#!/bin/bash

short_session_tracker_file="/tmp/steamos-short-session-tracker"
short_session_start_file="/tmp/steamos-short-session-start"
short_session_duration=60
short_session_count_before_reset=3

do_repair() {
  # This should really be part of the steam launcher as `steam --repair` or similar, but we presently only have
  # `steam --reset` which is too heavy of a hammer.

  echo >&2 "steam-short-session-tracker: Re-bootstrapping steam from OS copy."
  # at this point, might as well make sure we won't relaunch on a sideloaded build
  rm -f -- "$HOME/devkit-game/devkit-steam"
  mkdir -p ~/.local/share/Steam
  # remove some caches and stateful things known to cause Steam to fail to start if corrupt
  rm -rf --one-file-system ~/.local/share/Steam/config/widevine
  # cleanup the steam config dir, i.e. ~/.steam. We should try to preserve registry.vdf if possible
  steam_config_dir="$HOME/.steam"
  steam_config_backup_dir="$HOME/dot-steam.bak.$(date +%s)"
  registry_vdf="$steam_config_dir/registry.vdf"
  registry_backup_vdf="$steam_config_backup_dir/.steam/registry.vdf"
  mv "$steam_config_dir" "$steam_config_backup_dir"
  mkdir -p "$steam_config_dir"
  cp -f "$registry_backup_vdf" "$registry_vdf" || true
  # restore clean copy of binaries from RO partition
  tar xf /usr/lib/steam/bootstraplinux_ubuntu12_32.tar.xz -C ~/.local/share/Steam
  # rearm
  rm "$short_session_tracker_file"
}

handle_started() {
  short_session_count=$(< "$short_session_tracker_file" wc -l)
  touch $short_session_start_file

  if [[ "$short_session_count" -ge "$short_session_count_before_reset" ]]; then
    echo >&2 "steam-short-session-tracker: Steam failed to start $short_session_count_before_reset times within $short_session_duration seconds"

    if [ -f "$HOME/.config/inhibit-short-session-tracker" ]; then
      echo >&2 "steam-short-session-tracker: Auto-repair disabled by config. Remove ~/.config/inhibit-short-session-tracker to re-enable"
      return
    fi

    do_repair
  fi
}

handle_stopped() {
  seconds_since_started=$(($(date +%s) - $(date +%s -r "$short_session_start_file")))

  if [[ "seconds_since_started" -lt "$short_session_duration" ]]; then
    echo "frog" >> "$short_session_tracker_file"
  else
    rm "$short_session_tracker_file"
  fi
}

case "$1" in
  --track-started)
    echo "steam-short-session-tracker: Tracking Steam start (unimplemented)"
    # handle_started
    ;;
  --track-stopped)
    echo "steam-short-session-tracker: Tracking Steam stop (unimplemented)"
    # handle_stopped
    ;;
  --repair-now)
    echo "steam-short-session-tracker: Performing immediate repair (unimplemented)"
    # do_repair
    ;;
  *)
    echo "Usage: $0 --track-started | --track-stopped | --repair-now"
    exit 1
    ;;
esac

exit 0