#!/bin/bash

set -e

die() { echo >&2 "!! $*"; exit 1; }

# FIXME Purge old files and use this one

# File this script will modify, in addition to (potentially) the per-user sentinel file
CONF_FILE="/etc/sddm.conf.d/zz-steamos-autologin.conf"

SENTINEL_FILE="steamos-session-select"

# For sanity this shipped file must be present, to ensure we're still on a normal-looking setup.
CHECK_FILE="/etc/sddm.conf.d/manjaro.conf"

session="${1:-gamescope}"

session_launcher=""
create_sentinel=""
session_uses_x11=""

case "$session" in
  plasma-wayland-persistent)
    session_launcher="plasmawayland.desktop"
  ;;
  plasma-persistent)
    session_launcher="plasma.desktop"
    session_uses_x11=1
  ;;
  plasma)
    session_launcher="plasma-steamos-oneshot.desktop"
    create_sentinel=1
    session_uses_x11=1
  ;;
  gamescope)
#    session_launcher="gamescope-session.desktop"
    session_launcher="gamepadui-with-qam-session.desktop"
  ;;
  *)
    echo >&2 "!! Unrecognized session '$session'"
    exit 1
  ;;
esac

if [[ "$2" == "--sentinel-created" ]]; then
    SENTINEL_CREATED=1
fi

# Update config sentinel
if [[ -z $SENTINEL_CREATED ]]; then
  [[ -n ${HOME+x} ]] || die "No \$HOME variable"
  config_dir="${XDG_CONF_DIR:-"$HOME/.config"}"
  (
    cd "$HOME"
    mkdir -p "$config_dir"
    cd "$config_dir"
    echo "$session_launcher" > "$SENTINEL_FILE"
  )

  # If we were executed as a session user and then re-execute as root below, we don't want to set root's sentinel too
  export SENTINEL_CREATED=1
  echo "Updated user selected session to $session_launcher"
fi

# Become root
if [[ $EUID != 0 ]]; then
  exec pkexec "$(realpath $0)" "$session" --sentinel-created
  exit 1
fi

{
  if [[ -n $session_uses_x11 ]]; then
    # Default is Wayland
    echo "[General]"
    echo "DisplayServer=X11"
  fi
  echo "[Autologin]"
  echo "Session=$session_launcher"
} > "$CONF_FILE"

echo "Updated system autologin session to $session_launcher"
systemctl reset-failed sddm
systemctl restart sddm
echo "Restarted SDDM"