/**
 * @typedef {import('hast').ElementContent} ElementContent
 *
 * @typedef {import('mdast').Content} Content
 * @typedef {import('mdast').Reference} Reference
 * @typedef {import('mdast').Root} Root
 *
 * @typedef {import('./state.js').State} State
 */

/**
 * @typedef {Root | Content} Nodes
 * @typedef {Extract<Nodes, Reference>} References
 */

// To do: next major: always return array.

/**
 * Return the content of a reference without definition as plain text.
 *
 * @param {State} state
 *   Info passed around.
 * @param {References} node
 *   Reference node (image, link).
 * @returns {ElementContent | Array<ElementContent>}
 *   hast content.
 */
export function revert(state, node) {
  const subtype = node.referenceType
  let suffix = ']'

  if (subtype === 'collapsed') {
    suffix += '[]'
  } else if (subtype === 'full') {
    suffix += '[' + (node.label || node.identifier) + ']'
  }

  if (node.type === 'imageReference') {
    return {type: 'text', value: '![' + node.alt + suffix}
  }

  const contents = state.all(node)
  const head = contents[0]

  if (head && head.type === 'text') {
    head.value = '[' + head.value
  } else {
    contents.unshift({type: 'text', value: '['})
  }

  const tail = contents[contents.length - 1]

  if (tail && tail.type === 'text') {
    tail.value += suffix
  } else {
    contents.push({type: 'text', value: suffix})
  }

  return contents
}