#!/usr/bin/env bash
# next/tests/cid.sh — Step 1b acceptance test.
#
# Loads next/kernel/nx_cid.erl into the Erlang-on-SX runtime and checks
# the canonical CID contract: determinism, uniqueness, equality, and
# to_string/from_string round-trip. 12 cases.

set -uo pipefail
cd "$(git rev-parse --show-toplevel)"

SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
if [ ! -x "$SX_SERVER" ]; then
  SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
fi
if [ ! -x "$SX_SERVER" ]; then
  echo "ERROR: sx_server.exe not found." >&2
  exit 1
fi

VERBOSE="${1:-}"
PASS=0; FAIL=0; ERRORS=""
TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT

cat > "$TMPFILE" <<'EPOCHS'
(epoch 1)
(load "lib/erlang/tokenizer.sx")
(load "lib/erlang/parser.sx")
(load "lib/erlang/parser-core.sx")
(load "lib/erlang/parser-expr.sx")
(load "lib/erlang/parser-module.sx")
(load "lib/erlang/transpile.sx")
(load "lib/erlang/runtime.sx")
(load "lib/erlang/vm/dispatcher.sx")

(epoch 2)
(eval "(get (erlang-load-module (file-read \"next/kernel/nx_cid.erl\")) :name)")

;; from_sx returns a binary
(epoch 10)
(eval "(get (erlang-eval-ast \"is_binary(nx_cid:from_sx(foo))\") :name)")

;; from_sx is deterministic on atoms / ints / compound terms
(epoch 11)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx(foo) =:= nx_cid:from_sx(foo)\") :name)")
(epoch 12)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx(42) =:= nx_cid:from_sx(42)\") :name)")
(epoch 13)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx({a, [1, 2, 3]}) =:= nx_cid:from_sx({a, [1, 2, 3]})\") :name)")

;; from_sx is collision-resistant on distinct terms
(epoch 20)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx(foo) =/= nx_cid:from_sx(bar)\") :name)")
(epoch 21)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx(1) =/= nx_cid:from_sx(2)\") :name)")
(epoch 22)
(eval "(get (erlang-eval-ast \"nx_cid:from_sx([1, 2]) =/= nx_cid:from_sx([1, 2, 3])\") :name)")

;; equals/2 is alias for =:=
(epoch 30)
(eval "(get (erlang-eval-ast \"nx_cid:equals(nx_cid:from_sx(foo), nx_cid:from_sx(foo))\") :name)")
(epoch 31)
(eval "(get (erlang-eval-ast \"nx_cid:equals(nx_cid:from_sx(foo), nx_cid:from_sx(bar))\") :name)")

;; to_string + from_string round-trip
(epoch 40)
(eval "(get (erlang-eval-ast \"nx_cid:equals(nx_cid:from_string(nx_cid:to_string(nx_cid:from_sx(foo))), nx_cid:from_sx(foo))\") :name)")
(epoch 41)
(eval "(get (erlang-eval-ast \"is_binary(nx_cid:to_string(nx_cid:from_sx({tuple, 1, 2})))\") :name)")

;; CIDv1 raw codec sha256 base32 form is around 59 chars; sanity-check length
(epoch 50)
(eval "(get (erlang-eval-ast \"byte_size(nx_cid:from_sx(hello)) > 50\") :name)")
EPOCHS

OUTPUT=$(timeout 120 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)

check() {
  local epoch="$1" desc="$2" expected="$3"
  local actual
  actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
    $0 ~ "^\\(ok-len " e " " { getline; print; exit }
    $0 ~ "^\\(ok " e " "     { print; exit }
    $0 ~ "^\\(error " e " "  { print; exit }
  ')
  [ -z "$actual" ] && actual="<no output for epoch $epoch>"
  if echo "$actual" | grep -qF -- "$expected"; then
    PASS=$((PASS+1))
    [ "$VERBOSE" = "-v" ] && echo "  ok $desc"
  else
    FAIL=$((FAIL+1))
    ERRORS+="  FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
"
  fi
}

check  2  "module load name"                "nx_cid"
check 10  "from_sx returns binary"          "true"
check 11  "from_sx atom deterministic"      "true"
check 12  "from_sx int deterministic"       "true"
check 13  "from_sx compound deterministic"  "true"
check 20  "from_sx atoms distinct"          "true"
check 21  "from_sx ints distinct"           "true"
check 22  "from_sx lists distinct"          "true"
check 30  "equals same CIDs"                "true"
check 31  "equals different CIDs"           "false"
check 40  "to_string/from_string round-trip" "true"
check 41  "to_string returns binary"        "true"
check 50  "CIDv1 base32 length sanity"      "true"

TOTAL=$((PASS+FAIL))
if [ $FAIL -eq 0 ]; then
  echo "ok $PASS/$TOTAL next/tests/cid.sh passed"
else
  echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
  echo "$ERRORS"
fi
[ $FAIL -eq 0 ]