#!/bin/sh

steambase="$HOME/.local/share/Steam"
apps="$steambase/steamapps/common"

listversions() {
  # sort by version (3.7 < 3.16)
  ls -1 "$apps" | grep "^Proton " | cut --delimiter=' ' --fields=2- |
  awk --field-separator '.' '{printf "%04d%04d ",$1,$2;print $0}' |
  sort --numeric-sort --reverse | cut --delimiter=' ' --fields=2-
}

case "$1" in
  ls|list|versions|version)
    listversions
    exit 0
    ;;
esac

if [ -z "$1" ]; then
  echo "usage: $0 appid [optional proton version, for example 4.2]"
  echo "$0 ls to list versions"
  exit 1
fi

version="$2"
if [ -z "$version" ]; then
  version="$(listversions sort -r | sed 1q)"
fi
if [ -z "$version" ]; then
  echo "couldn't find a suitable proton version"
  echo "please install proton from steam at library -> tools"
  exit 1
fi

PROTONPATH="${PROTONPATH:-$apps/Proton $version}"

echo "using Proton ${PROTONPATH:-$version}"
mkdir "$steambase/steamapps/compatdata/$1"
STEAM_COMPAT_DATA_PATH="$steambase/steamapps/compatdata/$1" \
STEAM_COMPAT_CLIENT_INSTALL_PATH="$steambase" \
FONTCONFIG_PATH='' \
LD_LIBRARY_PATH="$PROTONPATH/dist/lib64/wine" \
"$PROTONPATH/proton" \
run ~/.local/share/Steam/legacycompat/iscriptevaluator.exe \
  --get-current-step $1