/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2014 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* jshint esnext:true */
/* globals Components, Services, XPCOMUtils, PdfjsContentUtils,
           PdfjsContentUtils, PdfStreamConverter, addMessageListener */

'use strict';

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cm = Components.manager;
const Cu = Components.utils;
const Cr = Components.results;

Cu.import('resource://gre/modules/XPCOMUtils.jsm');
Cu.import('resource://gre/modules/Services.jsm');

var isRemote = Services.appinfo.processType ===
               Services.appinfo.PROCESS_TYPE_CONTENT;

// Factory that registers/unregisters a constructor as a component.
function Factory() {}

Factory.prototype = {
  QueryInterface: XPCOMUtils.generateQI([Ci.nsIFactory]),
  _targetConstructor: null,

  register: function register(targetConstructor) {
    this._targetConstructor = targetConstructor;
    var proto = targetConstructor.prototype;
    var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
    registrar.registerFactory(proto.classID, proto.classDescription,
      proto.contractID, this);
  },

  unregister: function unregister() {
    var proto = this._targetConstructor.prototype;
    var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
    registrar.unregisterFactory(proto.classID, this);
    this._targetConstructor = null;
  },

  // nsIFactory
  createInstance: function createInstance(aOuter, iid) {
    if (aOuter !== null) {
      throw Cr.NS_ERROR_NO_AGGREGATION;
    }
    return (new (this._targetConstructor)()).QueryInterface(iid);
  },

  // nsIFactory
  lockFactory: function lockFactory(lock) {
    // No longer used as of gecko 1.7.
    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
  }
};

var pdfStreamConverterFactory = new Factory();

function startup() {
  Cu.import('resource://pdf.js/PdfjsContentUtils.jsm');
  PdfjsContentUtils.init();

  Cu.import('resource://pdf.js/PdfStreamConverter.jsm');
  pdfStreamConverterFactory.register(PdfStreamConverter);
}

function shutdown() {
  // Remove the contract/component.
  pdfStreamConverterFactory.unregister();
  // Unload the converter
  Cu.unload('resource://pdf.js/PdfStreamConverter.jsm');

  PdfjsContentUtils.uninit();
  Cu.unload('resource://pdf.js/PdfjsContentUtils.jsm');
}

if (isRemote) {
  startup();

  addMessageListener('PDFJS:Child:shutdown', function (e) {
    shutdown();
  });
}