structure Regression =
struct
  open Railroad
  open Railroad.Test

  fun updateLoop (pos, str, app) =
    if pos = String.size str then
      app
    else
      let
        val chr = String.sub (str, pos)
        val () = ExceptionLogger.addCommand (InputMsg.CHAR_EVENT chr)
        val app = AppUpdate.update (app, InputMsg.CHAR_EVENT chr)
      in
        updateLoop (pos + 1, str, app)
      end

  fun applyChars (historyString, app) = updateLoop (0, historyString, app)

  fun appFromText text =
    let val buffer = LineGap.fromString text
    in AppType.init (buffer, 0, 0)
    end

  fun loadFromFile (io, acc) =
    case TextIO.inputLine io of
      SOME line => loadFromFile (io, acc ^ line)
    | NONE => acc

  val initialText =
    let
      val io = TextIO.openIn "temp.txt"
      val str = loadFromFile (io, "")
      val () = TextIO.closeIn io
    in
      str
    end

  val initialApp = appFromText initialText

  val charEventTests = describe "CHAR_EVENT regressions"
    [test "SearchList.goToNum vector bounds regression (1)" (fn _ =>
       let
         val app = appFromText initialText
         val history = "G12dk"
         val newApp = applyChars (history, app)
       in
         (* just expect that we do not fail or throw an exception *)
         Expect.isTrue true
       end),

       test "idk yet" (fn _ =>
       let
         val app = appFromText initialText
         val history = "16G18ddjjjjjjjjjdkdkdkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj"
         val newApp = applyChars (history, app)
       in
         Expect.isTrue true
       end
       )
    ]

  val tests = [charEventTests]
end