#!/usr/bin/perl

use strict;
use warnings;

use Getopt::Long;
use IPC::Open2;
use IO::File;
use Cwd 'abs_path';
use Glib;
use Gtk3;
use Gtk3::WebKit2;
use Encode;
use File::Basename;
use File::Path;
use Time::HiRes;
use POSIX ":sys_wait_h";

use Proxmox::Log;
Proxmox::Log::init("/tmp/install.log");

{ # NOTE: order is important here
    my $test_image;
    GetOptions(
	'test-image|t=s' => \$test_image
    ) or die "usage error\n";

    Proxmox::Install::ISOEnv::set_test_image($test_image) if $test_image;
}


use Proxmox::Install::ISOEnv;
use Proxmox::Install::RunEnv;

# init singletons
my $iso_env = Proxmox::Install::ISOEnv::get();
my $run_env = Proxmox::Install::RunEnv::get();

use Proxmox::Install::Config;
use Proxmox::Install::StorageConfig;

use Proxmox::Sys::Block qw(get_cached_disks wipe_disk partition_bootable_disk);
use Proxmox::Sys::Command qw(run_command syscmd);
use Proxmox::Sys::File qw(file_read_firstline file_read_all file_write_all);
use Proxmox::Sys::Net qw(parse_ip_address parse_ip_mask);
use Proxmox::UI;

if (!$ENV{G_SLICE} ||  $ENV{G_SLICE} ne "always-malloc") {
    die "do not use slice allocator (run with 'G_SLICE=always-malloc ./proxinstall ...')\n";
}

my $proxmox_libdir = $iso_env->{locations}->{lib};
my $proxmox_cddir = $iso_env->{locations}->{iso};
my $proxmox_pkgdir = "${proxmox_cddir}/proxmox/packages/";

my $step_number = 0; # Init number for global function list

my @steps = (
    {
	step => 'intro',
	html => 'license.htm',
	next_button => 'I a_gree',
	function => \&create_intro_view,
    },
    {
	step => 'intro',
	html => 'page1.htm',
	function => \&create_hdsel_view,
    },
    {
	step => 'country',
	html => 'country.htm',
	function => \&create_country_view,
    },
    {
	step => 'password',
	html => 'passwd.htm',
	function => \&create_password_view,
    },
    {
	step => 'ipconf',
	html => 'ipconf.htm',
	function => \&create_ipconf_view,
    },
    {
	step => 'ack',
	html => 'ack.htm',
	next_button => '_Install',
	function => \&create_ack_view,
    },
    {
	step => 'extract',
	next_button => '_Reboot',
	function => \&create_extract_view,
    },
);

# GUI global variables
my $gtk_state = {};

my $target_hd;

my $ipconf;
my $autoreboot_seconds = 5;

my $config_options = Proxmox::Install::Config::parse_kernel_cmdline();

my $postfix_main_cf = <<_EOD;
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

myhostname=__FQDN__

smtpd_banner = \$myhostname ESMTP \$mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = \$myhostname, localhost.\$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0/8
inet_interfaces = loopback-only
recipient_delimiter = +

compatibility_level = 2

_EOD


sub app_quit {
    my ($exit_code) = @_;

    Gtk3->main_quit() if Gtk3->main_level() > 0;

    # reap left over zombie processes
    while ((my $child = waitpid(-1, POSIX::WNOHANG)) > 0) {
	print STDERR "reaped child $child\n";
    }
    exit($exit_code);
}

sub update_progress {
    my ($frac, $start, $end, $text) = @_;

    my $res = Proxmox::UI::progress($frac, $start, $end, $text);

    display_info() if $res < 0.9;

    Proxmox::UI::process_events();
}

my $fssetup = {
    ext4 => {
	mkfs => 'mkfs.ext4 -F',
	mkfs_root_opt => '',
	mkfs_data_opt => '-m 0',
	root_mountopt => 'errors=remount-ro',
    },
    xfs => {
	mkfs => 'mkfs.xfs -f',
	mkfs_root_opt => '',
	mkfs_data_opt => '',
	root_mountopt => '',
    },
};

sub create_filesystem {
    my ($dev, $name, $type, $start, $end, $fs, $fe) = @_;

    my $range = $end - $start;
    my $rs = $start + $range*$fs;
    my $re = $start + $range*$fe;
    my $max = 0;

    my $fsdata = $fssetup->{$type} || die "internal error - unknown file system '$type'";
    my $opts = $name eq 'root' ? $fsdata->{mkfs_root_opt} : $fsdata->{mkfs_data_opt};

    update_progress(0, $rs, $re, "creating $name filesystem");

    run_command("$fsdata->{mkfs} $opts $dev", sub {
	my $line = shift;

	if ($line =~ m/Writing inode tables:\s+(\d+)\/(\d+)/) {
	    $max = $2;
	} elsif ($max && $line =~ m/(\d+)\/$max/) {
	    update_progress(($1/$max)*0.9, $rs, $re);
	} elsif ($line =~ m/Creating journal.*done/) {
	    update_progress(0.95, $rs, $re);
	} elsif ($line =~ m/Writing superblocks and filesystem.*done/) {
	    update_progress(1, $rs, $re);
	}
    });
}

sub debconfig_set {
    my ($targetdir, $dcdata) = @_;

    my $cfgfile = "/tmp/debconf.txt";
    file_write_all("$targetdir/$cfgfile", $dcdata);
    syscmd("chroot $targetdir debconf-set-selections $cfgfile");
    unlink "$targetdir/$cfgfile";
}

sub diversion_add {
    my ($targetdir, $cmd, $new_cmd) = @_;

    syscmd("chroot $targetdir dpkg-divert --package proxmox --add --rename $cmd") == 0
        || die "unable to exec dpkg-divert\n";

    syscmd("ln -sf ${new_cmd} $targetdir/$cmd") == 0
        || die "unable to link diversion to ${new_cmd}\n";
}

sub diversion_remove {
    my  ($targetdir, $cmd) = @_;

    syscmd("mv $targetdir/${cmd}.distrib $targetdir/${cmd};") == 0
        || die "unable to remove $cmd diversion\n";

    syscmd("chroot $targetdir dpkg-divert --remove $cmd") == 0
        || die "unable to remove $cmd diversion\n";
}

sub btrfs_create {
    my ($partitions, $mode) = @_;

    die "unknown btrfs mode '$mode'"
	if !($mode eq 'single' || $mode eq 'raid0' || $mode eq 'raid1' || $mode eq 'raid10');

    my $cmd = ['mkfs.btrfs', '-f'];

    push @$cmd, '-d', $mode, '-m', $mode;

    push @$cmd, @$partitions;

    syscmd($cmd);
}

sub zfs_create_rpool {
    my ($vdev, $pool_name, $root_volume_name) = @_;

    my $cmd = "zpool create -f -o cachefile=none";

    $cmd .= " -o ashift=$config_options->{ashift}"
        if defined($config_options->{ashift});

    syscmd("$cmd $pool_name $vdev") == 0 ||
	die "unable to create zfs root pool\n";

    syscmd("zfs create $pool_name/ROOT")  == 0 ||
        die "unable to create zfs $pool_name/ROOT volume\n";

    if ($iso_env->{product} eq 'pve') {
	syscmd("zfs create $pool_name/data")  == 0 ||
	    die "unable to create zfs $pool_name/data volume\n";
    }

    syscmd("zfs create $pool_name/ROOT/$root_volume_name")  == 0 ||
	die "unable to create zfs $pool_name/ROOT/$root_volume_name volume\n";

    # default to `relatime` on, fast enough for the installer and production
    syscmd("zfs set atime=on relatime=on $pool_name") == 0 ||
	die "unable to set zfs properties\n";

    my $value = $config_options->{compress};
    syscmd("zfs set compression=$value $pool_name")
        if defined($value) && $value ne 'off';

    $value = $config_options->{checksum};
    syscmd("zfs set checksum=$value $pool_name")
        if defined($value) && $value ne 'on';

    $value = $config_options->{copies};
    syscmd("zfs set copies=$value $pool_name")
        if defined($value) && $value != 1;
}

sub get_pv_list_from_vgname {
    my ($vgname) = @_;

    my $res;

    my $parser = sub {
	my $line = shift;
	$line =~ s/^\s+//;
	$line =~ s/\s+$//;
	return if !$line;
	my ($pv, $vg_uuid) = split(/\s+/, $line);

	if (!defined($res->{$vg_uuid}->{pvs})) {
	    $res->{$vg_uuid}->{pvs} = "$pv";
	} else {
	    $res->{$vg_uuid}->{pvs} .= ", $pv";
	}
    };
    run_command("pvs --noheadings -o pv_name,vg_uuid -S vg_name='$vgname'", $parser, undef, 1);

    return $res;
}

sub ask_existing_vg_rename_or_abort {
    my ($vgname) = @_;

    # this normally only happens if one put a disk with a PVE installation in
    # this server and that disk is not the installation target.
    my $duplicate_vgs = get_pv_list_from_vgname($vgname);
    return if !$duplicate_vgs;

    my $message = "Detected existing '$vgname' Volume Group(s)! Do you want to:\n";

    for my $vg_uuid (keys %$duplicate_vgs) {
	my $vg = $duplicate_vgs->{$vg_uuid};

	# no high randomnes properties, but this is only for the cases where
	# we either have multiple "$vgname" vgs from multiple old PVE disks, or
	# we have a disk with both a "$vgname" and "$vgname-old"...
	my $short_uid = sprintf "%08X", rand(0xffffffff);
	$vg->{new_vgname} = "$vgname-OLD-$short_uid";

	$message .= "rename VG backed by PV '$vg->{pvs}' to '$vg->{new_vgname}'\n";
    }
    $message .= "or cancel the installation?";

    my $response = Proxmox::UI::prompt($message);

    if ($response eq 'ok') {
	for my $vg_uuid (keys %$duplicate_vgs) {
	    my $vg = $duplicate_vgs->{$vg_uuid};
	    my $new_vgname = $vg->{new_vgname};

	    syscmd("vgrename $vg_uuid $new_vgname") == 0 ||
		die "could not rename VG from '$vg->{pvs}' ($vg_uuid) to '$new_vgname'!\n";
	}
    } else {
	warn "Canceled installation by user, due to already existing volume group '$vgname'\n";
	die "\n"; # causes abort without re-showing an error dialogue
    }
}

sub create_lvm_volumes {
    my ($lvmdev, $os_size, $swap_size) = @_;

    my $vgname = $iso_env->{product};

    ask_existing_vg_rename_or_abort($vgname);

    my $rootdev = "/dev/$vgname/root";
    my $datadev = "/dev/$vgname/data";
    my $swapfile;

    # we use --metadatasize 250k, which results in "pe_start = 512"
    # so pe_start is aligned on a 128k boundary (advantage for SSDs)
    syscmd("/sbin/pvcreate --metadatasize 250k -y -ff $lvmdev") == 0 ||
	die "unable to initialize physical volume $lvmdev\n";
    syscmd("/sbin/vgcreate $vgname $lvmdev") == 0 ||
	die "unable to create volume group '$vgname'\n";

    my $hdgb = int($os_size / (1024 * 1024));

    # always leave some space at the end to avoid roudning issues with LVM's physical extent (PE)
    # size of 4 MB.
    my $space = $hdgb <= 32 ? 4 * 1024 : (($hdgb > 128 ? 16 : $hdgb / 8) * 1024 * 1024);

    my $rootsize;
    my $datasize = 0;

    if ($iso_env->{product} eq 'pve') {

	my $maxroot_mb;
	if (my $maxroot = Proxmox::Install::Config::get_maxroot()) {
	    $maxroot_mb = $maxroot * 1024;
	} else {
	    $maxroot_mb = 96 * 1024;
	}

	my $rest = $os_size - $swap_size;
	my $rest_mb = int($rest / 1024);

	my $rootsize_mb;
	if ($rest_mb < 12 * 1024) {
	    # no point in wasting space, try to get us actually installed and align down to 4 MB
	    $rootsize_mb = ($rest_mb - 0.1) & ~3;
	} elsif ($rest_mb < 48 * 1024) {
	    my $masked = int($rest_mb / 2) & ~3; # align down to 4 MB
	    $rootsize_mb = $masked;
	} else {
	    $rootsize_mb = $rest_mb / 4 + 12 * 1024;
	}

	$rootsize_mb = $maxroot_mb if $rootsize_mb > $maxroot_mb;
	$rootsize = int($rootsize_mb * 1024);

	$rest -= $rootsize; # in KB

	my $minfree = $space;
	if (defined(my $cfg_minfree = Proxmox::Install::Config::get_minfree())) {
	    $minfree = $cfg_minfree * 1024 * 1024 >= $rest ? $space : $cfg_minfree * 1024 * 1024;
	}

	$rest = int($rest - $minfree) & ~0xFFF; # align down to 4 MB boundaries

	if (defined(my $maxvz = Proxmox::Install::Config::get_maxvz())) {
	    $rest = $maxvz * 1024 * 1024 <= $rest ? $maxvz * 1024 * 1024 : $rest;
	}

	$datasize = $rest;

