// ==========================================
// DOMAIN: ПРИЛОЖЕНИЯ
// ==========================================
#import "document.typ": fail

#let attachment(
  id,
  title,
  body,
  subtitle: none,
  number: auto,
  outlined: true,
) = {
  if type(id) != str or id.trim() == "" {
    fail("attachment.id", "нужна непустая строка")
  }
  if type(title) not in (str, content) {
    fail("attachment.title", "ожидались str или content")
  }
  if type(body) not in (content, function) {
    fail("attachment.body", "ожидались content или function")
  }
  if subtitle != none and type(subtitle) not in (str, content) {
    fail("attachment.subtitle", "ожидались none, str или content")
  }
  (
    kind: "attachment",
    id: id,
    title: title,
    subtitle: subtitle,
    body: body,
    number: number,
    outlined: outlined,
  )
}

#let attachment-set(items: (), numbering: "arabic", start: 1) = {
  if type(items) != array {
    fail("attachments.items", "ожидался array")
  }
  if numbering not in ("arabic", "cyrillic", "none") {
    fail("attachments.numbering", "допустимы arabic, cyrillic, none")
  }
  if type(start) != int or start < 1 {
    fail("attachments.start", "нужно положительное целое число")
  }
  let seen = ()
  for item in items {
    if type(item) != dictionary or item.at("kind", default: none) != "attachment" {
      fail("attachments.items", "каждый элемент должен быть attachment")
    }
    if item.id in seen {
      fail("attachments.items", "повторяющийся id " + repr(item.id))
    }
    seen.push(item.id)
  }
  (
    kind: "attachment-set",
    items: items,
    numbering: numbering,
    start: start,
  )
}

#let validate-attachment-set(value) = {
  if type(value) == array {
    attachment-set(items: value)
  } else if type(value) != dictionary or value.at("kind", default: none) != "attachment-set" {
    fail("attachments", "ожидались array или attachment-set")
  } else {
    attachment-set(
      items: value.at("items", default: ()),
      numbering: value.at("numbering", default: "arabic"),
      start: value.at("start", default: 1),
    )
  }
}