use strict;
use warnings;
use DateTime::Format::Strptime;
# my $Strp = new DateTime::Format::Strptime(pattern     => '%Y-%b-%d %T',);
my $Strp = new DateTime::Format::Strptime(pattern     => '%Y-%b-%d %T', on_error => 'croak');
my $infile = 'ReadLog.txt';
my $outfile = 'ReportLog.txt';
my($fh_out, $fh);
my %lookup;
my $status = 'failed';
my $time_delta = 3600;  # seconds = 1 hour
open($fh_out, '>', $outfile) or die "Could not open outfile: $!";
open($fh, '<', $infile) or die "Could not open logfile: $!";
while (<$fh>) {
    next unless /$status/;
    $_ =~ m/^(.*) UTC.*refs = (\d+)$/;
#    my $dt = $Strp->parse_datetime("$1");
    unless (my $dt = $Strp->parse_datetime($1))
    {
     warn "invalid datetime: $1";
     next;
    }
    my $timestamp = $dt ->epoch();
    my $refs = "$2";
    if ( defined($lookup{$refs}) && $lookup{$refs} + $time_delta <= $timestamp ) {
        print $fh_out "REFS $refs: occurrences at " . $lookup{$refs} . "and $timestamp \n";
        print "REFS $refs: occurrences at " . $lookup{$refs} . " and $timestamp \n";
    }
    $lookup{$refs} = $timestamp;
}
close $fh_out;
#close $fh;