#!/usr/bin/perl
use warnings;
use strict;
use POSIX qw/ceil floor/;

my $len = shift or die "Need a MAX_LENGTH argument\n";

sub split_Slices {
  my ($slice_big,$max_length,$overlap)=@_;
  my @out;

  for my $slice (@$slice_big){
    my ($start, $length, $end, $multiple, $number) = ($slice->{begin}, $slice->{length});

    if($max_length && ($length > $overlap)) {
        $number = ceil(($length-$overlap) / ($max_length-$overlap));
        $multiple = floor($length / $number);
    } else {
        $number = 1;
        $multiple = $length;
    }

    for(my $i=0; $i < $number; $i++) {
      $end = $start + $multiple + $overlap;
      push @out, { begin => $start, end => $end };
      $start += $multiple + 1;
    }
  }

  return \@out;
}

my @stuff;
push @stuff, { begin => $_ * 10, length => 10 } for 0..9;

my $ret = split_Slices(\@stuff, $len, 0);
use Data::Dumper;
print Dumper($ret);