    } else {
	my $cfg_minfree = Proxmox::Install::Config::get_minfree();
	my $minfree = defined($cfg_minfree) ? $cfg_minfree * 1024 * 1024 : $space;
	$rootsize = int($os_size - $minfree - $swap_size); # in KB
	$rootsize &= ~0xFFF; # align down to 4 MB boundaries
    }

    if ($swap_size) {
	syscmd("/sbin/lvcreate -Wy --yes -L${swap_size}K -nswap $vgname") == 0 ||
	    die "unable to create swap volume\n";

	$swapfile = "/dev/$vgname/swap";
    }

    syscmd("/sbin/lvcreate -Wy --yes -L${rootsize}K -nroot $vgname") == 0 ||
	die "unable to create root volume\n";

    if ($datasize > 4 * 1024 * 1024) {
	my $metadatasize = $datasize/100; # default 1% of data
	$metadatasize = 1024*1024 if $metadatasize < 1024*1024; # but at least 1G
	$metadatasize = 16*1024*1024 if $metadatasize > 16*1024*1024; # but at most 16G

	# otherwise the metadata is taken out of $minfree
	$datasize -= 2 * $metadatasize;

	# 1 4MB PE to allow for rounding
	$datasize -= 4 * 1024;

	syscmd("/sbin/lvcreate -Wy --yes -L${datasize}K -ndata $vgname") == 0 ||
	    die "unable to create data volume\n";

	syscmd("/sbin/lvconvert --yes --type thin-pool --poolmetadatasize ${metadatasize}K $vgname/data") == 0 ||
	    die "unable to create data thin-pool\n";
    } else {
	my $maxvz = Proxmox::Install::Config::get_maxvz();
	if ($iso_env->{product} eq 'pve' && !defined($maxvz)) {
	    Proxmox::UI::message("Skipping auto-creation of LVM thinpool for guest data due to low space.");
	}
	$datadev = undef;
    }

    syscmd("/sbin/vgchange -a y $vgname") == 0 ||
	die "unable to activate volume group\n";

    return ($rootdev, $swapfile, $datadev);
}

sub compute_swapsize {
    my ($hdsize) = @_;

    my $hdgb = int($hdsize/(1024*1024));

    my $swapsize_kb;
    if (defined(my $swapsize = Proxmox::Install::Config::get_swapsize())) {
	$swapsize_kb = $swapsize * 1024 * 1024;
    } else {
	my $ss = int($run_env->{total_memory});
	$ss = 4096 if $ss < 4096 && $hdgb >= 64;
	$ss = 2048 if $ss < 2048 && $hdgb >= 32;
	$ss = 1024 if $ss >= 2048 && $hdgb <= 16;
	$ss = 512 if $ss < 512;
	$ss = int($hdgb * 128) if $ss > $hdgb * 128;
	$ss = 8192 if $ss > 8192;
	$swapsize_kb = int($ss * 1024) & ~0xFFF; # align to 4 MB to avoid all to odd SWAP size
    }

    return $swapsize_kb;
}

my sub chroot_chown {
    my ($root, $path, %param) = @_;

    my $recursive = $param{recursive} ? ' -R' : '';
    my $user = $param{user};
    die "can not chown without user parameter\n" if !defined($user);
    my $group = $param{group} // $user;

    syscmd("chroot $root /bin/chown $user:$group $recursive $path") == 0 ||
	die "chroot: unable to change owner for '$path'\n";
}

my sub chroot_chmod {
    my ($root, $path, %param) = @_;

    my $recursive = $param{recursive} ? ' -R' : '';
    my $mode = $param{mode};
    die "can not chmod without mode parameter\n" if !defined($mode);

    syscmd("chroot $root /bin/chmod $mode $recursive $path") == 0 ||
	die "chroot: unable to change permission mode for '$path'\n";
}

sub prepare_proxmox_boot_esp {
    my ($espdev, $targetdir) = @_;

    syscmd("chroot $targetdir proxmox-boot-tool init $espdev") == 0 ||
	die "unable to init ESP and install proxmox-boot loader on '$espdev'\n";
}

sub prepare_grub_efi_boot_esp {
    my ($dev, $espdev, $targetdir) = @_;

    syscmd("mount -n $espdev -t vfat $targetdir/boot/efi") == 0 ||
	die "unable to mount $espdev\n";

    eval {
	my $rc = syscmd("chroot $targetdir /usr/sbin/grub-install --target x86_64-efi --no-floppy --bootloader-id='proxmox' $dev");
	if ($rc != 0) {
	    if ($run_env->{boot_type} eq 'efi') {
		die "unable to install the EFI boot loader on '$dev'\n";
	    } else {
		warn "unable to install the EFI boot loader on '$dev', ignoring (not booted using UEFI)\n";
	    }
	}
	# also install fallback boot file (OVMF does not boot without)
	mkdir("$targetdir/boot/efi/EFI/BOOT");
	syscmd("cp $targetdir/boot/efi/EFI/proxmox/grubx64.efi $targetdir/boot/efi/EFI/BOOT/BOOTx64.EFI") == 0 ||
	    die "unable to copy efi boot loader\n";
    };
    my $err = $@;

    eval {
	syscmd("umount $targetdir/boot/efi") == 0 ||
	    die "unable to umount $targetdir/boot/efi\n";
    };
    warn $@ if $@;

    die "failed to prepare EFI boot using Grub on '$espdev': $err" if $err;
}

sub extract_data {
    my ($basefile, $targetdir) = @_;

    die "target '$targetdir' does not exist\n" if ! -d  $targetdir;

    my $starttime = [Time::HiRes::gettimeofday];

    my $bootdevinfo = [];

    my ($swapfile, $rootdev, $datadev);
    my ($use_zfs, $use_btrfs) = (0, 0);

    my $filesys = Proxmox::Install::Config::get_filesys();
    my $hdsize = Proxmox::Install::Config::get_hdsize();

    my $zfs_pool_name = Proxmox::Install::StorageConfig::get_zfs_pool_name();
    my $zfs_root_volume_name = Proxmox::Install::StorageConfig::get_zfs_root_volume_name();

    if ($filesys =~ m/zfs/) {
	$target_hd = undef; # do not use this config
	$use_zfs = 1;
	$targetdir = "/$zfs_pool_name/ROOT/$zfs_root_volume_name";
    } elsif ($filesys =~ m/btrfs/) {
	$target_hd = undef; # do not use this config
	$use_btrfs = 1;
    }

    if ($use_zfs) {
	my $i;
	for ($i = 5; $i > 0; $i--) {
	    syscmd("modprobe zfs");
	    last if -c "/dev/zfs";
	    sleep(1);
	}

	die "unable to load zfs kernel module\n" if !$i;
    }

    my $bootloader_err;

    eval {
	my $maxper = 0.25;

	update_progress(0, 0, $maxper, "cleanup root-disks");

	syscmd("vgchange -an") if !is_test_mode(); # deactivate all detected VGs

	if (is_test_mode()) {

	    my $test_images = Proxmox::Install::ISOEnv::get_test_images();
	    $rootdev = abs_path($test_images->[0]); # FIXME: use all selected for test too!
	    syscmd("umount $rootdev");

	    if ($use_btrfs) {

		die "unsupported btrfs mode (for testing environment)\n"
		    if $filesys ne 'btrfs (RAID0)';

		btrfs_create([$rootdev], 'single');

	    } elsif ($use_zfs) {

		die "unsupported zfs mode (for testing environment)\n"
		    if $filesys ne 'zfs (RAID0)';

		syscmd("zpool destroy $zfs_pool_name");

		zfs_create_rpool($rootdev, $zfs_pool_name, $zfs_root_volume_name);

	    } else {

		# nothing to do
	    }

	} elsif ($use_btrfs) {

	    my ($devlist, $btrfs_mode) = get_btrfs_raid_setup();

	    foreach my $hd (@$devlist) {
		wipe_disk(@$hd[1]);
	    }

	    update_progress(0, 0.02, $maxper, "create partitions");

	    my $btrfs_partitions = [];
	    foreach my $hd (@$devlist) {
		my $devname = @$hd[1];
		my $logical_bsize = @$hd[4];

		my ($size, $osdev, $efidev) = partition_bootable_disk($devname, $hdsize, '8300');
		$rootdev = $osdev if !defined($rootdev); # simply point to first disk
		my $by_id = Proxmox::Sys::Block::get_disk_by_id_path($devname);
		push @$bootdevinfo, {
		    esp => $efidev,
		    devname => $devname,
		    osdev => $osdev,
		    by_id => $by_id,
		    logical_bsize => $logical_bsize,
		};
		push @$btrfs_partitions, $osdev;
	    }

	    Proxmox::Sys::Block::udevadm_trigger_block();

	    update_progress(0, 0.03, $maxper, "create btrfs");

	    btrfs_create($btrfs_partitions, $btrfs_mode);

	} elsif ($use_zfs) {

	    my ($devlist, $vdev) = get_zfs_raid_setup();

	    foreach my $hd (@$devlist) {
		wipe_disk(@$hd[1]);
	    }

	    update_progress(0, 0.02, $maxper, "create partitions");

	    # install esp/boot part on all, we can only win!
	    for my $hd (@$devlist) {
		my $devname = @$hd[1];
		my $logical_bsize = @$hd[4];

		my ($size, $osdev, $efidev) = partition_bootable_disk($devname, $hdsize, 'BF01');

		push @$bootdevinfo, {
		    esp => $efidev,
		    devname => $devname,
		    osdev => $osdev,
		    logical_bsize => $logical_bsize,
		};
	    }

	    Proxmox::Sys::Block::udevadm_trigger_block();

	    foreach my $di (@$bootdevinfo) {
		my $devname = $di->{devname};
		$di->{by_id} = Proxmox::Sys::Block::get_disk_by_id_path($devname);

		my $osdev = Proxmox::Sys::Block::get_disk_by_id_path($di->{osdev}) || $di->{osdev};

		$vdev =~ s/ $devname/ $osdev/;
	    }

	    foreach my $hd (@$devlist) {
		my $devname = @$hd[1];
		my $by_id = Proxmox::Sys::Block::get_disk_by_id_path($devname);

		$vdev =~ s/ $devname/ $by_id/ if $by_id;
	    }

	    update_progress(0, 0.03, $maxper, "create rpool");

	    zfs_create_rpool($vdev, $zfs_pool_name);

	} else {

	    die "target '$target_hd' is not a valid block device\n" if ! -b $target_hd;

	    wipe_disk($target_hd);

	    update_progress(0, 0.02, $maxper, "create partitions");

	    my $logical_bsize = Proxmox::Sys::Block::logical_blocksize($target_hd);

	    my ($os_size, $osdev, $efidev) = partition_bootable_disk($target_hd, $hdsize, '8E00');

	    Proxmox::Sys::Block::udevadm_trigger_block();

	    my $by_id = Proxmox::Sys::Block::get_disk_by_id_path($target_hd);
	    push @$bootdevinfo, {
		esp => $efidev,
		devname => $target_hd,
		osdev => $osdev,
		by_id => $by_id,
		logical_bsize => $logical_bsize,
	    };

	    update_progress(0, 0.03, $maxper, "create LVs");

	    my $swap_size = compute_swapsize($os_size);
	    ($rootdev, $swapfile, $datadev) =
		create_lvm_volumes($osdev, $os_size, $swap_size);

	    # trigger udev to create /dev/disk/by-uuid
	    Proxmox::Sys::Block::udevadm_trigger_block(1);
	}

	if ($use_zfs) {
	    # to be fast during installation
	    syscmd("zfs set sync=disabled $zfs_pool_name") == 0 ||
		die "unable to set zfs properties\n";
	}

	update_progress(0.04, 0, $maxper, "create swap space");
	if ($swapfile) {
	    syscmd("mkswap -f $swapfile") == 0 ||
		die "unable to create swap space\n";
	}

	update_progress(0.045, 0, $maxper, "creating root filesystems");

	foreach my $di (@$bootdevinfo) {
	    next if !$di->{esp};
	    # FIXME remove '-s1' once https://github.com/dosfstools/dosfstools/issues/111 is fixed
	    my $vfat_extra_opts = ($di->{logical_bsize} == 4096) ? '-s1' : '';
	    syscmd("mkfs.vfat $vfat_extra_opts -F32 $di->{esp}") == 0 ||
		die "unable to initialize EFI ESP on device $di->{esp}\n";
	}

	if ($use_zfs) {
	    # do nothing
	} elsif ($use_btrfs) {
	    # do nothing
	} else {
	    create_filesystem($rootdev, 'root', $filesys, 0.05, $maxper, 0, 1);
	}

	update_progress(1, 0.05, $maxper, "mounting target $rootdev");

	if ($use_zfs) {
	    # do nothing
	} else {
	    my $mount_opts = 'noatime';
	    $mount_opts .= ',nobarrier'
		if $use_btrfs || $filesys =~ /^ext\d$/;

	    syscmd("mount -n $rootdev -o $mount_opts $targetdir") == 0 ||
		die "unable to mount $rootdev\n";
	}

	mkdir "$targetdir/boot";
	mkdir "$targetdir/boot/efi";

	mkdir "$targetdir/var";
	mkdir "$targetdir/var/lib";

	if ($iso_env->{product} eq 'pve') {
	    mkdir "$targetdir/var/lib/vz";
	    mkdir "$targetdir/var/lib/pve";

