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module Grep = Grep
module Common = Common
module Todos = Todos
module Headlines = Headlines

let start (tag : string) () =
  (* This is a rather funky state management that isn't maybe entirely functional.
     What we do is store a function for each view that restores it's state. Since the render function is
     void -> void

     This allows us to remember the state of the view and restore it as we travel between different views.

     It does create a rather funky, cyclical state though.
  *)
  let term = Common.Term.create () in
  let restore_headline_state = ref (fun () -> ()) in
  let restore_done_state = ref (fun () -> ()) in
  let restore_todo_state = ref (fun () -> ()) in
  (* DONE *)
  let goto_todo_from_done new_done_state =
    restore_done_state := new_done_state;
    !restore_todo_state ()
  in
  let goto_headlines_from_done new_done_state =
    restore_done_state := new_done_state;
    !restore_headline_state ()
  in
  (restore_done_state
   := fun () ->
        let done_state =
          Done.init
            ~goto_headlines:goto_headlines_from_done
            ~goto_todo:goto_todo_from_done
        in
        Done.render term done_state);
  (* TODO *)
  let goto_done_from_todo new_todo_state =
    restore_todo_state := new_todo_state;
    !restore_done_state ()
  in
  let goto_headline_from_todo new_todo_state =
    restore_todo_state := new_todo_state;
    !restore_headline_state ()
  in
  (restore_todo_state
   := fun () ->
        let todo =
          Todos.init
            ~goto_headlines:goto_headline_from_todo
            ~goto_done:goto_done_from_todo
        in
        Todos.render term todo);
  let headline =
    Headlines.init
      ~goto_done_view:(fun new_state ->
        restore_headline_state := new_state;
        !restore_done_state ())
      ~goto_todos_view:(fun new_state ->
        restore_headline_state := new_state;
        !restore_todo_state ())
      ~regexp:tag
  in
  Headlines.render term headline