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module L = Colitur_naming.Lang

let read path =
  let ic = open_in_bin path in
  let s = really_input_string ic (in_channel_length ic) in
  close_in ic;
  s

let la () =
  match L.of_string (read "../lang/la.ini") with
  | Ok t -> t
  | Error e -> Alcotest.failf "lang/la.ini: %s" e

(* Every TEMPORAL slug the engine can emit must have a Latin name. THIS IS THE
   TEST THAT WOULD HAVE CAUGHT THE ORIGINAL DEFECT -- a booklet printed
   "ef-septuagesima-sunday-2" because nothing asserted coverage. It must fail
   loudly the moment a new slug appears without a name.

   RESTRICTED TO "^ef-" SLUGS FOR NOW (Task 3's own scope: la.ini's
   [celebration] table currently carries the temporal half only). Task 4 adds
   the sanctoral names and REMOVES this filter -- see this file's own
   [is_temporal_slug] below, kept as one clearly-named, easy-to-find place to
   change, rather than an inline condition. *)
let is_temporal_slug slug = String.length slug >= 3 && String.sub slug 0 3 = "ef-"

let test_every_temporal_slug_has_a_latin_name () =
  let t = la () in
  let layer = match Test_support.load_ef_layer () with Ok l -> l | Error e -> Alcotest.failf "%s" e in
  let ctx = Test_support.ef_context () in
  let missing = ref [] in
  for y = 2020 to 2045 do
    Array.iter
      (fun (d : (Rite_ef.Vocab_ef.season, Rite_ef.Vocab_ef.rank) Colitur_kernel.Liturgical_day.t) ->
        let slug =
          Colitur_kernel.Slug.to_string
            d.Colitur_kernel.Liturgical_day.observed.Colitur_kernel.Celebration.slug
        in
        (* A miss returns the key itself, so name = slug means "no entry". *)
        if
          is_temporal_slug slug
          && L.celebration t slug = slug
          && not (List.mem slug !missing)
        then missing := slug :: !missing)
      (Colitur_kernel.Calendar.year ctx layer y)
  done;
  if !missing <> [] then
    Alcotest.failf "%d slugs have no Latin name, e.g. %s" (List.length !missing)
      (String.concat ", " (List.filteri (fun i _ -> i < 5) !missing))

let test_vocabularies_are_complete () =
  let t = la () in
  List.iter
    (fun s -> if L.season t s = s then Alcotest.failf "no Latin season name for %S" s)
    [ "advent"; "christmastide"; "time-after-epiphany"; "septuagesima"; "lent";
      "passiontide"; "paschaltide"; "time-after-pentecost" ];
  List.iter
    (fun r -> if L.rank t r = r then Alcotest.failf "no Latin rank name for %S" r)
    [ "class-1"; "class-2"; "class-3"; "class-4" ];
  List.iter
    (fun c -> if L.colour t c = c then Alcotest.failf "no Latin colour name for %S" c)
    [ "white"; "red"; "green"; "violet"; "rose"; "black" ];
  for n = 0 to 6 do
    if L.weekday t n = string_of_int n then Alcotest.failf "no Latin weekday for %d" n
  done;
  for n = 1 to 12 do
    if L.month t n = string_of_int n then Alcotest.failf "no Latin month for %d" n
  done

let suite =
  ( "Lang/coverage",
    [ Alcotest.test_case "every temporal slug has a Latin name" `Slow
        test_every_temporal_slug_has_a_latin_name;
      Alcotest.test_case "vocabularies complete" `Quick test_vocabularies_are_complete ] )