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

/**
 * Slice a Rich Text value from `startIndex` to `endIndex`. Indices are
 * retrieved from the selection if none are provided. This is similar to
 * `String.prototype.slice`.
 *
 * @param {RichTextValue} value        Value to modify.
 * @param {number}        [startIndex] Start index.
 * @param {number}        [endIndex]   End index.
 *
 * @return {RichTextValue} A new extracted value.
 */
export function slice(value, startIndex = value.start, endIndex = value.end) {
  const {
    formats,
    replacements,
    text
  } = value;
  if (startIndex === undefined || endIndex === undefined) {
    return {
      ...value
    };
  }
  return {
    formats: formats.slice(startIndex, endIndex),
    replacements: replacements.slice(startIndex, endIndex),
    text: text.slice(startIndex, endIndex)
  };
}
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