/**
 * @typedef {import('unist').Position} Position
 * @typedef {import('unist').Node} Node
 * @typedef {Record<string, unknown> & {type: string, position?: PositionLike|undefined}} NodeLike
 * @typedef {import('unist').Point} Point
 *
 * @typedef {Partial<Point>} PointLike
 *
 * @typedef PositionLike
 * @property {PointLike} [start]
 * @property {PointLike} [end]
 */

export const pointStart = point('start')
export const pointEnd = point('end')

/**
 * Get the positional info of `node`.
 *
 * @param {NodeLike|Node} [node]
 * @returns {Position}
 */
export function position(node) {
  return {start: pointStart(node), end: pointEnd(node)}
}

/**
 * Get the positional info of `node`.
 *
 * @param {'start'|'end'} type
 */
function point(type) {
  return point

  /**
   * Get the positional info of `node`.
   *
   * @param {NodeLike|Node} [node]
   * @returns {Point}
   */
  function point(node) {
    const point = (node && node.position && node.position[type]) || {}

    return {
      line: point.line || null,
      column: point.column || null,
      offset: point.offset > -1 ? point.offset : null
    }
  }
}