'use strict';

/**
 * @typedef {import('unist').Node} Node
 * @typedef {import('unist').Point} Point
 * @typedef {import('unist').Position} Position
 */

/**
 * @typedef NodeLike
 * @property {string} type
 * @property {PositionLike | null | undefined} [position]
 *
 * @typedef PositionLike
 * @property {PointLike | null | undefined} [start]
 * @property {PointLike | null | undefined} [end]
 *
 * @typedef PointLike
 * @property {number | null | undefined} [line]
 * @property {number | null | undefined} [column]
 * @property {number | null | undefined} [offset]
 */

/**
 * Serialize the positional info of a point, position (start and end points),
 * or node.
 *
 * @param {Node | NodeLike | Position | PositionLike | Point | PointLike | null | undefined} [value]
 *   Node, position, or point.
 * @returns {string}
 *   Pretty printed positional info of a node (`string`).
 *
 *   In the format of a range `ls:cs-le:ce` (when given `node` or `position`)
 *   or a point `l:c` (when given `point`), where `l` stands for line, `c` for
 *   column, `s` for `start`, and `e` for end.
 *   An empty string (`''`) is returned if the given value is neither `node`,
 *   `position`, nor `point`.
 */
function stringifyPosition(value) {
  // Nothing.
  if (!value || typeof value !== 'object') {
    return ''
  }

  // Node.
  if ('position' in value || 'type' in value) {
    return position(value.position)
  }

  // Position.
  if ('start' in value || 'end' in value) {
    return position(value)
  }

  // Point.
  if ('line' in value || 'column' in value) {
    return point(value)
  }

  // ?
  return ''
}

/**
 * @param {Point | PointLike | null | undefined} point
 * @returns {string}
 */
function point(point) {
  return index(point && point.line) + ':' + index(point && point.column)
}

/**
 * @param {Position | PositionLike | null | undefined} pos
 * @returns {string}
 */
function position(pos) {
  return point(pos && pos.start) + '-' + point(pos && pos.end)
}

/**
 * @param {number | null | undefined} value
 * @returns {number}
 */
function index(value) {
  return value && typeof value === 'number' ? value : 1
}

exports.stringifyPosition = stringifyPosition;
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