.name, e.options[e.selectedIndex].value].map(encodeURIComponent).join('=');
    });
    params = params.concat(selectParams);
    if (!form.action) return null; //an invalid form.
    var url = [form.action, params.join('&')].join('?');
    return url;
  }
});