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open Colitur_kernel

let slug = Slug.of_string_exn
let cit part reference = { Citation.part; reference }

let entry s cs = (slug s, cs)

let ok_exn = function Ok x -> x | Error e -> Alcotest.fail e

(* Stdlib-only substring search -- Astring is not among the frozen deps. *)
let contains_substring ~needle haystack =
  let hn = String.length needle and hh = String.length haystack in
  let rec go i = i + hn <= hh && (String.sub haystack i hn = needle || go (i + 1)) in
  hn = 0 || go 0

let test_find_present () =
  let l =
    ok_exn
      (Lectionary.of_entries
         [ entry "ef-advent-sunday-1"
             [ cit Citation.First "Rom 13:11-14"; cit Citation.Gospel "Luke 21:25-33" ] ])
  in
  match Lectionary.find l (slug "ef-advent-sunday-1") with
  | Some [ a; b ] ->
      Alcotest.(check string) "epistle" "Rom 13:11-14" a.Citation.reference;
      Alcotest.(check string) "gospel" "Luke 21:25-33" b.Citation.reference
  | Some _ -> Alcotest.fail "expected exactly two citations"
  | None -> Alcotest.fail "slug not found"

let test_find_absent () =
  let l = ok_exn (Lectionary.of_entries []) in
  Alcotest.(check bool) "absent" true
    (Lectionary.find l (slug "ef-advent-sunday-1") = None)

let test_duplicate_slug_rejected () =
  let e = entry "ef-advent-sunday-1" [ cit Citation.First "Rom 13:11-14" ] in
  match Lectionary.of_entries [ e; e ] with
  | Ok _ -> Alcotest.fail "duplicate slug must be rejected"
  | Error msg ->
      (* Strengthened beyond the brief's "non-empty and contains 'e'" check:
         the interface doc promises the error names the slug, so assert the
         offending slug string actually appears in the message. *)
      Alcotest.(check bool) "names the slug" true
        (contains_substring ~needle:"ef-advent-sunday-1" msg)

let test_sexp_round_trip () =
  let l =
    ok_exn
      (Lectionary.of_entries
         [ entry "ef-lent-1-monday"
             [ cit Citation.First "Ezech 34:11-16"; cit Citation.Gospel "Matt 25:31-46" ] ])
  in
  let l' = Lectionary.t_of_sexp (Lectionary.sexp_of_t l) in
  Alcotest.(check bool) "round trips" true (l = l')

let with_temp_file contents f =
  let path = Filename.temp_file "lectionary_test" ".sexp" in
  let oc = open_out path in
  output_string oc contents;
  close_out oc;
  Fun.protect ~finally:(fun () -> Sys.remove path) (fun () -> f path)

let load_is_error contents what =
  with_temp_file contents (fun path ->
      match Lectionary.load path with
      | Error _ -> ()
      | Ok _ -> Alcotest.fail (what ^ ": expected Error, got Ok"))

let test_load_never_raises () =
  load_is_error "((ef-advent-sunday-1 (" "unterminated list";
  load_is_error "((ef-advent-sunday-1 ((part First) (reference \"x" "unterminated string";
  load_is_error "" "empty file";
  load_is_error "() ()" "more than one sexp";
  load_is_error "not-a-list" "wrong shape";
  load_is_error "((\"NOT A SLUG\" ()))" "invalid slug";
  match Lectionary.load "/nonexistent/path/lectionary.sexp" with
  | Error _ -> ()
  | Ok _ -> Alcotest.fail "missing file: expected Error, got Ok"

