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sub _default_dir {
    File::Spec->catdir(_base_dir(), '.aws');
}

sub _default_profile {
    (exists $ENV{AWS_DEFAULT_PROFILE} && $ENV{AWS_DEFAULT_PROFILE})
        ? $ENV{AWS_DEFAULT_PROFILE}
        : $DEFAULT_PROFILE;
}

# This only supports one level of nesting, but it seems AWS config files
# themselves only have but one level
sub _parse {
    my $file = shift;
    my $profile = shift || _default_profile();

    my $hash = {};
    my $nested = {};

    return +{} unless -r $file;

    my $contents;
    {
        local $/  = undef;
        open my $fh, '<', $file;
        $contents = <$fh>;
        close( $fh );
    }

    foreach my $line (split /\n/, $contents) {
        chomp $line;

        $profile = $1 if $line =~ /^\[(?:profile )?([\w]+)\]/;
        my ($indent, $key, $value) = $line =~ /^(\s*)([\w]+)\s*=\s*(.*)/;

        next if !defined $key or $key eq q{};

        if (length $indent) {
            $nested->{$key} = $value;
        }
        else {
            # Reset nested hash
            $nested = {} if keys %{$nested};
            $hash->{$profile}{$key} = ($key and $value) ? $value : $nested;
        }
    }

    return $hash;
}

PROFILE: {
    package AWS::CLI::Config::Profile;

    use 5.008001;
    use strict;
    use warnings;

    sub new {
        my $class = shift;
        my $data = @_ ? @_ > 1 ? { @_ } : shift : {};
        return bless $data, $class;
    }

    sub AUTOLOAD {
        our $AUTOLOAD;
        my $self = shift;

        return if $AUTOLOAD =~ /DESTROY/;
        my $method = $AUTOLOAD;
           $method =~ s/.*:://;

        no strict 'refs';
        *{$AUTOLOAD} = sub {
          return shift->{$method}
        };

        return $self->{$method};
    }
}

1;

__END__

=encoding UTF-8

=head1 NAME

AWS::CLI::Config - Interface to access AWS CLI configs and credentials

=head1 SYNOPSIS

    use AWS::CLI::Config;
    my $aws_access_key_id     = AWS::CLI::Config::access_key_id;
    my $aws_secret_access_key = AWS::CLI::Config::secret_access_key($profile);
    my $aws_session_token     = AWS::CLI::Config::session_token($profile);
    my $region                = AWS::CLI::Config::region($profile);

=head1 DESCRIPTION

B<AWS::CLI::Config> provides an interface to access AWS CLI configuration and
credentials. It fetches its values from the appropriate environment variables,
or a credential or config file in the order described in
L<AWS CLI Documents|http://docs.aws.amazon.com/cli/>.

=head1 SUBROUTINES

=head2 access_key_id (Str)

Fetches $ENV{AWS_ACCESS_KEY_ID} or I<aws_access_key_id> defined in the
credential or config file. You can optionally specify the profile as the
first argument.

=head2 secret_access_key (Str)

Fetches $ENV{AWS_SECRET_ACCESS_KEY} or I<aws_secret_access_key> defined in
the credential or config file. You can optionally specify the profile as
the first argument.

=head2 session_token (Str)