/**
 * WordPress dependencies
 */

import { escapeEditableHTML, escapeAttribute, isValidAttributeName } from '@wordpress/escape-html';

/**
 * Internal dependencies
 */

import { toTree } from './to-tree';

/** @typedef {import('./types').RichTextValue} RichTextValue */

/**
 * Create an HTML string from a Rich Text value.
 *
 * @param {Object}        $1                      Named argements.
 * @param {RichTextValue} $1.value                Rich text value.
 * @param {boolean}       [$1.preserveWhiteSpace] Preserves newlines if true.
 *
 * @return {string} HTML string.
 */
export function toHTMLString({
  value,
  preserveWhiteSpace
}) {
  const tree = toTree({
    value,
    preserveWhiteSpace,
    createEmpty,
    append,
    getLastChild,
    getParent,
    isText,
    getText,
    remove,
    appendText
  });
  return createChildrenHTML(tree.children);
}
function createEmpty() {
  return {};
}
function getLastChild({
  children
}) {
  return children && children[children.length - 1];
}
function append(parent, object) {
  if (typeof object === 'string') {
    object = {
      text: object
    };
  }
  object.parent = parent;
  parent.children = parent.children || [];
  parent.children.push(object);
  return object;
}
function appendText(object, text) {
  object.text += text;
}
function getParent({
  parent
}) {
  return parent;
}
function isText({
  text
}) {
  return typeof text === 'string';
}
function getText({
  text
}) {
  return text;
}
function remove(object) {
  const index = object.parent.children.indexOf(object);
  if (index !== -1) {
    object.parent.children.splice(index, 1);
  }
  return object;
}
function createElementHTML({
  type,
  attributes,
  object,
  children
}) {
  let attributeString = '';
  for (const key in attributes) {
    if (!isValidAttributeName(key)) {
      continue;
    }
    attributeString += ` ${key}="${escapeAttribute(attributes[key])}"`;
  }
  if (object) {
    return `<${type}${attributeString}>`;
  }
  return `<${type}${attributeString}>${createChildrenHTML(children)}</${type}>`;
}
function createChildrenHTML(children = []) {
  return children.map(child => {
    if (child.html !== undefined) {
      return child.html;
    }
    return child.text === undefined ? createElementHTML(child) : escapeEditableHTML(child.text);
  }).join('');
}
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