/**
 * Internal dependencies
 */

import { normaliseFormats } from './normalise-formats';
import { create } from './create';

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

/**
 * Concats a pair of rich text values. Not that this mutates `a` and does NOT
 * normalise formats!
 *
 * @param {Object} a Value to mutate.
 * @param {Object} b Value to add read from.
 *
 * @return {Object} `a`, mutated.
 */
export function mergePair(a, b) {
  a.formats = a.formats.concat(b.formats);
  a.replacements = a.replacements.concat(b.replacements);
  a.text += b.text;
  return a;
}

/**
 * Combine all Rich Text values into one. This is similar to
 * `String.prototype.concat`.
 *
 * @param {...RichTextValue} values Objects to combine.
 *
 * @return {RichTextValue} A new value combining all given records.
 */
export function concat(...values) {
  return normaliseFormats(values.reduce(mergePair, create()));
}
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