use strict;
use warnings;
use Benchmark qw/cmpthese/;
use Test::More tests => 4;

my @DATA = map { int(-100 + rand 200) } 1 ... 1000;
my $g=use_grep(@DATA);
    diag 'grep => ', explain $g;
my $c=use_comparison_ops(@DATA);
    diag 'comparison_ops => ', explain $c;
my $s=use_spaceship_op(@DATA);
    diag 'spaceship_op => ', explain $s;
my $r=use_hiyesthanks_regex(@DATA);
    diag '[hiyesthanks] regex => ', explain $r;
my $m=use_marshall_regex(@DATA);
    diag '[Marshall] regex => ', explain $m;
is_deeply $c, $g, 'verify comparison operators give same results as grep';
is_deeply $s, $g, 'verify spaceship operators give same results as grep';
is_deeply $r, $g, 'verify [hiyesthanks] regex give same results as grep';
is_deeply $m, $g, 'verify [Marshall] regex give same results as grep';
cmpthese( 0, {
    use_grep => sub { use_hiyesthanks_regex(@DATA) },
    use_hiyesthanks_regex => sub { use_hiyesthanks_regex(@DATA) },
    use_marshall_regex => sub { use_marshall_regex(@DATA) },
    use_comparison_ops => sub { use_comparison_ops(@DATA) },
    use_spaceship_op => sub { use_spaceship_op(@DATA) },
});

sub use_hiyesthanks_regex {
    my ( $count_of_positives, $count_of_negatives, $count_of_zeros, $count_of_others ) = ( 0, 0, 0, 0 );
    for my $num ( @_ ) {
        if ( $num =~ /^[0].{0}/ ) {
                $count_of_zeros++;
        }
        elsif ( $num =~ /^\d[0-9]{1,3}$/ ) {
                $count_of_positives++;
        }
        else {
                $count_of_negatives++;
        }
    }
    return {
        count_of_positives  => $count_of_positives,
        count_of_negatives  => $count_of_negatives,
        count_of_zeros      => $count_of_zeros,
        count_of_others     => $count_of_others,
        total_count         => $count_of_positives + $count_of_negatives + $count_of_zeros + $count_of_others,
    };
}

sub use_marshall_regex {
    my ( $count_of_positives, $count_of_negatives, $count_of_zeros, $count_of_others ) = ( 0, 0, 0, 0 );
    for my $num ( @_ ) {
        if ( $num =~ /^0$/ ) {
                $count_of_zeros++;
        }
        elsif ( $num =~ /^\d+$/ ) {
                $count_of_positives++;
        }
        elsif ( $num =~ /^-\d+$/ ) {
                $count_of_negatives++;
        }
        else {
                $count_of_others++;
        }
    }
    return {
        count_of_positives  => $count_of_positives,
        count_of_negatives  => $count_of_negatives,
        count_of_zeros      => $count_of_zeros,
        count_of_others     => $count_of_others,
        total_count         => $count_of_positives + $count_of_negatives + $count_of_zeros + $count_of_others,
    };
}

sub use_comparison_ops {
    my ( $count_of_positives, $count_of_negatives, $count_of_zeros, $count_of_others ) = ( 0, 0, 0, 0 );
    for my $num ( @_ ) {
        if ( $num < 0 ) {
                $count_of_negatives++;
        }
        elsif ( $num > 0 ) {
                $count_of_positives++;
        }
        else {
                $count_of_zeros++;
        }
    }
    return {
        count_of_positives  => $count_of_positives,
        count_of_negatives  => $count_of_negatives,
        count_of_zeros      => $count_of_zeros,
        count_of_others     => $count_of_others,
        total_count         => $count_of_positives + $count_of_negatives + $count_of_zeros + $count_of_others,
    };
}
sub use_spaceship_op {
    my ( $count_of_positives, $count_of_negatives, $count_of_zeros, $count_of_others ) = ( 0, 0, 0, 0 );
    for my $num ( @_ ) {
        for( $num <=> 0 ) {
            $_ == -1 && do {$count_of_negatives++; next;};
            $_ == +1 && do {$count_of_positives++; next;};
            $_ ==  0 && do {$count_of_zeros++; next;};
            $count_of_others++;
        }
    }
    return {
        count_of_positives  => $count_of_positives,
        count_of_negatives  => $count_of_negatives,
        count_of_zeros      => $count_of_zeros,
        count_of_others     => $count_of_others,
        total_count         => $count_of_positives + $count_of_negatives + $count_of_zeros + $count_of_others,
    };
}

sub use_grep {
    my $count_of_positives = scalar grep { $_ >  0 } @_;
    my $count_of_negatives = scalar grep { $_ <  0 } @_;
    my $count_of_zeros     = scalar grep { $_ == 0 } @_;
    my $count_of_others    = scalar(@_) - ($count_of_positives + $count_of_negatives + $count_of_zeros);
    return {
        count_of_positives  => $count_of_positives,
        count_of_negatives  => $count_of_negatives,
        count_of_zeros      => $count_of_zeros,
        count_of_others     => $count_of_others,
        total_count         => $count_of_positives + $count_of_negatives + $count_of_zeros + $count_of_others,
    };
}