import type {Point as UnistPoint} from 'unist'

export {location} from './lib/index.js'

/**
 * Accessors for index.
 */
export interface Location {
  /**
   * Get the `offset` from a line/column based `Point` in the bound indices;
   * returns `undefined` when given out of bounds input.
   *
   * @param point
   *   Line/column based `Point`.
   * @returns
   *   Offset.
   */
  toOffset(point?: PointLike | null | undefined): number | undefined
  /**
   * Get the line/column based `Point` for `offset` in the bound indices;
   * returns `undefined` when given out of bounds input.
   *
   * @param offset
   *   Offset.
   * @returns
   *   `Point`.
   */
  toPoint(offset?: number | null | undefined): UnistPoint | undefined
}

/**
 * Point from `unist`, allowed as input.
 */
interface PointLike {
  /**
   * Column.
   */
  column?: number | null | undefined
  /**
   * Line.
   */
  line?: number | null | undefined
  /**
   * Offset.
   */
  offset?: number | null | undefined
}