/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et: */
/* 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";

const { Symbiont } = require("api-utils/content");
const { Trait } = require("api-utils/traits");

if (!require("api-utils/xul-app").isOneOf(["Firefox", "Thunderbird"])) {
  throw new Error([
    "The page-worker module currently supports only Firefox and Thunderbird. ",
    "In the future, we would like it to support other applications, however. ",
    "Please see https://bugzilla.mozilla.org/show_bug.cgi?id=546740 for more ",
    "information."
  ].join(""));
}

const Page = Trait.compose(
  Symbiont.resolve({
    constructor: '_initSymbiont'
  }),
  {
    _frame: Trait.required,
    _initFrame: Trait.required,
    postMessage: Symbiont.required,
    on: Symbiont.required,
    destroy: Symbiont.required,

    constructor: function Page(options) {
      options = options || {};

      this.contentURL = 'contentURL' in options ? options.contentURL
        : 'about:blank';
      if ('contentScriptWhen' in options)
        this.contentScriptWhen = options.contentScriptWhen;
      if ('contentScriptFile' in options)
        this.contentScriptFile = options.contentScriptFile;
      if ('contentScript' in options)
        this.contentScript = options.contentScript;
      if ('allow' in options)
        this.allow = options.allow;
      if ('onError' in options)
        this.on('error', options.onError);
      if ('onMessage' in options)
        this.on('message', options.onMessage);

      this.on('propertyChange', this._onChange.bind(this));

      this._initSymbiont();
    },
    
    _onChange: function _onChange(e) {
      if ('contentURL' in e && this._frame) {
        // Cleanup the worker before injecting the content script in the new
        // document
        this._workerCleanup();
        this._initFrame(this._frame);
      }
    }
  }
);
exports.Page = function(options) Page(options);
exports.Page.prototype = Page.prototype;
