#!/usr/bin/env bash
# next/kernel/serve.sh — run host_kernel as a PERSISTENT durable-execution service (RA-live substrate).
# Loads the Erlang-on-SX runtime + next/flow + the kernel, then host_kernel:start($KERNEL_PORT) blocks
# in http:listen forever — keeping the er-scheduler + flow_store's gen_server alive so durable flow
# instances survive across requests. Doubles as a container entrypoint and a local launcher. The host's
# RA runner drives it over HTTP (GET /flow/start/<category>, GET /flow/resume/<id>).
set -uo pipefail
cd "${SX_PROJECT_DIR:-$(git rev-parse --show-toplevel 2>/dev/null || echo .)}"

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"
if [ ! -x "$SX_SERVER" ]; then echo "ERROR: sx_server.exe not found." >&2; exit 1; fi
PORT="${KERNEL_PORT:-8930}"

# The epoch stream loads everything then calls start (which blocks in http:listen). `sleep infinity`
# holds stdin open so EOF doesn't exit(0) before/while the listener serves.
{
  cat <<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($PORT)\")")
EPOCHS
  sleep infinity
} | exec "$SX_SERVER"