#!/usr/bin/env bash
# Bring up the headless display, then hand over.
#
# Xvfb and openbox are started as children of PID 1 (tini), NOT of the agent's
# shell, so they outlive any single command. The RE container learned this the
# hard way: a display owned by a shell gets reaped when that shell exits, which
# reads as "Xvfb dies on its own every few minutes".
set -euo pipefail

: "${DISPLAY:=:97}"
: "${SCREEN_GEOMETRY:=1280x720x24}"

if ! xdpyinfo -display "$DISPLAY" >/dev/null 2>&1; then
  Xvfb "$DISPLAY" -screen 0 "$SCREEN_GEOMETRY" -nolisten tcp &
  for _ in $(seq 50); do
    xdpyinfo -display "$DISPLAY" >/dev/null 2>&1 && break
    sleep 0.1
  done
  openbox >/dev/null 2>&1 &
fi
echo "[entrypoint] display $DISPLAY ready ($SCREEN_GEOMETRY)"

if [ -d /reborn ]; then
  echo "[entrypoint] /reborn mounted read-only — HANDOFF.md is the contract"
fi

exec "$@"