/* 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";

var OfflineApps = {
  offlineAppRequested: function(aContentWindow) {
    if (!Services.prefs.getBoolPref("browser.offline-apps.notify"))
      return;

    let tab = BrowserApp.getTabForWindow(aContentWindow);
    let currentURI = aContentWindow.document.documentURIObject;

    // Don't bother showing UI if the user has already made a decision
    if (Services.perms.testExactPermission(currentURI, "offline-app") != Services.perms.UNKNOWN_ACTION)
      return;

    try {
      if (Services.prefs.getBoolPref("offline-apps.allow_by_default")) {
        // All pages can use offline capabilities, no need to ask the user
        return;
      }
    } catch(e) {
      // This pref isn't set by default, ignore failures
    }

    let host = currentURI.asciiHost;
    let notificationID = "offline-app-requested-" + host;

    let strings = Strings.browser;
    let buttons = [{
      label: strings.GetStringFromName("offlineApps.dontAllow2"),
      callback: function(aChecked) {
        if (aChecked)
          OfflineApps.disallowSite(aContentWindow.document);
      }
    },
    {
      label: strings.GetStringFromName("offlineApps.allow"),
      callback: function() {
        OfflineApps.allowSite(aContentWindow.document);
      },
      positive: true
    }];

    let requestor = BrowserApp.manifest ? "'" + BrowserApp.manifest.name + "'" : host;
    let message = strings.formatStringFromName("offlineApps.ask", [requestor], 1);
    let options = { checkbox: Strings.browser.GetStringFromName("offlineApps.dontAskAgain") };
    NativeWindow.doorhanger.show(message, notificationID, buttons, tab.id, options);
  },

  allowSite: function(aDocument) {
    Services.perms.add(aDocument.documentURIObject, "offline-app", Services.perms.ALLOW_ACTION);

    // When a site is enabled while loading, manifest resources will
    // start fetching immediately.  This one time we need to do it
    // ourselves.
    this._startFetching(aDocument);
  },

  disallowSite: function(aDocument) {
    Services.perms.add(aDocument.documentURIObject, "offline-app", Services.perms.DENY_ACTION);
  },

  _startFetching: function(aDocument) {
    if (!aDocument.documentElement)
      return;

    let manifest = aDocument.documentElement.getAttribute("manifest");
    if (!manifest)
      return;

    let manifestURI = Services.io.newURI(manifest, aDocument.characterSet, aDocument.documentURIObject);
    let updateService = Cc["@mozilla.org/offlinecacheupdate-service;1"].getService(Ci.nsIOfflineCacheUpdateService);
    updateService.scheduleUpdate(manifestURI, aDocument.documentURIObject, aDocument.nodePrincipal, window);
  }
};