# faugus-launcher-bin - prebuilt package of https://github.com/Faugus/faugus-launcher
# (GTK4 game launcher for running Windows games through UMU-Launcher, Python).
#
# Upstream ships AppImage/deb/rpm but no Arch-friendly binary, so
# build_artifact() builds the meson project from the release tarball.

UPSTREAM_REPO="Faugus/faugus-launcher"

# Installed in CI (pacman) before build_artifact runs.
# (Translations ship as prebuilt .mo files, so no gettext needed.)
BUILD_DEPS=(meson ninja python)

latest_version() {
  gh api "repos/$UPSTREAM_REPO/releases/latest" --jq '.tag_name' | sed 's/^v//'
}

# build_artifact <version> <output-file>
build_artifact() {
  local ver="$1" outfile="$2"
  local workdir destdir srctree sitedir
  workdir="$(mktemp -d)"
  destdir="$(mktemp -d)"

  curl -sfL "https://github.com/$UPSTREAM_REPO/archive/refs/tags/$ver.tar.gz" | tar -xz -C "$workdir"
  srctree="$workdir/faugus-launcher-$ver"

  meson setup "$workdir/build" "$srctree" --prefix=/usr --buildtype=release
  meson install -C "$workdir/build" --destdir "$destdir"

  # meson installs the python modules into site-packages, whose path changes
  # with every Python minor bump and would silently break a prebuilt package.
  # Relocate to a fixed dir and put it on the launcher's PYTHONPATH (the
  # launcher script already appends any pre-set PYTHONPATH to its own).
  sitedir="$(find "$destdir/usr/lib" -maxdepth 2 -type d -name site-packages)"
  [[ -d "$sitedir/faugus" ]] || { echo "faugus module not found in $sitedir" >&2; return 1; }
  mkdir -p "$destdir/usr/lib/faugus-launcher"
  mv "$sitedir/faugus" "$destdir/usr/lib/faugus-launcher/"
  rm -rf "$destdir/usr/lib/python"*

  head -1 "$destdir/usr/bin/faugus-launcher" | grep -qx '#!/bin/sh' \
    || { echo "unexpected launcher script format" >&2; return 1; }
  sed -i '1a export PYTHONPATH="/usr/lib/faugus-launcher${PYTHONPATH:+:$PYTHONPATH}"' \
    "$destdir/usr/bin/faugus-launcher"

  # These caches are generated by pacman hooks; shipping them would cause
  # file conflicts on install.
  rm -f "$destdir/usr/share/applications/mimeinfo.cache" \
        "$destdir/usr/share/icons/hicolor/icon-theme.cache"

  tar --zstd --sort=name --owner=0 --group=0 --numeric-owner --mtime='@0' \
      -cf "$outfile" -C "$destdir" usr

  rm -rf "$workdir" "$destdir"
}