	    if ($use_btrfs) {
		syscmd("btrfs subvolume create $targetdir/var/lib/pve/local-btrfs") == 0 ||
		    die "unable to create btrfs subvolume\n";
	    }
	}

	mkdir "$targetdir/mnt";
	mkdir "$targetdir/mnt/hostrun";
	syscmd("mount --bind /run $targetdir/mnt/hostrun") == 0 ||
	    die "unable to bindmount run on $targetdir/mnt/hostrun\n";

	update_progress(1, 0.05, $maxper, "extracting base system");

	my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size) = stat ($basefile);
	$ino || die "unable to open file '$basefile' - $!\n";

	my $files = file_read_firstline("${proxmox_cddir}/proxmox/$iso_env->{product}-base.cnt") ||
	    die "unable to read base file count\n";

	my $per = 0;
	my $count = 0;

	run_command("unsquashfs -f -dest $targetdir -i $basefile", sub {
	    my $line = shift;
	    return if $line !~ m/^$targetdir/;
	    $count++;
	    my $nper = int (($count *100)/$files);
	    if ($nper != $per) {
		$per = $nper;
		my $frac = $per > 100 ? 1 : $per/100;
		update_progress($frac, $maxper, 0.5);
	    }
	});

	syscmd("mount -n -t tmpfs tmpfs $targetdir/tmp") == 0 || die "unable to mount tmpfs on $targetdir/tmp\n";

	mkdir "$targetdir/tmp/pkg";
	syscmd("mount -n --bind '$proxmox_pkgdir' '$targetdir/tmp/pkg'") == 0
	    || die "unable to bind-mount packages on $targetdir/tmp/pkg\n";
	syscmd("mount -n -t proc proc $targetdir/proc") == 0 || die "unable to mount proc on $targetdir/proc\n";
	syscmd("mount -n -t sysfs sysfs $targetdir/sys") == 0 || die "unable to mount sysfs on $targetdir/sys\n";
	if ($run_env->{boot_type} eq 'efi') {
	    syscmd("mount -n -t efivarfs efivarfs $targetdir/sys/firmware/efi/efivars") == 0 ||
		die "unable to mount efivarfs on $targetdir/sys/firmware/efi/efivars: $!\n";
	}
	syscmd("chroot $targetdir mount --bind /mnt/hostrun /run") == 0 ||
	    die "unable to re-bindmount hostrun on /run in chroot\n";

	update_progress(1, $maxper, 0.5, "configuring base system");

	# configure hosts
	my $hostname = Proxmox::Install::Config::get_hostname();
	my $domain = Proxmox::Install::Config::get_domain();
	my $ip_addr = Proxmox::Install::Config::get_ip_addr();

	my $hosts =
	    "127.0.0.1 localhost.localdomain localhost\n" .
	    "$ip_addr $hostname.$domain $hostname\n\n" .
	    "# The following lines are desirable for IPv6 capable hosts\n\n" .
	    "::1     ip6-localhost ip6-loopback\n" .
	    "fe00::0 ip6-localnet\n" .
	    "ff00::0 ip6-mcastprefix\n" .
	    "ff02::1 ip6-allnodes\n" .
	    "ff02::2 ip6-allrouters\n" .
	    "ff02::3 ip6-allhosts\n";

	file_write_all("$targetdir/etc/hosts", $hosts);

	file_write_all("$targetdir/etc/hostname", "$hostname\n");

	syscmd("/bin/hostname $hostname") if !is_test_mode();

	# configure interfaces

	my $ifaces = "auto lo\niface lo inet loopback\n\n";

	my $ip_version = Proxmox::Install::Config::get_ip_version();
	my $ntype = $ip_version == 4 ? 'inet' : 'inet6';

	my $ethdev = Proxmox::Install::Config::get_mngmt_nic();
	my $cidr = Proxmox::Install::Config::get_cidr();
	my $gateway = Proxmox::Install::Config::get_gateway();

	if ($iso_env->{cfg}->{bridged_network}) {
	    $ifaces .= "iface $ethdev $ntype manual\n";

	    $ifaces .=
		"\nauto vmbr0\niface vmbr0 $ntype static\n" .
		"\taddress $cidr\n" .
		"\tgateway $gateway\n" .
		"\tbridge-ports $ethdev\n" .
		"\tbridge-stp off\n" .
		"\tbridge-fd 0\n";
	} else {
	    $ifaces .= "auto $ethdev\n" .
		"iface $ethdev $ntype static\n" .
		"\taddress $cidr\n" .
		"\tgateway $gateway\n";
	}

	foreach my $iface (sort keys %{$ipconf->{ifaces}}) {
	    my $name = $ipconf->{ifaces}->{$iface}->{name};
	    next if $name eq $ethdev;

	    $ifaces .= "\niface $name $ntype manual\n";
	}

	file_write_all("$targetdir/etc/network/interfaces", $ifaces);

	# configure dns

	my $dnsserver = Proxmox::Install::Config::get_dns();
	my $resolvconf = "search $domain\nnameserver $dnsserver\n";
	file_write_all("$targetdir/etc/resolv.conf", $resolvconf);

	# configure fstab

	my $fstab = "# <file system> <mount point> <type> <options> <dump> <pass>\n";

	if ($use_zfs) {
	    # do nothing
	} elsif ($use_btrfs) {
	    my $fsuuid;
	    my $cmd = "blkid -u filesystem -t TYPE=btrfs -o export $rootdev";
	    run_command($cmd, sub {
		my $line = shift;

		if ($line =~ m/^UUID=([A-Fa-f0-9\-]+)$/) {
		    $fsuuid = $1;
		}
	    });

	    die "unable to detect FS UUID" if !defined($fsuuid);

	    $fstab .= "UUID=$fsuuid / btrfs defaults 0 1\n";
	} else {
	    my $root_mountopt = $fssetup->{$filesys}->{root_mountopt} || 'defaults';
	    $fstab .= "$rootdev / $filesys ${root_mountopt} 0 1\n";
	}

	# mount /boot/efi
	# Note: this is required by current grub, but really dangerous, because
	# vfat does not have journaling, so it triggers manual fsck after each crash
	# so we only mount /boot/efi if really required (efi systems).
	if ($run_env->{boot_type} eq 'efi' && !$use_zfs) {
	    if (scalar(@$bootdevinfo)) {
		my $di = @$bootdevinfo[0]; # simply use first disk

		if ($di->{esp}) {
		    my $efi_boot_uuid = $di->{esp};
		    if (my $uuid = Proxmox::Sys::Block::get_dev_uuid($di->{esp})) {
			$efi_boot_uuid = "UUID=$uuid";
		    }

		    $fstab .= "${efi_boot_uuid} /boot/efi vfat defaults 0 1\n";
		}
	    }
	}


	$fstab .= "$swapfile none swap sw 0 0\n" if $swapfile;

	$fstab .= "proc /proc proc defaults 0 0\n";

	file_write_all("$targetdir/etc/fstab", $fstab);
	file_write_all("$targetdir/etc/mtab", "");

	syscmd("cp ${proxmox_libdir}/policy-disable-rc.d $targetdir/usr/sbin/policy-rc.d") == 0 ||
		die "unable to copy policy-rc.d\n";
	syscmd("cp ${proxmox_libdir}/fake-start-stop-daemon $targetdir/sbin/") == 0 ||
		die "unable to copy start-stop-daemon\n";

	diversion_add($targetdir, "/sbin/start-stop-daemon", "/sbin/fake-start-stop-daemon");
	diversion_add($targetdir, "/usr/sbin/update-grub", "/bin/true");
	diversion_add($targetdir, "/usr/sbin/update-initramfs", "/bin/true");

	my $machine_id = run_command("systemd-id128 new");
	die "unable to create a new machine-id\n" if ! $machine_id;
	file_write_all("$targetdir/etc/machine-id", $machine_id);

	syscmd("cp /etc/hostid $targetdir/etc/") == 0 ||
	    die "unable to copy hostid\n";

	syscmd("touch  $targetdir/proxmox_install_mode");

	my $grub_install_devices_txt = '';
	foreach my $di (@$bootdevinfo) {
	    $grub_install_devices_txt .= ', ' if $grub_install_devices_txt;
	    $grub_install_devices_txt .= $di->{by_id} || $di->{devname};
	}

	my $keymap = Proxmox::Install::Config::get_keymap();
	# Note: keyboard-configuration/xbkb-keymap is used by console-setup
	my $xkmap = $iso_env->{locales}->{kmap}->{$keymap}->{x11} // 'us';

	debconfig_set ($targetdir, <<_EOD);
locales locales/default_environment_locale select en_US.UTF-8
locales locales/locales_to_be_generated select en_US.UTF-8 UTF-8
samba-common samba-common/dhcp boolean false
samba-common samba-common/workgroup string WORKGROUP
postfix postfix/main_mailer_type select No configuration
keyboard-configuration keyboard-configuration/xkb-keymap select $xkmap
d-i debian-installer/locale select en_US.UTF-8
grub-pc grub-pc/install_devices select $grub_install_devices_txt
_EOD

	my $pkg_count = 0;
	while (<${proxmox_pkgdir}/*.deb>) { $pkg_count++ };

	# btrfs/dpkg is extremely slow without --force-unsafe-io
	my $dpkg_opts = $use_btrfs ? "--force-unsafe-io" : "";

	$count = 0;
	while (<${proxmox_pkgdir}/*.deb>) {
	    chomp;
	    my $path = $_;
	    my ($deb) = $path =~ m/${proxmox_pkgdir}\/(.*\.deb)/;
	    update_progress($count/$pkg_count, 0.5, 0.75, "extracting $deb");
	    print STDERR "extracting: $deb\n";
	    syscmd("chroot $targetdir dpkg $dpkg_opts --force-depends --no-triggers --unpack /tmp/pkg/$deb") == 0
		|| die "installation of package $deb failed\n";
	    update_progress((++$count)/$pkg_count, 0.5, 0.75);
	}

	# needed for postfix postinst in case no other NIC is active
	syscmd("chroot $targetdir ifup lo");

	my $cmd = "chroot $targetdir dpkg $dpkg_opts --force-confold --configure -a";
	$count = 0;
	run_command($cmd, sub {
	    my $line = shift;
	    if ($line =~ m/Setting up\s+(\S+)/) {
		update_progress((++$count)/$pkg_count, 0.75, 0.95, "configuring $1");
	    }
	});

	unlink "$targetdir/etc/mailname";
	$postfix_main_cf =~ s/__FQDN__/${hostname}.${domain}/;
	file_write_all("$targetdir/etc/postfix/main.cf", $postfix_main_cf);

	# make sure we have all postfix directories
	syscmd("chroot $targetdir /usr/sbin/postfix check");
	# cleanup mail queue
	syscmd("chroot $targetdir /usr/sbin/postsuper -d ALL");
	# create /etc/aliases.db (/etc/aliases is shipped in the base squashfs)
	syscmd("chroot $targetdir /usr/bin/newaliases");

	unlink  "$targetdir/proxmox_install_mode";

	my $country = Proxmox::Install::Config::get_country();
	my $timezone = Proxmox::Install::Config::get_timezone();

	# set timezone
	unlink ("$targetdir/etc/localtime");
	symlink ("/usr/share/zoneinfo/$timezone", "$targetdir/etc/localtime");
	file_write_all("$targetdir/etc/timezone", "$timezone\n");

	# set apt mirror
	if (my $mirror = $iso_env->{locales}->{country}->{$country}->{mirror}) {
	    my $fn = "$targetdir/etc/apt/sources.list";
	    syscmd("sed -i 's/ftp\\.debian\\.org/$mirror/' '$fn'");
	}

	# create extended_states for apt (avoid cron job warning if that
	# file does not exist)
	file_write_all("$targetdir/var/lib/apt/extended_states", '');

	# allow ssh root login
	syscmd(['sed', '-i', 's/^#\?PermitRootLogin.*/PermitRootLogin yes/', "$targetdir/etc/ssh/sshd_config"]);

	if ($iso_env->{product} eq 'pmg') {
	    # install initial clamav DB
	    my $srcdir = "${proxmox_cddir}/proxmox/clamav";
	    foreach my $fn ("main.cvd", "bytecode.cvd", "daily.cvd", "safebrowsing.cvd") {
		syscmd("cp \"$srcdir/$fn\" \"$targetdir/var/lib/clamav\"") == 0 ||
		    die "installation of clamav db file '$fn' failed\n";
	    }
	    syscmd("chroot $targetdir /bin/chown clamav:clamav -R /var/lib/clamav") == 0 ||
		die "unable to set owner for clamav database files\n";
	}

	if ($iso_env->{product} eq 'pve') {
	    # save installer settings
	    my $ucc = uc ($country);
	    debconfig_set($targetdir, "pve-manager pve-manager/country string $ucc\n");
	}

	update_progress(0.8, 0.95, 1, "make system bootable");

	if ($use_zfs) {
	    # add ZFS options while preserving existing kernel cmdline
	    my $zfs_snippet = "GRUB_CMDLINE_LINUX=\"\$GRUB_CMDLINE_LINUX root=ZFS=$zfs_pool_name/ROOT/$zfs_root_volume_name boot=zfs\"";
	    file_write_all("$targetdir/etc/default/grub.d/zfs.cfg", $zfs_snippet);

	    file_write_all("$targetdir/etc/kernel/cmdline", "root=ZFS=$zfs_pool_name/ROOT/$zfs_root_volume_name boot=zfs\n");

