/**
 * @typedef {import('mdast').ImageReference} ImageReference
 * @typedef {import('mdast').Parents} Parents
 * @typedef {import('../types.js').Info} Info
 * @typedef {import('../types.js').State} State
 */

imageReference.peek = imageReferencePeek

/**
 * @param {ImageReference} node
 * @param {Parents | undefined} _
 * @param {State} state
 * @param {Info} info
 * @returns {string}
 */
export function imageReference(node, _, state, info) {
  const type = node.referenceType
  const exit = state.enter('imageReference')
  let subexit = state.enter('label')
  const tracker = state.createTracker(info)
  let value = tracker.move('![')
  const alt = state.safe(node.alt, {
    before: value,
    after: ']',
    ...tracker.current()
  })
  value += tracker.move(alt + '][')

  subexit()
  // Hide the fact that we’re in phrasing, because escapes don’t work.
  const stack = state.stack
  state.stack = []
  subexit = state.enter('reference')
  // Note: for proper tracking, we should reset the output positions when we end
  // up making a `shortcut` reference, because then there is no brace output.
  // Practically, in that case, there is no content, so it doesn’t matter that
  // we’ve tracked one too many characters.
  const reference = state.safe(state.associationId(node), {
    before: value,
    after: ']',
    ...tracker.current()
  })
  subexit()
  state.stack = stack
  exit()

  if (type === 'full' || !alt || alt !== reference) {
    value += tracker.move(reference + ']')
  } else if (type === 'shortcut') {
    // Remove the unwanted `[`.
    value = value.slice(0, -1)
  } else {
    value += tracker.move(']')
  }

  return value
}

/**
 * @returns {string}
 */
function imageReferencePeek() {
  return '!'
}