import os
import sys


def _safe_add(path: str) -> None:
    if not path or not os.path.isdir(path):
        return
    if hasattr(os, "add_dll_directory"):
        try:
            os.add_dll_directory(path)
            return
        except Exception:
            pass
    try:
        os.environ["PATH"] = path + os.pathsep + os.environ.get("PATH", "")
    except Exception:
        pass


# PyInstaller onedir 解包目录
base = getattr(sys, "_MEIPASS", None)
if base:
    _safe_add(base)
    _safe_add(os.path.join(base, "lib-dynload"))
    _safe_add(os.path.join(base, "DLLs"))
    # osgeo 子目录包含 gdal.dll / geos.dll / proj_9.dll 等 GIS 核心库
    osgeo_dir = os.path.join(base, "osgeo")
    _safe_add(osgeo_dir)

    # ★ 关键：在 PyQt5 之前预加载 osgeo 的所有 DLL
    #   避免 Qt5 DLL 加载后 osgeo DLL 加载时发生符号冲突
    if os.path.isdir(osgeo_dir):
        import ctypes as _ct
        for _f in os.listdir(osgeo_dir):
            if _f.lower().endswith('.dll'):
                _dll_path = os.path.join(osgeo_dir, _f)
                try:
                    _ct.CDLL(_dll_path)
                except Exception:
                    pass