#  You may distribute under the terms of either the GNU General Public License
#  or the Artistic License (the same terms as Perl itself)
#
#  (C) Paul Evans, 2010-2024 -- leonerd@leonerd.org.uk

package Net::Async::WebSocket::Client 0.14;

use v5.14;
use warnings;
use base qw( Net::Async::WebSocket::Protocol );

IO::Async::Notifier->VERSION( '0.63' ); # ->adopt_future

use Carp;

BEGIN {
   if( $^V ge v5.40 ) {
      *blessed = \&builtin::blessed;
   }
   else {
      require Scalar::Util;
      *blessed = \&Scalar::Util::blessed;
   }
}

use URI;
use URI::wss;

BEGIN {
   # We also need to support ->resource_name, which the CPAN module does not
   # understand as of 2017-01-01
   no warnings 'once';
   *URI::wss::resource_name = sub {
      shift->path_query
   } unless URI::wss->can( "resource_name" );
}

use Protocol::WebSocket::Handshake::Client;

=head1 NAME

C<Net::Async::WebSocket::Client> - connect to a WebSocket server using
C<IO::Async>

=head1 SYNOPSIS

   use Future::AsyncAwait;

   use IO::Async::Loop;
   use Net::Async::WebSocket::Client;

   my $client = Net::Async::WebSocket::Client->new(
      on_text_frame => sub {
         my ( $self, $frame ) = @_;
         print $frame;
      },
   );

   my $loop = IO::Async::Loop->new;
   $loop->add( $client );

   await $client->connect( url => "ws://$HOST:$PORT/" );

   await $client->send_text_frame( "Hello, world!\n" );

   $loop->run;

=head1 DESCRIPTION

This subclass of L<Net::Async::WebSocket::Protocol> connects to a WebSocket
server to establish a WebSocket connection for passing frames.

=cut

sub new
{
   my $class = shift;
   return $class->SUPER::new(
      masked => 1,
      @_,
   );
}

=head1 METHODS

The following methods documented in an C<await> expression return L<Future>
instances.

=cut

sub _do_handshake
{
   my $self = shift;
   my %params = @_;

   my $hs = Protocol::WebSocket::Handshake::Client->new(
      url => $params{url},
      req => $params{req},
   );

   $self->debug_printf( "HANDSHAKE start" );
   $self->write( $hs->to_string );

   my $f = $self->loop->new_future;
   $self->SUPER::configure( on_read => sub {
      my ( undef, $buffref, $closed ) = @_;

      $hs->parse( $$buffref ); # modifies $$buffref

      if( $hs->is_done ) {
         $self->debug_printf( "HANDSHAKE done" );
         $self->SUPER::configure( on_read => undef );

         $f->done( $self );
      }

      return 0;
   } );

   return $f;
}

=head2 connect

   await $self->connect( %params );

Connect to a WebSocket server. Takes the following named parameters:

=over 8

=item url => STRING

URL to provide to WebSocket handshake. This is also used to infer the host and
service name (port number) if not otherwise supplied.

=item req => Protocol::WebSocket::Request

Optional. If provided, gives the L<Protocol::WebSocket::Request> instance used
for performing the handshake.

=back

The returned L<Future> returns the client instance itself, making it useful
in chaining constructors.

=head2 connect (void)

   $self->connect( %params );

When not returning a C<Future>, the following additional parameters provide
continuations:

=over 8

=item on_connected => CODE

CODE reference to invoke when the handshaking is complete.

=back

=cut

sub connect
{
   my $self = shift;
   my %params = @_;

   if( my $url = $params{url} ) {
      $url = URI->new( $url ) unless blessed $url and $url->isa( "URI" );

      $params{host}    //= $url->host;
      $params{service} //= $url->port;

      if( $url->secure ) {
         require IO::Async::SSL;
         push @{ $params{extensions} }, qw( SSL );
         $params{SSL_hostname} //= $url->host;
      }
   }

   my $on_connected = delete $params{on_connected};

   my $f = $self->SUPER::connect( %params )->then( sub {
      my ( $self ) = @_;

      $self->_do_handshake( %params );
   });

   $f->on_done( $on_connected ) if $on_connected;

   return $f if defined wantarray;

   $self->adopt_future( $f );
}

=head2 connect_handle

   await $client->connect_handle( $handle, %params );

Sets the read and write handles to the IO reference given, then performs the
initial handshake using the parameters given. These are as for C<connect>.

=cut

sub connect_handle
{
   my $self = shift;
   my ( $handle, %params ) = @_;

   $self->set_handle( $handle );

   $self->_do_handshake( %params );
}

=head1 AUTHOR

Paul Evans <leonerd@leonerd.org.uk>

=cut

0x55AA;