use 5.008001;

our $VERSION = '0.037';
package IO::LCDproc;

###############################################################################
package IO::LCDproc::Client;
@IO::LCDproc::Client::ISA = qw(IO::LCDproc);

use Carp;
use Fcntl;
use IO::Socket::INET;

sub new {
	my $proto 		= shift;
	my $class 		= ref($proto) || $proto;
	my %params	 	= @_;
	croak "No name for Client: $!" unless($params{name});
	my $self  		= {};
	$self->{name} 	= $params{name};
	$self->{host}	= $params{host} || "localhost";
	$self->{port}	= $params{port} || "13666";
	$self->{cmd}	= "client_set name {$self->{name}}\n";
	$self->{screen}	= undef;
   bless ($self, $class);
   return $self;
}

sub add {
	my $self = shift;
	$self->{screen} = shift;
	$self->{screen}{client} = $self;
	$self->{screen}{set} = "screen_set $self->{screen}{name} name {$self->{screen}{name}}\n";
	$self->{screen}{set}.= "screen_set $self->{screen}{name} heartbeat $self->{screen}{heartbeat}\n";
}

sub connect {
	my $self = shift;
	$self->{lcd}	= IO::Socket::INET->new(
		Proto => "tcp", PeerAddr => "$self->{host}", PeerPort => "$self->{port}"
	) or croak "Cannot connect to LCDproc port: $!";
	$self->{lcd}->autoflush();
	sleep 1;
}

sub initialize {
	my $self = shift;
	my $fh = $self->{lcd};
	my $msgs;
	print $fh "hello\n";
	$msgs = <$fh>;
	if($msgs =~ /lcd.+wid\s+(\d+)\s+hgt\s+(\d+)\s+cellwid\s+(\d+)\s+cellhgt\s+(\d+)/){
		$self->{width}  = $1;
		$self->{height} = $2;
		$self->{cellwidth} = $3;
		$self->{cellheight} = $4;
	} else {
		croak "No stats reported...: $!";
	}
	fcntl( $fh, F_SETFL, O_NONBLOCK );

	print $fh $self->{cmd};
	print $fh $self->{screen}{cmd};
	print $fh $self->{screen}{set};
	foreach(@{$self->{screen}{widgets}}){
		print $fh $_->{cmd};
	}
}

sub answer {
	my $self = shift;
	my $fh = $self->{lcd};
	my $answ;
        $answ = <$fh>;

	return $answ;
}

sub flushAnswers {
	my $self = shift;
	while ($self->answer()) {}
}


###############################################################################
package IO::LCDproc::Screen;
@IO::LCDproc::Screen::ISA = qw(IO::LCDproc);

use Carp;

sub new {
	my $proto			= shift;
	my $class			= ref($proto) || $proto;
	my %params			= @_;
	croak "No name for Screen: $!" unless($params{name});
	my $self				= {};
	$self->{name}		= $params{name};
	$self->{heartbeat}	= $params{heartbeat} || "on";
	$self->{cmd}		= "screen_add $self->{name}\n";
	$self->{widgets}	= undef;
	bless ($self, $class);
	return $self;
}

sub add {
	my $self = shift;
	foreach (@_){
		push @{$self->{widgets}}, $_;
		$_->{screen}=$self;
		$_->{cmd} = "widget_add $_->{screen}{name} $_->{name} $_->{type}\n";
	}
}

sub set_prio {
	my $self = shift;
	my $prio = shift;
        my $fh = $self->{client}->{lcd};
        print $fh "screen_set $self->{name} -priority $prio\n";
}

###############################################################################
package IO::LCDproc::Widget;
@IO::LCDproc::Client::ISA = qw(IO::LCDproc);

use Carp;
use overload '++' => \&xIncrement;

sub new {
	my $proto		= shift;
	my $class		= ref($proto) || $proto;
	my %params		= @_;
	croak "No name for Widget: $!" unless($params{name});
	my $self		= {};
	$self->{name}	= $params{name};
	$self->{align}	= $params{align} || "left";
	$self->{type}	= $params{type}  || "string";
	$self->{xPos}	= $params{xPos}  || "";
	$self->{yPos}	= $params{yPos}  || "";
	$self->{data}	= $params{data} if( $params{data} );
	bless ($self, $class);
	return $self;
}