	}

	diversion_remove($targetdir, "/usr/sbin/update-grub");
	diversion_remove($targetdir, "/usr/sbin/update-initramfs");

	my $kapi;
	foreach my $fn (<$targetdir/lib/modules/*>) {
	    if ($fn =~ m!/(\d+\.\d+\.\d+-\d+-pve)$!) {
		die "found multiple kernels\n" if defined($kapi);
		$kapi = $1;
	    }
	}
	die "unable to detect kernel version\n" if !defined($kapi);

	if (!is_test_mode()) {

	    unlink ("$targetdir/etc/mtab");
	    symlink ("/proc/mounts", "$targetdir/etc/mtab");
	    syscmd("mount -n --bind /dev $targetdir/dev");

	    my $bootloader_err_list = [];
	    eval {
		syscmd("chroot $targetdir /usr/sbin/update-initramfs -c -k $kapi") == 0 ||
		    die "unable to install initramfs\n";

		my $native_4k_disk_bootable = 0;
		foreach my $di (@$bootdevinfo) {
		    $native_4k_disk_bootable |= ($di->{logical_bsize} == 4096);
		}

		foreach my $di (@$bootdevinfo) {
		    my $dev = $di->{devname};
		    if ($use_zfs) {
			prepare_proxmox_boot_esp($di->{esp}, $targetdir);
		    } else {
			if (!$native_4k_disk_bootable) {
			    eval {
				syscmd("chroot $targetdir /usr/sbin/grub-install --target i386-pc --no-floppy --bootloader-id='proxmox' $dev") == 0 ||
					die "unable to install the i386-pc boot loader on '$dev'\n";
			    };
			    push @$bootloader_err_list, $@ if $@;
			}

			if (my $esp = $di->{esp}) {
			    eval { prepare_grub_efi_boot_esp($dev, $esp, $targetdir) };
			    push @$bootloader_err_list, $@ if $@;
			}
		    }
		}

		syscmd("chroot $targetdir /usr/sbin/update-grub") == 0 ||
		    die "unable to update boot loader config\n";
	    };
	    push @$bootloader_err_list, $@ if $@;

	    if (scalar(@$bootloader_err_list) > 0) {
		$bootloader_err = "bootloader setup errors:\n";
		map { $bootloader_err .= "- $_" } @$bootloader_err_list;
		warn $bootloader_err;
	    }

	    syscmd("umount $targetdir/dev");
	}

	# cleanup

	unlink "$targetdir/usr/sbin/policy-rc.d";

	diversion_remove($targetdir, "/sbin/start-stop-daemon");

	# set root password
	my $octets = encode("utf-8", Proxmox::Install::Config::get_password());
	run_command("chroot $targetdir /usr/sbin/chpasswd", undef, "root:$octets\n");

	my $mailto = Proxmox::Install::Config::get_mailto();
	if ($iso_env->{product} eq 'pmg') {
	    # save admin email
	    file_write_all("$targetdir/etc/pmg/pmg.conf", "section: admin\n\temail ${mailto}\n");

	} elsif ($iso_env->{product} eq 'pve') {

	    # create pmxcfs DB

	    my $tmpdir = "$targetdir/tmp/pve";
	    mkdir $tmpdir;

	    # write vnc keymap to datacenter.cfg
	    my $vnckmap = $iso_env->{locales}->{kmap}->{$keymap}->{kvm} || 'en-us';
	    file_write_all("$tmpdir/datacenter.cfg", "keyboard: $vnckmap\n");

	    # save admin email
	    file_write_all("$tmpdir/user.cfg", "user:root\@pam:1:0:::${mailto}::\n");

	    # write storage.cfg
	    my $storage_cfg;
	    if ($use_zfs) {
		$storage_cfg = Proxmox::Install::StorageConfig::get_zfs_config($iso_env);
	    } elsif ($use_btrfs) {
		$storage_cfg = Proxmox::Install::StorageConfig::get_btrfs_config();
	    } elsif ($datadev) {
		$storage_cfg = Proxmox::Install::StorageConfig::get_lvm_thin_config();
	    } else {
		$storage_cfg = Proxmox::Install::StorageConfig::get_local_config();
	    }
	    file_write_all("$tmpdir/storage.cfg", $storage_cfg);

	    run_command("chroot $targetdir /usr/bin/create_pmxcfs_db /tmp/pve /var/lib/pve-cluster/config.db");

	    syscmd("rm -rf $tmpdir");
	} elsif ($iso_env->{product} eq 'pbs') {
	    my $base_cfg_path = "/etc/proxmox-backup";
	    mkdir "$targetdir/$base_cfg_path";

	    chroot_chown($targetdir, $base_cfg_path, user => 'backup', recursive => 1);
	    chroot_chmod($targetdir, $base_cfg_path, mode => '0700');

	    my $user_cfg_fn = "$base_cfg_path/user.cfg";
	    file_write_all("$targetdir/$user_cfg_fn", "user: root\@pam\n\temail ${mailto}\n");
	    chroot_chown($targetdir, $user_cfg_fn, user => 'root', group => 'backup');
	    chroot_chmod($targetdir, $user_cfg_fn, mode => '0640');
	}
    };

    my $err = $@;

    update_progress(1, 0, 1, "");

    print STDERR $err if $err && $err ne "\n";

    if (is_test_mode()) {
	my $elapsed = Time::HiRes::tv_interval($starttime);
	print STDERR "Elapsed extract time: $elapsed\n";

	syscmd("chroot $targetdir /usr/bin/dpkg-query -W --showformat='\${package}\n'> final.pkglist");
    }

    syscmd("umount $targetdir/run");
    syscmd("umount $targetdir/mnt/hostrun");
    syscmd("umount $targetdir/tmp/pkg");
    syscmd("umount $targetdir/tmp");
    syscmd("umount $targetdir/proc");
    syscmd("umount $targetdir/sys/firmware/efi/efivars");
    syscmd("umount $targetdir/sys");
    rmdir("$targetdir/mnt/hostrun");

    if ($use_zfs) {
	syscmd("zfs umount -a") == 0 ||
	    die "unable to unmount zfs\n";
    } else {
	syscmd("umount -d $targetdir");
    }

    if (!$err && $use_zfs) {
	syscmd("zfs set sync=standard $zfs_pool_name") == 0 ||
	    die "unable to set zfs properties\n";

	syscmd("zfs set mountpoint=/ $zfs_pool_name/ROOT/$zfs_root_volume_name") == 0 ||
	    die "zfs set mountpoint failed\n";

	syscmd("zpool set bootfs=$zfs_pool_name/ROOT/$zfs_root_volume_name $zfs_pool_name") == 0 ||
	    die "zpool set bootfs failed\n";
	syscmd("zpool export $zfs_pool_name");
    }

    if ($bootloader_err) {
	$err = $err && $err ne "\n" ? "$err\n$bootloader_err" : $bootloader_err;
    }

    die $err if $err;
}

my $last_display_change = 0;

my $display_info_counter = 0;

my $display_info_items = [
    "extract1-license.htm",
    "extract2-rulesystem.htm",
    "extract3-spam.htm",
    "extract4-virus.htm",
];

sub display_info {

    my $min_display_time = 15;

    my $ctime = time();

    return if ($ctime - $last_display_change) < $min_display_time;

    my $page = $display_info_items->[$display_info_counter % scalar(@$display_info_items)];

    $display_info_counter++;
    Proxmox::UI::display_html($page);
    $last_display_change = time();
}

sub prev_function {

    my ($text, $fctn) = @_;

    $fctn = $step_number if !$fctn;
    $text = "_Previous" if !$text;
    $gtk_state->{prev_btn}->set_label($text);

    $step_number--;
    $steps[$step_number]->{function}();

    $gtk_state->{prev_btn}->grab_focus();
}

sub set_next {
    my ($text, $fctn) = @_;

    $gtk_state->{next_btn_callback} = $fctn;
    my $step = $steps[$step_number];
    $text //= $steps[$step_number]->{next_button} // '_Next';
    $gtk_state->{next_btn}->set_label($text);

    $gtk_state->{next_btn}->grab_focus();
}

sub create_main_window {

    my $window = Gtk3::Window->new();
    $window->set_default_size(1024, 768);
    $window->signal_connect(map => sub { $window->set_resizable(0); });
    $window->fullscreen() if !is_test_mode();
    $window->set_decorated(0) if !is_test_mode();
    $window->signal_connect(destroy => sub { Gtk3->main_quit(); });

    my $vbox = Gtk3::Box->new('vertical', 0);

    my $logofn = "$iso_env->{product}-banner.png";
    my $image = Gtk3::Image->new_from_file("${proxmox_libdir}/$logofn");

    my $provider = Gtk3::CssProvider->new();
    my $theming = "* {\nbackground: #171717;\n}";
    $provider->load_from_data ([map ord, split //, $theming]);
    my $context = $image->get_style_context();
    $context->add_provider($provider, 600);

    $vbox->pack_start($image, 0, 0, 0);

    my $hbox = Gtk3::Box->new('horizontal', 0);
    $vbox->pack_start($hbox, 1, 1, 0);

 #  my $f1 = Gtk3::Frame->new ('test');
 #  $f1->set_shadow_type ('none');
 #  $hbox->pack_start ($f1, 1, 1, 0);

    my $sep1 = Gtk3::Separator->new('horizontal');
    $vbox->pack_start($sep1, 0, 0, 0);

    my $cmdbox = Gtk3::Box->new('horizontal', 0);
    $vbox->pack_start($cmdbox, 0, 0, 10);

    my $next_btn = Gtk3::Button->new('_Next');
    $next_btn->signal_connect(clicked => sub { $last_display_change = 0; $gtk_state->{next_btn_callback}->(); });
    $cmdbox->pack_end($next_btn, 0, 0, 10);

    my $prev_btn = Gtk3::Button->new('_Previous');
    $prev_btn->signal_connect(clicked => sub { $last_display_change = 0; &prev_function (); });
    $cmdbox->pack_end($prev_btn, 0, 0, 10);


    my $abort = Gtk3::Button->new('_Abort');
    $abort->set_can_focus(0);
    $cmdbox->pack_start($abort, 0, 0, 10);
    $abort->signal_connect(clicked => sub { app_quit(-1); });

    my $vbox2 = Gtk3::Box->new('vertical', 0);
    $hbox->add($vbox2);

    my $html_view = Gtk3::WebKit2::WebView->new();
    $html_view->set_hexpand(1);
    my $scrolls = Gtk3::ScrolledWindow->new();
    $scrolls->add($html_view);

    my $hbox2 = Gtk3::Box->new('horizontal', 0);
    $hbox2->pack_start($scrolls, 1, 1, 0);

    $vbox2->pack_start($hbox2, 1, 1, 0);

    my $vbox3 = Gtk3::Box->new('vertical', 0);
    $vbox2->pack_start($vbox3, 0, 0, 0);

    my $sep2 = Gtk3::Separator->new('horizontal');
    $vbox3->pack_start($sep2, 0, 0, 0);

    my $inbox = Gtk3::Box->new('horizontal', 0);
    $vbox3->pack_start($inbox, 0, 0, 0);

    $window->add($vbox);

    $gtk_state->{window} = $window;
    $gtk_state->{html_view} = $html_view;
    $gtk_state->{inbox} = $inbox;
    $gtk_state->{prev_btn} = $prev_btn;
    $gtk_state->{next_btn} = $next_btn;
    $gtk_state->{progress_bar} = Gtk3::ProgressBar->new();
    $gtk_state->{progress_status} = Gtk3::Label->new('');

    Proxmox::UI::init_gtk($gtk_state, $iso_env);

    $window->show_all;
    $window->present();
}

sub cleanup_view {
    $gtk_state->{inbox}->foreach(sub {
	my $child = shift;
	$gtk_state->{inbox}->remove ($child);
    });
}

# fixme: newer GTK3 has special properties to handle numbers with Entry
# only allow floating point numbers with Gtk3::Entry

sub check_float {
    my ($entry, $event) = @_;

    return check_number($entry, $event, 1);
}

sub check_int {
    my ($entry, $event) = @_;

    return check_number($entry, $event, 0);
}

sub check_number {
    my ($entry, $event, $float) = @_;

    my $val = $event->get_keyval;

    if (($float && $val == ord '.') ||
	$val == Gtk3::Gdk::KEY_ISO_Left_Tab ||
	$val == Gtk3::Gdk::KEY_Shift_L ||
	$val == Gtk3::Gdk::KEY_Tab ||
	$val == Gtk3::Gdk::KEY_Left ||
	$val == Gtk3::Gdk::KEY_Right ||
	$val == Gtk3::Gdk::KEY_BackSpace ||
	$val == Gtk3::Gdk::KEY_Delete ||
	($val >= ord '0' && $val <= ord '9') ||
	($val >= Gtk3::Gdk::KEY_KP_0 &&
	 $val <= Gtk3::Gdk::KEY_KP_9)) {
	return undef;
    }

    return 1;
}

sub create_text_input {
    my ($default, $text) = @_;

    my $hbox = Gtk3::Box->new('horizontal', 0);

    my $label = Gtk3::Label->new($text);
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox->pack_start($label, 0, 0, 10);
    my $e1 = Gtk3::Entry->new();
    $e1->set_width_chars(35);
    $hbox->pack_start($e1, 0, 0, 0);
    $e1->set_text($default);

    return ($hbox, $e1);
}
sub create_cidr_inputs {
    my ($cidr) = @_;

    my ($default_ip, $default_mask) = split('/', $cidr);

    my $hbox = Gtk3::Box->new('horizontal', 0);

    my $label = Gtk3::Label->new('IP Address (CIDR)');
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox->pack_start($label, 0, 0, 10);

    my $ip_el = Gtk3::Entry->new();
    $ip_el->set_width_chars(28);
    $hbox->pack_start($ip_el, 0, 0, 0);
    $ip_el->set_text($default_ip);

