#!/usr/bin/perl -w
use strict;
use warnings;
use Net::SFTP;
use Net::SFTP::Attributes;
unless( @ARGV == 5) {
   print <<END;
Proper Usage:
    perl sync local_path remote path user pass
END
   exit(0);
}
my($local_path, $host, $remote_path, $user, $pass) = @ARGV;

my(%args) = (    'user' => $user,
'password' => $pass
        );
my $sftp = Net::SFTP->new($host, %args) or die "pasta\n";
die "SFTP Connection Failed\n" if $sftp->status;
#read_local_dir("$local_path/");
#print "----\n";
#$sftp->ls("/");
#read_remote_dir($sftp,"$remote_path/");
sync($sftp, $local_path, $remote_path, "");
sub sync {
   my $sftp = shift;
   my $local = shift;
   my $remote = shift;
   my $path = shift;
   my( $loc_file, $loc_dir) = read_local_dir("$local/$path");
   my( $rem_file, $rem_dir) = read_remote_dir($sftp, "$remote/$path");
   while( my($lk,$lv) = each %$loc_file ) {
      my $flag = 0;
      while( my($rk,$rv) = each %$rem_file ) {
     if($lk eq $rk) {
        if($lv > $rv) {
           # put $lk
           $sftp->put("$local/$path/$lk","$remote/$path/$lk");
        } elsif($lv < $rv) {
           # get $rk
           $sftp->get("$remote/$path/$lk", "$local/$path/$lk");
        }
            $flag = 1;
     }
      }
      if( $flag == 0 ) {
         # put $lk
     $sftp->put("$local/$path/$lk","$remote/$path/$lk");
      }
   }
   while( my($rk,$rv) = each %$rem_file ) {
      my $flag = 0;
      while( my($lk,$lv) = each %$loc_file ) {
     if( $lk eq $rk ) {
        $flag = 1;
     }
      }
      if( $flag == 0 ) {
         # get $rk
     $sftp->get("$remote/$path/$rk", "$local/$path/$rk");
      }
   }
   while( my($lk,$lv) = each %$loc_dir ) {
      my $flag = 0;
      next if $lk =~ /^\./;
      while( my($rk,$rv) = each %$rem_dir ) {
     if( $lk eq $rk ) {
        sync( $sftp, $local, $remote, "$path/$lk");
        $flag = 1;
     }
      }
      if( $flag == 0 ) {
         # create dir
     my $att = Net::SFTP::Attributes->new(Stat => [stat "$local/$path/
+$lk"]);
     $sftp->do_mkdir( "$remote/$path/$lk" , $att);
         # sync it
     sync( $sftp, $local, $remote, "$path/$lk" );
      }
   }
   while( my($rk,$rv) = each %$rem_dir ) {
      my $flag = 0;
      next if $rk =~ /^\./;
      while( my($lk,$lv) = each %$loc_dir ) {
     if( $lk eq $rk ) {
        $flag = 1;
     }
      }
      if( $flag == 0 ) {
         # create dir
     mkdir("$local/$path/$rk");
         # sync it
     sync( $sftp, $local, $remote, "$path/$rk" );
      }
   }
}

sub read_local_dir {
   my $path = shift;
   my $file = {};
   my $dir = {};
   my $f;
   opendir DIR, $path or
      die "Failed to open $path: $!\n";
   while($f = readdir DIR) {
      my(@stats) = stat "$path/$f";
      if(-d "$path/$f"){
     $dir->{$f} = $stats[9];
      } else {
     $file->{$f} = $stats[9];
      }
   }
   return ($file, $dir);
}
sub read_remote_dir {
   my $sftp = shift;
   my $path = shift;
   my $file = {};
   my $dir = {};
   $sftp->ls( $path , sub {
      my $ref = shift;
      if( $ref->{'longname'} =~ /^d/ ) {
     $dir->{$ref->{'filename'}} =$ref->{'a'}->mtime(); 
      } else {
     $file->{$ref->{'filename'}} =$ref->{'a'}->mtime(); 
      }
      
   });
   return ($file, $dir);
}
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