/* Re-implemented in C++ after GLib's gutils.c */

#include "standardpaths.hpp"

namespace fs = std::filesystem;

#ifdef _WIN32
fs::path getWindowsDirectory(void) {
    wchar_t wcp[MAX_PATH];
    fs::path windowsDir("");

    if (GetWindowsDirectoryW(wcp, MAX_PATH)) {
        // Usually X:\Windows, but in terminal server environments
        // might be an UNC path, AFAIK.
        windowsDir = widetoutf8(wcp);
    }

    if (windowsDir.empty())
        windowsDir = "C:\\";

    return windowsDir;
}


fs::path getWindowsKnownFolder(REFKNOWNFOLDERID folder_guid) {
    wchar_t *wcp = NULL;
    fs::path specialFolder("");
    HRESULT hr;

    hr = SHGetKnownFolderPath(folder_guid, 0, NULL, &wcp);

    if (SUCCEEDED (hr)) {
        specialFolder = widetoutf8(wcp);   // XXX: convert to UTF-8
    }

    CoTaskMemFree(wcp);

    return specialFolder;
}
#endif

fs::path getHomeDir() {
    const char *path_p;
    fs::path homeDir("");

    /* We first check HOME and use it if it is set */
    if (path_p = std::getenv("HOME")) {
        homeDir = path_p;
    }

#ifdef _WIN32
    /* Only believe HOME if it is an absolute path and exists.
     *
     * We only do this check on Windows fnot on UNIX because
     * of things like autofs. If the user has a bogus value in
     * $HOME they're repsonsible
     */
    if (!homeDir.empty() && !(homeDir.is_absolute() && fs::is_directory(homeDir))) {
        homeDir.clear();
    }

    if (homeDir.empty()) {
        /* USERPROFILE is probably the closest equivalent to $HOME? */
        if (path_p = std::getenv("USERPROFILE"))
            homeDir = path_p;
    }

    if (homeDir.empty()) {
        homeDir = getWindowsKnownFolder(FOLDERID_Profile);
    }

    if (homeDir.empty()) {
        homeDir = getWindowsDirectory();
    }
#endif /* _WIN32 */

#ifndef _WIN32
    if (homeDir.empty()) {
        /* If we didn't get it from any of those methods, we will have
         * to read the user database entry.
         */
        homeDir = getpwuid(getuid())->pw_dir;
    }
#endif

    /* If we have been denied access to /etc/passwd (for example, by an
     * overly-zealous LSM), make up a junk value. */
    if (homeDir.empty()) {
        homeDir = "/";
    }

    return homeDir;
}


fs::path getUserConfigDir() {
    const char *path_p;
    fs::path configDir("");

    if (path_p = std::getenv("XDG_CONFIG_HOME"))
        configDir = path_p;

#ifdef _WIN32
    else
        configDir = getWindowsKnownFolder(FOLDERID_LocalAppData);
#endif
    if (configDir.empty()) {
        configDir = getHomeDir() / ".config", NULL;
    }

    return configDir;
}