/**
 * Build lazy-image attributes for dynamically rendered AKSRT markup.
 * legacy owns the lazySizes runtime; this file only provides the shared bridge.
 */
(function (window) {
  'use strict';

  function escapeAttribute(value) {
    return String(value == null ? '' : value)
      .replace(/&/g, '&')
      .replace(/"/g, '"')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;');
  }

  window.aksrtGetLazyImageAttr = function (key, src, className, size) {
    var config = window.aksrtData || {};
    var scopes = config.lazyScopes || {};
    var classes = String(className || '').trim();
    var realSrc = escapeAttribute(src);

    if (!src || scopes[key] === false) {
      return ' class="' + escapeAttribute(classes) + '" src="' + realSrc + '"';
    }

    var thumbs = config.lazyThumbs || {};
    var placeholder = key === 'lazy_avatar'
      ? (config.lazyAvatar || thumbs.sm || '')
      : (thumbs[size || 'default'] || thumbs.default || '');

    return ' class="lazyload ' + escapeAttribute(classes) + '" src="' +
      escapeAttribute(placeholder) + '" data-src="' + realSrc + '"';
  };
})(window);