{ config, pkgs, lib, ... }:

let
  cfg = config.programs.tibia;

  # Legacy libxml2 (2.9.x) — wymagany przez Tibię, usunięty z nixpkgs-unstable
  libxml2_2_9 = pkgs.callPackage ../../packages/libxml2-2.9 { };

  # Wspólne ścieżki bibliotek
  tibiaLibPath = lib.makeLibraryPath [
    pkgs.nss
    pkgs.nspr
    pkgs.libxkbfile
    libxml2_2_9
  ];

  # Helper: eksport LD_LIBRARY_PATH
  exportLibs = ''
    export LD_LIBRARY_PATH="${tibiaLibPath}:$LD_LIBRARY_PATH"
  '';

  # Wrapper dla właściwego clienta (uruchamiany przez Tibia package.json)
  tibiaClientWrapper = pkgs.writeShellScriptBin "tibia-client" ''
    #!/usr/bin/env bash
    ${exportLibs}
    exec steam-run "$HOME/.local/share/CipSoft GmbH/Tibia/packages/Tibia/bin/client" "$@"
  '';

  # Patchuje package.json Tibii żeby używała wrappera zamiast surowego binary
  tibiaPatcher = pkgs.writeShellScriptBin "tibia-patch" ''
    #!/usr/bin/env bash
    set -e

    PKGDIR="$HOME/.local/share/CipSoft GmbH/Tibia/packages/Tibia"
    PKGJSON="$PKGDIR/package.json"
    LOCALWRAPPER="$PKGDIR/tibia-client-wrapper"

    if [ ! -f "$PKGJSON" ]; then
      echo "package.json not found — run the launcher once first."
      exit 0
    fi

    if grep -q "tibia-client-wrapper" "$PKGJSON" 2>/dev/null; then
      echo "Already patched."
      exit 0
    fi

    cat > "$LOCALWRAPPER" <<'TIBIA_WRAPPER'
    #!/usr/bin/env bash
    ${exportLibs}
    exec ${tibiaClientWrapper}/bin/tibia-client "$@"
TIBIA_WRAPPER
    chmod +x "$LOCALWRAPPER"

    sed -i 's#"executable": "bin/client"#"executable": "tibia-client-wrapper"#' "$PKGJSON"

    echo "Tibia client patched to use tibia-client-wrapper."
  '';

  # Uruchamia launcher Tibii (pobrany ręcznie przez tibia-install)
  tibiaLauncherWrapper = pkgs.writeShellScriptBin "tibia" ''
    #!/usr/bin/env bash
    set -e

    LAUNCHER="$HOME/Gry/Tibia/Tibia"

    if [ ! -x "$LAUNCHER" ]; then
      echo "Tibia launcher not found at:"
      echo "  $LAUNCHER"
      echo ""
      echo "Run 'tibia-install' first, or download manually from:"
      echo "  https://www.tibia.com/download/"
      exit 1
    fi

    tibia-patch

    ${exportLibs}
    exec steam-run "$LAUNCHER"
  '';

  # Pomija launcher, odpala clienta bezpośrednio
  tibiaDirect = pkgs.writeShellScriptBin "tibia-direct" ''
    #!/usr/bin/env bash

    CLIENT="$HOME/.local/share/CipSoft GmbH/Tibia/packages/Tibia/bin/client"

    if [ ! -x "$CLIENT" ]; then
      echo "Tibia client not found."
      echo "Run 'tibia' once so the launcher downloads the client."
      exit 1
    fi

    ${exportLibs}
    exec steam-run "$CLIENT"
  '';

  # Instaluje launcher Tibii na nowym systemie
  tibiaInstall = pkgs.writeShellScriptBin "tibia-install" ''
    #!/usr/bin/env bash
    set -e

    URL="https://static.tibia.com/download/tibia.x64.tar.gz"
    DEST="$HOME/Gry/Tibia"
    TMPDIR=$(mktemp -d)
    trap "rm -rf $TMPDIR" EXIT

    echo "Downloading Tibia launcher from $URL ..."
    wget -q --show-progress -O "$TMPDIR/tibia.tar.gz" "$URL"

    mkdir -p "$DEST"
    tar xzf "$TMPDIR/tibia.tar.gz" -C "$DEST"
    chmod +x "$DEST/Tibia"

    echo ""
    echo "Tibia launcher installed to: $DEST/Tibia"
    echo "Run 'tibia' to start."
  '';

  # .desktop entry
  tibiaDesktop = pkgs.makeDesktopItem {
    name = "tibia";
    exec = "tibia-direct";
    desktopName = "Tibia";
    comment = "Tibia MMORPG Client";
    categories = [ "Game" ];
  };

in {
  options.programs.tibia = {
    enable = lib.mkEnableOption "Tibia game client support";
  };

  config = lib.mkIf cfg.enable {
    home.packages = with pkgs; [
      steam-run
      libxml2_2_9
      wget
      tibiaClientWrapper
      tibiaPatcher
      tibiaLauncherWrapper
      tibiaDirect
      tibiaInstall
      tibiaDesktop
    ];
  };
}