# Layout ------------------------------------------------------------------

#' Bulma Level
#'
#' A multi-purpose horizontal level that can contain almost any other element.
#'
#' @param ... Items to be wrapped in a `"level-item"` `<div>` and included in the
#'   main level container. If only one argument is provided and that argument is
#'   a list, the items inside the list will be treated as individual level items.
#' @param left A list of items to be placed in the left side of the level in a
#'   `"level-left"` container.
#' @param right A list of items to be placed in the right side of the level in a
#'   `"level-right"` container.
#' @param type One of `"item"` or `"header"`. The default (`"item"`) places level
#'   items in the standard `"level-item"` container. Use `"header"` to use the
#'   names of the arguments in `...` as headers over their elements to create a
#'   large single-row pseudo-table. See examples for more details.
#' @param container_tag Which tag should be used for the main `"level"` container?
#'   One of `"div"` or `"nav"`.
#' @param class Additional classes applied to level container
#' @param style Additional style parameters applied to level container
#' @param level_class Additional classes applied to all level item containers (except
#'   for manually created level items).
#' @param level_style Additional style arguments applied to all level item containers
#'   (except for manually create level items).
#' @examples
#' bulma_level("Home", "Menu", "Bulma", "Reservations", "Contact")
#' bulma_level("Tweets" = 3456, Following = 123, Followers = "456K", Likes = 789, type = "header")
#'
#' iris_vals <- lapply(iris, function(x) length(unique(x)))
#' bulma_level(iris_vals, type = "header")
#'
#' @references <https://bulma.io/documentation/layout/level/>
#' @family Bulma layouts
#' @export
bulma_level <- function(
  ...,
  left = NULL,
  right = NULL,
  is_mobile = TRUE,
  type = c("item", "header"),
  container_tag = c("div", "nav"),
  class = NULL,
  style = NULL,
  level_class = NULL,
  level_style = NULL
) {
  type <- match.arg(type)
  tag_f <- tag_function(match.arg(container_tag))
  x <- tag_f(
    class = c_str("level", if (is_mobile) "is-mobile", class),
    style = style,
    level_side(left, "left"),
    if (type == "item")
      tagList(lapply(dots2list(...), bulma_level_item, class = level_class, style = level_style)),
    if (type == "header") bulma_level_items_header(..., class = level_class, style = level_style),
    level_side(right, "right")
  )

  x
}

#' Bulma Level Item
#'
#' Constructs an individual level item.
#'
#' @param ... Elements to be included in the level item
#' @param class Additional classes to be applied to the level item container
#' @param style Additional CSS style directives to be applied to the level item container
#' @family Bulma layouts
#' @export
bulma_level_item <- function(..., class = NULL, style = NULL) {
  item <- dots2list(...)
  if (is_level_item(item)) return(item)
  as_level_item(
    tag_div(class = c_str("level-item", class),
            style = style,
            item)
  )
}

as_level_item <- function(x) {
  if (inherits(x, "level_item")) return(x)
  class(x) <- c("level_item", class(x))
  x
}

is_level_item <- function(x) inherits(x, "level_item")

level_side <- function(x, side = "left") {
  if (is.null(x)) return(NULL)
  match.arg(side, c("left", "right"))
  items <- lapply(x, bulma_level_item)
  tag_div(class = c_prefix(side, "level-"), items)
}

#' Bulma Level Items with Headers
#'
#' Takes named arguments and converts them to
#' (level items with headers)[bulma_level_item_header].
#'
#' @inheritParams bulma_level_item
#' @param header_class Additional classes to be applied to the header (upper)
#'   container in addition to `"heading"`
#' @param body_class Additional classes to be applied to the title (lower)
#'   container in addition to `"title"`
#' @family Bulma layouts
#' @export
bulma_level_items_header <- function(..., class = NULL, style = NULL, header_class = NULL, body_class = NULL) {
  items <- dots2list(...)
  x <- map_arg(
    .f = bulma_level_item_header,
    names(items),
    items,
    .args = list(class = if (is.null(class)) "has-text-centered" else class,
                style = style,
                header_class = header_class,
                body_class = body_class)
  )
  tagList(x)
}

#' Bulma Level Item with Header
#'
#' Constructs an individual level item with a header (upper) and a title (lower).
#'
#' @param item_name The header (or name) of the item
#' @param item_body The body of the item
#' @inheritParams bulma_level_items_header
#' @family Bulma layouts
#' @export
bulma_level_item_header <- function(item_header, item_body, class = NULL, style = NULL, header_class = NULL, body_class = NULL) {
  bulma_level_item(
    class = class,
    style = style,
    tag_div(
      tag_p(class = c_str("heading", header_class), item_header),
      tag_p(class = c_str("title", body_class), item_body)
    ))
}