    $label = Gtk3::Label->new('/');
    $label->set_size_request(10, -1);
    $hbox->pack_start($label, 0, 0, 2);

    my $cidr_el = Gtk3::Entry->new();
    $cidr_el->set_width_chars(3);
    $hbox->pack_start($cidr_el, 0, 0, 0);
    $cidr_el->set_text($default_mask);

    return ($hbox, $ip_el, $cidr_el);
}

my $ipconf_first_view = 1;

sub create_ipconf_view {

    cleanup_view();
    Proxmox::UI::display_html('ipconf.htm');

    my $vcontainer = Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start($vcontainer, 1, 0, 0);
    my $hcontainer =  Gtk3::Box->new('horizontal', 0);
    $vcontainer->pack_start($hcontainer, 0, 0, 10);
    my $vbox =  Gtk3::Box->new('vertical', 0);
    $hcontainer->add($vbox);

    my $cidr = Proxmox::Install::Config::get_cidr() // '192.168.100.2/24';

    my ($cidr_box, $ipconf_entry_addr, $ipconf_entry_mask) = create_cidr_inputs($cidr);

    my $device_cb = Gtk3::ComboBoxText->new();
    $device_cb->set_active(0);
    $device_cb->set_visible(1);

    my $get_device_desc = sub {
	my $iface = shift;
	return "$iface->{name} - $iface->{mac} ($iface->{driver})";
    };

    my $device_active_map = {};
    my $device_active_reverse_map = {};

    my $device_change_handler = sub {
	my $current = shift;

	my $new = $device_active_map->{$current->get_active()};
	my $selected = Proxmox::Install::Config::get_mngmt_nic_id();
	return if defined($selected) && $new eq $selected;

	Proxmox::Install::Config::set_mngmt_nic_id($new);
	my $iface = $ipconf->{ifaces}->{$new};
	Proxmox::Install::Config::set_mngmt_nic($iface->{name});
	$ipconf_entry_addr->set_text($iface->{inet}->{addr} || $iface->{inet6}->{addr})
	    if $iface->{inet}->{addr} || $iface->{inet6}->{addr};
	$ipconf_entry_mask->set_text($iface->{inet}->{prefix} || $iface->{inet6}->{prefix})
	    if $iface->{inet}->{prefix} || $iface->{inet6}->{prefix};
    };

    my $i = 0;
    foreach my $index (sort keys %{$ipconf->{ifaces}}) {
	$device_cb->append_text(&$get_device_desc($ipconf->{ifaces}->{$index}));
	$device_active_map->{$i} = $index;
	$device_active_reverse_map->{$ipconf->{ifaces}->{$index}->{name}} = $i;
	if ($ipconf_first_view && $index == $ipconf->{default}) {
	    $device_cb->set_active($i);
	    &$device_change_handler($device_cb);
	    $ipconf_first_view = 0;
	}
	$device_cb->signal_connect('changed' => $device_change_handler);
	$i++;
    }

    if (my $nic = Proxmox::Install::Config::get_mngmt_nic()) {
	$device_cb->set_active($device_active_reverse_map->{$nic} // 0);
    } else {
	$device_cb->set_active(0);
    }

    my $devicebox = Gtk3::Box->new('horizontal', 0);
    my $label = Gtk3::Label->new("Management Interface:");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $devicebox->pack_start($label, 0, 0, 10);
    $devicebox->pack_start($device_cb, 0, 0, 0);

    $vbox->pack_start($devicebox, 0, 0, 2);

    my $fqdn = Proxmox::Install::Config::get_fqdn();
    my $hn = $fqdn // "$iso_env->{product}." . ($ipconf->{domain} // "example.invalid");

    my ($hostbox, $hostentry) = create_text_input($hn, 'Hostname (FQDN):');
    $vbox->pack_start($hostbox, 0, 0, 2);

    $vbox->pack_start($cidr_box, 0, 0, 2);

    my $cfg_gateway = Proxmox::Install::Config::get_gateway();
    my $gateway = $cfg_gateway // $ipconf->{gateway} || '192.168.100.1';

    my ($gwbox, $ipconf_entry_gw) = create_text_input($gateway, 'Gateway:');
    $vbox->pack_start($gwbox, 0, 0, 2);

    my $cfg_dns = Proxmox::Install::Config::get_dns();
    my $dnsserver = $cfg_dns // $ipconf->{dnsserver} || $gateway;

    my ($dnsbox, $ipconf_entry_dns) = create_text_input($dnsserver, 'DNS Server:');

    $vbox->pack_start($dnsbox, 0, 0, 0);

    $gtk_state->{inbox}->show_all;
    set_next(undef, sub {
	# verify hostname
	my $text = $hostentry->get_text();
	$text =~ s/^\s+//;
	$text =~ s/\s+$//;

	my $namere = "([a-zA-Z0-9]([a-zA-Z0-9\-]*[a-zA-Z0-9])?)";

	# Debian does not support purely numeric hostnames
	if ($text && $text =~ /^[0-9]+(?:\.|$)/) {
	    Proxmox::UI::message("Purely numeric hostnames are not allowed.");
	    $hostentry->grab_focus();
	    return;
	}

	if ($text && $text =~ m/^(${namere}\.)*${namere}$/ && $text !~ m/.example.invalid$/ &&
	    $text =~ m/^([^\.]+)\.(\S+)$/) {
	    Proxmox::Install::Config::set_hostname($1);
	    Proxmox::Install::Config::set_domain($2);
	} else {
	    Proxmox::UI::message("Hostname does not look like a fully qualified domain name.");
	    $hostentry->grab_focus();
	    return;
	}

	# verify ip address
	$text = $ipconf_entry_addr->get_text();
	my ($ipaddress, $ipversion) = parse_ip_address($text);
	if (!defined($ipaddress)) {
	    Proxmox::UI::message("IP address is not valid.");
	    $ipconf_entry_addr->grab_focus();
	    return;
	}

	$text = $ipconf_entry_mask->get_text();
	my $netmask = parse_ip_mask($text, $ipversion);
	if (!defined($netmask)) {
	    Proxmox::UI::message("Netmask is not valid.");
	    $ipconf_entry_mask->grab_focus();
	    return;
	}
	Proxmox::Install::Config::set_cidr("$ipaddress/$netmask");

	$text = $ipconf_entry_gw->get_text();
	my ($gateway_ip, $gateway_ip_version) = parse_ip_address($text);
	if (!defined($gateway_ip) || $gateway_ip_version != $ipversion) {
	    my $msg = defined($gateway_ip)
	        ? "Gateway and host IP version must not differ (IPv$gateway_ip_version != IPv$ipversion)."
	        : "Gateway is not valid.";
	    Proxmox::UI::message($msg);
	    $ipconf_entry_gw->grab_focus();
	    return;
	}
	Proxmox::Install::Config::set_gateway($gateway_ip);

	$text = $ipconf_entry_dns->get_text();
	my ($dns_ip, $dns_ip_version) = parse_ip_address($text);
	if (!defined($dns_ip) || $dns_ip_version != $ipversion) {
	    my $msg = defined($gateway_ip)
	        ? "DNS and host IP version must not differ (IPv$gateway_ip_version != IPv$ipversion)."
	        : "DNS IP is not valid.";
	    Proxmox::UI::message($msg);
	    $ipconf_entry_dns->grab_focus();
	    return;
	}
	Proxmox::Install::Config::set_dns($dns_ip);

	#print STDERR "TEST $ipaddress/$netmask $gateway_ip $dns_ip\n";

	$step_number++;
	create_ack_view();
    });

    $hostentry->grab_focus();
}

sub create_ack_view {

    cleanup_view();

    my $vbox =  Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start($vbox, 1, 0, 0);

    my $reboot_checkbox = Gtk3::CheckButton->new('Automatically reboot after successful installation');
    $reboot_checkbox->set_active(1);
    $reboot_checkbox->signal_connect ("toggled" => sub {
	my $cb = shift;
	Proxmox::Install::Config::set_autoreboot(!!$cb->get_active());
    });
    $vbox->pack_start($reboot_checkbox, 0, 0, 2);

    my $ack_template = "${proxmox_libdir}/html/ack_template.htm";
    my $ack_html = "${proxmox_libdir}/html/$iso_env->{product}/$steps[$step_number]->{html}";
    my $html_data = file_read_all($ack_template);

    my $country = Proxmox::Install::Config::get_country();

    my %config_values = (
	__target_hd__ => join(' | ', @{$config_options->{target_hds}}),
	__target_fs__ => Proxmox::Install::Config::get_filesys(),
	__country__ => $iso_env->{locales}->{country}->{$country}->{name},
	__timezone__ => Proxmox::Install::Config::get_timezone(),
	__keymap__ => Proxmox::Install::Config::get_keymap(),
	__mailto__ => Proxmox::Install::Config::get_mailto(),
	__interface__ =>  Proxmox::Install::Config::get_mngmt_nic(),
	__hostname__ => Proxmox::Install::Config::get_hostname(),
	__cidr__ => Proxmox::Install::Config::get_cidr(),
	__gateway__ => Proxmox::Install::Config::get_gateway(),
	__dnsserver__ => Proxmox::Install::Config::get_dns(),
    );

    while (my ($k, $v) = each %config_values) {
	$html_data =~ s/$k/$v/g;
    }

    file_write_all($ack_html, $html_data);

    Proxmox::UI::display_html('ack.htm');

    $gtk_state->{inbox}->show_all;

    set_next(undef, sub {
	$step_number++;
	create_extract_view();
    });
}

sub get_device_desc {
    my ($devname, $size, $model) = @_;

    if ($size && ($size > 0)) {
	$size = int($size/2048); # size in MiB, from 512B "sectors"

	my $text = "$devname (";
	if ($size >= 1024) {
	    $size = $size/1024; # size in GiB
	    if ($size >= 1024) {
		$size = $size/1024; # size in TiB
		$text .= sprintf("%.2f", $size) . "TiB";
	    } else {
		$text .= sprintf("%.2f", $size) . "GiB";
	    }
	} else {
	    $text .= "${size}MiB";
	}

	$text .= ", $model" if $model;
	$text .= ")";
	return $text;

    } else {
	return $devname;
    }
}

my $last_layout;
my $country_layout;
sub update_layout {
    my ($cb, $kmap) = @_;

    my $ind;
    my $def;
    my $i = 0;
    my $kmaphash = $iso_env->{locales}->{kmaphash};
    foreach my $layout (sort keys %$kmaphash) {
	$def = $i if $kmaphash->{$layout} eq 'en-us';
	$ind = $i if $kmap && $kmaphash->{$layout} eq $kmap;
	$i++;
    }

    my $val = $ind || $def || 0;

    if (!defined($kmap)) {
	$last_layout //= $val;
    } elsif (!defined($country_layout) || $country_layout != $val) {
	$last_layout = $country_layout = $val;
    }
    $cb->set_active($last_layout);
}

my $lastzonecb;
sub update_zonelist {
    my ($box, $cc) = @_;

    my $sel = Proxmox::Install::Config::get_timezone(); # initial default
    if ($lastzonecb) {
	$sel = $lastzonecb->get_active_text();
	$box->remove($lastzonecb);
    }

    my $cb = $lastzonecb = Gtk3::ComboBoxText->new();
    $cb->set_size_request(200, -1);
    $cb->signal_connect('changed' => sub {
	my $timezone = $cb->get_active_text();
	Proxmox::Install::Config::set_timezone($timezone);
    });

    my ($cczones, $zones) = $iso_env->{locales}->@{'cczones', 'zones'};
    my @available_zones = $cc && defined($cczones->{$cc}) ? keys %{$cczones->{$cc}} : keys %$zones;

    my ($i, $selected_index) = (0, undef);
    for my $zone (sort @available_zones) {
	$selected_index = $i if $sel && $zone eq $sel;
	$cb->append_text($zone);
	$i++;
    }

    # Append UTC here, so it is always the last item and never the default for any country.
    $cb->append_text('UTC');

    $cb->set_active($selected_index || 0);

