#! C:\Perl\bin
#
#

use strict;
use File::Copy;
use File::Compare;

#log file options
my $logFile = 'backuper.log';
my $outputLog = checkLogFile($logFile) or die("Error opening log file -- $@");
my @exclusion_list = ('.', '..', 'My Music', 'New Folder');

my %directories = ( 'D:\Documents and Settings\jukeane\My Documents', 'U:\mydocs',
                    'D:\Documents and Settings\jukeane\Desktop\bin', 'U:\bin');

while ( (my $ldir, my $rdir) = each(%directories) ) {
  chdir $ldir or fatal_error("Couldn't change to $ldir");
  if (! -d $rdir) {
    fatal_error("Couldn't open the remote directory $rdir");
  }
  
  my $remoteFileName;
  my $tmpDirName;
  my $tmpRemDirName;
  
  read_copy($ldir, $rdir);
}


######################
#   SUBROUTINES      #
######################

sub read_copy {
  my $local_dir = $_[0] or fatal_error("No local directory specified. $!");
  my $remote_dir = $_[1] or fatal_error("No remote directory specified. $!");
  
  if (! -d $remote_dir ) {
    mkdir($remote_dir) or fatal_error("Failed to create $remote_dir. $!");
  }

  opendir(DIRHANDLE, $local_dir) || fatal_error("Cannot opendir $local_dir. $!");
    foreach my $name (sort readdir(DIRHANDLE)) {
      if (! -d $name ) {
          my $remoteFileName = $remote_dir . '\\' . $name ;
          my $localFileName =  $local_dir . '\\' . $name;
          
          if (! -d $remote_dir) {
              fatal_error("$remoteFileName doesn't seem to exist? $!");
          }
          
          if (! -d $localFileName) {
              if ( checkBackup($localFileName, $remoteFileName) ) {
                copy("$localFileName", "$remoteFileName") or die qq(Cannot copy "$localFileName" to "$remoteFileName": $!) ;
                logIt("Backed up $localFileName to $remoteFileName");
              }
          }
          elsif ( -d $localFileName && (! check_exclusion($name)) ) {
                  my $tmpDirName = $local_dir . '\\' . $name;
                  my $tmpRemDirName = $remote_dir . '\\' . $name;
                  read_copy($tmpDirName, $tmpRemDirName);
          }
      }
      else {
          if (! check_exclusion($name) ) {
              my $dir1 = $local_dir . '\\' . $name;
              my $dir2 = $remote_dir . '\\' . $name;
              read_copy($dir1, $dir2);
          }
      }
      
    }
  closedir(DIRHANDLE);
}

sub checkBackup {
  my $file1 = $_[0] or fatal_error("Missing first file in checkBackup(). $!");
  my $file2 = $_[1] or fatal_error("Missing second file in checkBackup(). $!");
  #check to see if we should back these files up
  if (compare("$file1","$file2") == 0) {
      return 0;
  }
  else {
      return 1;
  }
}


sub check_exclusion {
  #checks the exclusion list for stuff not to copy
  my $file = $_[0];
  foreach my $item (@exclusion_list) {
    if ($file eq $item) {
      return 1;
    }
  }
  return 0;
}

sub fatal_error {
    #die and log the error
    my $error_message = $_[0];
    $error_message = "Fatal Error:  " . $error_message;
    logIt($error_message);
    die ($error_message . "\n");
}

#####################
#     Logging       #
#####################

sub logIt {
    #logs errors.
  my $message = $_[0];
  my @fullTime = localtime(time());
  my $time = ($fullTime[5] + 1900) . "/" . (addZero($fullTime[4] + 1)) . "/";
  $time .= addZero($fullTime[3]). " " . addZero($fullTime[2]) . ":";
  $time .= addZero($fullTime[1]) . ":" . addZero($fullTime[0]);
  my $logMessage = $time . "> $message \n";
    print $outputLog $logMessage;
}

sub checkLogFile {
    #checks the output files to make sure they're valid
    my $file = $_[0];
    my $openFile;
  my $status = (stat($file))[7];
  if (! $status) { $status = 0;}
    if ( $status != 0) {
        open($openFile, ">>" . $file) or die("Couldn't open log file for appending " . $file);
        return $openFile;
    }
    else {
        open($openFile, ">" . $file) or die("Couldn't create new log file " . $file);
        return $openFile;
  }
}

sub addZero {
  #formats output to double digit
  if (length($_[0]) < 2) {
    return "0" . $_[0];
  }
  else {
    return $_[0];
  }
}