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#!/usr/bin/perl

#
# Example: demonstrate accessing the package cache
#
# Usage: apt-cache PACKAGE
#

use AptPkg::Config '$_config';
use AptPkg::System '$_system';
use AptPkg::Cache;

(my $self = $0) =~ s#.*/##;

# initialise the global config object with the default values and
# setup the $_system object
$_config->init;
$_system = $_config->system;

# suppress cache building messages
$_config->{quiet} = 2;

# set up the cache
my $cache = AptPkg::Cache->new;
my $policy = $cache->policy;

die "Usage: $self PACKAGE ...\n" unless @ARGV;

for my $pack (@ARGV)
{
    my $p = $cache->{$pack};
    unless ($p)
    {
	warn "$self: don't know anything about package `$pack'\n";
	next;
    }

    print "Package: $pack\n";
    for my $field (qw/Section SelectedState InstState CurrentState Flags/)
    {
	print "$field: $p->{$field}\n" if $p->{$field};
    }

    print "CurrentVer: $p->{CurrentVer}{VerStr}\n" if $p->{CurrentVer};
    if (my $c = $policy->candidate($p))
    {
	print "CandidateVer: ", $c->{VerStr}, "\n";
    }

    my $prio = $policy->priority($p);
    my $pin_ver;
    if ($prio and my $v = $policy->match($p))
    {
	$pin_ver = $v->{VerStr};
    }

    if (my $available = $p->{VersionList})
    {
	print "VersionList:\n";
	my $i = 0;
	for my $v (@$available)
	{
	    print "  [$i] $v->{VerStr}";
	    print " (prio $prio)" if $prio and $pin_ver eq $v->{VerStr};
	    print "\n";
	    for my $f (map $_->{File}, @{$v->{FileList}})
	    {
		printf "    * %s (prio %d)\n", $f->{FileName},
		    $policy->priority($f);
	    }

	    for my $field (qw/MultiArch Arch Priority/)
	    {
		print "      $field: $v->{$field}\n" if $v->{$field};
	    }

	    if (my $deps = $v->{DependsList})
	    {
		my $type = '';
		my $delim = '';

		for my $d (@$deps)
		{
		    if ($d->{DepType} ne $type)
		    {
			print "\n" if $type;
			$type = $d->{DepType};
			print "      $type: ";
		    }
		    else
		    {
			print $delim;
		    }

		    $delim = ($d->{CompType} & AptPkg::Dep::Or) ? ' | ' : ', ';
		    print $d->{TargetPkg}{ShortName};
		    print " ($d->{CompTypeDeb} $d->{TargetVer})"
			if $d->{TargetVer};
		}

		print "\n";
	    }

	    if (my $p = $v->{ProvidesList})
	    {
		print '      Provides: ', (join ', ', map $_->{Name}, @$p),
		    "\n";
	    }

	    $i++;
	}
    }

    if (my $revdeps = $p->{RevDependsList})
    {
	print "RevDependsList:";
	my $parent = '';
	my $type = '';

	for my $r (@$revdeps)
	{
	    my $new_parent = "$r->{ParentPkg}{ShortName} $r->{ParentVer}{VerStr}";
	    unless ($new_parent eq $parent)
	    {
		$parent = $new_parent;
		$type = '';
	    }

	    if ($r->{DepType} ne $type)
	    {
		printf "\n  %-30s", $type ? '' : $parent;
		$type = $r->{DepType};
		print "  $type: ";
	    }
	    else
	    {
		print ', ';
	    }

	    print  $r->{TargetPkg}{ShortName};
	    print  " ($r->{CompTypeDeb} $r->{TargetVer})" if $r->{TargetVer};
	}

	print "\n";
    }

    if (my $provides = $p->{ProvidesList})
    {
	print 'ProvidesList: ', (join ', ',
	    map "$_->{OwnerPkg}{ShortName} $_->{OwnerVer}{VerStr}", @$provides),
	    "\n";
    }

    print "\n";
}

1;