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(*
 * Copyright (c) 2014 Leo White <leo@lpw25.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *)

let contains_double_underscore s =
  let len = String.length s in
  let rec aux i =
    if i > len - 2 then false
    else if s.[i] = '_' && s.[i + 1] = '_' then true
    else aux (i + 1)
  in
  aux 0

module Package = struct
  type t = string

  module Table = Hashtbl.Make (struct
    type nonrec t = t

    let equal : t -> t -> bool = ( = )

    let hash : t -> int = Hashtbl.hash
  end)
end

module Odoc_file = struct
  type compilation_unit = { name : string; hidden : bool }

  type t = Page of string | Compilation_unit of compilation_unit

  let create_unit ~force_hidden name =
    let hidden = force_hidden || contains_double_underscore name in
    Compilation_unit { name; hidden }

  let create_page name = Page name

  let name = function Page name | Compilation_unit { name; _ } -> name

  let hidden = function Page _ -> false | Compilation_unit m -> m.hidden
end

type t = {
  id : Paths.Identifier.OdocId.t;
  file : Odoc_file.t;
  digest : Digest.t;
}

let equal : t -> t -> bool = ( = )

let hash : t -> int = Hashtbl.hash

let to_string t =
  let rec pp fmt (id : Paths.Identifier.OdocId.t) =
    match id.iv with
    | `LeafPage (parent, name) | `Page (parent, name) -> (
        match parent with
        | Some p ->
            Format.fprintf fmt "%a::%a" pp
              (p :> Paths.Identifier.OdocId.t)
              Names.PageName.fmt name
        | None -> Format.fprintf fmt "%a" Names.PageName.fmt name)
    | `Root (Some parent, name) ->
        Format.fprintf fmt "%a::%a" pp
          (parent :> Paths.Identifier.OdocId.t)
          Names.ModuleName.fmt name
    | `Root (None, name) -> Format.fprintf fmt "%a" Names.ModuleName.fmt name
  in

  Format.asprintf "%a" pp t.id

let compare x y = String.compare x.digest y.digest

module Hash_table = Hashtbl.Make (struct
  type nonrec t = t

  let equal = equal

  let hash = hash
end)