// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

#include "commands_native.h"
#include <sys/types.h>
#include <X11/extensions/XRes.h>

int cthulhu_xres_client_pids_supported(Display *display) {
    int event, error, major = 0, minor = 0;
    cthulhu_x11_begin_read(display);
    int supported = XResQueryExtension(display, &event, &error) &&
        XResQueryVersion(display, &major, &minor) &&
        (major > 1 || (major == 1 && minor >= 2));
    if (cthulhu_x11_end_read(display)) return 0;
    return supported;
}

// _NET_WM_PID is written by the application in its own PID namespace. XRes
// identifies the local connection from the server side instead. Unsupported
// servers, remote clients and disappeared clients retain the property fallback.
int cthulhu_xres_client_pid(Display *display, Window window) {
    XResClientIdSpec spec = {.client = window, .mask = XRES_CLIENT_ID_PID_MASK};
    XResClientIdValue *ids = NULL;
    long count = 0;
    int pid = 0;
    cthulhu_x11_begin_read(display);
    if (XResQueryClientIds(display, 1, &spec, &count, &ids) == Success) {
        for (long i = 0; i < count; i++) {
            pid_t candidate = XResGetClientPid(&ids[i]);
            if (candidate > 0) {
                pid = candidate;
                break;
            }
        }
    }
    if (ids) XResClientIdsDestroy(count, ids);
    if (cthulhu_x11_end_read(display)) return 0;
    return pid;
}