use std::os::raw::c_int;

use once_cell::sync::OnceCell;

pub type xcb_connection_t = c_void;

use super::*;

pub const XKB_X11_MIN_MAJOR_XKB_VERSION: u16 = 1;
pub const XKB_X11_MIN_MINOR_XKB_VERSION: u16 = 0;

#[repr(C)]
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum xkb_x11_setup_xkb_extension_flags {
    /// Do not apply any flags.
    XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS = 0,
}

dlopen_external_library!(XkbCommonX11,
functions:
    fn xkb_x11_setup_xkb_extension(
        *mut xcb_connection_t,
        u16,
        u16,
        xkb_x11_setup_xkb_extension_flags,
        *mut u16,
        *mut u16,
        *mut u8,
        *mut u8
    ) -> c_int,
    fn xkb_x11_get_core_keyboard_device_id(*mut xcb_connection_t) -> i32,
    fn xkb_x11_keymap_new_from_device(
        *mut xkb_context,
        *mut xcb_connection_t,
        i32,
        xkb_keymap_compile_flags
    ) -> *mut xkb_keymap,
    fn xkb_x11_state_new_from_device(
        *mut xkb_keymap,
        *mut xcb_connection_t,
        i32
    ) -> *mut xkb_state,
);

pub fn xkbcommon_x11_option() -> Option<&'static XkbCommonX11> {
    static XKBCOMMON_X11_OPTION: OnceCell<Option<XkbCommonX11>> = OnceCell::new();
    XKBCOMMON_X11_OPTION
        .get_or_init(|| {
            open_with_sonames(
                &["libxkbcommon-x11.so.0", "libxkbcommon-x11.so"],
                None,
                |name| unsafe { XkbCommonX11::open(name) },
            )
        })
        .as_ref()
}

pub fn xkbcommon_x11_handle() -> &'static XkbCommonX11 {
    xkbcommon_x11_option().expect("Library libxkbcommon-x11.so could not be loaded.")
}