#!/usr/bin/env bash
# Start Xvfb + x11vnc + noVNC so a human can complete Reddit login
# through the dashboard, then exec the Node bot which drives Chromium
# on that virtual display.
set -euo pipefail

DISPLAY_NUM="${VNC_DISPLAY_NUM:-99}"
VNC_PORT="${VNC_PORT:-5900}"
NOVNC_PORT="${NOVNC_PORT:-6080}"
GEOMETRY="${SCREEN_GEOMETRY:-1280x800x24}"
export DISPLAY=":${DISPLAY_NUM}"

# noVNC ships under different paths depending on the distro; find the web root once.
if [ -d /usr/share/novnc ]; then
  NOVNC_WEB_DIR=/usr/share/novnc
elif [ -d /usr/share/webapps/novnc ]; then
  NOVNC_WEB_DIR=/usr/share/webapps/novnc
else
  echo "[entrypoint] could not locate noVNC web root" >&2
  exit 1
fi

# Make / on the noVNC server land on vnc.html with autoconnect.
if [ ! -e "${NOVNC_WEB_DIR}/index.html" ] && [ -e "${NOVNC_WEB_DIR}/vnc.html" ]; then
  ln -sf vnc.html "${NOVNC_WEB_DIR}/index.html"
fi

echo "[entrypoint] starting Xvfb on ${DISPLAY} (${GEOMETRY})"
Xvfb "${DISPLAY}" -screen 0 "${GEOMETRY}" -ac +extension RANDR &
XVFB_PID=$!

# Give Xvfb a moment to come up. Requires x11-utils (xdpyinfo).
for i in $(seq 1 50); do
  if xdpyinfo -display "${DISPLAY}" >/dev/null 2>&1; then
    echo "[entrypoint] Xvfb is ready after ${i} checks"
    break
  fi
  sleep 0.2
  if [ "${i}" = "50" ]; then
    echo "[entrypoint] WARNING: Xvfb did not respond after 10s" >&2
  fi
done

# Minimal window manager so dialogs and tabs aren't stuck behind the root window.
if command -v fluxbox >/dev/null 2>&1; then
  fluxbox >/dev/null 2>&1 &
fi

VNC_ARGS=(-display "${DISPLAY}" -forever -shared -rfbport "${VNC_PORT}" -nopw_warn)
if [ -n "${VNC_PASSWORD:-}" ]; then
  mkdir -p /root/.vnc
  x11vnc -storepasswd "${VNC_PASSWORD}" /root/.vnc/passwd >/dev/null
  VNC_ARGS+=(-rfbauth /root/.vnc/passwd)
  echo "[entrypoint] x11vnc starting with password auth"
else
  VNC_ARGS+=(-nopw)
  echo "[entrypoint] WARNING: VNC_PASSWORD not set — VNC has no auth"
fi

x11vnc "${VNC_ARGS[@]}" >/var/log/x11vnc.log 2>&1 &
X11VNC_PID=$!

echo "[entrypoint] starting noVNC (websockify) on :${NOVNC_PORT}"
websockify --web "${NOVNC_WEB_DIR}" "${NOVNC_PORT}" "localhost:${VNC_PORT}" \
  >/var/log/websockify.log 2>&1 &
NOVNC_PID=$!

cleanup() {
  echo "[entrypoint] shutting down"
  kill "${NOVNC_PID}" "${X11VNC_PID}" "${XVFB_PID}" 2>/dev/null || true
  wait || true
}
trap cleanup TERM INT EXIT

echo "[entrypoint] launching bot"
exec node dist/index.js