/**
 * @typedef {import('unist').Node} Node
 * @typedef {import('unist').Parent} Parent
 * @typedef {import('unist-util-is').Test} Test
 * @typedef {import('unist-util-visit-parents').VisitorResult} VisitorResult
 * @typedef {import('./complex-types').Visitor} Visitor
 */

import {visitParents, CONTINUE, SKIP, EXIT} from 'unist-util-visit-parents'

export {CONTINUE, SKIP, EXIT}

/**
 * Visit children of tree which pass a test
 *
 * @param tree Abstract syntax tree to walk
 * @param test Test, optional
 * @param visitor Function to run for each node
 * @param reverse Fisit the tree in reverse, defaults to false
 */
export const visit =
  /**
   * @type {(
   *   (<Tree extends Node, Check extends Test>(tree: Tree, test: Check, visitor: import('./complex-types').BuildVisitor<Tree, Check>, reverse?: boolean) => void) &
   *   (<Tree extends Node>(tree: Tree, visitor: import('./complex-types').BuildVisitor<Tree>, reverse?: boolean) => void)
   * )}
   */
  (
    /**
     * @param {Node} tree
     * @param {Test} test
     * @param {import('./complex-types').Visitor} visitor
     * @param {boolean} [reverse]
     */
    function (tree, test, visitor, reverse) {
      if (typeof test === 'function' && typeof visitor !== 'function') {
        reverse = visitor
        visitor = test
        test = null
      }

      visitParents(tree, test, overload, reverse)

      /**
       * @param {Node} node
       * @param {Array.<Parent>} parents
       */
      function overload(node, parents) {
        const parent = parents[parents.length - 1]
        return visitor(
          node,
          parent ? parent.children.indexOf(node) : null,
          parent
        )
      }
    }
  )