// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under    *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0          *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************

#include "recycler.h"
#include "file_access.h"

    #include <sys/stat.h>
    #include <gio/gio.h>
    #include "scope_guard.h"

using namespace zen;




bool zen::recycleOrDeleteIfExists(const Zstring& itemPath) //throw FileError
{
    GFile* file = ::g_file_new_for_path(itemPath.c_str()); //never fails according to docu
    ZEN_ON_SCOPE_EXIT(g_object_unref(file);)

    GError* error = nullptr;
    ZEN_ON_SCOPE_EXIT(if (error) ::g_error_free(error));

    if (!::g_file_trash(file, nullptr, &error))
    {
        const std::optional<ItemType> type = itemStillExists(itemPath); //throw FileError
        if (!type)
            return false;

        /*  g_file_trash() can fail with different error codes/messages when trash is unavailable:
                Debian 8 (GLib 2.42): G_IO_ERROR_NOT_SUPPORTED: Unable to find or create trash directory
                CentOS 7 (GLib 2.56): G_IO_ERROR_FAILED:        Unable to find or create trash directory for file.txt
                master   (GLib 2.64): G_IO_ERROR_NOT_SUPPORTED: Trashing on system internal mounts is not supported
                https://gitlab.gnome.org/GNOME/glib/blob/master/gio/glocalfile.c#L2042                              */
        const bool trashUnavailable = error &&
                                      ((error->domain == G_IO_ERROR && error->code == G_IO_ERROR_NOT_SUPPORTED) ||
                                       startsWith(error->message, "Unable to find or create trash directory"));
        if (trashUnavailable) //implement same behavior as on Windows: if recycler is not existing, delete permanently
        {
            if (*type == ItemType::folder)
                removeDirectoryPlainRecursion(itemPath); //throw FileError
            else
                removeFilePlain(itemPath); //throw FileError
            return true;
        }

        throw FileError(replaceCpy(_("Unable to move %x to the recycle bin."), L"%x", fmtPath(itemPath)),
                        formatGlibError("g_file_trash", error));
    }
    return true;
}


/* We really need access to a similar function to check whether a directory supports trashing and emit a warning if it does not!

   The following function looks perfect, alas it is restricted to local files and to the implementation of GIO only:

    gboolean _g_local_file_has_trash_dir(const char* dirpath, dev_t dir_dev);
    See: http://www.netmite.com/android/mydroid/2.0/external/bluetooth/glib/gio/glocalfileinfo.h

    Just checking for "G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH" is not correct, since we find in
    http://www.netmite.com/android/mydroid/2.0/external/bluetooth/glib/gio/glocalfileinfo.c

            g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH,
                                           writable && parent_info->has_trash_dir);

    => We're NOT interested in whether the specified folder can be trashed, but whether it supports thrashing its child elements! (Only support, not actual write access!)
    This renders G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH useless for this purpose.               */