# PyInstaller runtime hook. The frozen app runs with LD_LIBRARY_PATH pointing
# at its bundled libraries, and programs it starts inherit that: Flet's
# desktop client then loads the bundled (older) libstdc++ instead of the
# system's and won't start ("GLIBCXX_3.4.29 not found"). Give them the
# original value back; the app itself has already loaded what it needs.
#
# Flet's window also needs libsecret, which isn't part of GTK and some
# systems don't install ("libsecret-1.so.0: cannot open shared object file").
# The build bundles it in FallbackLibs, with libgcrypt and libgpg-error, which
# it needs; the ones this system lacks (only those) are offered to what the
# app starts, after the original path.
import os
import subprocess
import sys


def SystemHas(Name):
    """Whether the system itself has a library: asked of its linker cache
    and standard folders, not dlopen, which would also find this bundle's
    own copies (PyInstaller adds what bundled libraries need)."""
    for Folder in ("/usr/lib64", "/usr/lib", "/lib64", "/lib", "/usr/lib/x86_64-linux-gnu", "/lib/x86_64-linux-gnu"):
        if os.path.exists(os.path.join(Folder, Name)):
            return True
    try:
        Cache = subprocess.run(["ldconfig", "-p"], capture_output=True, text=True, timeout=10,
                               env={"PATH": "/usr/sbin:/usr/bin:/sbin:/bin"}).stdout
    except (OSError, subprocess.SubprocessError):
        return False
    return any(Line.strip().startswith(Name + " ") for Line in Cache.splitlines())

Paths = [os.environ["LD_LIBRARY_PATH_ORIG"]] if os.environ.get("LD_LIBRARY_PATH_ORIG") else []

Bundle = getattr(sys, "_MEIPASS", "")
Fallback = os.path.join(Bundle, "FallbackLibs")
if sys.platform.startswith("linux") and os.path.isdir(Fallback):
    InUse = os.path.join(Bundle, "FallbackLibsInUse")
    os.makedirs(InUse, exist_ok=True)
    for Name in ("libgpg-error.so.0", "libgcrypt.so.20", "libsecret-1.so.0"):
        if not SystemHas(Name) and not os.path.lexists(os.path.join(InUse, Name)):
            os.symlink(os.path.join(Fallback, Name), os.path.join(InUse, Name))
    if os.listdir(InUse):
        Paths.append(InUse)

if Paths:
    os.environ["LD_LIBRARY_PATH"] = os.pathsep.join(Paths)
else:
    os.environ.pop("LD_LIBRARY_PATH", None)