const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;

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

const kCountBeforeWeRemember = 5;

function setPagePermission(type, uri, allow) {
  let pm = Services.perms;
  let contentPrefs = Services.contentPrefs;
  let contentPrefName = type + ".request.remember";

  if (!contentPrefs.hasPref(uri, contentPrefName))
      contentPrefs.setPref(uri, contentPrefName, 0);

  let count = contentPrefs.getPref(uri, contentPrefName);

  if (allow == false)
    count--;
  else
    count++;
    
  contentPrefs.setPref(uri, contentPrefName, count);
  if (count == kCountBeforeWeRemember)
    pm.add(uri, type, Ci.nsIPermissionManager.ALLOW_ACTION);
  else if (count == -kCountBeforeWeRemember)
    pm.add(uri, type, Ci.nsIPermissionManager.DENY_ACTION);
}

function ContentPermissionPrompt() {}

ContentPermissionPrompt.prototype = {
  classID: Components.ID("{C6E8C44D-9F39-4AF7-BCC0-76E38A8310F5}"),

  QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentPermissionPrompt]),

  getChromeWindow: function getChromeWindow(aWindow) {
     let chromeWin = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIWebNavigation)
                            .QueryInterface(Ci.nsIDocShellTreeItem)
                            .rootTreeItem
                            .QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindow)
                            .QueryInterface(Ci.nsIDOMChromeWindow);
     return chromeWin;
  },

  getNotificationBoxForRequest: function getNotificationBoxForRequest(request) {
    let notificationBox = null;
    if (request.window) {
      let requestingWindow = request.window.top;
      let chromeWin = this.getChromeWindow(requestingWindow).wrappedJSObject;
      return chromeWin.getNotificationBox(requestingWindow);
    }

    let chromeWin = request.element.ownerDocument.defaultView;
    return chromeWin.Browser.getNotificationBox();
  },

  handleExistingPermission: function handleExistingPermission(request) {
    let result = Services.perms.testExactPermission(request.uri, request.type);
    if (result == Ci.nsIPermissionManager.ALLOW_ACTION) {
      request.allow();
      return true;
    }
    if (result == Ci.nsIPermissionManager.DENY_ACTION) {
      request.cancel();
      return true;
    }
    return false;
  },

  prompt: function(request) {
    // returns true if the request was handled
    if (this.handleExistingPermission(request))
       return;

    let pm = Services.perms;
    let notificationBox = this.getNotificationBoxForRequest(request);
    let browserBundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
    
    let notification = notificationBox.getNotificationWithValue(request.type);
    if (notification)
      return;

    let buttons = [{
      label: browserBundle.GetStringFromName(request.type + ".allow"),
      accessKey: null,
      callback: function(notification) {
                setPagePermission(request.type, request.uri, true);
                request.allow();},
    },
    {
      label: browserBundle.GetStringFromName(request.type + ".dontAllow"),
      accessKey: null,
      callback: function(notification) {
            setPagePermission(request.type, request.uri, false);
            request.cancel();},
    }];

    let message = browserBundle.formatStringFromName(request.type + ".siteWantsTo",
                                                     [request.uri.host], 1);
    let newBar = notificationBox.appendNotification(message,
                                                    request.type,
                                                    "", // Notifications in Fennec do not display images.
                                                    notificationBox.PRIORITY_WARNING_MEDIUM,
                                                    buttons);
    return;
  },

};


//module initialization
const NSGetFactory = XPCOMUtils.generateNSGetFactory([ContentPermissionPrompt]);