{ pkgs }:

pkgs.writeShellApplication {
  name = "protonge";
  runtimeInputs = with pkgs; [ curl ];
  text = ''
    baseuri="https://github.com/GloriousEggroll/proton-ge-custom/releases/download"
    latesturi="https://api.github.com/repos/GloriousEggroll/proton-ge-custom/releases/latest"
    installComplete=false;
    dstpath="$HOME/.steam/root/compatibilitytools.d" #### Destinationforlder of the Proton installations
    restartSteam=2
    autoInstall=false
    #### Set restartSteam=0 to not restart steam after installing Proton (Keep process untouched)
    #### Set restartSteam=1 to autorestart steam after installing Proton
    #### Set restartSteam=2 to to get a y/n prompt asking if you want to restart Steam after each installation.

    #### Set autoInstall=true to skip the installation prompt and install the latest not-installed, or any forced Proton GE builds
    #### Set autoInstall=false to display a installation-confirmation prompt when installing a Proton GE build

    # ########################################## CProton - Custom Proton Installscript 0.2.2 ##########################################
    # Disclaimer: Subversions like the MCC versions of Proton 4.21-GE-1, will install as it's main version and not install separately.
    # For now, this may result in false "not installed"-detections or errors while force installing a specific subversion.

    PrintReleases() {
      echo "----------Description----------"
      echo ""
      echo "Run './cproton.sh [VersionName]'"
      echo "to download specific versions."
      echo ""
      echo "------------Releases------------"
      curl -s https://api.github.com/repos/GloriousEggroll/proton-ge-custom/releases | grep -H "tag_name" | cut -d \" -f4
      echo "--------------------------------"
    }

    InstallProtonGE() {
      rsp="$(curl -sI "$url" | head -1)"
      echo "$rsp" | grep -q 302 || {
        echo "$rsp"
        exit 1
      }

      [ -d "$dstpath" ] || {
        mkdir "$dstpath"
        echo [Info] Created "$dstpath"
      }
      curl -sL "$url" > "$dstpath/Proton-$version.tar.gz" # Download archive first
      if [ -n "$sha512url" ]; then # If there is no sha512 the sha512url is empty
        if [ "$(sha512sum "$dstpath/Proton-$version.tar.gz" | cut -b -128)" == "$(curl -sL "$sha512url"| cut -b -128)" ]; then # Only the first 128 bytes are significant
          tar xfzv "$dstpath/Proton-$version.tar.gz" -C "$dstpath"
          installComplete=true
        else
          echo "sha512sum did not match! Stopping installation."
          installComplete=false
        fi
      else
        tar xfzv "$dstpath/Proton-$version.tar.gz" -C "$dstpath"
        installComplete=true
      fi
      rm "$dstpath/Proton-$version.tar.gz"
    }

    RestartSteam() {
      if [ "$( pgrep steam )" != "" ]; then
        echo "Restarting Steam"
        pkill -TERM steam #restarting Steam
        sleep 5s
        nohup steam </dev/null &>/dev/null &
      fi
    }

    RestartSteamCheck() {
      if [ "$( pgrep steam )" != "" ] && [ "$installComplete" = true ]; then
        if [ $restartSteam == 2 ]; then
          read -r -p "Do you want to restart Steam? <y/N> " prompt
          if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]; then
            RestartSteam
          else
            exit 2
          fi
        elif [ $restartSteam == 0 ]; then
          exit 0
        fi
        RestartSteam
      fi
    }

    InstallationPrompt() {
      if [ "$autoInstall" = true ]; then
        if [ ! -d "$dstpath"/Proton-"$version" ]; then
          InstallProtonGE
        fi
      else
        read -r -p "Do you want to try to download and (re)install this release? <y/N> " prompt
        if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]; then
          InstallProtonGE
        else
          echo "Operation canceled"
          exit 0
        fi
      fi
    }

    if [[ $# -eq 0 ]]; then
      version="$(curl -s $latesturi | grep -E -m1 "tag_name" | cut -d \" -f4)"
      url=$(curl -s $latesturi | grep -E -m1 "browser_download_url.*.tar.gz" | cut -d \" -f4)
      sha512url=$(curl -s $latesturi | grep -E -m1 "browser_download_url.*.sha512sum" | cut -d \" -f4)
      if [ -d "$dstpath"/Proton-"$version" ]; then
        echo "Proton $version is the latest version and is already installed."
      else
        echo "Proton $version is the latest version and is not installed yet."
      fi
      InstallationPrompt
      RestartSteamCheck
    elif [ "''${1}" == "-l" ]; then
      PrintReleases
    else
      url=$baseuri/"''${1}"/Proton-"''${1}".tar.gz
      if [ -d "$dstpath"/Proton-"''${1}" ]; then
        echo "Proton ''${1} is already installed."
      else
        echo "Proton ''${1} is not installed yet."
      fi
      InstallationPrompt
      RestartSteamCheck
    fi
  '';
}