/**
 * Internal dependencies
 */

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

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

/**
 * Insert a Rich Text value, an HTML string, or a plain text string, into a
 * Rich Text value at the given `startIndex`. Any content between `startIndex`
 * and `endIndex` will be removed. Indices are retrieved from the selection if
 * none are provided.
 *
 * @param {RichTextValue}        value         Value to modify.
 * @param {RichTextValue|string} valueToInsert Value to insert.
 * @param {number}               [startIndex]  Start index.
 * @param {number}               [endIndex]    End index.
 *
 * @return {RichTextValue} A new value with the value inserted.
 */
export function insert(value, valueToInsert, startIndex = value.start, endIndex = value.end) {
  const {
    formats,
    replacements,
    text
  } = value;
  if (typeof valueToInsert === 'string') {
    valueToInsert = create({
      text: valueToInsert
    });
  }
  const index = startIndex + valueToInsert.text.length;
  return normaliseFormats({
    formats: formats.slice(0, startIndex).concat(valueToInsert.formats, formats.slice(endIndex)),
    replacements: replacements.slice(0, startIndex).concat(valueToInsert.replacements, replacements.slice(endIndex)),
    text: text.slice(0, startIndex) + valueToInsert.text + text.slice(endIndex),
    start: index,
    end: index
  });
}
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