/*
 * Copyright (C) 2013 Alexander Mezin <mezin.alexander@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "propertyinfo.h"

#include <QVariant>

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/XInput2.h>

void XDeleter(void* p)
{
    if (p) {
        XFree(p);
    }
}

PropertyInfo::PropertyInfo() :
    type(0), format(0), nitems(0), f(nullptr), i(nullptr), b(nullptr),
    display(nullptr), device(0), prop(0)
{
}

PropertyInfo::PropertyInfo(Display *display, int device, Atom prop, Atom floatType)
    : type(0), format(0), nitems(0), f(nullptr), i(nullptr), b(nullptr),
      display(display), device(device), prop(prop)
{
    unsigned char *dataPtr = nullptr;
    unsigned long bytes_after;
    XIGetProperty(display, device, prop, 0, 1000, False,
                    AnyPropertyType, &type, &format, &nitems,
                    &bytes_after, &dataPtr);
    data = QSharedPointer<unsigned char>(dataPtr, XDeleter);

    if (format == CHAR_BIT && type == XA_INTEGER) {
        b = reinterpret_cast<char *>(dataPtr);
    }
    if (format == sizeof(int) * CHAR_BIT &&
            (type == XA_INTEGER || type == XA_CARDINAL))
    {
        i = reinterpret_cast<int *>(dataPtr);
    }
    if (format == sizeof(float) * CHAR_BIT &&
            floatType && type == floatType)
    {
        f = reinterpret_cast<float *>(dataPtr);
    }
}

QVariant PropertyInfo::value(unsigned offset) const
{
    QVariant v;
    if (offset >= nitems) {
        return v;
    }

    if (b) {
        v = QVariant(static_cast<int>(b[offset]));
    }
    if (i) {
        v = QVariant(i[offset]);
    }
    if (f) {
        v = QVariant(f[offset]);
    }

    return v;
}

void PropertyInfo::set()
{
    XIChangeProperty(display, device, prop, type, format,
                        XIPropModeReplace, data.data(), nitems);
}