'use strict'

var mdast2hast = require('mdast-util-to-hast')

module.exports = remark2rehype

// Attacher.
// If a destination is given, runs the destination with the new hast tree
// (bridge mode).
// Without destination, returns the tree: further plugins run on that tree
// (mutate mode).
function remark2rehype(destination, options) {
  if (destination && !destination.process) {
    options = destination
    destination = null
  }

  return destination ? bridge(destination, options) : mutate(options)
}

// Bridge mode.
// Runs the destination with the new hast tree.
function bridge(destination, options) {
  return transformer

  function transformer(node, file, next) {
    destination.run(mdast2hast(node, options), file, done)

    function done(err) {
      next(err)
    }
  }
}

// Mutate-mode.
// Further transformers run on the hast tree.
function mutate(options) {
  return transformer

  function transformer(node) {
    return mdast2hast(node, options)
  }
}