#!/usr/bin/env bash
# next/tests/host_kernel.sh — the durable-execution kernel (host_kernel.erl) over HTTP.
# Boots it as a background sx_server, then drives it with curl: category branching (newsletter →
# suspend, urgent/draft → done), sequential instance ids, and RESUME of a suspended instance in a
# SEPARATE request (durable state persists). This is the RA-live substrate.
set -uo pipefail
cd "$(git rev-parse --show-toplevel)"
SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
[ -x "$SX_SERVER" ] || SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
PORT=51878
PASS=0; FAIL=0
EPOCH_FILE=$(mktemp); LOG_FILE=$(mktemp)
cleanup() {
  [ -n "${SXPID:-}" ] && { kill -KILL "$SXPID" 2>/dev/null || true; wait "$SXPID" 2>/dev/null || true; }
  [ -n "${HOLDPID:-}" ] && { kill -KILL "$HOLDPID" 2>/dev/null || true; wait "$HOLDPID" 2>/dev/null || true; }
  rm -f "$EPOCH_FILE" "$LOG_FILE"
}
trap cleanup EXIT

cat > "$EPOCH_FILE" <<EPOCHS
(epoch 1)
(load "lib/erlang/tokenizer.sx")
(load "lib/erlang/parser.sx")
(load "lib/erlang/parser-core.sx")
(load "lib/erlang/parser-expr.sx")
(load "lib/erlang/parser-module.sx")
(load "lib/erlang/transpile.sx")
(load "lib/erlang/runtime.sx")
(load "lib/erlang/vm/dispatcher.sx")
(epoch 2)
(eval "(er-load-gen-server!)")
(eval "(get (erlang-load-module (file-read \"next/kernel/envelope.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_spec.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_store.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flows/blog_publish_digest.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/kernel/host_kernel.erl\")) :name)")
(epoch 3)
(eval "(erlang-eval-ast \"host_kernel:start($PORT)\")")
EPOCHS

FIFO=$(mktemp -u); mkfifo "$FIFO"
( cat "$EPOCH_FILE"; sleep 180 ) > "$FIFO" &
HOLDPID=$!
"$SX_SERVER" < "$FIFO" > "$LOG_FILE" 2>&1 &
SXPID=$!
rm -f "$FIFO"

echo "── waiting for host_kernel to bind :$PORT ──"
BOUND=""
for i in $(seq 1 300); do
  if (exec 3<>/dev/tcp/127.0.0.1/$PORT) 2>/dev/null; then BOUND=1; exec 3>&- 3<&-; echo "bound (iter $i)"; break; fi
  sleep 1
done
if [ -z "$BOUND" ]; then echo "FAIL: never bound"; tail -25 "$LOG_FILE"; exit 1; fi

ck() { local got; got=$(curl -s -m 8 "http://127.0.0.1:$PORT$1"); if echo "$got" | grep -q "$2"; then PASS=$((PASS+1)); echo "  ok  [$3] $1 → $got"; else FAIL=$((FAIL+1)); echo "  FAIL [$3] $1 → '$got' (want '$2')"; fi; }

echo "── driving the kernel over HTTP ──"
ck /flow/start/newsletter "1:suspended" "newsletter → instance 1, SUSPENDED (durable wait)"
ck /flow/start/urgent     "2:done"      "urgent → instance 2, DONE (sync branch)"
ck /flow/start/draft      "3:done"      "draft → instance 3, DONE (skipped)"
ck /flow/resume/1         "resume:done" "resume instance 1 (SEPARATE request) → DONE (persisted)"

echo "─────────────────────────────────────────────────────"
echo "PASS=$PASS FAIL=$FAIL"
[ "$FAIL" -eq 0 ] || { echo "--- kernel log tail ---"; tail -20 "$LOG_FILE"; }