/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <Kernel/Devices/HID/HIDManagement.h>
#include <Kernel/Process.h>

namespace Kernel {

constexpr size_t map_name_max_size = 50;

ErrorOr<FlatPtr> Process::sys$setkeymap(Userspace<const Syscall::SC_setkeymap_params*> user_params)
{
    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
    TRY(require_promise(Pledge::setkeymap));

    if (!is_superuser())
        return EPERM;

    auto params = TRY(copy_typed_from_user(user_params));

    Keyboard::CharacterMapData character_map_data;

    TRY(copy_n_from_user(character_map_data.map, params.map, CHAR_MAP_SIZE));
    TRY(copy_n_from_user(character_map_data.shift_map, params.shift_map, CHAR_MAP_SIZE));
    TRY(copy_n_from_user(character_map_data.alt_map, params.alt_map, CHAR_MAP_SIZE));
    TRY(copy_n_from_user(character_map_data.altgr_map, params.altgr_map, CHAR_MAP_SIZE));
    TRY(copy_n_from_user(character_map_data.shift_altgr_map, params.shift_altgr_map, CHAR_MAP_SIZE));

    auto map_name = TRY(get_syscall_path_argument(params.map_name));
    if (map_name->length() > map_name_max_size)
        return ENAMETOOLONG;

    HIDManagement::the().set_maps(move(map_name), character_map_data);
    return 0;
}

ErrorOr<FlatPtr> Process::sys$getkeymap(Userspace<const Syscall::SC_getkeymap_params*> user_params)
{
    VERIFY_NO_PROCESS_BIG_LOCK(this);
    TRY(require_promise(Pledge::getkeymap));
    auto params = TRY(copy_typed_from_user(user_params));

    auto keymap_name = TRY(KString::try_create(HIDManagement::the().keymap_name()));
    Keyboard::CharacterMapData const& character_maps = HIDManagement::the().character_map();

    TRY(copy_to_user(params.map, character_maps.map, CHAR_MAP_SIZE * sizeof(u32)));
    TRY(copy_to_user(params.shift_map, character_maps.shift_map, CHAR_MAP_SIZE * sizeof(u32)));
    TRY(copy_to_user(params.alt_map, character_maps.alt_map, CHAR_MAP_SIZE * sizeof(u32)));
    TRY(copy_to_user(params.altgr_map, character_maps.altgr_map, CHAR_MAP_SIZE * sizeof(u32)));
    TRY(copy_to_user(params.shift_altgr_map, character_maps.shift_altgr_map, CHAR_MAP_SIZE * sizeof(u32)));

    if (params.map_name.size < keymap_name->length())
        return ENAMETOOLONG;
    TRY(copy_to_user(params.map_name.data, keymap_name->characters(), keymap_name->length()));
    return 0;
}

}