#!/usr/bin/env bash
set -euo pipefail

exec 9>/tmp/start-steam.lock
flock -n 9 || exit 0

id steam >/dev/null 2>&1 || useradd -m -s /bin/bash steam
STEAM_UID="$(id -u steam)"

ROOT=/home/steam/.local/share/Steam/debian-installation
mkdir -p "${ROOT}" /tmp/xdg-steam /home/steam/tmp /run/dbus
ln -sfn /home/steam/.local/share/Steam /home/steam/.steam
chown -R steam:steam /home/steam /tmp/xdg-steam

ensure_dbus() {
  if ! dbus-send --system --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames >/dev/null 2>&1; then
    rm -f /run/dbus/pid
    dbus-daemon --system --fork >/dev/null 2>&1 || true
  fi
}

ensure_fluxbox() {
  cp -f /etc/game-server/fluxbox/init /root/.fluxbox/init 2>/dev/null || true
  if ps -eo stat=,comm= 2>/dev/null | awk '$2=="fluxbox" && $1 !~ /Z/ { exit 0 } END { exit 1 }'; then
    FB="$(ps -eo pid=,stat=,comm= | awk '$3=="fluxbox" && $2 !~ /Z/ {print $1; exit}')"
    DISPLAY=:99 fluxbox-remote reloadconfig 2>/dev/null || kill -USR1 "${FB}" 2>/dev/null || true
    return 0
  fi
  DISPLAY=:99 HOME=/root fluxbox >/dev/null 2>&1 &
  sleep 1
}

restart_fluxbox() {
  pkill -x fluxbox >/dev/null 2>&1 || true
  sleep 1
  cp -f /etc/game-server/fluxbox/init /root/.fluxbox/init 2>/dev/null || true
  DISPLAY=:99 HOME=/root fluxbox >/dev/null 2>&1 &
  sleep 1
  DISPLAY=:99 xsetroot -solid "#3c3c3c" 2>/dev/null || true
}

steam_running() {
  pgrep -u steam -f "${ROOT}/ubuntu12_32/steam -srt-logger-opened" >/dev/null 2>&1
}

steam_ui_visible() {
  DISPLAY=:99 xwininfo -root -tree 2>/dev/null | grep -qE "Steam Big Picture Mode|Sign in to Steam"
}

ensure_window_keeper() {
  command -v xdotool >/dev/null 2>&1 || return 0
  pgrep -f keep-steam-window.sh >/dev/null 2>&1 && return 0
  setsid bash /root/.config/sunshine/keep-steam-window.sh >/dev/null 2>&1 &
}

schedule_gamepadui_once() {
  [ -f /tmp/steam-gamepadui-done ] && return 0
  setsid bash -lc '
    for _ in $(seq 1 90); do
      pgrep -u steam -f steamwebhelper >/dev/null 2>&1 && break
      sleep 1
    done
    sleep 5
    runuser -u steam -- env \
      DISPLAY=:99 \
      HOME=/home/steam \
      XDG_RUNTIME_DIR=/tmp/xdg-steam \
      TMPDIR=/home/steam/tmp \
      LANG=en_US.UTF-8 \
      LC_ALL=en_US.UTF-8 \
      /usr/games/steam steam://open/gamepadui >/dev/null 2>&1 || true
    touch /tmp/steam-gamepadui-done
  ' >/dev/null 2>&1 &
}

stop_steam() {
  pkill -9 -u steam -f "steam|steamwebhelper|steam-runtime|steam-runtime-launcher" >/dev/null 2>&1 || true
  pkill -f keep-steam-window.sh >/dev/null 2>&1 || true
  sleep 1
  rm -f /home/steam/.local/share/Steam/steam.pid \
        /home/steam/.local/share/Steam/steam.pipe \
        /home/steam/.local/share/Steam/steam.token \
        /tmp/steam-gamepadui-done
  rm -rf /home/steam/.local/share/Steam/debian-installation/config/htmlcache
  rm -rf /tmp/dumps/completed /tmp/dumps/*.lock 2>/dev/null || true
  rm -f /dev/shm/u"${STEAM_UID}"-* /dev/shm/u"${STEAM_UID}"-ValveIPC* /dev/shm/.org.chromium.* /dev/shm/pulse-* 2>/dev/null || true
}

ensure_dbus
restart_fluxbox

if steam_running; then
  if steam_ui_visible; then
    ensure_window_keeper
    exit 0
  fi
  schedule_gamepadui_once
  ensure_window_keeper
  exit 0
fi

stop_steam
ensure_dbus
restart_fluxbox

setsid runuser -u steam -- env \
  DISPLAY=:99 \
  HOME=/home/steam \
  XDG_RUNTIME_DIR=/tmp/xdg-steam \
  TMPDIR=/home/steam/tmp \
  LANG=en_US.UTF-8 \
  LC_ALL=en_US.UTF-8 \
  bash -lc "cd ${ROOT} && exec /usr/games/steam -silent -no-cef-sandbox" \
  >>/home/steam/steam-app.log 2>&1 &

schedule_gamepadui_once
ensure_window_keeper
exit 0