//-- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2017 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
//++

/**
 * Listen to failed avatar load requests and replace them with the default icon
 */
// We can employ useCapture to avoid binding to every image#error event
window.addEventListener('error', (evt) => {
  const target = evt.target as HTMLElement;

  // Replace if we hit a gravatar image
  if (!(target.tagName === 'IMG' && target.classList.contains('avatar--fallback'))) {
    return;
  }

  // We need to replace all gravatars with the same source since the error event
  // is fired only once
  const src = (target as HTMLImageElement).src;
  const targets = document.querySelectorAll(`img.avatar--fallback[src="${src}"]`)

  for (var i = 0, l = targets.length;  i < l; i++) {
    const target = targets[i] as HTMLElement;
    const parent = target.parentElement;

    if (target.dataset.avatarFallbackRemove) {
      parent && parent.removeChild(target);
      continue;
    }

    const classes = target.dataset.avatarFallbackIcon || 'icon icon-user avatar';

    const replacement = document.createElement('i');
    replacement.classList.add(...classes.split(/\s+/));
    replacement.setAttribute('aria-hidden', 'true');

    parent && parent.replaceChild(replacement, target);
  }
}, true);