#!/bin/sh
#
# Remote container entrypoint.
#
# codelldb binds to 127.0.0.1 only (no --host flag), so socat forwards
# connections from 0.0.0.0:13000 to codelldb on 127.0.0.1:13001.
#
# The developer station's nvim-dap connects to port 13000 and sends DAP
# launch/attach requests.  After each session ends, codelldb exits; this
# loop restarts both processes so the developer can reconnect without
# restarting the container.

set -eu

EXTERNAL_PORT="${DAP_PORT:-13000}"
INTERNAL_PORT=13001
ADAPTER="/opt/codelldb/extension/adapter/codelldb"

while true; do
    echo "[remote] codelldb DAP server on :${EXTERNAL_PORT} (forwarded to 127.0.0.1:${INTERNAL_PORT})..."

    # socat forwards external TCP to codelldb's localhost listener.
    socat TCP-LISTEN:"${EXTERNAL_PORT}",reuseaddr,fork \
          TCP:127.0.0.1:"${INTERNAL_PORT}" &
    SOCAT_PID=$!

    # Give socat a moment to bind before codelldb starts accepting.
    sleep 0.2

    # codelldb handles one --multi-session instance; exits when client disconnects.
    "$ADAPTER" --port "$INTERNAL_PORT" --multi-session

    kill "$SOCAT_PID" 2>/dev/null || true
    wait "$SOCAT_PID" 2>/dev/null || true

    echo "[remote] DAP session ended. Restarting in 1 second..."
    sleep 1
done