    $cb->show;
    $box->pack_start($cb, 0, 0, 0);
}

sub create_password_view {

    cleanup_view();

    my $password = Proxmox::Install::Config::get_password();

    my $vbox2 =  Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start($vbox2, 1, 0, 0);
    my $vbox =  Gtk3::Box->new('vertical', 0);
    $vbox2->pack_start($vbox, 0, 0, 10);

    my $hbox1 = Gtk3::Box->new('horizontal', 0);
    my $label = Gtk3::Label->new("Password");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox1->pack_start($label, 0, 0, 10);
    my $pwe1 = Gtk3::Entry->new();
    $pwe1->set_visibility(0);
    $pwe1->set_text($password) if $password;
    $pwe1->set_size_request(200, -1);
    $hbox1->pack_start($pwe1, 0, 0, 0);

    my $hbox2 = Gtk3::Box->new('horizontal', 0);
    $label = Gtk3::Label->new("Confirm");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox2->pack_start($label, 0, 0, 10);
    my $pwe2 = Gtk3::Entry->new();
    $pwe2->set_visibility(0);
    $pwe2->set_text($password) if $password;
    $pwe2->set_size_request(200, -1);
    $hbox2->pack_start($pwe2, 0, 0, 0);

    my $hbox3 = Gtk3::Box->new('horizontal', 0);
    $label = Gtk3::Label->new("Email");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox3->pack_start($label, 0, 0, 10);
    my $eme = Gtk3::Entry->new();
    $eme->set_size_request(200, -1);
    $eme->set_text(Proxmox::Install::Config::get_mailto());
    $hbox3->pack_start($eme, 0, 0, 0);


    $vbox->pack_start($hbox1, 0, 0, 5);
    $vbox->pack_start($hbox2, 0, 0, 5);
    $vbox->pack_start($hbox3, 0, 0, 15);

    $gtk_state->{inbox}->show_all;

    Proxmox::UI::display_html('passwd.htm');

    set_next (undef,  sub {

	my $t1 = $pwe1->get_text;
	my $t2 = $pwe2->get_text;

	if (length ($t1) < 5) {
	    Proxmox::UI::message("Password is too short.");
	    $pwe1->grab_focus();
	    return;
	}

	if ($t1 ne $t2) {
	    Proxmox::UI::message("Password does not match.");
	    $pwe1->grab_focus();
	    return;
	}

	my $t3 = $eme->get_text;
	if ($t3 !~ m/^[\w\+\-\~]+(\.[\w\+\-\~]+)*@[a-zA-Z0-9\-]+(\.[a-zA-Z0-9\-]+)*$/) {
	    Proxmox::UI::message("Email does not look like a valid address (user\@domain.tld)");
	    $eme->grab_focus();
	    return;
	}

	if ($t3 eq 'mail@example.invalid') {
	    Proxmox::UI::message("Please enter a valid Email address");
	    $eme->grab_focus();
	    return;
	}

	Proxmox::Install::Config::set_password($t1);
	Proxmox::Install::Config::set_mailto($t3);

	$step_number++;
	create_ipconf_view();
    });

    $pwe1->grab_focus();

}

my $installer_kmap;
sub create_country_view {

    cleanup_view();

    my $locales = $iso_env->{locales};

    my $vbox2 =  Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start($vbox2, 1, 0, 0);
    my $vbox =  Gtk3::Box->new('vertical', 0);
    $vbox2->pack_start($vbox, 0, 0, 10);

    my $w = Gtk3::Entry->new();
    $w->set_size_request(200, -1);

    my $c = Gtk3::EntryCompletion->new();
    $c->set_text_column(0);
    $c->set_minimum_key_length(0);
    $c->set_popup_set_width(1);
    $c->set_inline_completion(1);

    my $hbox2 = Gtk3::Box->new('horizontal', 0);
    my $label = Gtk3::Label->new("Time zone");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox2->pack_start($label, 0, 0, 10);
    update_zonelist ($hbox2);

    my $hbox3 = Gtk3::Box->new('horizontal', 0);
    $label = Gtk3::Label->new("Keyboard Layout");
    $label->set_size_request(150, -1);
    $label->set_xalign(1.0);
    $hbox3->pack_start($label, 0, 0, 10);

    my $kmapcb = Gtk3::ComboBoxText->new();
    $kmapcb->set_size_request (200, -1);
    for my $layout (sort keys %{$locales->{kmaphash}}) {
	$kmapcb->append_text($layout);
    }

    update_layout($kmapcb);
    $hbox3->pack_start ($kmapcb, 0, 0, 0);

    $kmapcb->signal_connect ('changed' => sub {
	my $sel = $kmapcb->get_active_text();
	$last_layout = $kmapcb->get_active();
	if (my $kmap = $locales->{kmaphash}->{$sel}) {
	    my $xkmap = $locales->{kmap}->{$kmap}->{x11};
	    my $xvar = $locales->{kmap}->{$kmap}->{x11var};

	    Proxmox::Install::Config::set_keymap($kmap);

	    return if (defined($installer_kmap) && $installer_kmap eq $kmap);
	    $installer_kmap = $kmap;

	    if (!is_test_mode()) {
		syscmd ("setxkbmap $xkmap $xvar");

		my $kbd_config = qq{
		    XKBLAYOUT="$xkmap"
		    XKBVARIANT="$xvar"
		    BACKSPACE="guess"
		};
		$kbd_config =~ s/^\s+//gm;

		Proxmox::Sys::Command::run_in_background(sub {
		    file_write_all('/etc/default/keyboard', $kbd_config);
		    system("setupcon");
		});
	    }
	}
    });

    $w->signal_connect ('changed' => sub {
	my ($entry, $event) = @_;
	my $text = $entry->get_text;

	if (my $cc = $locales->{countryhash}->{lc($text)}) {
	    update_zonelist($hbox2, $cc);
	    my $kmap = $locales->{country}->{$cc}->{kmap} || 'en-us';
	    update_layout($kmapcb, $kmap);
	}
    });

    $w->signal_connect (key_press_event => sub {
	my ($entry, $event) = @_;
	my $text = $entry->get_text;

	my $val = $event->get_keyval;

	if ($val == Gtk3::Gdk::KEY_Tab) {
	    my $cc = $locales->{countryhash}->{lc($text)};

	    my $found = 0;
	    my $compl;

	    if ($cc) {
		$found = 1;
		$compl = $locales->{country}->{$cc}->{name};
	    } else {
		for my $country (values $locales->{country}->%*) {
		    if ($country->{name} =~ m/^\Q$text\E.*$/i) {
			$found++;
			$compl = $country->{name};
		    }
		    last if $found > 1;
		}
	    }

	    if ($found == 1) {
		$entry->set_text($compl);
		$c->complete();
		return undef;
	    } else {
		# beep ?
	    }

	    $c->complete();

	    my $buf = $w->get_buffer();
	    $buf->insert_text(-1, '', -1); # popup selection

	    return 1;
	}

	return undef;
    });

    my $country_store = Gtk3::ListStore->new('Glib::String');
    my $countries = $locales->{country};
    for my $cc (sort { $countries->{$a}->{name} cmp $countries->{$b}->{name} } keys %$countries) {
	my $iter = $country_store->append();
	$country_store->set($iter, 0, $countries->{$cc}->{name});
    }
    $c->set_model($country_store);

    $w->set_completion ($c);

    my $hbox =  Gtk3::Box->new('horizontal', 0);

    $label = Gtk3::Label->new("Country");
    $label->set_xalign(1.0);
    $label->set_size_request(150, -1);
    $hbox->pack_start($label, 0, 0, 10);
    $hbox->pack_start($w, 0, 0, 0);

    $vbox->pack_start($hbox, 0, 0, 5);
    $vbox->pack_start($hbox2, 0, 0, 5);
    $vbox->pack_start($hbox3, 0, 0, 5);

    my $country = Proxmox::Install::Config::get_country();
    if ($country && (my $entry = $locales->{country}->{$country})) {
	$w->set_text($entry->{name});
    }

    $gtk_state->{inbox}->show_all;

    Proxmox::UI::display_html('country.htm');
    set_next (undef,  sub {

	my $text = $w->get_text;

	if (my $cc = $locales->{countryhash}->{lc($text)}) {
	    Proxmox::Install::Config::set_country($cc);
	    $step_number++;
	    create_password_view();
	    return;
	} else {
	    Proxmox::UI::message("Please select a country first.");
	    $w->grab_focus();
	}
    });

    $w->grab_focus();
}

my $target_hd_combo;
my $target_hd_label;

my $hdoption_first_setup = 1;

my $create_basic_grid = sub {
    my $grid =  Gtk3::Grid->new();
    $grid->set_visible(1);
    $grid->set_column_spacing(10);
    $grid->set_row_spacing(10);
    $grid->set_hexpand(1);

    $grid->set_margin_start(10);
    $grid->set_margin_end(20);
    $grid->set_margin_top(5);
    $grid->set_margin_bottom(5);

    return $grid;
};

my $create_label_widget_grid = sub {
    my ($labeled_widgets) = @_;

    my $grid = &$create_basic_grid();
    my $row = 0;

    for (my $i = 0; $i < @$labeled_widgets; $i += 2) {
	my $widget = @$labeled_widgets[$i+1];
	my $label = Gtk3::Label->new(@$labeled_widgets[$i]);
	$label->set_visible(1);
	$label->set_xalign(1.0);
	$grid->attach($label, 0, $row, 1, 1);
	$widget->set_visible(1);
	$grid->attach($widget, 1, $row, 1, 1);
	$row++;
    }

    return $grid;
};

# only relevant for raid with its multipl diskX to diskY mappings.
my $get_selected_hdsize = sub {
    my $hdsize = shift;
    return $hdsize if defined($hdsize);

    # compute the smallest disk size of the actually selected disks
    my $cached_disks = get_cached_disks();
    my $disk_count = scalar(@$cached_disks);
    for (my $i = 0; $i < $disk_count; $i++) {
	my $cur_hd = $config_options->{"disksel$i"} // next;
	my $disksize = int(@$cur_hd[2] / (2 * 1024 * 1024.0)); # size in GB
	$hdsize //= $disksize;
	$hdsize = $disksize if $disksize < $hdsize;
    }

    if (my $cfg_hdsize = Proxmox::Install::Config::get_hdsize()) {
	# had the dialog open previously and set an even lower size than the disk selection allows
	$hdsize = $cfg_hdsize if $cfg_hdsize < $hdsize;
    }
    return $hdsize // 0; # fall back to zero, e.g., if none is selected hdsize cannot be any size
};

my sub update_hdsize_adjustment {
    my ($adjustment, $hdsize) = @_;

    $hdsize = $get_selected_hdsize->($hdsize);
    # expect that lower = 0 and step increments = 1 still are valid
    $adjustment->set_upper($hdsize + 1);
    $adjustment->set_value($hdsize);
}

my sub create_hdsize_adjustment {
    my ($hdsize) = @_;
    $hdsize = $get_selected_hdsize->($hdsize);
    my $cfg_hdsize = Proxmox::Install::Config::get_hdsize();
    # params are: initial value, lower, upper, step increment, page increment, page size
    return Gtk3::Adjustment->new($cfg_hdsize || $hdsize, 0, $hdsize+1, 1, 1, 1);
}

my sub get_hdsize_spin_button {
    my $hdsize = shift;

    my $hdsize_entry_buffer = Gtk3::EntryBuffer->new(undef, 1);
    my $hdsize_size_adj = create_hdsize_adjustment($hdsize);

    my $spinbutton_hdsize = Gtk3::SpinButton->new($hdsize_size_adj, 1, 1);
    $spinbutton_hdsize->set_buffer($hdsize_entry_buffer);
    $spinbutton_hdsize->set_adjustment($hdsize_size_adj);
    $spinbutton_hdsize->set_tooltip_text("only use specified size (GB) of the harddisk (rest left unpartitioned)");
    return $spinbutton_hdsize;
};

my $create_raid_disk_grid = sub {
    my ($hdsize_buttons) = @_;

    my $cached_disks = get_cached_disks();
    my $disk_count = scalar(@$cached_disks);
    my $disk_labeled_widgets = [];
    for (my $i = 0; $i < $disk_count; $i++) {
	my $disk_selector = Gtk3::ComboBoxText->new();
	$disk_selector->append_text("-- do not use --");
	$disk_selector->set_active(0);
	$disk_selector->set_visible(1);

	for my $hd (@$cached_disks) {
	    my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	    $disk_selector->append_text(get_device_desc($devname, $size, $model));
	}

	$disk_selector->{pve_disk_id} = $i;
	$disk_selector->signal_connect(changed => sub {
	    my $w = shift;
	    my $diskid = $w->{pve_disk_id};
	    my $a = $w->get_active - 1;
	    $config_options->{"disksel${diskid}"} = ($a >= 0) ? $cached_disks->[$a] : undef;
	    for my $btn (@$hdsize_buttons) {
		update_hdsize_adjustment($btn->get_adjustment());
	    }
	});

	if ($hdoption_first_setup) {
	    $disk_selector->set_active ($i+1) if $cached_disks->[$i];
	} else {
	    my $hdind = 0;
	    if (my $cur_hd = $config_options->{"disksel$i"}) {
		foreach my $hd (@$cached_disks) {
		    if (@$hd[1] eq @$cur_hd[1]) {
			$disk_selector->set_active($hdind+1);
			last;
		    }
		    $hdind++;
		}
	    }
	}

	push @$disk_labeled_widgets, "Harddisk $i", $disk_selector;
    }

    my $clear_all_button = Gtk3::Button->new('_Deselect All');
    if ($disk_count > 3) {
	$clear_all_button->signal_connect('clicked', sub {
	    my $is_widget = 0;
	    for my $disk_selector (@$disk_labeled_widgets) {
		$disk_selector->set_active(0) if $is_widget;
		$is_widget ^= 1;
	    }
	});
	$clear_all_button->set_visible(1);
    }

    my $scrolled_window = Gtk3::ScrolledWindow->new();
    $scrolled_window->set_hexpand(1);
    $scrolled_window->set_propagate_natural_height(1) if $disk_count > 4;

    my $diskgrid = $create_label_widget_grid->($disk_labeled_widgets);

