#!/usr/bin/perl

# DO NOT EDIT - This file is being maintained by Chef

use strict;
use warnings;

use Date::Calc qw(Today Add_Delta_Days Add_Delta_YMD Day_of_Week);
use Getopt::Long;

my $days = 0;
my $weeks = 0;
my $months = 0;

GetOptions("days=i" => \$days, "weeks=i" => \$weeks, "months=i" => \$months);

my $dir = shift;
my $prefix = shift;
my @dates;

if ($prefix)
{
    $prefix = "${prefix}-";
}
else
{
    $prefix = "(?:.*-)?";
}

for my $day (0 .. $days - 1)
{
    push(@dates, sprintf("%04d-%02d-%02d", Subtract_Delta_Days(Today(), $day)));
}

for my $week (0 .. $weeks - 1)
{
    push(@dates, sprintf("%04d-%02d-%02d", Subtract_Delta_Days(Monday(), $week * 7)));
}

for my $month (0 .. $months - 1)
{
    push(@dates, sprintf("%04d-%02d-%02d", Subtract_Delta_YMD(First_of_Month(), 0, $month, 0)));
}

my $dates = join("|", @dates);
my $match = qr/^\Q${prefix}\E\d{4}-\d{2}-\d{2}\./;
my $keep = qr/^\Q${prefix}\E(?:${dates})\./;

opendir(DIR, "$dir") || die "Can't open ${dir}: $!";

my @files = sort(grep(/$match/, readdir(DIR)));

closedir(DIR);

pop @files;

for my $file (@files)
{
#    print "Expiring $file\n" if $file !~ $keep;
    unlink("${dir}/${file}") if $file !~ $keep;
}

exit 0;

sub Monday
{
    my @today = Today();

    return Subtract_Delta_Days(@today, Day_of_Week(@today) - 1);
}

sub First_of_Month
{
    my($year,$month,$day) = Today();

    return($year,$month,1);
}

sub Subtract_Delta_Days
{
    my $year = shift;
    my $month = shift;
    my $day = shift;
    my $days = shift;

    return Add_Delta_Days($year, $month, $day, -$days);
}

sub Subtract_Delta_YMD
{
    my $year = shift;
    my $month = shift;
    my $day = shift;
    my $years = shift;
    my $months = shift;
    my $days = shift;

    return Add_Delta_YMD($year, $month, $day, -$years, -$months, -$days);
}