use strict;
use warnings;
use List::Util qw/shuffle/;

my $visitors_db_filename = "visitors.db";
my $residents_db_filename = "residents.db";
my @visitors = ();
my @residents = ();
my $total_nb = $ARGV[0];
my $visitors_nb = $ARGV[0]; #todo : calculer
my $residents_nb = $ARGV[1];
my $output_file_name = $ARGV[2] eq "" ? "out" : $ARGV[2];

open(my $visitors_db_file, $visitors_db_filename) or die "Error : no visitors database found \n";

open(my $residents_db_file, $residents_db_filename) or die "Error : no residents database found \n";

while(my $line = <$visitors_db_file>){
    #chomp($line);
    push(@visitors, $line);
}
while(my $line = <$residents_db_file>){
    #chomp($line);
    push(@residents, $line);
}

die "Database is not big enough for $visitors_nb visitors\n" if @visitors < $visitors_nb;
die "Database is not big enough for $residents_nb residents" if @residents < $residents_nb;

@visitors = shuffle(@visitors);
@residents = shuffle(@residents);

open(my $output_file, '>'.$output_file_name) or die "Error : couldn't create output file.";

for(my $i = 0; $i < )
foreach (@visitors){
    print;
}

close $visitors_db_file;
close $residents_db_file;