#!/usr/bin/perl

my $INSTALLER_VERS = "/System/Library/PrivateFrameworks/Installation.framework/Versions/A/Resources/Info.plist";
my $SYSTEM_VERS = "/System/Library/CoreServices/SystemVersion.plist";
my $APP = "iMovie";
my $APP_IS_RUNNING = 0;
my $EXIT_VALUE = 0;

DO_CHECKS: {
    ########################################################################################
    # 10.1.5 or higher system must be active
    if(CheckVersion("$SYSTEM_VERS", "10.1.5", "ProductVersion", "<")) {
            $EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 16 );
            last;
    }
    
    ########################################################################################
    # Installer Update is required
    if(CheckVersion("$INSTALLER_VERS", "1.1.2", "CFBundleShortVersionString", "<")) {
            $EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 17 );
            last;
    }
    
    ########################################################################################
    # Block installation on Clamshell iBooks

    my $IOREG = `/usr/sbin/ioreg`;
    
    if (($IOREG =~ /PowerBook2,1/) || ($IOREG =~ /PowerBook2,2/)) {
            $EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 18 );
            last;
    }
    
    ########################################################################################
    # stop if app is running
    my $APP_IS_RUNNING 	= 0;
    my $APP 		= "iMovie";
    my $SWU_IS_RUNNING 	= 0;
    my $SWU 		= "Software Update";
    
    # grep ps and see if we're running.
    open(PSOUT, "/bin/ps -awwx |");
    while( <PSOUT> ) {
        if( /$APP\.app/ ) {
            $APP_IS_RUNNING = 1;
        }
    }
    close(PSOUT);
    
    #if SWU is running, we're not allowed to put up an error.
    open(PSOUT, "/bin/ps -awwx |");
    while( <PSOUT> ) {
        if( /$SWU\.app/ ) {
                $SWU_IS_RUNNING = 1;
        }
    }
    close(PSOUT);
    
    
    if (($APP_IS_RUNNING == 1) && ($SWU_IS_RUNNING != 1)) {
            $EXIT_VALUE = (( 1 << 6 ) | ( 1 << 5 ) | 19);
            last;
    }
}
exit($EXIT_VALUE);

###

sub CheckVersion
{
    my $path            = $_[0];
    my $version         = $_[1];
    my $keyName         = $_[2];
    my $operator        = $_[3];

    if (! -e $path) {
        return 0;
    }

    if (!$operator) {
        $operator = "==";
    }

    my $oldSeperator = $/;
    $/ = \0;

    open( PLIST, "$path") || do {
        return 0;
    };

    $plistData = <PLIST>;
    $plistData =~ /<dict>(.*?)<\/dict>/gis;

    @items = split(/<key>/, $plistData);

    shift @items;
    foreach $item (@items) {
        $item =~ /(.*?)<\/key>.*?<string>(.*?)<\/string>/gis;
        $versiondata{ $1 } = $2;
    }

    close(PLIST);

    $/ = $oldSeperator;

    @theVersionArray = split(/\./, $versiondata{$keyName});
    for ($i = 0; $i < 3; $i++) {
        if(!$theVersionArray[$i]) {
            $theVersionArray[$i] = '0';
        }
    }

    @versionArray = split(/\./, $version);
    
    my $actualVersion;

    for ($i = 0; $i < 3; $i++) {
        if (($theVersionArray[$i] != $versionArray[$i]) or ($i == 2)) {

            $actualVersion = $theVersionArray[$i];
            $version = $versionArray[$i];

            last;
        }
    }

    my $expression = '$actualVersion ' . $operator . ' $version';
    if( eval ($expression) )
    {
        return 1;
    }
    else
    {
        return 0;
    }

}

