#include <CoreFoundation/CoreFoundation.h>
#include <libgen.h>

void py_init_osx_set_home_shared_pkg(void) {
    // sets python_home to <package>/support/pythonX.Y folder

    wchar_t *python_home;

    CFURLRef bundle_url;
    CFURLRef bundle_abs_url;
    CFStringRef bundle_str;
    const char* bundle_path;

    const char* relative_path = "support/python3.9";
    CFStringRef relative_path_str;
    CFURLRef externals_url;
    CFURLRef package_url;
    CFURLRef py_home_url;
    CFStringRef py_home_str;
    const char* py_home_path;

    // get self bundle path
    bundle_url = CFBundleCopyBundleURL(py_global_bundle);
    bundle_abs_url = CFURLCopyAbsoluteURL(bundle_url);
    bundle_str = CFURLCopyFileSystemPath(bundle_abs_url, kCFURLPOSIXPathStyle);
    bundle_path = CFStringGetCStringPtr(bundle_str, kCFStringEncodingUTF8);
    
    // get the absolute path of the <package>/support/python3.9 directory in a package
    externals_url = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorDefault, bundle_abs_url);
    package_url = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorDefault, externals_url);
    relative_path_str = CFStringCreateWithCString(kCFAllocatorDefault, relative_path, kCFStringEncodingASCII);
    py_home_url = CFURLCreateCopyAppendingPathComponent(kCFAllocatorDefault, package_url, relative_path_str, FALSE);
    py_home_str = CFURLCopyFileSystemPath(py_home_url, kCFURLPOSIXPathStyle);
    py_home_path = CFStringGetCStringPtr(py_home_str, kCFStringEncodingUTF8);

    CFRelease(bundle_str);
    CFRelease(bundle_abs_url);
    CFRelease(bundle_url);

    CFRelease(py_home_str);
    CFRelease(py_home_url);
    CFRelease(relative_path_str);
    CFRelease(package_url);
    CFRelease(externals_url);

    post("py bundle_path: %s", bundle_path);

    post("py home path: %s", py_home_path);

    python_home = Py_DecodeLocale(py_home_path, NULL);

    if (python_home == NULL) {
        error("unable to set python_home");
        return;
    }
    Py_SetPythonHome(python_home);
}