#!/usr/bin/perl -w

use strict;
use Getopt::Long;
use File::Path;
use File::Basename;

my $SETFILE = '/Developer/Tools/SetFile';

my $verbose = 1;
my $quiet = ($verbose ? '' : '-quiet');
my $rmtmp = 0;
my $over = 0;
my $mountpoint = '';
my $bgimg = '';
my $volicon = '';
my $volname = 'OpenNX';
my $tmpdmg = '';
my $iconsize = 48;
my $textsize = 12;
my $foptfile = '';
my %windowsize = (
    'w' => 400,
    'h' => 300,
);
my %windowpos = (
    'x' => 100,
    'y' => 50,
);
my %fopts;

sub chkrun($) {
    my $cmd = shift;
    system($cmd);
    if ($? == -1) {
        die "aCan't run $cmd: $!\n";
    } elsif ($? & 127) {
        die "child died with signal %d, %s coredump\n",
        ($? & 127),  ($? & 128) ? 'with' : 'without';
    }
    if (($? >> 8) != 0) {
        die "bCan't run $cmd: $!\n";
    }
}

sub usage($) {
    my $err = shift;
    print STDERR<<EOF
Usage: [OPTIONS] output.dmg <source folder>
  Available OPTIONS:
    -h|--help            Print this text
    -n|--name NAME       Use specified volume NAME
    -m|--mountpoint PATH Use specified PATH as temporary mountpoint
    -b|--bgimage FILE    Use specified FILE as background image.
    -o|--overwrite       Overwrite the dmg file.
    -i|--icon FILE       Use specified FILE as volume Icon.
    -f|--fileopts FILE   Read icon options from specified FILE.
EOF
;    exit($err);
}

sub runscript($) {
    my $script = shift;
    print "Running AppleScript:\n", $script, "\n" if ($verbose);
    open(P, "|osascript") || die "Can't run osascript: $!\n";
    print P $script;
    close P;
}

sub imgsize($) {
    my $imgfile = shift;
    my $w = -1;
    my $h = -1;
    if ($imgfile ne '') {
        open(P, "sips -g pixelHeight -g pixelWidth $imgfile 2>/dev/null |");
        while (<P>) {
	    chomp;
            if (/\s*pixelHeight:\s*(\d+)/) {
                $windowsize{'h'} = int($1);
            }
            if (/\s*pixelWidth:\s*(\d+)/) {
                $windowsize{'w'} = int($1);
            }
        }
        close P;
    }
}

sub readfopts() {
    if ($foptfile ne '') {
        open(F, "<$foptfile") || die "Can't read $foptfile: $!\n";
        while (<F>) {
            chomp;
            next if (/^\s*$/);
            next if (/^\s*\#/);
            if (/^(\d+)\s+(\d+)\s+([EVev\-]+)\s+(.*)$/) {
                $fopts{$4} = {'x' => $1, 'y' => $2, 'o' => $3};
            }
        }
        close F;
    }
}

sub window_bounds() {
    my $x2 = $windowpos{'x'} + $windowsize{'w'};
    my $y2 = $windowpos{'y'} + $windowsize{'h'};
    return $windowpos{'x'} . ", " .
        $windowpos{'y'} . ", " . $x2 . ", " .  $y2;
}

sub file_positions() {
    my $ret = '';
    foreach (keys %fopts) {
        $ret .= 'set position of item "' . $_ .
            '" to {' . ${$fopts{$_}}{'x'} . ', ' . ${$fopts{$_}}{'y'} . "}\n";
    }
    return $ret;
}

sub file_options() {
    my $ret = '';
    foreach (keys %fopts) {
        my $o = ${$fopts{$_}}{'o'};
        my $f = "$mountpoint/$_";
        next if ($o eq '-');
        next if (! -e $f);
        chkrun($SETFILE.' -a '.$o.' "'.$f.'"');
    }
    return $ret;
}

sub END() {
    system("sudo hdiutil detach $mountpoint $quiet -force >/dev/null 2>&1");
    rmtree($mountpoint) if $rmtmp;
    rmtree($tmpdmg) if ($tmpdmg ne '');
}

usage(1) unless GetOptions(
    "name=s"        => \$volname,
    "bgimg=s"       => \$bgimg,
    "icon=s"        => \$volicon,
    "fileoptions=s" => \$foptfile,
    "overwrite"     => \$over,
    "help"          => sub { usage(0); },
);
if ($#ARGV < 1) {
    print STDERR "Missing required argument\n";
    usage(1);
}
if ($#ARGV > 1) {
    print STDERR "Too many arguments\n";
    usage(1);
}
# This MUST be below /Volumes, because Finder expects it there
$mountpoint = '/Volumes/'.$volname;
my $out = shift;
my $src = shift;
$tmpdmg = "$out$$.dmg";
unlink($out) if ($over);
unlink($tmpdmg) if ($over);
die "Background image does not exist\n" unless (($bgimg eq '') || (-e $bgimg));
die "Volume icon does not exist\n" unless (($volicon eq '') || (-e $volicon));
die "Disk image $out already exists\n" if (-e $out);
die "Source folder $src does not exist" unless (-d $src);
$rmtmp = (! -d $mountpoint);
imgsize($bgimg);
readfopts();
mkpath($mountpoint, 0, 0755);
die "Could not create temporary mountpoint $mountpoint: $!\n" unless (-d $mountpoint);
chkrun("sudo hdiutil create -format UDRW $quiet -mode 0777 -volname '".$volname."' -srcfolder '".$src."' '".$tmpdmg."'");
chkrun("sudo hdiutil attach '".$tmpdmg."' -mountpoint '".$mountpoint."' -noautoopen $quiet");
#chkrun("bless --folder '".$mountpoint."' --openfolder '".$mountpoint."'");
if ($bgimg ne '') {
    mkpath("$mountpoint/.bg$$", 0, 0755);
    chkrun('cp "'.$bgimg.'" "'.$mountpoint.'/.bg'.$$.'"');
    $bgimg = basename($bgimg);
}
if ($volicon ne '') {
    chkrun('cp "'.$volicon.'" "'.$mountpoint.'/.VolumeIcon.icns"');
    chkrun($SETFILE.' -a C "'.$mountpoint.'"');
}
my $script=<<SCRIPT;
    tell application "Finder"
        set mountpoint to POSIX file ("$mountpoint" as string) as alias
        tell folder mountpoint
            open
            tell container window
                set toolbar visible to false
                set statusbar visible to false
                set current view to icon view
                set the bounds to {@{[window_bounds]}}
            end tell
            set icon size of the icon view options of container window to $iconsize
            set text size of the icon view options of container window to $textsize
            set arrangement of the icon view options of container window to not arranged
            @{[file_positions]}
            set the bounds of the container window to {@{[window_bounds]}}
            set background picture of the icon view options of container window to file ".bg$$:$bgimg" 
            update without registering applications
            close
        end tell
    end tell
SCRIPT
runscript($script);
file_options();
if ($bgimg ne '') {
    chkrun($SETFILE.' -a V "'.$mountpoint.'/.bg'.$$.'"');
}
chkrun("sudo hdiutil detach $mountpoint $quiet -force");
chkrun("sudo hdiutil convert '".$tmpdmg."' $quiet -format UDZO -imagekey zlib-level=9 -o '".$out."'");