sub set {
	my $self = shift;
	my %params = @_;
	$self->{xPos} = $params{xPos} if($params{xPos});
	$self->{yPos} = $params{yPos} if($params{yPos});
	$self->{data} = $params{data} if($params{data});
	$self->{data} = " " x $self->{screen}{client}{width} if(length( $self->{data} ) < 1 );
	my $fh = $self->{screen}->{client}->{lcd};
	print $fh "widget_set $self->{screen}->{name} $self->{name} $self->{xPos} $self->{yPos} {" .
		($self->{align} =~ /center/ ? $self->_center($self->{data}) :
			($self->{align} =~ /right/ ? $self->_right($self->{data}) : $self->{data})
		) . "}\n";
}

sub _center {
	my $self = shift;
	return(" " x (($self->{screen}{client}{width} - length($_[0]))/2) . $_[0]);
}

sub _right {
	my $self = shift;
	return(" " x (($self->{screen}{client}{width} - length($_[0]))) . $_[0]);
}

sub save {
	my $self = shift;
	$self->{saved} = $self->{data};
}

sub restore {
	my $self = shift;
	$self->{data}  = $self->{saved};
	$self->{saved} = "";
	$self->set;
}

sub xIncrement {
	my $self = shift;
	$self->{xPos}++
}

1;

__END__

=head1 NAME

IO::LCDproc - Perl extension to connect to an LCDproc ready display.

=head1 SYNOPSIS

	use IO::LCDproc;

	my $client	= IO::LCDproc::Client->new(name => "MYNAME");
	my $screen	= IO::LCDproc::Screen->new(name => "screen");
	my $title 	= IO::LCDproc::Widget->new(
			name => "date", type => "title"
			);
	my $first	= IO::LCDproc::Widget->new(
			name => "first", align => "center", xPos => 1, yPos => 2
			);
	my $second	= IO::LCDproc::Widget->new(
			name => "second", align => "center", xPos => 1, yPos => 3
			);
	my $third	= IO::LCDproc::Widget->new(
			name => "third", xPos => 1, yPos => 4
			);
	$client->add( $screen );
	$screen->add( $title, $first, $second, $third );
	$client->connect() or die "cannot connect: $!";
	$client->initialize();

	$title->set( data => "This is the title" );
	$first->set( data => "First Line" );
	$second->set( data => "Second line" );
	$third->set( data => "Third Line" );

        $client->flushAnswers();


=head1 DESCRIPTION

Follow the example above. Pretty straight forward. You create a client, assign a screen,
add widgets, and then set the widgets.

=head2 IO::LCDproc::Client

It is the back engine of the module. It generates the connection to a ready listening server.

=head3 METHODS

=over

=item new( name => 'Client_Name' [, host => $MYHOSTNAME] [, port => $MYPORTNUMBER] )

	Constructor. Takes the following possible arguments (arguments must be given in key => value form):
	host, port, and name. name is required.


=item add( I<SCREENREF> )

	Adds the screens that will be attached to this client.

=item connect()

	Establishes connection to LCDproc server (LCDd).

=item initialize()

	Initializes client, screen and all the widgets  with the server.

=item answer()

	Reads an answer from the server

=item flushAnswers()

	Flushes all answers from the server (should be called regulary if you don't need the answers)

=back

=head2 IO::LCDproc::Screen

=head3 METHODS

=over

=item new( name => 'MYNAME')

	Constructor. Allowed options:
	heartbeat => 1 or 0.

=item add( @WIDGETS )

	Adds the given widgets to this screen.

=item set_prio( $prio )

	Sets the screen priority with $prio one of

	hidden		The screen will never be visible 
	background	The screen is only visible when no normal info screens exists 
	info		normal info screen, default priority 
	foreground	an active client 
	alert		The screen has an important message for the user. 
	input		The client is doing interactive input. 

=back

=head2 IO::LCDproc::Widget

=head3 METHODS

=over

=item new( name => 'MYNAME' )

	Constructor. Allowed arguments:
	align (left, center, rigth), type (string, title, vbar, hbar, ...), xPos, yPos, data

=item set()

   Sets the widget to the spec'd args. They may be given on the function call or the may be
   pre specified.
   xPos, yPos, data

=item save()

	Saves current data to be user later.

=item restore()

	Restore previously saved data. (Implicitly calls set)

=back

=head1 SEE ALSO

L<LCDd>

=head1 AUTHOR

Juan C. Muller, E<lt>[email protected]<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2005 by Juan C. Muller

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut