#!/bin/bash
# Bundles a fully self-contained Python + GTK4 + gtk4-layer-shell + pycairo
# runtime into $1, closing over the *entire* shared-library dependency graph
# via ldd (not just evdev/python-xlib like the original build). This is for
# targets like NixOS that have no FHS /usr/bin/python3 or system GTK4 on
# PATH at all, so relying on "the host probably has this" doesn't hold.
#
# Includes the target's own ld.so + libc so it doesn't depend on the host
# glibc version either - AppRun invokes that ld.so explicitly with
# --library-path instead of a normal dynamic-linked exec.
set -euo pipefail

RT="$1"
mkdir -p "${RT}/lib" "${RT}/bin" "${RT}/typelibs"

PYBIN="$(python3 -c 'import sys; print(sys.executable)')"
STDLIB="$(python3 -c 'import sysconfig; print(sysconfig.get_path("stdlib"))')"

echo "Bundling python3 (${PYBIN}) + stdlib (${STDLIB})..."
cp "${PYBIN}" "${RT}/bin/python3"
mkdir -p "${RT}/python-lib"
cp -r "${STDLIB}" "${RT}/python-lib/"

DIST_PKGS="/usr/lib/python3/dist-packages"
SEEDS=(
  "${PYBIN}"
  "${DIST_PKGS}/gi/_gi.cpython-313-x86_64-linux-gnu.so"
  "${DIST_PKGS}/gi/_gi_cairo.cpython-313-x86_64-linux-gnu.so"
  "${DIST_PKGS}/cairo/_cairo.cpython-313-x86_64-linux-gnu.so"
  "/usr/lib/x86_64-linux-gnu/libgtk-4.so.1"
  "/usr/lib/x86_64-linux-gnu/libgtk4-layer-shell.so.0"
)

echo "Copying gi, cairo, evdev, Xlib Python packages..."
cp -r "${DIST_PKGS}/gi" "${RT}/"
cp -r "${DIST_PKGS}/cairo" "${RT}/"
cp -r "${DIST_PKGS}/evdev" "${RT}/"
cp -r "${DIST_PKGS}/Xlib" "${RT}/"
for so in "${DIST_PKGS}"/evdev/*.so; do
  SEEDS+=("$so")
done

echo "Resolving full shared-library closure via ldd..."
declare -A SEEN
QUEUE=("${SEEDS[@]}")
while [ "${#QUEUE[@]}" -gt 0 ]; do
  f="${QUEUE[0]}"
  QUEUE=("${QUEUE[@]:1}")
  realf="$(readlink -f "$f")"
  fname="$(basename "$f")"
  realname="$(basename "$realf")"

  # ldd/DT_NEEDED reference libraries by their SONAME (e.g.
  # libgirepository-1.0.so.1), which on Debian is often just a symlink to a
  # fully-versioned real file (libgirepository-1.0.so.1.0.0). readlink -f
  # collapses that symlink, so without this alias the dynamic linker can't
  # find the file under the name it's actually asked for at runtime.
  if [ "$fname" != "$realname" ] && [ ! -e "${RT}/lib/${fname}" ]; then
    ln -s "$realname" "${RT}/lib/${fname}"
  fi

  [ -n "${SEEN[$realf]:-}" ] && continue
  SEEN["$realf"]=1
  cp -n "$realf" "${RT}/lib/${realname}" 2>/dev/null || true

  for tok in $(ldd "$realf" 2>/dev/null | grep -o '/[^ ]*'); do
    QUEUE+=("$tok")
  done
done
echo "Bundled ${#SEEN[@]} shared libraries."

echo "Resolving full typelib closure via GIRepository dependency graph..."
TYPELIB_DIR="/usr/lib/x86_64-linux-gnu/girepository-1.0"
# Hardcoding the namespace list by hand previously missed transitive deps
# (Graphene-1.0, freetype2-2.0, xlib-2.0 were absent, breaking `import gi`
# on Gtk.init() with "Typelib file for namespace 'Graphene' not found").
# Instead ask GIRepository itself what Gtk/GdkX11/GdkWayland/Gtk4LayerShell
# transitively require, so the list can't silently drift from reality.
NAMESPACES="$(python3 -c '
import gi
from gi.repository import GIRepository
r = GIRepository.Repository.get_default()
roots = [("Gtk", "4.0"), ("GdkX11", "4.0"), ("GdkWayland", "4.0"), ("Gtk4LayerShell", "1.0")]
seen = {}
stack = []
for ns, ver in roots:
    r.require(ns, ver, 0)
    seen[ns] = ver
    stack.append(ns)
i = 0
while i < len(stack):
    ns = stack[i]
    i += 1
    for d in r.get_immediate_dependencies(ns):
        dep_ns, dep_ver = d.rsplit("-", 1)
        if dep_ns not in seen:
            r.require(dep_ns, dep_ver, 0)
            seen[dep_ns] = dep_ver
            stack.append(dep_ns)
for ns, ver in sorted(seen.items()):
    print(f"{ns}-{ver}")
' 2>/dev/null)"

for name in ${NAMESPACES}; do
  src="${TYPELIB_DIR}/${name}.typelib"
  [ -f "$src" ] && cp "$src" "${RT}/typelibs/"
done
echo "Bundled typelibs: ${NAMESPACES}"

echo "Runtime bundle assembled in ${RT}"