    $scrolled_window->add($diskgrid);
    $scrolled_window->set_policy('never', 'automatic');
    $scrolled_window->set_visible(1);
    $scrolled_window->set_min_content_height(190);

    my $vbox = Gtk3::Box->new('vertical', 0);
    $vbox->pack_start($scrolled_window, 1, 1, 10);

    my $hbox = Gtk3::Box->new('horizontal', 0);
    $hbox->pack_end($clear_all_button, 0, 0, 20);
    $hbox->set_visible(1);
    $vbox->pack_end($hbox, 0, 0, 0);

    return $vbox;
};

my $create_raid_advanced_grid = sub {
    my ($hdsize_btn) = @_;
    my $labeled_widgets = [];
    my $spinbutton_ashift = Gtk3::SpinButton->new_with_range(9, 13, 1);
    $spinbutton_ashift->set_tooltip_text("zpool ashift property (pool sector size, default 2^12)");
    $spinbutton_ashift->signal_connect ("value-changed" => sub {
	my $w = shift;
	$config_options->{ashift} = $w->get_value_as_int();
    });
    $config_options->{ashift} = 12 if ! defined($config_options->{ashift});
    $spinbutton_ashift->set_value($config_options->{ashift});
    push @$labeled_widgets, "ashift";
    push @$labeled_widgets, $spinbutton_ashift;

    my $combo_compress = Gtk3::ComboBoxText->new();
    $combo_compress->set_tooltip_text("zfs compression algorithm for rpool dataset");
    my $comp_opts = ["on","off","lzjb","lz4", "zle", "gzip", "zstd"];
    foreach my $opt (@$comp_opts) {
	$combo_compress->append($opt, $opt);
    }
    $config_options->{compress} = "on" if !defined($config_options->{compress});
    $combo_compress->set_active_id($config_options->{compress});
    $combo_compress->signal_connect (changed => sub {
	my $w = shift;
	$config_options->{compress} = $w->get_active_text();
    });
    push @$labeled_widgets, "compress";
    push @$labeled_widgets, $combo_compress;

    my $combo_checksum = Gtk3::ComboBoxText->new();
    $combo_checksum->set_tooltip_text("zfs checksum algorithm for rpool dataset");
    my $csum_opts = ["on", "off","fletcher2", "fletcher4", "sha256"];
    foreach my $opt (@$csum_opts) {
	$combo_checksum->append($opt, $opt);
    }
    $config_options->{checksum} = "on" if !($config_options->{checksum});
    $combo_checksum->set_active_id($config_options->{checksum});
    $combo_checksum->signal_connect (changed => sub {
	my $w = shift;
	$config_options->{checksum} = $w->get_active_text();
    });
    push @$labeled_widgets, "checksum";
    push @$labeled_widgets, $combo_checksum;

    my $spinbutton_copies = Gtk3::SpinButton->new_with_range(1,3,1);
    $spinbutton_copies->set_tooltip_text("zfs copies property for rpool dataset (in addition to RAID redundancy!)");
    $spinbutton_copies->signal_connect ("value-changed" => sub {
	my $w = shift;
	$config_options->{copies} = $w->get_value_as_int();
    });
    $config_options->{copies} = 1 if !defined($config_options->{copies});
    $spinbutton_copies->set_value($config_options->{copies});
    push @$labeled_widgets, "copies", $spinbutton_copies;

    push @$labeled_widgets, "hdsize", $hdsize_btn;
    return $create_label_widget_grid->($labeled_widgets);;
};

my $create_btrfs_raid_advanced_grid = sub {
    my ($hdsize_btn) = @_;
    my $labeled_widgets = [];
    push @$labeled_widgets, "hdsize", $hdsize_btn;
    return $create_label_widget_grid->($labeled_widgets);;
};

sub create_hdoption_view {
    my $dialog = Gtk3::Dialog->new();

    $dialog->set_title("Harddisk options");

    $dialog->add_button("_OK", 1);

    my $contarea = $dialog->get_content_area();

    my $hbox2 =  Gtk3::Box->new('horizontal', 0);
    $contarea->pack_start($hbox2, 1, 1, 5);

    my $grid =  Gtk3::Grid->new();
    $grid->set_column_spacing(10);
    $grid->set_row_spacing(10);

    $hbox2->pack_start($grid, 1, 0, 5);

    my $row = 0;

    # Filesystem type
    my $label0 = Gtk3::Label->new("Filesystem");
    $label0->set_xalign(1.0);
    $grid->attach($label0, 0, $row, 1, 1);

    my $fstypecb = Gtk3::ComboBoxText->new();
    my $fstype = [
	'ext4',
	'xfs',
	'zfs (RAID0)',
	'zfs (RAID1)',
	'zfs (RAID10)',
	'zfs (RAIDZ-1)',
	'zfs (RAIDZ-2)',
	'zfs (RAIDZ-3)',
    ];
    push @$fstype, 'btrfs (RAID0)', 'btrfs (RAID1)', 'btrfs (RAID10)'
	if $iso_env->{cfg}->{enable_btrfs};

    my $filesys = Proxmox::Install::Config::get_filesys();
    my $tcount = 0;
    foreach my $tmp (@$fstype) {
	$fstypecb->append_text($tmp);
	$fstypecb->set_active ($tcount) if $filesys eq $tmp;
	$tcount++;
    }

    $grid->attach($fstypecb, 1, $row, 1, 1);

    $hbox2->show_all();

    $row++;

    my $sep = Gtk3::Separator->new('horizontal');
    $sep->set_visible(1);
    $grid->attach($sep, 0, $row, 2, 1);
    $row++;

    my $hw_raid_note = Gtk3::Label->new(""); # text will be set below, before making it visible
    $hw_raid_note->set_line_wrap(1);
    $hw_raid_note->set_max_width_chars(30);
    $hw_raid_note->set_visible(0);
    $grid->attach($hw_raid_note, 0, $row++, 2, 1);

    my $hdsize_labeled_widgets = [];

    # size compute
    my $hdsize = 0;
    if ( -b $target_hd) {
	$hdsize = int(Proxmox::Sys::Block::hd_size($target_hd) / (1024 * 1024.0)); # size in GB
    } elsif ($target_hd) {
	$hdsize = int((-s $target_hd) / (1024 * 1024 * 1024.0));
    }

    my $spinbutton_hdsize_nonraid = get_hdsize_spin_button($hdsize);
    push @$hdsize_labeled_widgets, "hdsize", $spinbutton_hdsize_nonraid;
    my $spinbutton_hdsize = $spinbutton_hdsize_nonraid;

    my $entry_swapsize = Gtk3::Entry->new();
    $entry_swapsize->set_tooltip_text("maximum SWAP size (GB)");
    $entry_swapsize->signal_connect (key_press_event => \&check_float);
    my $swapsize = Proxmox::Install::Config::get_swapsize();
    $entry_swapsize->set_text($swapsize) if defined($swapsize);
    push @$hdsize_labeled_widgets, "swapsize", $entry_swapsize;

    my $entry_maxroot = Gtk3::Entry->new();
    if ($iso_env->{product} eq 'pve') {
	$entry_maxroot->set_tooltip_text("maximum size (GB) for LVM root volume");
	$entry_maxroot->signal_connect (key_press_event => \&check_float);
	if (my $maxroot = Proxmox::Install::Config::get_maxroot()) {
	    $entry_maxroot->set_text($maxroot);
	}
	push @$hdsize_labeled_widgets, "maxroot", $entry_maxroot;
    }

    my $entry_minfree = Gtk3::Entry->new();
    $entry_minfree->set_tooltip_text("minimum free LVM space (GB, required for LVM snapshots)");
    $entry_minfree->signal_connect (key_press_event => \&check_float);
    if (defined(my $minfree = Proxmox::Install::Config::get_minfree())) {
	$entry_minfree->set_text($minfree);
    }
    push @$hdsize_labeled_widgets, "minfree", $entry_minfree;

    my $entry_maxvz;
    if ($iso_env->{product} eq 'pve') {
	$entry_maxvz = Gtk3::Entry->new();
	$entry_maxvz->set_tooltip_text("maximum size (GB) for LVM data volume");
	$entry_maxvz->signal_connect (key_press_event => \&check_float);
	if (defined(my $maxvz = Proxmox::Install::Config::get_maxvz())) {
	    $entry_maxvz->set_text($maxvz);
	}
	push @$hdsize_labeled_widgets, "maxvz", $entry_maxvz;
    }

    my $spinbutton_hdsize_zfs = get_hdsize_spin_button($hdsize);
    my $spinbutton_hdsize_btrfs = get_hdsize_spin_button($hdsize);
    my $hdsize_buttons = [ $spinbutton_hdsize_zfs, $spinbutton_hdsize_btrfs ];
    my $options_stack = Gtk3::Stack->new();
    $options_stack->set_visible(1);
    $options_stack->set_hexpand(1);
    $options_stack->set_vexpand(1);
    $options_stack->add_titled(&$create_raid_disk_grid($hdsize_buttons), "raiddisk", "Disk Setup");
    $options_stack->add_titled(&$create_label_widget_grid($hdsize_labeled_widgets), "hdsize", "Size Options");
    $options_stack->add_titled(&$create_raid_advanced_grid($spinbutton_hdsize_zfs), "raidzfsadvanced", "Advanced Options");
    $options_stack->add_titled(&$create_btrfs_raid_advanced_grid($spinbutton_hdsize_btrfs), "raidbtrfsadvanced", "Advanced Options");
    $options_stack->set_visible_child_name("raiddisk");
    my $options_stack_switcher = Gtk3::StackSwitcher->new();
    $options_stack_switcher->set_halign('center');
    $options_stack_switcher->set_stack($options_stack);
    $grid->attach($options_stack_switcher, 0, $row, 2, 1);
    $row++;
    $grid->attach($options_stack, 0, $row, 2, 1);
    $row++;

    $hdoption_first_setup = 0;

    my $switch_view = sub {
	my $filesys = Proxmox::Install::Config::get_filesys();
	my $raid = $filesys =~ m/zfs|btrfs/;
	my $is_zfs = $filesys =~ m/zfs/;

	$target_hd_combo->set_visible(!$raid);
	$options_stack->get_child_by_name("hdsize")->set_visible(!$raid);
	$options_stack->get_child_by_name("raiddisk")->set_visible($raid);

	if ($raid) {
	    my $msg = "<b>Note</b>: " . ($is_zfs
		? "ZFS is not compatible with hardware RAID controllers, for details see the documentation."
		: "BTRFS integration in $iso_env->{cfg}->{fullname} is a technology preview!"
	    );
	    $hw_raid_note->set_markup($msg);
	}
	$hw_raid_note->set_visible($raid);
	$options_stack_switcher->set_visible($raid);
	$options_stack->get_child_by_name("raidzfsadvanced")->set_visible($is_zfs);
	$options_stack->get_child_by_name("raidbtrfsadvanced")->set_visible(!$is_zfs);
	if ($raid) {
	    $target_hd_label->set_text("Target: $filesys ");
	    $options_stack->set_visible_child_name("raiddisk");
	} else {
	    $target_hd_label->set_text("Target Harddisk: ");
	}

	if ($raid) {
	    $spinbutton_hdsize = $is_zfs ? $spinbutton_hdsize_zfs : $spinbutton_hdsize_btrfs;
	} else {
	    $spinbutton_hdsize = $spinbutton_hdsize_nonraid;
	}

	my (undef, $pref_width) = $dialog->get_preferred_width();
	my (undef, $pref_height) = $dialog->get_preferred_height();
	$pref_height = 750 if $pref_height > 750;
	$dialog->resize($pref_width, $pref_height);
    };

    &$switch_view();

    $fstypecb->signal_connect (changed => sub {
	my $new_filesys = $fstypecb->get_active_text();
	Proxmox::Install::Config::set_filesys($new_filesys);
	&$switch_view();
    });

    my $sep2 = Gtk3::Separator->new('horizontal');
    $sep2->set_visible(1);
    $contarea->pack_end($sep2, 1, 1, 10);

    $dialog->show();

    $dialog->run();

    my $get_float = sub {
	my ($entry) = @_;

	my $text = $entry->get_text();
	return undef if !defined($text);

