#!/usr/bin/perl

#########################################################################################
# Description:  Upgrade HiPi Modules
# Created       Mon Mar 11 20:27:35 2013
# svn id        $Id:$
# Copyright:    Copyright (c) 2013 Mark Dootson
# Licence:      This work is free software; you can redistribute it and/or modify it 
#               under the terms of the GNU General Public License as published by the 
#               Free Software Foundation; either version 3 of the License, or any later 
#               version.
#########################################################################################

use strict;
use warnings;
use LWP::Simple qw( :DEFAULT $ua );
use UNIVERSAL::require;

our $VERSION ='0.33';

our $installer  = 'hipi-install';
our $installurl = qq(http://raspberrypi.znix.com/hipifiles/$installer);
our $versionurl = 'http://raspberrypi.znix.com/hipifiles/latest.txt';
 
our $tmproot    = '/var/tmp/_hipiupgrade';

sub upgrade {
    my $latest = get_latest_version();
    my $installed = get_installed_version();

    if( $latest > $installed ) {
        plog(qq(Installing latest version $latest of HiPi Perl Modules));
        do_install();
    } else {
        plog(qq(Latest version of HiPi Perl Modules is already installed));
    }
    exitclean();
}

sub get_latest_version {
    my $content;
    {
        $ua->env_proxy;
        $ua->timeout(10);    
        $content = get($versionurl);
    }
    if(!defined($content) ) {
        exitclean('The HiPi web site is unavailable or could not be reached.');
    }
    chomp($content);
    return $content;
}

sub get_installed_version {
    my $class = 'HiPi';
    if( $class->require ) {
        return $HiPi::VERSION;
    } else {
        return 0;
    }
}

sub plog { print $_[0] . qq(\n); }

sub do_install {
    qx(rm -rf $tmproot) if -e $tmproot;
    mkdir($tmproot, 0777) or exitclean('could not create temporary install directory');
    chdir($tmproot) or exitclean('could not enter temporary install directory');

    system(qq(wget $installurl)) and exitclean('Failed to download install script');
    
    # As this is an upgrade, don't upgrade Wx if it is not already installed
    my $class = 'Wx::Mini';
    if( $class->require ) {
        system(qq($^X $installer));
    } else {
        system(qq($^X $installer --hipi-wx=0));
    }
}

sub exitclean {
    my( $die ) = @_;
    qx(rm -rf $tmproot) if -e $tmproot;
    if(defined($die)) {
        die $die;
    }
    exit(0);
}

upgrade();

1;