'use strict';

const { detachNodeFromParent } = require('../lib/xast.js');
const { editorNamespaces } = require('./_collections.js');

exports.type = 'visitor';
exports.name = 'removeEditorsNSData';
exports.active = true;
exports.description = 'removes editors namespaces, elements and attributes';

/**
 * Remove editors namespaces, elements and attributes.
 *
 * @example
 * <svg xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd">
 * <sodipodi:namedview/>
 * <path sodipodi:nodetypes="cccc"/>
 *
 * @author Kir Belevich
 *
 * @type {import('../lib/types').Plugin<{
 *   additionalNamespaces?: Array<string>
 * }>}
 */
exports.fn = (_root, params) => {
  let namespaces = editorNamespaces;
  if (Array.isArray(params.additionalNamespaces)) {
    namespaces = [...editorNamespaces, ...params.additionalNamespaces];
  }
  /**
   * @type {Array<string>}
   */
  const prefixes = [];
  return {
    element: {
      enter: (node, parentNode) => {
        // collect namespace aliases from svg element
        if (node.name === 'svg') {
          for (const [name, value] of Object.entries(node.attributes)) {
            if (name.startsWith('xmlns:') && namespaces.includes(value)) {
              prefixes.push(name.slice('xmlns:'.length));
              // <svg xmlns:sodipodi="">
              delete node.attributes[name];
            }
          }
        }
        // remove editor attributes, for example
        // <* sodipodi:*="">
        for (const name of Object.keys(node.attributes)) {
          if (name.includes(':')) {
            const [prefix] = name.split(':');
            if (prefixes.includes(prefix)) {
              delete node.attributes[name];
            }
          }
        }
        // remove editor elements, for example
        // <sodipodi:*>
        if (node.name.includes(':')) {
          const [prefix] = node.name.split(':');
          if (prefixes.includes(prefix)) {
            detachNodeFromParent(node, parentNode);
          }
        }
      },
    },
  };
};