	$text =~ s/^\s+//;
	$text =~ s/\s+$//;

	return undef if $text !~ m/^\d+(\.\d+)?$/;

	return $text;
    };

    my $tmp;

    if (($tmp = &$get_float($spinbutton_hdsize)) && ($tmp != $hdsize)) {
	Proxmox::Install::Config::set_hdsize($tmp);
    } else {
	Proxmox::Install::Config::set_hdsize(undef);
    }

    if (defined($tmp = &$get_float($entry_swapsize))) {
	Proxmox::Install::Config::set_swapsize($tmp);
    } else {
	Proxmox::Install::Config::set_swapsize(undef);
    }

    if (defined($tmp = &$get_float($entry_maxroot))) {
	Proxmox::Install::Config::set_maxroot($tmp);
    } else {
	Proxmox::Install::Config::set_maxroot(undef);
    }

    if (defined($tmp = &$get_float($entry_minfree))) {
	Proxmox::Install::Config::set_minfree($tmp);
    } else {
	Proxmox::Install::Config::set_minfree(undef);
    }

    if ($entry_maxvz && defined($tmp = &$get_float($entry_maxvz))) {
	Proxmox::Install::Config::set_maxvz($tmp);
    } else {
	Proxmox::Install::Config::set_maxvz(undef);
    }

    $dialog->destroy();
}

my $get_raid_devlist = sub {

    my $dev_name_hash = {};

    my $cached_disks = get_cached_disks();
    my $devlist = [];
    for (my $i = 0; $i < @$cached_disks; $i++) {
	if (my $hd = $config_options->{"disksel$i"}) {
	    my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	    die "device '$devname' is used more than once\n"
		if $dev_name_hash->{$devname};
	    $dev_name_hash->{$devname} = $hd;
	    push @$devlist, $hd;
	}
    }

    return $devlist;
};

sub zfs_mirror_size_check {
    my ($expected, $actual) = @_;

    die "mirrored disks must have same size\n"
	if abs($expected - $actual) > $expected / 10;
}

sub legacy_bios_4k_check {
    my ($lbs) = @_;
    die "Booting from 4kn drive in legacy BIOS mode is not supported.\n"
	if $run_env->{boot_type} ne 'efi' && $lbs == 4096;
}

sub get_zfs_raid_setup {
    my $filesys = Proxmox::Install::Config::get_filesys();

    my $devlist = &$get_raid_devlist();

    my $diskcount = scalar(@$devlist);
    die "$filesys needs at least one device\n" if $diskcount < 1;

    my $cmd= '';
    if ($filesys eq 'zfs (RAID0)') {
	foreach my $hd (@$devlist) {
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	}
    } elsif ($filesys eq 'zfs (RAID1)') {
	die "zfs (RAID1) needs at least 2 device\n" if $diskcount < 2;
	$cmd .= ' mirror ';
	my $hd = @$devlist[0];
	my $expected_size = @$hd[2]; # all disks need approximately same size
	foreach my $hd (@$devlist) {
	    zfs_mirror_size_check($expected_size, @$hd[2]);
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	}
    } elsif ($filesys eq 'zfs (RAID10)') {
	die "zfs (RAID10) needs at least 4 device\n" if $diskcount < 4;
	die "zfs (RAID10) needs an even number of devices\n" if $diskcount & 1;

	for (my $i = 0; $i < $diskcount; $i+=2) {
	    my $hd1 = @$devlist[$i];
	    my $hd2 = @$devlist[$i+1];
	    zfs_mirror_size_check(@$hd1[2], @$hd2[2]); # pairs need approximately same size
	    legacy_bios_4k_check(@$hd1[4]);
	    legacy_bios_4k_check(@$hd2[4]);
	    $cmd .= ' mirror ' . @$hd1[1] . ' ' . @$hd2[1];
	}

    } elsif ($filesys =~ m/^zfs \(RAIDZ-([123])\)$/) {
	my $level = $1;
	my $mindisks = 2 + $level;
	die "zfs (RAIDZ-$level) needs at least $mindisks devices\n" if scalar(@$devlist) < $mindisks;
	my $hd = @$devlist[0];
	my $expected_size = @$hd[2]; # all disks need approximately same size
	$cmd .= " raidz$level";
	foreach my $hd (@$devlist) {
	    zfs_mirror_size_check($expected_size, @$hd[2]);
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	}
    } else {
	die "unknown zfs mode '$filesys'\n";
    }

    return ($devlist, $cmd);
}

sub get_btrfs_raid_setup {
    my $filesys = Proxmox::Install::Config::get_filesys();

    my $devlist = &$get_raid_devlist();

    my $diskcount = scalar(@$devlist);
    die "$filesys needs at least one device\n" if $diskcount < 1;

    my $mode;

    if ($diskcount == 1) {
	$mode = 'single';
    } else {
	if ($filesys eq 'btrfs (RAID0)') {
	    $mode = 'raid0';
	} elsif ($filesys eq 'btrfs (RAID1)') {
	    die "btrfs (RAID1) needs at least 2 device\n" if $diskcount < 2;
	    $mode = 'raid1';
	} elsif ($filesys eq 'btrfs (RAID10)') {
	    die "btrfs (RAID10) needs at least 4 device\n" if $diskcount < 4;
	    $mode = 'raid10';
	} else {
	    die "unknown btrfs mode '$filesys'\n";
	}
    }

    return ($devlist, $mode);
}

my $last_hd_selected = 0;
sub create_hdsel_view {

    $gtk_state->{prev_btn}->set_sensitive(1); # enable previous button at this point

    cleanup_view();

    my $vbox =  Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start($vbox, 1, 0, 0);
    my $hbox =  Gtk3::Box->new('horizontal', 0);
    $vbox->pack_start($hbox, 0, 0, 10);

    my $cached_disks = get_cached_disks();
    my ($disk, $devname, $size, $model, $logical_bsize) = $cached_disks->[0]->@*;
    $target_hd = $devname if !defined($target_hd);

    $target_hd_label = Gtk3::Label->new("Target Harddisk: ");
    $hbox->pack_start($target_hd_label, 0, 0, 0);

    $target_hd_combo = Gtk3::ComboBoxText->new();

    foreach my $hd ($cached_disks->@*) {
	($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	$target_hd_combo->append_text(get_device_desc($devname, $size, $model));
    }

    my $raid = Proxmox::Install::Config::get_filesys() =~ m/zfs|btrfs/;
    if ($raid) {
	my $filesys = Proxmox::Install::Config::get_filesys();
	$target_hd_label->set_text("Target: $filesys ");
	$target_hd_combo->set_visible(0);
	$target_hd_combo->set_no_show_all(1);
    }
    $target_hd_combo->set_active($last_hd_selected);
    $target_hd_combo->signal_connect(changed => sub {
	$a = shift->get_active;
	my ($disk, $devname) = @{@$cached_disks[$a]};
	$last_hd_selected = $a;
	$target_hd = $devname;
    });

    $hbox->pack_start($target_hd_combo, 0, 0, 10);

    my $options = Gtk3::Button->new('_Options');
    $options->signal_connect (clicked => \&create_hdoption_view);
    $hbox->pack_start ($options, 0, 0, 0);


    $gtk_state->{inbox}->show_all;

    Proxmox::UI::display_html('page1.htm');

    set_next(undef, sub {
	my $filesys = Proxmox::Install::Config::get_filesys();
	if ($filesys =~ m/zfs/) {
	    my ($devlist) = eval { get_zfs_raid_setup() };
	    if (my $err = $@) {
		Proxmox::UI::message("Warning: $err\nPlease fix ZFS setup first.");
		return;
	    }
	    $config_options->{target_hds} = [ map { $_->[1] } @$devlist ];
	} elsif ($filesys =~ m/btrfs/) {
	    my ($devlist) = eval { get_btrfs_raid_setup() };
	    if (my $err = $@) {
		Proxmox::UI::message("Warning: $err\nPlease fix BTRFS setup first.");
		return;
	    }
	    $config_options->{target_hds} = [ map { $_->[1] } @$devlist ];
	} else {
	    eval {
		my $target_block_size = Proxmox::Sys::Block::logical_blocksize($target_hd);
		legacy_bios_4k_check($target_block_size);
	    };
	    if (my $err = $@) {
		Proxmox::UI::message("Warning: $err\n");
		return;
	    }
	    $config_options->{target_hds} = [ $target_hd ];
	}

	$step_number++;
	create_country_view();
    });
}

sub create_extract_view {

    cleanup_view();

    Proxmox::Install::display_info();

    $gtk_state->{next_btn}->set_sensitive(0);
    $gtk_state->{prev_btn}->set_sensitive(0);
    $gtk_state->{prev_btn}->hide();

    my $vbox =  Gtk3::Box->new('vertical', 0);
    $gtk_state->{inbox}->pack_start ($vbox, 1, 0, 0);
    my $hbox =  Gtk3::Box->new('horizontal', 0);
    $vbox->pack_start ($hbox, 0, 0, 10);

    my $vbox2 =  Gtk3::Box->new('vertical', 0);
    $hbox->pack_start ($vbox2, 0, 0, 0);

    $vbox2->pack_start($gtk_state->{progress_status}, 1, 1, 0);

    $gtk_state->{progress_bar}->set_show_text(1);
    $gtk_state->{progress_bar}->set_size_request (600, -1);

    $vbox2->pack_start($gtk_state->{progress_bar}, 0, 0, 0);

    $gtk_state->{inbox}->show_all();

    my $tdir = is_test_mode() ? "target" : "/target";
    mkdir $tdir;
    my $base = "${proxmox_cddir}/$iso_env->{product}-base.squashfs";

    eval  { extract_data($base, $tdir); };
    my $err = $@;

    $gtk_state->{next_btn}->set_sensitive(1);

    set_next("_Reboot", sub { app_quit(0); } );

    my $autoreboot = Proxmox::Install::Config::get_autoreboot();
    my $success_transform = sub {
	my ($raw_html, $iso_env) = @_;

	my $ip_addr = Proxmox::Install::Config::get_ip_addr();
	my $ip_version = Proxmox::Install::Config::get_ip_version();

	my $addr = $ip_version == 6 ? "[${ip_addr}]" : "$ip_addr";
	$raw_html =~ s/__IPADDR__/$addr/g;
	$raw_html =~ s/__PORT__/$iso_env->{cfg}->{port}/g;

	my $autoreboot_msg = $autoreboot ? "Automatic reboot scheduled in $autoreboot_seconds seconds." : '';
	$raw_html =~ s/__AUTOREBOOT_MSG__/$autoreboot_msg/;

	return $raw_html;
    };

    if ($err) {
	Proxmox::UI::display_html("fail.htm");
	# suppress "empty" error as we got some case where the user choose to abort on a prompt,
	# there it doesn't make sense to show them an error again, they "caused" it after all.
	Proxmox::UI::error($err) if $err ne "\n";
    } else {
	cleanup_view();
	Proxmox::UI::display_html("success.htm", $success_transform);

        if ($autoreboot) {
	    Glib::Timeout->add(1000, sub {
		if ($autoreboot_seconds > 0) {
		    $autoreboot_seconds--;
		    Proxmox::UI::display_html("success.htm", $success_transform);
		} else {
		    app_quit(0);
		}
	    });
	}
    }
}

sub create_intro_view {

    $gtk_state->{prev_btn}->set_sensitive(0);

    cleanup_view();

    if (int($run_env->{total_memory}) < 1024) {
	Proxmox::UI::error("Less than 1 GiB of usable memory detected, installation will probably fail.\n\n".
	    "See 'System Requirements' in the $iso_env->{cfg}->{fullname} documentation.");
    }

    if ($iso_env->{product} eq 'pve') {
	my $cpuinfo = eval { file_read_all('/proc/cpuinfo') };
	if (!$cpuinfo || $cpuinfo !~ /^flags\s*:.*(vmx|svm)/m) {
	    Proxmox::UI::error(
		"No support for hardware-accelerated KVM virtualization detected.\n\n"
		."Check BIOS settings for Intel VT / AMD-V / SVM."
	    );
	}
    }

    Proxmox::UI::display_html('license.htm', sub {
	my ($raw_html, $iso_env) = @_;

	my $license = eval { decode('utf8', file_read_all("${proxmox_cddir}/EULA")) };
	if (my $err = $@) {
	    die $err if !is_test_mode();
	    $license = "TESTMODE: Ignore non existent EULA...\n";
	}
	my $title = "END USER LICENSE AGREEMENT (EULA)";
	$raw_html =~ s/__LICENSE__/$license/;
	$raw_html =~ s/__LICENSE_TITLE__/$title/;

	return $raw_html;
    });

    $step_number++;
    set_next("I a_gree", \&create_hdsel_view);
}

$ipconf = Proxmox::Sys::Net::get_ip_config();

Gtk3::init();

create_main_window ();

my $initial_error = 0;

{
    my $cached_disks = get_cached_disks();
    if (!defined($cached_disks) || (scalar (@$cached_disks) <= 0)) {
	print STDERR "no harddisks found\n";
	$initial_error = 1;
	Proxmox::UI::display_html("nohds.htm");
	set_next("Reboot", sub { app_quit(0); } );
    } else {
	foreach my $hd (@$cached_disks) {
	    my ($disk, $devname) = @$hd;
	    next if $devname =~ m|^/dev/md\d+$|;
	    print STDERR "found Disk$disk N:$devname\n";
	}
    }
}

if (!$initial_error && (scalar keys %{ $ipconf->{ifaces} } == 0)) {
    print STDERR "no network interfaces found\n";
    $initial_error = 1;
    Proxmox::UI::display_html("nonics.htm");
    set_next("Reboot", sub { app_quit(0); } );
}

create_intro_view () if !$initial_error;

Gtk3->main;

app_quit(0);