#!/usr/bin/env bash
# next/tests/sandbox_eval.sh — Step 7d-pure test.
#
# Exercises sandbox:eval_pure/2 and eval_pure/3. Catches all
# three exception classes (throw / error / exit) and returns
# them tagged. Successful fold-shaped (Activity, State) calls
# pass through unchanged. 13 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/sandbox.erl\")) :name)")

;; eval_pure/2 normal return
(epoch 10)
(eval "(get (erlang-eval-ast \"sandbox:eval_pure(fun (X) -> X + 1 end, 41) =:= {ok, 42}\") :name)")

;; eval_pure/2 throw caught
(epoch 11)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_) -> throw(boom) end, 1) of {error, {throw, boom}} -> ok; _ -> bad end\") :name)")

;; eval_pure/2 error caught
(epoch 12)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_) -> erlang:error(crash) end, 1) of {error, {error, crash}} -> ok; _ -> bad end\") :name)")

;; eval_pure/2 exit caught
(epoch 13)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_) -> erlang:exit(bye) end, 1) of {error, {exit, bye}} -> ok; _ -> bad end\") :name)")

;; eval_pure/2 carries the original argument through
(epoch 14)
(eval "(get (erlang-eval-ast \"sandbox:eval_pure(fun (X) -> X end, marker) =:= {ok, marker}\") :name)")

;; eval_pure/2 returning a tuple is wrapped in {ok, _}
(epoch 15)
(eval "(get (erlang-eval-ast \"sandbox:eval_pure(fun (_) -> {a, b} end, 0) =:= {ok, {a, b}}\") :name)")

;; eval_pure/3 normal return (Activity, State) shape
(epoch 16)
(eval "(get (erlang-eval-ast \"sandbox:eval_pure(fun (A, S) -> S + A end, 10, 5) =:= {ok, 15}\") :name)")

;; eval_pure/3 throw caught
(epoch 17)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_, _) -> throw(stop) end, x, y) of {error, {throw, stop}} -> ok; _ -> bad end\") :name)")

;; eval_pure/3 error caught
(epoch 18)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_, _) -> erlang:error(badarith) end, 1, 2) of {error, {error, badarith}} -> ok; _ -> bad end\") :name)")

;; eval_pure/3 fold-style fun: tag activities into state
(epoch 19)
(eval "(get (erlang-eval-ast \"Fold = fun ({tag, T}, S) -> [T | S]; (_, S) -> S end, sandbox:eval_pure(Fold, {tag, foo}, []) =:= {ok, [foo]}\") :name)")

;; Successful eval_pure does not catch silently — distinguishes ok+nil from error
(epoch 20)
(eval "(get (erlang-eval-ast \"sandbox:eval_pure(fun (_) -> nil end, 0) =:= {ok, nil}\") :name)")

;; Tuple reason inside the caught exception is preserved
(epoch 21)
(eval "(get (erlang-eval-ast \"case sandbox:eval_pure(fun (_) -> throw({bad_input, {field, x}}) end, 0) of {error, {throw, {bad_input, {field, x}}}} -> ok; _ -> bad end\") :name)")
EPOCHS

OUTPUT=$(timeout 60 "$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"                  "sandbox"
check 10  "eval_pure/2 normal return"         "true"
check 11  "eval_pure/2 throw caught"          "ok"
check 12  "eval_pure/2 error caught"          "ok"
check 13  "eval_pure/2 exit caught"           "ok"
check 14  "eval_pure/2 arg passthrough"       "true"
check 15  "eval_pure/2 tuple wrapped in ok"   "true"
check 16  "eval_pure/3 fold-shape success"    "true"
check 17  "eval_pure/3 throw caught"          "ok"
check 18  "eval_pure/3 error caught"          "ok"
check 19  "eval_pure/3 tag-fold body"         "true"
check 20  "ok+nil distinct from error"        "true"
check 21  "tuple reason preserved"            "ok"

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