#!/usr/bin/perl
$folder_IN=$ARGV[0];
$level=0;
$finaltreefile="./final.CSV";
$rootfile=`ls $folder_IN/$level*.CSV`;
print "rootfile: $rootfile\n";
&treebuilder($rootfile);
sub treebuilder{
   $PRESENTLEVELFILE=shift;
   print "File level $level : $PRESENTLEVELFILE\n";
   $level++;
   open(PRESENTLEVELFILE);
    while ($leafline=<PRESENTLEVELFILE>){
    print "Leggo $leafline\n";
    chomp($leafline);
    if ($. == 1){
      if($PRESENTLEVELFILE =~ /^0*/i){
        open(FINAL,">$finaltreefile");
        print FINAL "0 $leafline\n";
        close(FINAL);
      }
      next;
    }else{
    print "next level=$level\n";
    @element=split('§',$leafline);
    chomp($element[0]);
    print "Find $element[0]\n";
    $NEXTLEVELFILE=$folder_IN."/".$level."_".$element[0].".CSV";
    chomp($NEXTLEVELFILE);
    print "Check if file exists: $NEXTLEVELFILE\n";
    if (-e $NEXTLEVELFILE){
      print "$NEXTLEVELFILE !esiste!\n";
      &treebuilder($NEXTLEVELFILE);
      open(FINAL,">>$finaltreefile");
      $level++;
       print FINAL "$level $leafline\n";
       close FINAL;
    }
       print "$NEXTLEVELFILE ?not exists?\n";   
       open(FINAL,">>$finaltreefile");
       print FINAL "$level $leafline\n";
       close FINAL;        
  }
 }  

}