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module Js = Js_of_ocaml.Js
module App = Editor_app

module M = struct
  type t = Forms.Add_page.t

  let key_of_title : Jstr.t -> Jstr.t = fun title -> title

  let process : t -> State.t -> State.t =
   fun { title } state ->
    let page_id = key_of_title title in
    State.new_page ~title (Some page_id) state
end

(** Create a new element *)
let create : unit -> App.event Note.event =
 fun () ->
  let title = Jstr.v "Nouvelle page" in
  let form = Forms.Add_page.create () in

  let valid_on =
    Note.S.map
      (fun Forms.Add_page.{ title } -> not @@ Jstr.equal Jstr.empty title)
      (fst form)
  in
  let ev = Elements.Popup.create ~title ~form ~valid_on () in
  Note.E.map
    (fun v -> App.dispatch (module M) v)
    (* Option.on_some trigger the event only when the pop up is validated.
       Closing the popup doesn't do anything.
    *)
    (Note.E.Option.on_some ev)