let test_ef_data_file_loads () =
  match Lectionary.load "../data/ef/lectionary.sexp" with
  | Error e -> Alcotest.fail e
  | Ok l ->
      (* 119 lectio ini sections, translated/widened/renamed into colitur's
         own Temporal_ef vocabulary, PLUS hand-authored/derived entries
         (tools/bootstrap_lectionary.ml's own [colitur_keys]/
         [vigil_entries]/[holy_week_entries]/[passion_tuesday_entry]/
         [nativity_octave_entries]/[derived_entries] comments have the full
         account, task 8, branch ef-lectionary, fix rounds 1-2):
         "ef-christmas-sunday-0" widens into itself PLUS "ef-holy-name-
         sunday" (+1); the three Lent Ember sections rename 1:1 (no count
         change); "ef-passiontide-0-tuesday" is EXCLUDED (fix round 2,
         Important -- it is Holy Tuesday's data, not Passion Tuesday's,
         -1); the other five Passiontide sections rename 1:1 (no count
         change); one hand-authored entry sourced from lectio's SANCTORAL
         calendar, not this lectionary ini ([ef-nativity-vigil], +1); SIX
         hand-authored directly from the Missal, all of Holy Week (+6,
         fix round 2 -- Wednesday and Friday added, the first pass's
         Critical bug); ONE hand-authored directly from the Missal,
         Passion Tuesday's own real citation (+1, fix round 2); three
         hand-authored directly from the Missal, the fixed Nativity-Octave
         days (+3); one entry derived from an already-translated one
         rather than re-typed ([ef-holy-name], +1).
         119 + 1 - 1 + 1 + 6 + 1 + 3 + 1 = 131. *)
      Alcotest.(check int) "entry count" 131
        (List.length (Lectionary.entries l));
      (match Lectionary.find l (slug "ef-lent-1-monday") with
       | Some [ a; b ] ->
           Alcotest.(check string) "epistle" "Ezech 34:11-16" a.Citation.reference;
           Alcotest.(check string) "gospel" "Matt 25:31-46" b.Citation.reference
       | Some _ -> Alcotest.fail "expected exactly two citations"
       | None -> Alcotest.fail "ef-lent-1-monday missing");
      (* Task 8's own renamed/derived/hand-authored keys, spot-checked here
         so a future regeneration that silently drops one of them fails
         loudly and locally, not only via the much bigger differential
         suite. *)
      let check_entry name first gospel =
        match Lectionary.find l (slug name) with
        | Some [ a; b ] ->
            Alcotest.(check string) (name ^ ": epistle") first a.Citation.reference;
            Alcotest.(check string) (name ^ ": gospel") gospel b.Citation.reference
        | Some _ -> Alcotest.fail (name ^ ": expected exactly two citations")
        | None -> Alcotest.fail (name ^ ": missing")
      in
      check_entry "ef-holy-name-sunday" "Gal 4:1-7" "Luke 2:33-40";
      check_entry "ef-christmas-sunday-0" "Gal 4:1-7" "Luke 2:33-40";
      check_entry "ef-holy-name" "Gal 4:1-7" "Luke 2:33-40";
      check_entry "ef-nativity-vigil" "Rom 1:1-6" "Matt 1:18-21";
      check_entry "ef-pentecost-ember-wed" "Acts 5:12-16" "John 6:44-52.";
      check_entry "ef-pentecost-ember-fri" "Joel 2:23-24; 26-27" "Luke 5:17-26";
      check_entry "ef-pentecost-ember-sat" "Rom 5:1-5." "Luke 4:38-44.";
      (* Critical 2 fix (coordinator review round 1): the Lenten Ember days,
         previously dead keys under lectio's own "ef-lent-1-<weekday>"
         naming -- now reachable under colitur's own slugs. Minor, fix
         round 2 (coordinator review): all THREE are pinned, not just
         Wednesday -- a mutation on Friday's or Saturday's own value used
         to leave the whole suite green. *)
      check_entry "ef-lent-ember-wed" "3 Kgs. 19:3-8" "Matt 12:38-50";
      check_entry "ef-lent-ember-fri" "Ezech 18:20-28" "John 5:1-15";
      check_entry "ef-lent-ember-sat" "1 Thess. 5:14-23" "Matt 17:1-9";
      (* Passiontide widens into Passion week ONLY now (Critical 1 fix) --
         "ef-passiontide-1-monday" keeps lectio's own citation;
         "ef-passiontide-2-monday" (Holy Monday) is Missal-sourced,
         DIFFERENT text, hand-authored in [holy_week_entries]. Fix round 2
         (Important): "ef-passiontide-1-tuesday" no longer carries lectio's
         own (wrong -- Holy Tuesday's) ini value; it is hand-authored from
         the Missal's own real Passion Tuesday Mass, [passion_tuesday_entry]. *)
      check_entry "ef-passiontide-1-monday" "Jonas 3:1-10" "John 7:32-39";
      check_entry "ef-passiontide-1-tuesday" "Dan 14:27, 28-42" "John 7:1-13";
      check_entry "ef-passiontide-2-monday" "Isa 50:5-10" "John 12:1-9";
      (* Gospel punctuation ("15, 1-46") intentionally kept as lectio's own
         ini already has it -- see bootstrap_lectionary.ml's own
         [holy_week_entries] comment on this one entry. *)
      check_entry "ef-passiontide-2-tuesday" "Jer 11:18-20" "Mark 14:32-72; 15, 1-46";
      (* Critical fix, round 2: Wednesday and Good Friday were left entirely
         absent by the first pass, which meant step 3 quietly resumed the
         preceding Sunday's Mass there (Good Friday emitting PALM SUNDAY's
         Epistle and Passion) -- the FIRST pass's own reasoning ("neither
         day has a single Epistle") was right about the First slot alone;
         the Gospel is always unambiguous and is now always authored, and
         First uses the SAME "last lesson before the Gospel" convention
         this file's own Lenten Ember Wednesday entry above already uses
         for an identical two-lesson shape. *)
      check_entry "ef-passiontide-2-wednesday" "Isa 53:1-12" "Luke 22:39-71; 23:1-53";
      check_entry "ef-passiontide-2-thursday" "1 Cor 11:20-32" "John 13:1-15";
      check_entry "ef-passiontide-2-friday" "Ex 12:1-11" "John 18:1-40; 19:1-42";
      check_entry "ef-passiontide-2-saturday" "Col 3:1-4" "Matt 28:1-7";
      (* Important 3(a) fix (coordinator review round 1): the fixed
         Nativity-Octave days now carry their own direct Missal formulary
         ("Diebus infra octavam Nativitatis Domini"), not Holy Name
         Sunday's (a first guess, measured wrong, reverted -- see
         [nativity_octave_entries]'s own comment). *)
      check_entry "ef-nativity-octave-day-5" "Titus 3:4-7" "Luke 2:15-20";
      check_entry "ef-nativity-octave-day-6" "Titus 3:4-7" "Luke 2:15-20";
      check_entry "ef-nativity-octave-day-7" "Titus 3:4-7" "Luke 2:15-20";
      (* Lent's OWN "ef-lent-1-wednesday/friday/saturday" keys must not
         reappear once renamed away (colitur never computes them as its
         own slug at all) -- a regression net for that decision, not
         merely documentation of it. *)
      match Lectionary.find l (slug "ef-lent-1-wednesday") with
      | None -> ()
      | Some _ ->
          Alcotest.fail "ef-lent-1-wednesday: must stay absent -- see bootstrap_lectionary.ml"

let suite =
  [ ("find present", `Quick, test_find_present);
    ("find absent", `Quick, test_find_absent);
    ("duplicate slug rejected", `Quick, test_duplicate_slug_rejected);
    ("sexp round-trip", `Quick, test_sexp_round_trip);
    ("load never raises", `Quick, test_load_never_raises);
    ("ef data file loads", `Quick, test_ef_data_file_loads) ]