#!/usr/bin/perl

use strict;
use warnings;
use File::Path;
use File::Basename;
use File::Spec;
use File::Copy;
use Cwd;
use Getopt::Long;

# make output unbuffered
$| = 1;

my $path     = getcwd;
my $mtime    = 1;
my $dest;
my $verbose  = '';
my $showhelp = '';
my $result   = GetOptions("source=s"  => \$path,
                           "mtime=i"   => \$mtime,
                           "dest=s"    => \$dest,
                           "help"      => \$showhelp,
                           "verbose"   => \$verbose);

# DEBUG
# print "\$path = $path\n\$mtime = $mtime\n\$dest = $dest\n\$showhelp = $showhelp\n\$verbose = $verbose\n";
# exit(0);

my $usage = "Usage: $0 --dest <destination-path>\n\t" .
             "[--source <source-path> | --mtime <mtime> | --verbose] [--help]\n\t" . 
             "Type $0 --help for more information.";
my $help = <<EOHELP;
$0 - Copy file hierarchies selectively
     based on their modification times

Options:
    -s | --source=SourceDir     Source path. Default: pwd
    -m | --mtime                mtime (see man find). Default: 1
    -d | --dest=DestDir         Destination path. Mandatory option.
    -h | --help                 Print this help screen.
    -v | --verbose              Be more verbose. Default: false
EOHELP

if ($showhelp) {
    print $help;
    exit(0);
}
unless ($dest) {
    die "$usage\n";
}

# remove trailing slash from $dest
$dest =~ s/\/$//;
my $find = "find $path -type f -mtime -$mtime";

my @files = `$find`;
my %dirs_created;
foreach (@files) {
    # debug
    print;
    chomp;
    s/^\.\///;

    my ($filename, $directories, $suffix) = fileparse($_);
    my $new_dir = File::Spec->canonpath(File::Spec->catdir($dest, $directories));
    unless (exists $dirs_created{$new_dir}) {
    	$dirs_created{$new_dir} = mkpath($new_dir);
    	print "Created $new_dir\n" if $verbose;
    }
    
    copy($_, File::Spec->catfile($new_dir, "$filename$suffix"));
    print File::Spec->catfile($new_dir, "$filename$suffix") . "\n" if $verbose;
}

exit(0);