// fixtures/link-dialog.mjs — Ctrl+K. The dialog is server-rendered
// (templates/editor.html: a labelled URL field and three named
// buttons, every string from the catalog); this only opens it, waits
// for the answer, and applies it to the view the key was pressed in.
//
// A <dialog> and not window.prompt: a prompt's label is the browser's,
// its one button cannot say "remove", and it cannot be styled to meet
// the focus and target rules the rest of the page meets.
import { linkAt, setLink, removeLink } from './text-keys.mjs'
import { safeHref } from './schema.mjs'

/**
 * Wraps the dialog. open(current) shows it with the field seeded and
 * resolves to {action, href} when it closes: action is the value of
 * the button that closed it ("insert", "remove"), or "cancel" for
 * Cancel and Escape alike. A second open() while the dialog is up
 * joins the first: both resolve to the one answer, and the field is
 * not reseeded under the person typing in it.
 */
export function mountLinkDialog (dialog) {
  if (!dialog) return null
  const input = dialog.querySelector('input[name="href"]')
  let pending = null
  dialog.addEventListener('close', () => {
    const done = pending
    pending = null
    if (done) done.resolve({ action: dialog.returnValue || 'cancel', href: input.value.trim() })
  })
  return {
    open (current) {
      if (pending) return pending.promise
      input.value = current || ''
      dialog.returnValue = ''
      dialog.showModal()
      input.select()
      let resolve
      const promise = new Promise(r => { resolve = r })
      pending = { promise, resolve }
      return promise
    },
    get isOpen () { return pending !== null }
  }
}

/**
 * Opens the dialog for view's selection and applies what comes back.
 * An address outside the allowlist is treated as no address: the
 * dialog closes and the text is left as it was (setLink would refuse
 * it anyway; checking here keeps the caret where it was too).
 */
export async function linkPrompt (view, dialog) {
  if (!dialog) return
  const { action, href } = await dialog.open(linkAt(view.state))
  if (view.isDestroyed) return
  if (action === 'insert' && safeHref(href)) setLink(href)(view.state, view.dispatch)
  else if (action === 'remove') removeLink(view.state, view.dispatch)
  view.focus()
}