package Brackup::ConfigSection;
use strict;
use warnings;

sub new {
    my ($class, $name) = @_;
    return bless {
        _name      => $name,
        _accessed  => {},  # key => 1
    }, $class;
}

sub name {
    my $self = shift;
    return $self->{_name};
}

sub add {
    my ($self, $key, $val) = @_;
    push @{ $self->{$key} ||= [] }, $val;
}

sub unused_config {
    my $self = shift;
    return sort grep { $_ ne "_name" && $_ ne "_accessed" && ! $self->{_accessed}{$_} } keys %$self;
}

sub path_value {
    my ($self, $key) = @_;
    my $val = $self->value($key) || "";
    die "Path '$key' of '$val' isn't a valid directory\n"
        unless $val && -d $val;
    return $val;
}

sub byte_value {
    my ($self, $key) = @_;
    my $val = $self->value($key);
    return 0                unless $val;
    return $1               if $val =~ /^(\d+)b?$/i;
    return $1 * 1024        if $val =~ /^(\d+)kb?$/i;
    return $1 * 1024 * 1024 if $val =~ /^(\d+)mb?$/i;
    die "Unrecognized size format: '$val'\n";
}

sub value {
    my ($self, $key) = @_;
    $self->{_accessed}{$key} = 1;
    my $vals = $self->{$key};
    return undef unless $vals;
    die "Configuration section '$self->{_name}' has multiple values of key '$key' where only one is expected.\n"
        if @$vals > 1;
    return $vals->[0];
}

sub values {
    my ($self, $key) = @_;
    $self->{_accessed}{$key} = 1;
    my $vals = $self->{$key};
    return () unless $vals;
    return @$vals;
}

1;