##############################################
#
# HomeMatic XMLRPC API Device Provider
# Written by Oliver Wagner <owagner@vapor.com>
#
# V0.1
#
##############################################
#
# This module implements the documented XML-RPC based API
# of the Homematic system software (currently offered as 
# part of the CCU1 and of the LAN config adapter software)
#
# This module operates a http server to receive incoming
# xmlrpc event notifications from the HM software.
#
# Individual devices are then handled by 01_HMDEV.pm
#
package main;

use strict;
use warnings;
use Time::HiRes qw(gettimeofday);
use RPC::XML::Server;
use RPC::XML::Client;
use Dumpvalue;

my $dumper=new Dumpvalue;
$dumper->veryCompact(1);

sub HMRPC_Initialize($)
{
	my ($hash) = @_;

	$hash->{DefFn} = "HMRPC_Define";
	$hash->{ShutdownFn} = "HMRPC_Shutdown";
	$hash->{ReadFn} = "HMRPC_Read";
	$hash->{SetFn} = "HMRPC_Set";
	$hash->{Clients} = ":HMDEV:";
}

#####################################
sub
HMRPC_Shutdown($)
{
	my ($hash) = @_;
	# Uninitialize again
	$hash->{client}->send_request("init",$hash->{callbackurl},"");	
	return undef;
}

#####################################
sub
HMRPC_Define($$)
{
	my ($hash, $def) = @_;
	my @a = split("[ \t][ \t]*", $def);

	if(@a != 4) {
		my $msg = "wrong syntax: define <name> HMRPC remote_host remote_port";
		Log 2, $msg;
		return $msg;
	}

	$hash->{serveraddr}=$a[2];
	$hash->{serverport}=$a[3];
	
	$hash->{client}=RPC::XML::Client->new("http://$a[2]:$a[3]/");
	my $callbackport=5400+$hash->{serverport};
	$hash->{server}=RPC::XML::Server->new(port=>$callbackport);
	if(!ref($hash->{server}))
	{
		# Creating the server failed, perhaps because the port was
		# already in use. Just return the message
		Log 1,"Can't create HMRPC callback server on port $callbackport. Port in use?";
		return $hash->{server};
	}
	
	$hash->{server}->{fhemdef}=$hash;
	
	# Add the XMLRPC methods we do expose
	$hash->{server}->add_method(
		{name=>"event",signature=> ["string string string string int","string string string string double","string string string string boolean"],code=>\&HMRPC_EventCB}
	);
	#
	# Dummy implementation, always return an empty array
	#
	$hash->{server}->add_method(
		{name=>"listDevices",signature=>["array string"],code=>sub{return RPC::XML::array->new()} }
	);
	#
	# TOFIX! We can use this to store device types, autocreate devices and other niceties
	#
	$hash->{server}->add_method(
		{name=>"newDevices",signature=>["array string array"],code=>sub{return RPC::XML::array->new()} }
	);
	
	$hash->{STATE} = "Initialized";
	$hash->{SERVERSOCKET}=$hash->{server}->{__daemon};
	$hash->{FD}=$hash->{SERVERSOCKET}->fileno();
	$hash->{PORT}=$hash->{server}->{__daemon}->sockport();
	
	# This will also register the callback
	HMRPC_CheckCallback($hash);

	$selectlist{"$hash->{serveraddr}.$hash->{serverport}"} = $hash;
	
	#
	# All is well
	#
	return 0;
}

sub
HMRPC_CheckCallback($)
{
	my ($hash) = @_;
	# We recheck the callback every 15 minutes. If we didn't receive anything
	# inbetween, we re-init just to make sure (CCU reboots etc.)
	InternalTimer(gettimeofday()+(15*60), "HMRPC_CheckCallback", $hash, 0);
	if(!$hash->{lastcallbackts})
	{
		HMRPC_RegisterCallback($hash);
		return;
	}
	my $age=int(gettimeofday()-$hash->{lastcallbackts});
	if($age>(15*60))
	{
		Log 5,"HMRPC Last callback received more than $age seconds ago, re-init-ing"; 
		HMRPC_RegisterCallback($hash);
	}
}

sub
HMRPC_RegisterCallback($)
{
	my ($hash) = @_;
	
	#
	# We need to find out our local address. In order to do so,
	# we establish a dummy connection to the remote xmlrpc server
	# and then look at the local socket address assigned to us.
	#
	my $dummysock=IO::Socket::INET->new(PeerAddr=>$hash->{serveraddr},PeerPort=>$hash->{serverport});
	$hash->{callbackurl}="http://".$dummysock->sockhost().":".$hash->{PORT}."/fhemhmrpc";
	$dummysock->close();
	Log(2, "HMRPC callback listening on $hash->{callbackurl}");
	# We need to fork here, as the xmlrpc server will synchronously call us
	if(!fork())
	{
		$hash->{client}->send_request("init",$hash->{callbackurl},"cb");
		Log(2, "HMRPC callback initialized");	
		exit(0);
	}
}

#####################################
sub
HMRPC_EventCB($$$$$)
{
	my ($server,$cb,$devid,$attr,$val)=@_;
	
	Log(5, "Processing event setting $devid->$attr=$val" );
	Dispatch($server->{fhemdef},"HMDEV $devid $attr $val",undef);
	$server->{fhemdef}->{lastcallbackts}=gettimeofday();
}

sub
HMRPC_Read($)
{
	my ($hash) = @_;
	
	#
	# Handle an incoming callback
	#
	my $conn=$hash->{server}->{__daemon}->accept();
	$conn->timeout(3);
	$hash->{server}->process_request($conn);
	$conn->close;
	undef $conn;
}

################################
#
#
sub
HMRPC_Set($@)
{
	my ($hash, @a) = @_;

	#return "invalid set specification @a" if(@a != 4 && @a != 5);
	
	my $cmd=$a[1];
	
	if($cmd eq "req")
	{
		# Send a raw xmlrpc request and return the result in 
		# text form. This is mainly useful for diagnostics.
		shift @a;
		shift @a;
		my $ret=$hash->{client}->simple_request(@a);
		# We convert using Dumpvalue. As this only prints, we need
		# to temporarily redirect STDOUT
		my $res="";
		open(my $temp,"+>",\$res);
		my $oldout=select($temp);
		$dumper->dumpValue($ret);
		close(select($oldout));
		return $res;
	}
	
	my $ret;
	if(@a==5)
	{
		my $paramset={$a[3]=>$a[4]};
		
		$ret=$hash->{client}->simple_request("putParamset",$a[1],$a[2],$paramset);
	}
	else
	{
		$ret=$hash->{client}->simple_request("setValue",$a[1],$a[2],$a[3]);
	}
	
	if($ret)
	{
		return $ret->{faultCode}.": ".$ret->{faultString};		
	}
	else
	{
		return undef;
	}
}

1;