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(* Examine Ivory Pill Structure *)

open Nock_lib

let test_ivory_structure env =
  Printf.printf "🔍 Examining Ivory Pill Structure\n\n";

  Eio.Switch.run @@ fun _sw ->
  let fs = Eio.Stdenv.fs env in

  (* Load ivory pill *)
  let file_path = Eio.Path.(fs / "ivory.pill") in
  let pill_bytes = Eio.Path.load file_path |> Bytes.of_string in

  Printf.printf "Loading ivory pill (%d bytes)...\n" (Bytes.length pill_bytes);
  let start = Unix.gettimeofday () in
  let pill = Serial.cue pill_bytes in
  let elapsed = Unix.gettimeofday () -. start in

  Printf.printf "Cued in %.2fs\n\n" elapsed;

  Printf.printf "Top-level structure:\n";
  if Noun.is_cell pill then begin
    Printf.printf "  ✓ Is cell\n";
    let head = Noun.head pill in
    let tail = Noun.tail pill in

    Printf.printf "\nHead:\n";
    (match head with
     | Noun.Atom z ->
         Printf.printf "  Atom: %s\n" (Z.to_string z);
         Printf.printf "  Hex: 0x%s\n" (Z.format "x" z);
         Printf.printf "  Bits: %d\n" (Z.numbits z);

         (* Try to decode as ASCII cord *)
         if Z.numbits z <= 64 then begin
           let bytes = Z.to_bits z in
           Printf.printf "  ASCII (reversed): ";
           for i = 0 to String.length bytes - 1 do
             let c = bytes.[i] in
             if c >= ' ' && c <= '~' then
               Printf.printf "%c" c
             else
               Printf.printf "\\x%02x" (Char.code c)
           done;
           Printf.printf "\n"
         end;

         (* Check specific values *)
         if Z.equal z (Z.of_string "129293697897") then
           Printf.printf "  ✓ This is 'ivory' tag!\n"

     | Noun.Cell _ ->
         Printf.printf "  Cell\n");

    Printf.printf "\nTail (the ivory core):\n";
    Printf.printf "  %s\n" (if Noun.is_cell tail then "Cell" else "Atom");

    if Noun.is_cell tail then begin
      Printf.printf "  Head of tail: %s\n"
        (if Noun.is_cell (Noun.head tail) then "Cell (battery?)" else "Atom");
      Printf.printf "  Tail of tail: %s\n"
        (if Noun.is_cell (Noun.tail tail) then "Cell (payload?)" else "Atom");

      (* Test which slots exist on the core *)
      Printf.printf "\nTesting slots 2-10 on ivory core:\n";
      for slot = 2 to 10 do
        try
          let value = Noun.slot (Z.of_int slot) tail in
          Printf.printf "  Slot %2d: exists (%s)\n" slot
            (if Noun.is_cell value then "cell" else "atom")
        with _ ->
          Printf.printf "  Slot %2d: does not exist\n" slot
      done;

      (* Check if it's actually a gate [battery sample context] *)
      Printf.printf "\nGate structure analysis:\n";
      if Noun.is_cell tail then begin
        let battery = Noun.head tail in
        let rest = Noun.tail tail in
        Printf.printf "  Battery (slot 2): %s\n"
          (if Noun.is_cell battery then "Cell (contains formulas)" else "Atom");

        if Noun.is_cell rest then begin
          let sample = Noun.head rest in
          let context = Noun.tail rest in
          Printf.printf "  Sample (slot 6): %s\n"
            (if Noun.is_cell sample then "Cell" else "Atom");
          Printf.printf "  Context (slot 7): %s\n"
            (if Noun.is_cell context then "Cell" else "Atom")
        end
      end
    end

  end else
    Printf.printf "  Atom (unexpected)\n"

let () =
  Printf.printf "\n";
  Printf.printf "═══════════════════════════════════════════════════════════\n";
  Printf.printf " Examining Ivory Pill Structure\n";
  Printf.printf "═══════════════════════════════════════════════════════════\n";
  Printf.printf "\n";

  Eio_main.run test_ivory_structure