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open Core
module S = Set.Make (String)

type t = S.t

let default_words =
  [
    "A";
    "I";
    "HELLO";
    "WORLD";
    "TEST";
    "AI";
    "HI";
    "CODE";
    "DOG";
    "CAT";
    "READ";
    "WRITE";
    "GAME";
    "WORD";
    "PLAY";
  ]

let load_from_file path =
  In_channel.read_lines path
  |> List.fold ~init:S.empty ~f:(fun acc line ->
         let word = String.uppercase (String.strip line) in
         if String.is_empty word then acc else Set.add acc word)

let load_default () =
  List.fold default_words ~init:S.empty ~f:(fun acc w -> Set.add acc w)

let load ?path () =
  match path with
  | Some p when Sys_unix.is_file_exn p -> load_from_file p
  | _ -> load_default ()

let is_valid ?dict word =
  let dict = Option.value dict ~default:(load_default ()) in
  Set.mem dict (String.uppercase word)