#!/usr/bin/env perl

use strict;
use warnings;

use Tie::File;

use constant MAX_HIGH_SCORES_TO_SHOW => 10;

my $high_score_data_file = './pm_high_score.dat';

tie my @high_scores, 'Tie::File', $high_score_data_file or die $!;

while (1) {
    print 'Initials (or Return to end): ';
    chomp (my $initials = <>);
    last unless length $initials;
    my $random_score = 1 + int rand 100;
    print "Random score: $random_score\n";

    print "<<<<<<< Before Adding:\n";
    display_high_scores(\@high_scores, MAX_HIGH_SCORES_TO_SHOW);

    add_high_score(\@high_scores, $random_score, $initials);
    print ">>>>>>> After Adding:\n";
    display_high_scores(\@high_scores, MAX_HIGH_SCORES_TO_SHOW);
}   

untie @high_scores;


sub add_high_score {
    my ($high_scores_ref, $score, $name) = @_;

    my $record = @$high_scores_ref;

    for (0 .. $#$high_scores_ref) {
        if ((split /\s+/, $high_scores_ref->[$_])[0] < $score) {
            $record = $_;
            last;
        }
    }

    splice @$high_scores_ref, $record, 0, join ' ' => $score, $name;

    return;
}

sub display_high_scores {
    my ($high_scores_ref, $max_to_show) = @_;

    $max_to_show = MAX_HIGH_SCORES_TO_SHOW unless defined $max_to_show;
    $max_to_show = @$high_scores_ref if $max_to_show > @$high_scores_ref;

    my $printf_pattern = "%-5d  %s\n";

    print "High Score Table\n";

    for (0 .. $max_to_show - 1) {
        printf $printf_pattern => split /\s+/, $high_scores_ref->[$_], 2;
    }

    return;
}