use strict;
use warnings;
use 5.010;

package Net::SIP;
our $VERSION = '0.820';

# this includes nearly everything else
use Net::SIP::Simple ();
use Net::SIP::Simple::Call ();
use List::Util 'first';

# do not include these, because they are only
# used when we do NAT
# use Net::SIP::NATHelper::Base;
# use Net::SIP::NATHelper::Local;
# use Net::SIP::NATHelper::Client;
# use Net::SIP::NATHelper::Server;

use base 'Exporter';
our (@EXPORT_OK, %EXPORT_TAGS);
BEGIN {
    foreach ( qw(
	Net::SIP::Request
	Net::SIP::Response
	Net::SIP::Packet
	Net::SIP::SDP
	Net::SIP::Simple
	Net::SIP::Simple::RTP
	Net::SIP::Dispatcher
	Net::SIP::Dispatcher::Eventloop
	Net::SIP::Redirect
	Net::SIP::Registrar
	Net::SIP::StatelessProxy
	Net::SIP::Blocker
	Net::SIP::ReceiveChain
	Net::SIP::Authorize
	Net::SIP::Endpoint
	Net::SIP::NATHelper::Client
	Net::SIP::NATHelper::Server
	Net::SIP::NATHelper::Local
	Net::SIP::Debug
	Net::SIP::Dropper
	Net::SIP::Leg
	)) {

	my $pkg = $_; # copy from alias
	my $sub;
	if ( $pkg =~m{^Net::SIP::(.*)} ) {
	    ( $sub = $1 ) =~s{::}{_}g;
	} elsif ( $pkg =~m{::(\w+)$} ) {
	    $sub = $1;
	}
	if ( $sub ) {
	    no strict 'refs';
	    *{ $sub } = sub () { $pkg };
	    push @EXPORT_OK,$sub;
	    push @{ $EXPORT_TAGS{alias} },$sub;
	};
    }
}


sub import {
    my $class = shift;
    my @tags = @_;
    while ( my $tag = shift(@tags)) {
	if ( $tag eq ':all' ) {
	    push @tags,':alias',':util',':debug';
	} elsif ( $tag eq ':util' ) {
	    Net::SIP::Util->export_to_level(1,$class,':all')
	} elsif ( $tag eq ':debug' ) {
	    Net::SIP::Debug->export_to_level(1,$class,':DEFAULT')
	} elsif ( $tag eq ':alias' ) {
	    $class->export_to_level(1,$class,$tag);
	} elsif ( $tag =~m{rtp[=:](\d+)-(\d+)}i ) {
	    $Net::SIP::Util::RTP_MIN_PORT = $1;
	    $Net::SIP::Util::RTP_MAX_PORT = $2;
	} elsif ( $tag =~m{^debug[=:](.*)}i ) {
	    Net::SIP::Debug->level($1);
	} elsif ( first { $_ eq $tag } @EXPORT_OK ) {
	    # from the predefined list
	    $class->export_to_level(1,$class,$tag);
	} else {
	    # default try to import from Net::SIP::Util
	    Net::SIP::Util->export_to_level(1,$class,$tag)
	}
    }
}


1;
