(function ($) {
namespace('Drupal.media.browser');

Drupal.media.browser.selectedMedia = [];
Drupal.media.browser.mediaAdded = function () {};
Drupal.media.browser.selectionFinalized = function (selectedMedia) {
  // This is intended to be overridden if a callee wants to be triggered
  // when the media selection is finalized from inside the browser.
  // This is used for the file upload form for instance.
};

Drupal.behaviors.experimentalMediaBrowser = {
  attach: function (context) {
    if (Drupal.settings.media.selectedMedia) {
      Drupal.media.browser.selectMedia(Drupal.settings.media.selectedMedia);
      // Fire a confirmation of some sort.
      Drupal.media.browser.finalizeSelection();
    }
    $('#media-browser-tabset').tabs({
      show: Drupal.media.browser.resizeIframe
    });

    $('.media-browser-tab').each( Drupal.media.browser.validateButtons );

  }
  // Wait for additional params to be passed in.
};

Drupal.media.browser.launch = function () {

};

Drupal.media.browser.validateButtons = function() {
  // The media browser runs in an IFRAME. The Drupal.media.popups.mediaBrowser()
  // function sets up the IFRAME and "OK" and "Cancel" buttons that are outside
  // of the IFRAME, so that their click handlers can destroy the IFRAME while
  // retaining information about what media items were selected. However,
  // Drupal UI convention is to place all action buttons on the same "line"
  // at the bottom of the form, so if the form within the IFRAME contains a
  // "Submit" button or other action buttons, then the "OK" and "Cancel"
  // buttons below the IFRAME break this convention and confuse the user.
  // Therefore, we add "Submit" and "Cancel" buttons inside the IFRAME, and
  // have their click action trigger the click action of the corresonding
  // "OK" and "Cancel" buttons that are outside the IFRAME. media.css contains
  // CSS rules that hide the outside buttons.
  //
  // We don't add a "Submit" button if the form already has one, since in these
  // cases, another round-trip to the server is needed before the user's
  // selection is finalized. For these cases, when the form's real Submit
  // button is clicked, the server either returns another form for the user to
  // fill out, or else a completion page that contains or sets the
  // Drupal.media.browser.selectedMedia variable. If the latter, then
  // Drupal.media.popups.mediaBrowser.mediaBrowserOnLoad() auto-triggers the
  // "OK" button action to finalize the selection and remove the IFRAME.
  //
  // @todo An alternate, less hacky solution would be most welcome.
  if (!($('.form-submit', this).length > 0)) {
    $('<a class="button button-yes fake-ok">' + Drupal.t('Submit') + '</a>').appendTo(this).bind('click', Drupal.media.browser.submit);
    if (!($('.fake-cancel', this).length > 0)) {
      $('<a class="button button-no fake-cancel">' + Drupal.t('Cancel') + '</a>').appendTo(this).bind('click', Drupal.media.browser.submit);
    }
  } else if (!($('.fake-cancel', this).length > 0)) {
    var parent = $('.form-actions', this);
    if (!parent.length) {
      parent = $('form > div', this);
    }
    $('<a class="button button-no fake-cancel">' + Drupal.t('Cancel') + '</a>').appendTo(parent).bind('click', Drupal.media.browser.submit);
  }
};

Drupal.media.browser.submit = function () {
  // @see Drupal.media.browser.validateButtons().
  var buttons = $(parent.window.document.body).find('#mediaBrowser').parent('.ui-dialog').find('.ui-dialog-buttonpane button');
  if ($(this).hasClass('fake-cancel')) {
    buttons[1].click();
  } else {
    buttons[0].click();
  }
}

Drupal.media.browser.selectMedia = function (selectedMedia) {
  Drupal.media.browser.selectedMedia = selectedMedia;
};

Drupal.media.browser.finalizeSelection = function () {
  if (!Drupal.media.browser.selectedMedia) {
    throw new exception(Drupal.t('Cannot continue, nothing selected'));
  }
  else {
    Drupal.media.browser.selectionFinalized(Drupal.media.browser.selectedMedia);
  }
};

Drupal.media.browser.resizeIframe = function (event) {
  var h = $('body').height();
  $(parent.window.document).find('#mediaBrowser').height(h);
};

}(jQuery));