#!/usr/bin/perl -w
# $Id: x11config.pl $
## @file
# Guest Additions X11 config update script
#

#
# Copyright (C) 2006-2023 Oracle and/or its affiliates.
#
# This file is part of VirtualBox base platform packages, as
# available from https://www.virtualbox.org.
#
# 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, in version 3 of the
# License.
#
# 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, see <https://www.gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-3.0-only
#

my $temp="/tmp/xorg.conf";
my $os_type=`uname -s`;
my @cfg_files = ("/etc/X11/xorg.conf-4", "/etc/X11/xorg.conf", "/etc/X11/.xorg.conf", "/etc/xorg.conf",
                 "/usr/etc/X11/xorg.conf-4", "/usr/etc/X11/xorg.conf", "/usr/lib/X11/xorg.conf-4",
                 "/usr/lib/X11/xorg.conf", "/etc/X11/XF86Config-4", "/etc/X11/XF86Config",
                 "/etc/XF86Config", "/usr/X11R6/etc/X11/XF86Config-4", "/usr/X11R6/etc/X11/XF86Config",
                 "/usr/X11R6/lib/X11/XF86Config-4", "/usr/X11R6/lib/X11/XF86Config");
my $CFG;
my $TMP;

my $config_count = 0;

foreach $cfg (@cfg_files)
{

    if (open(CFG, $cfg))
    {
        open(TMP, ">$temp") or die "Can't create $TMP: $!\n";

        my $have_mouse = 0;
        my $in_section = 0;

        while (defined ($line = <CFG>))
        {
            if ($line =~ /^\s*Section\s*"([a-zA-Z]+)"/i)
            {
                my $section = lc($1);
                if (($section eq "inputdevice") || ($section eq "device"))
                {
                    $in_section = 1;
                }
                if ($section eq "serverlayout")
                {
                    $in_layout = 1;
                }
            } else {
                if ($line =~ /^\s*EndSection/i)
                {
                    $in_section = 0;
                    $in_layout = 0;
                }
            }

            if ($in_section)
            {
                if ($line =~ /^\s*driver\s+\"(?:mouse|vboxmouse)\"/i)
                {
                    $line = "    Driver      \"vboxmouse\"\n    Option      \"CorePointer\"\n";
                    $have_mouse = 1
                }

                # Other drivers sending events interfere badly with pointer integration
                if ($line =~ /^\s*option\s+\"(?:alwayscore|sendcoreevents|corepointer)\"/i)
                {
                    $line = "";
                }

                # Solaris specific: /dev/kdmouse for PS/2 and not /dev/mouse
                if ($os_type =~ 'SunOS')
                {
                    if ($line =~ /^\s*option\s+\"(?:device)\"\s+\"(?:\/dev\/mouse)\"/i)
                    {
                        $line = "    Option      \"Device\" \"\/dev\/kdmouse\"\n"
                    }
                }

                if ($line =~ /^\s*driver\s+\"(?:fbdev|vga|vesa|vboxvideo|ChangeMe)\"/i)
                {
                    $line = "    Driver      \"vboxvideo\"\n";
                }
            }
            if ($in_layout)
            {
                # Other drivers sending events interfere badly with pointer integration
                if (   $line =~ /^\s*inputdevice.*\"(?:alwayscore|sendcoreevents)\"/i)
                {
                    $line = "";
                }
            }
            print TMP $line;
        }

        if (!$have_mouse) {
            print TMP "\n";
            print TMP "Section \"InputDevice\"\n";
            print TMP "        Identifier  \"VBoxMouse\"\n";
            print TMP "        Driver      \"vboxmouse\"\n";
            if ($os_type eq 'SunOS')
            {
                print TMP "        Option      \"Device\"     \"\/dev\/kdmouse\"\n";
            }
            print TMP "        Option      \"CorePointer\"\n";
            print TMP "EndSection\n";
        }
        close(TMP);

        rename $cfg, $cfg.".bak";
        system("cp $temp $cfg");
        unlink $temp;

        # Solaris specific: Rename our modified .xorg.conf to xorg.conf for it to be used
        if (($os_type =~ 'SunOS') && ($cfg =~ '/etc/X11/.xorg.conf'))
        {
            system("mv -f $cfg /etc/X11/xorg.conf");
        }

        $config_count++;
    }
}

$config_count != 0 or die "Could not find any X11 configuration files";